<?php

namespace App\Filament\Resources\EmotionResource\Pages;

use App\Filament\Resources\EmotionResource;
use App\Models\Emotion;
use Filament\Forms\Components\FileUpload;
use Filament\Forms\Form;
use Filament\Notifications\Notification;
use Filament\Resources\Pages\Page;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class ImportEmotions extends Page
{
    protected static string $resource = EmotionResource::class;
    protected string $view = 'filament.resources.emotion-resource.pages.import-emotions';
    protected ?string $heading = 'Import Emotions (CSV)';

    public ?string $file = null;

    public function form(Form $form): Form
    {
        return $form->schema([
            FileUpload::make('file')
                ->label('CSV file')
                ->acceptedFileTypes(['text/csv', 'text/plain'])
                ->directory('imports')
                ->required(),
        ]);
    }

    public function doImport(): void
    {
        $this->validate();

        $path = $this->form->getState()['file'] ?? null;
        if (!$path || !Storage::disk('public')->exists($path)) {
            Notification::make()->danger()->title('File not found')->send();
            return;
        }

        $fullPath = Storage::disk('public')->path($path);
        [$ok, $fail] = $this->importEmotionsCsv($fullPath);

        Notification::make()
            ->success()
            ->title("Imported {$ok} rows")
            ->body($fail ? "{$fail} failed" : null)
            ->send();
    }

    private function importEmotionsCsv(string $file): array
    {
        $handle = fopen($file, 'r');
        if (!$handle) {
            return [0, 0];
        }

        $ok = 0;
        $fail = 0;
        $headers = fgetcsv($handle, 0, ',');
        if (!$headers) {
            return [0, 0];
        }

        $map = array_flip($headers);

        while (($row = fgetcsv($handle, 0, ',')) !== false) {
            try {
                DB::transaction(function () use ($row, $map, &$ok) {
                    $nameDe = trim($row[$map['name_de']] ?? '');
                    $nameEn = trim($row[$map['name_en']] ?? '');

                    if (empty($nameDe) && empty($nameEn)) {
                        throw new \Exception('Name is required.');
                    }

                    $emotion = Emotion::create([
                        'name' => ['de' => $nameDe, 'en' => $nameEn],
                        'icon' => $row[$map['icon']] ?? null,
                        'color' => $row[$map['color']] ?? null,
                        'description' => [
                            'de' => $row[$map['description_de']] ?? null,
                            'en' => $row[$map['description_en']] ?? null,
                        ],
                        'sort_order' => (int)($row[$map['sort_order']] ?? 0),
                        'is_active' => (int)($row[$map['is_active']] ?? 1) ? 1 : 0,
                    ]);

                    $eventTypes = $row[$map['event_types']] ?? '';
                    if ($eventTypes) {
                        $slugs = array_filter(array_map('trim', explode('|', $eventTypes)));
                        if ($slugs) {
                            $eventTypeIds = DB::table('event_types')->whereIn('slug', $slugs)->pluck('id')->all();
                            $emotion->eventTypes()->attach($eventTypeIds);
                        }
                    }
                    $ok++;
                });
            } catch (\Throwable $e) {
                $fail++;
            }
        }

        fclose($handle);
        return [$ok, $fail];
    }
}