<?php

namespace App\Jobs;

use App\Ingest\DocxConvertor;
use App\Ingest\DocxWriter;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Spatie\WebhookServer\WebhookCall;

class RecreateDocument implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    protected $id;
    protected $data;
    protected $storage;
    protected $path;
    protected $url;
    protected $secret;

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($id, $data)
    {
        $this->id = $id;
        $this->data = $data;
        $this->storage = Storage::disk('local');

        $this->path = '';

        $this->url = env('WEBHOOK_CORE_URL') . '/webhooks';
        $this->secret = env('WEBHOOK_CORE_SECRET');
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        try {
            $this->setupData();

            $this->createDocx();

            $this->convertToOriginalDocumentFormat();

            $this->sendResponse('success');
        } catch (\Exception $exception) {
            \Illuminate\Support\Facades\Log::info('RecreateDocument@handle: ' . $exception->getMessage());
            \Illuminate\Support\Facades\Log::info($exception->getTraceAsString());

            $this->sendResponse('fail');
        }
    }

    protected function setupData()
    {
        $text = $this->data['contents']['text'];
        $textMapper = [];

        foreach ($this->data['contents']['elements'] as $element) {
            $textMapper[$element['hash']] =substr(
                $text,
                $element['range_start'],
                $element['range_end'] - $element['range_start'] + 1
            );
        }

        $this->data['elements'] = $this->updateText($this->data['elements'], $textMapper)['elements'];
    }

    protected function updateText($elements, $textMapper, $parentElement = null)
    {
        $stoppedAtIndex = null;
        $collectionToAppend = [];

        for ($index = 0; $index < count($elements); $index++) {
            $element = $elements[$index];

            if (array_key_exists('hash', $element)) {
                $result = $this->processText($element, $textMapper);

                if ( ! $result['is_collection']) {
                    $elements[$index] = $result['element'];
                } else {
                    if ($parentElement && $parentElement['element_type'] === 'TextRun') {
                        $stoppedAtIndex = $index;
                        $collectionToAppend = $result['elements'];

                        break;
                    } else {
                        // We have a collection of elements instead of one, so we must push its siblings to make room.
                        $numberOfPlacesToMove = count($result['elements']) - 1;

                        // Move siblings to make room for collection.
                        for ($i = count($elements) - 1; $i > $index; $i--) {
                            $elements[$i + $numberOfPlacesToMove] = $elements[$i];
                        }

                        foreach ($result['elements'] as $i => $collectionElement) {
                            $elements[$index + $i] = $collectionElement;
                        }

                        $index += $numberOfPlacesToMove;
                    }
                }
            }

            if (
                array_key_exists('text_object', $element) &&
                array_key_exists('text', $element['text_object'])
            ) {
//                $elements[$index]['text_object']['text'] = $textMapper[$element['text_object']['hash']];
                $result = $this->processText($element['text_object'], $textMapper);

                if ( ! $result['is_collection']) {
                    $elements[$index]['text_object'] = $result['element'];
                } else {
//                    if ($parentElement && $parentElement['element_type'] === 'TextRun') {
//                        $stoppedAtIndex = $index;
//                        $collectionToAppend = $result['elements'];
//
//                        break;
//                    } else {
//                        // We have a collection of elements instead of one, so we must push its siblings to make room.
//                        $numberOfPlacesToMove = count($result['elements']) - 1;
//
//                        // Move siblings to make room for collection.
//                        for ($i = count($elements) - 1; $i > $index; $i--) {
//                            $elements[$i + $numberOfPlacesToMove] = $elements[$i];
//                        }
//
//                        foreach ($result['elements'] as $i => $element) {
//                            $elements[$index + $i] = $element;
//                        }
//
//                        $index += $numberOfPlacesToMove;
//                    }
                }
            }

            if (isset($elements[$index]['elements'])) {
                $result = $this->updateText($elements[$index]['elements'], $textMapper, $element);

                $elements[$index]['elements'] = $result['elements'];

                if ($result['has_stopped']) {
                    // One of the child has become a 'TextRun' and the current $element is also a 'TextRun'
                    // so the child will become a sibling of the $element.

                    // Start from the end of the array and move elements.
                    $numberOfPlacesToMove = count($result['collection_to_append']) + count($result['unprocessed_elements']);

                    for ($i = count($elements) - 1; $i > $index; $i--) {
                        $elements[$numberOfPlacesToMove + $i] = $elements[$i];
                    }

                    foreach ($result['collection_to_append'] as $i => $collectionElement) {
                        $elements[$index + 1 + $i] = $collectionElement;
                    }

                    // 4 5 6

                    $elements[$index + 1] = $result['text_run_element'];

                    foreach ($result['unprocessed_elements'] as $i => $unprocessedElement) {
                        $elements[$index + count($result['collection_to_append']) + $i] = $unprocessedElement;
                    }

                    // Skip 'text_run_element' processing.
                    $index += 1;
                }
            }
        }

        if ($stoppedAtIndex === null) {
            return [
                'has_stopped' => false,
                'elements' => $elements,
            ];
        }

        $remainingElements = array_splice($elements, 0, $stoppedAtIndex);
        $unprocessedElements = array_splice($elements, 1);

        return [
            'has_stopped' => true,
            'elements' => $remainingElements,
            'collection_to_append' => $collectionToAppend,
            'unprocessed_elements' => $unprocessedElements,
        ];
    }

    protected function processText($element, $textMapper)
    {
        $text = $textMapper[$element['hash']];

        if ($element['text'] === $text) {
            return [
                'is_collection' => false,
                'element' => $element,
            ];
        }

        $textWithDisplacement = $text;

        preg_match_all('/{[^\/][^{}]*}/', $textWithDisplacement, $accoladeMatches);

        // Nothing found.
        if (count($accoladeMatches[0]) === 0) {
            $element['text'] = $textWithDisplacement;

            return [
                'is_collection' => false,
                'element' => $element,
            ];
        }

        // In order to add bookmarks we can create a list of parent element and bookmark element which will be appended
        // at the end of the elements list, so it will be created in the net steps.

        $elements = [];

        $textContents = $textWithDisplacement;

        $accoladeMatches = array_unique($accoladeMatches[0]);

        foreach ($accoladeMatches as $accoladeMatch) {
            $textMatch = substr($accoladeMatch, 1, strlen($accoladeMatch) - 2);

            $pattern = '/(' . $accoladeMatch . ')([^{}\/]+)({\/' . $textMatch . '})/';

            preg_match_all($pattern, $textWithDisplacement, $matches);

            if (($matchesCount = count($matches[0])) > 0) {
                for ($i = 0; $i < $matchesCount; $i++) {
                    $foundText = $matches[0][$i];
                    $displacement = $matches[1][$i];
                    $textWithoutDisplacement = trim($matches[2][$i]);

                    $index = strpos($textContents, $foundText);
                    $plainText = substr($textContents, 0, $index);

                    if ($plainText) {
                        $elements[] = [
                            'element_type' => 'Text',
                            'text' => $plainText,
                            'font_style' => $element['font_style'],
                            'paragraph_style' => $element['paragraph_style'],
                        ];
                    }

                    $elements[] = [
                        'element_type' => 'TextRun',
                        'paragraph_style' => $element['paragraph_style'],
                        'elements' => [
                            [
                                'element_type' => 'Text',
                                'text' => $textWithoutDisplacement,
                                'font_style' => $element['font_style'],
                                'paragraph_style' => $element['paragraph_style'],
                            ],

                            [
                                'element_type' => 'Bookmark',
                                'name' => substr($displacement, 1, strlen($displacement) - 2),
                            ]
                        ],
                    ];

                    $textContents = substr($textContents, $index + strlen($foundText));
                }
            }
        }

        if ($textContents) {
            $elements[] = [
                'element_type' => 'Text',
                'text' => $textContents,
                'font_style' => $element['font_style'],
                'paragraph_style' => $element['paragraph_style'],
            ];
        }

        return [
            'is_collection' => true,
            'elements' => $elements,
        ];
    }

    protected function createDocx()
    {
        $path = 'contracts/' . $this->id . '-document.docx';

        $writer = new DocxWriter($this->storage, $path);

        $writer->execute($this->data);

        $this->path = $path;
    }

    /**
     * @throws \Exception
     */
    protected function convertToOriginalDocumentFormat()
    {
        if ($this->data['document_format'] === 'docx') {
            return;
        }

        $convertor = new DocxConvertor($this->storage, $this->path);

        if ($this->data['document_format'] === 'pdf') {
            $convertor->convertToPdfWithLibreOffice();
        }

        if ($this->data['document_format'] === 'odt') {
            $convertor->convertToODT();
        }

        if ($this->data['document_format'] === 'rtf') {
            $convertor->convertToRTF();
        }

        if ($this->data['document_format'] === 'doc') {
            $convertor->convertToDOC();
        }

        if ($this->data['document_format'] === 'txt') {
            $convertor->convertToTXT();
        }

        $this->path = $convertor->getPath();
    }

    protected function sendResponse($status)
    {
        try {
            WebhookCall::create()
                ->url($this->url)
                ->payload(['data' => [
                    'id' => $this->id,
                    'content' => '',
                    'file_result_type' => 'document-recreated',
                    'document_format' => $this->data['document_format'],
                    'status' => $status,
                ]])
                ->useSecret($this->secret)
                ->dispatch();

            return true;
        } catch (\Exception $exception) {
            Log::error('RecreateDocument@sendDocument: ' . $exception->getMessage());

            return false;
        }
    }
}