<?php

declare(strict_types=1);

namespace Yggverse\Gemini\Gemtext;

class Body
{
    private array $_lines = [];

    public function __construct(string $gemtext)
    {
        foreach ((array) explode(PHP_EOL, $gemtext) as $index => $line)
        {
            $this->_lines[$index] = $line;
        }
    }

    public function getLine(int $index): ?int
    {
        return isset($this->_lines[$index]) ? $this->_lines[$index] : null;
    }

    public function getLines(): array
    {
        return $this->_lines;
    }

    public function getH1(): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/^#([^#]+)/', trim($line), $match))
            {
                $matches[$index] = trim(
                    $match[1]
                );
            }
        }

        return $matches;
    }

    public function getH2(): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/^##([^#]+)/', trim($line), $match))
            {
                $matches[$index] = trim(
                    $match[1]
                );
            }
        }

        return $matches;
    }

    public function getH3(): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/^###([^#]+)/', trim($line), $match))
            {
                $matches[$index] = trim(
                    $match[1]
                );
            }
        }

        return $matches;
    }

    public function getLinks(): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/^=>(.*)/', trim($line), $match))
            {
                $matches[$index] = trim(
                    $match[1]
                );
            }
        }

        return $matches;
    }

    public function getQuote(): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/^>(.*)/', trim($line), $match))
            {
                $matches[$index] = trim(
                    $match[1]
                );
            }
        }

        return $matches;
    }

    public function findLinks(string $protocol = 'gemini'): array
    {
        $matches = [];

        foreach ($this->_lines as $index => $line)
        {
            if (preg_match('/' . $protocol . ':\/\/(.*)[\s\S\'"]*/', trim($line), $match))
            {
                $matches[$index] =
                sprintf(
                    '%s://%s',
                    $protocol,
                    trim(
                        $match[1]
                    )
                );
            }
        }

        return $matches;
    }

    public function skipTags(array $tags = []): string
    {
        $lines = [];

        foreach ($this->_lines as $line)
        {
            $line = trim(
                $line
            );

            if ($tags)
            {
                foreach ($tags as $tag)
                {
                    if(!in_array($tag, ['#', '##', '###', '=>', '*', '```']))
                    {
                        continue;
                    }

                    switch (true)
                    {
                        case str_starts_with($line, '#'):

                            $line = preg_replace(
                                sprintf(
                                    '/^%s([^#]+)/ui',
                                    $tag
                                ),
                                '$1',
                                $line
                            );

                        break;

                        case str_starts_with($line, '*'):

                            $line = preg_replace(
                                '/^\*(.*)/ui',
                                '$1',
                                $line
                            );

                        break;

                        default:

                            $line = preg_replace(
                                sprintf(
                                    '/^%s(.*)/ui',
                                    $tag
                                ),
                                '$1',
                                $line
                            );
                    }
                }
            }

            else
            {
                $line = preg_replace(
                    [
                        '/^#([^#]+)/ui',
                        '/^##([^#]+)/ui',
                        '/^###([^#]+)/ui',
                        '/^=>(.*)/ui',
                        '/^\*(.*)/ui',
                        '/^```(.*)/ui',
                    ],
                    '$1',
                    $line
                );
            }

            $lines[] = trim(
                $line
            );
        }

        return implode(
            PHP_EOL,
            $lines
        );
    }
}