<?php

namespace App\Filament\User\Resources;

use App\Filament\User\Resources\ProductResource\Pages;
use App\Filament\User\Resources\ProductResource\RelationManagers;
use App\Models\Product;
use Filament\Forms;
use Filament\Forms\Form;
use Filament\Forms\Components\FileUpload;
use Filament\Forms\Components\Placeholder;
use Filament\Forms\Components\Repeater;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\TextInput;
use Filament\Forms\Get;
use Filament\Resources\Resource;
use Filament\Tables;
use Filament\Tables\Table;
use Illuminate\Support\HtmlString;
use App\Models\Packing;
use App\Models\Recipe;
use App\Models\Spice;
use App\Rules\SumEquals100;
use Picqer\Barcode\BarcodeGeneratorSVG;

class ProductResource extends Resource {
    protected static ?string $model = Product::class;

    protected static ?string $navigationIcon = 'heroicon-o-inbox';
    protected static ?string $navigationLabel = 'Produkte';
    protected static ?string $modelLabel = 'Produkt';
    protected static ?string $slug = 'produkt';
    protected static ?string $navigationGroup = 'Produkte';
    protected static ?int $navigationSort = 1;

    public static function form(Form $form): Form {
        return $form
            ->schema([
                Forms\Components\TextInput::make('title')
                    ->label('Name')
                    ->required(),
                FileUpload::make('images')
                    ->label('Bilder')
                    ->multiple()
                    ->image()
                    ->maxFiles(15)
                    ->directory('product-images')
                    ->panelLayout('grid')
                    ->imagePreviewHeight('200')
                    ->columnSpanFull(),
                Placeholder::make('description')
                    ->label('Beschreibung')
                    ->content(fn ($record) => $record?->description ?? '—')
                    ->columnSpanFull(),
                Forms\Components\Section::make('Rezept')
                    ->schema([
                        Placeholder::make('recipe_version')
                            ->label('Version')
                            ->content(fn ($record) => $record?->recipe
                                ? 'v' . $record->recipe->version . ' · ' . $record->recipe->created_at->format('d.m.Y')
                                : '—'),
                        Repeater::make('recipe_spices')
                            ->label('Zutaten')
                            ->schema([
                                Select::make('spice_id')
                                    ->label('Rohstoff')
                                    ->options(Spice::all()->pluck('name', 'id'))
                                    ->searchable()
                                    ->required(),
                                TextInput::make('amount_in_percent')
                                    ->label('Anteil (%)')
                                    ->numeric()
                                    ->minValue(0.01)
                                    ->maxValue(100)
                                    ->required(),
                            ])
                            ->columns(2)
                            ->addActionLabel('Zutat hinzufügen')
                            ->dehydrated(false)
                            ->rules([new SumEquals100()])
                            ->afterStateHydrated(function ($component, $record) {
                                if ($record?->recipe) {
                                    $record->recipe->load('spices');
                                    $component->state(
                                        $record->recipe->spices->map(fn ($s) => [
                                            'spice_id'          => $s->id,
                                            'amount_in_percent' => $s->pivot->amount_in_percent,
                                        ])->toArray()
                                    );
                                }
                            }),
                    ])
                    ->columns(2)
                    ->columnSpanFull(),
                Repeater::make('sizes')
                    ->schema([
                        Select::make('packing_id')
                            ->label('Verpackung')
                            ->options(function () {
                                return Packing::all()->mapWithKeys(function ($packing) {
                                    return [$packing->id => $packing->name . ' (' . $packing->size . ')'];
                                });
                            })
                            ->searchable()
                            ->required(),
                        TextInput::make('price')
                            ->label('Preis (in EUR)')
                            ->numeric()
                            ->required(),
                        TextInput::make('sku')
                            ->label('SKU'),
                        Placeholder::make('barcode_preview')
                            ->label('Barcode')
                            ->content(function (Get $get): HtmlString {
                                $gtin = preg_replace('/\D/', '', (string) $get('gtin'));
                                if (strlen($gtin) < 8) {
                                    return new HtmlString('');
                                }
                                $type = match (strlen($gtin)) {
                                    8  => BarcodeGeneratorSVG::TYPE_EAN_8,
                                    13 => BarcodeGeneratorSVG::TYPE_EAN_13,
                                    12 => BarcodeGeneratorSVG::TYPE_UPC_A,
                                    14 => BarcodeGeneratorSVG::TYPE_CODABAR,
                                    default => BarcodeGeneratorSVG::TYPE_CODE_128,
                                };
                                try {
                                    $svg = (new BarcodeGeneratorSVG())->getBarcode($gtin, $type, 2, 60);
                                    return new HtmlString($svg);
                                } catch (\Throwable) {
                                    return new HtmlString('');
                                }
                            })
                            ->columnSpanFull()
                            ->visible(fn (Get $get) => strlen(preg_replace('/\D/', '', (string) $get('gtin'))) >= 8),
                        TextInput::make('gtin')
                            ->label('GTIN')
                            ->mask('9 999999 999999')
                            ->dehydrateStateUsing(fn ($state) => preg_replace('/\D/', '', (string) $state))
                            ->live(debounce: 500),
                    ])
                    ->label('Größen & Preise')
                    ->columns(2)
                    ->addActionLabel('Option hinzufügen')
                    ->afterStateHydrated(function ($state, $set, $record) {
                        if ($record) {
                            $record->load('sizes');

                            $sizesData = $record->sizes->map(function ($size) {
                                return [
                                    'packing_id'  => $size->id,
                                    'price'       => $size->pivot->price,
                                    'description' => $size->pivot->description,
                                    'sku'         => $size->pivot->sku,
                                    'gtin'        => $size->pivot->gtin,
                                ];
                            })->toArray();

                            $set('sizes', $sizesData);
                        }
                        return $state;
                    }),

            ]);
    }

    public static function table(Table $table): Table {
        return $table
            ->columns([
                Tables\Columns\ImageColumn::make('images')
                    ->label('Bild')
                    ->disk('public')
                    ->limit(1),
                Tables\Columns\TextColumn::make('title')
                    ->label('Name')
                    ->sortable()
                    ->searchable(),
                Tables\Columns\TextColumn::make('recipe.name')
                    ->label('Rezept'),
            ]);
    }

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

    public static function getPages(): array {
        return [
            'index'          => Pages\ListProducts::route('/'),
            'create'         => Pages\CreateProduct::route('/create'),
            'edit'           => Pages\EditProduct::route('/{record}/edit'),
            'recipe-history' => Pages\RecipeHistory::route('/{record}/rezept-versionen'),
        ];
    }

    public static function getPluralLabel(): string {
        return 'Produkte';
    }


    protected function mutateFormDataBeforeCreate(array $data): array {
        if (isset($data['images'])) {
            $data['images'] = json_encode($data['images']);
        }
        return $data;
    }

    protected function mutateFormDataBeforeUpdate(array $data): array {
        if (isset($data['images'])) {
            $data['images'] = json_encode($data['images']);
        }
        return $data;
    }

    public static function getRecord($id) {
        return Product::with('sizes')->findOrFail($id);  // Eager load spices relationship
    }

    public static function getTableRecordTitle() {
        return function ($record) {
            $images = json_decode($record->images, true);
            return implode(', ', $images);
        };
    }

    public static function getActions(): array {
        return [
            Actions\DeleteAction::make(),
            Action::make('deleteImage')
                ->action(function ($record, $data) {
                    $images = json_decode($record->images, true);
                    $index = array_search($data['image'], $images);
                    if ($index !== false) {
                        unset($images[$index]);
                        $record->update(['images' => array_values($images)]);
                    }
                })
                ->form([
                    Forms\Components\Select::make('image')
                        ->options(function ($record) {
                            return array_combine($record->images, $record->images);
                        })
                        ->required(),
                ]),
        ];
    }
}