/**
 * 为缺失 material_assets 记录的素材补充资产记录
 * 
 * 安全措施：
 * 1. 只处理有 previewUrl 和 zipFilePath 的素材
 * 2. 先验证文件存在性
 * 3. 使用事务确保数据一致性
 * 4. 详细日志记录每一步操作
 */

import { prisma } from '../lib/prisma';
import { access } from 'fs/promises';
import path from 'path';

const ASSET_TYPE = {
  PREVIEW: 'preview',
  ZIP: 'zip',
} as const;

async function checkFileExists(filePath: string): Promise<boolean> {
  try {
    await access(filePath);
    return true;
  } catch {
    return false;
  }
}

async function migrateMissingAssets(dryRun: boolean = true) {
  console.log('========== 迁移缺失的 material_assets 记录 ==========');
  console.log(`模式: ${dryRun ? '🔍 DRY RUN（只分析，不修改）' : '✍️  WRITE（实际修改数据库）'}\n`);

  // 查询所有任务类型的素材
  const taskMaterialTypes = [
    '任务-3D原图',
    '任务-AI原图',
    '任务-实拍原图',
    '任务-视频截图',
    '任务-详情',
  ];

  const materials = await prisma.material.findMany({
    where: {
      materialType: { in: taskMaterialTypes },
      deletedAt: null,
    },
    select: {
      id: true,
      materialType: true,
      productModel: true,
      previewUrl: true,
      zipFileName: true,
      zipFilePath: true,
      zipFileSize: true,
      createdAt: true,
      assets: {
        select: { id: true },
      },
    },
    orderBy: { createdAt: 'asc' },
  });

  console.log(`总共找到 ${materials.length} 个任务类型素材`);

  // 筛选出没有 assets 记录的素材
  const missingAssets = materials.filter(m => m.assets.length === 0);
  console.log(`其中 ${missingAssets.length} 个素材缺失 material_assets 记录\n`);

  if (missingAssets.length === 0) {
    console.log('✅ 所有素材都有完整的 assets 记录！');
    return;
  }

  // 验证每个素材的文件完整性
  const validMaterials: typeof missingAssets = [];
  const invalidMaterials: typeof missingAssets = [];

  console.log('验证文件完整性...\n');

  for (const material of missingAssets) {
    const hasPreviewUrl = !!material.previewUrl && material.previewUrl.trim().length > 0;
    const hasZipFilePath = !!material.zipFilePath && material.zipFilePath.trim().length > 0;

    // 检查预览图 URL 是否有效
    const previewUrlValid = hasPreviewUrl && (
      material.previewUrl.startsWith('http://') ||
      material.previewUrl.startsWith('https://')
    );

    // 检查 zip 文件是否存在
    let zipFileExists = false;
    if (hasZipFilePath) {
      const zipPath = path.join(process.cwd(), material.zipFilePath);
      zipFileExists = await checkFileExists(zipPath);
    }

    const isValid = previewUrlValid && zipFileExists;

    if (isValid) {
      validMaterials.push(material);
      console.log(`✅ ${material.materialType} | ${material.productModel || '(无型号)'}`);
      console.log(`   ID: ${material.id}`);
      console.log(`   预览图: ${material.previewUrl}`);
      console.log(`   ZIP: ${material.zipFilePath} (${(Number(material.zipFileSize) / 1024 / 1024).toFixed(2)} MB)`);
    } else {
      invalidMaterials.push(material);
      console.log(`❌ ${material.materialType} | ${material.productModel || '(无型号)'}`);
      console.log(`   ID: ${material.id}`);
      if (!previewUrlValid) console.log(`   ⚠️  预览图无效或缺失`);
      if (!zipFileExists) console.log(`   ⚠️  ZIP文件不存在: ${material.zipFilePath}`);
    }
    console.log('');
  }

  console.log('='.repeat(80));
  console.log(`\n验证结果:`);
  console.log(`  ✅ 可安全迁移: ${validMaterials.length} 个`);
  console.log(`  ❌ 无法迁移: ${invalidMaterials.length} 个\n`);

  if (validMaterials.length === 0) {
    console.log('没有可迁移的素材。');
    return;
  }

  if (dryRun) {
    console.log('🔍 DRY RUN 模式 - 不会修改数据库');
    console.log('如需实际迁移，请运行: npx tsx scripts/migrate-missing-assets.ts --write\n');
    return;
  }

  // 实际迁移
  console.log('开始迁移...\n');

  let successCount = 0;
  let failCount = 0;

  for (const material of validMaterials) {
    try {
      console.log(`迁移素材: ${material.id} (${material.materialType} | ${material.productModel})`);

      // 使用事务创建资产记录
      await prisma.$transaction(async (tx) => {
        // 创建预览图资产
        await tx.materialAsset.create({
          data: {
            materialId: material.id,
            assetType: ASSET_TYPE.PREVIEW,
            fileUrl: material.previewUrl,
            fileName: 'preview-0.webp',
            sortOrder: 0,
          },
        });

        // 创建 ZIP 资产
        await tx.materialAsset.create({
          data: {
            materialId: material.id,
            assetType: ASSET_TYPE.ZIP,
            fileUrl: material.zipFilePath,
            fileName: material.zipFileName,
            fileSize: material.zipFileSize,
            sortOrder: 0,
          },
        });
      });

      console.log(`  ✅ 成功创建 2 条资产记录（1 预览图 + 1 ZIP）\n`);
      successCount++;
    } catch (error) {
      console.error(`  ❌ 迁移失败:`, error);
      console.log('');
      failCount++;
    }
  }

  console.log('='.repeat(80));
  console.log('\n迁移完成！');
  console.log(`  ✅ 成功: ${successCount} 个`);
  console.log(`  ❌ 失败: ${failCount} 个`);

  if (invalidMaterials.length > 0) {
    console.log(`  ⚠️  跳过: ${invalidMaterials.length} 个（文件缺失或无效）`);
  }

  console.log('\n========== 迁移结束 ==========');
}

// 解析命令行参数
const args = process.argv.slice(2);
const dryRun = !args.includes('--write');

// 执行迁移
migrateMissingAssets(dryRun)
  .then(() => {
    console.log('\n✅ 脚本执行完成');
    process.exit(0);
  })
  .catch((error) => {
    console.error('\n❌ 脚本执行失败:', error);
    process.exit(1);
  });