import { http } from './index';

// ============= 类型定义 =============

/** 套餐信息 */
export interface CourseCollection {
  id: number;
  name: string;
  description?: string;
  packageCount: number;
  gradeLevels?: string[];
  status: string;
  startDate?: string;
  endDate?: string;
}

/** 课程包中的课程项（用于提取课程配置） */
export interface CoursePackageCourseItem {
  id?: number;
  name?: string;
  lessonType?: string;
}

/** 课程包信息 */
export interface CoursePackage {
  id: number;
  name: string;
  description?: string;
  coverImagePath?: string;
  pictureBookName?: string;
  gradeTags: string[];
  domainTags?: string[]; // 不再展示，由课程配置替代
  courses?: CoursePackageCourseItem[]; // 用于课程配置展示
  themeId?: number;
  themeName?: string;
  /** 主题颜色(hex)，来自主题字典 */
  themeColor?: string;
  durationMinutes?: number;
  usageCount?: number;
  avgRating?: number;
  sortOrder?: number;
}

/** 筛选元数据 - 年级选项 */
export interface GradeOption {
  label: string;
  count: number;
}

/** 筛选元数据 - 课程配置选项 */
export interface LessonTypeOption {
  lessonType: string;
  name: string;
  count: number;
}

/** 筛选元数据 - 课程包主题选项 */
export interface ThemeOption {
  themeId: number;
  name: string;
  count: number;
}

/** 筛选元数据响应 */
export interface FilterMetaResponse {
  grades: GradeOption[];
  lessonTypes: LessonTypeOption[];
  themes?: ThemeOption[];
}

// ============= 响应规范化（学校端/教师端共用同一接口，兼容字段形态） =============

function normalizeGradeTags(raw: unknown): string[] {
  if (raw == null) return [];
  if (Array.isArray(raw)) return raw.map(String).filter(Boolean);
  if (typeof raw === 'string' && raw.trim()) {
    const s = raw.trim();
    if (s.startsWith('[')) {
      try {
        const j = JSON.parse(s);
        return Array.isArray(j) ? j.map(String).filter(Boolean) : [];
      } catch {
        /* fallthrough */
      }
    }
    return s.split(',').map((x) => x.trim()).filter(Boolean);
  }
  return [];
}

/** 统一课程包卡片所需字段，避免学校端/代理层返回 snake_case 或嵌套 theme 时主题不显示 */
export function normalizeCoursePackage(raw: any): CoursePackage {
  if (!raw || typeof raw !== 'object') {
    return raw as CoursePackage;
  }
  const nested =
    raw.theme && typeof raw.theme === 'object' ? (raw.theme as Record<string, unknown>) : null;
  const themeName = String(
    raw.themeName ?? raw.theme_name ?? nested?.name ?? ''
  ).trim();
  const themeColor = (raw.themeColor ?? raw.theme_color ?? nested?.color) as string | undefined;
  const themeId = (raw.themeId ?? raw.theme_id ?? nested?.id) as number | undefined;

  return {
    ...raw,
    themeId: themeId ?? raw.themeId,
    themeName: themeName || undefined,
    themeColor: themeColor || undefined,
    gradeTags: normalizeGradeTags(raw.gradeTags ?? raw.grade_tags),
  };
}

// ============= API 接口 =============

/**
 * 获取租户的课程套餐列表
 */
export function getCollections(): Promise<CourseCollection[]> {
  return http.get<CourseCollection[]>('/v1/school/packages');
}

/**
 * 获取套餐下的课程包列表（支持筛选）
 */
export function getPackages(
  collectionId: number,
  params?: {
    grade?: string;
    lessonType?: string;
    themeId?: number;
    keyword?: string;
  }
): Promise<CoursePackage[]> {
  return http
    .get<any[]>(`/v1/school/packages/${collectionId}/packages`, {
      params,
    })
    .then((list) =>
      Array.isArray(list) ? list.map((item) => normalizeCoursePackage(item)) : []
    );
}

/**
 * 获取套餐的筛选元数据
 */
export function getFilterMeta(collectionId: number): Promise<FilterMetaResponse> {
  return http.get<FilterMetaResponse>(`/v1/school/packages/${collectionId}/filter-meta`);
}