<?php

/**
 * Единая функция для заливки файлов на сервер.
 *
 * @version   1
 * @author    Ivor Barhansky <me@lopar.space>
 */

class Uploader
{
    private $width = ['min' => 0, 'max' => 0];
    private $height = ['min' => 0, 'max' => 0];
    private $maxFileSizeMb;
    private $savePath;
    private $extensions = 'jpg|png|jpeg|gif';
    private $extMatches = [];
    private $FILE;
    private $cnm = null;
    public static $error;

    public function __construct($name, $cnm = null)
    {
        $this->FILE = $_FILES;
        if (!$this->FILE[$name]) {
            return;
        }
        $this->cnm = $cnm;
    }

    /**
     * @param int $max
     * @param int $min
     * @return void
     */
    public function setWidth($max, $min = null)
    {
        $this->width['min'] = is_null($min) ? $max : $min;
        $this->width['max'] = $max;
    }

    /**
     * @param int $max
     * @param int $min
     * @return void
     */
    public function setHeight($max, $min = null)
    {
        $this->height['min'] = is_null($min) ? $max : $min;
        $this->height['max'] = $max;
    }

    /**
     * @param $megabytes
     * @return void
     */
    public function setMaxFileSize($megabytes)
    {
        $this->maxFileSizeMb = $megabytes * (1024 * 1024);
    }

    /**
     * @param string $path путь от корня до конечной папки без открывающего слеша.
     * @return void
     */
    public function setSavePath($path)
    {
        $this->savePath = __DIR__ . '/' . $path;
    }

    /**
     * @param string|array $ext
     * @return void
     */
    public function setExtentions($ext)
    {
        if (is_array($ext)) {
            $arr = $ext;
        } else {
            $arr[] = $ext;
        }
        if (!$arr) {
            return;
        }
        $this->extensions = implode('|', $arr);
    }

    /**
     * @param int $width
     * @param int $height
     * @return void
     */
    public function setDimensions($width, $height)
    {
        $this->setWidth($width);
        $this->setHeight($height);
    }

    private function hasNormalDimensions()
    {
        list($width, $height) = getimagesize($this->FILE['tmp_name']);
        if (
            $width < $this->width['min'] ||
            $width > $this->width['max'] ||
            $height < $this->height['min'] ||
            $height > $this->height['max']
        ) {
            self::$error = "Требования к размеру [{$this->width['max']}x{$this->height['max']}] не соблюдены.";
            if ($this->width['min'] !== $this->width['max'] || $this->height['min'] !== $this->height['max']) {
                self::$error .= " Минимум [{$this->width['min']}x{$this->height['min']}].";
            }
            self::$error .= " <span style='color:red;'>[{$width}x$height]</span>";
            return false;
        }
        return true;
    }

    private function hasNormalFileSize()
    {
        if (!$this->maxFileSizeMb) {
            $this->setMaxFileSize(2);
        }
        if ($this->FILE['size'] > $this->maxFileSizeMb || $this->FILE['size'] <=0) {
            self::$error = 'Неверный размер файла. Максимальный размер файла ' . $this->maxFileSizeMb . ' МБ';
            return false;
        }
        return true;
    }

    private function hasNormalType()
    {
        if (
            !preg_match('/\.(' . $this->extensions . ')$/i', $this->FILE['name'], $this->extMatches) ||
            !preg_match('/image/i', $this->FILE['type'])
        ) {
            self::$error = 'Неверный тип файла. Допустимые типы : ' . $this->extensions;
            return false;
        }
        return true;
    }

    private function hasNormalFilePath()
    {
        if (!$this->savePath || !is_dir($this->savePath)) {
            self::$error = 'Ошибка загрузки: нет такой папки.';
            return false;
        }
        return true;
    }

    private function upload()
    {
        $this->extMatches[1] = strtolower($this->extMatches[1]);
        $fn = uniqid('f_', true) . '.' . $this->extMatches[1];
        $fn2 = uniqid('f_', true) . '.gif';
        if ($this->cnm) {
            $fn = $this->cnm;
            $fn2 = $this->cnm;
        }
        if (!move_uploaded_file($this->FILE['tmp_name'], $this->savePath . $fn)) {
            self::$error = 'Ошибка загрузки файла';
            return false;
        }
        return [$fn2, $fn, $this->savePath . $fn];
    }

    function saveimg()
    {
        return $this->hasNormalFilePath() &&
        $this->hasNormalDimensions() &&
        $this->hasNormalFileSize() &&
        $this->hasNormalType() ? $this->upload() : false;
    }
}