<?php

namespace Faker\Provider;

use Faker\Generator;
use Faker\UniqueGenerator;

class HtmlLorem extends Base
{
    public const HTML_TAG = 'html';
    public const HEAD_TAG = 'head';
    public const BODY_TAG = 'body';
    public const DIV_TAG = 'div';
    public const P_TAG = 'p';
    public const A_TAG = 'a';
    public const SPAN_TAG = 'span';
    public const TABLE_TAG = 'table';
    public const THEAD_TAG = 'thead';
    public const TBODY_TAG = 'tbody';
    public const TR_TAG = 'tr';
    public const TD_TAG = 'td';
    public const TH_TAG = 'th';
    public const UL_TAG = 'ul';
    public const LI_TAG = 'li';
    public const H_TAG = 'h';
    public const B_TAG = 'b';
    public const I_TAG = 'i';
    public const TITLE_TAG = 'title';
    public const FORM_TAG = 'form';
    public const INPUT_TAG = 'input';
    public const LABEL_TAG = 'label';

    private $idGenerator;

    public function __construct(Generator $generator)
    {
        parent::__construct($generator);
        $generator->addProvider(new Lorem($generator));
        $generator->addProvider(new Internet($generator));
    }

    /**
     * @param int $maxDepth
     * @param int $maxWidth
     *
     * @return string
     */
    public function randomHtml($maxDepth = 4, $maxWidth = 4)
    {
        if (!class_exists(\DOMDocument::class, false)) {
            throw new \RuntimeException('ext-dom is required to use randomHtml.');
        }

        $document = new \DOMDocument();
        $this->idGenerator = new UniqueGenerator($this->generator);

        $head = $document->createElement('head');
        $this->addRandomTitle($head);

        $body = $document->createElement('body');
        $this->addLoginForm($body);
        $this->addRandomSubTree($body, $maxDepth, $maxWidth);

        $html = $document->createElement('html');
        $html->appendChild($head);
        $html->appendChild($body);

        $document->appendChild($html);

        return $document->saveHTML();
    }

    private function addRandomSubTree(\DOMElement $root, $maxDepth, $maxWidth)
    {
        --$maxDepth;

        if ($maxDepth <= 0) {
            return $root;
        }

        $siblings = self::numberBetween(1, $maxWidth);

        for ($i = 0; $i < $siblings; ++$i) {
            if ($maxDepth == 1) {
                $this->addRandomLeaf($root);
            } else {
                $sibling = $root->ownerDocument->createElement('div');
                $root->appendChild($sibling);
                $this->addRandomAttribute($sibling);
                $this->addRandomSubTree($sibling, self::numberBetween(0, $maxDepth), $maxWidth);
            }
        }

        return $root;
    }

    private function addRandomLeaf(\DOMElement $node): void
    {
        $rand = self::numberBetween(1, 10);

        switch ($rand) {
            case 1:
                $this->addRandomP($node);

                break;

            case 2:
                $this->addRandomA($node);

                break;

            case 3:
                $this->addRandomSpan($node);

                break;

            case 4:
                $this->addRandomUL($node);

                break;

            case 5:
                $this->addRandomH($node);

                break;

            case 6:
                $this->addRandomB($node);

                break;

            case 7:
                $this->addRandomI($node);

                break;

            case 8:
                $this->addRandomTable($node);

                break;

            default:
                $this->addRandomText($node);

                break;
        }
    }

    private function addRandomAttribute(\DOMElement $node): void
    {
        $rand = self::numberBetween(1, 2);

        switch ($rand) {
            case 1:
                $node->setAttribute('class', $this->generator->word());

                break;

            case 2:
                $node->setAttribute('id', (string) $this->idGenerator->randomNumber(5));

                break;
        }
    }

    private function addRandomP(\DOMElement $element, $maxLength = 10): void
    {
        $node = $element->ownerDocument->createElement(static::P_TAG);
        $node->textContent = $this->generator->sentence(self::numberBetween(1, $maxLength));
        $element->appendChild($node);
    }

    private function addRandomText(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $element->appendChild($text);
    }

    private function addRandomA(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement(static::A_TAG);
        $node->setAttribute('href', $this->generator->safeEmailDomain());
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addRandomTitle(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement(static::TITLE_TAG);
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addRandomH(\DOMElement $element, $maxLength = 10): void
    {
        $h = static::H_TAG . (string) self::numberBetween(1, 3);
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement($h);
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addRandomB(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement(static::B_TAG);
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addRandomI(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement(static::I_TAG);
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addRandomSpan(\DOMElement $element, $maxLength = 10): void
    {
        $text = $element->ownerDocument->createTextNode($this->generator->sentence(self::numberBetween(1, $maxLength)));
        $node = $element->ownerDocument->createElement(static::SPAN_TAG);
        $node->appendChild($text);
        $element->appendChild($node);
    }

    private function addLoginForm(\DOMElement $element): void
    {
        $textInput = $element->ownerDocument->createElement(static::INPUT_TAG);
        $textInput->setAttribute('type', 'text');
        $textInput->setAttribute('id', 'username');

        $textLabel = $element->ownerDocument->createElement(static::LABEL_TAG);
        $textLabel->setAttribute('for', 'username');
        $textLabel->textContent = $this->generator->word();

        $passwordInput = $element->ownerDocument->createElement(static::INPUT_TAG);
        $passwordInput->setAttribute('type', 'password');
        $passwordInput->setAttribute('id', 'password');

        $passwordLabel = $element->ownerDocument->createElement(static::LABEL_TAG);
        $passwordLabel->setAttribute('for', 'password');
        $passwordLabel->textContent = $this->generator->word();

        $submit = $element->ownerDocument->createElement(static::INPUT_TAG);
        $submit->setAttribute('type', 'submit');
        $submit->setAttribute('value', $this->generator->word());

        $submit = $element->ownerDocument->createElement(static::FORM_TAG);
        $submit->setAttribute('action', $this->generator->safeEmailDomain());
        $submit->setAttribute('method', 'POST');
        $submit->appendChild($textLabel);
        $submit->appendChild($textInput);
        $submit->appendChild($passwordLabel);
        $submit->appendChild($passwordInput);
        $element->appendChild($submit);
    }

    private function addRandomTable(\DOMElement $element, $maxRows = 10, $maxCols = 6, $maxTitle = 4, $maxLength = 10): void
    {
        $rows = self::numberBetween(1, $maxRows);
        $cols = self::numberBetween(1, $maxCols);

        $table = $element->ownerDocument->createElement(static::TABLE_TAG);
        $thead = $element->ownerDocument->createElement(static::THEAD_TAG);
        $tbody = $element->ownerDocument->createElement(static::TBODY_TAG);

        $table->appendChild($thead);
        $table->appendChild($tbody);

        $tr = $element->ownerDocument->createElement(static::TR_TAG);
        $thead->appendChild($tr);

        for ($i = 0; $i < $cols; ++$i) {
            $th = $element->ownerDocument->createElement(static::TH_TAG);
            $th->textContent = $this->generator->sentence(self::numberBetween(1, $maxTitle));
            $tr->appendChild($th);
        }

        for ($i = 0; $i < $rows; ++$i) {
            $tr = $element->ownerDocument->createElement(static::TR_TAG);
            $tbody->appendChild($tr);

            for ($j = 0; $j < $cols; ++$j) {
                $th = $element->ownerDocument->createElement(static::TD_TAG);
                $th->textContent = $this->generator->sentence(self::numberBetween(1, $maxLength));
                $tr->appendChild($th);
            }
        }
        $element->appendChild($table);
    }

    private function addRandomUL(\DOMElement $element, $maxItems = 11, $maxLength = 4): void
    {
        $num = self::numberBetween(1, $maxItems);
        $ul = $element->ownerDocument->createElement(static::UL_TAG);

        for ($i = 0; $i < $num; ++$i) {
            $li = $element->ownerDocument->createElement(static::LI_TAG);
            $li->textContent = $this->generator->sentence(self::numberBetween(1, $maxLength));
            $ul->appendChild($li);
        }
        $element->appendChild($ul);
    }
}