<?php

require('../model/Response.php');
require('../model/JsonReader.php');
require('../model/TsvTransformer.php');

const CITIES_PATH = '../cities.json';
const TSV_FILE = '../Polskie-miasta.tsv';

if(isset($_GET)) {
    if(!file_exists(CITIES_PATH)) {
        $transformer = new TsvTransformer();
        $transformer->transform('../Polskie-miasta.tsv');
    }

    $reader = new JsonReader();
    $json = $reader->readFromFile(CITIES_PATH);

    if(!isset($_GET['search_query'])) {
        echo json_encode(new Response(false, 'Missing required parameter \'search_query\''));
        die;
    }

    $searchPhrase = htmlspecialchars($_GET['search_query']);

    if(strlen($searchPhrase) == 0) {
        echo json_encode(new Response(false, 'Search query parameter cannot be empty'));
        die;
    }

    $pattern = '/' . $searchPhrase . '/i';
    $result = array_values(array_filter($json, function($element) use ($pattern) {
        if(preg_match($pattern, $element['city'])) {
            return true;
        }

        return false;
    }));

    if(count($result) > 20) {
        $bonusResults = count($result) - 20;
        $result = array_slice($result, 0, 20);
    } else {
        $bonusResults = 0;
    }
    echo json_encode(new Response(true, ['cities' => $result, 'restResults' => $bonusResults]));
} else {
    echo json_encode(new Response(false, 'Unsupported method, this api only supports method GET'));
    die;
}