<?php

namespace App\Services\Schools;

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

/**
 * 班级服务类
 */
class SchoolClassService extends BaseService
{
    protected string $modelClass = SchoolClass::class;

    /**
     * 获取班级列表
     */
    public function getList(array $params): LengthAwarePaginator
    {
        $query = SchoolClass::query();

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

        // 校区筛选
        if (!empty($params['campus_id'])) {
            $query->where('campus_id', $params['campus_id']);
        }

        // 年级筛选
        if (!empty($params['grade_id'])) {
            $query->where('grade_id', $params['grade_id']);
        }

        // 班级类型筛选
        if (isset($params['type'])) {
            $query->where('type', $params['type']);
        }

        // 包含学校和校区信息
        $query->with(['school:id,name,alias', 'campus:id,name,alias']);

        // 排序
        $query->orderBy('school_id', 'asc')
              ->orderBy('campus_id', 'asc')
              ->orderBy('grade_id', 'asc')
              ->orderBy('number', 'asc');

        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, ?int $campusId = null): array
    {
        $query = SchoolClass::select('id', 'name', 'code', 'school_id', 'campus_id', 'grade_id', 'number')
            ->active()
            ->with(['school:id,name', 'campus:id,name']);

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

        if ($campusId) {
            $query->where('campus_id', $campusId);
        }

        return $query->orderBy('grade_id', 'asc')
                     ->orderBy('number', 'asc')
                     ->get()
                     ->toArray();
    }

    /**
     * 获取指定用户管理的班级列表
     */
    public function getUserClasses(int $userId): array
    {
        $classIds = \App\Models\User::find($userId)->getClassIds();

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

    /**
     * 获取班级的学生列表
     */
    public function getClassStudents(int $classId): array
    {
        $class = SchoolClass::findOrFail($classId);

        return $class->studentClasses()
            ->with(['student:id,name,sno']) // 假设有学生模型
            ->get()
            ->toArray();
    }

    /**
     * 获取班级的老师列表
     */
    public function getClassTeachers(int $classId): array
    {
        $class = SchoolClass::findOrFail($classId);

        return $class->teacherClasses()
            ->with(['teacher:id,username,nickname'])
            ->get()
            ->toArray();
    }

    /**
     * 获取班级统计信息
     */
    public function getClassStats(int $classId): array
    {
        $class = SchoolClass::findOrFail($classId);

        return [
            'student_count' => $class->studentClasses()->count(),
            'teacher_count' => $class->teacherClasses()->count(),
            'headman_count' => $class->teacherClasses()->headman()->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['type'] = $data['type'] ?? 0;
        $data['level'] = $data['level'] ?? 0;
        $data['number'] = $data['number'] ?? 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');
            }
        }

        // 验证校区是否存在
        if (!empty($data['campus_id'])) {
            $campus = \App\Models\Schools\SchoolCampus::find($data['campus_id']);
            if (!$campus) {
                throw new \InvalidArgumentException('指定的校区不存在');
            }

            // 验证校区是否属于指定学校
            if ($campus->school_id !== $data['school_id']) {
                throw new \InvalidArgumentException('指定的校区不属于该学校');
            }
        }
    }

    /**
     * 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');
            }
        }

        // 验证校区是否存在
        if (!empty($data['campus_id'])) {
            $campus = \App\Models\Schools\SchoolCampus::find($data['campus_id']);
            if (!$campus) {
                throw new \InvalidArgumentException('指定的校区不存在');
            }

            // 验证校区是否属于指定学校
            if (isset($data['school_id']) && $campus->school_id !== $data['school_id']) {
                throw new \InvalidArgumentException('指定的校区不属于该学校');
            }
        }
    }
}