<?php

/**
 * 投票API接口
 * 支持POST和GET请求方式
 * 提供投票列表、投票详情、提交投票、获取结果等功能
 */

// 引入必要文件
require_once 'inc/pubs.php';
require_once 'inc/sqls.php';

// 设置响应头
header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type, Authorization');

// 处理OPTIONS预检请求
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit;
}

// 获取请求参数（支持GET和POST）
function getRequestParams() {
    if ($_SERVER['REQUEST_METHOD'] === 'GET') {
        return $_GET;
    } elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
        if (isset($_SERVER['CONTENT_TYPE']) && strpos($_SERVER['CONTENT_TYPE'], 'application/json') !== false) {
            $json = file_get_contents('php://input');
            return json_decode($json, true) ?: [];
        }
        return $_POST;
    }
    return [];
}

// 获取请求参数
$params = getRequestParams();

// 获取操作类型
$action = isset($params['act']) ? $params['act'] : '';

// 实例化数据库操作类
$db = new DB();

// 根据操作类型执行相应操作
switch ($action) {
    // 获取投票列表
    case 'getVoteList':
        handleGetVoteList($params, $db);
        break;
    
    // 获取投票详情
    case 'getVoteDetail':
        handleGetVoteDetail($params, $db);
        break;
    
    // 提交投票
    case 'submitVote':
        handleSubmitVote($params, $db);
        break;
    
    // 获取投票结果
    case 'getVoteResult':
        handleGetVoteResult($params, $db);
        break;
    
    // 获取用户的投票记录
    case 'getUserVotes':
        handleGetUserVotes($params, $db);
        break;
    
    // 未知操作
    default:
        apiResponse(1, '未知操作');
        break;
}

/**
 * 处理获取投票列表
 * @param array $params 请求参数
 * @param DB $db 数据库操作对象
 */
function handleGetVoteList($params, $db) {
    // 获取分页参数
    $page = isset($params['page']) ? intval($params['page']) : 1;
    $pageSize = isset($params['pageSize']) ? intval($params['pageSize']) : 10;
    
    // 获取筛选参数
    $status = isset($params['status']) ? intval($params['status']) : -1;
    $type = isset($params['type']) ? intval($params['type']) : -1;
    
    // 构建查询条件
    $whereConditions = [];
    if ($status >= 0) {
        $whereConditions[] = "status = $status";
    }
    if ($type >= 0) {
        $whereConditions[] = "itype = $type";
    }
    
    $whereStr = !empty($whereConditions) ? implode(' AND ', $whereConditions) : '';
    
    // 获取总记录数
    $total = $db->count('vote', $whereStr);
    
    // 计算分页信息
    $pagination = getPagination($total, $page, $pageSize);
    
    // 获取投票列表
    $orderBy = "addtime DESC";
    $limit = "{$pagination['offset']}, {$pagination['pageSize']}";
    $voteList = $db->getAll('vote', $whereStr, '*', $orderBy, $limit);
    
    // 当前时间，用于判断投票状态
    $now = date('Y-m-d H:i:s');
    
    // 处理投票状态
    foreach ($voteList as &$vote) {
        $vote['status_text'] = '';
        $vote['status_class'] = '';
        
        if ($vote['status'] == 0) {
            $vote['status_text'] = '已禁用';
            $vote['status_class'] = 'vote-status-disabled';
        } else {
            if ($vote['statime'] > $now) {
                $vote['status_text'] = '未开始';
                $vote['status_class'] = 'vote-status-pending';
            } elseif ($vote['endtime'] < $now) {
                $vote['status_text'] = '已结束';
                $vote['status_class'] = 'vote-status-ended';
            } else {
                $vote['status_text'] = '进行中';
                $vote['status_class'] = 'vote-status-active';
            }
        }
    }
    
    apiResponse(0, '获取成功', [
        'list' => $voteList,
        'pagination' => $pagination
    ]);
}

/**
 * 处理获取投票详情
 * @param array $params 请求参数
 * @param DB $db 数据库操作对象
 */
function handleGetVoteDetail($params, $db) {
    // 获取投票ID
    $voteId = isset($params['id']) ? intval($params['id']) : 0;
    
    if (!$voteId) {
        apiResponse(1, '参数错误');
    }
    
    // 获取投票信息
    $vote = $db->getOne('vote', "id = $voteId");
    if (!$vote) {
        apiResponse(1, '投票不存在');
    }
    
    // 更新浏览次数
    $db->update('vote', ['iview' => $vote['iview'] + 1], "id = $voteId");
    
    // 获取投票选项
    $options = $db->getAll('xuan', "topic_id = $voteId", '*', 'sort ASC, id ASC');
    
    // 当前时间，用于判断投票状态
    $now = date('Y-m-d H:i:s');
    
    // 处理投票状态
    $vote['status_text'] = '';
    $vote['status_class'] = '';
    
    if ($vote['status'] == 0) {
        $vote['status_text'] = '已禁用';
        $vote['status_class'] = 'vote-status-disabled';
    } else {
        if ($vote['statime'] > $now) {
            $vote['status_text'] = '未开始';
            $vote['status_class'] = 'vote-status-pending';
        } elseif ($vote['endtime'] < $now) {
            $vote['status_text'] = '已结束';
            $vote['status_class'] = 'vote-status-ended';
        } else {
            $vote['status_text'] = '进行中';
            $vote['status_class'] = 'vote-status-active';
        }
    }
    
    // 检查用户是否已投票
    $hasVoted = false;
    $userVotes = [];
    $user = checkLogin();
    
    if ($user) {
        $userVoteRecords = $db->getAll('recs', "topic_id = $voteId AND user_id = {$user['id']}");
        
        if (!empty($userVoteRecords)) {
            $hasVoted = true;
            foreach ($userVoteRecords as $record) {
                $userVotes[] = $record['option_id'];
            }
        }
    }
    
    // 计算是否可以投票
    $canVote = $vote['status'] == 1 && $vote['statime'] <= $now && $vote['endtime'] >= $now && !$hasVoted && $user;
    
    apiResponse(0, '获取成功', [
        'vote' => $vote,
        'options' => $options,
        'hasVoted' => $hasVoted,
        'userVotes' => $userVotes,
        'canVote' => $canVote
    ]);
}

/**
 * 处理提交投票
 * @param array $params 请求参数
 * @param DB $db 数据库操作对象
 */
function handleSubmitVote($params, $db) {
    // 验证权限
    $user = checkLogin();
    if (!$user) {
        apiResponse(1, '请先登录');
    }
    
    // 获取参数
    $topicId = isset($params['topic_id']) ? intval($params['topic_id']) : 0;
    $options = isset($params['options']) ? $params['options'] : [];
    
    // 参数验证
    if (empty($topicId) || empty($options)) {
        apiResponse(1, '参数错误');
    }
    
    // 确保options是数组
    if (!is_array($options)) {
        $options = explode(',', $options);
    }
    
    if (empty($options)) {
        apiResponse(1, '请至少选择一个选项');
    }
    
    // 获取投票信息
    $vote = $db->getOne('vote', "id = $topicId");
    if (!$vote) {
        apiResponse(1, '投票不存在');
    }
    
    // 验证投票状态
    $now = date('Y-m-d H:i:s');
    if ($vote['status'] != 1) {
        apiResponse(1, '该投票已被禁用');
    }
    
    if ($vote['statime'] > $now) {
        apiResponse(1, '该投票尚未开始');
    }
    
    if ($vote['endtime'] < $now) {
        apiResponse(1, '该投票已经结束');
    }
    
    // 检查用户是否已投票
    $hasVoted = $db->count('recs', "topic_id = $topicId AND user_id = {$user['id']}");
    if ($hasVoted > 0) {
        apiResponse(1, '您已经参与过该投票');
    }
    
    // 验证选项数量
    if ($vote['itype'] == 1 && count($options) > $vote['maxtime']) {
        apiResponse(1, "最多只能选择 {$vote['maxtime']} 项");
    }
    
    // 验证选项是否存在
    foreach ($options as $optionId) {
        $option = $db->getOne('xuan', "id = $optionId AND topic_id = $topicId");
        if (!$option) {
            apiResponse(1, '选项不存在');
        }
    }
    
    // 开始事务
    $db->startTransaction();
    
    try {
        // 添加投票记录
        $ip = $_SERVER['REMOTE_ADDR'];
        $time = date('Y-m-d H:i:s');
        
        foreach ($options as $optionId) {
            $result = $db->insert('recs', [
                'topic_id' => $topicId,
                'user_id' => $user['id'],
                'option_id' => $optionId,
                'vote_time' => $time,
                'ip' => $ip
            ]);
            
            if (!$result) {
                throw new Exception('提交投票失败');
            }
        }
        
        // 记录日志
        writeLog($user['id'], 'vote', "参与投票：{$vote['title']}");
        
        // 提交事务
        $db->commit();
        
        apiResponse(0, '投票成功');
    } catch (Exception $e) {
        // 回滚事务
        $db->rollback();
        apiResponse(1, $e->getMessage());
    }
}

/**
 * 处理获取投票结果
 * @param array $params 请求参数
 * @param DB $db 数据库操作对象
 */
function handleGetVoteResult($params, $db) {
    // 获取投票ID
    $voteId = isset($params['id']) ? intval($params['id']) : 0;
    
    if (!$voteId) {
        apiResponse(1, '参数错误');
    }
    
    // 获取投票信息
    $vote = $db->getOne('vote', "id = $voteId");
    if (!$vote) {
        apiResponse(1, '投票不存在');
    }
    
    // 获取选项列表
    $options = $db->getAll('xuan', "topic_id = $voteId", '*', 'sort ASC, id ASC');
    if (empty($options)) {
        apiResponse(1, '暂无投票选项');
    }
    
    // 获取投票结果
    $sql = "SELECT option_id, COUNT(*) as vote_count FROM " . $db->table('recs') . " WHERE topic_id = $voteId GROUP BY option_id";
    $result = $db->query($sql);
    
    $voteResults = [];
    $totalVotes = 0;
    
    if ($result) {
        while ($row = $result->fetch_assoc()) {
            $voteResults[$row['option_id']] = $row['vote_count'];
            $totalVotes += $row['vote_count'];
        }
    }
    
    // 格式化结果
    $formattedResults = [];
    foreach ($options as $option) {
        $voteCount = isset($voteResults[$option['id']]) ? $voteResults[$option['id']] : 0;
        $percentage = $totalVotes > 0 ? round(($voteCount / $totalVotes) * 100, 1) : 0;
        
        $formattedResults[] = [
            'id' => $option['id'],
            'name' => $option['name'],
            'idesc' => $option['idesc'],
            'imgs' => $option['imgs'],
            'count' => $voteCount,
            'percentage' => $percentage
        ];
    }
    
    // 用户是否已投票
    $hasVoted = false;
    $userVotes = [];
    $user = checkLogin();
    
    if ($user) {
        $userVoteRecords = $db->getAll('recs', "topic_id = $voteId AND user_id = {$user['id']}");
        
        if (!empty($userVoteRecords)) {
            $hasVoted = true;
            foreach ($userVoteRecords as $record) {
                $userVotes[] = $record['option_id'];
            }
        }
    }
    
    apiResponse(0, '获取成功', [
        'vote' => $vote,
        'options' => $formattedResults,
        'totalVotes' => $totalVotes,
        'hasVoted' => $hasVoted,
        'userVotes' => $userVotes
    ]);
}

/**
 * 处理获取用户的投票记录
 * @param array $params 请求参数
 * @param DB $db 数据库操作对象
 */
function handleGetUserVotes($params, $db) {
    // 验证权限
    $user = checkLogin();
    if (!$user) {
        apiResponse(1, '请先登录');
    }
    
    // 获取分页参数
    $page = isset($params['page']) ? intval($params['page']) : 1;
    $pageSize = isset($params['pageSize']) ? intval($params['pageSize']) : 10;
    
    // 查询该用户参与的投票
    $sql = "SELECT DISTINCT v.* FROM " . $db->table('vote') . " v 
            INNER JOIN " . $db->table('recs') . " r ON v.id = r.topic_id 
            WHERE r.user_id = " . $user['id'] . " 
            ORDER BY r.vote_time DESC";
    
    $result = $db->query($sql);
    $myVotes = [];
    if ($result) {
        while ($row = $result->fetch_assoc()) {
            $myVotes[] = $row;
        }
    }
    
    // 计算分页信息
    $total = count($myVotes);
    $pagination = getPagination($total, $page, $pageSize);
    
    // 按分页截取数据
    $myVotesList = array_slice($myVotes, $pagination['offset'], $pagination['pageSize']);
    
    // 当前时间，用于判断投票状态
    $now = date('Y-m-d H:i:s');
    
    // 处理投票状态
    foreach ($myVotesList as &$vote) {
        $vote['status_text'] = '';
        $vote['status_class'] = '';
        
        if ($vote['status'] == 0) {
            $vote['status_text'] = '已禁用';
            $vote['status_class'] = 'vote-status-disabled';
        } else {
            if ($vote['statime'] > $now) {
                $vote['status_text'] = '未开始';
                $vote['status_class'] = 'vote-status-pending';
            } elseif ($vote['endtime'] < $now) {
                $vote['status_text'] = '已结束';
                $vote['status_class'] = 'vote-status-ended';
            } else {
                $vote['status_text'] = '进行中';
                $vote['status_class'] = 'vote-status-active';
            }
        }
    }
    
    apiResponse(0, '获取成功', [
        'list' => $myVotesList,
        'pagination' => $pagination
    ]);
}

/**
 * 统一API响应格式
 * @param int $code 状态码，0表示成功，非0表示失败
 * @param string $msg 提示信息
 * @param array $data 返回数据
 */
function apiResponse($code = 0, $msg = '', $data = []) {
    echo json_encode([
        'code' => $code,
        'msg' => $msg,
        'data' => $data
    ], JSON_UNESCAPED_UNICODE);
    exit;
}