<?php

namespace App\Filament\Resources;

use App\Filament\Resources\PolicyResource\Pages;
use App\Filament\Resources\PolicyResource\RelationManagers\VersionsRelationManager;
use App\Models\Policy;
use App\Models\Tenant;
use App\Services\Intune\PolicyNormalizer;
use BackedEnum;
use Filament\Actions;
use Filament\Infolists;
use Filament\Resources\Resource;
use Filament\Schemas\Schema;
use Filament\Tables;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use UnitEnum;

class PolicyResource extends Resource
{
    protected static ?string $model = Policy::class;

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-shield-check';

    protected static string|UnitEnum|null $navigationGroup = 'Inventory';

    public static function form(Schema $schema): Schema
    {
        return $schema;
    }

    public static function infolist(Schema $schema): Schema
    {
        return $schema
            ->schema([
                Infolists\Components\TextEntry::make('display_name')->label('Policy'),
                Infolists\Components\TextEntry::make('policy_type')->label('Type'),
                Infolists\Components\TextEntry::make('platform'),
                Infolists\Components\TextEntry::make('external_id')->label('External ID'),
                Infolists\Components\TextEntry::make('last_synced_at')->dateTime()->label('Last synced'),
                Infolists\Components\TextEntry::make('created_at')->since(),
                Infolists\Components\ViewEntry::make('settings')
                    ->label('Settings')
                    ->view('filament.infolists.entries.normalized-settings')
                    ->state(function (Policy $record) {
                        $snapshot = $record->versions()
                            ->orderByDesc('captured_at')
                            ->value('snapshot');

                        return app(PolicyNormalizer::class)->normalize(
                            is_array($snapshot) ? $snapshot : [],
                            $record->policy_type ?? '',
                            $record->platform
                        );
                    }),
            ]);
    }

    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('display_name')
                    ->label('Policy')
                    ->searchable(),
                Tables\Columns\TextColumn::make('policy_type')
                    ->label('Type')
                    ->badge()
                    ->formatStateUsing(fn (?string $state, Policy $record) => static::typeMeta($record->policy_type)['label'] ?? $state),
                Tables\Columns\TextColumn::make('category')
                    ->label('Category')
                    ->badge()
                    ->state(fn (Policy $record) => static::typeMeta($record->policy_type)['category'] ?? 'Unknown'),
                Tables\Columns\TextColumn::make('restore_mode')
                    ->label('Restore')
                    ->badge()
                    ->state(fn (Policy $record) => static::typeMeta($record->policy_type)['restore'] ?? 'enabled'),
                Tables\Columns\TextColumn::make('platform')
                    ->badge()
                    ->sortable(),
                Tables\Columns\TextColumn::make('versions_count')
                    ->label('Settings')
                    ->badge()
                    ->state(fn (Policy $record) => $record->versions_count > 0 ? 'Available' : 'Missing')
                    ->color(fn (Policy $record) => $record->versions_count > 0 ? 'success' : 'gray'),
                Tables\Columns\TextColumn::make('external_id')
                    ->label('External ID')
                    ->copyable()
                    ->limit(32),
                Tables\Columns\TextColumn::make('last_synced_at')
                    ->label('Last synced')
                    ->dateTime()
                    ->sortable(),
                Tables\Columns\TextColumn::make('created_at')
                    ->dateTime()
                    ->since()
                    ->toggleable(isToggledHiddenByDefault: true),
            ])
            ->filters([
                Tables\Filters\SelectFilter::make('policy_type')
                    ->options(fn () => Policy::query()->distinct()->pluck('policy_type', 'policy_type')->all()),
                Tables\Filters\SelectFilter::make('category')
                    ->options(function () {
                        return collect(config('tenantpilot.supported_policy_types', []))
                            ->pluck('category', 'category')
                            ->filter()
                            ->unique()
                            ->sort()
                            ->all();
                    })
                    ->query(function (Builder $query, array $data) {
                        $category = $data['value'] ?? null;
                        if (! $category) {
                            return;
                        }

                        $types = collect(config('tenantpilot.supported_policy_types', []))
                            ->where('category', $category)
                            ->pluck('type')
                            ->all();

                        $query->whereIn('policy_type', $types);
                    }),
                Tables\Filters\SelectFilter::make('platform')
                    ->options(fn () => Policy::query()->distinct()->pluck('platform', 'platform')->filter()->all()),
            ])
            ->actions([
                Actions\ViewAction::make(),
            ])
            ->bulkActions([]);
    }

    public static function getEloquentQuery(): Builder
    {
        $tenantId = Tenant::current()->getKey();

        return parent::getEloquentQuery()
            ->when($tenantId, fn (Builder $query) => $query->where('tenant_id', $tenantId))
            ->withCount('versions');
    }

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

    public static function getPages(): array
    {
        return [
            'index' => Pages\ListPolicies::route('/'),
            'view' => Pages\ViewPolicy::route('/{record}'),
        ];
    }

    /**
     * @return array{label:?string,category:?string,restore:?string,risk:?string}|array<string,string>|array<string,mixed>
     */
    private static function typeMeta(?string $type): array
    {
        if ($type === null) {
            return [];
        }

        return collect(config('tenantpilot.supported_policy_types', []))
            ->firstWhere('type', $type) ?? [];
    }
}