<?php
/**
 * ajax/containers.php
 *
 * Backs the Containers panel (and the container rows nested inside the
 * Pods panel — see ajax/pods.php). All actions go through PodmanClient,
 * i.e. the real libpod REST API over podman.sock; nothing here shells out.
 *
 * Actions (?action=...):
 *   list      GET  -> normalized array of containers for the table view
 *   inspect   GET  (&id=...) -> raw inspect JSON, for a detail dialog
 *   start     POST {"id": "..."}
 *   stop      POST {"id": "...", "timeout": 10}
 *   restart   POST {"id": "...", "timeout": 10}
 *   remove    POST {"id": "...", "force": false}
 *   pause     POST {"id": "..."}
 *   unpause   POST {"id": "..."}
 *   kill      POST {"id": "...", "signal": "SIGKILL"}
 *   rename    POST {"id": "...", "name": "..."}
 *   logs      GET  (&id=...&tail=200) -> plain text
 *   create    POST {"image": "...", "name": "...", "networkMode": "bridge"|"host"|"none"|"<custom-network-name>",
 *                    "ports": [{"hostPort": 8080, "containerPort": 80, "protocol": "tcp"}],
 *                    "volumes": [{"kind": "named"|"path", "source": "myvol"|"/mnt/...", "containerPath": "/data"}],
 *                    "env": [{"key": "...", "value": "..."}], "restartPolicy": "no",
 *                    "privileged": false, "startAfterCreate": true}
 */

declare(strict_types=1);

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

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

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

    case 'inspect':
        $id = (string) ($_GET['id'] ?? '');
        if ($id === '') {
            podman_json_error('Missing id', 400);
        }
        podman_json_response($client->inspectContainer($id));
        break;

    case 'logs':
        $id = (string) ($_GET['id'] ?? '');
        if ($id === '') {
            podman_json_error('Missing id', 400);
        }
        $tail = (int) ($_GET['tail'] ?? 200);
        podman_json_response(['text' => $client->containerLogs($id, $tail)]);
        break;

    case 'start':
        $body = podman_read_json_body();
        $client->startContainer(require_id($body));
        podman_json_response(['status' => 'started']);
        break;

    case 'stop':
        $body = podman_read_json_body();
        $client->stopContainer(require_id($body), (int) ($body['timeout'] ?? $podmanConfig->stopTimeoutSeconds));
        podman_json_response(['status' => 'stopped']);
        break;

    case 'restart':
        $body = podman_read_json_body();
        $client->restartContainer(require_id($body), (int) ($body['timeout'] ?? $podmanConfig->stopTimeoutSeconds));
        podman_json_response(['status' => 'restarted']);
        break;

    case 'remove':
        $body = podman_read_json_body();
        $client->removeContainer(require_id($body), (bool) ($body['force'] ?? false));
        podman_json_response(['status' => 'removed']);
        break;

    case 'pause':
        $body = podman_read_json_body();
        $client->pauseContainer(require_id($body));
        podman_json_response(['status' => 'paused']);
        break;

    case 'unpause':
        $body = podman_read_json_body();
        $client->unpauseContainer(require_id($body));
        podman_json_response(['status' => 'unpaused']);
        break;

    case 'kill':
        $body = podman_read_json_body();
        $client->killContainer(require_id($body), (string) ($body['signal'] ?? 'SIGKILL'));
        podman_json_response(['status' => 'killed']);
        break;

    case 'rename':
        $body = podman_read_json_body();
        $newName = trim((string) ($body['name'] ?? ''));
        if ($newName === '') {
            podman_json_error('Missing name in request body', 400);
        }
        $client->renameContainer(require_id($body), $newName);
        podman_json_response(['status' => 'renamed']);
        break;

    case 'create':
        $body = podman_read_json_body();
        $image = trim((string) ($body['image'] ?? ''));
        if ($image === '') {
            podman_json_error('Missing image in request body', 400);
        }
        $spec = build_container_spec($image, $body);
        // Unlike `podman run`, /containers/create does NOT auto-pull a
        // missing image — it fails outright with a 404 "no such image"
        // (found by live-testing the Create Container form against a
        // freshly-typed image reference that wasn't pulled yet). Retry
        // once after an explicit pull rather than always pulling
        // up-front, so re-creating with an image the user already has
        // stays fast and offline-friendly.
        try {
            $id = $client->createContainer($spec);
        } catch (PodmanApiException $e) {
            if ($e->httpStatus !== 404) {
                throw $e;
            }
            $client->pullImage($image);
            $id = $client->createContainer($spec);
        }
        if ($body['startAfterCreate'] ?? true) {
            $client->startContainer($id);
        }
        podman_json_response(['id' => $id, 'status' => ($body['startAfterCreate'] ?? true) ? 'started' : 'created']);
        break;

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

/**
 * Builds a libpod SpecGenerator body (POST /containers/create) from the
 * WebUI's Create Container form fields. Field names/shapes here
 * (portmappings, netns, networks, mounts, volumes, restart_policy) were
 * verified live against a real podman system service — see
 * PodmanClient::createContainer()'s header comment.
 *
 * @param array<string,mixed> $body
 * @return array<string,mixed>
 */
function build_container_spec(string $image, array $body): array
{
    $spec = ['image' => $image];

    $name = trim((string) ($body['name'] ?? ''));
    if ($name !== '') {
        $spec['name'] = $name;
    }

    $env = [];
    foreach (($body['env'] ?? []) as $row) {
        $key = trim((string) ($row['key'] ?? ''));
        if ($key !== '') {
            $env[$key] = (string) ($row['value'] ?? '');
        }
    }
    if ($env !== []) {
        $spec['env'] = $env;
    }

    $ports = [];
    foreach (($body['ports'] ?? []) as $row) {
        $hostPort = (int) ($row['hostPort'] ?? 0);
        $containerPort = (int) ($row['containerPort'] ?? 0);
        if ($hostPort > 0 && $containerPort > 0) {
            $ports[] = [
                'host_ip' => '',
                'host_port' => $hostPort,
                'container_port' => $containerPort,
                'protocol' => (string) ($row['protocol'] ?? 'tcp'),
            ];
        }
    }
    if ($ports !== []) {
        $spec['portmappings'] = $ports;
    }

    $mounts = [];
    $volumes = [];
    foreach (($body['volumes'] ?? []) as $row) {
        $source = trim((string) ($row['source'] ?? ''));
        $containerPath = trim((string) ($row['containerPath'] ?? ''));
        if ($source === '' || $containerPath === '') {
            continue;
        }
        if (($row['kind'] ?? 'named') === 'path') {
            $mounts[] = ['destination' => $containerPath, 'type' => 'bind', 'source' => $source, 'options' => ['rbind']];
        } else {
            $volumes[] = ['name' => $source, 'dest' => $containerPath];
        }
    }
    if ($mounts !== []) {
        $spec['mounts'] = $mounts;
    }
    if ($volumes !== []) {
        $spec['volumes'] = $volumes;
    }

    // "bridge"/"host"/"none" are podman's own reserved netns modes; any
    // other value is an existing custom podman network's name, attached
    // via the "networks" field instead (verified live: passing a
    // network name through "networks" attaches it without needing an
    // explicit netns mode at all).
    $networkMode = (string) ($body['networkMode'] ?? 'bridge');
    if (in_array($networkMode, ['bridge', 'host', 'none'], true)) {
        $spec['netns'] = ['nsmode' => $networkMode];
    } elseif ($networkMode !== '') {
        $spec['networks'] = [$networkMode => new \stdClass()];
    }

    if (isset($body['restartPolicy']) && $body['restartPolicy'] !== '') {
        $spec['restart_policy'] = (string) $body['restartPolicy'];
    }
    if ($body['privileged'] ?? false) {
        $spec['privileged'] = true;
    }

    return $spec;
}

/** @param array<string,mixed> $body */
function require_id(array $body): string
{
    $id = (string) ($body['id'] ?? '');
    if ($id === '') {
        podman_json_error('Missing id in request body', 400);
    }
    return $id;
}

/**
 * Normalizes libpod's /containers/json entries into exactly what the
 * Containers table (javascript/containers.js) renders — keeping this
 * shaping logic server-side means the frontend never has to know libpod's
 * raw field names/quirks (e.g. Names is an array, State vs Status, etc).
 *
 * @return array<int,array<string,mixed>>
 */
function containers_list(PodmanClient $client): array
{
    $raw = $client->listContainers(true);
    $out = [];

    foreach ($raw as $c) {
        $names = $c['Names'] ?? [];
        $name = is_array($names) && count($names) > 0 ? ltrim((string) $names[0], '/') : podman_short_id((string) ($c['Id'] ?? ''));

        $ports = [];
        foreach (($c['Ports'] ?? []) as $p) {
            if (isset($p['host_port'], $p['container_port'])) {
                $ports[] = "{$p['host_port']}:{$p['container_port']}/" . ($p['protocol'] ?? 'tcp');
            } elseif (isset($p['container_port'])) {
                $ports[] = "{$p['container_port']}/" . ($p['protocol'] ?? 'tcp');
            }
        }

        $startedAt = podman_parse_time($c['StartedAt'] ?? null);
        $state = strtolower((string) ($c['State'] ?? 'unknown'));

        $out[] = [
            'id' => (string) ($c['Id'] ?? ''),
            'shortId' => podman_short_id((string) ($c['Id'] ?? '')),
            'name' => $name,
            'image' => (string) ($c['Image'] ?? ''),
            'state' => $state,
            'status' => (string) ($c['Status'] ?? ''),
            'health' => $c['Health']['Status'] ?? null,
            'ports' => $ports,
            'pod' => $c['Pod'] ?? null,
            'podName' => $c['PodName'] ?? null,
            'uptimeSeconds' => ($state === 'running' && $startedAt !== null) ? (time() - $startedAt) : null,
            'createdAt' => podman_parse_time($c['Created'] ?? null),
        ];
    }

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