<?php

use Symfony\Component\HttpFoundation\Response;

class Model {
  protected $data = [];
  protected $path;

  public function __construct(string $path) {
    $this->path = $path;
  }

  /**
   * Flush the in-memory storage to disk. Do not load it first.
   */
  protected function store() {
    $raw = json_encode($this->data, JSON_PRETTY_PRINT);
    file_put_contents($this->path, $raw);
  }

  public function load() {
    $raw = file_get_contents($this->path);
    $this->data = json_decode($raw, true);
    return $this->data;
  }

  public function save(array $doc) {
    $this->load();
    if (empty($doc['id'])) {
      $id = (int) max(array_keys($this->data)) + 1;
      $doc['id'] = $id;
      $created = true;
    }
    else {
      $id = (int) $doc['id'];
      $created = false;
    }

    $this->data[$id] = $doc;
    $this->store();
    return $created;
  }

  public function delete(int $id) {
    $this->load();
    if (!isset($this->data[$id])) {
      return FALSE;
    }
    unset($this->data[$id]);
    $this->store();
    return TRUE;
  }
}