import type { AIMCPClientInstallStatus } from '../types';

export type MCPClientKey = 'claude-code' | 'codex' | 'openclaw' | 'hermans';

const AUTO_MCP_CLIENTS = new Set<MCPClientKey>(['claude-code', 'codex']);
const REMOTE_MCP_CLIENTS = new Set<MCPClientKey>(['openclaw', 'hermans']);
const DEFAULT_REMOTE_MCP_PUBLIC_URL = 'https://<你的域名或隧道地址>/mcp';
const DEFAULT_REMOTE_MCP_LOCAL_ADDR = '127.0.0.1:8765';
const DEFAULT_REMOTE_MCP_PATH = '/mcp';

export interface RemoteMCPClientQuickStart {
  displayName: string;
  configJson: string;
  configCommand: string;
  launchCommand: string;
  standaloneCommand: string;
  verificationSteps: string[];
  securityNotes: string[];
}

export interface RemoteMCPParameterGuide {
  key: string;
  title: string;
  required: boolean;
  fill: string;
  example: string;
  avoid: string;
}

export const REMOTE_MCP_PARAMETER_GUIDES: RemoteMCPParameterGuide[] = [
  {
    key: 'publicUrl',
    title: '公网/隧道 URL',
    required: true,
    fill: '填云端 Agent 能访问到的 Streamable HTTP MCP 地址，通常以 /mcp 结尾。',
    example: 'https://agent-gateway.example.com/mcp',
    avoid: '不要填 Windows 本机的 127.0.0.1；云端 Linux 访问不到这个地址。',
  },
  {
    key: 'bearerToken',
    title: 'Bearer Token',
    required: true,
    fill: '填一段随机长 token，Windows 启动命令和云端 Agent 配置必须一致。',
    example: 'Authorization: Bearer gnv_xxx',
    avoid: '不要使用空 token、短 token，也不要把数据库密码当 token 填进去。',
  },
  {
    key: 'localAddr',
    title: '本机监听地址',
    required: true,
    fill: 'Windows GoNavi HTTP MCP 默认监听 127.0.0.1:8765，再交给隧道或反向代理转发。',
    example: DEFAULT_REMOTE_MCP_LOCAL_ADDR,
    avoid: '没有网关隔离时不要直接绑定 0.0.0.0 暴露到公网。',
  },
  {
    key: 'path',
    title: 'MCP 路径',
    required: true,
    fill: '本机启动命令、隧道 URL 和云端 Agent 配置里的路径要保持一致。',
    example: DEFAULT_REMOTE_MCP_PATH,
    avoid: '不要一边用 /mcp，另一边配置 /api/mcp，路径不一致会 404。',
  },
  {
    key: 'serverId',
    title: '服务 ID',
    required: false,
    fill: '给云端 Agent 识别这条 MCP 服务的名称，默认 gonavi 即可。',
    example: 'gonavi',
    avoid: '不要频繁改名，否则 Agent 里已有的工具引用可能失效。',
  },
];

export const EMPTY_MCP_CLIENT_STATUSES: AIMCPClientInstallStatus[] = [
  {
    client: 'claude-code',
    displayName: 'Claude Code',
    installMode: 'auto',
    installed: false,
    matchesCurrent: false,
    clientDetected: false,
    clientCommand: 'claude',
    message: '未检测到 Claude Code 用户级 GoNavi MCP 配置',
  },
  {
    client: 'codex',
    displayName: 'Codex',
    installMode: 'auto',
    installed: false,
    matchesCurrent: false,
    clientDetected: false,
    clientCommand: 'codex',
    message: '未检测到 Codex 用户级 GoNavi MCP 配置',
  },
  {
    client: 'openclaw',
    displayName: 'OpenClaw',
    installMode: 'remote',
    installed: false,
    matchesCurrent: false,
    clientDetected: false,
    clientCommand: 'openclaw',
    message: 'OpenClaw 通常部署在云端 Linux；请通过远程 MCP 桥接接入 Windows GoNavi，不要复制数据库密码。',
  },
  {
    client: 'hermans',
    displayName: 'Hermans',
    installMode: 'remote',
    installed: false,
    matchesCurrent: false,
    clientDetected: false,
    clientCommand: 'hermans',
    message: 'Hermans 这类远程 Agent 请通过远程 MCP 桥接接入 Windows GoNavi，不要复制数据库密码。',
  },
];

const MCP_CLIENT_ORDER: MCPClientKey[] = ['claude-code', 'codex', 'openclaw', 'hermans'];

const quoteMCPCommandPart = (value: string): string => {
  const text = String(value || '').trim();
  if (!text) {
    return '';
  }
  return /[\s"]/u.test(text) ? `"${text.replace(/"/g, '\\"')}"` : text;
};

export const isMCPClientKey = (client: string): client is MCPClientKey =>
  client === 'claude-code' || client === 'codex' || client === 'openclaw' || client === 'hermans';

export const isRemoteMCPClientStatus = (status?: Pick<AIMCPClientInstallStatus, 'client' | 'installMode'> | null): boolean => {
  const client = String(status?.client || '').trim();
  return status?.installMode === 'remote' || (isMCPClientKey(client) && REMOTE_MCP_CLIENTS.has(client));
};

export const supportsAutoMCPClientInstall = (status?: Pick<AIMCPClientInstallStatus, 'client' | 'installMode'> | null): boolean => {
  const client = String(status?.client || '').trim();
  return status?.installMode === 'auto' || (isMCPClientKey(client) && AUTO_MCP_CLIENTS.has(client));
};

const hasStatusError = (status: AIMCPClientInstallStatus): boolean =>
  /失败|异常|错误|校验失败/u.test(String(status.message || ''));

const getMCPClientPriority = (status: AIMCPClientInstallStatus): number => {
  if (status.matchesCurrent) {
    return 0;
  }
  if (status.installed && !status.matchesCurrent) {
    return 1;
  }
  if (status.clientDetected) {
    return 2;
  }
  if (hasStatusError(status)) {
    return 3;
  }
  return 4;
};

export const normalizeMCPClientStatuses = (items?: AIMCPClientInstallStatus[]): AIMCPClientInstallStatus[] => {
  const baseMap = new Map<string, AIMCPClientInstallStatus>(
    EMPTY_MCP_CLIENT_STATUSES.map((item) => [item.client, { ...item }]),
  );
  (Array.isArray(items) ? items : []).forEach((item) => {
    if (!item || !item.client) {
      return;
    }
    const base = baseMap.get(item.client) || {
      client: item.client,
      displayName: item.client,
      installed: false,
      matchesCurrent: false,
      message: '',
    };
    baseMap.set(item.client, {
      ...base,
      ...item,
      displayName: item.displayName || base.displayName,
      installMode: item.installMode || base.installMode || 'auto',
      clientDetected: item.clientDetected ?? base.clientDetected ?? false,
      clientCommand: item.clientCommand || base.clientCommand,
      clientPath: item.clientPath || '',
      message: item.message || base.message,
      args: Array.isArray(item.args) ? item.args : (base.args || []),
    });
  });
  return MCP_CLIENT_ORDER
    .map((client) => baseMap.get(client))
    .filter((item): item is AIMCPClientInstallStatus => Boolean(item));
};

export const pickPreferredMCPClient = (
  items: AIMCPClientInstallStatus[],
  current?: MCPClientKey,
): MCPClientKey => {
  if (current && items.some((item) => item.client === current)) {
    return current;
  }

  const ranked = items
    .filter((item): item is AIMCPClientInstallStatus & { client: MCPClientKey } => isMCPClientKey(item.client))
    .slice()
    .sort((left, right) => {
      const priorityDiff = getMCPClientPriority(left) - getMCPClientPriority(right);
      if (priorityDiff !== 0) {
        return priorityDiff;
      }
      return MCP_CLIENT_ORDER.indexOf(left.client) - MCP_CLIENT_ORDER.indexOf(right.client);
    });

  return ranked[0]?.client || 'claude-code';
};

export const formatMCPLaunchCommand = (
  input?: Pick<AIMCPClientInstallStatus, 'command' | 'args'> | { command?: string; args?: string[] } | null,
): string => {
  const command = String(input?.command || '').trim();
  if (!command) {
    return '';
  }
  const args = Array.isArray(input?.args)
    ? input.args.map((item) => String(item || '').trim()).filter(Boolean)
    : [];
  return [command, ...args].map(quoteMCPCommandPart).filter(Boolean).join(' ');
};

export const buildRemoteMCPClientGuide = (
  status?: Partial<Pick<AIMCPClientInstallStatus, 'client' | 'displayName' | 'message'>> | null,
): string => {
  const quickStart = buildRemoteMCPClientQuickStart(status);
  return [
    `GoNavi MCP 远程接入说明 - ${quickStart.displayName}`,
    '',
    '目标：',
    '- 数据库连接、账号和密码继续保存在 Windows 上的 GoNavi。云端 Agent 不需要保存数据库密码。',
    '- 云端 Agent 只通过 MCP tools 读取 get_connections/get_databases/get_tables/get_columns/get_table_ddl 等结果。',
    '- 远程接入默认使用 schema-only 模式，不注册 execute_sql，适合只给 OpenClaw/Hermans 读取库表结构。',
    '',
    '当前边界：',
    '- GoNavi 内置 MCP 本机入口是 stdio，适合 Claude Code / Codex 这类和 GoNavi 在同一台机器上的客户端。',
    '- 如果 OpenClaw/Hermans 部署在云端 Linux，不能直接使用 Windows 本地 stdio 命令；可在 Windows 上启动 GoNavi Streamable HTTP 模式，再通过隧道或反向代理给云端 Agent 调用。',
    '',
    '建议接入方式：',
    '1. Windows 本机保持 GoNavi 可访问，由 GoNavi 读取保存连接和系统凭据。',
    `2. 在 Windows 或可信内网侧运行：${quickStart.launchCommand}。`,
    `3. 在 ${quickStart.displayName} 中添加远程 MCP Server，transport 选择 Streamable HTTP，URL 填隧道/反向代理后的 /mcp 地址，并设置 Authorization: Bearer <随机token>。`,
    '4. 先调用 get_connections 获取 connectionId，再调用表结构工具；不要把数据库 host/user/password 写进云端 Agent 配置。',
    '',
    '可复制配置片段（适用于支持 mcpServers JSON 的 Agent）：',
    ...quickStart.configJson.split('\n'),
    '',
    '无 GUI / CLI 生成配置命令：',
    quickStart.configCommand,
    '',
    'CLI / 服务启动命令：',
    quickStart.launchCommand,
    `或设置环境变量：GONAVI_MCP_HTTP_TOKEN=<随机token> 后运行 ${quickStart.standaloneCommand.replace(' --token <随机token>', '')}`,
    '如果明确需要远程执行 SQL，可去掉 --schema-only；此时 execute_sql 仍受 GoNavi AI 安全控制约束，写操作必须显式传 allowMutating=true。',
    '',
    status?.message ? `当前提示：${status.message}` : '',
  ].filter((line, index, lines) => line || index < lines.length - 1).join('\n');
};

export const buildRemoteMCPClientQuickStart = (
  status?: Partial<Pick<AIMCPClientInstallStatus, 'client' | 'displayName'>> | null,
): RemoteMCPClientQuickStart => {
  const displayName = String(status?.displayName || '远程 Agent').trim();
  const client = isMCPClientKey(String(status?.client || '')) ? String(status?.client || '').trim() : 'openclaw';
  const launchCommand = `GoNavi.exe mcp-server http --addr ${DEFAULT_REMOTE_MCP_LOCAL_ADDR} --path ${DEFAULT_REMOTE_MCP_PATH} --token <随机token> --schema-only`;
  const standaloneCommand = `gonavi-mcp-server http --addr ${DEFAULT_REMOTE_MCP_LOCAL_ADDR} --path ${DEFAULT_REMOTE_MCP_PATH} --token <随机token> --schema-only`;
  const configCommand = `GoNavi.exe mcp-server remote-config --client ${client} --url ${DEFAULT_REMOTE_MCP_PUBLIC_URL} --token <随机token> --schema-only`;
  const configJson = JSON.stringify({
    mcpServers: {
      gonavi: {
        type: 'streamable-http',
        url: DEFAULT_REMOTE_MCP_PUBLIC_URL,
        headers: {
          Authorization: 'Bearer <随机token>',
        },
      },
    },
  }, null, 2);

  return {
    displayName,
    configJson,
    configCommand,
    launchCommand,
    standaloneCommand,
    verificationSteps: [
      'Windows 本机先访问 http://127.0.0.1:8765/healthz，确认 GoNavi MCP HTTP 服务已启动。',
      `${displayName} 里配置 Streamable HTTP MCP，URL 指向隧道或反向代理后的 /mcp 地址。`,
      '先调用 get_connections 获取 connectionId，再读取 get_databases / get_tables / get_columns。',
    ],
    securityNotes: [
      '数据库账号和密码仍保存在 Windows GoNavi，本段配置不要写数据库密码。',
      '默认 --schema-only 不注册 execute_sql，远程 Agent 只能走库表结构类工具。',
      'HTTP MCP 必须使用随机 Bearer Token，并放在 HTTPS、私有网络或受控隧道后面。',
      '如去掉 --schema-only 开放 execute_sql，仍受 GoNavi AI 安全控制约束，写操作仍必须显式传 allowMutating=true。',
    ],
  };
};