<?php

namespace App\Services\Schools;

use App\Models\Schools\SchoolCampus;
use App\Services\BaseService;
use Illuminate\Pagination\LengthAwarePaginator;

/**
 * 校区服务类
 */
class SchoolCampusService extends BaseService
{
    protected string $modelClass = SchoolCampus::class;

    /**
     * 获取校区列表
     */
    public function getList(array $params): LengthAwarePaginator
    {
        $query = SchoolCampus::query();

        // 搜索条件
        if (!empty($params['keyword'])) {
            $query->where(function ($q) use ($params) {
                $q->where('name', 'like', '%' . $params['keyword'] . '%')
                  ->orWhere('alias', 'like', '%' . $params['keyword'] . '%')
                  ->orWhere('code', 'like', '%' . $params['keyword'] . '%');
            });
        }

        // 状态筛选
        if (isset($params['status'])) {
            $query->where('status', $params['status']);
        }

        // 学校筛选
        if (!empty($params['school_id'])) {
            $query->where('school_id', $params['school_id']);
        }

        // 包含学校信息
        $query->with(['school:id,name,alias']);

        // 排序
        $query->orderBy('school_id', 'asc')->orderBy('id', 'desc');

        return $query->paginate($params['page_size'] ?? 15);
    }

    /**
     * 获取简单列表（用于下拉选择等）
     */
    public function getSimpleList(?int $schoolId = null): array
    {
        $query = SchoolCampus::select('id', 'name', 'alias', 'code', 'school_id')
            ->active()
            ->with(['school:id,name']);

        if ($schoolId) {
            $query->where('school_id', $schoolId);
        }

        return $query->get()->toArray();
    }

    /**
     * 获取指定用户管理的校区列表
     */
    public function getUserCampuses(int $userId): array
    {
        $campusIds = \App\Models\User::find($userId)->getCampusIds();

        return SchoolCampus::whereIn('id', $campusIds)
            ->active()
            ->with(['school:id,name'])
            ->get()
            ->toArray();
    }

    /**
     * 获取校区的班级列表
     */
    public function getCampusClasses(int $campusId): array
    {
        $campus = SchoolCampus::findOrFail($campusId);

        return $campus->classes()
            ->active()
            ->select('id', 'name', 'code', 'grade_id', 'number')
            ->orderBy('grade_id', 'asc')
            ->orderBy('number', 'asc')
            ->get()
            ->toArray();
    }

    /**
     * 获取校区统计信息
     */
    public function getCampusStats(int $campusId): array
    {
        $campus = SchoolCampus::findOrFail($campusId);

        return [
            'class_count' => $campus->classes()->active()->count(),
            'student_count' => \App\Models\Students\StudentClass::whereHas('schoolClass', function ($query) use ($campusId) {
                $query->where('campus_id', $campusId);
            })->count(),
            'teacher_count' => \App\Models\Teachers\TeacherClass::whereHas('schoolClass', function ($query) use ($campusId) {
                $query->where('campus_id', $campusId);
            })->distinct('teacher_id')->count(),
        ];
    }

    /**
     * 创建前的特殊处理
     */
    protected function beforeCreate(array &$data): void
    {
        // 设置默认值
        $data['status'] = $data['status'] ?? 1;
        $data['self_support'] = $data['self_support'] ?? 0;
        $data['is_open_user_login'] = $data['is_open_user_login'] ?? 0;

        // 验证学校是否存在
        if (!empty($data['school_id'])) {
            $school = \App\Models\Schools\School::find($data['school_id']);
            if (!$school) {
                throw new \InvalidArgumentException('指定的学校不存在');
            }
        }
    }

    /**
     * 更新前的特殊处理
     */
    protected function beforeUpdate(array &$data): void
    {
        // 移除不允许更新的字段
        unset($data['id']);

        // 验证学校是否存在
        if (!empty($data['school_id'])) {
            $school = \App\Models\Schools\School::find($data['school_id']);
            if (!$school) {
                throw new \InvalidArgumentException('指定的学校不存在');
            }
        }
    }
}