<?php

namespace rosavox\logic;

require_once(__DIR__ . '/helpers.php');


/**
 */
class docs_state
{
	public static int $current_id = 0;
	
	/**
	 * @param array {record<string,array>}
	 */
	public static array $pool = [];
}


/**
 */
function docs_push() : void
{
	$path = 'docs.json';
	$data = [
		'current_id' => docs_state::$current_id,
		'pool' => docs_state::$pool,
	];
	$content = \json_encode($data, \JSON_PRETTY_PRINT);
	\file_put_contents($path, $content);
}


/**
 */
function docs_pull() : void
{
	$path = 'docs.json';
	$content = (\file_exists($path) ? \file_get_contents($path) : null);
	$data = (
		($content === null)
		?
		['current_id' => 0, 'pool' => []]
		:
		\json_decode($content, true)
	);
	docs_state::$current_id = $data['current_id'];
	docs_state::$pool = $data['pool'];
}


/**
 */
function docs_id_encode(int $id) : string
{
	return \sprintf('%u', $id);
}


/**
 */
function docs_id_decode(string $id_encoded) : int
{
	return intval($id_encoded);
}


/**
 */
function docs_list() : array
{
	return \array_map(
		fn ($id_encoded) => [
			'id' => docs_id_decode($id_encoded),
			'doc' => docs_state::$pool[$id_encoded],
		],
		\array_keys(docs_state::$pool)
	);
}


/**
 */
function docs_read(int $id) : array
{
	$id_encoded = docs_id_encode($id);
	if (! \array_key_exists($id_encoded, docs_state::$pool))
	{
		throw (new \Exception('not found'));
	}
	else
	{
		return docs_state::$pool[$id_encoded];
	}
}


/**
 */
function docs_create(array $doc) : int
{
	docs_state::$current_id += 1;
	$id = docs_state::$current_id;
	$id_encoded = docs_id_encode($id);
	docs_state::$pool[$id_encoded] = $doc;
	docs_push();
	return $id;
}


/**
 */
function docs_update(int $id, array $doc) : void
{
	$id_encoded = docs_id_encode($id);
	if (! \array_key_exists($id_encoded, docs_state::$pool))
	{
		throw (new \Exception('not found'));
	}
	else
	{
		docs_state::$pool[$id_encoded] = $doc;
		docs_push();
	}
}


/**
 */
function docs_delete(int $id) : void
{
	$id_encoded = docs_id_encode($id);
	if (! \array_key_exists($id_encoded, docs_state::$pool))
	{
		throw (new \Exception('not found'));
	}
	else
	{
		docs_state::$pool[$id_encoded] = null;
		unset(docs_state::$pool[$id_encoded]);
		docs_push();
	}
}


/**
 */
function docs_init() : void
{
	docs_pull();
}


/**
 */
function docs_add_examples() : void
{
	docs_create(
		[
			'title' => 'Freibier bei Parteitagen',
			'authors' => [
				'Björn Biernot',
				'Doreen Dauerdurst',
			],
			'content' => 'Wir haben Durst!',
			'reasoning' => null,
		]
	);
}

 ?>