<?php

namespace rosavox\helpers\storage;

/**
 */
interface interface_
{
	public function list_() : array;
	
	public function read(int $id);
	
	public function create($value) : int;
	
	public function update(int $id, $value) : void;
	
	public function delete(int $id) : void;
}


/**
 */
class class_jsonfile implements interface_
{
	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);
		}
	}
}

 ?>