<?php

namespace SparkPlug\Com\Noccy\Watcher\Monitor;

use SparkPlug\Com\Noccy\Watcher\Rule;

class MtimeMonitor implements MonitorInterface
{
    private array $rules = [];

    private array $watched = [];

    private array $modified = [];

    /**
     * {@inheritDoc}
     */
    public function add(Rule $rule)
    {
        $this->rules[] = $rule;
    }

    /**
     * {@inheritDoc}
     */
    public function getModified(): array
    {
        $mod = $this->modified;
        $this->modified = [];
        return $mod;
    }

    /**
     * {@inheritDoc}
     */
    public function getWatched(): array
    {
        return [];        
    }

    public function loop()
    {
        foreach ($this->rules as $rule) {
            $this->checkRule($rule);
        }
    }

    private function checkRule(Rule $rule)
    {
        clearstatcache();

        $paths = $rule->getWatchedFiles();
        $check = [];
        foreach ($paths as $path) {
            if (str_contains($path, '*')) {
                $check = array_merge($check, glob($path));
            } else {
                $check[] = $path;
            }
        }

        foreach ($check as $path) {
            if (empty($this->watched[$path])) {
                $this->watched[$path] = filemtime($path);
            } else {
                $mtime = filemtime($path);
                if ($mtime > $this->watched[$path]) {
                    printf("* modified: %s (%s)\n", $path, $rule->getName());
                    $this->watched[$path] = $mtime;
                    if (!in_array($rule, $this->modified)) {
                        $this->modified[] = $rule;
                    }
                }
            }
        }
    }
}