import http from 'k6/http';

export const BASE_URL = __ENV.BASE_URL || 'http://localhost:8080';

export function generateRandomBase64String(length) {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    let result = '';
    for (let i = 0; i < length; i++) {
        result += chars.charAt(Math.floor(Math.random() * chars.length));
    }
    return result;
}

export function parseIdToString(response) {
    try {
        const safeJsonString = response.body.replace(/"(\w*Id|id)"\s*:\s*(\d{16,})/g, '"$1":"$2"');
        return JSON.parse(safeJsonString);
    } catch (e) {
        console.error(`JSON parsing failed for VU ${__VU}: ${e}`);
        return null;
    }
}

export function maxIterations() {
    const maxIterationsRes = http.get(`${BASE_URL}/tests/max-iterations`)
    if (maxIterationsRes.status !== 200) {
        throw new Error('max-iterations 조회 실패')
    }

    return maxIterationsRes.json('count')
}

export function fetchUsers() {
    const userCount = Math.round(maxIterations() * 1.2)
    const userAccountRes = http.get(`${BASE_URL}/tests/users?count=${userCount}`)

    if (userAccountRes.status !== 200) {
        throw new Error('users 조회 실패')
    }

    return userAccountRes.json('results')
}

export function fetchStores() {
    const storeIdListRes = http.get(`${BASE_URL}/tests/stores`)

    if (storeIdListRes.status !== 200) {
        throw new Error('stores 조회 실패')
    }

    return parseIdToString(storeIdListRes).results
}

export function login(account, password, principalType) {
    const loginPayload = JSON.stringify({
        account: account,
        password: password,
        principalType: principalType
    })
    const params = { headers: { 'Content-Type': 'application/json' } }

    const loginRes = http.post(`${BASE_URL}/auth/login`, loginPayload, params)

    if (loginRes.status !== 200) {
        throw new Error(`로그인 실패: ${__VU}`)
    }

    const body = parseIdToString(loginRes).data
    if (principalType === 'ADMIN') {
        return {
            storeId: body.storeId,
            accessToken: body.accessToken
        }
    } else {
        return {
            accessToken: body.accessToken
        }
    }
}

export function getHeaders(token) {
    const headers = {
        'Content-Type': 'application/json',
    };

    if (token) {
        headers['Authorization'] = `Bearer ${token}`;
    }

    return { headers: headers };
}