<template>
  <div class="gallery-container" @scroll="handleScroll">
    <div class="gallery-header">
      <label for="storage-select">存储类型:</label>
      <select id="storage-select" v-model="selectedStorageType" @change="fetchFiles(true)">
        <option v-for="option in storageOptions" :key="option.value" :value="option.value">
          {{ option.label }}
        </option>
      </select>
      <label for="file-name-input">&nbsp;&nbsp;&nbsp;&nbsp;文件名:</label>
      <el-input v-model="selectedFileName" placeholder="请输入文件名" class="file-name-input" style="width: 150px;"
        @change="fetchFiles(true)"></el-input>
    </div>
    <div v-if="filePage.length === 0 && !loading" class="empty-tips">
      🖼️ 暂无已上传的文件
    </div>
    <div v-else-if="loading && filePage.length === 0" class="loading-tips">
      加载中...
    </div>
    <div v-else class="file-grid">
      <div v-for="file in filePage" :key="file.id" class="file-card">
        <div class="preview-wrapper">
          <img v-if="isImage(file)" :src="file.accessUrl" :alt="file.fileName" class="preview-image"
            @click="openImagePreview(file)" loading="lazy" />
          <div v-else-if="isVideo(file)" class="video-preview" @click="openVideoPreview(file)">
            <div class="play-button">▶</div>
          </div>
          <div v-else-if="isPdf(file)" class="pdf-preview" @click="openPdfPreview(file)">
            <div class="pdf-icon">📜</div>
          </div>
          <div v-else class="file-icon">📄</div>
          <div class="copy-button" @click.stop="copyUrl(file.accessUrl)" title="复制文件URL">📋</div>
        </div>
        <div class="file-meta">
          <div class="filename">{{ file.fileName }}</div>
          <div class="file-size-status">
            <div class="file-size">{{ formatSize(file.totalSize) }}</div>
            <div class="status-indicator">{{ formattedDate(file.createTime) }}</div>
          </div>
        </div>
      </div>
    </div>
    <div v-if="loading && filePage.length > 0" class="loading-more">加载更多...</div>

    <!-- 预览弹窗 -->
    <div v-if="showImagePreview" class="image-preview-modal" @click="closeImagePreview">
      <div class="image-preview-content" @click.stop>
        <img :src="selectedImageUrl" alt="预览图片" class="full-image" />
        <div class="close-button" @click="closeImagePreview">✖</div>
      </div>
    </div>
    <div v-if="showVideoPreview" class="video-preview-modal" @click="closeVideoPreview">
      <div class="video-preview-content" @click.stop>
        <video :src="selectedVideoUrl" controls class="full-video" autoplay></video>
        <div class="close-button" @click="closeVideoPreview">✖</div>
      </div>
    </div>
    <div v-if="showPdfPreview" class="pdf-preview-modal" @click="closePdfPreview">
      <div class="pdf-preview-content" @click.stop>
        <div v-if="loadingPdf" class="loading-overlay">
          <div class="loading-spinner"></div>
          <p>加载 PDF 中...</p>
        </div>
        <iframe v-show="!loadingPdf" :src="selectedPdfUrl" class="full-pdf" frameborder="0" @load="onPdfLoad"></iframe>
        <div class="close-button" @click="closePdfPreview">✖</div>
      </div>
    </div>
  </div>
</template>

<script>
import { pageFiles } from '@/utils/api';

export default {
  name: 'FileGallery',
  props: {
    storageOptions: {
      type: Array,
      default: () => [
        { label: 'Local', value: 'local' },
        { label: 'MinIO', value: 'minio' },
        { label: 'OSS', value: 'oss' }
      ]
    }
  },
  data() {
    return {
      selectedStorageType: 'local',
      selectedFileName: '',
      currentPage: 1,
      pageSize: 10,
      loading: false,
      hasMore: true,
      filePage: [],
      showImagePreview: false,
      selectedImageUrl: '',
      showVideoPreview: false,
      selectedVideoUrl: '',
      showPdfPreview: false,
      selectedPdfUrl: '',
      loadingPdf: false
    };
  },
  methods: {
    async fetchFiles(reset = false) {
      if (this.loading || (!reset && !this.hasMore)) return;
      this.loading = true;
      if (reset) {
        this.currentPage = 1;
        this.filePage = [];
        this.hasMore = true;
      }
      try {
        const response = await pageFiles({
          page: this.currentPage,
          pageSize: this.pageSize,
          storageType: this.selectedStorageType,
          fileName: this.selectedFileName
        });
        const files = response.data.records || [];
        this.filePage = reset ? files : this.filePage.concat(files);
        this.hasMore = files.length === this.pageSize;
        if (this.hasMore) this.currentPage++;
      } catch (error) {
        console.error('获取文件列表失败:', error);
        this.$message.error('加载文件列表失败');
      } finally {
        this.loading = false;
      }
    },
    handleScroll(event) {
      const container = event.target;
      const isBottom = container.scrollTop + container.clientHeight >= container.scrollHeight - 10;
      if (isBottom && !this.loading && this.hasMore) this.fetchFiles();
    },
    isImage(file) {
      return file.contentType.startsWith('image/');
    },
    isVideo(file) {
      return file.contentType.startsWith('video/');
    },
    isPdf(file) {
      return file.contentType === 'application/pdf';
    },
    formatSize(bytes) {
      if (bytes === 0) return '0 B';
      const k = 1024;
      const sizes = ['B', 'KB', 'MB', 'GB'];
      const i = Math.floor(Math.log(bytes) / Math.log(k));
      return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
    },
    formattedDate(date) {
      const d = new Date(date);
      return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
    },
    openImagePreview(file) {
      this.selectedImageUrl = file.accessUrl;
      this.showImagePreview = true;
    },
    closeImagePreview() {
      this.showImagePreview = false;
      this.selectedImageUrl = '';
    },
    openVideoPreview(file) {
      this.selectedVideoUrl = file.accessUrl;
      this.showVideoPreview = true;
    },
    closeVideoPreview() {
      this.showVideoPreview = false;
      this.selectedVideoUrl = '';
    },
    openPdfPreview(file) {
      this.selectedPdfUrl = `${file.accessUrl}?response-content-disposition=inline`;
      this.showPdfPreview = true;
      this.loadingPdf = true;
    },
    onPdfLoad() {
      this.loadingPdf = false;
    },
    closePdfPreview() {
      this.showPdfPreview = false;
      this.selectedPdfUrl = '';
      this.loadingPdf = false;
    },
    async copyUrl(url) {
      try {
        await navigator.clipboard.writeText(url);
        this.$message({ message: '文件URL已复制到剪贴板', type: 'success', duration: 2000 });
      } catch (error) {
        console.error('复制URL失败:', error);
        this.$message.error('复制URL失败');
      }
    }
  },
  mounted() {
    this.fetchFiles(true);
  }
};
</script>

<style scoped>
/* eslint-disable */
.gallery-container {
  padding: 1rem 2rem 2rem;
  height: 400px;
  background: #fcfdff;
  border-top: 1px solid #f0f7ff;
  overflow-y: auto;
}

.gallery-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
}

.gallery-header label {
  font-size: 14px;
  color: #333;
}

.gallery-header select {
  padding: 6px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  background: #fff;
  cursor: pointer;
}

.empty-tips,
.loading-tips {
  text-align: center;
  color: #999;
  font-size: 1.2rem;
  padding: 4rem 0;
}

.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.loading-more {
  text-align: center;
  color: #666;
  font-size: 14px;
  padding: 1rem 0;
}

.file-card {
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.file-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 3px 8px rgba(25, 118, 210, 0.2);
}

.copy-button {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.2s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.file-card:hover .copy-button {
  opacity: 1;
}

.preview-wrapper {
  position: relative;
  padding-top: 100%;
  background: #f8fafd;
}

.preview-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-bottom: 1px solid #eee;
}

.file-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  opacity: 0.6;
}

.file-meta {
  padding: 0.8rem;
  display: flex;
  flex-direction: column;
}

.file-size-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.filename {
  font-weight: 500;
  color: #333;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 0.7rem;
  color: #666;
  margin: 0.2rem 0;
}

.status-indicator {
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-size: 0.65rem;
  background: #e8f5e9;
  color: #2e7d32;
}

.image-preview-modal,
.video-preview-modal,
.pdf-preview-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 200;
}

.image-preview-content,
.video-preview-content,
.pdf-preview-content {
  position: relative;
  width: 90vw;
  height: 90vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.full-image,
.full-video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.full-pdf {
  width: 100%;
  height: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  background: #fff;
}

.close-button {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 30px;
  height: 30px;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 18px;
}

.video-preview {
  position: relative;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  opacity: 0.8;
  margin-top: -105px;
}

.pdf-preview {
  position: relative;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.pdf-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  opacity: 0.8;
  margin-top: -105px;
}

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 201;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f0f7ff;
  border-top: 4px solid #1976d2;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-overlay p {
  margin-top: 10px;
  color: #fff;
  font-size: 14px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}
</style>