<?php

declare(strict_types=1);

namespace App\Filament\Resources\Media;

use App\Filament\Resources\Media\Pages\ListMedia;
use App\Jobs\ProcessMedia;
use App\Models\Media;
use BackedEnum;
use Filament\Actions\Action;
use Filament\Actions\DeleteAction;
use Filament\Notifications\Notification;
use Filament\Resources\Resource;
use Filament\Support\Icons\Heroicon;
use Filament\Tables\Columns\ImageColumn;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Filters\Filter;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;
use UnitEnum;

/**
 * Everything that has been uploaded, and what is known about it.
 *
 * Nothing here is authored: the rows are derived from the files, so this is a
 * place to look rather than to write. What it answers is the set of questions
 * nowhere else could — what is taking up the disk, which images never got
 * processed, and which files nothing points at any more.
 */
class MediaResource extends Resource
{
    protected static ?string $model = Media::class;

    protected static string|BackedEnum|null $navigationIcon = Heroicon::OutlinedPhoto;

    protected static ?int $navigationSort = 86;

    public static function getModelLabel(): string
    {
        return __('panel.media.label');
    }

    public static function getPluralModelLabel(): string
    {
        return __('panel.media.plural');
    }

    public static function getNavigationGroup(): string|UnitEnum|null
    {
        return __('panel.groups.administration');
    }

    public static function getRecordTitle(?Model $record): ?string
    {
        return $record?->path;
    }

    public static function canCreate(): bool
    {
        // Files arrive by being uploaded on a record, not from here.
        return false;
    }

    public static function table(Table $table): Table
    {
        return $table
            ->defaultSort('created_at', 'desc')
            ->columns([
                ImageColumn::make('path')
                    ->label('')
                    ->disk(fn (Media $record) => $record->disk)
                    ->height(48),

                TextColumn::make('path')
                    ->label(__('panel.media.fields.file'))
                    ->fontFamily('mono')
                    ->size('xs')
                    ->wrap()
                    ->searchable()
                    ->description(fn (Media $record) => $record->mime),

                TextColumn::make('width')
                    ->label(__('panel.media.fields.size'))
                    ->state(fn (Media $record) => $record->width
                        ? "{$record->width}×{$record->height}"
                        : __('panel.media.pending'))
                    ->badge()
                    ->color(fn (Media $record) => $record->width ? 'gray' : 'warning'),

                TextColumn::make('variants')
                    ->label(__('panel.media.fields.versions'))
                    ->state(fn (Media $record) => count($record->variants ?? []))
                    ->badge()
                    ->color(fn (int $state) => $state > 0 ? 'success' : 'gray'),

                // Original plus every derived version: the number that
                // explains where the disk went.
                TextColumn::make('size')
                    ->label(__('panel.media.fields.weight'))
                    ->state(fn (Media $record) => round($record->totalSize() / 1024).' KB')
                    ->sortable(),

                TextColumn::make('used')
                    ->label(__('panel.media.fields.used'))
                    ->state(fn (Media $record) => $record->isReferenced()
                        ? __('panel.media.in_use')
                        : __('panel.media.orphan'))
                    ->badge()
                    ->color(fn (Media $record) => $record->isReferenced() ? 'success' : 'warning'),

                TextColumn::make('error')
                    ->label(__('panel.media.fields.error'))
                    ->wrap()
                    ->color('danger')
                    ->placeholder('—')
                    ->toggleable(isToggledHiddenByDefault: true),
            ])
            ->filters([
                Filter::make('pending')
                    ->label(__('panel.media.filters.pending'))
                    ->query(fn (Builder $query) => $query->pending()),

                Filter::make('failed')
                    ->label(__('panel.media.filters.failed'))
                    ->query(fn (Builder $query) => $query->whereNotNull('error')),

                // Everything the prune command would take away.
                Filter::make('orphans')
                    ->label(__('panel.media.filters.orphans'))
                    ->query(fn (Builder $query) => $query
                        ->whereNotIn('path', Media::referencedPaths())),

                Filter::make('missing')
                    ->label(__('panel.media.filters.missing'))
                    ->query(fn (Builder $query) => $query
                        ->whereIn('id', Media::query()->get()
                            ->reject(fn (Media $m) => $m->exists())
                            ->pluck('id'))),
            ])
            ->recordActions([
                Action::make('open')
                    ->label(__('panel.media.actions.open'))
                    ->icon('heroicon-o-arrow-top-right-on-square')
                    ->url(fn (Media $record) => $record->url())
                    ->openUrlInNewTab(),

                Action::make('reprocess')
                    ->label(__('panel.media.actions.reprocess'))
                    ->icon('heroicon-o-arrow-path')
                    ->color('gray')
                    ->action(function (Media $record): void {
                        ProcessMedia::dispatch($record);

                        Notification::make()
                            ->title(__('panel.media.actions.reprocess_queued'))
                            ->success()
                            ->send();
                    }),

                // Only offered for files nothing points at: deleting one in
                // use would put a broken image on the public site.
                DeleteAction::make()
                    ->visible(fn (Media $record) => ! $record->isReferenced())
                    ->before(function (Media $record): void {
                        $record->deleteDerived();
                        Storage::disk($record->disk)->delete($record->path);
                    }),
            ])
            ->emptyStateHeading(__('panel.media.empty.heading'))
            ->emptyStateDescription(__('panel.media.empty.description'))
            ->emptyStateIcon('heroicon-o-photo');
    }

    /**
     * @return array<int, string>
     */
    public static function getGloballySearchableAttributes(): array
    {
        return ['path'];
    }

    public static function getPages(): array
    {
        return [
            'index' => ListMedia::route('/'),
        ];
    }

    public static function getNavigationBadge(): ?string
    {
        $pending = static::getModel()::query()->pending()->count();

        return $pending > 0 ? (string) $pending : null;
    }

    public static function getNavigationBadgeColor(): ?string
    {
        return 'warning';
    }
}