import type { MetaFunction, LoaderFunctionArgs, ActionFunctionArgs } from '@remix-run/node';
import { redirect } from '@remix-run/node';
import { useLoaderData, useNavigate, useSubmit, useActionData } from '@remix-run/react';
import { useState, useEffect } from 'react';
import { getContractTemplate } from '~/api/contract-template/templates';
import type { ContractTemplate } from '~/api/contract-template/templates';
import styles from '~/styles/pages/contract-template.css?url';
import filePreviewStyles from '~/styles/components/file-preview-isolation.css?url';
import { getUserSession } from '~/api/login/auth.server';
import { createDraftContract } from '~/api/contracts/draft-service.server';
import { apiRequest, downloadFile } from '~/api/axios-client';
import { checkRoutePermission } from '~/api/auth/check-route-permission.server';

// 导入FilePreview组件
import { FilePreview } from '~/components/reviews';
import { toastService } from '~/components/ui/Toast';

export const links = () => [
  { rel: 'stylesheet', href: styles },
  { rel: 'stylesheet', href: filePreviewStyles },
];

export const meta: MetaFunction<typeof loader> = ({ data }) => {
  return [
    { title: `${data?.template.title || '模板详情'} - 合同管理 - 智慧法务` },
    { 
      name: 'description', 
      content: data?.template.description || '查看合同管理模块中的模板详细信息' 
    }
  ];
};

// 面包屑导航配置
export const handle = {
  breadcrumb: (data: { template: { title: string } }) => {
    return data?.template?.title || "模板详情";
  }
};

export async function loader({ params, request }: LoaderFunctionArgs) {
  const templateId = params.id!;

  // 获取 JWT
  const { frontendJWT } = await getUserSession(request);
  const jwt = frontendJWT || undefined;

  try {
    const response = await getContractTemplate(templateId, jwt);

      if (response.error) {
        throw new Response(response.error, { status: response.status || 404 });
      }

      if (!response.data) {
        throw new Response('模板未找到', { status: 404 });
      }

    // 添加调试信息
    // console.log('模板详情数据:', response.data);
    // console.log('分类信息:', response.data.category);

    return { template: response.data };
  } catch (error) {
    console.error('加载模板详情失败:', error);
    throw new Response('模板未找到', { status: 404 });
  }
}

/**
 * Action 函数：处理起草合同请求
 */
export async function action({ request, params }: ActionFunctionArgs) {
  const templateId = params.id!;

  if (!templateId) {
    return Response.json({ error: '模板ID无效' }, { status: 400 });
  }

  // 获取用户信息和JWT
  const { userInfo, frontendJWT, userRole } = await getUserSession(request);
  if (!userInfo?.sub) {
    return Response.json({ error: '未登录' }, { status: 401 });
  }

  // 🔒 在执行任何操作之前，先检查用户是否有权限访问目标路由
  const targetPath = '/contract-draft';
  const permissionCheck = await checkRoutePermission(targetPath, userRole, frontendJWT || undefined);

  if (!permissionCheck.allowed) {
    console.warn(`[Action] 用户无权访问 ${targetPath}:`, permissionCheck.error);
    return Response.json({ error: permissionCheck.error || '您没有权限使用起草合同功能' }, { status: 403 });
  }

  try {
    // 解析表单数据
    const formData = await request.formData();
    const title = formData.get('title') as string;
    const originalFilePath = formData.get('originalFilePath') as string;

    if (!title) {
      return Response.json({ error: '标题不能为空' }, { status: 400 });
    }

    if (!originalFilePath) {
      return Response.json({ error: '文件路径不存在' }, { status: 400 });
    }

    // 生成新文件路径
    const area = userInfo.area || 'unknown';
    const timestamp = Date.now();
    const uuid = crypto.randomUUID();

    // 提取文件目录和文件名
    const lastSlashIndex = originalFilePath.lastIndexOf('/');
    const directory = lastSlashIndex >= 0 ? originalFilePath.substring(0, lastSlashIndex) : '';
    const fileName = lastSlashIndex >= 0 ? originalFilePath.substring(lastSlashIndex + 1) : originalFilePath;

    // 提取文件扩展名
    const lastDotIndex = fileName.lastIndexOf('.');
    const baseName = lastDotIndex >= 0 ? fileName.substring(0, lastDotIndex) : fileName;
    const extension = lastDotIndex >= 0 ? fileName.substring(lastDotIndex) : '';

    // 构建新文件名
    const newFileName = `${baseName}_${area}_${timestamp}_${uuid}${extension}`;
    const newFilePath = directory ? `${directory}/${newFileName}` : newFileName;

    console.log('[Draft] 复制文件:', { originalFilePath, newFilePath });

    // 调用 MinIO 复制文件 API（需要传递 JWT）
    const jwt = frontendJWT || undefined;
    const copyResponse = await apiRequest('/api/v2/storage/files/copy', {
      method: 'POST',
      data: {
        source_path: originalFilePath,
        destination_path: newFilePath
      },
      headers: {
        'Authorization': jwt ? `Bearer ${jwt}` : ''
      }
    });

    if (copyResponse.error) {
      console.error('[Draft] 文件复制失败:', copyResponse.error);
      return Response.json({ error: `文件复制失败: ${copyResponse.error}` }, { status: 500 });
    }

    console.log('[Draft] 文件复制成功:');
    // console.log('[Draft] 文件复制成功:', copyResponse.data);

    // 重定向到草稿编辑页面，通过 URL 参数传递文件路径和模板 ID
    const draftUrl = `/contract-draft/1?filePath=${encodeURIComponent(newFilePath)}&templateId=${templateId}&title=${encodeURIComponent(title)}`;
    return redirect(draftUrl);
  } catch (error) {
    console.error('[Template Detail] 创建草稿失败:', error);
    return Response.json(
      { error: error instanceof Error ? error.message : '创建草稿失败' },
      { status: 500 }
    );
  }
}

// Action 返回的数据类型
interface ActionData {
  error?: string;
}

export default function ContractTemplateDetail() {
  const { template }: { template: ContractTemplate } = useLoaderData<typeof loader>();
  const actionData = useActionData<ActionData>();
  const navigate = useNavigate();
  const submit = useSubmit();
  const [isCreatingDraft, setIsCreatingDraft] = useState(false);
  // 注释掉收藏功能
  // const [isFavorited, setIsFavorited] = useState(false);

  // 防止页面加载时自动滚动到预览区域（由 Collabora iframe 的 tabIndex 导致）
  useEffect(() => {
    // 页面加载后立即滚动回顶部
    window.scrollTo({ top: 0, behavior: 'instant' });
  }, []);

  // 处理 action 返回的错误
  useEffect(() => {
    if (actionData?.error) {
      toastService.error(actionData.error);
      setIsCreatingDraft(false);
    }
  }, [actionData]);

  const handleBack = () => {
    navigate('/contract-template/list');
  };

  // 使用统一的下载方法（与 rules-files.tsx 相同）
  const handleDownload = async () => {

    if (!template.file_path) {
      toastService.error('文件路径不存在，无法下载');
      return;
    }

    try {
      // 使用axios封装的下载方法
      const blob = await downloadFile(template.file_path);


      // 创建Blob URL
      const blobUrl = URL.createObjectURL(blob);

      // 清理文件名，移除可能导致问题的字符
      const fileExtension = template.file_format || 'docx';
      const fileName = `${template.title}.${fileExtension}`;
      const cleanFileName = fileName.replace(/[<>:"/\\|?*]/g, '_');

      // 创建一个隐藏的a标签并点击它
      const a = document.createElement('a');
      a.style.display = 'none';
      a.href = blobUrl;
      a.download = cleanFileName;
      document.body.appendChild(a);
      a.click();

      // 清理
      setTimeout(() => {
        document.body.removeChild(a);
        URL.revokeObjectURL(blobUrl);
      }, 100);
    } catch (error) {
      console.error('下载文件失败:', error);
      toastService.error(`下载文件失败: ${error instanceof Error ? error.message : '未知错误'}`);
    }
  };

  const handlePreview = () => {
    // console.log('预览模板:', template.id);
    // 页面内预览，滚动到预览区域
    const previewElement = document.getElementById('template-preview');
    if (previewElement) {
      previewElement.scrollIntoView({ behavior: 'smooth' });
    }
  };

  // 起草合同
  const handleStartDraft = () => {
    if (isCreatingDraft) return;

    if (!template.file_path) {
      toastService.error('模板文件路径不存在，无法起草');
      return;
    }

    // 生成默认标题
    const defaultTitle = `${template.title}-${new Date().toLocaleDateString('zh-CN').replace(/\//g, '')}`;

    setIsCreatingDraft(true);

    // 使用 Remix 的 submit 提交表单
    const formData = new FormData();
    formData.append('title', defaultTitle);
    formData.append('originalFilePath', template.file_path);

    submit(formData, { method: 'post' });
  };

  /* const handleFavorite = () => {
    setIsFavorited(!isFavorited);
    console.log('收藏状态:', !isFavorited);
  }; */

  /* const handleShare = () => {
    // 复制当前页面URL到剪贴板
    navigator.clipboard.writeText(window.location.href).then(() => {
      alert('链接已复制到剪贴板');
    }).catch(() => {
      alert('复制失败，请手动复制链接');
    });
  }; */

  // 注释掉评分相关功能
  /* const renderStars = (rating: number) => {
    const stars = [];
    const fullStars = Math.floor(rating);
    
    for (let i = 0; i < 5; i++) {
      if (i < fullStars) {
        stars.push(<i key={i} className="ri-star-fill"></i>);
      } else {
        stars.push(<i key={i} className="ri-star-line"></i>);
      }
    }
    return stars;
  }; */

  // 创建文件内容对象用于FilePreview组件
  // 优先使用原始文件路径（支持docx），如果没有则使用pdf_file_path
  const previewPath = template.file_path || template.pdf_file_path;
  const fileContent = previewPath ? {
    title: template.title,
    contractNumber: template.template_code,
    // 使用file_path以支持多种格式（docx/pdf）
    path: previewPath,
    parties: {
      partyA: {
        name: '',
        address: '',
        representative: '',
        phone: ''
      },
      partyB: {
        name: '',
        address: '',
        representative: '',
        phone: ''
      }
    },
    sections: []
  } : null;

  return (
    <div className="contract-search-results">
      {/* 返回按钮 */}
      <div className="mb-6">
        <button 
          onClick={handleBack}
          className="flex items-center px-3 py-2 text-sm border border-gray-200 rounded-lg hover:border-primary-color transition-colors"
        >
          <i className="ri-arrow-left-line mr-2"></i>
          返回列表
        </button>
      </div>

      {/* 模板详情 */}
      <div className="template-detail max-w-4xl mx-auto">
        {/* 详情头部 */}
        <div className="detail-header bg-white rounded-xl p-8 mb-6 border border-gray-100">
          {/* 注释掉类型和评分显示 */}
          {/* <div className="flex justify-between items-start mb-4">
            <div className="template-type">{template.type}</div>
            <div className="flex items-center gap-2">
              <div className="flex items-center gap-1 text-yellow-500">
                {renderStars(template.rating)}
                <span className="text-sm ml-1">{template.rating} (156评价)</span>
              </div>
            </div>
          </div> */}
          
          <h1 className="detail-title text-3xl font-semibold mb-6">{template.title}</h1>
          
          <div className="detail-meta grid grid-cols-2 md:grid-cols-3 gap-4 mb-6">
            <div className="meta-item">
              <span className="meta-label text-gray-500">模板编号：</span>
              <span>{template.template_code}</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">更新时间：</span>
              <span>{new Date(template.updated_at).toLocaleDateString('zh-CN')}</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">所属分类：</span>
              <span>{template.category?.name || '其他'}</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">文件格式：</span>
              <span>{template.file_format?.toUpperCase()}</span>
            </div>
            {template.is_featured && (
              <div className="meta-item">
                <span className="meta-label text-gray-500">特色推荐：</span>
                <span className="text-primary">是</span>
              </div>
            )}
            {/* 注释掉使用次数、文件大小、适用范围、法律依据等字段 */}
            {/* <div className="meta-item">
              <span className="meta-label text-gray-500">使用次数：</span>
              <span>{template.useCount.toLocaleString()}次</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">文件大小：</span>
              <span>{template.fileSize}</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">适用范围：</span>
              <span>{template.scope}</span>
            </div>
            <div className="meta-item">
              <span className="meta-label text-gray-500">法律依据：</span>
              <span>{template.legalBasis}</span>
            </div> */}
          </div>
          
          <div className="detail-actions flex gap-3">
            <button
              className="detail-btn primary bg-primary text-white px-6 py-3 rounded-lg flex items-center gap-2 hover:bg-primary-hover"
              onClick={handleStartDraft}
              disabled={isCreatingDraft}
            >
              {isCreatingDraft ? (
                <>
                  <i className="ri-loader-4-line animate-spin"></i>
                  创建中...
                </>
              ) : (
                <>
                  <i className="ri-edit-line"></i>
                  起草合同
                </>
              )}
            </button>
            <button
              className="detail-btn secondary bg-white border border-gray-200 px-6 py-3 rounded-lg flex items-center gap-2 hover:border-primary"
              onClick={handleDownload}
            >
              <i className="ri-download-line"></i>
              下载模板
            </button>
            {template.pdf_file_path && (
              <button
                className="detail-btn secondary bg-white border border-gray-200 px-6 py-3 rounded-lg flex items-center gap-2 hover:border-primary"
                onClick={handlePreview}
              >
                <i className="ri-eye-line"></i>
                在线预览
              </button>
            )}
            {/* 注释掉收藏功能 */}
            {/* <button 
              className={`detail-btn secondary bg-white border border-gray-200 px-6 py-3 rounded-lg flex items-center gap-2 hover:border-primary ${isFavorited ? 'text-yellow-500' : ''}`}
              onClick={handleFavorite}
            >
              <i className={isFavorited ? 'ri-star-fill' : 'ri-star-line'}></i>
              收藏模板
            </button> */}
            {/* <button 
              className="detail-btn secondary bg-white border border-gray-200 px-6 py-3 rounded-lg flex items-center gap-2 hover:border-primary"
              onClick={handleShare}
            >
              <i className="ri-share-line"></i>
              分享
            </button> */}
          </div>
        </div>
        
        {/* 详情内容 */}
        <div className="detail-content bg-white rounded-xl p-8 border border-gray-100">
          {/* 模板简介 */}
          <div className="content-section mb-8">
            <h3 className="section-title text-xl font-semibold mb-4">模板简介</h3>
            <p className="text-gray-600 leading-relaxed">
              {template.description || '该合同模板为标准格式，包含完整的合同条款结构，适用于相关业务场景的合同签署。'}
              {template.category?.description && (
                <>
                  <br /><br />
                  <strong>适用范围：</strong>{template.category.description}
                </>
              )}
            </p>
          </div>
          
          {/* 注释掉主要特点模块 */}
          {/* <div className="content-section mb-8">
            <h3 className="section-title text-xl font-semibold mb-4">主要特点</h3>
            <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
              {template.features.map((feature, index) => (
                <div key={index} className={`bg-${feature.color}-50 p-4 rounded-lg border border-${feature.color}-200`}>
                  <div className="flex items-center mb-2">
                    <i className={`${feature.icon} text-${feature.color}-600 mr-2`}></i>
                    <span className="font-medium">{feature.title}</span>
                  </div>
                  <p className="text-sm text-gray-600">{feature.description}</p>
                </div>
              ))}
            </div>
          </div> */}
          
          {/* 注释掉合同条款结构模块 */}
          {/* <div className="content-section mb-8">
            <h3 className="section-title text-xl font-semibold mb-4">合同条款结构</h3>
            <div className="space-y-3">
              {template.structure.map((item) => (
                <div key={item.step} className="flex items-center p-3 bg-gray-50 rounded-lg">
                  <div className="w-8 h-8 bg-primary text-white rounded-full flex items-center justify-center text-sm font-medium mr-3">
                    {item.step}
                  </div>
                  <div>
                    <div className="font-medium">{item.title}</div>
                    <div className="text-sm text-gray-600">{item.description}</div>
                  </div>
                </div>
              ))}
            </div>
          </div> */}
          
          {/* 合同预览 - 只有当存在pdf_file_path时才显示 */}
          {fileContent && (
            <div className="content-section mb-8">
              <h3 className="section-title text-xl font-semibold mb-4">合同预览</h3>
              <div className="border border-gray-200 rounded-lg overflow-hidden">
                <div
                  className="file-preview-isolation w-full"
                >
                  <FilePreview 
                    fileContent={fileContent}
                    activeReviewPointResultId={null}
                    targetPage={undefined}
                    isStructuredView={false}
                    isTemplate={true}
                  />
                </div>
              </div>
            </div>
          )}
          
          {/* 注释掉用户评价模块 */}
          {/* <div className="content-section">
            <h3 className="section-title text-xl font-semibold mb-4">用户评价</h3>
            <div className="space-y-4">
              {template.reviews.map((review, index) => (
                <div key={index} className="border border-gray-200 rounded-lg p-4">
                  <div className="flex items-center justify-between mb-2">
                    <div className="flex items-center gap-2">
                      <div className="w-8 h-8 bg-blue-500 text-white rounded-full flex items-center justify-center text-sm font-medium">
                        {review.user[0]}
                      </div>
                      <span className="font-medium">{review.user}</span>
                      <div className="flex items-center gap-1 text-yellow-500">
                        {renderStars(review.rating)}
                      </div>
                    </div>
                    <span className="text-sm text-gray-500">{review.date}</span>
                  </div>
                  <p className="text-gray-600">{review.comment}</p>
                </div>
              ))}
            </div>
          </div> */}
        </div>
      </div>
    </div>
  );
}