const asyncHandler = require('express-async-handler');
const PromptGroup = require('../models/PromptGroup');
const logger = require('../utils/logger');

// @desc    获取所有提示词组
// @route   GET /api/prompt-groups
// @access  Private
const getPromptGroups = asyncHandler(async (req, res) => {
  const promptGroups = await PromptGroup.find({})
    .populate('category', 'name color')
    .sort({ updatedAt: -1 });
  
  res.json(promptGroups);
});

// @desc    获取单个提示词组
// @route   GET /api/prompt-groups/:id
// @access  Private
const getPromptGroupById = asyncHandler(async (req, res) => {
  const promptGroup = await PromptGroup.findById(req.params.id)
    .populate('category', 'name color');

  if (promptGroup) {
    res.json(promptGroup);
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    创建提示词组
// @route   POST /api/prompt-groups
// @access  Private
const createPromptGroup = asyncHandler(async (req, res) => {
  const { name, description, category } = req.body;

  const promptGroup = await PromptGroup.create({
    name,
    description,
    category,
    prompts: [],
    workflows: [],
    dslFiles: [],
    createdBy: req.user._id,
  });

  if (promptGroup) {
    res.status(201).json(promptGroup);
  } else {
    res.status(400);
    throw new Error('无效的提示词组数据');
  }
});

// @desc    更新提示词组
// @route   PUT /api/prompt-groups/:id
// @access  Private
const updatePromptGroup = asyncHandler(async (req, res) => {
  const { name, description, category } = req.body;

  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    promptGroup.name = name || promptGroup.name;
    promptGroup.description = description || promptGroup.description;
    promptGroup.category = category || promptGroup.category;

    const updatedPromptGroup = await promptGroup.save();
    res.json(updatedPromptGroup);
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    删除提示词组
// @route   DELETE /api/prompt-groups/:id
// @access  Private
const deletePromptGroup = asyncHandler(async (req, res) => {
  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    await promptGroup.deleteOne();
    res.json({ message: '提示词组已删除' });
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    添加提示词到提示词组
// @route   POST /api/prompt-groups/:id/prompts
// @access  Private
const addPromptToGroup = asyncHandler(async (req, res) => {
  const { title, content, tags } = req.body;

  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    const newPrompt = {
      title,
      content,
      tags: tags || [],
      createdAt: new Date(),
      updatedAt: new Date(),
    };

    promptGroup.prompts.push(newPrompt);
    promptGroup.updatedAt = new Date();

    const updatedPromptGroup = await promptGroup.save();
    res.status(201).json(updatedPromptGroup.prompts[updatedPromptGroup.prompts.length - 1]);
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    更新提示词
// @route   PUT /api/prompt-groups/:id/prompts/:promptId
// @access  Private
const updatePrompt = asyncHandler(async (req, res) => {
  const { title, content, tags } = req.body;

  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    const promptIndex = promptGroup.prompts.findIndex(
      (p) => p._id.toString() === req.params.promptId
    );

    if (promptIndex !== -1) {
      promptGroup.prompts[promptIndex].title = title || promptGroup.prompts[promptIndex].title;
      promptGroup.prompts[promptIndex].content = content || promptGroup.prompts[promptIndex].content;
      promptGroup.prompts[promptIndex].tags = tags || promptGroup.prompts[promptIndex].tags;
      promptGroup.prompts[promptIndex].updatedAt = new Date();
      promptGroup.updatedAt = new Date();

      const updatedPromptGroup = await promptGroup.save();
      res.json(updatedPromptGroup.prompts[promptIndex]);
    } else {
      res.status(404);
      throw new Error('提示词未找到');
    }
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    删除提示词
// @route   DELETE /api/prompt-groups/:id/prompts/:promptId
// @access  Private
const deletePrompt = asyncHandler(async (req, res) => {
  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    const promptExists = promptGroup.prompts.some(
      (p) => p._id.toString() === req.params.promptId
    );

    if (promptExists) {
      promptGroup.prompts = promptGroup.prompts.filter(
        (p) => p._id.toString() !== req.params.promptId
      );
      promptGroup.updatedAt = new Date();

      await promptGroup.save();
      res.json({ message: '提示词已删除' });
    } else {
      res.status(404);
      throw new Error('提示词未找到');
    }
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

// @desc    添加DSL文件到提示词组 - 修改为支持文本内容
// @route   POST /api/prompt-groups/:id/dsl-files
// @access  Private
const addDslFileToGroup = asyncHandler(async (req, res) => {
  try {
    const { name, content, fileData, mimeType } = req.body;
    logger.info(`正在添加DSL文件: ${name}`);
    
    // 验证请求数据
    if (!name) {
      res.status(400);
      throw new Error('文件名是必需的');
    }

    // 确保至少提供了文本内容或文件数据中的一个
    if (!content && !fileData) {
      res.status(400);
      throw new Error('请提供YAML内容或上传文件');
    }
    
    const promptGroup = await PromptGroup.findById(req.params.id);

    if (!promptGroup) {
      res.status(404);
      throw new Error('提示词组未找到');
    }
    
    // 确保文件名以 .yml 结尾
    let fileName = name;
    if (!fileName.toLowerCase().endsWith('.yml')) {
      fileName = fileName.replace(/\.[^/.]+$/, '') + '.yml';
    }
    
    // 处理内容: 优先使用提供的内容，如果没有则尝试解码文件数据
    let yamlContent = content;
    
    // 如果提供了fileData但没有提供content，尝试将fileData转换为文本
    if (!yamlContent && fileData) {
      try {
        // 尝试将Base64解码为文本
        const buffer = Buffer.from(fileData, 'base64');
        yamlContent = buffer.toString('utf-8');
        logger.info(`成功从文件数据提取YAML内容`);
      } catch (error) {
        logger.error(`从文件数据提取内容失败: ${error.message}`);
        res.status(400);
        throw new Error('无法从上传的文件中提取内容');
      }
    }

    const newDslFile = {
      name: fileName,
      content: yamlContent,
      mimeType: mimeType || 'application/x-yaml',
      uploadedAt: new Date(),
    };

    promptGroup.dslFiles.push(newDslFile);
    promptGroup.updatedAt = new Date();

    const updatedPromptGroup = await promptGroup.save();
    logger.info(`DSL文件添加成功: ${fileName}`);
    
    res.status(201).json(updatedPromptGroup.dslFiles[updatedPromptGroup.dslFiles.length - 1]);
  } catch (error) {
    logger.error(`添加DSL文件时出错: ${error.message}`);
    if (!res.statusCode || res.statusCode === 200) {
      res.status(500);
    }
    throw error;
  }
});

// @desc    更新DSL文件
// @route   PUT /api/prompt-groups/:id/dsl-files/:fileId
// @access  Private
const updateDslFile = asyncHandler(async (req, res) => {
  try {
    const { name, content } = req.body;
    
    if (!name && !content) {
      res.status(400);
      throw new Error('请提供要更新的文件名或内容');
    }
    
    const promptGroup = await PromptGroup.findById(req.params.id);

    if (!promptGroup) {
      res.status(404);
      throw new Error('提示词组未找到');
    }
    
    const fileIndex = promptGroup.dslFiles.findIndex(
      file => file._id.toString() === req.params.fileId
    );
    
    if (fileIndex === -1) {
      res.status(404);
      throw new Error('DSL文件未找到');
    }
    
    // 更新文件名 - 确保以.yml结尾
    if (name) {
      let updatedName = name;
      if (!updatedName.toLowerCase().endsWith('.yml')) {
        updatedName = updatedName.replace(/\.[^/.]+$/, '') + '.yml';
      }
      promptGroup.dslFiles[fileIndex].name = updatedName;
    }
    
    // 更新内容
    if (content) {
      promptGroup.dslFiles[fileIndex].content = content;
    }
    
    // 更新时间戳
    promptGroup.dslFiles[fileIndex].uploadedAt = new Date();
    promptGroup.updatedAt = new Date();
    
    const updatedPromptGroup = await promptGroup.save();
    logger.info(`DSL文件更新成功: ${promptGroup.dslFiles[fileIndex].name}`);
    
    res.status(200).json(updatedPromptGroup.dslFiles[fileIndex]);
  } catch (error) {
    logger.error(`更新DSL文件时出错: ${error.message}`);
    if (!res.statusCode || res.statusCode === 200) {
      res.status(500);
    }
    throw error;
  }
});

// @desc    删除DSL文件
// @route   DELETE /api/prompt-groups/:id/dsl-files/:fileId
// @access  Private
const deleteDslFile = asyncHandler(async (req, res) => {
  const promptGroup = await PromptGroup.findById(req.params.id);

  if (promptGroup) {
    const fileExists = promptGroup.dslFiles.some(
      (f) => f._id.toString() === req.params.fileId
    );

    if (fileExists) {
      promptGroup.dslFiles = promptGroup.dslFiles.filter(
        (f) => f._id.toString() !== req.params.fileId
      );
      promptGroup.updatedAt = new Date();

      await promptGroup.save();
      res.json({ message: 'DSL文件已删除' });
    } else {
      res.status(404);
      throw new Error('DSL文件未找到');
    }
  } else {
    res.status(404);
    throw new Error('提示词组未找到');
  }
});

module.exports = {
  getPromptGroups,
  getPromptGroupById,
  createPromptGroup,
  updatePromptGroup,
  deletePromptGroup,
  addPromptToGroup,
  updatePrompt,
  deletePrompt,
  addDslFileToGroup,
  updateDslFile,
  deleteDslFile,
};