<?php

declare(strict_types=1);

namespace App\Services\Adsense;

use App\Models\AdsenseConnection;
use App\Models\AdsenseDailyStat;
use App\Models\AdsenseEntity;
use App\Services\Adsense\Exceptions\AdsenseApiException;
use App\Services\Adsense\Exceptions\AdsenseAuthorizationException;
use App\Services\Adsense\Exceptions\AdsenseOAuthException;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Log;

final class AdsenseSyncService
{
    public function __construct(
        private readonly AdsenseApiClient $api,
        private readonly AdsenseReportParser $parser,
        private readonly AdsenseOAuthService $oauth,
    ) {}

    public function sync(
        AdsenseConnection $connection,
        Carbon $from,
        Carbon $to,
        bool $entitiesOnly = false,
    ): AdsenseSyncResult {
        $result = new AdsenseSyncResult(
            accountDisplayName: (string) ($connection->account_display_name ?: $connection->account_resource_name),
            from: $from->toDateString(),
            to: $to->toDateString(),
        );

        $connection->last_sync_attempt_at = now();
        $connection->save();

        try {
            $this->syncEntities($connection, $result);

            if (! $entitiesOnly) {
                $this->syncReports($connection, $from, $to, $result);
            }

            if ($result->reconnectRequired) {
                return $result;
            }

            $connection->last_successful_sync_at = now();
            $connection->status = $result->failedReports === []
                ? AdsenseConnection::STATUS_CONNECTED
                : AdsenseConnection::STATUS_ERROR;
            $connection->last_error = $result->failedReports === []
                ? null
                : 'Partial AdSense sync failure: '.implode(', ', $result->failedReports);
            $connection->save();
        } catch (AdsenseAuthorizationException $exception) {
            $result->reconnectRequired = true;
            $this->oauth->markReconnectRequired($connection, $exception->getMessage());
        } catch (AdsenseOAuthException $exception) {
            $result->failedReports[] = 'oauth';
            $connection->status = AdsenseConnection::STATUS_ERROR;
            $connection->last_error = $exception->getMessage();
            $connection->save();
        } catch (AdsenseApiException $exception) {
            $result->failedReports[] = 'entities';
            Log::warning('AdSense entity synchronization failed.', AdsenseLogSanitizer::context([
                'status' => $exception->status,
                'message' => $exception->getMessage(),
            ]));
            $connection->status = AdsenseConnection::STATUS_ERROR;
            $connection->last_error = $exception->getMessage();
            $connection->save();
        }

        return $result;
    }

    public function syncEntities(AdsenseConnection $connection, ?AdsenseSyncResult $result = null): AdsenseSyncResult
    {
        $result ??= new AdsenseSyncResult(
            accountDisplayName: (string) ($connection->account_display_name ?: $connection->account_resource_name),
        );

        $account = (string) $connection->account_resource_name;
        if ($account === '') {
            throw new AdsenseApiException('No AdSense account is selected.');
        }

        $adClients = $this->api->listAdClients($connection, $account);
        $now = now();
        $adUnits = 0;
        $customChannels = 0;

        foreach ($adClients as $client) {
            $clientName = (string) ($client['name'] ?? '');
            if ($clientName === '' || ! $this->supportsInventory($client)) {
                continue;
            }

            try {
                foreach ($this->api->listAdUnits($connection, $clientName) as $unit) {
                    $this->upsertEntity($account, $clientName, AdsenseEntity::TYPE_AD_UNIT, $unit, $now);
                    $adUnits++;
                }
            } catch (AdsenseAuthorizationException $exception) {
                throw $exception;
            } catch (AdsenseApiException $exception) {
                $this->logSkippedClient($clientName, 'ad_units', $exception);
            }

            try {
                foreach ($this->api->listCustomChannels($connection, $clientName) as $channel) {
                    $this->upsertEntity($account, $clientName, AdsenseEntity::TYPE_CUSTOM_CHANNEL, $channel, $now);
                    $customChannels++;
                }
            } catch (AdsenseAuthorizationException $exception) {
                throw $exception;
            } catch (AdsenseApiException $exception) {
                $this->logSkippedClient($clientName, 'custom_channels', $exception);
            }
        }

        $result->adUnits = $adUnits;
        $result->customChannels = $customChannels;
        $result->entitiesSynced = true;

        return $result;
    }

    private function syncReports(
        AdsenseConnection $connection,
        Carbon $from,
        Carbon $to,
        AdsenseSyncResult $result,
    ): void {
        $account = (string) $connection->account_resource_name;
        $metrics = array_values((array) config('adsense.metrics', []));

        $definitions = [
            AdsenseDailyStat::DIMENSION_TOTAL => ['DATE'],
            AdsenseDailyStat::DIMENSION_AD_UNIT => ['DATE', 'AD_UNIT_ID'],
            AdsenseDailyStat::DIMENSION_CUSTOM_CHANNEL => ['DATE', 'CUSTOM_CHANNEL_ID'],
            AdsenseDailyStat::DIMENSION_PLATFORM => ['DATE', 'PLATFORM_TYPE_CODE'],
            AdsenseDailyStat::DIMENSION_COUNTRY => ['DATE', 'COUNTRY_CODE'],
        ];

        foreach ($definitions as $dimensionType => $dimensions) {
            try {
                $report = $this->api->generateReport(
                    $connection,
                    $account,
                    $dimensions,
                    $metrics,
                    $from,
                    $to,
                    $dimensionType,
                );
                $rows = $this->parser->parse($report, $dimensionType, $account);
                $this->applyEntityLabels($rows, $account, $dimensionType);
                $saved = $this->upsertStats($rows);

                match ($dimensionType) {
                    AdsenseDailyStat::DIMENSION_TOTAL => $result->totalRows = $saved,
                    AdsenseDailyStat::DIMENSION_AD_UNIT => $result->adUnitRows = $saved,
                    AdsenseDailyStat::DIMENSION_CUSTOM_CHANNEL => $result->customChannelRows = $saved,
                    AdsenseDailyStat::DIMENSION_PLATFORM => $result->platformRows = $saved,
                    AdsenseDailyStat::DIMENSION_COUNTRY => $result->countryRows = $saved,
                    default => null,
                };
            } catch (AdsenseAuthorizationException $exception) {
                $result->reconnectRequired = true;
                throw $exception;
            } catch (AdsenseApiException $exception) {
                $result->failedReports[] = $dimensionType;
                Log::warning('AdSense report synchronization failed.', AdsenseLogSanitizer::context([
                    'report' => $dimensionType,
                    'status' => $exception->status,
                    'message' => $exception->getMessage(),
                ]));
            }
        }
    }

    /**
     * Website content ad clients (AFC / ca-pub-...) expose ad units.
     * YouTube host clients (ca-yt-host-pub-...) are listed by Google but 404 on adunits.
     *
     * @param  array<string, mixed>  $client
     */
    private function supportsInventory(array $client): bool
    {
        $name = strtolower((string) ($client['name'] ?? ''));
        $reportingId = strtolower((string) ($client['reportingDimensionId'] ?? ''));
        $haystack = $name.' '.$reportingId;

        foreach ((array) config('adsense.inventory_excluded_client_prefixes', ['ca-yt-host-']) as $prefix) {
            $prefix = strtolower(trim((string) $prefix));
            if ($prefix !== '' && str_contains($haystack, $prefix)) {
                return false;
            }
        }

        $product = strtoupper(trim((string) ($client['productCode'] ?? '')));
        $allowed = array_values(array_filter(array_map(
            static fn (mixed $code): string => strtoupper(trim((string) $code)),
            (array) config('adsense.inventory_product_codes', ['AFC']),
        )));

        if ($product !== '' && $allowed !== [] && ! in_array($product, $allowed, true)) {
            return false;
        }

        return true;
    }

    private function logSkippedClient(string $clientName, string $kind, AdsenseApiException $exception): void
    {
        Log::warning('AdSense skipped an ad client inventory request.', AdsenseLogSanitizer::context([
            'client' => $clientName,
            'kind' => $kind,
            'status' => $exception->status,
            'message' => $exception->getMessage(),
        ]));
    }

    /**
     * @param  array<string, mixed>  $entity
     */
    private function upsertEntity(
        string $account,
        string $adClient,
        string $type,
        array $entity,
        Carbon $seenAt,
    ): void {
        $resourceName = (string) ($entity['name'] ?? '');
        $reportingId = (string) ($entity['reportingDimensionId'] ?? '');
        if ($reportingId === '' && $resourceName !== '') {
            $reportingId = (string) str($resourceName)->afterLast('/');
        }
        if ($reportingId === '') {
            return;
        }

        $state = strtoupper((string) ($entity['state'] ?? ''));
        $active = $state === '' ? null : $state === 'ACTIVE' || $state === 'READY';

        AdsenseEntity::query()->updateOrCreate(
            [
                'account_resource_name' => $account,
                'type' => $type,
                'reporting_dimension_id' => $reportingId,
            ],
            [
                'ad_client_resource_name' => $adClient,
                'resource_name' => $resourceName !== '' ? $resourceName : null,
                'display_name' => (string) ($entity['displayName'] ?? $reportingId),
                'active' => $active,
                'last_seen_at' => $seenAt,
            ],
        );
    }

    /**
     * @param  list<array<string, mixed>>  $rows
     */
    private function applyEntityLabels(array &$rows, string $account, string $dimensionType): void
    {
        if (! in_array($dimensionType, [AdsenseDailyStat::DIMENSION_AD_UNIT, AdsenseDailyStat::DIMENSION_CUSTOM_CHANNEL], true)) {
            return;
        }

        $labels = AdsenseEntity::query()
            ->where('account_resource_name', $account)
            ->where('type', $dimensionType)
            ->pluck('display_name', 'reporting_dimension_id');

        foreach ($rows as &$row) {
            $key = (string) ($row['dimension_key'] ?? '');
            if ($key !== '' && isset($labels[$key]) && is_string($labels[$key]) && $labels[$key] !== '') {
                $row['dimension_label'] = $labels[$key];
            }
        }
        unset($row);
    }

    /**
     * @param  list<array<string, mixed>>  $rows
     */
    private function upsertStats(array $rows): int
    {
        if ($rows === []) {
            return 0;
        }

        $now = now();
        $payload = [];

        foreach ($rows as $row) {
            $payload[] = [
                'date' => $row['date'],
                'account_resource_name' => $row['account_resource_name'],
                'dimension_type' => $row['dimension_type'],
                'dimension_key' => $row['dimension_key'],
                'dimension_label' => $row['dimension_label'] ?? null,
                'currency_code' => $row['currency_code'] ?? null,
                'page_views' => $row['page_views'] ?? null,
                'ad_requests' => $row['ad_requests'] ?? null,
                'matched_ad_requests' => $row['matched_ad_requests'] ?? null,
                'impressions' => $row['impressions'] ?? null,
                'clicks' => $row['clicks'] ?? null,
                'estimated_earnings' => $row['estimated_earnings'] ?? null,
                'page_views_ctr' => $row['page_views_ctr'] ?? null,
                'page_views_rpm' => $row['page_views_rpm'] ?? null,
                'ad_requests_coverage' => $row['ad_requests_coverage'] ?? null,
                'ad_requests_ctr' => $row['ad_requests_ctr'] ?? null,
                'ad_requests_rpm' => $row['ad_requests_rpm'] ?? null,
                'impressions_ctr' => $row['impressions_ctr'] ?? null,
                'impressions_rpm' => $row['impressions_rpm'] ?? null,
                'cost_per_click' => $row['cost_per_click'] ?? null,
                'last_synced_at' => $now,
                'created_at' => $now,
                'updated_at' => $now,
            ];
        }

        foreach (array_chunk($payload, 200) as $chunk) {
            AdsenseDailyStat::query()->upsert(
                $chunk,
                ['account_resource_name', 'date', 'dimension_type', 'dimension_key'],
                [
                    'dimension_label',
                    'currency_code',
                    'page_views',
                    'ad_requests',
                    'matched_ad_requests',
                    'impressions',
                    'clicks',
                    'estimated_earnings',
                    'page_views_ctr',
                    'page_views_rpm',
                    'ad_requests_coverage',
                    'ad_requests_ctr',
                    'ad_requests_rpm',
                    'impressions_ctr',
                    'impressions_rpm',
                    'cost_per_click',
                    'last_synced_at',
                    'updated_at',
                ],
            );
        }

        return count($payload);
    }
}