const db = require('../config/mysqlConfig')
const moment = require('moment')

let ArticleDao = {
    // 查找所有文章
    selectAll: (start, num) => {
        let sql = `select * from article limit ${start}, ${num}`
        return db.query(sql)
    },
    // 查找
    selectLatest: (start, num) => {
        let sql = `select * from article order by update_time desc limit ${start}, ${num}`
        return db.query(sql)
    },
    selectByID: ID => {
        let sql = `SELECT * FROM article WHERE article_id = ${ID}`
        return db.query(sql)
    },
    selectByTitle: Title => {
        let sql = `SELECT * FROM article WHERE article_title = ${Title}`
        return db.query(sql)
    },
    selectByUserID: UserID => {
        let sql = `SELECT * FROM article WHERE author_id = ${UserID}`
        return db.query(sql)
    },
    update: Article => {
        let updateAt = moment(Date.now()).format('YYYY-MM-DD HH:mm:ss')
        let sql = `UPDATE article SET update_time = '${updateAt}'`
        if(Article.content !== undefined && Article.content !== ''){
            sql += `, content = '${Article.content}'`
        }
        if(Article.description !== undefined && Article.description !== ''){
            sql += `, content = '${Article.description}'`
        }
        if(Article.title !== undefined && Article.title !== ''){
            sql += `, article_title = '${Article.title}'`
        }
        sql += ` where article_id = ${Article.articleID}`
        db.query(sql)
    },
    insert: Article => {
        let createdAt = moment(Date.now()).format('YYYY-MM-DD HH:mm:ss')
        let sql = `insert into article(article_title, author_id, create_time, update_time, description, content) values('${Article.title}', '${Article.authorID}', '${createdAt}', '${createdAt}', '${Article.description}', '${Article.content}')`
        return db.query(sql)
    },
    like: (num, articleID) => {
        let sql = `update article set like_count = like_count + ${num} where article_id = ${articleID}`
        db.query(sql)
    },
    dislike: (num, articleID) => {
        let sql = `update article set dislike_count = dislike_count + ${num} where article_id = ${articleID}`
        db.query(sql)
    },
    comment: articleID => {
        let sql = `update article set comment_count = comment_count + 1  where article_id = ${articleID}`
        db.query(sql)
    }

}

module.exports = ArticleDao