/**
 * 数据迁移脚本：V1 -> V2
 *
 * 迁移内容：
 * 1. 初始化主题字典（6个默认主题）
 * 2. 为现有课程包创建默认的 CourseLesson（集体课）
 * 3. 迁移 CourseScript → LessonStep
 * 4. 迁移 CourseActivity → CourseLesson（领域课）
 * 5. 创建默认套餐（按年级分组）
 * 6. 迁移租户授权 TenantCourse → TenantPackage
 *
 * 执行命令：npx ts-node prisma/migrate-v1-to-v2.ts
 */

import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

// 默认主题
const DEFAULT_THEMES = [
  { name: '我爱幼儿园', description: '适应幼儿园生活，培养基本生活习惯', sortOrder: 1 },
  { name: '认识自我', description: '认识身体、情绪、能力，建立自我意识', sortOrder: 2 },
  { name: '我的家', description: '了解家庭成员，培养亲情和责任感', sortOrder: 3 },
  { name: '美丽的自然', description: '探索自然现象，培养环保意识', sortOrder: 4 },
  { name: '奇妙的世界', description: '认识社会和世界，拓展视野', sortOrder: 5 },
  { name: '成长的快乐', description: '培养学习兴趣和良好习惯', sortOrder: 6 },
];

// 年级映射
const GRADE_LEVELS = ['小班', '中班', '大班'];

async function main() {
  console.log('开始数据迁移...\n');

  try {
    // ==================== Step 1: 初始化主题字典 ====================
    console.log('Step 1: 初始化主题字典...');
    const existingThemes = await prisma.theme.count();

    if (existingThemes === 0) {
      for (const theme of DEFAULT_THEMES) {
        await prisma.theme.create({
          data: {
            name: theme.name,
            description: theme.description,
            sortOrder: theme.sortOrder,
            status: 'ACTIVE',
          },
        });
      }
      console.log(`  ✅ 已创建 ${DEFAULT_THEMES.length} 个默认主题`);
    } else {
      console.log(`  ⏭️  主题已存在 (${existingThemes} 个)，跳过`);
    }

    // ==================== Step 2: 创建 CourseLesson（集体课）并迁移 CourseScript ====================
    console.log('\nStep 2: 创建 CourseLesson 并迁移 CourseScript...');
    const courses = await prisma.course.findMany({
      where: { isLatest: true },
      include: {
        scripts: {
          orderBy: { sortOrder: 'asc' },
        },
      },
    });

    let lessonCount = 0;
    let stepCount = 0;

    for (const course of courses) {
      // 检查是否已有集体课
      const existingLesson = await prisma.courseLesson.findFirst({
        where: { courseId: course.id, lessonType: 'COLLECTIVE' },
      });

      if (existingLesson) {
        console.log(`  ⏭️  课程 "${course.name}" 已有集体课，跳过`);
        continue;
      }

      // 创建集体课 CourseLesson
      const courseLesson = await prisma.courseLesson.create({
        data: {
          courseId: course.id,
          lessonType: 'COLLECTIVE',
          name: `${course.name} - 集体课`,
          description: course.description,
          duration: course.duration || 25,
          pptPath: course.pptPath,
          pptName: course.pptName,
          objectives: course.lessonPlanData ? JSON.parse(course.lessonPlanData).objectives : null,
          preparation: course.tools || course.studentMaterials,
          sortOrder: 0,
        },
      });
      lessonCount++;

      // 迁移 CourseScript → LessonStep
      for (const script of course.scripts) {
        await prisma.lessonStep.create({
          data: {
            lessonId: courseLesson.id,
            name: script.stepName || `环节 ${script.stepIndex}`,
            content: script.teacherScript,
            duration: script.duration || 5,
            objective: script.objective,
            resourceIds: script.resourceIds,
            sortOrder: script.sortOrder || script.stepIndex,
          },
        });
        stepCount++;
      }

      console.log(`  ✅ 课程 "${course.name}"：创建集体课 + ${course.scripts.length} 个环节`);
    }

    console.log(`  📊 共创建 ${lessonCount} 个集体课，${stepCount} 个教学环节`);

    // ==================== Step 3: 迁移 CourseActivity → CourseLesson（领域课） ====================
    console.log('\nStep 3: 迁移 CourseActivity → CourseLesson（领域课）...');
    const activities = await prisma.courseActivity.findMany({
      include: { course: true },
    });

    // 按课程分组
    const activitiesByCourse = new Map<number, typeof activities>();
    for (const activity of activities) {
      if (!activitiesByCourse.has(activity.courseId)) {
        activitiesByCourse.set(activity.courseId, []);
      }
      activitiesByCourse.get(activity.courseId)!.push(activity);
    }

    let activityLessonCount = 0;

    for (const [courseId, courseActivities] of activitiesByCourse) {
      const course = courseActivities[0].course;

      for (const activity of courseActivities) {
        // 确定课程类型
        let lessonType = 'DOMAIN';
        const domainMap: Record<string, string> = {
          '健康': 'HEALTH',
          '语言': 'LANGUAGE',
          '社会': 'SOCIAL',
          '科学': 'SCIENCE',
          '艺术': 'ART',
        };
        if (activity.domain && domainMap[activity.domain]) {
          lessonType = domainMap[activity.domain];
        }

        // 检查是否已有该类型的领域课
        const existingActivityLesson = await prisma.courseLesson.findFirst({
          where: { courseId, lessonType },
        });

        if (existingActivityLesson) {
          continue;
        }

        await prisma.courseLesson.create({
          data: {
            courseId,
            lessonType,
            name: activity.name,
            description: activity.activityGuide,
            duration: activity.duration || 25,
            objectives: activity.objectives,
            preparation: activity.offlineMaterials,
            extension: activity.onlineMaterials,
            sortOrder: activity.sortOrder || 0,
          },
        });
        activityLessonCount++;
      }

      console.log(`  ✅ 课程 "${course.name}"：创建 ${courseActivities.length} 个领域课`);
    }

    console.log(`  📊 共创建 ${activityLessonCount} 个领域课`);

    // ==================== Step 4: 创建默认套餐（按年级分组） ====================
    console.log('\nStep 4: 创建默认套餐...');
    const existingPackages = await prisma.coursePackage.count();

    if (existingPackages === 0) {
      // 获取所有已发布的课程
      const publishedCourses = await prisma.course.findMany({
        where: { status: 'PUBLISHED' },
      });

      // 年级标签映射（统一格式）
      const gradeTagMap: Record<string, string> = {
        'SMALL': '小班',
        'small': '小班',
        'MIDDLE': '中班',
        'middle': '中班',
        'BIG': '大班',
        'big': '大班',
      };

      // 按年级分组课程
      const coursesByGrade = new Map<string, typeof publishedCourses>();
      for (const course of publishedCourses) {
        let gradeTags: string[] = [];
        try {
          gradeTags = JSON.parse(course.gradeTags || '[]');
        } catch {
          gradeTags = [];
        }

        for (const rawGrade of gradeTags) {
          const grade = gradeTagMap[rawGrade] || rawGrade;
          if (!coursesByGrade.has(grade)) {
            coursesByGrade.set(grade, []);
          }
          coursesByGrade.get(grade)!.push(course);
        }
      }

      // 为每个年级创建套餐
      for (const grade of GRADE_LEVELS) {
        const gradeCourses = coursesByGrade.get(grade) || [];

        if (gradeCourses.length === 0) {
          console.log(`  ⏭️  年级 "${grade}" 没有课程，跳过套餐创建`);
          continue;
        }

        const packageName = `${grade}课程套餐`;
        const coursePackage = await prisma.coursePackage.create({
          data: {
            name: packageName,
            description: `包含 ${gradeCourses.length} 个课程包，覆盖${grade}全学期教学内容`,
            price: gradeCourses.length * 10000, // 假设每个课程包 100 元
            gradeLevels: JSON.stringify([grade]),
            status: 'PUBLISHED',
            courseCount: gradeCourses.length,
            publishedAt: new Date(),
          },
        });

        // 创建套餐-课程关联
        for (let i = 0; i < gradeCourses.length; i++) {
          const course = gradeCourses[i];
          await prisma.coursePackageCourse.create({
            data: {
              packageId: coursePackage.id,
              courseId: course.id,
              gradeLevel: grade,
              sortOrder: i,
            },
          });
        }

        console.log(`  ✅ 创建套餐 "${packageName}"：包含 ${gradeCourses.length} 个课程包`);
      }
    } else {
      console.log(`  ⏭️  套餐已存在 (${existingPackages} 个)，跳过`);
    }

    // ==================== Step 5: 迁移租户授权 TenantCourse → TenantPackage ====================
    console.log('\nStep 5: 迁移租户授权...');

    // 年级标签映射（统一格式）
    const gradeTagMapForAuth: Record<string, string> = {
      'SMALL': '小班',
      'small': '小班',
      'MIDDLE': '中班',
      'middle': '中班',
      'BIG': '大班',
      'big': '大班',
    };

    // 获取所有套餐
    const packages = await prisma.coursePackage.findMany();
    const packageByGrade = new Map<string, typeof packages[0]>();
    for (const pkg of packages) {
      const grades = JSON.parse(pkg.gradeLevels || '[]');
      for (const grade of grades) {
        packageByGrade.set(grade, pkg);
      }
    }

    // 获取租户课程授权
    const tenantCourses = await prisma.tenantCourse.findMany({
      include: { course: true, tenant: true },
    });

    // 按租户分组
    const tenantCoursesByTenant = new Map<number, typeof tenantCourses>();
    for (const tc of tenantCourses) {
      if (!tenantCoursesByTenant.has(tc.tenantId)) {
        tenantCoursesByTenant.set(tc.tenantId, []);
      }
      tenantCoursesByTenant.get(tc.tenantId)!.push(tc);
    }

    let tenantPackageCount = 0;

    for (const [tenantId, tcs] of tenantCoursesByTenant) {
      const tenant = tcs[0].tenant;

      // 获取该租户需要的套餐
      const neededPackages = new Set<typeof packages[0]>();
      for (const tc of tcs) {
        const gradeTags = JSON.parse(tc.course.gradeTags || '[]');
        for (const rawGrade of gradeTags) {
          const grade = gradeTagMapForAuth[rawGrade] || rawGrade;
          const pkg = packageByGrade.get(grade);
          if (pkg) {
            neededPackages.add(pkg);
          }
        }
      }

      // 为租户创建套餐授权
      for (const pkg of neededPackages) {
        // 检查是否已有授权
        const existingAuth = await prisma.tenantPackage.findFirst({
          where: { tenantId, packageId: pkg.id },
        });

        if (existingAuth) {
          continue;
        }

        // 使用租户的订阅日期
        const startDate = tenant.startDate || new Date().toISOString().split('T')[0];
        const endDate = tenant.expireDate || new Date(Date.now() + 365 * 24 * 60 * 60 * 1000).toISOString().split('T')[0];

        await prisma.tenantPackage.create({
          data: {
            tenantId,
            packageId: pkg.id,
            startDate,
            endDate,
            status: 'ACTIVE',
            pricePaid: pkg.price,
          },
        });
        tenantPackageCount++;
      }

      console.log(`  ✅ 租户 "${tenant.name}"：授权 ${neededPackages.size} 个套餐`);
    }

    console.log(`  📊 共创建 ${tenantPackageCount} 个租户套餐授权`);

    // ==================== 完成 ====================
    console.log('\n✅ 数据迁移完成！');

    // 输出统计信息
    const stats = {
      themes: await prisma.theme.count(),
      courses: await prisma.course.count({ where: { isLatest: true } }),
      courseLessons: await prisma.courseLesson.count(),
      lessonSteps: await prisma.lessonStep.count(),
      packages: await prisma.coursePackage.count(),
      tenantPackages: await prisma.tenantPackage.count(),
    };

    console.log('\n📊 迁移后数据统计：');
    console.log(`   主题：${stats.themes}`);
    console.log(`   课程包：${stats.courses}`);
    console.log(`   课程（CourseLesson）：${stats.courseLessons}`);
    console.log(`   教学环节：${stats.lessonSteps}`);
    console.log(`   套餐：${stats.packages}`);
    console.log(`   租户套餐授权：${stats.tenantPackages}`);

  } catch (error) {
    console.error('❌ 迁移失败：', error);
    throw error;
  }
}

main()
  .catch((error) => {
    console.error(error);
    process.exit(1);
  })
  .finally(async () => {
    await prisma.$disconnect();
  });