/* ==========================================================================
   阅间 · 数据层
   --------------------------------------------------------------------------
   把后端 /api/reading/* 接口封装成前端可直接使用的数据结构。
   设计稿（Design Demo）原本使用 demo-data.js 里的静态示例数据，
   这里替换为真实接口调用，字段名与设计稿保持一致。
   ========================================================================== */
(function (global) {
  'use strict';

  const BASE = '/api/reading';

  async function request(path, params, method = 'GET', body) {
    const url = new URL(BASE + path, global.location.origin);
    Object.entries(params || {}).forEach(([key, value]) => {
      if (value !== undefined && value !== null && value !== '') url.searchParams.set(key, value);
    });
    const response = await fetch(url.toString(), {
      method,
      headers: { Accept: 'application/json', ...(body ? { 'Content-Type': 'application/json' } : {}) },
      ...(body ? { body: JSON.stringify(body) } : {}),
    });
    let payload = null;
    try {
      payload = await response.json();
    } catch (error) {
      payload = null;
    }
    if (!response.ok) {
      const message = (payload && (payload.error || payload.detail)) || `请求失败（${response.status}）`;
      const err = new Error(message);
      err.status = response.status;
      err.payload = payload;
      throw err;
    }
    return payload;
  }

  /* ------------------------------ 工具函数 ------------------------------ */

  function durationText(seconds) {
    const total = Math.max(0, Math.round(Number(seconds) || 0));
    const hours = Math.floor(total / 3600);
    const minutes = Math.round((total % 3600) / 60);
    return hours ? `${hours}小时${minutes}分钟` : `${minutes}分钟`;
  }

  function percentText(value) {
    const num = Number(value) || 0;
    return `${num}%`;
  }

  /* ------------------------------ 接口封装 ------------------------------ */

  const WeApi = {
    durationText,
    percentText,

    status() {
      return request('/status');
    },

    goals() {
      return request('/goals');
    },

    saveGoal(goal, editing = false) {
      return request(editing ? `/goals/${encodeURIComponent(goal.id)}` : '/goals', null, editing ? 'PUT' : 'POST', goal);
    },

    deleteGoal(id) {
      return request(`/goals/${encodeURIComponent(id)}`, null, 'DELETE');
    },

    importGoals(goals) {
      return request('/goals/import', null, 'POST', { goals });
    },

    /**
     * 书架数据
     * @param {string} tab all|reading|done|wish
     * @param {{keyword?:string, limit?:number, offset?:number, progress?:boolean}} options
     */
    shelf(tab, options) {
      const opts = options || {};
      return request('/shelf', {
        tab: tab || 'all',
        keyword: opts.keyword || '',
        limit: opts.limit,
        offset: opts.offset,
        progress: opts.progress ? 1 : 0,
      });
    },

    dashboard(period) {
      return request('/dashboard', { period: period || 'week' });
    },

    notebooks() {
      return request('/notebooks');
    },

    /** bookId 传 'all' 时聚合笔记最多的前 limit 本 */
    notes(bookId, limit) {
      return request('/notes', { book_id: bookId, limit: limit });
    },

    book(bookId) {
      return request('/book/' + encodeURIComponent(bookId));
    },

    reviews(bookId, type, count) {
      return request(`/book/${encodeURIComponent(bookId)}/reviews`, { type: type || 0, count: count || 10 });
    },

    highlights(bookId, chapterUid) {
      return request(`/book/${encodeURIComponent(bookId)}/highlights`, { chapter_uid: chapterUid || 0 });
    },

    underlineThoughts(bookId, chapterUid, range) {
      return request(`/book/${encodeURIComponent(bookId)}/underline-thoughts`, {
        chapter_uid: chapterUid,
        range: range,
      });
    },

    thought(reviewId) {
      return request('/thought/' + encodeURIComponent(reviewId));
    },

    archives() {
      return request('/archives');
    },

    recommend(maxIdx, refresh = false) {
      return request('/recommend', { maxIdx: maxIdx || 0, refresh: refresh ? 1 : 0 });
    },

    search(keyword, scope) {
      return request('/search', { keyword: keyword, scope: scope || 'books' });
    },
  };

  global.WeApi = WeApi;
})(window);