<?php

namespace app\admin\controller\data;

use app\common\controller\Backend;
use think\Db;
use PHPExcel_IOFactory;
/**
 * 专栏数据
 * @icon fa fa-circle-o
 */
class Column extends Backend
{
    protected $model = null;

    public function _initialize()
    {
        parent::_initialize();
        $this->model = new \app\admin\model\data\Study();
        $this->courseModel = new \app\admin\model\course\Course();
        $this->userModel = new \app\admin\model\User();
        $this->timeModel = new \app\admin\model\data\Time();
        $this->columnBindModel = new \app\admin\model\course\ColumnBind;
        $this->subscriptionModel = new \app\common\model\user\Subscription();
    }

    /**
     * 课程概况
     * @return void
     */
    public function total(){
        $this->request->filter(['strip_tags', 'trim']);
        $columnId = input('column_id', 0);


        // 1. 获取专栏下的所有课程ID
        $courseIds = $this->columnBindModel
            ->with(['course'])
            ->where(['course.status' => 1, 'column_id' => $columnId,'course_id'=>['<>',0]])
            ->column('course.id');

        // 2. 学员总数 (student_total)
        // 这里我们假设 $this->subscriptionModel 是用来获取订阅/报名该专栏的用户
        $studentTotal = $this->subscriptionModel->where(['course_id' => $columnId])->count();

        // 3. 小节总数 (section_total)
        // 如果你的“小节总数”实际上是“课程数”，请使用下面这行：
        $totalCourseCount = count($courseIds);

        if (empty($courseIds)) {
            return $this->success("获取成功", [
                'student_total' => $studentTotal,
                'section_total' => $totalCourseCount,
                'participate_count' => 0,
                'participate_rate' => 0.00,
                'finish_count' => 0,
                'finish_rate' => 0.00,
            ]);
        }

        // 构造基础查询条件
        $baseWhere = [
            's.uniacid' => UNIACID,
            's.course_id' => ['in', $courseIds],
            's.column_id'=>$columnId
        ];

        // 4. 参与人数 (participate_count)
        // 定义：至少学习了一个小节的去重用户数
        $participateCount = $this->model
            ->setUniacid(false)
            ->alias('s')
            ->where($baseWhere)
            ->count('DISTINCT s.user_id');

        // 5. 完成人数 (finish_count)
        // 子查询：计算每个用户完成了多少门课
        // 这里的逻辑是：一个用户在一门课中只要有一个小节标记为 finish=1，就认为他完成了这门课
        $finishedCoursesSubquery = $this->model
            ->setUniacid(false)
            ->alias('s')
            ->field('s.user_id, COUNT(DISTINCT s.course_id) as finished_course_count')
            ->where($baseWhere)
            ->where('s.finish', 1)
            ->group('s.user_id')
            ->buildSql();

        // 主查询：筛选出完成课程数等于总课程数的用户
        $finishCount = $this->model
            ->setUniacid(false)
            ->table("($finishedCoursesSubquery) AS user_finish_stats")
            ->where('user_finish_stats.finished_course_count', $totalCourseCount)
            ->count();

        // 6. 参与率 (participate_rate)
        $participateRate = $studentTotal > 0 && $participateCount
            ? floatval(($participateCount / $studentTotal))
            : 0.00;

        // 7. 完成率 (finish_rate)
        $finishRate = $studentTotal > 0 && $finishCount
            ? floatval(($finishCount / $studentTotal))
            : 0.00;

        // 组织最终结果
        $result = [
            'student_total' => $studentTotal,
            'section_total' => $totalCourseCount,
            'participate_count' => $participateCount,
            'participate_rate' => round($participateRate, 2),
            'finish_count' => $finishCount,
            'finish_rate' => round($finishRate, 2),
        ];

        return $this->success("获取成功", $result);
    }


    /**
     * 章节概括
     * @return void
     */
    public function userdetail(){
        $this->request->filter(['strip_tags', 'trim']);

        $columnId = input('column_id/d', 0);
        $userId   = input('user_id/d', 0);

        if (!$columnId || !$userId) {
            return $this->error("缺少必要参数");
        }

        // 1. 获取专栏所有课程
        $courseIds = $this->columnBindModel
            ->with(['course'])
            ->where(['course.status' => 1, 'column_id' => $columnId,'course_id'=>['<>',0]])
            ->column('course.id');

        if(!$courseIds){
            return $this->success("获取成功", []);
        }


        $studyList = $this->courseModel
            ->alias('course')
            ->join($this->model->getTable()." study", "study.course_id = course.id AND study.user_id = {$userId} AND study.column_id = {$columnId} AND study.uniacid = " . UNIACID, 'LEFT')
            ->where([
                'course.id' => ['in', $courseIds]
            ])
            ->field([
                'course.id as course_id',
                'course.name as course_name',
                'course.cover as course_cover',
                'course.type as course_type',
                'COUNT(study.id) AS record_count',
                'SUM(study.total_time) AS total_time_sec',
                'MAX(study.media_progress) AS media_progress_sec',
                'MIN(study.start_time) AS first_study_time',
                'MAX(study.end_time) AS last_study_time',
                'SUM(CASE WHEN study.finish = 1 THEN 1 ELSE 0 END) AS finish_count'
            ])
            ->group('course.id')
            ->order('total_time_sec','desc')
            ->select();

        foreach ($studyList as $cid => $row) {


            $row['course'] = [
                'id'      => $row['course_id'],
                'name'    => $row['course_name'],
                'cover'   => $row['course_cover'],
                'type'    => $row['course_type'],
            ];

            // 参与状态
            if ($row['finish_count'] > 0) {
                $row['status'] = '已完成';
            } elseif ($row['record_count'] > 0) {
                $row['status'] = '进行中';
            }
            // 时长（秒→分钟）
            $row['total_minutes'] = intval($row['total_time_sec']);
            // 观看进度
            $row['progress_minutes'] = intval($row['media_progress_sec']);
            // 时间格式
            $row['first_study_time'] = $row['first_study_time'] ? date('Y-m-d H:i:s', $row['first_study_time']) : '-';
            $row['last_study_time']  = $row['last_study_time']  ? date('Y-m-d H:i:s', $row['last_study_time']) : '-';

            $result[] = $row;
        }

        return $this->success("获取成功", $result);

    }

    /**
     * 章节概括
     * @return void
     */
    public function course(){
        $this->request->filter(['strip_tags','trim']);

        $columnId = input('column_id/d', 0);
        if (!$columnId) {
            return $this->error("缺少必要参数");
        }

        // 1. 获取专栏内所有课程
        $courses = $this->courseModel
            ->alias('c')
            ->join($this->columnBindModel->getTable()." cb", "cb.course_id = c.id AND cb.column_id = {$columnId}", 'LEFT')
            ->where(['c.status' => 1,'cb.course_id'=>['<>',0]])
            ->field('c.id,c.name,c.cover,c.type')
            ->group('cb.course_id')
            ->select();

        if (!$courses) {
            return $this->success("获取成功", ['total' => 0, 'rows' => []]);
        }

        $courseIds = array_column($courses, 'id');

        // 2. 统计每门课程参与人数和完成人数
        $studyStats = $this->model
            ->alias('s')
            ->where(['s.column_id' => $columnId, 's.uniacid' => UNIACID])
            ->whereIn('s.course_id', $courseIds)
            ->field([
                's.course_id',
                'COUNT(DISTINCT s.user_id) AS participate_user_count',
                'SUM(CASE WHEN s.finish = 1 THEN 1 ELSE 0 END) AS finish_user_count'
            ])
            ->group('s.course_id')
            ->select();


        // 3. 建立课程ID映射
        $statsMap = [];
        foreach ($studyStats as $stat) {
            $statsMap[$stat['course_id']] = $stat;
        }

        // 4. 计算专栏总用户数（用于参与率）
        $totalUserCount = $this->subscriptionModel
            ->where(['course_id' => $columnId])
            ->count();

        // 5. 构造结果
        $result = [];
        foreach ($courses as $course) {
            $cid = $course['id'];
            $participate = isset($statsMap[$cid]) ? (int)$statsMap[$cid]['participate_user_count'] : 0;
            $finish = isset($statsMap[$cid]) ? (int)$statsMap[$cid]['finish_user_count'] : 0;

            $result[] = [
                'course' => [
                    'id' => $course['id'],
                    'name' => $course['name'],
                    'cover' => $course['cover'],
                    'type' => $course['type'],
                ],
                'participate_user_count' => $participate,
                'participate_rate' => $totalUserCount > 0 && $participate ? number_format($participate / $totalUserCount * 100, 2) . '%' : '0%',
                'finish_user_count' => $finish,
                'finish_rate' => $participate > 0 && $totalUserCount ? number_format($finish / $totalUserCount * 100, 2) . '%' : '0%',
            ];
        }

        return $this->success("获取成功", ['total' => count($result), 'rows' => $result]);
    }


    protected $exportCourseIndex = 0;

    public function courseDownload(){
        $this->request->filter(['strip_tags','trim']);

        $columnId = input('column_id/d', 0);
        if (!$columnId) {
            return $this->error("缺少必要参数");
        }

        // 1. 获取专栏内所有课程
        $courses = $this->courseModel
            ->alias('c')
            ->join($this->columnBindModel->getTable()." cb", "cb.course_id = c.id AND cb.column_id = {$columnId}", 'LEFT')
            ->where(['c.status' => 1,'cb.course_id'=>['<>',0]])
            ->field('c.id,c.name')
            ->group('cb.course_id')
            ->select();

        if (!$courses) {
            return $this->error("未获取到相关课程");
        }

        $courseIds = array_column($courses, 'id');

        // 2. 统计每门课程参与人数和完成人数
        $studyStats = $this->model
            ->alias('s')
            ->where(['s.column_id' => $columnId, 's.uniacid' => UNIACID])
            ->whereIn('s.course_id', $courseIds)
            ->field([
                's.course_id',
                'COUNT(DISTINCT s.user_id) AS participate_user_count',
                'SUM(CASE WHEN s.finish = 1 THEN 1 ELSE 0 END) AS finish_user_count'
            ])
            ->group('s.course_id')
            ->select();


        // 3. 建立课程ID映射
        $statsMap = [];
        foreach ($studyStats as $stat) {
            $statsMap[$stat['course_id']] = $stat;
        }

        // 4. 计算专栏总用户数（用于参与率）
        $totalUserCount = $this->subscriptionModel
            ->where(['course_id' => $columnId])
            ->count();

        $excelTitle = '小节概况【'.date('Y-m-d h:i',time()).'】';

        $objPHPExcel = new \PHPExcel();
        //设置Excel属性
        $objPHPExcel->getProperties()
            ->setTitle($excelTitle);		//设置标题

        $objPHPExcel->getActiveSheet()->setCellValue('A1', '课程');//可以指定位置
        $objPHPExcel->getActiveSheet()->setCellValue('B1', '参与人数');//可以指定位置
        $objPHPExcel->getActiveSheet()->setCellValue('C1', '参与率');
        $objPHPExcel->getActiveSheet()->setCellValue('D1', '完成人数');
        $objPHPExcel->getActiveSheet()->setCellValue('E1', '完成率');


        foreach ($courses as $course) {
            $cid = $course['id'];
            $participate = isset($statsMap[$cid]) ? (int)$statsMap[$cid]['participate_user_count'] : 0;
            $finish = isset($statsMap[$cid]) ? (int)$statsMap[$cid]['finish_user_count'] : 0;
            $objPHPExcel->getActiveSheet()->setCellValue('A'.(2 + $this->exportCourseIndex), $course['name']);
            $objPHPExcel->getActiveSheet()->setCellValue('B'.(2 + $this->exportCourseIndex), $participate);
            $objPHPExcel->getActiveSheet()->setCellValue('C'.(2 + $this->exportCourseIndex), ($totalUserCount > 0 && $participate? number_format($participate / $totalUserCount * 100, 2) . '%' : '0%'));
            $objPHPExcel->getActiveSheet()->setCellValue('D'.(2 + $this->exportCourseIndex), $finish);
            $objPHPExcel->getActiveSheet()->setCellValue('E'.(2 + $this->exportCourseIndex), ($participate > 0 && $finish ? number_format($finish / $totalUserCount * 100, 2) . '%' : '0%'));
            $this->exportCourseIndex++;
        }


        //设置字体
        $objPHPExcel->getActiveSheet()->getStyle('A1:E1')->getFont()->setBold(true)->getColor()->setARGB(\PHPExcel_Style_Color::COLOR_BLACK);
        //设置水平居中
        $objPHPExcel->getActiveSheet()->getStyle('A1:E1')->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
        //设置背景颜色
        $objPHPExcel->getActiveSheet()->getStyle('A1:E1')->getFill()->setFillType(\PHPExcel_Style_Fill::FILL_SOLID)->getStartColor()->setARGB('D9FFC125');
        $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(20);
        $objPHPExcel->getActiveSheet()->getColumnDimension('B')->setWidth(15);
        $objPHPExcel->getActiveSheet()->getColumnDimension('C')->setWidth(15);
        $objPHPExcel->getActiveSheet()->getColumnDimension('D')->setWidth(18);
        $objPHPExcel->getActiveSheet()->getColumnDimension('E')->setWidth(18);
        //激活当前表
        $objPHPExcel->setActiveSheetIndex(0);
        ob_end_clean();//清除缓冲区,避免乱码

        //弹出提示下载文件
        header('pragma:public');
        header("Content-Disposition:attachment;filename={$excelTitle}.xlsx");
        header('Cache-Control: max-age=0');
        $objWriter = PHPExcel_IOFactory:: createWriter($objPHPExcel, 'Excel2007');

        $objWriter->save( 'php://output');
    }


    /**
     * 学员详情（包含未参与学习的用户）
     */
    public function user()
    {
        $this->request->filter(['strip_tags', 'trim']);
        $columnId = input('column_id/d', 0);

        if (!$columnId) {
            return $this->error("缺少必要参数");
        }

        list($where, $sort, $order, $offset, $limit) = $this->buildparams();

        // 1. 复用工具方法：获取订阅学员列表（带分页）
        $subscriptionResult = $this->getSubscriptionUsers($columnId, $limit);
        $userList = $subscriptionResult['userList'];
        $pagination = $subscriptionResult['pagination'];

        if (empty($userList)) {
            return $this->success("获取成功", [
                "total"               => 0,
                "rows"                => [],
                "total_section_count" => 0
            ]);
        }

        // 2. 复用工具方法：获取学员学习统计数据
        $statResult = $this->getUserStudyStats($columnId, $userList);
        $map = $statResult['map'];
        $hasStudyUserIds = $statResult['hasStudyUserIds'];
        $totalSectionCount = $statResult['totalSectionCount'];

        // 3. 复用工具方法：组装学员详情数据
        $rows = $this->assembleUserDetailData($userList, $map, $hasStudyUserIds, $totalSectionCount);

        // 4. 自定义排序（当前方法特有逻辑）
        usort($rows, function($a, $b) use ($sort, $order) {
            if ($a['sort_flag'] != $b['sort_flag']) {
                return $b['sort_flag'] - $a['sort_flag'];
            }
            if (empty($sort)) {
                return 0;
            }
            $fieldA = $a[$sort] ?? 0;
            $fieldB = $b[$sort] ?? 0;
            if (in_array($sort, ['first_study_time', 'last_study_time'])) {
                $fieldA = $fieldA != '-' ? strtotime($fieldA) : 0;
                $fieldB = $fieldB != '-' ? strtotime($fieldB) : 0;
            }
            return $order == 'desc' ? $fieldB - $fieldA : $fieldA - $fieldB;
        });

        return $this->success("获取成功", [
            "total"               => $pagination->total(),
            "rows"                => $rows,
            "total_section_count" => $totalSectionCount
        ]);
    }

    /**
     * 学员详情导出
     */
    public function userDownload()
    {
        $this->request->filter(['strip_tags', 'trim']);
        $columnId = input('column_id/d', 0);

        if (!$columnId) {
            return $this->error("缺少必要参数：column_id");
        }

        // 1. 复用工具方法：获取订阅学员列表（无分页）
        $subscriptionResult = $this->getSubscriptionUsers($columnId, 0);
        $userList = $subscriptionResult['userList'];

        if (empty($userList)) {
            return $this->error("无学员数据可导出");
        }

        // 2. 复用工具方法：获取学员学习统计数据
        $statResult = $this->getUserStudyStats($columnId, $userList);
        $map = $statResult['map'];
        $totalSectionCount = $statResult['totalSectionCount'];

        // 3. 组装导出数据（当前方法特有逻辑）
        $exportData = $this->assembleExportData($userList, $map, $totalSectionCount);

        // 4. 排序（导出特有排序：participated_count降序）
        usort($exportData, function($a, $b) {
            return $b['participated_count'] - $a['participated_count'];
        });

        // 5. 执行导出（Excel逻辑不变）
        $this->exportExcel($exportData);
    }

    /**
     * 工具方法：获取专栏订阅学员列表
     * @param int $columnId 专栏ID
     * @param int $limit 分页条数（0表示无分页）
     * @return array ['userList' => 学员列表, 'pagination' => 分页对象（无分页时为null）]
     */
    private function getSubscriptionUsers(int $columnId, int $limit = 0)
    {
        $result = [
            'userList' => [],
            'pagination' => null
        ];

        // 构建查询
        $query = $this->subscriptionModel
            ->with(['user', 'mobileuser'])
            ->distinct(true)
            ->where(['course_id' => $columnId])
            ->group('subscription.id');

        // 分页/无分页处理
        if ($limit > 0) {
            $pagination = $query->paginate($limit);
            $result['pagination'] = $pagination;
            $list = $pagination->items();
        } else {
            $list = $query->select();
        }

        // 整理学员数据（user/mobileuser统一格式）
        if ($list) {
            foreach ($list as &$row) {
                if ($row->user->id) {
                    $row->getRelation('user')->visible(\app\admin\model\User::$listShowField);
                    $row->user->user_id = $row->user->id;
                    $result['userList'][] = $row->user;
                    continue;
                }
                if ($row->mobileuser->id) {
                    $row->getRelation('mobileuser')->visible(\app\admin\model\User::$listShowField);
                    $row->mobileuser->user_id = $row->mobileuser->id;
                    $result['userList'][] = $row->mobileuser;
                    continue;
                }
            }
        }

        return $result;
    }

    /**
     * 工具方法：获取学员学习统计数据
     * @param int $columnId 专栏ID
     * @param array $userList 学员列表（含user_id）
     * @return array ['map' => 学习数据映射, 'hasStudyUserIds' => 有学习记录的用户ID, 'totalSectionCount' => 专栏总课程数]
     */
    private function getUserStudyStats(int $columnId, array $userList)
    {
        $userIds = array_column($userList, "user_id");

        // 统计学习数据
        $studyStats = $this->model
            ->alias("s")
            ->where([
                "s.column_id" => $columnId,
                "s.uniacid"   => UNIACID
            ])
            ->whereIn("s.user_id", $userIds)
            ->field([
                's.user_id',
                'COUNT(s.id) AS participated_count',
                'SUM(CASE WHEN s.finish = 1 THEN 1 ELSE 0 END) AS finished_count',
                'SUM(s.total_time) AS total_study_time_minutes',
                'MIN(s.start_time) AS first_study_time',
                'MAX(s.end_time) AS last_study_time',
            ])
            ->group("s.user_id")
            ->select();

        // 构建映射和有学习记录的用户ID列表
        $map = [];
        $hasStudyUserIds = [];
        foreach ($studyStats as $row) {
            $map[$row['user_id']] = $row;
            $hasStudyUserIds[] = $row['user_id'];
        }

        // 获取专栏总课程数
        $courseIds = $this->columnBindModel
            ->where(['status' => 1, 'column_id' => $columnId])
            ->column('course_id');
        $totalSectionCount = count($courseIds);

        return [
            'map' => $map,
            'hasStudyUserIds' => $hasStudyUserIds,
            'totalSectionCount' => $totalSectionCount
        ];
    }

    /**
     * 工具方法：组装学员详情页数据（带排序标识）
     * @param array $userList 学员列表
     * @param array $map 学习数据映射
     * @param array $hasStudyUserIds 有学习记录的用户ID
     * @param int $totalSectionCount 专栏总课程数
     * @return array 组装后的详情数据
     */
    private function assembleUserDetailData(array $userList, array $map, array $hasStudyUserIds, int $totalSectionCount)
    {
        $rows = [];
        foreach ($userList as $user) {
            $uid = $user["user_id"];
            $stat = $map[$uid] ?? [
                "participated_count" => 0,
                "finished_count"     => 0,
                "first_study_time"   => null,
                "last_study_time"    => null,
                "total_study_time_minutes" => 0,
            ];

            $participated = intval($stat["participated_count"]);
            $finished = intval($stat["finished_count"]);

            $rows[] = [
                "sort_flag" => in_array($uid, $hasStudyUserIds) ? 1 : 0,
                "user" => [
                    "id"       => $uid,
                    "username" => $user["username"],
                    "nickname" => $user["nickname"],
                    "avatar"   => $user["avatar"],
                ],
                "participated_count" => $participated,
                "finished_count"     => $finished,
                "participated_rate" => $totalSectionCount && $participated ? number_format($participated / $totalSectionCount * 100, 2) . "%" : "0%",
                "completion_rate"   => $totalSectionCount && $finished ? number_format($finished / $totalSectionCount * 100, 2) . "%" : "0%",
                "study_status" => $participated == 0 ? "未参与" : ($finished >= $totalSectionCount ? "已完成" : "进行中"),
                "first_study_time" => $stat["first_study_time"] ? date("Y-m-d H:i:s", $stat["first_study_time"]) : "-",
                "last_study_time"  => $stat["last_study_time"] ? date("Y-m-d H:i:s", $stat["last_study_time"]) : "-",
                "total_study_time_minutes" => intval($stat["total_study_time_minutes"]),
            ];
        }
        return $rows;
    }

    /**
     * 工具方法：组装导出数据
     * @param array $userList 学员列表
     * @param array $map 学习数据映射
     * @param int $totalSectionCount 专栏总课程数
     * @return array 导出格式数据
     */
    private function assembleExportData(array $userList, array $map, int $totalSectionCount)
    {
        $exportData = [];
        foreach ($userList as $user) {
            $uid = $user["user_id"];
            $stat = $map[$uid] ?? [
                "participated_count" => 0,
                "finished_count"     => 0,
                "first_study_time"   => null,
                "last_study_time"    => null,
                "total_study_time_minutes" => 0,
            ];

            $participated = intval($stat["participated_count"]);
            $finished = intval($stat["finished_count"]);

            $exportData[] = [
                'username' => $user["username"] ?? "未知用户",
                'study_status' => $participated == 0 ? "未参与" : ($finished >= $totalSectionCount ? "已完成" : "进行中"),
                'participated_count' => $participated,
                'participated_rate' => $totalSectionCount && $participated ? number_format($participated / $totalSectionCount * 100, 2) . "%" : "0%",
                'finished_count' => $finished,
                'completion_rate' => $totalSectionCount && $finished ? number_format($finished / $totalSectionCount * 100, 2) . "%" : "0%",
                'first_study_time' => $stat["first_study_time"] ? date("Y-m-d H:i:s", $stat["first_study_time"]) : "-",
                'last_study_time' => $stat["last_study_time"] ? date("Y-m-d H:i:s", $stat["last_study_time"]) : "-",
                'total_study_time' => number_format((float)$stat["total_study_time_minutes"] / 60, 1) . " 分钟",
            ];
        }
        return $exportData;
    }

    /**
     * 工具方法：Excel导出执行
     * @param array $exportData 导出数据
     */
    private function exportExcel(array $exportData)
    {
        $excelTitle = '学员详情【' . date('Y-m-d H:i', time()) . '】';
        $objPHPExcel = new \PHPExcel();

        // 设置Excel属性和表头
        $objPHPExcel->getProperties()->setTitle($excelTitle);
        $headers = [
            'A1' => '学员用户名', 'B1' => '课程参与状态', 'C1' => '小节参与数',
            'D1' => '小节参与率', 'E1' => '小节完成数', 'F1' => '小节完成率',
            'G1' => '首次学习时间', 'H1' => '最后学习时间', 'I1' => '学习时长(分钟)'
        ];
        foreach ($headers as $cell => $title) {
            $objPHPExcel->getActiveSheet()->setCellValue($cell, $title);
        }

        // 填充数据
        $startRow = 2;
        foreach ($exportData as $data) {
            $objPHPExcel->getActiveSheet()
                ->setCellValue('A' . $startRow, $data['username'])
                ->setCellValue('B' . $startRow, $data['study_status'])
                ->setCellValue('C' . $startRow, $data['participated_count'])
                ->setCellValue('D' . $startRow, $data['participated_rate'])
                ->setCellValue('E' . $startRow, $data['finished_count'])
                ->setCellValue('F' . $startRow, $data['completion_rate'])
                ->setCellValue('G' . $startRow, $data['first_study_time'])
                ->setCellValue('H' . $startRow, $data['last_study_time'])
                ->setCellValue('I' . $startRow, $data['total_study_time']);
            $startRow++;
        }

        // 设置样式
        $objPHPExcel->getActiveSheet()->getStyle('A1:I1')->getFont()->setBold(true)->getColor()->setARGB(\PHPExcel_Style_Color::COLOR_BLACK);
        $objPHPExcel->getActiveSheet()->getStyle('A1:I1')->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
        $objPHPExcel->getActiveSheet()->getStyle('A1:I1')->getFill()->setFillType(\PHPExcel_Style_Fill::FILL_SOLID)->getStartColor()->setARGB('D9FFC125');
        $columnWidths = ['A' => 20, 'B' => 15, 'C' => 15, 'D' => 18, 'E' => 18, 'F' => 18, 'G' => 20, 'H' => 20, 'I' => 16];
        foreach ($columnWidths as $column => $width) {
            $objPHPExcel->getActiveSheet()->getColumnDimension($column)->setWidth($width);
        }

        // 导出响应
        $objPHPExcel->setActiveSheetIndex(0);
        ob_end_clean();
        header('pragma:public');
        header("Content-Disposition:attachment;filename={$excelTitle}.xlsx");
        header('Cache-Control: max-age=0');
        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
        $objWriter->save('php://output');
    }

// 原有的导出索引属性（当前已无需使用，可删除）
// protected $exportUserIndex = 0;
}