<?php

use App\Actions\Proxy\SaveProxyConfiguration;
use App\Enums\ProxyTypes;
use App\Models\Application;
use App\Models\Server;
use Symfony\Component\Yaml\Yaml;

/**
 * Check if a network name is a Docker predefined system network.
 * These networks cannot be created, modified, or managed by docker network commands.
 *
 * @param  string  $network  Network name to check
 * @return bool True if it's a predefined network that should be skipped
 */
function isDockerPredefinedNetwork(string $network): bool
{
    // Only filter 'default' and 'host' to match existing codebase patterns
    // See: bootstrap/helpers/parsers.php:891, bootstrap/helpers/shared.php:689,748
    return in_array($network, ['default', 'host'], true);
}

function collectProxyDockerNetworksByServer(Server $server)
{
    if (! $server->isFunctional()) {
        return collect();
    }
    $proxyType = $server->proxyType();
    if (is_null($proxyType) || $proxyType === 'NONE') {
        return collect();
    }
    $networks = instant_remote_process(['docker inspect --format="{{json .NetworkSettings.Networks }}" coolify-proxy'], $server, false);

    return collect($networks)->map(function ($network) {
        return collect(json_decode($network))->keys();
    })->flatten()->unique();
}
function collectDockerNetworksByServer(Server $server)
{
    $allNetworks = collect([]);
    if ($server->isSwarm()) {
        $networks = collect($server->swarmDockers)->map(function ($docker) {
            return $docker['network'];
        });
    } else {
        // Standalone networks
        $networks = collect($server->standaloneDockers)->map(function ($docker) {
            return $docker['network'];
        });
    }
    $allNetworks = $allNetworks->merge($networks);
    // Service networks
    foreach ($server->services()->get() as $service) {
        if ($service->isRunning()) {
            $networks->push($service->networks());
        }
        $allNetworks->push($service->networks());
    }
    // Docker compose based apps
    $docker_compose_apps = $server->dockerComposeBasedApplications();
    foreach ($docker_compose_apps as $app) {
        if ($app->isRunning()) {
            $networks->push($app->uuid);
        }
        $allNetworks->push($app->uuid);
    }
    // Docker compose based preview deployments
    $docker_compose_previews = $server->dockerComposeBasedPreviewDeployments();
    foreach ($docker_compose_previews as $preview) {
        if (! $preview->isRunning()) {
            continue;
        }
        $pullRequestId = $preview->pull_request_id;
        $applicationId = $preview->application_id;
        $application = Application::find($applicationId);
        if (! $application) {
            continue;
        }
        $network = "{$application->uuid}-{$pullRequestId}";
        $networks->push($network);
        $allNetworks->push($network);
    }
    $networks = collect($networks)->flatten()->unique()->filter(function ($network) {
        return ! isDockerPredefinedNetwork($network);
    });
    $allNetworks = $allNetworks->flatten()->unique()->filter(function ($network) {
        return ! isDockerPredefinedNetwork($network);
    });
    if ($server->isSwarm()) {
        if ($networks->count() === 0) {
            $networks = collect(['coolify-overlay']);
            $allNetworks = collect(['coolify-overlay']);
        }
    } else {
        if ($networks->count() === 0) {
            $networks = collect(['coolify']);
            $allNetworks = collect(['coolify']);
        }
    }

    return [
        'networks' => $networks,
        'allNetworks' => $allNetworks,
    ];
}
function connectProxyToNetworks(Server $server)
{
    ['networks' => $networks] = collectDockerNetworksByServer($server);
    if ($server->isSwarm()) {
        $commands = $networks->map(function ($network) {
            return [
                "docker network ls --format '{{.Name}}' | grep '^$network$' >/dev/null || docker network create --driver overlay --attachable $network >/dev/null",
                "docker network connect $network coolify-proxy >/dev/null 2>&1 || true",
                "echo 'Successfully connected coolify-proxy to $network network.'",
            ];
        });
    } else {
        $commands = $networks->map(function ($network) {
            return [
                "docker network ls --format '{{.Name}}' | grep '^$network$' >/dev/null || docker network create --attachable $network >/dev/null",
                "docker network connect $network coolify-proxy >/dev/null 2>&1 || true",
                "echo 'Successfully connected coolify-proxy to $network network.'",
            ];
        });
    }

    return $commands->flatten();
}

/**
 * Generate shell commands to fix a Docker network that has an IPv6 gateway with CIDR notation.
 *
 * Docker 25+ may store IPv6 gateways with CIDR (e.g. fd7d:f7d2:7e77::1/64), which causes
 * ParseAddr errors in Docker Compose. This detects the issue and recreates the network.
 *
 * @see https://github.com/coollabsio/coolify/issues/8649
 *
 * @param  string  $network  Network name to check and fix
 * @return array Shell commands to execute on the remote server
 */
function fixNetworkIpv6CidrGateway(string $network): array
{
    return [
        "if docker network inspect {$network} >/dev/null 2>&1; then",
        "  IPV6_GW=\$(docker network inspect {$network} --format '{{range .IPAM.Config}}{{.Gateway}} {{end}}' 2>/dev/null | tr ' ' '\n' | grep '/' || true)",
        '  if [ -n "$IPV6_GW" ]; then',
        "    echo \"Fixing network {$network}: IPv6 gateway has CIDR notation (\$IPV6_GW)\"",
        "    CONTAINERS=\$(docker network inspect {$network} --format '{{range .Containers}}{{.Name}} {{end}}' 2>/dev/null)",
        '    for c in $CONTAINERS; do',
        "      [ -n \"\$c\" ] && docker network disconnect {$network} \"\$c\" 2>/dev/null || true",
        '    done',
        "    docker network rm {$network} 2>/dev/null || true",
        "    docker network create --attachable {$network} 2>/dev/null || true",
        '    for c in $CONTAINERS; do',
        "      [ -n \"\$c\" ] && [ \"\$c\" != \"coolify-proxy\" ] && docker network connect {$network} \"\$c\" 2>/dev/null || true",
        '    done',
        '  fi',
        'fi',
    ];
}

/**
 * Ensures all required networks exist before docker compose up.
 * This must be called BEFORE docker compose up since the compose file declares networks as external.
 *
 * Also detects and fixes networks with IPv6 CIDR gateway notation that causes ParseAddr errors.
 *
 * @param  Server  $server  The server to ensure networks on
 * @return \Illuminate\Support\Collection Commands to create networks if they don't exist
 */
function ensureProxyNetworksExist(Server $server)
{
    ['allNetworks' => $networks] = collectDockerNetworksByServer($server);

    if ($server->isSwarm()) {
        $commands = $networks->map(function ($network) {
            return array_merge(
                fixNetworkIpv6CidrGateway($network),
                [
                    "echo 'Ensuring network $network exists...'",
                    "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --driver overlay --attachable $network",
                ]
            );
        });
    } else {
        $commands = $networks->map(function ($network) {
            return array_merge(
                fixNetworkIpv6CidrGateway($network),
                [
                    "echo 'Ensuring network $network exists...'",
                    "docker network ls --format '{{.Name}}' | grep -q '^{$network}$' || docker network create --attachable $network",
                ]
            );
        });
    }

    return $commands->flatten();
}

function extractCustomProxyCommands(Server $server, string $existing_config): array
{
    $custom_commands = [];
    $proxy_type = $server->proxyType();

    if ($proxy_type !== ProxyTypes::TRAEFIK->value || empty($existing_config)) {
        return $custom_commands;
    }

    try {
        $yaml = Yaml::parse($existing_config);
        $existing_commands = data_get($yaml, 'services.traefik.command', []);

        if (empty($existing_commands)) {
            return $custom_commands;
        }

        // Define default commands that Coolify generates
        $default_command_prefixes = [
            '--ping=',
            '--api.',
            '--entrypoints.http.address=',
            '--entrypoints.https.address=',
            '--entrypoints.http.http.encodequerysemicolons=',
            '--entryPoints.http.http2.maxConcurrentStreams=',
            '--entrypoints.https.http.encodequerysemicolons=',
            '--entryPoints.https.http2.maxConcurrentStreams=',
            '--entrypoints.https.http3',
            '--providers.file.',
            '--certificatesresolvers.',
            '--providers.docker',
            '--providers.swarm',
            '--log.level=',
            '--accesslog.',
        ];

        // Extract commands that don't match default prefixes (these are custom)
        foreach ($existing_commands as $command) {
            $is_default = false;
            foreach ($default_command_prefixes as $prefix) {
                if (str_starts_with($command, $prefix)) {
                    $is_default = true;
                    break;
                }
            }
            if (! $is_default) {
                $custom_commands[] = $command;
            }
        }
    } catch (\Exception $e) {
        // If we can't parse the config, return empty array
        // Silently fail to avoid breaking the proxy regeneration
    }

    return $custom_commands;
}
function generateDefaultProxyConfiguration(Server $server, array $custom_commands = [])
{
    $proxy_path = $server->proxyPath();
    $proxy_type = $server->proxyType();

    if ($server->isSwarm()) {
        $networks = collect($server->swarmDockers)->map(function ($docker) {
            return $docker['network'];
        })->unique();
        if ($networks->count() === 0) {
            $networks = collect(['coolify-overlay']);
        }
    } else {
        $networks = collect($server->standaloneDockers)->map(function ($docker) {
            return $docker['network'];
        })->unique();
        if ($networks->count() === 0) {
            $networks = collect(['coolify']);
        }
    }

    $array_of_networks = collect([]);
    $filtered_networks = collect([]);
    $networks->map(function ($network) use ($array_of_networks, $filtered_networks) {
        if (isDockerPredefinedNetwork($network)) {
            return; // Predefined networks cannot be used in network configuration
        }

        $array_of_networks[$network] = [
            'external' => true,
        ];
        $filtered_networks->push($network);
    });
    if ($proxy_type === ProxyTypes::TRAEFIK->value) {
        $labels = [
            'traefik.enable=true',
            'traefik.http.routers.traefik.entrypoints=http',
            'traefik.http.routers.traefik.service=api@internal',
            'traefik.http.services.traefik.loadbalancer.server.port=8080',
            'coolify.managed=true',
            'coolify.proxy=true',
        ];
        $config = [
            'name' => 'coolify-proxy',
            'networks' => $array_of_networks->toArray(),
            'services' => [
                'traefik' => [
                    'container_name' => 'coolify-proxy',
                    'image' => 'traefik:v3.6',
                    'restart' => RESTART_MODE,
                    'extra_hosts' => [
                        'host.docker.internal:host-gateway',
                    ],
                    'networks' => $filtered_networks->toArray(),
                    'ports' => [
                        '80:80',
                        '443:443',
                        '443:443/udp',
                        '8080:8080',
                    ],
                    'healthcheck' => [
                        'test' => 'wget -qO- http://localhost:80/ping || exit 1',
                        'interval' => '4s',
                        'timeout' => '2s',
                        'retries' => 5,
                    ],
                    'volumes' => [
                        '/var/run/docker.sock:/var/run/docker.sock:ro',

                    ],
                    'command' => [
                        '--ping=true',
                        '--ping.entrypoint=http',
                        '--api.dashboard=true',
                        '--entrypoints.http.address=:80',
                        '--entrypoints.https.address=:443',
                        '--entrypoints.http.http.encodequerysemicolons=true',
                        '--entryPoints.http.http2.maxConcurrentStreams=250',
                        '--entrypoints.https.http.encodequerysemicolons=true',
                        '--entryPoints.https.http2.maxConcurrentStreams=250',
                        '--entrypoints.https.http3',
                        '--providers.file.directory=/traefik/dynamic/',
                        '--providers.file.watch=true',
                        '--certificatesresolvers.letsencrypt.acme.httpchallenge=true',
                        '--certificatesresolvers.letsencrypt.acme.httpchallenge.entrypoint=http',
                        '--certificatesresolvers.letsencrypt.acme.storage=/traefik/acme.json',
                    ],
                    'labels' => $labels,
                ],
            ],
        ];
        if (isDev()) {
            $config['services']['traefik']['command'][] = '--api.insecure=true';
            $config['services']['traefik']['command'][] = '--log.level=debug';
            $config['services']['traefik']['command'][] = '--accesslog.filepath=/traefik/access.log';
            $config['services']['traefik']['command'][] = '--accesslog.bufferingsize=100';
            $config['services']['traefik']['volumes'][] = '/var/lib/docker/volumes/coolify_dev_coolify_data/_data/proxy/:/traefik';
        } else {
            $config['services']['traefik']['command'][] = '--api.insecure=false';
            $config['services']['traefik']['volumes'][] = "{$proxy_path}:/traefik";
        }
        if ($server->isSwarm()) {
            data_forget($config, 'services.traefik.container_name');
            data_forget($config, 'services.traefik.restart');
            data_forget($config, 'services.traefik.labels');

            $config['services']['traefik']['command'][] = '--providers.swarm.endpoint=unix:///var/run/docker.sock';
            $config['services']['traefik']['command'][] = '--providers.swarm.exposedbydefault=false';
            $config['services']['traefik']['deploy'] = [
                'labels' => $labels,
                'placement' => [
                    'constraints' => [
                        'node.role==manager',
                    ],
                ],
            ];
        } else {
            $config['services']['traefik']['command'][] = '--providers.docker=true';
            $config['services']['traefik']['command'][] = '--providers.docker.exposedbydefault=false';
        }

        // Append custom commands (e.g., trustedIPs for Cloudflare)
        if (! empty($custom_commands)) {
            foreach ($custom_commands as $custom_command) {
                $config['services']['traefik']['command'][] = $custom_command;
            }
        }
    } elseif ($proxy_type === 'CADDY') {
        $config = [
            'networks' => $array_of_networks->toArray(),
            'services' => [
                'caddy' => [
                    'container_name' => 'coolify-proxy',
                    'image' => 'lucaslorentz/caddy-docker-proxy:2.8-alpine',
                    'restart' => RESTART_MODE,
                    'extra_hosts' => [
                        'host.docker.internal:host-gateway',
                    ],
                    'environment' => [
                        'CADDY_DOCKER_POLLING_INTERVAL=5s',
                        'CADDY_DOCKER_CADDYFILE_PATH=/dynamic/Caddyfile',
                    ],
                    'networks' => $filtered_networks->toArray(),
                    'ports' => [
                        '80:80',
                        '443:443',
                        '443:443/udp',
                    ],
                    'labels' => [
                        'coolify.managed=true',
                        'coolify.proxy=true',
                    ],
                    'volumes' => [
                        '/var/run/docker.sock:/var/run/docker.sock:ro',
                        "{$proxy_path}/dynamic:/dynamic",
                        "{$proxy_path}/config:/config",
                        "{$proxy_path}/data:/data",
                    ],
                ],
            ],
        ];
    } else {
        return null;
    }

    $config = Yaml::dump($config, 12, 2);
    SaveProxyConfiguration::run($server, $config);

    return $config;
}

function getExactTraefikVersionFromContainer(Server $server): ?string
{
    try {
        Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Checking for exact version");

        // Method A: Execute traefik version command (most reliable)
        $versionCommand = "docker exec coolify-proxy traefik version 2>/dev/null | grep -oP 'Version:\s+\K\d+\.\d+\.\d+'";
        Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Running: {$versionCommand}");

        $output = instant_remote_process([$versionCommand], $server, false);

        if (! empty(trim($output))) {
            $version = trim($output);
            Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Detected exact version from command: {$version}");

            return $version;
        }

        // Method B: Try OCI label as fallback
        $labelCommand = "docker inspect coolify-proxy --format '{{index .Config.Labels \"org.opencontainers.image.version\"}}' 2>/dev/null";
        Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Trying OCI label");

        $label = instant_remote_process([$labelCommand], $server, false);

        if (! empty(trim($label))) {
            // Extract version number from label (might have 'v' prefix)
            if (preg_match('/(\d+\.\d+\.\d+)/', trim($label), $matches)) {
                Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Detected from OCI label: {$matches[1]}");

                return $matches[1];
            }
        }

        Log::debug("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Could not detect exact version");

        return null;
    } catch (\Exception $e) {
        Log::error("getExactTraefikVersionFromContainer: Server '{$server->name}' (ID: {$server->id}) - Error: ".$e->getMessage());

        return null;
    }
}

function getTraefikVersionFromDockerCompose(Server $server): ?string
{
    try {
        Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Starting version detection");

        // Try to get exact version from running container (e.g., "3.6.0")
        $exactVersion = getExactTraefikVersionFromContainer($server);
        if ($exactVersion) {
            Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Using exact version: {$exactVersion}");

            return $exactVersion;
        }

        // Fallback: Check image tag (current method)
        Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Falling back to image tag detection");

        $containerName = 'coolify-proxy';
        $inspectCommand = "docker inspect {$containerName} --format '{{.Config.Image}}' 2>/dev/null";

        $image = instant_remote_process([$inspectCommand], $server, false);

        if (empty(trim($image))) {
            Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Container '{$containerName}' not found or not running");

            return null;
        }

        $image = trim($image);
        Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Running container image: {$image}");

        // Extract version from image string (e.g., "traefik:v3.6" or "traefik:3.6.0" or "traefik:latest")
        if (preg_match('/traefik:(v?\d+\.\d+(?:\.\d+)?|latest)/i', $image, $matches)) {
            Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Extracted version from image tag: {$matches[1]}");

            return $matches[1];
        }

        Log::debug("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Image format doesn't match expected pattern: {$image}");

        return null;
    } catch (\Exception $e) {
        Log::error("getTraefikVersionFromDockerCompose: Server '{$server->name}' (ID: {$server->id}) - Error: ".$e->getMessage());

        return null;
    }
}