SpiceManagementSystem/app/Filament/User/Resources/ProductResource/RelationManagers/BatchesRelationManager.php

<?php

namespace App\Filament\User\Resources\ProductResource\RelationManagers;

use App\Models\ProductSize;
use App\Models\Recipe;
use App\Models\Spice;
use Filament\Forms;
use Filament\Forms\Form;
use Filament\Forms\Get;
use Filament\Resources\RelationManagers\RelationManager;
use Filament\Tables;
use Filament\Tables\Table;
use Illuminate\Support\HtmlString;

class BatchesRelationManager extends RelationManager
{
    protected static string $relationship = 'batches';
    protected static ?string $title = 'Chargen (LOT)';
    protected static ?string $modelLabel = 'Charge';
    protected static ?string $pluralModelLabel = 'Chargen';

    public function form(Form $form): Form
    {
        return $form->schema([
            Forms\Components\TextInput::make('lot_number')
                ->label('LOT-Nummer')
                ->required()
                ->unique(ignoreRecord: true)
                ->maxLength(255),

            Forms\Components\Select::make('size_id')
                ->label('Variante (Verpackung)')
                ->options(fn () => ProductSize::with('packing')
                    ->where('product_id', $this->getOwnerRecord()->id)
                    ->get()
                    ->mapWithKeys(fn ($s) => [$s->id => $s->packing->name . ' ' . $s->packing->size . 'g'])
                )
                ->required()
                ->live(),

            Forms\Components\Select::make('recipe_id')
                ->label('Rezeptur')
                ->options(fn () => Recipe::where('product_id', $this->getOwnerRecord()->id)
                    ->orderByDesc('version')
                    ->get()
                    ->mapWithKeys(fn ($r) => [$r->id => 'v' . $r->version . ' · ' . $r->created_at->format('d.m.Y')])
                )
                ->default(fn () => $this->getOwnerRecord()->recipes_id)
                ->required()
                ->live()
                ->afterStateUpdated(function ($state, $set) {
                    if (! $state) {
                        $set('origins', []);
                        return;
                    }
                    $recipe = Recipe::with('spices')->find($state);
                    if (! $recipe) {
                        return;
                    }
                    $set('origins', $recipe->spices->map(fn ($s) => [
                        'spice_id'       => $s->id,
                        'supplier_id'    => null,
                        'origin_country' => null,
                        'farmer'         => null,
                        'notes'          => null,
                    ])->toArray());
                }),

            Forms\Components\TextInput::make('units_produced')
                ->label('Anzahl Einheiten')
                ->numeric()
                ->required()
                ->live(debounce: 400),

            Forms\Components\Placeholder::make('quantity_g_preview')
                ->label('Gesamtgewicht (berechnet)')
                ->content(function (Get $get): HtmlString {
                    $units  = (int) $get('units_produced');
                    $sizeId = $get('size_id');
                    if (! $units || ! $sizeId) {
                        return new HtmlString('<span class="text-gray-400">—</span>');
                    }
                    $size   = ProductSize::with('packing')->find($sizeId);
                    $totalG = $units * ($size?->packing?->size ?? 0);
                    return new HtmlString("<strong>{$totalG} g</strong> ({$units} × {$size?->packing?->size}g)");
                }),

            Forms\Components\DatePicker::make('produced_at')
                ->label('Produktionsdatum'),

            Forms\Components\DatePicker::make('expires_at')
                ->label('Mindesthaltbarkeitsdatum'),

            Forms\Components\Repeater::make('origins')
                ->label('Herkunft der Rohstoffe')
                ->relationship()
                ->afterStateHydrated(function ($component, $record, $livewire) {
                    // Pre-fill from product's current recipe only when creating a new batch
                    if ($record?->id) {
                        return;
                    }
                    $recipeId = $livewire->getOwnerRecord()->recipes_id;
                    if (! $recipeId) {
                        return;
                    }
                    $recipe = Recipe::with('spices')->find($recipeId);
                    if (! $recipe) {
                        return;
                    }
                    $component->state($recipe->spices->map(fn ($s) => [
                        'spice_id'       => $s->id,
                        'supplier_id'    => null,
                        'origin_country' => null,
                        'farmer'         => null,
                        'notes'          => null,
                    ])->toArray());
                })
                ->schema([
                    Forms\Components\Select::make('spice_id')
                        ->label('Rohstoff')
                        ->options(Spice::orderBy('name')->pluck('name', 'id'))
                        ->searchable()
                        ->required(),

                    Forms\Components\Select::make('supplier_id')
                        ->label('Lieferant')
                        ->relationship('supplier', 'name')
                        ->searchable()
                        ->preload()
                        ->nullable(),

                    Forms\Components\TextInput::make('origin_country')
                        ->label('Herkunftsland')
                        ->maxLength(100),

                    Forms\Components\TextInput::make('farmer')
                        ->label('Landwirt / Betrieb')
                        ->maxLength(255),

                    Forms\Components\Textarea::make('notes')
                        ->label('Notizen')
                        ->rows(2)
                        ->columnSpanFull(),
                ])
                ->columns(2)
                ->addActionLabel('Eintrag hinzufügen')
                ->columnSpanFull(),
        ]);
    }

    public function table(Table $table): Table
    {
        return $table
            ->recordTitleAttribute('lot_number')
            ->columns([
                Tables\Columns\TextColumn::make('lot_number')
                    ->label('LOT-Nummer')
                    ->searchable()
                    ->sortable(),

                Tables\Columns\TextColumn::make('units_produced')
                    ->label('Einheiten')
                    ->suffix(fn ($record) => $record->quantity_g
                        ? ' (' . number_format($record->quantity_g, 0, ',', '.') . 'g)'
                        : ''),

                Tables\Columns\TextColumn::make('recipe.version')
                    ->label('Rezeptur')
                    ->formatStateUsing(fn ($state) => $state ? 'v' . $state : '—'),

                Tables\Columns\TextColumn::make('produced_at')
                    ->label('Produktion')
                    ->date('d.m.Y')
                    ->sortable(),

                Tables\Columns\TextColumn::make('expires_at')
                    ->label('MHD')
                    ->date('d.m.Y')
                    ->sortable(),
            ])
            ->defaultSort('produced_at', 'desc')
            ->actions([
                Tables\Actions\EditAction::make(),
                Tables\Actions\DeleteAction::make(),
            ])
            ->headerActions([
                Tables\Actions\CreateAction::make(),
            ]);
    }
}