// Constants
const SENSITIVE_INPUT_CLASS = 'sensitive-input';
const ARRAY_ITEM_CLASS = 'array-item';
const ARRAY_INPUT_CLASS = 'array-input';
const MAP_ITEM_CLASS = 'map-item';
const MAP_KEY_INPUT_CLASS = 'map-key-input';
const MAP_VALUE_INPUT_CLASS = 'map-value-input';
const SAFETY_SETTING_ITEM_CLASS = 'safety-setting-item';
const SHOW_CLASS = 'show'; // For modals
const API_KEY_REGEX = /AIzaSy\S{33}/g;
const PROXY_REGEX = /(?:https?|socks5):\/\/(?:[^:@\/]+(?::[^@\/]+)?@)?(?:[^:\/\s]+)(?::\d+)?/g;
const MASKED_VALUE = '••••••••';

// DOM Elements - Global Scope for frequently accessed elements
const safetySettingsContainer = document.getElementById('SAFETY_SETTINGS_container');
const thinkingModelsContainer = document.getElementById('THINKING_MODELS_container');
const apiKeyModal = document.getElementById('apiKeyModal');
const apiKeyBulkInput = document.getElementById('apiKeyBulkInput');
const apiKeySearchInput = document.getElementById('apiKeySearchInput');
const bulkDeleteApiKeyModal = document.getElementById('bulkDeleteApiKeyModal');
const bulkDeleteApiKeyInput = document.getElementById('bulkDeleteApiKeyInput');
const proxyModal = document.getElementById('proxyModal');
const proxyBulkInput = document.getElementById('proxyBulkInput');
const bulkDeleteProxyModal = document.getElementById('bulkDeleteProxyModal');
const bulkDeleteProxyInput = document.getElementById('bulkDeleteProxyInput');
const resetConfirmModal = document.getElementById('resetConfirmModal');
const configForm = document.getElementById('configForm'); // Added for frequent use

// Modal Control Functions
function openModal(modalElement) {
    if (modalElement) {
        modalElement.classList.add(SHOW_CLASS);
    }
}

function closeModal(modalElement) {
    if (modalElement) {
        modalElement.classList.remove(SHOW_CLASS);
    }
}

document.addEventListener('DOMContentLoaded', function() {
    // Initialize configuration
    initConfig();

    // Tab switching
    const tabButtons = document.querySelectorAll('.tab-btn');
    tabButtons.forEach(button => {
        button.addEventListener('click', function(e) {
            e.stopPropagation();
            const tabId = this.getAttribute('data-tab');
            switchTab(tabId);
        });
    });

    // Upload provider switching
    const uploadProviderSelect = document.getElementById('UPLOAD_PROVIDER');
    if (uploadProviderSelect) {
        uploadProviderSelect.addEventListener('change', function() {
            toggleProviderConfig(this.value);
        });
    }

    // Toggle switch events
    const toggleSwitches = document.querySelectorAll('.toggle-switch');
    toggleSwitches.forEach(toggleSwitch => {
        toggleSwitch.addEventListener('click', function(e) {
            e.stopPropagation();
            const checkbox = this.querySelector('input[type="checkbox"]');
            if (checkbox) {
                checkbox.checked = !checkbox.checked;
            }
        });
    });

    // Save button
    const saveBtn = document.getElementById('saveBtn');
    if (saveBtn) {
        saveBtn.addEventListener('click', saveConfig);
    }

    // Reset button
    const resetBtn = document.getElementById('resetBtn');
    if (resetBtn) {
        resetBtn.addEventListener('click', resetConfig); // resetConfig will open the modal
    }

    // Scroll buttons
    window.addEventListener('scroll', toggleScrollButtons);

    // API Key Modal Elements and Events
    const addApiKeyBtn = document.getElementById('addApiKeyBtn');
    const closeApiKeyModalBtn = document.getElementById('closeApiKeyModalBtn');
    const cancelAddApiKeyBtn = document.getElementById('cancelAddApiKeyBtn');
    const confirmAddApiKeyBtn = document.getElementById('confirmAddApiKeyBtn');

    if (addApiKeyBtn) {
        addApiKeyBtn.addEventListener('click', () => {
            openModal(apiKeyModal);
            if (apiKeyBulkInput) apiKeyBulkInput.value = '';
        });
    }
    if (closeApiKeyModalBtn) closeApiKeyModalBtn.addEventListener('click', () => closeModal(apiKeyModal));
    if (cancelAddApiKeyBtn) cancelAddApiKeyBtn.addEventListener('click', () => closeModal(apiKeyModal));
    if (confirmAddApiKeyBtn) confirmAddApiKeyBtn.addEventListener('click', handleBulkAddApiKeys);
    if (apiKeySearchInput) apiKeySearchInput.addEventListener('input', handleApiKeySearch);


    // Bulk Delete API Key Modal Elements and Events
    const bulkDeleteApiKeyBtn = document.getElementById('bulkDeleteApiKeyBtn');
    const closeBulkDeleteModalBtn = document.getElementById('closeBulkDeleteModalBtn');
    const cancelBulkDeleteApiKeyBtn = document.getElementById('cancelBulkDeleteApiKeyBtn');
    const confirmBulkDeleteApiKeyBtn = document.getElementById('confirmBulkDeleteApiKeyBtn');

    if (bulkDeleteApiKeyBtn) {
        bulkDeleteApiKeyBtn.addEventListener('click', () => {
            openModal(bulkDeleteApiKeyModal);
            if (bulkDeleteApiKeyInput) bulkDeleteApiKeyInput.value = '';
        });
    }
    if (closeBulkDeleteModalBtn) closeBulkDeleteModalBtn.addEventListener('click', () => closeModal(bulkDeleteApiKeyModal));
    if (cancelBulkDeleteApiKeyBtn) cancelBulkDeleteApiKeyBtn.addEventListener('click', () => closeModal(bulkDeleteApiKeyModal));
    if (confirmBulkDeleteApiKeyBtn) confirmBulkDeleteApiKeyBtn.addEventListener('click', handleBulkDeleteApiKeys);


    // Proxy Modal Elements and Events
    const addProxyBtn = document.getElementById('addProxyBtn');
    const closeProxyModalBtn = document.getElementById('closeProxyModalBtn');
    const cancelAddProxyBtn = document.getElementById('cancelAddProxyBtn');
    const confirmAddProxyBtn = document.getElementById('confirmAddProxyBtn');

    if (addProxyBtn) {
        addProxyBtn.addEventListener('click', () => {
            openModal(proxyModal);
            if (proxyBulkInput) proxyBulkInput.value = '';
        });
    }
    if (closeProxyModalBtn) closeProxyModalBtn.addEventListener('click', () => closeModal(proxyModal));
    if (cancelAddProxyBtn) cancelAddProxyBtn.addEventListener('click', () => closeModal(proxyModal));
    if (confirmAddProxyBtn) confirmAddProxyBtn.addEventListener('click', handleBulkAddProxies);


    // Bulk Delete Proxy Modal Elements and Events
    const bulkDeleteProxyBtn = document.getElementById('bulkDeleteProxyBtn');
    const closeBulkDeleteProxyModalBtn = document.getElementById('closeBulkDeleteProxyModalBtn');
    const cancelBulkDeleteProxyBtn = document.getElementById('cancelBulkDeleteProxyBtn');
    const confirmBulkDeleteProxyBtn = document.getElementById('confirmBulkDeleteProxyBtn');

    if (bulkDeleteProxyBtn) {
        bulkDeleteProxyBtn.addEventListener('click', () => {
            openModal(bulkDeleteProxyModal);
            if (bulkDeleteProxyInput) bulkDeleteProxyInput.value = '';
        });
    }
    if (closeBulkDeleteProxyModalBtn) closeBulkDeleteProxyModalBtn.addEventListener('click', () => closeModal(bulkDeleteProxyModal));
    if (cancelBulkDeleteProxyBtn) cancelBulkDeleteProxyBtn.addEventListener('click', () => closeModal(bulkDeleteProxyModal));
    if (confirmBulkDeleteProxyBtn) confirmBulkDeleteProxyBtn.addEventListener('click', handleBulkDeleteProxies);


    // Reset Confirmation Modal Elements and Events
    const closeResetModalBtn = document.getElementById('closeResetModalBtn');
    const cancelResetBtn = document.getElementById('cancelResetBtn');
    const confirmResetBtn = document.getElementById('confirmResetBtn');

    if (closeResetModalBtn) closeResetModalBtn.addEventListener('click', () => closeModal(resetConfirmModal));
    if (cancelResetBtn) cancelResetBtn.addEventListener('click', () => closeModal(resetConfirmModal));
    if (confirmResetBtn) {
        confirmResetBtn.addEventListener('click', () => {
            closeModal(resetConfirmModal);
            executeReset();
        });
    }

    // Click outside modal to close
    window.addEventListener('click', (event) => {
        const modals = [apiKeyModal, resetConfirmModal, bulkDeleteApiKeyModal, proxyModal, bulkDeleteProxyModal];
        modals.forEach(modal => {
            if (event.target === modal) {
                closeModal(modal);
            }
        });
    });

    // Removed static token generation button event listener, now handled dynamically if needed or by specific buttons.

    // Authentication token generation button
    const generateAuthTokenBtn = document.getElementById('generateAuthTokenBtn');
    const authTokenInput = document.getElementById('AUTH_TOKEN');
    if (generateAuthTokenBtn && authTokenInput) {
        generateAuthTokenBtn.addEventListener('click', function() {
            const newToken = generateRandomToken(); // Assuming generateRandomToken is defined elsewhere
            authTokenInput.value = newToken;
            if (authTokenInput.classList.contains(SENSITIVE_INPUT_CLASS)) {
                const event = new Event('focusout', { bubbles: true, cancelable: true });
                authTokenInput.dispatchEvent(event);
            }
            showNotification('已生成新认证令牌', 'success');
        });
    }

    // Event delegation for THINKING_MODELS input changes to update budget map keys
    if (thinkingModelsContainer) {
        thinkingModelsContainer.addEventListener('input', function(event) {
            const target = event.target;
            if (target && target.classList.contains(ARRAY_INPUT_CLASS) && target.closest(`.${ARRAY_ITEM_CLASS}[data-model-id]`)) {
                const modelInput = target;
                const modelItem = modelInput.closest(`.${ARRAY_ITEM_CLASS}`);
                const modelId = modelItem.getAttribute('data-model-id');
                const budgetKeyInput = document.querySelector(`.${MAP_KEY_INPUT_CLASS}[data-model-id="${modelId}"]`);
                if (budgetKeyInput) {
                    budgetKeyInput.value = modelInput.value;
                }
            }
        });
    }
    
    // Event delegation for dynamically added remove buttons and generate token buttons within array items
    if(configForm) { // Ensure configForm exists before adding event listener
        configForm.addEventListener('click', function(event) {
            const target = event.target;
            const removeButton = target.closest('.remove-btn');
            const generateButton = target.closest('.generate-btn');

            if (removeButton && removeButton.closest(`.${ARRAY_ITEM_CLASS}`)) {
                const arrayItem = removeButton.closest(`.${ARRAY_ITEM_CLASS}`);
                const parentContainer = arrayItem.parentElement;
                const isThinkingModelItem = arrayItem.hasAttribute('data-model-id') && parentContainer && parentContainer.id === 'THINKING_MODELS_container';
                const isSafetySettingItem = arrayItem.classList.contains(SAFETY_SETTING_ITEM_CLASS);

                if (isThinkingModelItem) {
                    const modelId = arrayItem.getAttribute('data-model-id');
                    const budgetMapItem = document.querySelector(`.${MAP_ITEM_CLASS}[data-model-id="${modelId}"]`);
                    if (budgetMapItem) {
                        budgetMapItem.remove();
                    }
                    // Check and add placeholder for budget map if empty
                    const budgetContainer = document.getElementById('THINKING_BUDGET_MAP_container');
                    if (budgetContainer && budgetContainer.children.length === 0) {
                        budgetContainer.innerHTML = '<div class="text-gray-500 text-sm italic">请在上方添加思考模型，预算将自动关联。</div>';
                    }
                }
                arrayItem.remove();
                // Check and add placeholder for safety settings if empty
                if (isSafetySettingItem && parentContainer && parentContainer.children.length === 0) {
                     parentContainer.innerHTML = '<div class="text-gray-500 text-sm italic">定义模型的安全过滤阈值。</div>';
                }
            } else if (generateButton && generateButton.closest(`.${ARRAY_ITEM_CLASS}`)) {
                const inputField = generateButton.closest(`.${ARRAY_ITEM_CLASS}`).querySelector(`.${ARRAY_INPUT_CLASS}`);
                if (inputField) {
                    const newToken = generateRandomToken();
                    inputField.value = newToken;
                    if (inputField.classList.contains(SENSITIVE_INPUT_CLASS)) {
                        const event = new Event('focusout', { bubbles: true, cancelable: true });
                        inputField.dispatchEvent(event);
                    }
                    showNotification('已生成新令牌', 'success');
                }
            }
        });
    }


    // Add Safety Setting button
    const addSafetySettingBtn = document.getElementById('addSafetySettingBtn');
    if (addSafetySettingBtn) {
        addSafetySettingBtn.addEventListener('click', () => addSafetySettingItem());
    }

    initializeSensitiveFields(); // Initialize sensitive field handling
}); // <-- DOMContentLoaded end

/**
 * Initializes sensitive input field behavior (masking/unmasking).
 */
function initializeSensitiveFields() {
    if (!configForm) return;

    // Helper function: Mask field
    function maskField(field) {
        if (field.value && field.value !== MASKED_VALUE) {
            field.setAttribute('data-real-value', field.value);
            field.value = MASKED_VALUE;
        } else if (!field.value) { // If field value is empty string
            field.removeAttribute('data-real-value');
            // Ensure empty value doesn't show as asterisks
            if (field.value === MASKED_VALUE) field.value = '';
        }
    }

    // Helper function: Unmask field
    function unmaskField(field) {
        if (field.hasAttribute('data-real-value')) {
            field.value = field.getAttribute('data-real-value');
        }
        // If no data-real-value and value is MASKED_VALUE, it might be an initial empty sensitive field, clear it
        else if (field.value === MASKED_VALUE && !field.hasAttribute('data-real-value')) {
            field.value = '';
        }
    }
    
    // Initial masking for existing sensitive fields on page load
    // This function is called after populateForm and after dynamic element additions (via event delegation)
    function initialMaskAllExisting() {
        const sensitiveFields = configForm.querySelectorAll(`.${SENSITIVE_INPUT_CLASS}`);
        sensitiveFields.forEach(field => {
            if (field.type === 'password') {
                // For password fields, browser handles it. We just ensure data-original-type is set
                // and if it has a value, we also store data-real-value so it can be shown when switched to text
                if (field.value) {
                    field.setAttribute('data-real-value', field.value);
                }
                // No need to set to MASKED_VALUE as browser handles it.
            } else if (field.type === 'text' || field.tagName.toLowerCase() === 'textarea') {
                maskField(field);
            }
        });
    }
    initialMaskAllExisting();


    // Event delegation for dynamic and static fields
    configForm.addEventListener('focusin', function(event) {
        const target = event.target;
        if (target.classList.contains(SENSITIVE_INPUT_CLASS)) {
            if (target.type === 'password') {
                // Record original type to switch back on blur
                if (!target.hasAttribute('data-original-type')) {
                    target.setAttribute('data-original-type', 'password');
                }
                target.type = 'text'; // Switch to text type to show content
                // If data-real-value exists (e.g., set during populateForm), use it
                if (target.hasAttribute('data-real-value')) {
                    target.value = target.getAttribute('data-real-value');
                }
                // Otherwise, the browser's existing password value will be shown directly
            } else { // For type="text" or textarea
                unmaskField(target);
            }
        }
    });

    configForm.addEventListener('focusout', function(event) {
        const target = event.target;
        if (target.classList.contains(SENSITIVE_INPUT_CLASS)) {
            // First, if the field is currently text and has a value, update data-real-value
            if (target.type === 'text' || target.tagName.toLowerCase() === 'textarea') {
                if (target.value && target.value !== MASKED_VALUE) {
                    target.setAttribute('data-real-value', target.value);
                } else if (!target.value) { // If value is empty, remove data-real-value
                    target.removeAttribute('data-real-value');
                }
            }

            // Then handle type switching and masking
            if (target.getAttribute('data-original-type') === 'password' && target.type === 'text') {
                target.type = 'password'; // Switch back to password type
                // For password type, browser handles masking automatically, no need to set MASKED_VALUE manually
                // data-real-value has already been updated by the logic above
            } else if (target.type === 'text' || target.tagName.toLowerCase() === 'textarea') {
                // For text or textarea sensitive fields, perform masking
                maskField(target);
            }
        }
    });
}

/**
 * Generates a UUID.
 * @returns {string} A new UUID.
 */
function generateUUID() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

/**
 * Initializes the configuration by fetching it from the server and populating the form.
 */
async function initConfig() {
    try {
        showNotification('正在加载配置...', 'info');
        const response = await fetch('/api/config');

        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }

        const config = await response.json();

        // 确保数组字段有默认值
        if (!config.API_KEYS || !Array.isArray(config.API_KEYS) || config.API_KEYS.length === 0) {
            config.API_KEYS = ['请在此处输入 API 密钥'];
        }

        if (!config.ALLOWED_TOKENS || !Array.isArray(config.ALLOWED_TOKENS) || config.ALLOWED_TOKENS.length === 0) {
            config.ALLOWED_TOKENS = [''];
        }

        if (!config.IMAGE_MODELS || !Array.isArray(config.IMAGE_MODELS) || config.IMAGE_MODELS.length === 0) {
            config.IMAGE_MODELS = ['gemini-1.5-pro-latest'];
        }

        if (!config.SEARCH_MODELS || !Array.isArray(config.SEARCH_MODELS) || config.SEARCH_MODELS.length === 0) {
            config.SEARCH_MODELS = ['gemini-1.5-flash-latest'];
        }

        if (!config.FILTERED_MODELS || !Array.isArray(config.FILTERED_MODELS) || config.FILTERED_MODELS.length === 0) {
            config.FILTERED_MODELS = ['gemini-1.0-pro-latest'];
        }
        // --- 新增：处理 PROXIES 默认值 ---
        if (!config.PROXIES || !Array.isArray(config.PROXIES)) {
            config.PROXIES = []; // 默认为空数组
        }
        // --- 新增：处理新字段的默认值 ---
        if (!config.THINKING_MODELS || !Array.isArray(config.THINKING_MODELS)) {
            config.THINKING_MODELS = []; // 默认为空数组
        }
        if (!config.THINKING_BUDGET_MAP || typeof config.THINKING_BUDGET_MAP !== 'object' || config.THINKING_BUDGET_MAP === null) {
            config.THINKING_BUDGET_MAP = {}; // 默认为空对象
        }
        // --- 新增：处理 SAFETY_SETTINGS 默认值 ---
        if (!config.SAFETY_SETTINGS || !Array.isArray(config.SAFETY_SETTINGS)) {
            config.SAFETY_SETTINGS = []; // 默认为空数组
        }
        // --- 结束：处理 SAFETY_SETTINGS 默认值 ---

        populateForm(config);
        // After populateForm, initialize masking for all populated sensitive fields
        if (configForm) { // Ensure form exists
             initializeSensitiveFields(); // Call initializeSensitiveFields to handle initial masking
        }

        // Ensure upload provider has a default value
        const uploadProvider = document.getElementById('UPLOAD_PROVIDER');
        if (uploadProvider && !uploadProvider.value) {
            uploadProvider.value = 'smms'; // 设置默认值为 smms
            toggleProviderConfig('smms');
        }

        showNotification('配置加载成功', 'success');
    } catch (error) {
        console.error('加载配置失败:', error);
        showNotification('加载配置失败: ' + error.message, 'error');

        // 加载失败时，使用默认配置
        const defaultConfig = {
            API_KEYS: [''],
            ALLOWED_TOKENS: [''],
            IMAGE_MODELS: ['gemini-1.5-pro-latest'],
            SEARCH_MODELS: ['gemini-1.5-flash-latest'],
            FILTERED_MODELS: ['gemini-1.0-pro-latest'],
            UPLOAD_PROVIDER: 'smms',
            PROXIES: [], // 添加默认值
            THINKING_MODELS: [],
            THINKING_BUDGET_MAP: {}
        };

        populateForm(defaultConfig);
        if (configForm) { // Ensure form exists
            initializeSensitiveFields(); // Call initializeSensitiveFields to handle initial masking
        }
        toggleProviderConfig('smms');
    }
}

/**
 * Populates the configuration form with data.
 * @param {object} config - The configuration object.
 */
function populateForm(config) {
    const modelIdMap = {}; // modelName -> modelId

    // 1. Clear existing dynamic content first
    const arrayContainers = document.querySelectorAll('.array-container');
    arrayContainers.forEach(container => {
        container.innerHTML = ''; // Clear all array containers
    });
    const budgetMapContainer = document.getElementById('THINKING_BUDGET_MAP_container');
    if (budgetMapContainer) {
        budgetMapContainer.innerHTML = ''; // Clear budget map container
    } else {
        console.error("Critical: THINKING_BUDGET_MAP_container not found!");
        return; // Cannot proceed
    }

    // 2. Populate THINKING_MODELS and build the map
    if (Array.isArray(config.THINKING_MODELS)) {
        const container = document.getElementById('THINKING_MODELS_container');
        if (container) {
            config.THINKING_MODELS.forEach(modelName => {
                if (modelName && typeof modelName === 'string' && modelName.trim()) {
                    const trimmedModelName = modelName.trim();
                    const modelId = addArrayItemWithValue('THINKING_MODELS', trimmedModelName);
                    if (modelId) {
                        modelIdMap[trimmedModelName] = modelId;
                    } else {
                         console.warn(`Failed to get modelId for THINKING_MODEL: '${trimmedModelName}'`);
                    }
                } else {
                     console.warn(`Invalid THINKING_MODEL entry found:`, modelName);
                }
            });
        } else {
             console.error("Critical: THINKING_MODELS_container not found!");
        }
    }

    // 3. Populate THINKING_BUDGET_MAP using the map
    let budgetItemsAdded = false;
    if (config.THINKING_BUDGET_MAP && typeof config.THINKING_BUDGET_MAP === 'object') {
        for (const [modelName, budgetValue] of Object.entries(config.THINKING_BUDGET_MAP)) {
             if (modelName && typeof modelName === 'string') {
                const trimmedModelName = modelName.trim();
                const modelId = modelIdMap[trimmedModelName]; // Look up the ID
                if (modelId) {
                    createAndAppendBudgetMapItem(trimmedModelName, budgetValue, modelId);
                    budgetItemsAdded = true;
                } else {
                    console.warn(`Budget map: Could not find model ID for '${trimmedModelName}'. Skipping budget item.`);
                }
            } else {
                 console.warn(`Invalid key found in THINKING_BUDGET_MAP:`, modelName);
            }
        }
    }
    if (!budgetItemsAdded && budgetMapContainer) {
         budgetMapContainer.innerHTML = '<div class="text-gray-500 text-sm italic">请在上方添加思考模型，预算将自动关联。</div>';
    }

    // 4. Populate other array fields (excluding THINKING_MODELS)
    for (const [key, value] of Object.entries(config)) {
        if (Array.isArray(value) && key !== 'THINKING_MODELS') {
            const container = document.getElementById(`${key}_container`);
            if (container) {
                value.forEach(itemValue => {
                    if (typeof itemValue === 'string') {
                         addArrayItemWithValue(key, itemValue);
                    } else {
                         console.warn(`Invalid item found in array '${key}':`, itemValue);
                    }
                });
            }
        }
    }

    // 5. Populate non-array/non-budget fields
     for (const [key, value] of Object.entries(config)) {
        if (!Array.isArray(value) && !(typeof value === 'object' && value !== null && key === 'THINKING_BUDGET_MAP')) {
            const element = document.getElementById(key);
            if (element) {
                if (element.type === 'checkbox' && typeof value === 'boolean') {
                    element.checked = value;
                } else if (element.type !== 'checkbox') {
                    if (key === 'LOG_LEVEL' && typeof value === 'string') {
                        element.value = value.toUpperCase();
                    } else {
                        element.value = (value !== null && value !== undefined) ? value : '';
                    }
                }
            }
        }
    }

    // 6. Initialize upload provider
    const uploadProvider = document.getElementById('UPLOAD_PROVIDER');
    if (uploadProvider) {
        toggleProviderConfig(uploadProvider.value);
    }

    // Populate SAFETY_SETTINGS
    let safetyItemsAdded = false;
    if (safetySettingsContainer && Array.isArray(config.SAFETY_SETTINGS)) {
        config.SAFETY_SETTINGS.forEach(setting => {
            if (setting && typeof setting === 'object' && setting.category && setting.threshold) {
                addSafetySettingItem(setting.category, setting.threshold);
                safetyItemsAdded = true;
            } else {
                console.warn("Invalid safety setting item found:", setting);
            }
        });
    }
    if (safetySettingsContainer && !safetyItemsAdded) {
         safetySettingsContainer.innerHTML = '<div class="text-gray-500 text-sm italic">定义模型的安全过滤阈值。</div>';
    }
}

/**
 * Handles the bulk addition of API keys from the modal input.
 */
function handleBulkAddApiKeys() {
    const apiKeyContainer = document.getElementById('API_KEYS_container');
    if (!apiKeyBulkInput || !apiKeyContainer || !apiKeyModal) return;

    const bulkText = apiKeyBulkInput.value;
    const extractedKeys = bulkText.match(API_KEY_REGEX) || [];

    const currentKeyInputs = apiKeyContainer.querySelectorAll(`.${ARRAY_INPUT_CLASS}.${SENSITIVE_INPUT_CLASS}`);
    let currentKeys = Array.from(currentKeyInputs).map(input => {
        return input.hasAttribute('data-real-value') ? input.getAttribute('data-real-value') : input.value;
    }).filter(key => key && key.trim() !== '' && key !== MASKED_VALUE);

    const combinedKeys = new Set([...currentKeys, ...extractedKeys]);
    const uniqueKeys = Array.from(combinedKeys);

    apiKeyContainer.innerHTML = ''; // Clear existing items more directly

    uniqueKeys.forEach(key => {
        addArrayItemWithValue('API_KEYS', key);
    });
    
    const newKeyInputs = apiKeyContainer.querySelectorAll(`.${ARRAY_INPUT_CLASS}.${SENSITIVE_INPUT_CLASS}`);
    newKeyInputs.forEach(input => {
        if (configForm && typeof initializeSensitiveFields === 'function') {
            const focusoutEvent = new Event('focusout', { bubbles: true, cancelable: true });
            input.dispatchEvent(focusoutEvent);
        }
    });

    closeModal(apiKeyModal);
    showNotification(`添加/更新了 ${uniqueKeys.length} 个唯一密钥`, 'success');
}

/**
 * Handles searching/filtering of API keys in the list.
 */
function handleApiKeySearch() {
    const apiKeyContainer = document.getElementById('API_KEYS_container');
    if (!apiKeySearchInput || !apiKeyContainer) return;

    const searchTerm = apiKeySearchInput.value.toLowerCase();
    const keyItems = apiKeyContainer.querySelectorAll(`.${ARRAY_ITEM_CLASS}`);

    keyItems.forEach(item => {
        const input = item.querySelector(`.${ARRAY_INPUT_CLASS}.${SENSITIVE_INPUT_CLASS}`);
        if (input) {
            const realValue = input.hasAttribute('data-real-value') ? input.getAttribute('data-real-value').toLowerCase() : input.value.toLowerCase();
            item.style.display = realValue.includes(searchTerm) ? 'flex' : 'none';
        }
    });
}

/**
 * Handles the bulk deletion of API keys based on input from the modal.
 */
function handleBulkDeleteApiKeys() {
    const apiKeyContainer = document.getElementById('API_KEYS_container');
    if (!bulkDeleteApiKeyInput || !apiKeyContainer || !bulkDeleteApiKeyModal) return;

    const bulkText = bulkDeleteApiKeyInput.value;
    if (!bulkText.trim()) {
        showNotification('请粘贴需要删除的 API 密钥', 'warning');
        return;
    }

    const keysToDelete = new Set(bulkText.match(API_KEY_REGEX) || []);

    if (keysToDelete.size === 0) {
        showNotification('未在输入内容中提取到有效的 API 密钥格式', 'warning');
        return;
    }

    const keyItems = apiKeyContainer.querySelectorAll(`.${ARRAY_ITEM_CLASS}`);
    let deleteCount = 0;

    keyItems.forEach(item => {
        const input = item.querySelector(`.${ARRAY_INPUT_CLASS}.${SENSITIVE_INPUT_CLASS}`);
        const realValue = input && (input.hasAttribute('data-real-value') ? input.getAttribute('data-real-value') : input.value);
        if (realValue && keysToDelete.has(realValue)) {
            item.remove();
            deleteCount++;
        }
    });

    closeModal(bulkDeleteApiKeyModal);

    if (deleteCount > 0) {
        showNotification(`成功删除了 ${deleteCount} 个匹配的密钥`, 'success');
    } else {
        showNotification('列表中未找到您输入的任何密钥进行删除', 'info');
    }
    bulkDeleteApiKeyInput.value = '';
}

/**
 * Handles the bulk addition of proxies from the modal input.
 */
function handleBulkAddProxies() {
    const proxyContainer = document.getElementById('PROXIES_container');
    if (!proxyBulkInput || !proxyContainer || !proxyModal) return;

    const bulkText = proxyBulkInput.value;
    const extractedProxies = bulkText.match(PROXY_REGEX) || [];

    const currentProxyInputs = proxyContainer.querySelectorAll(`.${ARRAY_INPUT_CLASS}`);
    const currentProxies = Array.from(currentProxyInputs).map(input => input.value).filter(proxy => proxy.trim() !== '');

    const combinedProxies = new Set([...currentProxies, ...extractedProxies]);
    const uniqueProxies = Array.from(combinedProxies);

    proxyContainer.innerHTML = ''; // Clear existing items

    uniqueProxies.forEach(proxy => {
        addArrayItemWithValue('PROXIES', proxy);
    });

    closeModal(proxyModal);
    showNotification(`添加/更新了 ${uniqueProxies.length} 个唯一代理`, 'success');
}

/**
 * Handles the bulk deletion of proxies based on input from the modal.
 */
function handleBulkDeleteProxies() {
    const proxyContainer = document.getElementById('PROXIES_container');
    if (!bulkDeleteProxyInput || !proxyContainer || !bulkDeleteProxyModal) return;

    const bulkText = bulkDeleteProxyInput.value;
    if (!bulkText.trim()) {
        showNotification('请粘贴需要删除的代理地址', 'warning');
        return;
    }

    const proxiesToDelete = new Set(bulkText.match(PROXY_REGEX) || []);

    if (proxiesToDelete.size === 0) {
        showNotification('未在输入内容中提取到有效的代理地址格式', 'warning');
        return;
    }

    const proxyItems = proxyContainer.querySelectorAll(`.${ARRAY_ITEM_CLASS}`);
    let deleteCount = 0;

    proxyItems.forEach(item => {
        const input = item.querySelector(`.${ARRAY_INPUT_CLASS}`);
        if (input && proxiesToDelete.has(input.value)) {
            item.remove();
            deleteCount++;
        }
    });

    closeModal(bulkDeleteProxyModal);

    if (deleteCount > 0) {
        showNotification(`成功删除了 ${deleteCount} 个匹配的代理`, 'success');
    } else {
        showNotification('列表中未找到您输入的任何代理进行删除', 'info');
    }
    bulkDeleteProxyInput.value = '';
}

/**
 * Switches the active configuration tab.
 * @param {string} tabId - The ID of the tab to switch to.
 */
function switchTab(tabId) {
    // 更新标签按钮状态
    const tabButtons = document.querySelectorAll('.tab-btn');
    tabButtons.forEach(button => {
        if (button.getAttribute('data-tab') === tabId) {
            // 激活状态：主色背景，白色文字，添加阴影
            button.classList.remove('bg-white', 'bg-opacity-50', 'text-gray-700', 'hover:bg-opacity-70');
            button.classList.add('bg-primary-600', 'text-white', 'shadow-md');
        } else {
            // 非激活状态：白色背景，灰色文字，无阴影
            button.classList.remove('bg-primary-600', 'text-white', 'shadow-md');
            button.classList.add('bg-white', 'bg-opacity-50', 'text-gray-700', 'hover:bg-opacity-70');
        }
    });

    // 更新内容区域
    const sections = document.querySelectorAll('.config-section');
    sections.forEach(section => {
        if (section.id === `${tabId}-section`) {
            section.classList.add('active');
        } else {
            section.classList.remove('active');
        }
    });
}

/**
 * Toggles the visibility of configuration sections for different upload providers.
 * @param {string} provider - The selected upload provider.
 */
function toggleProviderConfig(provider) {
    const providerConfigs = document.querySelectorAll('.provider-config');
    providerConfigs.forEach(config => {
        if (config.getAttribute('data-provider') === provider) {
            config.classList.add('active');
        } else {
            config.classList.remove('active');
        }
    });
}

/**
 * Creates and appends an input field for an array item.
 * @param {string} key - The configuration key for the array.
 * @param {string} value - The initial value for the input field.
 * @param {boolean} isSensitive - Whether the input is for sensitive data.
 * @param {string|null} modelId - Optional model ID for thinking models.
 * @returns {HTMLInputElement} The created input element.
 */
function createArrayInput(key, value, isSensitive, modelId = null) {
    const input = document.createElement('input');
    input.type = 'text';
    input.name = `${key}[]`; // Used for form submission if not handled by JS
    input.value = value;
    let inputClasses = `${ARRAY_INPUT_CLASS} flex-grow px-3 py-2 border-none rounded-l-md focus:outline-none`;
    if (isSensitive) {
        inputClasses += ` ${SENSITIVE_INPUT_CLASS}`;
    }
    input.className = inputClasses;
    if (modelId) {
        input.setAttribute('data-model-id', modelId);
        input.placeholder = '思考模型名称';
    }
    return input;
}

/**
 * Creates a generate token button for allowed tokens.
 * @returns {HTMLButtonElement} The created button element.
 */
function createGenerateTokenButton() {
    const generateBtn = document.createElement('button');
    generateBtn.type = 'button';
    generateBtn.className = 'generate-btn px-2 py-2 text-gray-500 hover:text-primary-600 focus:outline-none rounded-r-md bg-gray-100 hover:bg-gray-200 transition-colors';
    generateBtn.innerHTML = '<i class="fas fa-dice"></i>';
    generateBtn.title = '生成随机令牌';
    // Event listener will be added via delegation in DOMContentLoaded
    return generateBtn;
}

/**
 * Creates a remove button for an array item.
 * @returns {HTMLButtonElement} The created button element.
 */
function createRemoveButton() {
    const removeBtn = document.createElement('button');
    removeBtn.type = 'button';
    removeBtn.className = 'remove-btn text-gray-400 hover:text-red-500 focus:outline-none transition-colors duration-150';
    removeBtn.innerHTML = '<i class="fas fa-trash-alt"></i>';
    removeBtn.title = '删除';
    // Event listener will be added via delegation in DOMContentLoaded
    return removeBtn;
}


/**
 * Adds a new item to an array configuration section (e.g., API_KEYS, ALLOWED_TOKENS).
 * This function is typically called by a "+" button.
 * @param {string} key - The configuration key for the array (e.g., 'API_KEYS').
 */
function addArrayItem(key) {
    const container = document.getElementById(`${key}_container`);
    if (!container) return;

    const newItemValue = ''; // New items start empty
    const modelId = addArrayItemWithValue(key, newItemValue); // This adds the DOM element

    if (key === 'THINKING_MODELS' && modelId) {
        createAndAppendBudgetMapItem(newItemValue, 0, modelId); // Default budget 0
    }
}


/**
 * Adds an array item with a specific value to the DOM.
 * This is used both for initially populating the form and for adding new items.
 * @param {string} key - The configuration key (e.g., 'API_KEYS', 'THINKING_MODELS').
 * @param {string} value - The value for the array item.
 * @returns {string|null} The generated modelId if it's a thinking model, otherwise null.
 */
function addArrayItemWithValue(key, value) {
    const container = document.getElementById(`${key}_container`);
    if (!container) return null;

    const isThinkingModel = key === 'THINKING_MODELS';
    const isAllowedToken = key === 'ALLOWED_TOKENS';
    const isSensitive = key === 'API_KEYS' || isAllowedToken;
    const modelId = isThinkingModel ? generateUUID() : null;

    const arrayItem = document.createElement('div');
    arrayItem.className = `${ARRAY_ITEM_CLASS} flex items-center mb-2 gap-2`;
    if (isThinkingModel) {
        arrayItem.setAttribute('data-model-id', modelId);
    }

    const inputWrapper = document.createElement('div');
    inputWrapper.className = 'flex items-center flex-grow border border-gray-300 rounded-md focus-within:border-primary-500 focus-within:ring focus-within:ring-primary-200 focus-within:ring-opacity-50';

    const input = createArrayInput(key, value, isSensitive, isThinkingModel ? modelId : null);
    inputWrapper.appendChild(input);

    if (isAllowedToken) {
        const generateBtn = createGenerateTokenButton();
        inputWrapper.appendChild(generateBtn);
    } else {
        // Ensure right-side rounding if no button is present
        input.classList.add('rounded-r-md');
    }
    
    const removeBtn = createRemoveButton();

    arrayItem.appendChild(inputWrapper);
    arrayItem.appendChild(removeBtn);
    container.appendChild(arrayItem);

    // Initialize sensitive field if applicable
    if (isSensitive && input.value) {
        if (configForm && typeof initializeSensitiveFields === 'function') {
            const focusoutEvent = new Event('focusout', { bubbles: true, cancelable: true });
            input.dispatchEvent(focusoutEvent);
        }
    }
    return isThinkingModel ? modelId : null;
}


/**
 * Creates and appends a DOM element for a thinking model's budget mapping.
 * @param {string} mapKey - The model name (key for the map).
 * @param {number|string} mapValue - The budget value.
 * @param {string} modelId - The unique ID of the corresponding thinking model.
 */
function createAndAppendBudgetMapItem(mapKey, mapValue, modelId) {
   const container = document.getElementById('THINKING_BUDGET_MAP_container');
   if (!container) {
       console.error("Cannot add budget item: THINKING_BUDGET_MAP_container not found!");
       return;
   }

   // If container currently only has the placeholder, clear it
   const placeholder = container.querySelector('.text-gray-500.italic');
   // Check if the only child is the placeholder before clearing
   if (placeholder && container.children.length === 1 && container.firstChild === placeholder) {
       container.innerHTML = '';
   }

   const mapItem = document.createElement('div');
   mapItem.className = `${MAP_ITEM_CLASS} flex items-center mb-2 gap-2`;
   mapItem.setAttribute('data-model-id', modelId);

   const keyInput = document.createElement('input');
   keyInput.type = 'text';
   keyInput.value = mapKey;
   keyInput.placeholder = '模型名称 (自动关联)';
   keyInput.readOnly = true;
   keyInput.className = `${MAP_KEY_INPUT_CLASS} flex-grow px-3 py-2 border border-gray-300 rounded-md focus:outline-none bg-gray-100 text-gray-500`;
   keyInput.setAttribute('data-model-id', modelId);

   const valueInput = document.createElement('input');
   valueInput.type = 'number';
   const intValue = parseInt(mapValue, 10);
   valueInput.value = isNaN(intValue) ? 0 : intValue;
   valueInput.placeholder = '预算 (整数)';
   valueInput.className = `${MAP_VALUE_INPUT_CLASS} w-24 px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:border-primary-500 focus:ring focus:ring-primary-200 focus:ring-opacity-50`;
   valueInput.min = 0;
   valueInput.max = 24576;
   valueInput.addEventListener('input', function() {
       let val = this.value.replace(/[^0-9]/g, '');
       if (val !== '') {
           val = parseInt(val, 10);
           if (val < 0) val = 0;
           if (val > 24576) val = 24576;
       }
       this.value = val; // Corrected variable name
   });

   // Remove Button - Removed for budget map items
   // const removeBtn = document.createElement('button');
   // removeBtn.type = 'button';
   // removeBtn.className = 'remove-btn text-gray-300 cursor-not-allowed focus:outline-none'; // Kept original class for reference
   // removeBtn.innerHTML = '<i class="fas fa-trash-alt"></i>';
   // removeBtn.title = '请从上方模型列表删除';
   // removeBtn.disabled = true;

   mapItem.appendChild(keyInput);
   mapItem.appendChild(valueInput);
   // mapItem.appendChild(removeBtn); // Do not append the remove button

   container.appendChild(mapItem);
}

/**
 * Collects all data from the configuration form.
 * @returns {object} An object containing all configuration data.
 */
function collectFormData() {
    const formData = {};

    // 处理普通输入和 select
    const inputsAndSelects = document.querySelectorAll('input[type="text"], input[type="number"], input[type="password"], select, textarea');
    inputsAndSelects.forEach(element => {
        if (element.name && !element.name.includes('[]') && !element.closest('.array-container') && !element.closest(`.${MAP_ITEM_CLASS}`) && !element.closest(`.${SAFETY_SETTING_ITEM_CLASS}`)) {
            if (element.type === 'number') {
                formData[element.name] = parseFloat(element.value);
            } else if (element.classList.contains(SENSITIVE_INPUT_CLASS) && element.hasAttribute('data-real-value')) {
                formData[element.name] = element.getAttribute('data-real-value');
            } else {
                formData[element.name] = element.value;
            }
        }
    });

    const checkboxes = document.querySelectorAll('input[type="checkbox"]');
    checkboxes.forEach(checkbox => {
        formData[checkbox.name] = checkbox.checked;
    });

    const arrayContainers = document.querySelectorAll('.array-container');
    arrayContainers.forEach(container => {
        const key = container.id.replace('_container', '');
        const arrayInputs = container.querySelectorAll(`.${ARRAY_INPUT_CLASS}`);
        formData[key] = Array.from(arrayInputs).map(input => {
            if (input.classList.contains(SENSITIVE_INPUT_CLASS) && input.hasAttribute('data-real-value')) {
                return input.getAttribute('data-real-value');
            }
            return input.value;
        }).filter(value => value && value.trim() !== '' && value !== MASKED_VALUE); // Ensure MASKED_VALUE is also filtered if not handled
    });

    const budgetMapContainer = document.getElementById('THINKING_BUDGET_MAP_container');
    if (budgetMapContainer) {
        formData['THINKING_BUDGET_MAP'] = {};
        const mapItems = budgetMapContainer.querySelectorAll(`.${MAP_ITEM_CLASS}`);
        mapItems.forEach(item => {
            const keyInput = item.querySelector(`.${MAP_KEY_INPUT_CLASS}`);
            const valueInput = item.querySelector(`.${MAP_VALUE_INPUT_CLASS}`);
            if (keyInput && valueInput && keyInput.value.trim() !== '') {
                const budgetValue = parseInt(valueInput.value, 10);
                formData['THINKING_BUDGET_MAP'][keyInput.value.trim()] = isNaN(budgetValue) ? 0 : budgetValue;
            }
        });
    }

    if (safetySettingsContainer) {
        formData['SAFETY_SETTINGS'] = [];
        const settingItems = safetySettingsContainer.querySelectorAll(`.${SAFETY_SETTING_ITEM_CLASS}`);
        settingItems.forEach(item => {
            const categorySelect = item.querySelector('.safety-category-select');
            const thresholdSelect = item.querySelector('.safety-threshold-select');
            if (categorySelect && thresholdSelect && categorySelect.value && thresholdSelect.value) {
                formData['SAFETY_SETTINGS'].push({
                    category: categorySelect.value,
                    threshold: thresholdSelect.value
                });
            }
        });
    }

    return formData;
}

/**
 * Stops the scheduler task on the server.
 */
async function stopScheduler() {
    try {
        const response = await fetch('/api/scheduler/stop', { method: 'POST' });
        if (!response.ok) {
            console.warn(`停止定时任务失败: ${response.status}`);
        } else {
            console.log('定时任务已停止');
        }
    } catch (error) {
        console.error('调用停止定时任务API时出错:', error);
    }
}

/**
 * Starts the scheduler task on the server.
 */
async function startScheduler() {
    try {
        const response = await fetch('/api/scheduler/start', { method: 'POST' });
        if (!response.ok) {
            console.warn(`启动定时任务失败: ${response.status}`);
        } else {
            console.log('定时任务已启动');
        }
    } catch (error) {
        console.error('调用启动定时任务API时出错:', error);
    }
}

/**
 * Saves the current configuration to the server.
 */
async function saveConfig() {
    try {
        const formData = collectFormData();

        showNotification('正在保存配置...', 'info');

        // 1. 停止定时任务
        await stopScheduler();

        const response = await fetch('/api/config', {
            method: 'PUT',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(formData)
        });

        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.detail || `HTTP error! status: ${response.status}`);
        }

        const result = await response.json();

        // 移除居中的 saveStatus 提示

        showNotification('配置保存成功', 'success');

        // 3. 启动新的定时任务
        await startScheduler();

    } catch (error) {
        console.error('保存配置失败:', error);
        // 保存失败时，也尝试重启定时任务，以防万一
        await startScheduler();
        // 移除居中的 saveStatus 提示

        showNotification('保存配置失败: ' + error.message, 'error');
    }
}

/**
 * Initiates the configuration reset process by showing a confirmation modal.
 * @param {Event} [event] - The click event, if triggered by a button.
 */
function resetConfig(event) {
    // 阻止事件冒泡和默认行为
    if (event) {
        event.preventDefault();
        event.stopPropagation();
    }

    console.log('resetConfig called. Event target:', event ? event.target.id : 'No event');

    // Ensure modal is shown only if the event comes from the reset button
    if (!event || event.target.id === 'resetBtn' || (event.currentTarget && event.currentTarget.id === 'resetBtn')) {
        if (resetConfirmModal) {
            openModal(resetConfirmModal);
        } else {
            console.error("Reset confirmation modal not found! Falling back to default confirm.");
            if (confirm('确定要重置所有配置吗？这将恢复到默认值。')) {
                executeReset();
            }
        }
    }
}

/**
 * Executes the actual configuration reset after confirmation.
 */
async function executeReset() {
    try {
        showNotification('正在重置配置...', 'info');

        // 1. 停止定时任务
        await stopScheduler();
        const response = await fetch('/api/config/reset', { method: 'POST' });
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        const config = await response.json();
        populateForm(config);
        // Re-initialize masking for sensitive fields after reset
        if (configForm && typeof initializeSensitiveFields === 'function') {
            const sensitiveFields = configForm.querySelectorAll(`.${SENSITIVE_INPUT_CLASS}`);
            sensitiveFields.forEach(field => {
                 if (field.type === 'password') {
                    if (field.value) field.setAttribute('data-real-value', field.value);
                } else if (field.type === 'text' || field.tagName.toLowerCase() === 'textarea') {
                    const focusoutEvent = new Event('focusout', { bubbles: true, cancelable: true });
                    field.dispatchEvent(focusoutEvent);
                }
            });
        }
        showNotification('配置已重置为默认值', 'success');

        // 3. 启动新的定时任务
        await startScheduler();

    } catch (error) {
        console.error('重置配置失败:', error);
        showNotification('重置配置失败: ' + error.message, 'error');
        // 重置失败时，也尝试重启定时任务
        await startScheduler();
    }
}

/**
 * Displays a notification message to the user.
 * @param {string} message - The message to display.
 * @param {string} [type='info'] - The type of notification ('info', 'success', 'error', 'warning').
 */
function showNotification(message, type = 'info') {
    const notification = document.getElementById('notification');
    notification.textContent = message;

    // 统一样式为黑色半透明，与 keys_status.js 保持一致
    notification.classList.remove('bg-danger-500');
    notification.classList.add('bg-black');
    notification.style.backgroundColor = 'rgba(0,0,0,0.8)';
    notification.style.color = '#fff';

    // 应用过渡效果
    notification.style.opacity = "1";
    notification.style.transform = "translate(-50%, 0)";

    // 设置自动消失
    setTimeout(() => {
        notification.style.opacity = "0";
        notification.style.transform = "translate(-50%, 10px)";
    }, 3000);
}

/**
 * Refreshes the current page.
 * @param {HTMLButtonElement} [button] - The button that triggered the refresh (to show loading state).
 */
function refreshPage(button) {
    if (button) button.classList.add('loading');
    location.reload();
}

/**
 * Scrolls the page to the top.
 */
function scrollToTop() {
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

/**
 * Scrolls the page to the bottom.
 */
function scrollToBottom() {
    window.scrollTo({ top: document.body.scrollHeight, behavior: 'smooth' });
}

/**
 * Toggles the visibility of scroll-to-top/bottom buttons based on scroll position.
 */
function toggleScrollButtons() {
    const scrollButtons = document.querySelector('.scroll-buttons');
    if (scrollButtons) {
        scrollButtons.style.display = (window.scrollY > 200) ? 'flex' : 'none';
    }
}

/**
 * Generates a random token string.
 * @returns {string} A randomly generated token.
 */
function generateRandomToken() {
    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_';
    const length = 48;
    let result = 'sk-';
    for (let i = 0; i < length; i++) {
        result += characters.charAt(Math.floor(Math.random() * characters.length));
    }
    return result;
}

/**
 * Adds a new safety setting item to the DOM.
 * @param {string} [category=''] - The initial category for the setting.
 * @param {string} [threshold=''] - The initial threshold for the setting.
 */
function addSafetySettingItem(category = '', threshold = '') {
    const container = document.getElementById('SAFETY_SETTINGS_container');
    if (!container) {
        console.error("Cannot add safety setting: SAFETY_SETTINGS_container not found!");
        return;
    }

    // 如果容器当前只有占位符，则清除它
    const placeholder = container.querySelector('.text-gray-500.italic');
    if (placeholder && container.children.length === 1 && container.firstChild === placeholder) {
        container.innerHTML = '';
    }

    const harmCategories = [
        "HARM_CATEGORY_HARASSMENT",
        "HARM_CATEGORY_HATE_SPEECH",
        "HARM_CATEGORY_SEXUALLY_EXPLICIT",
        "HARM_CATEGORY_DANGEROUS_CONTENT",
        "HARM_CATEGORY_CIVIC_INTEGRITY" // 根据需要添加或移除
    ];
    const harmThresholds = [
        "BLOCK_NONE",
        "BLOCK_LOW_AND_ABOVE",
        "BLOCK_MEDIUM_AND_ABOVE",
        "BLOCK_ONLY_HIGH",
        "OFF" // 根据 Google API 文档添加或移除
    ];

    const settingItem = document.createElement('div');
    settingItem.className = `${SAFETY_SETTING_ITEM_CLASS} flex items-center mb-2 gap-2`;

    const categorySelect = document.createElement('select');
    categorySelect.className = 'safety-category-select flex-grow px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:border-primary-500 focus:ring focus:ring-primary-200 focus:ring-opacity-50 bg-white';
    harmCategories.forEach(cat => {
        const option = document.createElement('option');
        option.value = cat;
        option.textContent = cat.replace('HARM_CATEGORY_', '');
        if (cat === category) option.selected = true;
        categorySelect.appendChild(option);
    });

    const thresholdSelect = document.createElement('select');
    thresholdSelect.className = 'safety-threshold-select w-48 px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:border-primary-500 focus:ring focus:ring-primary-200 focus:ring-opacity-50 bg-white';
    harmThresholds.forEach(thr => {
        const option = document.createElement('option');
        option.value = thr;
        option.textContent = thr.replace('BLOCK_', '').replace('_AND_ABOVE', '+');
        if (thr === threshold) option.selected = true;
        thresholdSelect.appendChild(option);
    });

    const removeBtn = document.createElement('button');
    removeBtn.type = 'button';
    removeBtn.className = 'remove-btn text-gray-400 hover:text-red-500 focus:outline-none transition-colors duration-150';
    removeBtn.innerHTML = '<i class="fas fa-trash-alt"></i>';
    removeBtn.title = '删除此设置';
    // Event listener for removeBtn is now handled by event delegation in DOMContentLoaded

    settingItem.appendChild(categorySelect);
    settingItem.appendChild(thresholdSelect);
    settingItem.appendChild(removeBtn);

    container.appendChild(settingItem);
}