/**
 * Artillery 压力测试处理器
 * 用于生成测试数据和自定义逻辑
 * 
 * 注意：使用 CommonJS 格式以兼容 Artillery
 */

// 节目ID列表
const programIds = [
    'p1',
    'p2',
    'p3',
    'p4',
    'p5',
    'p6',
    'p7',
];

// 奖项票种列表 (与 shared/constants 一致)
const ticketTypes = [
    'creative',
    'visual',
    'atmosphere',
    'performance',
    'teamwork',
    'popularity',
    'potential',
];

// 用户计数器 (确保每个虚拟用户有唯一ID)
let userCounter = 0;

/**
 * 生成唯一用户ID
 */
function generateUserId(userContext, events, done) {
    userCounter++;
    const timestamp = Date.now();
    userContext.vars.userId = `stress_user_${timestamp}_${userCounter}`;
    userContext.vars.voteIndex = 0; // 初始化投票索引
    userContext.vars.usedTickets = []; // 已使用的票种
    return done();
}

/**
 * 随机选择一个节目
 */
function selectRandomProgram(userContext, events, done) {
    const randomIndex = Math.floor(Math.random() * programIds.length);
    userContext.vars.selectedProgram = programIds[randomIndex];
    return done();
}

/**
 * 随机选择一个未使用的票种
 * 符合业务逻辑：每种票只能用一次
 */
function selectRandomTicketType(userContext, events, done) {
    const usedTickets = userContext.vars.usedTickets || [];
    const availableTickets = ticketTypes.filter(t => !usedTickets.includes(t));

    if (availableTickets.length === 0) {
        // 所有票已用完，重置 (用于压测场景)
        userContext.vars.usedTickets = [];
        userContext.vars.selectedTicket = ticketTypes[0];
    } else {
        const randomIndex = Math.floor(Math.random() * availableTickets.length);
        userContext.vars.selectedTicket = availableTickets[randomIndex];
        userContext.vars.usedTickets.push(availableTickets[randomIndex]);
    }

    return done();
}

/**
 * 顺序选择票种 (确保不重复)
 */
function selectNextTicketType(userContext, events, done) {
    const voteIndex = userContext.vars.voteIndex || 0;
    userContext.vars.selectedTicket = ticketTypes[voteIndex % ticketTypes.length];
    userContext.vars.voteIndex = voteIndex + 1;
    return done();
}

/**
 * 记录投票结果 (用于调试)
 */
function logVoteResult(userContext, events, done) {
    const { userId, selectedProgram, selectedTicket } = userContext.vars;
    console.log(`[VOTE] User: ${userId} -> Program: ${selectedProgram} (${selectedTicket})`);
    return done();
}

/**
 * 生成随机延迟 (模拟真实用户行为)
 */
function randomDelay(userContext, events, done) {
    const minDelay = 100;  // 最小 100ms
    const maxDelay = 500;  // 最大 500ms
    const delay = Math.floor(Math.random() * (maxDelay - minDelay)) + minDelay;
    userContext.vars.thinkTime = delay / 1000; // 转换为秒
    return done();
}

/**
 * 随机入场延迟 0.1-3秒 (模拟分散入场)
 */
function randomEntryDelay(userContext, events, done) {
    const delay = (Math.floor(Math.random() * 30) + 1) / 10; // 0.1 - 3.0 秒
    userContext.vars.entryDelay = delay;
    return done();
}

/**
 * 随机短延迟 0.2-0.8秒 (投票间隔)
 */
function randomVoteDelay(userContext, events, done) {
    const delay = (Math.floor(Math.random() * 6) + 2) / 10; // 0.2 - 0.8 秒
    userContext.vars.voteDelay = delay;
    return done();
}

/**
 * 随机入场延迟 0-5秒 (观望用户)
 */
function randomLateEntryDelay(userContext, events, done) {
    const delay = Math.floor(Math.random() * 50) / 10; // 0 - 5.0 秒
    userContext.vars.entryDelay = delay;
    return done();
}

/**
 * 顺序选择票种 - 确保每人投完7种不同的票（按顺序）
 * 对应7个奖项：creative, visual, atmosphere, performance, teamwork, popularity, potential
 */
function selectSequentialTicket(userContext, events, done) {
    const voteIndex = userContext.vars.voteIndex || 0;
    // 按顺序取票种，确保7票投给不同奖项
    userContext.vars.selectedTicket = ticketTypes[voteIndex % ticketTypes.length];
    userContext.vars.voteIndex = voteIndex + 1;
    return done();
}

/**
 * 正常投票延迟 1-2秒（正常投票者）
 */
function randomNormalDelay(userContext, events, done) {
    const delay = (Math.floor(Math.random() * 10) + 10) / 10; // 1.0 - 2.0 秒
    userContext.vars.normalDelay = delay;
    return done();
}

/**
 * 长延迟 5-10秒（观望型用户，先不投）
 */
function randomLongDelay(userContext, events, done) {
    const delay = (Math.floor(Math.random() * 50) + 50) / 10; // 5.0 - 10.0 秒
    userContext.vars.longDelay = delay;
    return done();
}

/**
 * 慢速投票延迟 3-5秒（犹豫不决型）
 */
function randomSlowDelay(userContext, events, done) {
    const delay = (Math.floor(Math.random() * 20) + 30) / 10; // 3.0 - 5.0 秒
    userContext.vars.slowDelay = delay;
    return done();
}

/**
 * 在连接前打印信息 (调试用)
 */
function beforeConnect(requestParams, context, ee, next) {
    console.log(`[CONNECT] Connecting user: ${context.vars.userId}`);
    return next();
}

/**
 * 处理响应 (调试用)
 */
function afterResponse(requestParams, response, context, ee, next) {
    if (response.body && response.body.error) {
        console.log(`[ERROR] ${context.vars.userId}: ${response.body.error}`);
    }
    return next();
}

// CommonJS exports
exports.generateUserId = generateUserId;
exports.selectRandomProgram = selectRandomProgram;
exports.selectRandomTicketType = selectRandomTicketType;
exports.selectNextTicketType = selectNextTicketType;
exports.selectSequentialTicket = selectSequentialTicket;
exports.logVoteResult = logVoteResult;
exports.randomDelay = randomDelay;
exports.randomEntryDelay = randomEntryDelay;
exports.randomVoteDelay = randomVoteDelay;
exports.randomLateEntryDelay = randomLateEntryDelay;
exports.randomNormalDelay = randomNormalDelay;
exports.randomLongDelay = randomLongDelay;
exports.randomSlowDelay = randomSlowDelay;
exports.beforeConnect = beforeConnect;
exports.afterResponse = afterResponse;