<?php
// Scheduler — manages schedule.json and /etc/cron.d/varaverk.
// schedule.json is per-host, never synced.

require_once __DIR__ . '/config.php';

define('SCHEDULE_FILE', '/boot/config/plugins/varaverk/schedule.json');
define('CRON_FILE',     '/etc/cron.d/varaverk');
define('CRON_USER',     'root');

function vv_schedule_load(): array {
    if (!file_exists(SCHEDULE_FILE)) return [];
    $data = json_decode(file_get_contents(SCHEDULE_FILE), true);
    return is_array($data) ? $data : [];
}

function vv_schedule_save(array $schedule): bool {
    $dir = dirname(SCHEDULE_FILE);
    if (!is_dir($dir)) mkdir($dir, 0755, true);
    return file_put_contents(SCHEDULE_FILE, json_encode($schedule, JSON_PRETTY_PRINT)) !== false;
}

function vv_schedule_update(string $id, bool $enabled, string $cron): bool {
    $schedule = vv_schedule_load();
    $schedule[$id] = [
        'id'       => $id,
        'enabled'  => $enabled,
        'cron'     => $cron,
        'updated'  => date('c'),
    ];
    if (!vv_schedule_save($schedule)) return false;
    return vv_cron_rebuild($schedule);
}

define('LOG_DIR', '/var/log/varaverk');

function vv_cron_rebuild(array $schedule): bool {
    if (!is_dir(LOG_DIR)) mkdir(LOG_DIR, 0755, true);

    $lines   = ["# Varaverk — managed by plugin, do not edit manually"];
    $lines[] = "# Regenerated: " . date('Y-m-d H:i:s');
    $lines[] = "";

    $scriptsDir = SCRIPTS_DIR;
    foreach ($schedule as $entry) {
        if (empty($entry['enabled']) || empty($entry['cron']) || empty($entry['id'])) continue;
        $script = "$scriptsDir/{$entry['id']}";
        $cron   = $entry['cron'];
        $lines[] = "$cron " . CRON_USER . " bash \"$script\" >> " . LOG_DIR . "/jobs.log 2>&1";
    }
    $lines[] = "";

    return file_put_contents(CRON_FILE, implode("\n", $lines)) !== false;
}

// Walk the scripts repo and return the job tree:
// orchestrators as top-level, individual scripts as children
function vv_job_tree(): array {
    $scriptsDir = SCRIPTS_DIR;
    $schedule   = vv_schedule_load();

    // Orchestrators are in Orchestrators/ and their children are all scripts they call
    // For now: walk top-level folders, treat *_management.sh or *_maintenance.sh as orchs
    $orchPattern = "$scriptsDir/Orchestrators/*.sh";
    $orchs = [];

    foreach (glob($orchPattern) ?: [] as $path) {
        $id       = 'Orchestrators/' . basename($path);
        $entry    = $schedule[$id] ?? ['enabled' => false, 'cron' => ''];
        $orchs[]  = [
            'id'       => $id,
            'label'    => basename($path, '.sh'),
            'type'     => 'orchestrator',
            'enabled'  => (bool)($entry['enabled'] ?? false),
            'cron'     => $entry['cron'] ?? '',
            'children' => vv_script_children($path, $schedule),
        ];
    }
    return $orchs;
}

// Parse an orchestrator script to find which child scripts it calls.
// Handles two common patterns:
//   $SCRIPT_DIR/../Category/script.sh  (relative via variable)
//   $SCRIPTS_ROOT/Category/script.sh   (absolute root via variable)
// Root-level files (load_config.sh, etc.) are excluded — must be in a subdirectory.
// Validates each candidate against the filesystem to filter false positives.
function vv_script_children(string $orchPath, array $schedule): array {
    $scriptsDir = SCRIPTS_DIR;
    $content    = file_get_contents($orchPath) ?: '';
    $children   = [];
    $seen       = [];

    // Match $ANY_VAR/../Category/script.sh  or  $ANY_VAR/Category/script.sh
    // Capture only the Category/script.sh portion (requires at least one subdirectory)
    preg_match_all(
        '/\$[A-Z_]+\/(?:\.\.\/)?([A-Za-z][A-Za-z0-9_.\-]*\/[A-Za-z0-9_.\-]+\.sh)/',
        $content,
        $m
    );

    foreach ($m[1] as $rel) {
        if (isset($seen[$rel])) continue;
        if (!file_exists("$scriptsDir/$rel")) continue;
        $seen[$rel] = true;

        $entry      = $schedule[$rel] ?? ['enabled' => false, 'cron' => ''];
        $children[] = [
            'id'      => $rel,
            'label'   => basename($rel, '.sh'),
            'type'    => 'script',
            'enabled' => (bool)($entry['enabled'] ?? false),
            'cron'    => $entry['cron'] ?? '',
        ];
    }
    return $children;
}