<?php

declare(strict_types=1);

namespace Kiri\Di;

class ScanManifest
{
	private array $entries = [];


	/**
	 * @param string $path
	 * @param int    $mtime
	 * @param array  $classes
	 * @return void
	 */
	public function set(string $path, int $mtime, array $classes): void
	{
		$this->entries[$path] = [
			'mtime' => $mtime,
			'classes' => array_values(array_unique($classes)),
		];
	}


	/**
	 * @param string $path
	 * @return bool
	 */
	public function has(string $path): bool
	{
		return isset($this->entries[$path]);
	}


	/**
	 * @param string $path
	 * @return int|null
	 */
	public function getMtime(string $path): ?int
	{
		return $this->entries[$path]['mtime'] ?? null;
	}


	/**
	 * @param string $path
	 * @return array
	 */
	public function getClasses(string $path): array
	{
		return $this->entries[$path]['classes'] ?? [];
	}


	/**
	 * @param string $path
	 * @return array
	 */
	public function remove(string $path): array
	{
		$classes = $this->getClasses($path);
		unset($this->entries[$path]);
		return $classes;
	}


	/**
	 * @return array
	 */
	public function all(): array
	{
		return $this->entries;
	}


	/**
	 * @param string|null $prefix
	 * @return array
	 */
	public function paths(?string $prefix = null): array
	{
		if ($prefix === null) {
			return array_keys($this->entries);
		}

		return $this->entries
		       |> array_keys(...)
		       |> (fn($x) => array_filter($x, fn(string $path) => str_starts_with($path, $prefix)))
		       |> array_values(...);
	}


	/**
	 * @param array $entries
	 * @return void
	 */
	public function fromArray(array $entries): void
	{
		$this->entries = [];
		foreach ($entries as $path => $entry) {
			$mtime = (int)($entry['mtime'] ?? 0);
			$classes = is_array($entry['classes'] ?? null) ? $entry['classes'] : [];
			$this->set($path, $mtime, $classes);
		}
	}
}