const API = require("../../../lib/API.js");
const db = require("../../../plugin/DataBase/db.js");
const Redis = require("../../../plugin/DataBase/Redis.js");
const { BaseStdResponse } = require("../../../BaseStdResponse.js");
const AccessControl = require("../../../lib/AccessControl.js");
const { insertBindAudit, BindAuditAction, BindAuditSource } = require("../../../lib/Lepao/BindAudit.js");

class AddAccount extends API {
    constructor() {
        super();

        this.setPath('/Lepao/Account')
        this.setMethod('POST')

        this.emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/
        this.banEmailList = ['icloud.com']
        this.autoUnbindDailyLimit = 10
    }

    // 生成 6 位数字 + 字母混合码
    async generateCode() {
        try {
            const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
            let code = ""
            for (let i = 0; i < 6; i++) {
                code += chars.charAt(Math.floor(Math.random() * chars.length))
            }

            let sql = 'SELECT id FROM lepao_extra WHERE bind_code = ?'
            let rows = await db.query(sql, [code])
            if (!rows)
                throw new Error('数据库错误，请稍后再试')
            if (rows.length > 0)
                return await this.generateCode()
            return code
        } catch (error) {
            throw error
        }
    }

    getSemesterStartTimestamp() {
        const now = new Date()
        const year = now.getFullYear()
        const feb1ThisYear = new Date(year, 1, 1, 0, 0, 0, 0)
        const aug31ThisYear = new Date(year, 7, 31, 0, 0, 0, 0)
        if (now >= feb1ThisYear && now < aug31ThisYear) {
            return feb1ThisYear.getTime()
        }
        return new Date(now < feb1ThisYear ? year - 1 : year, 7, 31, 0, 0, 0, 0).getTime()
    }

    getAutoUnbindDailyRedisKey() {
        const now = new Date()
        const year = now.getFullYear()
        const month = `${now.getMonth() + 1}`.padStart(2, '0')
        const day = `${now.getDate()}`.padStart(2, '0')
        return `lepao:auto_unbind:daily:${year}${month}${day}`
    }

    getSecondsToDayEnd() {
        const now = new Date()
        const tomorrow = new Date(now.getFullYear(), now.getMonth(), now.getDate() + 1, 0, 0, 0, 0)
        return Math.max(1, Math.floor((tomorrow.getTime() - now.getTime()) / 1000))
    }

    async onRequest(req, res) {
        let { uuid, session, student_num, email, id, area, auto_time, auto_run, target_count, auto_day, notice_type, notes } = req.body

        if ([uuid, session, student_num, auto_time, target_count, auto_day].some(value => value === '' || value === null || value === undefined))
            return res.json({
                ...BaseStdResponse.MISSING_PARAMETER
            })

        if (isNaN(target_count) || target_count < 0 || target_count > 99) {
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '乐跑目标次数不在合法范围内'
            })
        }

        if (notice_type === 'email') {
            if (!this.emailRegex.test(email)) {
                return res.json({
                    ...BaseStdResponse.ERR,
                    msg: '请检查邮箱格式是否正确'
                })
            }

            const emailDomain = email.split('@')[1].toLowerCase()
            if (this.banEmailList.includes(emailDomain))
                return res.json({
                    ...BaseStdResponse.ERR,
                    msg: `暂不支持使用 ${emailDomain} 域名的邮箱，请更换其他邮箱后重试`
                })
        }

        if (auto_run === 1 && (!Array.isArray(auto_day) || !auto_day.every(v => Number.isInteger(v) && v >= 0 && v <= 6)))
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '自动乐跑日期格式不合法'
            })

        if (!await AccessControl.checkSession(uuid, session))
            return res.status(401).json({
                ...BaseStdResponse.ACCESS_DENIED
            })

        let countSql = 'SELECT id, create_user, total_num, auto_run, update_time FROM lepao_account WHERE student_num = ?'
        let countRows = await db.query(countSql, [student_num])

        if (!countRows)
            return res.json({ ...BaseStdResponse.ERR, msg: '添加乐跑账号失败！数据库错误' })

        // 判断是否重复注册
        if (!id) {
            if (countRows.length !== 0 && countRows[0].create_user != null) {
                if (countRows[0].create_user !== uuid) {
                    const semesterStartTimestamp = this.getSemesterStartTimestamp()
                    const dailyAutoUnbindKey = this.getAutoUnbindDailyRedisKey()
                    const dailyAutoUnbindCount = Number(await Redis.get(dailyAutoUnbindKey) || 0)
                    const canAutoUnbindAndRebind = (countRows[0].auto_run === 0) &&
                        (!countRows[0].update_time || countRows[0].update_time < semesterStartTimestamp) &&
                        (dailyAutoUnbindCount < this.autoUnbindDailyLimit)
                    if (!canAutoUnbindAndRebind)
                        return res.json({ ...BaseStdResponse.ERR, msg: '该乐跑账号已被其他用户绑定，请联系客服处理' })
                } else {
                    return res.json({ ...BaseStdResponse.ERR, msg: '该乐跑账号您已绑定' })
                }
            }
        }

        if (countRows.length !== 0) {
            if (auto_run === 1 && countRows[0].total_num >= target_count && target_count !== 0)
                return res.json({ ...BaseStdResponse.ERR, msg: '该账号累计跑步次数已达到预设目标次数，请尝试增大目标次数后再试' })
        }

        const time = new Date().getTime()
        const previousOwner = countRows.length !== 0 ? countRows[0].create_user : null
        const shouldAutoUnbindAndRebind = !id &&
            countRows.length !== 0 &&
            previousOwner != null &&
            previousOwner !== uuid
        const shouldRecordBind = !id && previousOwner !== uuid

        let sql, r

        if (!id) {
            if (countRows.length !== 0) {
                sql = 'UPDATE lepao_account SET create_user = ?, email = ?, area = ?, auto_time = ?, auto_run = ?, target_count = ?, create_time = ?, update_time = ?, notes = ?, auto_day = ?, notice_type = ? WHERE id = ?'
                r = await db.query(sql, [uuid, email ?? '', area, auto_time, auto_run, target_count, time, time, notes ?? '', JSON.stringify(auto_day), notice_type, countRows[0].id])
            }
            else {
                const bind_code = await this.generateCode()

                sql = 'INSERT INTO lepao_account (student_num, email, area, auto_time, auto_run, target_count, create_user, create_time, notes, auto_day, notice_type) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'
                r = await db.query(sql, [student_num, email ?? '', area, auto_time, auto_run, target_count, uuid, time, notes ?? '', JSON.stringify(auto_day), notice_type])

                let faceSql = 'INSERT INTO lepao_extra (student_num, bind_code) VALUES (?, ?)'
                let faceRows = await db.query(faceSql, [student_num, bind_code])
                if (!faceRows || faceRows.affectedRows !== 1)
                    return res.json({ ...BaseStdResponse.ERR, msg: '添加乐跑账号失败！数据库错误' })
            }
        } else {
            sql = 'UPDATE lepao_account SET student_num = ?, email = ?, area = ?, auto_time = ?, target_count = ?, auto_run = ?, notes = ?, auto_day = ?, update_time = ?, notice_type = ? WHERE id = ?'
            r = await db.query(sql, [student_num, email ?? '', area, auto_time, target_count, auto_run, notes ?? '', JSON.stringify(auto_day), time, notice_type, id])
        }

        try {
            if (r && r.affectedRows > 0) {
                const selectSql = `
                                    SELECT 
                                        a.id, a.create_user, a.total_num, e.bind_code, e.bot_account
                                    FROM
                                        lepao_account a
                                    LEFT JOIN  
                                        lepao_extra e
                                    ON
                                        a.student_num = e.student_num
                                    WHERE 
                                        a.student_num = ?
                                `
                const selectRows = await db.query(selectSql, [student_num])
                if (!selectRows)
                    return res.json({ ...BaseStdResponse.ERR, msg: '添加乐跑账号失败！数据库错误' })

                res.json({
                    ...BaseStdResponse.OK,
                    id: r.insertId,
                    data: {
                        student_num, email, id, area, auto_time, auto_run, target_count, auto_day, notice_type, notes,
                        bind_code: selectRows.length !== 0 ? selectRows[0].bind_code : undefined,
                        bot_account: selectRows.length !== 0 ? selectRows[0].bot_account : undefined
                    }
                })

                if (shouldRecordBind) {
                    if (shouldAutoUnbindAndRebind) {
                        const unbindAuditOk = await insertBindAudit({
                            studentNum: student_num,
                            ownerUuid: previousOwner,
                            action: BindAuditAction.PLATFORM_UNBIND,
                            source: BindAuditSource.USER_API,
                            operatorUuid: uuid,
                            detail: { via: 'AddAccount:auto_unbind_rebind' },
                            createdAt: time
                        })
                        if (!unbindAuditOk) {
                            this.logger.warn(`自动解绑审计写入失败 student_num=${student_num}`)
                        } else {
                            const dailyAutoUnbindKey = this.getAutoUnbindDailyRedisKey()
                            const latestAutoUnbindCount = await Redis.incr(dailyAutoUnbindKey)
                            if (latestAutoUnbindCount === 1) {
                                await Redis.expire(dailyAutoUnbindKey, this.getSecondsToDayEnd())
                            }
                        }
                    }
                    const auditOk = await insertBindAudit({
                        studentNum: student_num,
                        ownerUuid: uuid,
                        action: BindAuditAction.PLATFORM_BIND,
                        source: BindAuditSource.USER_API,
                        operatorUuid: uuid,
                        detail: { via: 'AddAccount' },
                        createdAt: time
                    })
                    if (!auditOk) {
                        this.logger.warn(`绑定审计写入失败 student_num=${student_num}`)
                    }
                }
            } else {
                return res.json({ ...BaseStdResponse.ERR, msg: '添加乐跑账号失败！数据库错误' })
            }
        } catch (err) {
            this.logger.error(`添加乐跑账号失败！${err.stack}`)
            res.json({
                ...BaseStdResponse.ERR,
                msg: "添加乐跑账号失败！",
            });
        }
    }
}

module.exports.AddAccount = AddAccount;