<?php

namespace App\Filament\Resources;

use App\Filament\Resources\PaperPartResource\Pages;
use App\Filament\Resources\PaperPartResource\RelationManagers\PreQuestionCandidatesRelationManager;
use App\Models\PaperPart;
use Filament\Forms;
use Filament\Resources\Resource;
use Filament\Schemas\Schema;
use Filament\Tables;
use Filament\Tables\Table;
use Filament\Actions\ViewAction;
use Filament\Actions\BulkAction;
use Illuminate\Database\Eloquent\Model;
use BackedEnum;
use UnitEnum;

class PaperPartResource extends Resource
{
    protected static ?string $model = PaperPart::class;

    protected static BackedEnum|string|null $navigationIcon = 'heroicon-o-clipboard-document-list';

    protected static UnitEnum|string|null $navigationGroup = '卷子导入流程';

    protected static ?string $navigationLabel = '题型区块';

    protected static ?int $navigationSort = 3;

    public static function canCreate(): bool
    {
        return false;
    }

    public static function canEdit(Model $record): bool
    {
        return true;
    }

    public static function form(Schema $schema): Schema
    {
        return $schema->schema([
            Forms\Components\TextInput::make('title')->label('标题'),
            Forms\Components\Select::make('type')
                ->label('题型')
                ->options([
                    'choice' => '选择题',
                    'fill' => '填空题',
                    'answer' => '解答题',
                    'mixed' => '混合',
                ]),
            Forms\Components\TextInput::make('question_count')->label('题量')->numeric(),
            Forms\Components\Textarea::make('raw_markdown')->label('区块 Markdown')->rows(12)->disabled(),
        ]);
    }

    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('paper.title')->label('卷子'),
                Tables\Columns\TextColumn::make('order')->label('顺序')->sortable(),
                Tables\Columns\TextInputColumn::make('title')->label('区块标题')->searchable(),
                Tables\Columns\SelectColumn::make('type')
                    ->label('题型')
                    ->options([
                        'choice' => '选择题',
                        'fill' => '填空题',
                        'answer' => '解答题',
                        'mixed' => '混合',
                    ]),
                Tables\Columns\TextInputColumn::make('question_count')
                    ->label('题量(人工)')
                    ->type('number'),
                Tables\Columns\TextColumn::make('candidates_count')
                    ->counts('candidates')
                    ->label('题量(自动)'),
                Tables\Columns\TextColumn::make('question_delta')
                    ->label('差异')
                    ->getStateUsing(fn (PaperPart $record) => ($record->question_count ?? 0) - ($record->candidates_count ?? $record->candidates()->count()))
                    ->badge()
                    ->color(fn (PaperPart $record) => (($record->question_count ?? 0) - ($record->candidates_count ?? $record->candidates()->count())) === 0 ? 'success' : 'warning'),
            ])
            ->filters([
                Tables\Filters\SelectFilter::make('source_paper_id')
                    ->label('卷子')
                    ->options(function () {
                        return \App\Models\SourcePaper::query()
                            ->orderByDesc('id')
                            ->get(['id', 'title', 'full_title'])
                            ->mapWithKeys(function ($paper) {
                                $label = $paper->title ?: $paper->full_title ?: '未命名卷子';
                                return [$paper->id => $label];
                            })
                            ->toArray();
                    }),
            ])
            ->actions([
                ViewAction::make(),
            ])
            ->bulkActions([
                BulkAction::make('bulk_type')
                    ->label('批量设置题型')
                    ->form([
                        Forms\Components\Select::make('type')
                            ->label('题型')
                            ->options([
                                'choice' => '选择题',
                                'fill' => '填空题',
                                'answer' => '解答题',
                                'mixed' => '混合',
                            ])
                            ->required(),
                    ])
                    ->action(function (array $data, $records) {
                        foreach ($records as $record) {
                            $record->update(['type' => $data['type']]);
                        }
                    }),
            ])
            ->recordClasses(fn (PaperPart $record) => ($record->question_count ?? 0) !== ($record->candidates_count ?? $record->candidates()->count()) ? 'bg-amber-50' : null);
    }

    public static function getRelations(): array
    {
        return [
            PreQuestionCandidatesRelationManager::class,
        ];
    }

    public static function getPages(): array
    {
        return [
            'index' => Pages\ListPaperParts::route('/'),
            'view' => Pages\ViewPaperPart::route('/{record}'),
        ];
    }
}