<?php

namespace App\Service;

use App\Service\StaticSiteBuilder;

class StaticSiteBackupConfig
{
    public static string $backupPath = '/var/www/cds/backups/';

    //date format used for generating folder names
    public static string $dateFormat = 'Y-m-d_H-i-s';

    //delete backups older than this
    public static int $retentionPeriod = 14; 
}

class StaticSiteBackupResult
{
    public string $criticalError = ''; //any error that causes early exit of routine

    public string $backupPath = '';

    public string $backupPathTemplates = '';

    public string $backupPathPublic = '';

    public string $backupPathVar = '';

    public int $totalTemplateFiles = 0;

    public int $totalTemplateFilesCopied = 0;

    public int $totalTemplateFilesFailed = 0;

    public function toArray() : array
    {
        return [
            'criticalError' => $this->criticalError,
            'backupPath' => $this->backupPath,
            'backupPathTemplates' => $this->backupPathTemplates,
            'backupPathPublic' => $this->backupPathPublic,
            'backupPathVar' => $this->backupPathVar,
            'totalTemplateFiles' => $this->totalTemplateFiles,
            'totalTemplateFilesCopied' => $this->totalTemplateFilesCopied,
            'totalTemplateFilesFailed' => $this->totalTemplateFilesFailed
        ];        
    }
}

class StaticSiteBackupManager
{
    public string $projectDir;

    public StaticSiteBuilder $staticSiteBuilder;

    public string $backupPath;

    public string $dateFormat;

    public int $retentionPeriod;

    public function __construct(
        string $projectDir,
        StaticSiteBuilder $staticSiteBuilder
    )
    {
        $this->projectDir = $projectDir;

        $this->staticSiteBuilder = $staticSiteBuilder;

        $this->backupPath = StaticSiteBackupConfig::$backupPath;

        $this->dateFormat = StaticSiteBackupConfig::$dateFormat;

        $this->retentionPeriod = StaticSiteBackupConfig::$retentionPeriod;
    }

    public function deleteOld() : void
    {
        $thresholdDate = date($this->dateFormat, time() - ($this->retentionPeriod * 86400));

        foreach (glob($this->backupPath . '*') as $filename) {
            $pathinfo = pathinfo($filename);

            if (is_dir($filename) && $pathinfo['basename'] < $thresholdDate) {
                $output = @shell_exec('rm -rf ' . $filename); 
            }
        } 
    }

    public function restore(string $folderName) : bool
    {
        if (is_dir($this->backupPath . $folderName)) {
            //templates
            $dir1 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticTemplatePath . '*';
            $dir2 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticTemplatePath;

            //echo 'cp -rp ' . $dir1 . ' ' . $dir2 . PHP_EOL;

            $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2); 

            //public
            $dir1 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticMediaPath . '*';
            $dir2 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticMediaPath;

            //echo 'cp -rp ' . $dir1 . ' ' . $dir2 . PHP_EOL;

            $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2);

            //var
            $dir1 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticVarPath . '*';
            $dir2 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticVarPath;

            //echo 'cp -rp ' . $dir1 . ' ' . $dir2 . PHP_EOL;

            $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2);

            return true;
        }

        return false;
    }

    public function run() : StaticSiteBackupResult
    {
        $staticSiteBackupResult = new StaticSiteBackupResult();

        if ($this->staticSiteBuilder->isRunning()) {
            $staticSiteBackupResult->criticalError = 'STATIC SITE BUILDER IS RUNNING, TRY AGAIN SHORTLY';

            return $staticSiteBackupResult;
        }

        //is path writable
        if (!is_writable($this->backupPath)) {
            $staticSiteBackupResult->criticalError = 'Backup location is not writable';

            return $staticSiteBackupResult;
        }

        //get date, use a backup folder name
        $folderName = date($this->dateFormat);

        @mkdir($this->backupPath . $folderName, 755);
        @mkdir($this->backupPath . $folderName . $this->staticSiteBuilder->staticTemplatePath, 0777, true);
        @mkdir($this->backupPath . $folderName . $this->staticSiteBuilder->staticMediaPath, 0755, true);
        @mkdir($this->backupPath . $folderName . $this->staticSiteBuilder->staticVarPath, 0755, true);

        if (!is_dir($this->backupPath . $folderName)) {
            $staticSiteBackupResult->criticalError = 'Could not create backup directory';

            return $staticSiteBackupResult;
        }

        if (!is_dir($this->backupPath . $folderName . $this->staticSiteBuilder->staticTemplatePath )) {
            $staticSiteBackupResult->criticalError = 'Could not create template directory';

            return $staticSiteBackupResult;
        }

        if (!is_dir($this->backupPath . $folderName . $this->staticSiteBuilder->staticMediaPath )) {
            $staticSiteBackupResult->criticalError = 'Could not create public directory';

            return $staticSiteBackupResult;
        }

        if (!is_dir($this->backupPath . $folderName . $this->staticSiteBuilder->staticVarPath )) {
            $staticSiteBackupResult->criticalError = 'Could not create var directory';

            return $staticSiteBackupResult;
        }

        $staticSiteBackupResult->backupPath = $this->backupPath . $folderName;

        //templates
        $dir1 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticTemplatePath . '*';
        $dir2 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticTemplatePath;

        $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2); 

        $staticSiteBackupResult->backupPathTemplates = $this->backupPath . $folderName . $this->staticSiteBuilder->staticTemplatePath;

        //public
        $dir1 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticMediaPath . '*';
        $dir2 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticMediaPath;

        $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2);

        $staticSiteBackupResult->backupPathPublic = $this->backupPath . $folderName . $this->staticSiteBuilder->staticMediaPath;

        //var
        $dir1 = $this->staticSiteBuilder->projectDir . $this->staticSiteBuilder->staticVarPath . '*';
        $dir2 = $this->backupPath . $folderName . $this->staticSiteBuilder->staticVarPath;

        $output = @shell_exec('cp -rp ' . $dir1 . ' ' . $dir2);

        $staticSiteBackupResult->backupPathVar = $this->backupPath . $folderName . $this->staticSiteBuilder->staticVarPath;


        return $staticSiteBackupResult;
    }
}