<?php

namespace App\Modules\Stock;

use App\Contracts\SalesChannel;
use App\Contracts\StockProvider;
use App\Events\StockSyncFinished;
use App\Facades\Settings;
use App\Imports\AutoTraderApiToVehicleImport;
use App\Jobs\AutoTraderCSVExportJob;
use App\Services\AutoTraderApi;
use App\Services\AutoTraderHub;
use Carbon\Carbon;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\Log;
use Mtc\AutoTraderStock\Services\AutoTraderService;
use Mtc\MercuryDataModels\Dealership;
use Mtc\MercuryDataModels\SalesChannelHistory;
use Mtc\MercuryDataModels\Vehicle;

class AutoTraderStock implements StockProvider, SalesChannel
{
    use DispatchesJobs;

    private Collection $dealerships;
    private bool $fullSync;

    public function __construct(
        private readonly AutoTraderApiToVehicleImport $import,
        private readonly AutoTraderHub $export
    ) {
    }


    public function enabled(): bool
    {
        return (Settings::get('stock-auto-trader-enabled', false) ?? false)
            || (Settings::get('sales-channels-auto-trader-enabled', false) ?? false);
    }

    public function name(): string
    {
        return 'AutoTrader';
    }

    /**
     * Fields to add to dealership management
     *
     * @return array[]
     */
    public function dealershipAdditionalDataFields()
    {
        return [
            'auto-trader-location-id' => [
                'type' => 'text',
                'label' => 'Dealer ID within AutoTrader',
            ],
        ];
    }

    public function runScheduledImport(bool $fullSync = true): void
    {
        $this->fullSync = $fullSync;
        Vehicle::query()
            ->where('stock_provider', $this->import->getProviderName())
            ->update(['was_recently_synced' => 0]);

        $this->dealerships = $this->loadDealerships();
        $this->dealerships
            ->each(fn ($dealership, $dealership_id) => $this->syncDealershipData($dealership, $dealership_id));

        if (Settings::get('auto-trader-stock-remove-old-vehicles') && $this->fullSync) {
            Vehicle::query()
                ->where('stock_provider', $this->import->getProviderName())
                ->where('was_recently_synced', 0)
                ->delete();
        }
        Event::dispatch(new StockSyncFinished('auto-trader'));
    }

    public function getStockStatus(): array
    {
        $this->dealerships = $this->loadDealerships()->unique();
        $locationData = $this->dealerships
            ->keyBy(fn($did) => $did)
            ->map(fn($did) => $this->getStockFromLocation($did));

        $stock = Vehicle::query()->with('dealership')->withImageCount()->get()->keyBy('vrm_condensed');
        return [
            'locations' => $locationData->map(fn($data, $did) => [
                'location' => $did,
                'total' => $data->count(),
                'published' => $data
                    ->filter(fn($v) => $v['adverts']['retailAdverts']['autotraderAdvert']['status'] == 'PUBLISHED')
                    ->count(),
                'profile' => $data
                    ->filter(fn($v) => $v['adverts']['retailAdverts']['profileAdvert']['status'] == 'PUBLISHED')
                    ->count(),
                'deleted' => $data
                    ->filter(fn($v) => in_array($v['metadata']['lifecycleState'], ['WASTEBIN', 'DELETED']))
                    ->count(),
                'no_images' => $data
                    ->reject(fn($v) => in_array($v['metadata']['lifecycleState'], ['WASTEBIN', 'DELETED']))
                    ->filter(fn($v) => count($v['media']['images']) == 0)
                    ->count(),
            ]),
            'vehicles' => $locationData->flatten(1)
                ->filter()
                ->map(fn($vehicle) => [
                    'stock_id' => $vehicle['metadata']['stockId'],
                    'location' => $vehicle['advertiser']['advertiserId'],
                    'vrm' => $vehicle['vehicle']['registration'],
                    'dealership' => $stock[$vehicle['vehicle']['registration']]?->dealership?->name ?? null,
                    'id' => $stock[$vehicle['vehicle']['registration']]?->id ?? null,
                    'make' => $vehicle['vehicle']['make'],
                    'model' => $vehicle['vehicle']['model'],
                    'images' => count($vehicle['media']['images']),
                    'image_count' => $stock[$vehicle['vehicle']['registration']]?->image_count ?? null,
                    'status' => $vehicle['metadata']['lifecycleState'],
                    'published' => $vehicle['adverts']['retailAdverts']['autotraderAdvert']['status'],
                    'profile' => $vehicle['adverts']['retailAdverts']['profileAdvert']['status'],
                ]),
        ];
    }

    private function getStockFromLocation(string $did): Collection
    {
        $service = new AutoTraderService($did, App::make(AutoTraderApi::class));
        return $service->fetchVehicles();
    }

    private function syncDealershipData($dealership, $dealership_id)
    {
        $config = config('auto_trader_stock', []);
        $config['is_production'] = config('auto_trader_stock.use_sandbox') === false;

        $service = new AutoTraderService($dealership, App::make(AutoTraderApi::class));
        $vehicles = $service->fetchVehicles();

        $this->import->setDealershipId($dealership_id);

        $vehicles->filter(fn($vehicle_data) => $this->fullSync || $this->isRecentlyUpdated($vehicle_data))
            ->each(fn($vehicle_data) => $this->syncVehicle($vehicle_data, $service));
    }

    public function loadDealerships()
    {
        $this->dealerships = Dealership::all()
            ->each(function (Dealership $dealership) {
                $dealership->stock_location = $dealership->data['auto-trader-location-id'] ?? null;
            });

        return $this->dealerships
            ->keyBy(fn(Dealership $dealership) => $dealership->id)
            ->map(fn(Dealership $dealership) => $dealership->data['auto-trader-location-id'] ?? null)
            ->filter();
    }

    public function runScheduledExport(): void
    {

        if (Settings::get('sales-channels-auto-trader-method') === 'ftp') {
            $this->dispatch(new AutoTraderCSVExportJob());
        } else {
            $this->exportViaApi();
            $this->syncVehicleAutoTraderId();
        }
    }

    private function syncVehicle(array $vehicle_data, AutoTraderService $service): void
    {
        if (!empty($vehicle_data['vehicle']['derivativeId']) && !$this->import->isVehicleDeleted($vehicle_data)) {
            $vehicle_data['enriched_data'] = $service->fetchAdditional($vehicle_data);
        }
        if ($this->import->exists($vehicle_data) === false) {
            $this->import->add($vehicle_data);
        } else {
            $this->import->update($vehicle_data);
        }
    }

    private function exportViaApi(): void
    {
        try {
            $this->export->setToken(Settings::get('auto-trader-hub-token'));
            $reference = $this->export->initExport();

            $includeDeleted = Settings::get('auto-trader-upsert-send-deleted');
            $maxAgeDays = (int)Settings::get('auto-trader-upsert-deleted-max-age-days');

            $query = Vehicle::query()
                ->with([
                    'dealership',
                    'make',
                    'model',
                    'fuelType',
                    'drivetrain',
                    'transmission',
                    'bodyStyle',
                    'mediaUses.media',
                    'features',
                    'specs',
                ])
                ->whereNotNull('registration_number');

            $recordsExported = $query->count();
            $query->chunk(100, fn(Collection $batch) => $this->export->bulkExport($reference, $batch));
            if ($includeDeleted && $maxAgeDays > 0) {
                $removed = Vehicle::onlyTrashed()
                    ->with([
                        'dealership',
                        'make',
                        'model',
                        'fuelType',
                        'drivetrain',
                        'transmission',
                        'bodyStyle',
                        'mediaUses.media',
                        'features',
                        'specs',
                    ])
                    ->whereNotNull('registration_number')
                    ->where('deleted_at', '>=', now()->subDays($maxAgeDays))
                    ->get();

                // Check if vehicles are still live with this vrm
                $same_vrm_exists = Vehicle::query()
                    ->whereIn('vrm_condensed', $removed->pluck('vrm_condensed'))
                    ->pluck('vrm_condensed');

                // Ones live need to be removed from the sync
                $removed = $removed
                    ->reject(fn(Vehicle $vehicle) => $same_vrm_exists->contains($vehicle->vrm_condensed));

                $removed->chunk(50)->each(fn($chunk) => $this->export->bulkExport($reference, $chunk));
                $recordsExported += $removed->count();
            }

            SalesChannelHistory::store('auto-trader-sales', true, $recordsExported . ' records exported');
        } catch (\Exception $exception) {
            SalesChannelHistory::store('auto-trader-sales', false, $exception->getMessage());
            Log::error('AutoTrader stock export failed with error:', [
                'tenant' => tenant('id'),
                'message' => $exception->getMessage(),
            ]);
        }
    }

    private function isRecentlyUpdated(array $vehicle_data): bool
    {
        try {
            return Carbon::parse($vehicle_data['metadata']['lastUpdatedByAdvertiser'])
                ->greaterThanOrEqualTo(Carbon::now()->subHours(24));
        } catch (\Exception $exception) {
            // issue parsing updated timestamp
        }
        return true;
    }

    public function setAdvertFields(bool $isPublished): array
    {
        return [
            'autotraderAdvert' => $isPublished ? 'PUBLISHED' : 'NOT_PUBLISHED',
            'profileAdvert' => $isPublished ? 'PUBLISHED' : 'NOT_PUBLISHED',
        ];
    }

    private function syncVehicleAutoTraderId(): void
    {
        $this->dealerships = $this->loadDealerships()->unique();
        $this->dealerships
            ->keyBy(fn($did) => $did)
            ->map(fn($did) => $this->getStockFromLocation($did))
            ->each(fn($locationData) => $locationData
                ->reject(fn($vehicle) => in_array($vehicle['metadata']['lifecycleState'], ['WASTEBIN', 'DELETED']))
                ->each(fn($vehicle) => $this->sanityCheckVehicleAuToTraderId($vehicle)));
    }

    private function sanityCheckVehicleAuToTraderId($vehicle): void
    {
        $exists = Vehicle::query()
            ->where('auto_trader_id', $vehicle['metadata']['stockId'])
            ->where('vrm_condensed', $vehicle['vehicle']['registration'])
            ->exists();

        if ($exists) {
            return;
        }

        Vehicle::query()
            ->where('vrm_condensed', $vehicle['vehicle']['registration'])
            ->update([
                'auto_trader_id' => $vehicle['metadata']['stockId']
            ]);
    }
}
