<?php

namespace App\Filament\Resources;

use App\Filament\Resources\PolicyVersionResource\Pages;
use App\Jobs\BulkPolicyVersionForceDeleteJob;
use App\Jobs\BulkPolicyVersionPruneJob;
use App\Jobs\BulkPolicyVersionRestoreJob;
use App\Models\PolicyVersion;
use App\Models\Tenant;
use App\Services\BulkOperationService;
use App\Services\Intune\AuditLogger;
use App\Services\Intune\PolicyNormalizer;
use App\Services\Intune\VersionDiff;
use BackedEnum;
use Filament\Actions;
use Filament\Actions\BulkAction;
use Filament\Actions\BulkActionGroup;
use Filament\Forms;
use Filament\Infolists;
use Filament\Notifications\Notification;
use Filament\Resources\Resource;
use Filament\Schemas\Components\Tabs;
use Filament\Schemas\Components\Tabs\Tab;
use Filament\Schemas\Schema;
use Filament\Tables;
use Filament\Tables\Contracts\HasTable;
use Filament\Tables\Filters\TrashedFilter;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Collection;
use UnitEnum;

class PolicyVersionResource extends Resource
{
    protected static ?string $model = PolicyVersion::class;

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-list-bullet';

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

    public static function infolist(Schema $schema): Schema
    {
        return $schema
            ->schema([
                Infolists\Components\TextEntry::make('policy.display_name')->label('Policy'),
                Infolists\Components\TextEntry::make('version_number')->label('Version'),
                Infolists\Components\TextEntry::make('policy_type'),
                Infolists\Components\TextEntry::make('platform'),
                Infolists\Components\TextEntry::make('created_by')->label('Actor'),
                Infolists\Components\TextEntry::make('captured_at')->dateTime(),
                Tabs::make()
                    ->activeTab(1)
                    ->persistTabInQueryString('tab')
                    ->columnSpanFull()
                    ->tabs([
                        Tab::make('Normalized settings')
                            ->schema([
                                Infolists\Components\ViewEntry::make('normalized_settings')
                                    ->view('filament.infolists.entries.normalized-settings')
                                    ->state(function (PolicyVersion $record) {
                                        $normalized = app(PolicyNormalizer::class)->normalize(
                                            is_array($record->snapshot) ? $record->snapshot : [],
                                            $record->policy_type ?? '',
                                            $record->platform
                                        );

                                        $normalized['context'] = 'version';
                                        $normalized['record_id'] = (string) $record->getKey();

                                        return $normalized;
                                    }),
                            ]),
                        Tab::make('Raw JSON')
                            ->schema([
                                Infolists\Components\ViewEntry::make('snapshot_pretty')
                                    ->view('filament.infolists.entries.snapshot-json')
                                    ->state(fn (PolicyVersion $record) => $record->snapshot ?? []),
                            ]),
                        Tab::make('Diff')
                            ->schema([
                                Infolists\Components\ViewEntry::make('normalized_diff')
                                    ->view('filament.infolists.entries.normalized-diff')
                                    ->state(function (PolicyVersion $record) {
                                        $normalizer = app(PolicyNormalizer::class);
                                        $diff = app(VersionDiff::class);

                                        $previous = $record->previous();
                                        $from = $previous
                                            ? $normalizer->flattenForDiff($previous->snapshot ?? [], $previous->policy_type ?? '', $previous->platform)
                                            : [];
                                        $to = $normalizer->flattenForDiff($record->snapshot ?? [], $record->policy_type ?? '', $record->platform);

                                        return $diff->compare($from, $to);
                                    }),
                                Infolists\Components\TextEntry::make('diff')
                                    ->label('Diff JSON vs previous')
                                    ->state(function (PolicyVersion $record) {
                                        $previous = $record->previous();

                                        if (! $previous) {
                                            return ['summary' => 'No previous version'];
                                        }

                                        return app(VersionDiff::class)
                                            ->compare($previous->snapshot ?? [], $record->snapshot ?? []);
                                    })
                                    ->formatStateUsing(fn ($state) => json_encode($state ?? [], JSON_PRETTY_PRINT))
                                    ->copyable(),
                            ]),
                    ]),
            ]);
    }

    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('policy.display_name')->label('Policy')->sortable()->searchable(),
                Tables\Columns\TextColumn::make('version_number')->sortable(),
                Tables\Columns\TextColumn::make('policy_type')->badge(),
                Tables\Columns\TextColumn::make('platform')->badge(),
                Tables\Columns\TextColumn::make('created_by')->label('Actor'),
                Tables\Columns\TextColumn::make('captured_at')->dateTime()->sortable(),
            ])
            ->filters([
                TrashedFilter::make()
                    ->label('Archived')
                    ->placeholder('Active')
                    ->trueLabel('All')
                    ->falseLabel('Archived'),
            ])
            ->actions([
                Actions\ViewAction::make()
                    ->url(fn (PolicyVersion $record) => static::getUrl('view', ['record' => $record]))
                    ->openUrlInNewTab(false),
                Actions\ActionGroup::make([
                    Actions\Action::make('archive')
                        ->label('Archive')
                        ->color('danger')
                        ->icon('heroicon-o-archive-box-x-mark')
                        ->requiresConfirmation()
                        ->visible(fn (PolicyVersion $record) => ! $record->trashed())
                        ->action(function (PolicyVersion $record, AuditLogger $auditLogger) {
                            $record->delete();

                            if ($record->tenant) {
                                $auditLogger->log(
                                    tenant: $record->tenant,
                                    action: 'policy_version.deleted',
                                    resourceType: 'policy_version',
                                    resourceId: (string) $record->id,
                                    status: 'success',
                                    context: ['metadata' => ['policy_id' => $record->policy_id, 'version' => $record->version_number]]
                                );
                            }

                            Notification::make()
                                ->title('Policy version archived')
                                ->success()
                                ->send();
                        }),
                    Actions\Action::make('forceDelete')
                        ->label('Force delete')
                        ->color('danger')
                        ->icon('heroicon-o-trash')
                        ->requiresConfirmation()
                        ->visible(fn (PolicyVersion $record) => $record->trashed())
                        ->action(function (PolicyVersion $record, AuditLogger $auditLogger) {
                            if ($record->tenant) {
                                $auditLogger->log(
                                    tenant: $record->tenant,
                                    action: 'policy_version.force_deleted',
                                    resourceType: 'policy_version',
                                    resourceId: (string) $record->id,
                                    status: 'success',
                                    context: ['metadata' => ['policy_id' => $record->policy_id, 'version' => $record->version_number]]
                                );
                            }

                            $record->forceDelete();

                            Notification::make()
                                ->title('Policy version permanently deleted')
                                ->success()
                                ->send();
                        }),

                    Actions\Action::make('restore')
                        ->label('Restore')
                        ->color('success')
                        ->icon('heroicon-o-arrow-uturn-left')
                        ->requiresConfirmation()
                        ->visible(fn (PolicyVersion $record) => $record->trashed())
                        ->action(function (PolicyVersion $record, AuditLogger $auditLogger) {
                            $record->restore();

                            if ($record->tenant) {
                                $auditLogger->log(
                                    tenant: $record->tenant,
                                    action: 'policy_version.restored',
                                    resourceType: 'policy_version',
                                    resourceId: (string) $record->id,
                                    status: 'success',
                                    context: ['metadata' => ['policy_id' => $record->policy_id, 'version' => $record->version_number]]
                                );
                            }

                            Notification::make()
                                ->title('Policy version restored')
                                ->success()
                                ->send();
                        }),
                ])->icon('heroicon-o-ellipsis-vertical'),
            ])
            ->bulkActions([
                BulkActionGroup::make([
                    BulkAction::make('bulk_prune_versions')
                        ->label('Prune Versions')
                        ->icon('heroicon-o-trash')
                        ->color('danger')
                        ->requiresConfirmation()
                        ->modalDescription('Only versions captured more than the specified retention window (in days) are eligible. Newer versions will be skipped.')
                        ->hidden(function (HasTable $livewire): bool {
                            $trashedFilterState = $livewire->getTableFilterState(TrashedFilter::class) ?? [];
                            $value = $trashedFilterState['value'] ?? null;

                            $isOnlyTrashed = in_array($value, [0, '0', false], true);

                            return $isOnlyTrashed;
                        })
                        ->form(function (Collection $records) {
                            $fields = [
                                Forms\Components\TextInput::make('retention_days')
                                    ->label('Retention Days')
                                    ->helperText('Versions captured within the last N days will be skipped.')
                                    ->numeric()
                                    ->required()
                                    ->default(90)
                                    ->minValue(1),
                            ];

                            if ($records->count() >= 20) {
                                $fields[] = Forms\Components\TextInput::make('confirmation')
                                    ->label('Type DELETE to confirm')
                                    ->required()
                                    ->in(['DELETE'])
                                    ->validationMessages([
                                        'in' => 'Please type DELETE to confirm.',
                                    ]);
                            }

                            return $fields;
                        })
                        ->action(function (Collection $records, array $data) {
                            $tenant = Tenant::current();
                            $user = auth()->user();
                            $count = $records->count();
                            $ids = $records->pluck('id')->toArray();

                            $retentionDays = (int) ($data['retention_days'] ?? 90);

                            $service = app(BulkOperationService::class);
                            $run = $service->createRun($tenant, $user, 'policy_version', 'prune', $ids, $count);

                            if ($count >= 20) {
                                Notification::make()
                                    ->title('Bulk prune started')
                                    ->body("Pruning {$count} policy versions in the background. Check the progress bar in the bottom right corner.")
                                    ->icon('heroicon-o-arrow-path')
                                    ->iconColor('warning')
                                    ->info()
                                    ->duration(8000)
                                    ->sendToDatabase($user)
                                    ->send();

                                BulkPolicyVersionPruneJob::dispatch($run->id, $retentionDays);
                            } else {
                                BulkPolicyVersionPruneJob::dispatchSync($run->id, $retentionDays);
                            }
                        })
                        ->deselectRecordsAfterCompletion(),

                    BulkAction::make('bulk_restore_versions')
                        ->label('Restore Versions')
                        ->icon('heroicon-o-arrow-uturn-left')
                        ->color('success')
                        ->requiresConfirmation()
                        ->hidden(function (HasTable $livewire): bool {
                            $trashedFilterState = $livewire->getTableFilterState(TrashedFilter::class) ?? [];
                            $value = $trashedFilterState['value'] ?? null;

                            $isOnlyTrashed = in_array($value, [0, '0', false], true);

                            return ! $isOnlyTrashed;
                        })
                        ->modalHeading(fn (Collection $records) => "Restore {$records->count()} policy versions?")
                        ->modalDescription('Archived versions will be restored back to the active list. Active versions will be skipped.')
                        ->action(function (Collection $records) {
                            $tenant = Tenant::current();
                            $user = auth()->user();
                            $count = $records->count();
                            $ids = $records->pluck('id')->toArray();

                            $service = app(BulkOperationService::class);
                            $run = $service->createRun($tenant, $user, 'policy_version', 'restore', $ids, $count);

                            if ($count >= 20) {
                                Notification::make()
                                    ->title('Bulk restore started')
                                    ->body("Restoring {$count} policy versions in the background. Check the progress bar in the bottom right corner.")
                                    ->icon('heroicon-o-arrow-path')
                                    ->iconColor('warning')
                                    ->info()
                                    ->duration(8000)
                                    ->sendToDatabase($user)
                                    ->send();

                                BulkPolicyVersionRestoreJob::dispatch($run->id);
                            } else {
                                BulkPolicyVersionRestoreJob::dispatchSync($run->id);
                            }
                        })
                        ->deselectRecordsAfterCompletion(),

                    BulkAction::make('bulk_force_delete_versions')
                        ->label('Force Delete Versions')
                        ->icon('heroicon-o-trash')
                        ->color('danger')
                        ->requiresConfirmation()
                        ->hidden(function (HasTable $livewire): bool {
                            $trashedFilterState = $livewire->getTableFilterState(TrashedFilter::class) ?? [];
                            $value = $trashedFilterState['value'] ?? null;

                            $isOnlyTrashed = in_array($value, [0, '0', false], true);

                            return ! $isOnlyTrashed;
                        })
                        ->modalHeading(fn (Collection $records) => "Force delete {$records->count()} policy versions?")
                        ->modalDescription('This is permanent. Only archived versions will be permanently deleted; active versions will be skipped.')
                        ->form([
                            Forms\Components\TextInput::make('confirmation')
                                ->label('Type DELETE to confirm')
                                ->required()
                                ->in(['DELETE'])
                                ->validationMessages([
                                    'in' => 'Please type DELETE to confirm.',
                                ]),
                        ])
                        ->action(function (Collection $records, array $data) {
                            $tenant = Tenant::current();
                            $user = auth()->user();
                            $count = $records->count();
                            $ids = $records->pluck('id')->toArray();

                            $service = app(BulkOperationService::class);
                            $run = $service->createRun($tenant, $user, 'policy_version', 'force_delete', $ids, $count);

                            if ($count >= 20) {
                                Notification::make()
                                    ->title('Bulk force delete started')
                                    ->body("Force deleting {$count} policy versions in the background. Check the progress bar in the bottom right corner.")
                                    ->icon('heroicon-o-arrow-path')
                                    ->iconColor('warning')
                                    ->info()
                                    ->duration(8000)
                                    ->sendToDatabase($user)
                                    ->send();

                                BulkPolicyVersionForceDeleteJob::dispatch($run->id);
                            } else {
                                BulkPolicyVersionForceDeleteJob::dispatchSync($run->id);
                            }
                        })
                        ->deselectRecordsAfterCompletion(),
                ]),
            ]);
    }

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

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

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