<?php

namespace App\Ingest;

use Illuminate\Support\Facades\Storage;
use Symfony\Component\Process\Exception\ProcessFailedException;
use Symfony\Component\Process\Process;

class Convertor
{
    /**
     * @var \Illuminate\Contracts\Filesystem\Filesystem
     */
    private $storage;
    private $path;
    protected $type;

    public function __construct($path, $type)
    {
        $this->storage = Storage::disk('local');
        $this->path = $path;
        $this->type = $type;
    }

    public function execute()
    {
        if ($this->type === 'txt') {
            return $this->path;
        }

        if ($this->type === 'pdf') {
            $this->convertPdfToText();

            return $this->path;
        }

        if ($this->type !== 'docx') {
            $this->convertToDocx();
        }

        $this->convertDocumentToText();
        //$this->convertToHtml();

        return $this->path;
    }

    /**
     * Convert doc,dot,rtf,odt,pdf,docx to docx
     *
     *
     * @return string|void
     */
    private function convertToDocx()
    {
        (new Process(['export HOME=' . env('USER_HOME_PATH')]))->run();

        /**
         * Convert doc,dot,rtf,odt to docx
         */
        $process = new Process([
            'soffice',
            '--headless',
            '--convert-to',
            'docx',
            $this->storage->path($this->path),
            '--outdir',
            $this->storage->path('contracts')
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $this->storage->delete($this->path);

        $this->path = str_replace($this->type, 'docx', $this->path);
    }

    /**
     * Convert docx file to text
     *
     *
     * @return string|void
     */
    private function convertDocumentToText()
    {
        (new Process(['export HOME=' . env('USER_HOME_PATH')]))->run();

        $process = new Process([
            'soffice',
            '--headless',
            '--convert-to',
            'txt',
            $this->storage->path($this->path),
            '--outdir',
            $this->storage->path('contracts')
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $this->storage->delete($this->path);

        $this->path = str_replace(['.docx', '.bin'], '.txt', $this->path);
    }

    private function convertPdfToText()
    {
        (new Process(['export HOME=' . env('USER_HOME_PATH')]))->run();

        $process = new Process([
            'pip3',
            'install',
            'pdftotext',
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $process = new Process([
            'python3',
            storage_path('scripts' . DIRECTORY_SEPARATOR . 'parse-pdf.py'),
            '-i',
            $this->storage->path($this->path),
            '-o',
            $this->storage->path(str_replace('.pdf', '.txt', $this->path))
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $this->storage->delete($this->path);

        $this->path = str_replace('pdf', 'txt', $this->path);
    }

    private function convertToHtml()
    {
        (new Process(['export HOME=' . env('USER_HOME_PATH')]))->run();

        $process = new Process([
            'soffice',
            '--headless',
            '--convert-to',
            'html:HTML:EmbedImages',
            $this->storage->path($this->path),
            '--outdir',
            $this->storage->path('contracts')
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $this->storage->delete($this->path);

        $this->path = str_replace($this->type, 'html', $this->path);
    }

    private function convertToXML()
    {
        //Convert the file to xml using pdftohtml to xml and run a python scrypt to fix the paragraphs
        $process = new Process([
            'pdftohtml',
            '-xml',
            '-i',
            $this->storage->path($this->path)
        ]);

        $process->run();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        $this->storage->delete($this->path);

        $this->path = str_replace($this->type, 'xml', $this->path);
    }
}