import {
    BASE_URL,
    fetchStores,
    fetchUsers,
    generateRandomBase64String,
    getHeaders,
    login,
    parseIdToString
} from "./common.js";
import {check, group, sleep} from 'k6';
import {randomIntBetween, randomItem} from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';
import http from 'k6/http';

export const options = {
    scenarios: {
        user_reservation: {
            executor: 'ramping-vus',
            startVUs: 0,
            stages: [
                { duration: '3m', target: 500 },
                { duration: '2m', target: 1000 },
                { duration: '2m', target: 1500 },
                { duration: '3m', target: 1500 },
                { duration: '3m', target: 0 },
            ]
        }
    },

    thresholds: {
        http_req_duration: ['p(95)<3000'],
        http_req_failed: ['rate<0.15'],
    },
};


function randomDayBetween(startFrom, endAt) {
    const random = randomIntBetween(startFrom, endAt)
    const targetDate = new Date()
    targetDate.setDate(targetDate.getDate() + random)

    return targetDate.toISOString().split('T')[0];
}

function countForFetchDetails(themeCount) {
    const random = Math.random()

    if (random < 0.5) {
        return Math.min(0, themeCount)
    }
    if (random < 0.75) {
        return Math.min(1, themeCount)
    }
    if (random < 0.9) {
        return Math.min(2, themeCount)
    }
    return Math.min(randomIntBetween(3, themeCount), themeCount)
}

function extractRandomThemeForFetchDetail(themes) {
    const count = countForFetchDetails(themes.length)
    const shuffled = [...themes].sort(() => Math.random() - 0.5)

    return shuffled.slice(0, count).map(t => t.id)
}

export function setup() {
    const users = fetchUsers()
    const stores = fetchStores()

    console.log(`회원 수 = ${users.length} 조회 완료`)
    console.log(`매장 수 = ${stores.length} 조회 완료`)

    return { users, stores }
}

export default function (data) {
    const { users, stores } = data;

    const user = randomItem(users)
    const accessToken = login(user.account, user.password, 'USER').accessToken
    let storeId = randomItem(stores).storeId

    if (!accessToken) {
        console.log(`로그인 실패: token=${accessToken}`)
        return
    }
    let targetDate

    let availableScheduleId, selectedThemeId, selectedThemeInfo, reservationId, totalAmount

    group(`매장=${storeId}, 날짜=${targetDate}의 일정 조회`, function () {
        let searchTrial = 0
        let schedules

        while (searchTrial < 5) {
            storeId = randomItem(stores).storeId
            targetDate = randomDayBetween(1, 7)
            const params = getHeaders(accessToken, "/stores/${storeId}/schedules?date=${date}")
            const res = http.get(`${BASE_URL}/stores/${storeId}/schedules?date=${targetDate}`, params)
            const result = check(res, {'일정 조회 성공': (r) => r.status === 200})
            if (result !== true) {
                continue
            }
            schedules = parseIdToString(res).data.schedules
            if (schedules && schedules.length > 0) {
                break
            }
            searchTrial++
            sleep(10)
        }

        if (schedules.length <= 0) {
            console.log(`5회 시도에도 일정 조회 실패`)
            return;
        }

        group(`일부 테마는 상세 조회`, function () {
            const themesByStoreAndDate = schedules.map(s => s.theme)
            if (!themesByStoreAndDate && themesByStoreAndDate.length <= 0) {
                return
            }
            const randomThemesForFetchDetail = extractRandomThemeForFetchDetail(themesByStoreAndDate)

            randomThemesForFetchDetail.forEach(id => {
                http.get(`${BASE_URL}/themes/${id}`, getHeaders(accessToken, "/themes/${id}"))
                sleep(10)
            })
        })

        const availableSchedules = schedules.filter((s) => s.schedule.status === 'AVAILABLE')
        if (availableSchedules.length > 0) {
            const availableSchedule = randomItem(availableSchedules)
            availableScheduleId = availableSchedule.schedule.id
            selectedThemeId = availableSchedule.theme.id
        }
    })

    if (!availableScheduleId) {
        return;
    }

    let isScheduleHeld = false
    group(`일정 Holding 및 테마 정보 조회 -> 예약 과정중 첫 페이지의 작업 완료`, function () {
        const holdRes = http.post(`${BASE_URL}/schedules/${availableScheduleId}/hold`, null, getHeaders(accessToken, "/schedules/${id}/hold"))
        const body = JSON.parse(holdRes.body)

        if (check(holdRes, {'일정 점유 성공': (r) => r.status === 200})) {
            const themeInfoRes = http.get(`${BASE_URL}/themes/${selectedThemeId}`, { tag: { name: "/themes/${id}"}})
            selectedThemeInfo = parseIdToString(themeInfoRes).data
            isScheduleHeld = true
        } else {
            const errorCode = body.code
            const errorMessage = body.message

            console.log(`일정 점유 실패: code=${errorCode}, message=${errorMessage}`)
        }
    })

    if (!isScheduleHeld || !selectedThemeInfo) {
        return
    }

    let isPendingReservationCreated = false
    group(`예약 정보 입력 페이지`, function () {
        let userName, userContact
        group(`회원 연락처 조회`, function () {
            const userContactRes = http.get(`${BASE_URL}/users/contact`, getHeaders(accessToken, "/users/contact"))

            if (!check(userContactRes, {'회원 연락처 조회 성공': (r) => r.status === 200})) {
                throw new Error("회원 연락처 조회 과정에서 예외 발생")
            }

            const responseBody = JSON.parse(userContactRes.body).data
            userName = responseBody.name
            userContact = responseBody.phone
        })

        // 20%의 유저는 예약 정보 입력창에서 나감 => 배치의 자동 활성화 테스트
        if (Math.random() <= 0.2) {
            return
        }

        sleep(20)

        group(`예약 정보 입력 및 Pending 예약 생성`, function () {
            const requirement = `${selectedThemeInfo.name}을 잘부탁드려요!`
            const participants = randomIntBetween(selectedThemeInfo.minParticipants, selectedThemeInfo.maxParticipants)
            totalAmount = Math.round(participants * selectedThemeInfo.price)

            const payload = JSON.stringify({
                scheduleId: availableScheduleId,
                reserverName: userName,
                reserverContact: userContact,
                participantCount: participants,
                requirement: requirement
            })

            const pendingReservationCreateRes = http.post(`${BASE_URL}/reservations/pending`, payload, getHeaders(accessToken, "/reservations/pending"))
            const responseBody = parseIdToString(pendingReservationCreateRes)

            if (pendingReservationCreateRes.status !== 200) {
                const errorCode = responseBody.code
                const errorMessage = responseBody.message

                throw new Error(`Pending 예약 중 실패: code=${errorCode}, message=${errorMessage}`)
            }

            reservationId = responseBody.data.id
            isPendingReservationCreated = true
        })
    })

    if (!isPendingReservationCreated) {
        return;
    }

    group(`결제 및 예약 확정`, function () {
        // 20%의 유저는 결제 화면에서 나감 => 배치의 자동 만료 처리 테스트
        if (Math.random() <= 0.2) {
            return
        }

        const paymentKey = generateRandomBase64String(64)
        const orderId = generateRandomBase64String(25)

        const payload = JSON.stringify({
            paymentKey: paymentKey,
            orderId: orderId,
            amount: totalAmount,
        })

        let trial = 0
        let isConfirmed = false
        while (trial < 2) {
            sleep(30)
            const confirmOrderRes = http.post(`${BASE_URL}/orders/${reservationId}/confirm`, payload, getHeaders(accessToken, "/orders/${reservationId}/confirm"))

            if (check(confirmOrderRes, {'예약 확정 성공': (r) => r.status === 200})) {
                isConfirmed = true
                break
            }

            const errorResponse = JSON.parse(confirmOrderRes.body)
            console.log(`예약 확정 실패: message=${errorResponse.message}`)
            trial = errorResponse.trial + 1
        }

        // 예약이 확정되었으면 종료, 아니면 임시 확정
        if (isConfirmed) {
            return
        }

        sleep(10)
        const temporalConfirmRes = http.post(`${BASE_URL}/reservations/${reservationId}/confirm`)
        if (check(temporalConfirmRes, {'임시 예약 확정 성공': (r) => r.status === 200})) {
            console.log("예약 확정 성공")
            return
        }
        throw new Error('임시 예약 확정 실패')
    })
}