<?php
/**
 * ajax/volumes.php
 *
 * Backs the Volumes panel. Bind-mounted appdata (e.g. /mnt/user/appdata/...)
 * intentionally does not appear here — only Podman-managed named volumes
 * do, since bind mounts aren't a libpod-managed resource at all (see
 * docs/ARCHITECTURE.md section 9).
 *
 * Actions (?action=...):
 *   list     GET  -> normalized volume list, with usedBy counts
 *   create   POST {"name": "...", "driver": "local"}
 *   remove   POST {"name": "...", "force": false}
 */

declare(strict_types=1);

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

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

switch ($action) {
    case 'list':
        podman_json_response(volumes_list($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->createVolume($name, (string) ($body['driver'] ?? 'local')));
        break;

    case 'remove':
        $body = podman_read_json_body();
        $name = (string) ($body['name'] ?? '');
        if ($name === '') {
            podman_json_error('Missing name in request body', 400);
        }
        $client->removeVolume($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 volumes_list(PodmanClient $client): array
{
    $raw = $client->listVolumes();

    $usageCounts = [];
    foreach ($client->listContainers(true) as $c) {
        foreach (($c['Mounts'] ?? []) as $mount) {
            $volName = $mount['Name'] ?? null;
            if (is_string($volName) && $volName !== '') {
                $usageCounts[$volName] = ($usageCounts[$volName] ?? 0) + 1;
            }
        }
    }

    $out = [];
    foreach ($raw as $v) {
        $name = (string) ($v['Name'] ?? '');
        $out[] = [
            'name' => $name,
            'driver' => (string) ($v['Driver'] ?? 'local'),
            'mountpoint' => (string) ($v['Mountpoint'] ?? ''),
            'createdAt' => podman_parse_time($v['CreatedAt'] ?? null),
            'usedBy' => $usageCounts[$name] ?? 0,
        ];
    }

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