<?php
/**
 * ajax/networks.php
 *
 * Backs the Networks panel. See docs/ARCHITECTURE.md section 8 for why
 * networks created here are netavark-backed and deliberately isolated
 * from Docker's own docker0/custom-network space.
 *
 * Actions (?action=...):
 *   list     GET  -> normalized network list with subnet/gateway/usage
 *   create   POST {"name": "...", "driver": "bridge", "subnet": "...", "gateway": "..."}
 *   remove   POST {"name": "...", "force": false}
 */

declare(strict_types=1);

require __DIR__ . '/../include/bootstrap.php';

$action = $_GET['action'] ?? '';

switch ($action) {
    case 'list':
        podman_json_response(networks_list($client));
        break;

    case 'create':
        $body = podman_read_json_body();
        $name = (string) ($body['name'] ?? '');
        if ($name === '') {
            podman_json_error('Missing name in request body', 400);
        }
        podman_json_response($client->createNetwork(
            $name,
            (string) ($body['driver'] ?? 'bridge'),
            isset($body['subnet']) ? (string) $body['subnet'] : null,
            isset($body['gateway']) ? (string) $body['gateway'] : null
        ));
        break;

    case 'remove':
        $body = podman_read_json_body();
        $name = (string) ($body['name'] ?? '');
        if ($name === '') {
            podman_json_error('Missing name in request body', 400);
        }
        // podman0, the default bridge, refuses removal API-side — no
        // special-casing needed here, PodmanApiException surfaces podman's
        // own rejection message as-is.
        $client->removeNetwork($name, (bool) ($body['force'] ?? false));
        podman_json_response(['status' => 'removed']);
        break;

    default:
        podman_json_error("Unknown action '{$action}'", 400);
}

/** @return array<int,array<string,mixed>> */
function networks_list(PodmanClient $client): array
{
    $raw = $client->listNetworks();

    $usageCounts = [];
    foreach ($client->listContainers(true) as $c) {
        $nets = $c['Networks'] ?? [];
        if (is_array($nets)) {
            foreach ($nets as $netName) {
                if (is_string($netName)) {
                    $usageCounts[$netName] = ($usageCounts[$netName] ?? 0) + 1;
                }
            }
        }
    }

    $out = [];
    foreach ($raw as $n) {
        $name = (string) ($n['name'] ?? '');
        $subnets = $n['subnets'] ?? [];
        $subnet = is_array($subnets) && count($subnets) > 0 ? (string) ($subnets[0]['subnet'] ?? '') : '';
        $gateway = is_array($subnets) && count($subnets) > 0 ? (string) ($subnets[0]['gateway'] ?? '') : '';

        $out[] = [
            'name' => $name,
            'driver' => (string) ($n['driver'] ?? 'bridge'),
            'subnet' => $subnet,
            'gateway' => $gateway,
            'isDefault' => $name === 'podman',
            'containers' => $usageCounts[$name] ?? 0,
        ];
    }

    usort($out, static fn($a, $b) => strcmp($a['name'], $b['name']));
    return $out;
}