<?php
header('Content-Type: application/json');
require_once dirname(__DIR__) . '/include/config.php';

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['ok' => false, 'error' => 'Method not allowed']);
    exit;
}

$host1      = trim($_POST['host1']      ?? '');
$host2      = trim($_POST['host2']      ?? '');
$mySlot     = trim($_POST['my_slot']    ?? 'host1');   // 'host1', 'host2', 'host3', ...
$myHostname = trim($_POST['my_hostname'] ?? '');

if (empty($host1)) {
    echo json_encode(['ok' => false, 'error' => 'HOST1 hostname is required']);
    exit;
}

// Validate slot — must be host\d+
if (!preg_match('/^host\d+$/', $mySlot)) {
    echo json_encode(['ok' => false, 'error' => 'Invalid slot']);
    exit;
}

// ── Write HOST1 / HOST2 into master.conf ─────────────────────────────────────────────────────
$master = vv_read_conf_raw('master.conf');
if ($master === '') {
    echo json_encode(['ok' => false, 'error' => 'master.conf not found — check SCRIPTS_DIR in varaverk.cfg']);
    exit;
}

// Replace HOST1 and HOST2 lines (preserving indentation)
$master = preg_replace(
    '/^(\s*HOST1\s*=\s*).*$/m',
    '${1}"' . addslashes($host1) . '"',
    $master
);
$master = preg_replace(
    '/^(\s*HOST2\s*=\s*).*$/m',
    '${1}"' . addslashes($host2) . '"',
    $master
);

// For partner slots beyond HOST2 — ensure the slot line exists in master.conf
$slotNum = (int) preg_replace('/\D/', '', $mySlot);
if ($slotNum > 2 && !empty($myHostname)) {
    $hostKey = 'HOST' . $slotNum;
    if (!preg_match('/^\s*' . $hostKey . '\s*=/m', $master)) {
        // Append after HOST2 line
        $master = preg_replace(
            '/^(\s*HOST2\s*=.*$)/m',
            '$1' . "\n    {$hostKey}=\"" . addslashes($myHostname) . '"',
            $master
        );
    } else {
        $master = preg_replace(
            '/^(\s*' . $hostKey . '\s*=\s*).*$/m',
            '${1}"' . addslashes($myHostname) . '"',
            $master
        );
    }
}

if (!vv_write_conf_raw('master.conf', $master)) {
    echo json_encode(['ok' => false, 'error' => 'Failed to write master.conf']);
    exit;
}

// ── Create host*.conf from template ──────────────────────────────────────────────────────────
$hostId    = strtoupper($mySlot);          // HOST1, HOST2, HOST3 ...
$hostIdLow = strtolower($mySlot);          // host1, host2, host3 ...
$confFile  = $hostIdLow . '.conf';

// Only create if it doesn't already exist — never overwrite an existing conf
if (!file_exists(CONF_DIR . '/' . $confFile)) {
    $template = @file_get_contents(CONF_DIR . '/host.conf.template');
    if ($template === false) {
        $template = @file_get_contents(SCRIPTS_DIR . '/Configurations/host.conf.template');
    }
    if ($template !== false) {
        // Derive SSH key path from hostname convention
        // unRAID-MyServer → /root/.ssh/myserver_rsync_automation
        $sshOwner   = strtolower(preg_replace('/^unraid-/i', '', $myHostname));
        $sshKeyPath = '/root/.ssh/' . $sshOwner . '_rsync_automation';

        $conf = str_replace('HOSTN', $hostId,    $template);
        $conf = str_replace('hostn', $hostIdLow, $conf);
        // Pre-fill the SSH key path
        $conf = preg_replace(
            '/^(\s*' . $hostId . '_SSH_KEY\s*=\s*)""/m',
            '${1}"' . $sshKeyPath . '"',
            $conf
        );

        if (!vv_write_conf_raw($confFile, $conf)) {
            echo json_encode(['ok' => false, 'error' => "Failed to write $confFile"]);
            exit;
        }
    }
    // Template missing is non-fatal — user can create the conf manually
}

echo json_encode(['ok' => true, 'host_id' => $hostId, 'conf_file' => $confFile]);