<?php

namespace App\Services\IceCandidate;

use App\Contracts\IceCandidateProviderInterface;
use App\DTOs\IceCandidatesDto;
use App\Services\IceCandidate\Providers\ConvexSolIceCandidateProvider;
use App\Services\IceCandidate\Providers\MeteredIceCandidateProvider;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Manager;
use Throwable;

class IceCandidateManager extends Manager implements IceCandidateProviderInterface
{
    public function getDefaultDriver(): string
    {
        return $this->config->get('services.ice.default', 'metered');
    }

    public function getFallbackDriver(): ?string
    {
        return $this->config->get('services.ice.fallback', 'convexsol');
    }

    /**
     * Retrieve ICE candidates with automatic failover and structured logging.
     */
    public function getIceCandidates(): IceCandidatesDto
    {
        $primaryDriver = $this->getDefaultDriver();

        try {
            return $this->driver($primaryDriver)->getIceCandidates();
        } catch (Throwable $primaryException) {
            $fallbackDriver = $this->getFallbackDriver();

            if ($fallbackDriver && $fallbackDriver !== $primaryDriver) {
                Log::warning("Primary ICE candidate provider [{$primaryDriver}] failed: {$primaryException->getMessage()}. Falling back to [{$fallbackDriver}].", [
                    'primary_driver' => $primaryDriver,
                    'fallback_driver' => $fallbackDriver,
                    'error' => $primaryException->getMessage(),
                ]);

                try {
                    return $this->driver($fallbackDriver)->getIceCandidates();
                } catch (Throwable $fallbackException) {
                    Log::error("Fallback ICE candidate provider [{$fallbackDriver}] also failed: {$fallbackException->getMessage()}. Using default STUN servers.", [
                        'primary_error' => $primaryException->getMessage(),
                        'fallback_error' => $fallbackException->getMessage(),
                    ]);

                    return IceCandidatesDto::defaultStun();
                }
            }

            Log::error("ICE candidate provider [{$primaryDriver}] failed without fallback: {$primaryException->getMessage()}. Using default STUN servers.", [
                'error' => $primaryException->getMessage(),
            ]);

            return IceCandidatesDto::defaultStun();
        }
    }

    protected function createMeteredDriver(): IceCandidateProviderInterface
    {
        $config = $this->config->get('services.ice.providers.metered', [
            'url' => $this->config->get('services.metered.url'),
            'key' => $this->config->get('services.metered.key'),
        ]);

        return new MeteredIceCandidateProvider($config);
    }

    protected function createConvexsolDriver(): IceCandidateProviderInterface
    {
        $config = $this->config->get('services.ice.providers.convexsol', [
            'username' => $this->config->get('services.convexsol.username'),
            'password' => $this->config->get('services.convexsol.password'),
            'turn_urls' => $this->config->get('services.convexsol.turn_urls'),
            'stun_urls' => $this->config->get('services.convexsol.stun_urls'),
        ]);

        return new ConvexSolIceCandidateProvider($config);
    }
}