<?php

namespace App\Services;

use Illuminate\Http\Client\Pool;
use Illuminate\Http\Client\Response;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Throwable;

class ZipCodeCoordinatesService
{
    private array $resolvedZipCodes = [];

    public function resolve(?float $latitude, ?float $longitude, ?string $zipCode): ?array
    {
        if ($latitude !== null && $longitude !== null) {
            Log::debug('ZipCodeCoordinates resolve using address coordinates', [
                'latitude'  => $latitude,
                'longitude' => $longitude,
                'zip_code'  => $this->normalize($zipCode),
            ]);

            return compact('latitude', 'longitude');
        }

        Log::info('ZipCodeCoordinates fallback to zip code lookup', [
            'zip_code'      => $this->normalize($zipCode),
            'has_latitude'  => $latitude !== null,
            'has_longitude' => $longitude !== null,
            'reason'        => 'missing_address_coordinates',
        ]);

        return $this->findByZipCode($zipCode);
    }

    public function calculateDistance(
        ?float  $originLatitude,
        ?float  $originLongitude,
        ?string $originZipCode,
        ?float  $targetLatitude,
        ?float  $targetLongitude,
        ?string $targetZipCode,
    ): ?float {
        $origin = $this->resolve($originLatitude, $originLongitude, $originZipCode);
        $target = $this->resolve($targetLatitude, $targetLongitude, $targetZipCode);

        return DistanceService::calculate(
            $origin['latitude']  ?? null,
            $origin['longitude'] ?? null,
            $target['latitude']  ?? null,
            $target['longitude'] ?? null,
        );
    }

    public function findByZipCode(?string $zipCode): ?array
    {
        $zipCode = $this->normalize($zipCode);

        if ($zipCode === null) {
            Log::info('ZipCodeCoordinates skipped lookup: invalid zip code');

            return null;
        }

        if (array_key_exists($zipCode, $this->resolvedZipCodes)) {
            Log::debug('ZipCodeCoordinates memory cache hit', [
                'zip_code' => $zipCode,
                'found'    => $this->resolvedZipCodes[$zipCode] !== null,
            ]);

            return $this->resolvedZipCodes[$zipCode];
        }

        if ($this->restoreFromCache($zipCode)) {
            Log::debug('ZipCodeCoordinates persistent cache hit', [
                'zip_code' => $zipCode,
                'found'    => $this->resolvedZipCodes[$zipCode] !== null,
            ]);

            return $this->resolvedZipCodes[$zipCode];
        }

        Log::info('ZipCodeCoordinates Brasil API lookup required', [
            'zip_code' => $zipCode,
            'mode'     => 'single',
        ]);

        $coordinates = $this->requestCoordinates($zipCode);

        $this->remember($zipCode, $coordinates);

        return $coordinates;
    }

    public function preload(iterable $zipCodes): void
    {
        $pending = [];

        foreach ($zipCodes as $zipCode) {
            $zipCode = $this->normalize($zipCode);

            if (
                $zipCode === null
                || array_key_exists($zipCode, $this->resolvedZipCodes)
                || $this->restoreFromCache($zipCode)
            ) {
                continue;
            }

            $pending[$zipCode] = $zipCode;
        }

        if ($pending === []) {
            Log::debug('ZipCodeCoordinates preload skipped: no pending zip codes');

            return;
        }

        Log::info('ZipCodeCoordinates Brasil API lookup required', [
            'mode'             => 'preload',
            'pending_count'    => count($pending),
            'zip_codes_sample' => array_slice(array_values($pending), 0, 20),
        ]);

        try {
            $baseUrl = rtrim((string) config('services.brasil_api.base_url'), '/');

            $responses = Http::pool(fn (Pool $pool) => array_map(
                fn (string $zipCode) => $pool
                    ->as($zipCode)
                    ->acceptJson()
                    ->connectTimeout((int) config('services.brasil_api.connect_timeout', 2))
                    ->timeout((int) config('services.brasil_api.timeout', 3))
                    ->get("{$baseUrl}/api/cep/v2/{$zipCode}"),
                $pending,
            ));
        } catch (Throwable $exception) {
            Log::warning('ZipCodeCoordinates Brasil API preload failed', [
                'pending_count' => count($pending),
                'error'         => $exception->getMessage(),
            ]);

            $responses = [];
        }

        foreach ($pending as $zipCode) {
            $response = $responses[$zipCode] ?? null;

            $coordinates = $response instanceof Response
                ? $this->coordinatesFromResponse($response)
                : null;

            Log::info('ZipCodeCoordinates Brasil API preload response', [
                'zip_code'     => $zipCode,
                'has_response' => $response instanceof Response,
                'status'       => $response instanceof Response ? $response->status() : null,
                'found'        => $coordinates !== null,
                'coordinates'  => $coordinates,
            ]);

            $this->remember($zipCode, $coordinates);
        }
    }

    private function normalize(?string $zipCode): ?string
    {
        $zipCode = preg_replace('/\D/', '', $zipCode ?? '');

        return strlen($zipCode) === 8 ? $zipCode : null;
    }

    private function restoreFromCache(string $zipCode): bool
    {
        $cached = Cache::get("zip-code-coordinates:{$zipCode}");

        if (! is_array($cached) || ! array_key_exists('found', $cached)) {
            return false;
        }

        $this->resolvedZipCodes[$zipCode] = $cached['found']
            ? $cached['coordinates']
            : null;

        return true;
    }

    private function remember(string $zipCode, ?array $coordinates): void
    {
        $this->resolvedZipCodes[$zipCode] = $coordinates;

        Cache::put(
            "zip-code-coordinates:{$zipCode}",
            [
                'found'       => $coordinates !== null,
                'coordinates' => $coordinates,
            ],
            now()->addSeconds(
                $coordinates !== null
                    ? (int) config('services.brasil_api.cep_cache_ttl', 2592000)
                    : (int) config('services.brasil_api.cep_failure_cache_ttl', 600)
            )
        );
    }

    private function requestCoordinates(string $zipCode): ?array
    {
        try {
            Log::info('ZipCodeCoordinates calling Brasil API', [
                'zip_code' => $zipCode,
                'base_url' => rtrim((string) config('services.brasil_api.base_url'), '/'),
            ]);

            $response = Http::baseUrl(rtrim((string) config('services.brasil_api.base_url'), '/'))
                ->acceptJson()
                ->connectTimeout((int) config('services.brasil_api.connect_timeout', 2))
                ->timeout((int) config('services.brasil_api.timeout', 3))
                ->get("api/cep/v2/{$zipCode}");

            $coordinates = $this->coordinatesFromResponse($response);

            Log::info('ZipCodeCoordinates Brasil API response', [
                'zip_code'    => $zipCode,
                'status'      => $response->status(),
                'found'       => $coordinates !== null,
                'coordinates' => $coordinates,
            ]);

            return $coordinates;
        } catch (Throwable $exception) {
            Log::warning('ZipCodeCoordinates Brasil API request failed', [
                'zip_code' => $zipCode,
                'error'    => $exception->getMessage(),
            ]);

            return null;
        }
    }

    private function coordinatesFromResponse(Response $response): ?array
    {
        if (! $response->successful()) {
            return null;
        }

        $latitude  = $response->json('location.coordinates.latitude');
        $longitude = $response->json('location.coordinates.longitude');

        if (! is_numeric($latitude) || ! is_numeric($longitude)) {
            return null;
        }

        $latitude  = (float) $latitude;
        $longitude = (float) $longitude;

        if ($latitude < -90 || $latitude > 90 || $longitude < -180 || $longitude > 180) {
            return null;
        }

        return compact('latitude', 'longitude');
    }
}