<?php
//播放视频流程 
//传入openid、口令码
//查询数据库中课程对应口令码
//用口令码注册课程 返回拥有的课程
//认证失败 返回null

// 声明JSON内容类型
header('Content-Type: application/json');

// 获取传入的 OpenID 值
$openid = $_GET['openid'];

// 获取传入的 课程ID 值
$passwordcode = $_GET['PasswordCode'];


// 引用配置，建立数据库连接
require_once 'ApiConfig.php';
$conn = new mysqli(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
$result1_end_data=null;
$courseid=null;
$coursename=null;
$courseinfo=null;
$result1_end_data=null;
$coursedate=null;
$returndata=null;
$codecount=null;


// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

//查询用户是否存在
$sql00 = "SELECT * FROM 用户信息 WHERE OpenID='$openid'";
$result00 = $conn->query($sql00);
if ($result00->num_rows > 0){
    
    // 用户存在 则查询数据库中符合条件的记录
$sql = "SELECT * FROM 课程口令码 WHERE 口令码='$passwordcode' AND 剩余有效次数 > 0";
$result1 = $conn->query($sql);

// 如果查询结果不为空，则进行二次查询
if ($result1->num_rows > 0) {
    $row1 = $result1->fetch_assoc();
    $result1_end_data=$row1['口令结束日期'];
    $courseid= $row1['课程id'];
    $coursename= $row1['课程'];
    $courseinfo= $row1['课程介绍'];
    $codecount= $row1['剩余有效次数'];
    //$coursedate= $row1['购课日期'];
    
    // 获取当前时间戳
    $currentDateTime = strtotime(date('Y-m-d H:i:s'));
    // 将口令结束日期转换为时间戳
    $endTime = strtotime($result1_end_data);
    
    // 查询数据库的 用户已购课程 表
    $sql2 = "SELECT * FROM 用户已购课程 WHERE OpenID='$openid' AND 课程id='$courseid'";
    $result2 = $conn->query($sql2);
    
    //用户已经购买了课程
    if ($result2->num_rows > 0) {
        // 这里返回提示即可
        echo json_encode(["result" => "成功", "Data" => "您已购买该课程！", "ReturnData" => $returndata]);
    } else if (($result2->num_rows === 0)&&($currentDateTime < $endTime)) {
            //用户未购买课程 验证日期有效性后添加信息即可
    $sql3="INSERT INTO 用户已购课程 (OpenID, 课程id, 课程, 课程介绍, 购课日期) VALUES ('$openid','$courseid','$coursename','$courseinfo', NOW())";
    if ($conn->query($sql3) === TRUE) {
        //口令码有效次数减 1 操作
        $codecount=$codecount-1;
        $sql5 = "UPDATE `课程口令码` SET `剩余有效次数` = '$codecount' WHERE `口令码` = '$passwordcode'";
        $result5 = $conn->query($sql5);
        
        
    //查询插入后的信息
    $sql4 = "SELECT * FROM 用户已购课程 WHERE OpenID='$openid'";
    $result4 = $conn->query($sql4);
    if ($result4->num_rows > 0) {
        // 这里返回所有已经购买的课程
        $data = array();
        while ($row = $result4->fetch_assoc()) {
            $data[] = $row;
        };
        $returndata = $data;
        echo json_encode(["result" => "添加成功！", "Data" => "课程添加成功", "ReturnData" => $returndata]);
    } else {
        echo json_encode(["result" => "插入信息查询失败！", "Data" => "课程添加成功", "ReturnData" => $returndata]);
    }
    

} else {
echo json_encode(["result" => "添加失败！", "Data" => "课程添加失败", "ReturnData" => $returndata]);
};
    } else {
        echo json_encode(["result" => "失败", "Data" => "口令码已失效", "ReturnData" => $returndata]);};
} else {
    echo json_encode(["result" => "失败", "Data" => "口令码无效", "ReturnData" => $returndata]);
}
    
} else {
    echo json_encode(["result" => "失败", "Data" => "该用户不存在", "ReturnData" => $returndata]);
};


// 关闭数据库连接
$conn->close();
?>