<?php

namespace App\Services;

use App\Models\Course;
use App\Models\CourseSign;
use Illuminate\Support\Collection;

class SchoolmateAccessService
{
    /**
     * 是否有资格进入校友库（与 getUserInfo 中 enter_schoolmate 规则一致）
     */
    public static function canEnterSchoolmate(int $userId): bool
    {
        return self::qualifyingCourseSignsQuery($userId)->exists();
    }

    /**
     * 是否可查看指定课程的本班通讯录
     */
    public static function canViewCourseTxl(int $userId, int $courseId): bool
    {
        return CourseSign::where('user_id', $userId)
            ->where('course_id', $courseId)
            ->where('status', 1)
            ->exists();
    }

    /**
     * 审核通过且满足校友库准入条件的报名查询
     */
    public static function qualifyingCourseSignsQuery(int $userId)
    {
        return CourseSign::where('user_id', $userId)
            ->where('status', 1)
            ->where(function ($schoolmateQuery) {
                $schoolmateQuery->whereHas('course', function ($courseQuery) {
                    $courseQuery->where('is_fee', 1);
                })->orWhereHas('course', function ($courseQuery) {
                    $courseQuery->where('is_fee', 0)
                        ->where('free_enter_schoolmate', 1);
                });
            });
    }

    /**
     * 为列表用户计算 open_mobile 标记
     */
    public static function applyOpenMobileFlags(Collection $users, int $viewerUserId, ?Course $course = null): void
    {
        $userCourseSigns = CourseSign::where('user_id', $viewerUserId)->where('status', 1)->get();
        $coursesTypeIds = Course::whereIn('id', $userCourseSigns->pluck('course_id'))->pluck('type')->toArray();
        $courseShowMobile = $course ? (int) ($course->show_mobile ?? 0) : null;

        foreach ($users as $user) {
            $user->open_mobile = false;
            $courseIds = $user->courseSigns->where('status', 1)->pluck('course_id')->toArray();

            if (count(array_intersect($courseIds, $userCourseSigns->pluck('course_id')->toArray())) > 0) {
                $user->open_mobile = true;
            } else {
                $openCourseTypes = array_filter(explode(',', (string) ($user->open_course_types ?? '')));
                if (count(array_intersect($coursesTypeIds, $openCourseTypes)) > 0) {
                    $user->open_mobile = true;
                }
            }

            if ($courseShowMobile !== null && $courseShowMobile === 0) {
                $user->open_mobile = false;
            }
        }
    }
}