const { PinyinAchievement, PinyinProgress } = require('../../models/pinyin');

/**
 * 获取成就列表
 * GET /api/pinyin/achievements
 */
exports.getAchievements = async (req, res) => {
  try {
    const { type } = req.query;
    
    const query = { isActive: true };
    if (type) query.type = type;
    
    const achievements = await PinyinAchievement.find(query)
      .sort({ order: 1, createdAt: 1 })
      .select('-__v');
    
    res.json({
      code: 0,
      message: 'success',
      data: {
        list: achievements
      }
    });
  } catch (error) {
    console.error('获取成就列表失败:', error);
    res.status(500).json({
      code: 500,
      message: '获取成就列表失败',
      error: error.message
    });
  }
};

/**
 * 获取用户已获得的成就
 * GET /api/pinyin/achievements/my
 */
exports.getMyAchievements = async (req, res) => {
  try {
    const userId = req.user._id;
    
    const progress = await PinyinProgress.findOne({ userId });
    
    if (!progress || !progress.achievements || progress.achievements.length === 0) {
      return res.json({
        code: 0,
        message: 'success',
        data: {
          total: 0,
          list: []
        }
      });
    }
    
    // 获取成就详情
    const achievementCodes = progress.achievements.map(a => a.code);
    const achievements = await PinyinAchievement.find({
      code: { $in: achievementCodes }
    }).select('-__v');
    
    // 合并获得时间
    const achievementsWithTime = achievements.map(ach => {
      const userAch = progress.achievements.find(a => a.code === ach.code);
      return {
        ...ach.toObject(),
        obtainedAt: userAch ? userAch.obtainedAt : null
      };
    });
    
    res.json({
      code: 0,
      message: 'success',
      data: {
        total: achievementsWithTime.length,
        list: achievementsWithTime
      }
    });
  } catch (error) {
    console.error('获取用户成就失败:', error);
    res.status(500).json({
      code: 500,
      message: '获取用户成就失败',
      error: error.message
    });
  }
};

/**
 * 检查成就达成
 * POST /api/pinyin/achievements/check
 */
exports.checkAchievements = async (req, res) => {
  try {
    const userId = req.user._id;
    
    const progress = await PinyinProgress.findOne({ userId });
    if (!progress) {
      return res.json({
        code: 0,
        message: 'success',
        data: {
          newAchievements: []
        }
      });
    }
    
    // 获取所有启用的成就
    const achievements = await PinyinAchievement.find({ isActive: true });
    
    const newAchievements = [];
    
    for (const achievement of achievements) {
      // 检查是否已获得
      if (progress.achievements.some(a => a.code === achievement.code)) {
        continue;
      }
      
      // 检查条件
      const isAchieved = checkCondition(progress, achievement.condition);
      
      if (isAchieved) {
        progress.achievements.push({
          code: achievement.code,
          obtainedAt: new Date()
        });
        
        newAchievements.push({
          code: achievement.code,
          name: achievement.name,
          description: achievement.description,
          icon: achievement.icon,
          reward: achievement.reward
        });
      }
    }
    
    if (newAchievements.length > 0) {
      await progress.save();
    }
    
    res.json({
      code: 0,
      message: 'success',
      data: {
        newAchievements
      }
    });
  } catch (error) {
    console.error('检查成就失败:', error);
    res.status(500).json({
      code: 500,
      message: '检查成就失败',
      error: error.message
    });
  }
};

/**
 * 创建成就（管理员）
 * POST /api/pinyin/achievements
 */
exports.createAchievement = async (req, res) => {
  try {
    const achievementData = req.body;
    
    // 检查code是否已存在
    const existing = await PinyinAchievement.findOne({ code: achievementData.code });
    if (existing) {
      return res.status(400).json({
        code: 400,
        message: '该成就代码已存在'
      });
    }
    
    const achievement = new PinyinAchievement(achievementData);
    await achievement.save();
    
    res.status(201).json({
      code: 0,
      message: '创建成功',
      data: achievement
    });
  } catch (error) {
    console.error('创建成就失败:', error);
    res.status(500).json({
      code: 500,
      message: '创建成就失败',
      error: error.message
    });
  }
};

/**
 * 更新成就（管理员）
 * PUT /api/pinyin/achievements/:id
 */
exports.updateAchievement = async (req, res) => {
  try {
    const { id } = req.params;
    const updateData = req.body;
    
    // 不允许修改code
    delete updateData.code;
    
    const achievement = await PinyinAchievement.findByIdAndUpdate(
      id,
      { $set: updateData },
      { new: true, runValidators: true }
    );
    
    if (!achievement) {
      return res.status(404).json({
        code: 404,
        message: '成就不存在'
      });
    }
    
    res.json({
      code: 0,
      message: '更新成功',
      data: achievement
    });
  } catch (error) {
    console.error('更新成就失败:', error);
    res.status(500).json({
      code: 500,
      message: '更新成就失败',
      error: error.message
    });
  }
};

/**
 * 删除成就（管理员）
 * DELETE /api/pinyin/achievements/:id
 */
exports.deleteAchievement = async (req, res) => {
  try {
    const { id } = req.params;
    
    const achievement = await PinyinAchievement.findByIdAndDelete(id);
    
    if (!achievement) {
      return res.status(404).json({
        code: 404,
        message: '成就不存在'
      });
    }
    
    res.json({
      code: 0,
      message: '删除成功'
    });
  } catch (error) {
    console.error('删除成就失败:', error);
    res.status(500).json({
      code: 500,
      message: '删除成就失败',
      error: error.message
    });
  }
};

/**
 * 检查成就条件
 * @param {Object} progress - 用户进度
 * @param {Object} condition - 条件
 * @returns {Boolean}
 */
function checkCondition(progress, condition) {
  switch (condition.type) {
    case 'explore_count':
      return progress.totalExplored >= condition.value;
    
    case 'collect_count':
      return progress.totalStones >= condition.value;
    
    case 'streak_days':
      return progress.streakDays >= condition.value;
    
    case 'complete_symbol':
      return progress.isSymbolCompleted(condition.symbol);
    
    default:
      return false;
  }
}