<?php

namespace app\api\controller\course;

use app\common\controller\Api;
use mysql_xdevapi\Collection;

/**
 * 课程
 */
class Column extends Api
{
    // 无需登录的接口,*表示全部
    protected $noNeedLogin = ['*'];
    protected $noNeedRight = '*';
    public function _initialize()
    {
        parent::_initialize();
        $this->columnDirModel = new \app\admin\model\course\ColumnDir;
        $this->model = new \app\admin\model\course\ColumnBind;
        $this->courseModel = new \app\admin\model\course\Course;
    }
    /**
     * 获取专栏目录
     * @return void
     */
    public function getDir(){

        $courseId = input("id");
        $row = $this->columnDirModel->courseIdGetList($courseId);
        return $this->success("获取成功",$row);
    }


    /**
     * 获取专栏所属课程
     * @return mixed
     */
    public function getCourse(){
        $courseId = input('id');
        $sort = input('sort','asc');

        $courseInfo = $this->courseModel->get($courseId);

        if(!$courseInfo){
            return $this->error("获取课程信息错误");
        }
        
        $list = $this->model
            ->with(['course'])
            ->where([
                'column_bind.column_id'=>$courseId,
                'course.status'=>1
            ])
            ->order("column_bind.sort {$sort}, column_bind.createtime {$courseInfo['column_update']}")
            ->select();

        //判断有没有订阅
        $isSubscription = \app\common\model\user\Subscription::getSubscriptionAuth($this->auth->id,$courseId);

        if(!empty($list)){
            foreach ($list as $index => $item){
                $item['course'] = $item['course']->toArray();
                $item->getRelation('course')->visible(['name','cover','id','updatetime','views','type','type_text','pay_type']);
                $item['course'] = $this->courseModel->structrue($item['course'],'decode');
                $item->visible(['id','course','try','subscription']);
                $isCourseSubscription = \app\common\model\user\Subscription::getSubscriptionAuth($this->auth->id,$item['course']['id']);

                if($isSubscription || $isCourseSubscription || $item->try){
                    $list[$index]['subscription'] = 1;
                }else{
                    $list[$index]['subscription'] = 0;
                }
            }
        }

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


    /**
     * 获取专栏目录 新
     * @return void
     */
    public function getColumnDir(){
        $courseId = input('id');
        $sort = input('sort','asc');

        $courseInfo = $this->courseModel->get($courseId);

        if(!$courseInfo){
            return $this->error("获取课程信息错误");
        }

        $list = $this->model
            ->with(['bindcourse'])
            ->where([
                'column_bind.column_id'=>$courseId,
            ])
            ->order("column_bind.sort {$sort}, column_bind.createtime {$courseInfo['column_update']}")
            ->select();


        //判断有没有订阅
        $isSubscription = \app\common\model\user\Subscription::getSubscriptionAuth($this->auth->id,$courseId);

        if(!empty($list)){
            foreach ($list as $index => &$item){
                $item->visible(['id','bindcourse','try','subscription','type','p_id','title']);
                $item->getRelation('bindcourse')->visible(['name','cover','id','updatetime','views','type','type_text','status','pay_type','no']);
                $item = $item->toArray();
                if($item['type'] == 1){
                    if(!$item['bindcourse']['id'] || $item['bindcourse']['status']!=1){
                        unset($list[$index]);
                        continue;
                    }
                    $item['bindcourse'] = $this->courseModel->structrue($item['bindcourse'],'decode');
                    $isCourseSubscription = \app\common\model\user\Subscription::getSubscriptionAuth($this->auth->id,$item['bindcourse']['id']);
                    if($isSubscription || $isCourseSubscription || $item['try']){
                        $list[$index]['subscription'] = 1;
                    }else{
                        $list[$index]['subscription'] = 0;
                    }
                }
            }
            //重新给数组排序
            $list = array_values($list);
        }

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

    /**
     * 获取下一课程
     * @return mixed
     */
    public function getNextCourse() {
        $courseId = input('course_id');
        $columnId = input('column_id');

        // 1. 验证专栏和课程是否存在
        $columnInfo = $this->courseModel->get($columnId);
        if (!$columnInfo) {
            return $this->success();
        }

        $courseInfo = $this->model->where(['column_id' => $columnId, 'course_id' => $courseId])->find();
        if (!$courseInfo) {
            return $this->success();
        }

        // 2. 关键修正：查询专栏下所有课程和目录（包含type=1和type=2）
        $allItems = $this->model
            ->with(['course'])
            ->where([
                'course.status'=>1
            ])
            ->where('column_id', $columnId)
            ->field('column_bind.id, column_bind.course_id, column_bind.type, column_bind.sort, column_bind.p_id, column_bind.createtime')
            ->select();

        if (empty($allItems)) {
            return $this->success();
        }

        // 3. 构建映射和子元素分组（方便快速查找父元素和子课程）
        $itemMap = [];       // 按 id 映射所有元素（id是column_bind表的主键）
        $childrenGroups = []; // 按 p_id 分组（p_id对应父目录的id）
        $courseIdToItemId = []; // 课程id -> column_bind.id 的映射（用于快速定位当前课程）
        foreach ($allItems as $item) {
            $itemMap[$item['id']] = $item;
            $pId = $item['p_id'];
            if (!isset($childrenGroups[$pId])) {
                $childrenGroups[$pId] = [];
            }
            $childrenGroups[$pId][] = $item;
            // 关联课程id和column_bind的id（因为传入的是course_id，不是column_bind的id）
            if ($item['type'] == 1) { // 只有课程有course_id
                $courseIdToItemId[$item['course_id']] = $item['id'];
            }
        }

        // 4. 筛选一级元素（p_id=0的课程/目录）并排序
        $level1Items = $childrenGroups[0] ?? [];
        usort($level1Items, function($a, $b) {
            // 排序规则：sort升序 -> createtime升序
            if ($a['sort'] != $b['sort']) {
                return $a['sort'] - $b['sort'];
            }
            return strcmp($a['createtime'], $b['createtime']);
        });

        // 5. 构建最终排序列表（一级元素 + 对应二级课程）
        $finalSortedList = [];
        foreach ($level1Items as $item) {
            $finalSortedList[] = $item;
            // 如果是目录，且有子课程，将子课程排序后追加
            if ($item['type'] == 2 && isset($childrenGroups[$item['id']])) {
                $children = $childrenGroups[$item['id']];
                // 子课程排序规则：sort升序 -> createtime升序
                usort($children, function($a, $b) {
                    if ($a['sort'] != $b['sort']) {
                        return $a['sort'] - $b['sort'];
                    }
                    return strcmp($a['createtime'], $b['createtime']);
                });
                $finalSortedList = array_merge($finalSortedList, $children);
            }
        }

        // 6. 找到当前课程在排序列表中的位置
        $currentItemId = $courseIdToItemId[$courseId] ?? null;
        $currentIndex = -1;
        foreach ($finalSortedList as $index => $item) {
            if ($item['id'] == $currentItemId) {
                $currentIndex = $index;
                break;
            }
        }

        // 7. 查找下一个课程（跳过目录，只找type=1的）
        $nextCourse = null;
        $listCount = count($finalSortedList);
        for ($i = $currentIndex + 1; $i < $listCount; $i++) {
            $candidate = $finalSortedList[$i];
            if ($candidate['type'] == 1) { // 只取课程
                $nextCourse = $candidate;
                break;
            }
        }

        if (!$nextCourse) {
            return $this->success('');
        }

        // 8. 关联课程详情并返回
        $nextCourseInfo = $this->courseModel->get($nextCourse['course_id']);
        if (!$nextCourseInfo) {
            return $this->success();
        }

        // 整理返回字段
        $result = $nextCourseInfo->visible(['name', 'column_id', 'cover', 'id', 'updatetime', 'views', 'type', 'type_text', 'status', 'pay_type', 'no'])->toArray();
        $result['column_id'] = $columnId;

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