<?php

use dokuwiki\Extension\SyntaxPlugin;
use dokuwiki\plugin\luxtools\Crawler;
use dokuwiki\plugin\luxtools\Output;
use dokuwiki\plugin\luxtools\Path;

/**
 * LuxTools Plugin: Abstract base class for file-listing syntax handlers.
 *
 * Provides shared functionality for directory, files, and images syntax.
 */
abstract class syntax_plugin_luxtools_abstract extends SyntaxPlugin
{
    /**
     * Returns the syntax keyword (e.g., 'files', 'directory', 'images').
     * Used for pattern matching and plugin registration.
     *
     * @return string
     */
    abstract protected function getSyntaxKeyword(): string;

    /**
     * Returns the default parameters for this syntax handler.
     * Will be merged with the base defaults.
     *
     * @return array
     */
    protected function getDefaultParams(): array
    {
        return [];
    }

    /**
     * Process the parsed path/pattern. Override to customize path handling.
     *
     * @param string $path The cleaned path from the syntax
     * @return array Data to be passed to render()
     */
    abstract protected function processPath(string $path): array;

    /**
     * Perform the actual rendering. Override in each handler.
     *
     * @param string $format Output format (xhtml, odt, etc.)
     * @param \Doku_Renderer $renderer The renderer instance
     * @param array $pathData Path data from processPath()
     * @param array $params Parsed parameters
     * @return bool
     */
    abstract protected function doRender(string $format, \Doku_Renderer $renderer, array $pathData, array $params): bool;

    /** @inheritdoc */
    public function getType()
    {
        return 'substition';
    }

    /** @inheritdoc */
    public function getPType()
    {
        return 'block';
    }

    /** @inheritdoc */
    public function getSort()
    {
        return 222;
    }

    /** @inheritdoc */
    public function connectTo($mode)
    {
        $keyword = $this->getSyntaxKeyword();
        $pattern = '\{\{' . $keyword . '>.+?\}\}';
        $this->Lexer->addSpecialPattern($pattern, $mode, 'plugin_luxtools_' . $keyword);
    }

    /** @inheritdoc */
    public function handle($match, $state, $pos, Doku_Handler $handler)
    {
        global $INPUT;

        // Do not allow the syntax in discussion plugin comments
        if (!$this->getConf('allow_in_comments') && $INPUT->has('comment')) {
            return false;
        }

        $keyword = $this->getSyntaxKeyword();
        $match = substr($match, strlen('{{' . $keyword . '>'), -2);
        [$path, $flags] = array_pad(explode('&', $match, 2), 2, '');

        $params = $this->parseFlags($flags);
        $pathData = $this->processPath($path);

        return ['pathData' => $pathData, 'params' => $params];
    }

    /** @inheritdoc */
    public function render($format, Doku_Renderer $renderer, $data)
    {
        if ($data === false) {
            return false;
        }

        if ($format !== 'xhtml' && $format !== 'odt') {
            return false;
        }

        $pathData = $data['pathData'];
        $params = $data['params'];

        // Disable caching if requested
        if ($params['cache'] === 0) {
            $renderer->nocache();
        }

        return $this->doRender($format, $renderer, $pathData, $params);
    }

    /**
     * Parse flags string into parameters array.
     *
     * @param string $flags The flags string from the syntax
     * @return array Parsed parameters
     */
    protected function parseFlags(string $flags): array
    {
        // Base defaults shared by all handlers
        $baseDefaults = [
            'sort' => 'name',
            'order' => 'asc',
            'style' => 'list',
            'tableheader' => 0,
            'recursive' => 0,
            'titlefile' => '_title.txt',
            'cache' => 0,
            'randlinks' => 0,
            'showsize' => 0,
            'showdate' => 0,
            'listsep' => ', ',
            'maxheight' => 500,
        ];

        // Merge with handler-specific defaults
        $params = array_merge($baseDefaults, $this->getDefaultParams());

        // Load default config options and combine with provided flags
        $flags = $this->getConf('defaults') . '&' . $flags;
        $flagList = explode('&', $flags);

        foreach ($flagList as $flag) {
            if (empty(trim($flag))) {
                continue;
            }
            [$name, $value] = sexplode('=', $flag, 2, '');
            $params[trim($name)] = trim(trim($value), '"'); // quotes can be used to keep whitespace
        }

        return $params;
    }

    /**
     * Get path info with error handling.
     *
     * @param string $basePath The base path to resolve
     * @param \Doku_Renderer $renderer The renderer for error output
     * @return array|false Path info array or false on error
     */
    protected function getPathInfoSafe(string $basePath, \Doku_Renderer $renderer)
    {
        try {
            $pathHelper = new Path($this->getConf('paths'));
            return $pathHelper->getPathInfo($basePath);
        } catch (\Exception $e) {
            $this->renderError($renderer, 'error_outsidejail');
            return false;
        }
    }

    /**
     * Create and configure a Crawler instance.
     *
     * @param array $params The parameters array
     * @return Crawler
     */
    protected function createCrawler(array $params): Crawler
    {
        $crawler = new Crawler($this->getConf('extensions'));
        $crawler->setSortBy($params['sort']);
        $crawler->setSortReverse($params['order'] === 'desc');
        return $crawler;
    }

    /**
     * Render an error message.
     *
     * @param \Doku_Renderer $renderer The renderer
     * @param string $langKey The language key for the error message
     */
    protected function renderError(\Doku_Renderer $renderer, string $langKey): void
    {
        $renderer->cdata('[n/a: ' . $this->getLang($langKey) . ']');
    }

    /**
     * Separate a path into base directory and pattern.
     *
     * @param string $path The full path with pattern
     * @return array [base, pattern]
     */
    protected function separatePathAndPattern(string $path): array
    {
        $path = Path::cleanPath($path, false);
        $parts = explode('/', $path);
        $pattern = array_pop($parts);
        $base = implode('/', $parts) . '/';
        return [$base, $pattern];
    }
}