// pages/read/read.js
const chapterApi = require('../../api/chapter');
const historyApi = require('../../api/history');
const userUtil = require('../../utils/user');

Page({
  data: {
    contentId: null,
    chapterId: null,
    chapter: null,
    chapters: [],
    currentIndex: 0,
    fontSize: 32, // 字体大小（rpx）
    backgroundColor: '#fff', // 背景颜色
    loading: true,
    showSettings: false
  },

  onLoad(options) {
    const contentId = parseInt(options.contentId);
    const chapterId = parseInt(options.chapterId);
    
    if (!contentId || !chapterId) {
      wx.showToast({
        title: '参数错误',
        icon: 'none'
      });
      setTimeout(() => {
        wx.navigateBack();
      }, 1500);
      return;
    }

    this.setData({ contentId, chapterId });
    this.loadChapters();
    this.loadChapter();
  },

  // 加载章节列表
  async loadChapters() {
    try {
      const chapters = await chapterApi.getBookChapterList(this.data.contentId);
      const currentIndex = chapters.findIndex(c => c.chapterId === this.data.chapterId);
      this.setData({ 
        chapters,
        currentIndex: currentIndex >= 0 ? currentIndex : 0
      });
    } catch (error) {
      console.error('加载章节列表失败:', error);
    }
  },

  // 加载章节内容
  async loadChapter() {
    this.setData({ loading: true });
    try {
      const chapter = await chapterApi.getBookChapter(this.data.chapterId);
      this.setData({ chapter });
      wx.setNavigationBarTitle({
        title: chapter.chapterTitle || '阅读'
      });
      
      // 保存阅读历史
      this.saveHistory();
    } catch (error) {
      wx.showToast({
        title: error || '加载失败',
        icon: 'none'
      });
    } finally {
      this.setData({ loading: false });
    }
  },
  
  // 保存阅读历史
  async saveHistory() {
    if (!userUtil.isLogin() || !this.data.contentId) {
      return;
    }
    try {
      await historyApi.addHistory(this.data.contentId);
    } catch (error) {
      console.error('保存阅读历史失败:', error);
      // 静默失败，不影响阅读体验
    }
  },

  // 上一章
  prevChapter() {
    if (this.data.currentIndex > 0) {
      const prevChapter = this.data.chapters[this.data.currentIndex - 1];
      this.setData({
        chapterId: prevChapter.chapterId,
        currentIndex: this.data.currentIndex - 1
      });
      this.loadChapter();
    } else {
      wx.showToast({
        title: '已经是第一章了',
        icon: 'none'
      });
    }
  },

  // 下一章
  nextChapter() {
    if (this.data.currentIndex < this.data.chapters.length - 1) {
      const nextChapter = this.data.chapters[this.data.currentIndex + 1];
      this.setData({
        chapterId: nextChapter.chapterId,
        currentIndex: this.data.currentIndex + 1
      });
      this.loadChapter();
    } else {
      wx.showToast({
        title: '已经是最后一章了',
        icon: 'none'
      });
    }
  },

  // 显示/隐藏设置
  toggleSettings() {
    this.setData({
      showSettings: !this.data.showSettings
    });
  },

  // 调整字体大小
  adjustFontSize(e) {
    const size = parseInt(e.detail.value);
    this.setData({ fontSize: size * 2 + 28 }); // 28-48
  },

  // 切换背景色
  changeBackground(e) {
    const color = e.currentTarget.dataset.color;
    this.setData({ backgroundColor: color });
  },

  // 显示目录
  showChapterList() {
    const itemList = this.data.chapters.map((item, index) => 
      `${index + 1}. ${item.chapterTitle}`
    );
    
    wx.showActionSheet({
      itemList,
      success: (res) => {
        const chapter = this.data.chapters[res.tapIndex];
        this.setData({
          chapterId: chapter.chapterId,
          currentIndex: res.tapIndex
        });
        this.loadChapter();
      }
    });
  }
});