const { URLSearchParams } = require('url')
const { dataEncrypt, dataDecrypt, dataSign } = require('../../plugin/Lepao/Crypto')
const { postLepaoSchool } = require('./lepaoSchoolHttp')

const BASE_URL = 'https://lepao.ctbu.edu.cn/v3/api.php'
const DEFAULT_USER_AGENT = 'Mozilla/5.0 (Linux; Android 16; 2211133C Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.180 Mobile Safari/537.36 XWEB/1380347 MMWEBSDK/20250202 MMWEBID/1020 wxwork/5.0.6.66174 MicroMessenger/8.0.28.48(0x28001c30) MiniProgramEnv/android Luggage/3.0.2.95ef3f83 NetType/WIFI Language/zh_CN ABI/arm64'

function lepaoTimestamp() {
    return Number((Date.now() / 1000).toFixed(3))
}

function lepaoNonce() {
    return String(Math.floor(Math.random() * 900000 + 100000))
}

function buildSignedRaw(account, extraFields = {}) {
    const studentNum = account.student_num || account.student_id
    const raw = {
        school_id: account.school_id,
        term_id: 0,
        course_id: 0,
        class_id: 0,
        student_num: studentNum,
        card_id: studentNum,
        uid: account.uid,
        token: account.token,
        timestamp: lepaoTimestamp(),
        version: 1,
        nonce: lepaoNonce(),
        ostype: 5,
        ...extraFields
    }
    raw.sign = dataSign(raw)
    return raw
}

function unwrapLepaoResponse(result) {
    if (result?.data && Number(result.is_encrypt) === 1) {
        const decrypted = dataDecrypt(result.data)
        if (!decrypted) {
            const err = new Error('官方乐跑接口解密失败')
            err.code = 'LEPAO_DECRYPT_FAILED'
            throw err
        }
        result.data = JSON.parse(decrypted)
    }

    const failedByStatus = Object.prototype.hasOwnProperty.call(result || {}, 'status') && Number(result.status) !== 1
    const failedByCode = Object.prototype.hasOwnProperty.call(result || {}, 'code') && Number(result.code) !== 1 && Number(result.code) !== 200
    if (failedByStatus || failedByCode) {
        const msg = result?.info || result?.msg || '官方乐跑接口请求失败'
        const err = new Error(msg)
        err.code = Number(result?.status) === 101 ? 'LEPAO_LOGIN_EXPIRED' : 'LEPAO_OFFICIAL_FAILED'
        err.result = result
        throw err
    }

    return result
}

async function postLepaoApi(pathSuffix, account, extraFields = {}, options = {}) {
    const raw = buildSignedRaw(account, extraFields)
    const form = new URLSearchParams()
    form.append('ostype', '5')
    form.append('data', dataEncrypt(JSON.stringify(raw)))

    const res = await postLepaoSchool(`${BASE_URL}${pathSuffix}`, form, {
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'Accept': '*/*',
            'Accept-Language': 'zh-CN,zh-Hans;q=0.9',
            'Accept-Encoding': 'gzip, deflate, br',
            'Referer': 'https://servicewechat.com/wxf94c4ddb63d87ede/32/page-frame.html',
            'User-Agent': account.userAgent || DEFAULT_USER_AGENT
        },
        timeout: options.timeout || 20000,
        logger: options.logger
    })

    return unwrapLepaoResponse(res.data)
}

async function getCurrentTerm(account, options = {}) {
    const result = await postLepaoApi('/WpRun/getTermList', account, {}, options)
    const list = Array.isArray(result.data) ? result.data : []
    const current = list.find(item => String(item.status) === '1')
    if (!current?.term_id) {
        const err = new Error('未找到当前学期')
        err.code = 'LEPAO_TERM_NOT_FOUND'
        throw err
    }
    return current
}

async function getTermRunRecord(account, { termId, page = 1 } = {}, options = {}) {
    const currentPage = Number(page)
    return postLepaoApi(
        '/WpRun/getTermRunRecord',
        account,
        {
            term_id: String(termId),
            page: Number.isFinite(currentPage) && currentPage > 0 ? currentPage : 1
        },
        options
    )
}

module.exports = {
    getCurrentTerm,
    getTermRunRecord
}