<?php

namespace App\Filament\User\Resources;

use App\Filament\User\Resources\BatchResource\Pages;
use App\Models\Batch;
use App\Models\Farmer;
use App\Models\Product;
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\Resource;
use Illuminate\Support\HtmlString;
use Filament\Tables;
use Filament\Tables\Table;

class BatchResource extends Resource
{
    protected static ?string $model = Batch::class;
    protected static ?string $navigationIcon = 'heroicon-o-qr-code';
    protected static ?string $navigationLabel = 'Chargen (LOT)';
    protected static ?string $modelLabel = 'Charge';
    protected static ?string $pluralModelLabel = 'Chargen';
    protected static ?string $navigationGroup = 'Produkte';
    protected static ?int $navigationSort = 3;

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

                Forms\Components\Select::make('product_id')
                    ->label('Produkt')
                    ->relationship('product', 'title')
                    ->searchable()
                    ->preload()
                    ->required()
                    ->live()
                    ->afterStateUpdated(function ($state, $set) {
                        $set('size_id', null);
                        $set('recipe_id', null);
                        $set('origins', []);
                        if (! $state) {
                            return;
                        }
                        $product = Product::find($state);
                        if ($product?->recipes_id) {
                            $set('recipe_id', $product->recipes_id);
                            $recipe = Recipe::with('spices')->find($product->recipes_id);
                            if ($recipe) {
                                $set('origins', $recipe->spices->map(fn ($s) => [
                                    'spice_id' => $s->id,
                                    'entries'  => [['supplier_id' => null, 'origin_country' => null, 'farmer_id' => null, 'notes' => null]],
                                ])->toArray());
                            }
                        }
                    }),

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

                Forms\Components\Select::make('recipe_id')
                    ->label('Rezeptur')
                    ->options(fn (Get $get) => Recipe::where('product_id', $get('product_id') ?? 0)
                        ->orderByDesc('version')
                        ->get()
                        ->mapWithKeys(fn ($r) => [$r->id => 'v' . $r->version . ' · ' . $r->created_at->format('d.m.Y')])
                    )
                    ->required()
                    ->live()
                    ->afterStateUpdated(function ($state, $set, $get) {
                        if (! $state) {
                            $set('origins', []);
                            return;
                        }
                        $recipe = Recipe::with('spices')->find($state);
                        if ($recipe) {
                            $existing = collect($get('origins') ?? [])->keyBy('spice_id');
                            $set('origins', $recipe->spices->map(fn ($s) => $existing->has($s->id)
                                ? $existing[$s->id]
                                : ['spice_id' => $s->id, 'entries' => [['supplier_id' => null, 'origin_country' => null, 'farmer_id' => 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'),
            ])->columns(2),

            Forms\Components\Section::make('Herkunft der Rohstoffe')->schema([
                Forms\Components\Repeater::make('origins')
                    ->label('')
                    ->relationship()
                    ->schema([
                        Forms\Components\Hidden::make('spice_id'),
                        Forms\Components\Placeholder::make('spice_name')
                            ->label('Rohstoff')
                            ->content(fn (Get $get): string =>
                                Spice::find($get('spice_id'))?->name ?? '—'
                            )
                            ->columnSpanFull(),

                        Forms\Components\Repeater::make('entries')
                            ->label('Herkunftsangaben')
                            ->relationship()
                            ->schema([
                                Forms\Components\Select::make('supplier_id')
                                    ->label('Lieferant')
                                    ->options(fn () => \App\Models\Supplier::orderBy('name')->pluck('name', 'id'))
                                    ->searchable()
                                    ->createOptionForm([
                                        Forms\Components\TextInput::make('name')->label('Name')->required(),
                                    ])
                                    ->createOptionUsing(fn ($data) => \App\Models\Supplier::create($data)->id)
                                    ->nullable(),

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

                                Forms\Components\Select::make('farmer_id')
                                    ->label('Landwirt')
                                    ->options(fn () => Farmer::orderBy('name')->pluck('name', 'id'))
                                    ->searchable()
                                    ->createOptionForm([
                                        Forms\Components\TextInput::make('name')->label('Name')->required(),
                                    ])
                                    ->createOptionUsing(fn ($data) => Farmer::create($data)->id)
                                    ->nullable(),

                                Forms\Components\Textarea::make('notes')
                                    ->label('Notizen')
                                    ->rows(2)
                                    ->columnSpanFull(),
                            ])
                            ->columns(3)
                            ->addActionLabel('Eintrag hinzufügen')
                            ->reorderable(false)
                            ->columnSpanFull(),
                    ])
                    ->reorderable(false),
            ]),
        ]);
    }

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

                Tables\Columns\TextColumn::make('product.title')
                    ->label('Produkt')
                    ->searchable(),

                Tables\Columns\TextColumn::make('recipe.name')
                    ->label('Rezeptur'),

                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')
            ->filters([
                Tables\Filters\SelectFilter::make('product')
                    ->relationship('product', 'title')
                    ->label('Produkt'),
            ])
            ->actions([
                Tables\Actions\EditAction::make(),
                Tables\Actions\DeleteAction::make(),
            ]);
    }

    public static function getPages(): array
    {
        return [
            'index'  => Pages\ListBatches::route('/'),
            'create' => Pages\CreateBatch::route('/create'),
            'edit'   => Pages\EditBatch::route('/{record}/edit'),
        ];
    }
}