<?php

namespace App\Services;

use App\DTOs\FlightStatData;
use App\Models\Aircraft;
use App\Models\IataEquipmentCode;
use Carbon\CarbonImmutable;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class FlightStatsService
{

    public function fetchOtherDays(string $airlineCode, string $flightNumber): array
    {
        $url = sprintf(
            'https://www.flightstats.com/v2/api-next/flight-tracker/other-days/%s/%s',
            $airlineCode,
            $flightNumber,
        );

        $response = Http::withOptions([
            'verify' => config('app.verify_ssl'),
        ])->get($url);

        if (!$response->successful()) {
            return [];
        }

        $data = $response->json('data');

        if (!is_array($data)) {
            return [];
        }

        return $data;
    }

    public function fetchFlightData(string $airlineCode, string $flightNumber, ?CarbonImmutable $date = null): ?FlightStatData
    {
        $specificDate = $date !== null;
        $date ??= now()->utc()->toImmutable();

        $data = $this->fetchForDate($airlineCode, $flightNumber, $date);

        if ($data || $specificDate) return $data;

        $otherDays = $this->fetchOtherDays($airlineCode, $flightNumber);

        $pastDays = collect($otherDays)
            ->filter(fn($day) => !empty($day['flights']))
            ->sortByDesc(fn($day) => $day['year'] . $day['date1']);

        foreach ($pastDays as $day) {
            $pastDate = CarbonImmutable::createFromFormat('Y-d-M', $day['year'] . '-' . $day['date1']);
            $result = $this->fetchForDate($airlineCode, $flightNumber, $pastDate);
            if ($result) return $result;
        }

        return null;
    }

    protected function fetchForDate(string $airlineCode, string $flightNumber, CarbonImmutable $date): ?FlightStatData
    {
        $url = sprintf(
            'https://www.flightstats.com/v2/api-next/flight-tracker/%s/%s/%d/%d/%d',
            $airlineCode,
            $flightNumber,
            $date->year,
            $date->month,
            $date->day,
        );

        $response = Http::withOptions([
            'verify' => config('app.verify_ssl'),
        ])->get($url);

        if (!$response->successful()) {
            Log::warning("FlightStats request failed for {$airlineCode}{$flightNumber}: HTTP {$response->status()}");
            return null;
        }

        $flightData = $response->json('data');

        if (empty($flightData)) return null;

        return FlightStatData::fromApiResponse($flightData);
    }

    public function guessAircraftFromIata(string $iataCode): ?Aircraft
    {
        $equipment = IataEquipmentCode::where('iata_code', $iataCode)->first();

        if (!$equipment) {
            Log::info("Unknown IATA equipment code: {$iataCode}");
            return null;
        }

        $aircraft = Aircraft::where('designator', $equipment->icao_code)
            ->orderByDesc('preferred')
            ->orderBy('id')
            ->first();

        if (!$aircraft) {
            Log::info("No aircraft found for ICAO: {$equipment->icao_code} (IATA: {$iataCode})");
        }

        return $aircraft;
    }
}