const express = require('express');
const router = express.Router();
const {Article} = require('../../models')
const {Op} = require('sequelize')

/* 
    查询文章列表
    GET /admin/articles
 */
router.get('/', async function(req, res, next) {
    try {
        const query = req.query
        
        //当前是第几页，如果不传，那就是第一页
        const currentPage = Math.abs(Number(query.currentPage)) || 1

        //每页显示多少条数据，如果不传，那就显示10条
        const pageSize = Math.abs(Number(query.pageSize)) || 10

        //计算 offset
        const offset = (currentPage - 1) * pageSize

        const condition = {
            order:[['id','DESC']],
            limit:pageSize,
            offset
        }

        if(query.title){
            condition.where = {
                title:{
                    [Op.like]:`%${query.title}%`
                }
            }
        }

        const {count ,rows} = await Article.findAndCountAll(condition)

        res.json({
            status:true,
            message:'成功',
            data:{
                articles:rows,
                pagination:{
                    total:count,
                    currentPage,
                    pageSize
                }
            }
        });
    }catch(error){
        res.status(500).json({
            status:false,
            message:'失败',
            errors:[error.message]
        });
    }
});

/* 
    查询文章详情
    GET /admin/articles/:id
 */
router.get('/:id', async function(req, res, next) {
    try {
        //获取文章id
        const {id} = req.params

        //查询文章
        const article = await Article.findByPk(id)

        if(article){
            res.json({
                status:true,
                message:'成功',
                data:article
            });
        }else{
            res.status(404).json({
                status:false,
                message:'文章未找到',
            });
        }
    }catch(error){
        res.status(500).json({
            status:false,
            message:'失败',
            errors:[error.message]
        });
    }
});

/* 
    创建文章
    POST /admin/articles/
 */
router.post('/', async function(req, res, next) {
    try {
        //白名单过滤
        const body = filterBody(req)

        // 添加调试日志
        console.log('创建文章请求体大小:', JSON.stringify(body).length);
        console.log('Content字段长度:', body.content ? body.content.length : 0);

        const article = await Article.create(body)
        res.status(201).json({
            status:true,
            message:'成功',
            data:article
        }); 
    }catch(error){
        // 添加详细的错误日志
        console.error('创建文章错误:', error);
        console.error('错误堆栈:', error.stack);
        console.error('请求体:', JSON.stringify(req.body, null, 2));

        if(error.name === 'SequelizeValidationError'){
            const errors = error.errors.map(e =>e.message)

            res.status(400).json({ 
                status:false,
                message:'请求参数错误',
                errors
            });
        }else if(error.name === 'SequelizeDatabaseError'){
            res.status(500).json({ 
                status:false,
                message:'数据库错误',
                errors:[error.message]
            });
        }else if(error.name === 'SequelizeConnectionError'){
            res.status(500).json({ 
                status:false,
                message:'数据库连接错误',
                errors:[error.message]
            });
        }else{
            res.status(500).json({ 
                status:false,
                message:'服务器内部错误',
                errors:[error.message]
            });
        }
        
    }
});

/* 
    删除文章
    GET /admin/articles/:id
 */
router.delete('/:id', async function(req, res, next) {
    try {
        //获取文章id
        const {id} = req.params

        //查询文章
        const article = await Article.findByPk(id)

        if(article){
            await article.destroy()

            res.json({
                status:true,
                message:'成功',
            });
        }else{
            res.status(404).json({
                status:false,
                message:'文章未找到',
            });
        }
    }catch(error){
        res.status(500).json({
            status:false,
            message:'失败',
            errors:[error.message]
        });
    }
});

/* 
    更新文章
    GET /admin/articles/:id
 */
router.put('/:id', async function(req, res, next) {
    try {
        //获取文章id
        const {id} = req.params

        //查询文章
        const article = await Article.findByPk(id)

        //白名单过滤
        const body = filterBody(req)

        if(article){
            await article.update(body)
            
            res.json({
                status:true,
                message:'成功',
                data:article
            });
        }else{
            res.status(404).json({
                status:false,
                message:'文章未找到',
            });
        }
    }catch(error){
        res.status(500).json({
            status:false,
            message:'失败',
            errors:[error.message]
        });
    }
});

function filterBody(req){
    // 数据清理和验证
    const body = {
        title: req.body.title ? String(req.body.title).trim() : null,
        content: req.body.content ? String(req.body.content) : null,
        type: req.body.type ? parseInt(req.body.type) : null,
        img: req.body.img ? String(req.body.img).trim() : null,
        date: req.body.date ? new Date(req.body.date) : null,
        author: req.body.author ? String(req.body.author).trim() : null,
        category: req.body.category ? parseInt(req.body.category) : null,
        crop: req.body.crop ? parseInt(req.body.crop) : null,
        seoKeyword: req.body.seoKeyword ? String(req.body.seoKeyword).trim() : null,
        seoDescription: req.body.seoDescription ? String(req.body.seoDescription).trim() : null
    };

    // 验证必填字段
    if (!body.title) {
        throw new Error('标题不能为空');
    }

    if (!body.content) {
        throw new Error('内容不能为空');
    }

    // 验证标题长度
    if (body.title.length > 255) {
        throw new Error('标题长度不能超过255个字符');
    }

    return body;
}

module.exports = router;