<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class OverpassService
{
    private string $baseUrl;
    private int $cacheTtl;

    public function __construct()
    {
        $this->baseUrl = config('services.overpass.url', 'https://overpass-api.de/api/interpreter');
        $this->cacheTtl = config('services.overpass.cache_ttl', 7) * 24 * 60; // Convert days to minutes
    }

    /**
     * Get points of interest near coordinates
     *
     * @param float $lat
     * @param float $lon
     * @param int $radius in meters (default 5000m = 5km)
     * @return array
     */
    public function getPointsOfInterest(float $lat, float $lon, int $radius = 5000): array
    {
        $cacheKey = "overpass:poi:{$lat}:{$lon}:{$radius}";

        return Cache::remember($cacheKey, $this->cacheTtl, function () use ($lat, $lon, $radius) {
            try {
                // Overpass QL query for tourism and amenity nodes
                $query = "[out:json][timeout:25];
                (
                  node[\"tourism\"~\"attraction|museum|artwork|viewpoint\"](around:{$radius},{$lat},{$lon});
                  node[\"amenity\"~\"restaurant|cafe|bar|theatre|cinema\"](around:{$radius},{$lat},{$lon});
                  node[\"historic\"](around:{$radius},{$lat},{$lon});
                );
                out body;
                >;
                out skel qt;";

                $response = Http::timeout(30)
                    ->asForm()
                    ->post($this->baseUrl, [
                        'data' => $query,
                    ]);

                if ($response->successful()) {
                    $data = $response->json();
                    $elements = $data['elements'] ?? [];
                    $attractions = [];

                    foreach ($elements as $element) {
                        if ($element['type'] === 'node' && !empty($element['tags']['name'])) {
                            $tags = $element['tags'];

                            $attractions[] = [
                                'name' => $tags['name'],
                                'source_id' => (string) $element['id'],
                                'latitude' => $element['lat'],
                                'longitude' => $element['lon'],
                                'category' => $this->determineCategory($tags),
                                'description' => $tags['description'] ?? null,
                                'website' => $tags['website'] ?? null,
                                'opening_hours' => $tags['opening_hours'] ?? null,
                            ];
                        }
                    }

                    return $attractions;
                }

                Log::warning("Overpass API request failed", [
                    'status' => $response->status(),
                    'lat' => $lat,
                    'lon' => $lon,
                ]);

                return [];
            } catch (\Exception $e) {
                Log::error("Overpass API error", [
                    'error' => $e->getMessage(),
                    'lat' => $lat,
                    'lon' => $lon,
                ]);

                return [];
            }
        });
    }

    /**
     * Determine category from OSM tags
     *
     * @param array $tags
     * @return string
     */
    private function determineCategory(array $tags): string
    {
        // Tourism tags
        if (isset($tags['tourism'])) {
            return match ($tags['tourism']) {
                'museum' => 'museum',
                'artwork', 'gallery' => 'cultural',
                'attraction', 'viewpoint' => 'attraction',
                'hotel', 'hostel', 'guest_house' => 'accommodation',
                default => 'tourism',
            };
        }

        // Amenity tags
        if (isset($tags['amenity'])) {
            return match ($tags['amenity']) {
                'restaurant', 'fast_food', 'food_court' => 'restaurant',
                'cafe', 'bar', 'pub' => 'cafe',
                'theatre', 'cinema' => 'entertainment',
                'library' => 'cultural',
                default => 'amenity',
            };
        }

        // Historic tags
        if (isset($tags['historic'])) {
            return 'historic';
        }

        // Leisure tags
        if (isset($tags['leisure'])) {
            return match ($tags['leisure']) {
                'park', 'garden' => 'park',
                'sports_centre', 'stadium' => 'sport',
                default => 'leisure',
            };
        }

        return 'other';
    }

    /**
     * Get restaurants and cafes near coordinates
     *
     * @param float $lat
     * @param float $lon
     * @param int $radius
     * @return array
     */
    public function getRestaurants(float $lat, float $lon, int $radius = 2000): array
    {
        $cacheKey = "overpass:restaurants:{$lat}:{$lon}:{$radius}";

        return Cache::remember($cacheKey, $this->cacheTtl, function () use ($lat, $lon, $radius) {
            try {
                $query = "[out:json][timeout:25];
                (
                  node[\"amenity\"=\"restaurant\"](around:{$radius},{$lat},{$lon});
                  node[\"amenity\"=\"cafe\"](around:{$radius},{$lat},{$lon});
                  node[\"amenity\"=\"bar\"](around:{$radius},{$lat},{$lon});
                );
                out body;";

                $response = Http::timeout(30)
                    ->asForm()
                    ->post($this->baseUrl, [
                        'data' => $query,
                    ]);

                if ($response->successful()) {
                    $data = $response->json();
                    $elements = $data['elements'] ?? [];
                    $restaurants = [];

                    foreach ($elements as $element) {
                        if ($element['type'] === 'node' && !empty($element['tags']['name'])) {
                            $tags = $element['tags'];

                            $restaurants[] = [
                                'name' => $tags['name'],
                                'source_id' => (string) $element['id'],
                                'latitude' => $element['lat'],
                                'longitude' => $element['lon'],
                                'category' => 'restaurant',
                                'cuisine' => $tags['cuisine'] ?? null,
                                'phone' => $tags['phone'] ?? null,
                                'website' => $tags['website'] ?? null,
                                'opening_hours' => $tags['opening_hours'] ?? null,
                            ];
                        }
                    }

                    return $restaurants;
                }

                return [];
            } catch (\Exception $e) {
                Log::error("Overpass restaurants error", [
                    'error' => $e->getMessage(),
                    'lat' => $lat,
                    'lon' => $lon,
                ]);

                return [];
            }
        });
    }

    /**
     * Clear cache for specific coordinates
     *
     * @param float $lat
     * @param float $lon
     * @return void
     */
    public function clearCache(float $lat, float $lon): void
    {
        Cache::forget("overpass:poi:{$lat}:{$lon}:5000");
        Cache::forget("overpass:restaurants:{$lat}:{$lon}:2000");
    }
}