<?php

namespace rosavox\helpers;


/**
 */
class cache_state
{
	public static array $pool = [];
}


/**
 */
function cache_get(string $key, \Closure $retrieve)
{
	if (\array_key_exists($key, cache_state::$pool))
	{
		$value = cache_state::$pool[$key];
	}
	else
	{
		$value = ($retrieve)();
		cache_state::$pool[$key] = $value;
	}
	return $value;
}


/**
 */
function database_map_type(string $type)
{
	switch ($type)
	{
		case 'integer': return \SQLITE3_INTEGER;
		case 'string': return \SQLITE3_TEXT;
		default: throw (new \Exception(\sprintf('unhandled type: %s', $type)));
	}
}


/**
 */
function database_get(string $query_template, array $arguments) : array
{
	$connection = new \SQLite3('data.sqlite');
	$rows = $connection->query($query_template);
	/*
$query = "SELECT * FROM books";
$result = $db->query($query);

while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
	 */
}


/**
 */
function database_put(string $query_template, array $arguments) : int
{
	$connection = new \SQLite3('data.sqlite');
	$statement = $connection->prepare($query);
	foreach ($arguments as $key => $value)
	{
		$statement->bindValue(
			\sprintf(':%s', $key),
			$value['value'],
			database_map_type($value['type'])
		);
	}
	if ($statement->execute()) {
		// SELECT last_insert_rowid()
		echo "Buch erfolgreich hinzugefügt!";
	}
	else
	{
		echo "Fehler beim Hinzufügen des Buches: " . $db->lastErrorMsg();
	}
}


/**
 */
function string_coin(string $template, array $arguments) : string
{
	$result = $template;
	foreach ($arguments as $key => $value)
	{
		$result = \str_replace(\sprintf('{{%s}}', $key), $value, $result);
	}
	return $result;
}


/**
 */
class class_crud_jsonfile
{
	private string $path;
	
	private \Closure $id_encode;
	
	private \Closure $id_decode;
	
	public function __construct(
		string $path,
		\Closure $id_encode,
		\Closure $id_decode
	)
	{
		$this->path = $path;
		$this->id_encode = $id_encode;
		$this->id_decode = $id_decode;
	}
	
	private function get() : array
	{
		$content = (\file_exists($this->path) ? \file_get_contents($this->path) : null);
		return (
			($content === null)
			?
			['last_id' => 0, 'entries' => []]
			:
			\json_decode($content, true)
		);
	}
	
	private function put(array $data) : void
	{
		$content = \json_encode($data, \JSON_PRETTY_PRINT);
		\file_put_contents($this->path, $content);
	}
	
	public function list_() : array
	{
		$data = $this->get();
		return \array_map(
			fn ($id_encoded) => [
				'id' => ($this->id_decode)($id_encoded),
				'value' => $data['entries'][$id_encoded],
			],
			\array_keys($data['entries'])
		);
	}
	
	public function read(int $id)
	{
		$data = $this->get();
		$id_encoded = ($this->id_encode)($id);
		if (! \array_key_exists($id_encoded, $data['entries']))
		{
			throw (new \Exception('not found'));
		}
		else
		{
			return $data['entries'][$id_encoded];
		}
	}
	
	public function create($value) : int
	{
		$data = $this->get();
		$id = ($data['last_id'] + 1);
		$id_encoded = ($this->id_encode)($id);
		$data['last_id'] = $id;
		$data['entries'][$id_encoded] = $value;
		$this->put($data);
		return $id;
	}

	public function update(int $id, $value) : void
	{
		$data = $this->get();
		$id_encoded = ($this->id_encode)($id);
		if (! \array_key_exists($id_encoded, $data['entries']))
		{
			throw (new \Exception('not found'));
		}
		else
		{
			$data['entries'][$id_encoded] = $value;
			$this->put($data);
		}
	}

	public function delete(int $id) : void
	{
		$data = $this->get();
		$id_encoded = ($this->id_encode)($id);
		if (! \array_key_exists($id_encoded, $data['entries']))
		{
			throw (new \Exception('not found'));
		}
		else
		{
			unset($data['entries'][$id_encoded]);
			$this->put($data);
		}
	}
}


/**
 */
function render(string $template_name, array $arguments) : string
{
	return string_coin(
		cache_get(
			string_coin(
				'template.{{name}}',
				[
					'name' => $template_name,
				]
			),
			fn() => \file_get_contents(
				string_coin(
					'{{directory}}/templates/{{name}}.html.tpl',
					[
						'directory' => __DIR__,
						'name' => $template_name,
					]
				)
			)
		),
		$arguments
	);
}


/**
 */
function navigate(string $target) : void
{
	\header('Location: ' . $target);
}


 ?>