<?php
namespace ProVM\Common\Service;

use Ddeboer\Imap\Message\AttachmentInterface;
use Ddeboer\Imap\MessageInterface;
use ProVM\Emails\Model\Attachment;
use ProVM\Emails\Model\Message;

class Attachments
{
    public function __construct(Decrypt $decrypt, \ProVM\Emails\Repository\Attachment $repository, string $attachments_folder)
    {
        $this->setDecrypt($decrypt);
        $this->setAttachmentsFolder($attachments_folder);
    }

    protected string $attachments_folder;
    protected Decrypt $decrypt;
    protected \ProVM\Emails\Repository\Attachment $repository;

    public function getAttachmentsFolder(): string
    {
        return $this->attachments_folder;
    }
    public function getDecrypt(): Decrypt
    {
        return $this->decrypt;
    }
    public function getRepository(): \ProVM\Emails\Repository\Attachment
    {
        return $this->repository;
    }

    public function setAttachmentsFolder(string $folder): Attachments
    {
        $this->attachments_folder = $folder;
        return $this;
    }
    public function setDecrypt(Decrypt $decrypt): Attachments
    {
        $this->decrypt = $decrypt;
        return $this;
    }
    public function setRepository(\ProVM\Emails\Repository\Attachment $repository): Attachments
    {
        $this->repository = $repository;
        return $this;
    }

    public function validateAttachment(AttachmentInterface $remote_attachment): bool
    {
        return str_contains($remote_attachment->getFilename(), '.pdf');
    }

    public function buildAttachment(Message $message, AttachmentInterface $remote_attachment): Attachment
    {
        $data = [
            'message_id' => $message->getId(),
            'filename' => $this->buildFilename($message, $remote_attachment)
        ];
        return $this->getRepository()->create($data);
    }

    public function exists(Attachment $attachment): bool
    {
        $filename = $this->buildFilename($attachment);
        return file_exists($filename);
    }

    public function buildFilename(Message $message, AttachmentInterface $attachment): string
    {
        $filename = implode(' - ', [
            $message->getSubject(),
            $message->getDateTime()->format('Y-m-d'),
            $attachment->getFilename()
        ]);
        return implode(DIRECTORY_SEPARATOR, [
            $this->getAttachmentsFolder(),
            $filename
        ]);
    }

    public function checkEncrypted(): array
    {
        $output = [];
        foreach ($this->fetchAttachments() as $attachment) {
            $output[$attachment->getFilename()] = $this->getDecrypt()->isEncrypted($attachment->getRealPath());
        }
        return $output;
    }

    public function fetchAttachments(): array
    {
        $files = new \FilesystemIterator($this->getAttachmentsFolder());
        $attachments = [];
        foreach ($files as $file) {
            if ($file->isDir()) {
                continue;
            }
            $attachments []= $file;
        }
        return $attachments;
    }
    public function fetchDecryptedAttachments(): array
    {
        $folder = implode(DIRECTORY_SEPARATOR, [$this->getAttachmentsFolder(), 'decrypted']);
        $files = new \FilesystemIterator($folder);
        $attachments = [];
        foreach ($files as $file) {
            if ($file->isDir()) {
                continue;
            }
            $attachments []= $file;
        }
        return $attachments;
    }
    public function fetchFullAttachments(): array
    {
        $attachments = $this->fetchAttachments();
        $output = [];
        foreach ($attachments as $attachment) {
            $att = [
                'original_attachment' => $attachment,
                'encrypted' => $this->getDecrypt()->isEncrypted($attachment->getRealPath())
            ];
            if ($att['encrypted']) {
                $att['decrypted_attachment'] = $this->getDecryptedAttachment($attachment);
            }
            $output []= $att;
        }
        return $output;
    }

    public function getAttachment(string $filename): \SplFileInfo
    {
        if (!str_contains($filename, $this->getAttachmentsFolder())) {
            $filename = implode(DIRECTORY_SEPARATOR, [$this->getAttachmentsFolder(), $filename]);
        }
        return new \SplFileInfo($filename);
    }
    public function getDecryptedAttachment(\SplFileInfo $info): \SplFileInfo|bool
    {
        $new_file = implode(DIRECTORY_SEPARATOR, [$info->getPath(), 'decrypted', $info->getFilename()]);
        if (!file_exists($new_file)) {
            return false;
        }
        return new \SplFileInfo($new_file);
    }

    public function removeEncryption(string $filename): \SplFileInfo
    {
        $attachment = $this->getAttachment($filename);
        $new_file = implode(DIRECTORY_SEPARATOR, [$attachment->getPath(), 'decrypted', $attachment->getFilename()]);
        if ($this->getDecrypt()->runCommand($attachment->getRealPath(), $new_file)) {
            return new \SplFileInfo($new_file);
        }
        return $attachment;
    }
}