<?php

    /**
     * Classe BackupFile 
     * 
     * A classe realiza a copia dos arquivos selecionados para uma pasta descrita 
     * e monta uma compactacao.
     *
     * @author Lucas Awade
     * @version 1.0.0
     * @date 28/01/2020
     */
    class BackupFile extends Backup {

        /** @directory */
        private $dir;
        private $folder;

        /** @folderBackup */
        private $name;

        /** @files */
        private $files = array();
        private $compact;
        private $formats = array();

        const CONF_DIR_TEMP_FOLDER = "/tmp";

        /**
         * $dir = Diretorio onde armazena os arquivos para serem feito o backup;
         * $name = Nome do backup para ser gerado;
         * 
         * @param string $dir
         * @param string $name
         */
        function __construct($dir, $name) {
            $this->dir = $this->strslash($dir);
            $this->name = $name;
            $this->setFolder($name);
        }

        /**
         * Gera os arquivos na pasta de backup
         */
        public function generate() {
            $this->log()->debug("Criando arquivo de Backup!", debug_backtrace());
            try {
                $this->create_folder();
                $this->copy_to_folder();
                foreach ($this->formats as $format) {
                    $this->$format();
                }
                return true;
            } catch (Exception $ex) {
                $this->log()->error("Erro ao criar os arquivos de backup! " . $ex->getMessage(), debug_backtrace());
                return false;
            }
        }
        
        ########################################################################
        ########                    FORMAT COMPACT                     ########
        ########################################################################

        /**
         * Formato de compactacao em tar.gz
         */
        public function targz() {
            $this->formats["targz"] = 'compact_targz';
        }

        ########################################################################
        ########                    IMPORTANT UTIL                      ########
        ########################################################################

        /**
         * Lista dos arquivos que serao feitos o backup 
         * @param string $file
         * @param string $rename
         */
        public function setFiles($file, $rename = null) {
            if ($rename) {
                $this->files[$rename] = $file;
            } else {
                $this->files[] = $file;
            }
        }
        
        /**
         * Completa o nome da pasta de backup
         * @param string $name
         */
        private function setFolder($name) {
            $this->folder = $this->strslash(self::CONF_DIR_TEMP_FOLDER) . $this->strslash($name);
        }

        /**
         * Nome do arquivo a ser compactado e seu formato
         * @param string $file
         * @return string
         */
        private function compact($file) {
            $this->compact = $file;
            return $this->compact;
        }

        ########################################################################
        ########                    FUNCTIONS CLASS                     ########
        ########################################################################

        /**
         * Cria a pasta para adicionar os arquivos de backup
         * @throws Exception
         */
        private function create_folder() {
            $this->log()->debug("### Criando Pasta ###", debug_backtrace());
            if (mkdir($this->folder)) {
                $this->log()->debug("Diretorio criado com sucesso!");
            } else {
                $this->log()->error("Nao foi possivel criar diretorio!");
                throw new Exception($this->log()->getText());
            }
        }

        /**
         * Copia os arquivos de backup para a pasta
         * @throws Exception
         */
        private function copy_to_folder() {
            $this->log()->debug("### Copiando Arquivos Pasta ###", debug_backtrace());
            if (!file_exists($this->dir)) {
                $this->log()->error("Nome da pasta informda nao encontrada!");
                throw new Exception($this->log()->getText());
            }

            if (!$this->files) {
                $this->log()->error("Nenhum arquivo selecionado para realizar o backup!");
                throw new Exception($this->log()->getText());
            }

            $this->log()->debug("Pasta de Backup " . $this->folder);

            foreach ($this->files as $rename => $file) {
                $this->log()->debug("Pasta: " . $this->folder);
                if (!file_exists($this->dir . $file)) {
                    $this->log()->error($file . " nao encontrado!");
                } else {
                    shell_exec("/bin/cp -Rap {$this->dir}{$file} {$this->folder}" . (!is_numeric($rename) ? $rename : ''));
                }
            }
            
            if (filesize($this->folder) < 5) {
                unlink($this->folder);
                $this->log()->error("Arquivo de backup foi criado vazio! Excluido..");
                throw new Exception($this->log()->getText());
            }
            $this->log()->debug("Finalizado a copia dos arquivos!");
        }

        /**
         * Compacta a pasta em formato tar.gz
         * @throws Exception
         */
        private function compact_targz() {
            $this->log()->debug("### Compactando Pasta ###", debug_backtrace());
            if (file_exists($this->folder)) {
                $targz = $this->strslash(self::CONF_DIR_TEMP_FOLDER) . "{$this->name}.tar.gz";
                shell_exec("tar -czf " . $this->compact($targz) . " -C " . $this->strslash(self::CONF_DIR_TEMP_FOLDER) . " " . $this->name);
                shell_exec("/bin/rm -Rf {$this->folder}");
            } else {
                $this->log()->error("Pasta nao encontrada para a compactacao!");
                throw new Exception($this->log()->getText());
            }
            $this->log()->debug("Finalizacao da compactacao do arquivo!");
        }
        
        /**
         * Remove o arquivo compactado do servidor
         * @return boolean
         */
        public function remove_compact() {
            $this->log()->debug("Remove Arquivo Compactado", debug_backtrace());
            shell_exec("/bin/rm -Rf {$this->compact}");
            if (!file_exists($this->compact)) {
                $this->log()->success("Arquivo compactado removido!");
                return true;
            } else {
                $this->log()->error("Nao foi possivel remover arquivo compactado!");
                return false;
            }
        }

    }