<?php
error_reporting(-1);
$base_width = 720;
$fonts = [
    "name" => 33,
    "score" => 62,
    "result" => 24,
    "title" => 33,
    "base" => 16
];
$params = $_GET['q'] ?? 'default';
$params = explode(';', base64_decode($params));
$image = imagecreatefromjpeg('group.jpg');
$date = date('d.m.Y');
$points_text = [
    "lv" => "Punkti",
    "ru" => "Пункты",
    "en" => "Points"
];
$title_1_text = [
    "lv" => "Augšup, lejup!",
    "ru" => "Augšup, lejup!",
    "en" => "Up, down!"
];
$title_2_text = [
    "lv" => "Kas nosaka valūtas kursu?",
    "ru" => "Kas nosaka valūtas kursu?",
    "en" => "What determines the exchange rate?"
];
$base_color = imagecolorallocate($image, 6, 0, 95);
$base_color_lighter = imagecolorallocate($image, 137, 138, 183);
$white_color = imagecolorallocate($image, 255, 255, 255);
$fontBold = realpath('TahomaBold.ttf');
$fontRegular = realpath('TahomaRegular.ttf');
$name_params = calculateTextBox($params[0], $fontBold, $fonts["name"], 0);
$score_params = calculateTextBox($params[1], $fontBold, $fonts["score"], 0);
$result_params = calculateTextBox($params[2], $fontBold, $fonts["result"], 0);
$title_1_params = calculateTextBox($title_1_text[$params[3]], $fontBold, $fonts["title"], 0);
$title_2_params = calculateTextBox($title_2_text[$params[3]], $fontBold, $fonts["result"], 0);
$date_params = calculateTextBox($date, $fontRegular, $fonts["base"], 0);
$points_params = calculateTextBox($points_text[$params[3]], $fontRegular, $fonts["base"], 0);
$coordinates = [
    "name" => [
        "x" => ($base_width - $name_params["width"])/2,
        "y" =>  503 + $name_params["height"]
    ],
    "score" => [
        "x" => ($base_width - $score_params["width"])/2,
        "y" =>  280 + $score_params["height"]
    ],
    "result" => [
        "x" => ($base_width - $result_params["width"])/2,
        "y" =>  392 + $result_params["height"]
    ],
    "date" => [
        "x" => ($base_width - $date_params["width"])/2,
        "y" =>  585 + $date_params["height"]
    ],
    "title_1" => [
        "x" => ($base_width - $title_1_params["width"])/2,
        "y" =>  45 + $title_1_params["height"]
    ],
    "title_2" => [
        "x" => ($base_width - $title_2_params["width"])/2,
        "y" =>  45 + $title_1_params["height"] + $title_2_params["height"] + 20
    ],
    "points" => [
        "x" => ($base_width - $points_params["width"])/2,
        "y" =>  355 + $points_params["height"]
    ],
];
// splitting name into parts
$spacer = 300; // sum of equal spaces that has to be left from both sides
if ($name_params["width"] + $spacer > $base_width) {
    $str_arr = explode(" ", $params[0]);
    $str = "";
    $str_output = 1;
    foreach ($str_arr as $key => $name_part) {
        $str_params = calculateTextBox($str, $fontBold, 24, 0);
        $name_part_params = calculateTextBox($name_part, $fontBold, 24, 0);
        if ($str_params["width"] + $name_part_params["width"] + $spacer < $base_width) {
            $str .= $name_part . ' ';
        } else {
            imagettftext ($image, 24,0, ($base_width - $str_params["width"])/2, 503 + $str_params["height"] * $str_output, $white_color, $fontBold , $str);
            $str = $name_part . ' ';
            $str_output++;
        }
    }
    $str_params = calculateTextBox($str, $fontBold, 24, 0);
    imagettftext ($image, 24,0, ($base_width - $str_params["width"])/2, 508 + $str_params["height"] * $str_output, $white_color, $fontBold , $str);
} else {
    imagettftext ($image, $fonts["name"],0, $coordinates['name']['x'], $coordinates['name']['y'], $white_color, $fontBold , $params[0]);
}
imagettftext ($image, $fonts["score"],0, $coordinates['score']['x'], $coordinates['score']['y'], $base_color, $fontBold , $params[1]);
imagettftext ($image, $fonts["result"],0, $coordinates['result']['x'], $coordinates['result']['y'], $base_color, $fontBold , $params[2]);
imagettftext ($image, $fonts["title"],0, $coordinates['title_1']['x'], $coordinates['title_1']['y'], $white_color, $fontBold , $title_1_text[$params[3]]);
imagettftext ($image, $fonts["result"],0, $coordinates['title_2']['x'], $coordinates['title_2']['y'], $white_color, $fontBold , $title_2_text[$params[3]]);
imagettftext ($image, $fonts["base"],0, $coordinates['date']['x'], $coordinates['date']['y'], $base_color_lighter, $fontRegular , $date);
imagettftext ($image, $fonts["base"],0, $coordinates['points']['x'], $coordinates['points']['y'], $base_color, $fontRegular , $points_text[$params[3]]);
header("Content-type: image/jpeg");
return imagejpeg($image);

function calculateTextBox($text,$fontFile,$fontSize,$fontAngle) {
    /************
    simple function that calculates the *exact* bounding box (single pixel precision).
    The function returns an associative array with these keys:
    left, top:  coordinates you will pass to imagettftext
    width, height: dimension of the image you have to create
     *************/
    $rect = imagettfbbox($fontSize,$fontAngle,$fontFile,$text);
    $minX = min(array($rect[0],$rect[2],$rect[4],$rect[6]));
    $maxX = max(array($rect[0],$rect[2],$rect[4],$rect[6]));
    $minY = min(array($rect[1],$rect[3],$rect[5],$rect[7]));
    $maxY = max(array($rect[1],$rect[3],$rect[5],$rect[7]));

    return array(
        "left"   => abs($minX) - 1,
        "top"    => abs($minY) - 1,
        "width"  => $maxX - $minX,
        "height" => $maxY - $minY,
        "box"    => $rect
    );
}