<?php

namespace App\Filament\Resources;

use App\Filament\Resources\StudentResource\Pages;
use App\Models\Student;
use BackedEnum;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\Textarea;
use Filament\Forms\Components\TextInput;
use Filament\Resources\Resource;
use Filament\Schemas\Schema;
use Filament\Tables;
use Filament\Tables\Table;
use Illuminate\Support\Facades\DB;

class StudentResource extends Resource
{
    protected static ?string $model = Student::class;

    protected static BackedEnum | string | null $navigationIcon = 'heroicon-o-academic-cap';

    protected static bool $shouldRegisterNavigation = false;

    public static function form(Schema $schema): Schema
    {
        return $schema->components([
            TextInput::make('student_id')
                ->label('学生ID')
                ->numeric()
                ->required()
                ->disabled(fn (?Student $record) => filled($record)),
            TextInput::make('name')
                ->label('姓名')
                ->required()
                ->maxLength(128),
            TextInput::make('grade')
                ->label('年级')
                ->required()
                ->maxLength(32),
            TextInput::make('class_name')
                ->label('班级')
                ->required()
                ->maxLength(64),
            Select::make('teacher_id')
                ->label('指导老师')
                ->options(fn () => self::teacherOptions())
                ->searchable()
                ->required()
                ->preload(),
            Textarea::make('remark')
                ->label('备注')
                ->rows(3)
                ->columnSpanFull(),
        ])->columns(2);
    }

    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('student_id')
                    ->label('学生ID')
                    ->sortable()
                    ->searchable(),
                Tables\Columns\TextColumn::make('name')
                    ->label('姓名')
                    ->weight('bold')
                    ->searchable(),
                Tables\Columns\TextColumn::make('grade')
                    ->label('年级')
                    ->sortable(),
                Tables\Columns\TextColumn::make('class_name')
                    ->label('班级')
                    ->sortable(),
            ])
            ->filters([
                Tables\Filters\SelectFilter::make('grade')
                    ->label('年级')
                    ->options(fn () => self::gradeOptions()),
                Tables\Filters\SelectFilter::make('class_name')
                    ->label('班级')
                    ->options(fn () => self::classOptions()),
            ]);
    }

    public static function getPages(): array
    {
        return [
            'index' => Pages\ListStudents::route('/'),
            'create' => Pages\CreateStudent::route('/create'),
            'view' => Pages\ViewStudent::route('/{record}'),
            'edit' => Pages\EditStudent::route('/{record}/edit'),
        ];
    }

    protected static function teacherOptions(): array
    {
        return DB::table('teachers')
            ->join('users', 'teachers.user_id', '=', 'users.user_id')
            ->where('users.role', 'teacher')
            ->pluck('users.full_name', 'teachers.teacher_id')
            ->toArray();
    }

    protected static function gradeOptions(): array
    {
        return DB::table('students')
            ->distinct()
            ->orderBy('grade')
            ->pluck('grade', 'grade')
            ->toArray();
    }

    protected static function classOptions(): array
    {
        return DB::table('students')
            ->distinct()
            ->orderBy('class_name')
            ->pluck('class_name', 'class_name')
            ->toArray();
    }
}