<?php

namespace App\RSpade\Integrations\Scss;

use App\RSpade\Core\Manifest\ManifestModule_Abstract;

/**
 * Module for processing SCSS/CSS files in the manifest
 */
class Scss_ManifestModule extends ManifestModule_Abstract
{
    /**
     * Get file extensions this module handles
     */
    public function handles(): array
    {
        return ['scss', 'sass', 'css'];
    }
    
    /**
     * Get processing priority
     */
    public function priority(): int
    {
        return 1000; // Lowest priority, process after all other modules including Jqhtml
    }
    
    /**
     * Process a SCSS/CSS file and extract metadata
     *
     * For SCSS files, also detects if the file has a single top-level class selector
     * that matches a Blade view ID, JavaScript class extending Component,
     * or jqhtml template ID in the manifest.
     */
    public function process(string $file_path, array $metadata): array
    {
        $content = file_get_contents($file_path);
        $extension = pathinfo($file_path, PATHINFO_EXTENSION);
        
        $metadata['type'] = 'stylesheet';
        $metadata['format'] = $extension;
        
        // Extract imports
        $imports = [];
        
        // SCSS/Sass @import
        if (preg_match_all('/@import\s+[\'"]([^\'"]+)[\'"];/', $content, $matches)) {
            $imports = array_merge($imports, $matches[1]);
        }
        
        // CSS @import
        if (preg_match_all('/@import\s+url\s*\(\s*[\'"]?([^\'")\s]+)[\'"]?\s*\)/', $content, $matches)) {
            $imports = array_merge($imports, $matches[1]);
        }
        
        // SCSS/Sass @use
        if (preg_match_all('/@use\s+[\'"]([^\'"]+)[\'"]/', $content, $matches)) {
            $imports = array_merge($imports, $matches[1]);
        }
        
        if (!empty($imports)) {
            $metadata['imports'] = array_unique($imports);
        }
        
        // Extract variables (SCSS/Sass)
        if ($extension === 'scss' || $extension === 'sass') {
            $variables = [];
            if (preg_match_all('/\$([a-zA-Z_][\w-]*)\s*:/', $content, $matches)) {
                $variables = $matches[1];
            }
            
            if (!empty($variables)) {
                $metadata['variables'] = array_unique($variables);
            }
        }
        
        // Extract mixins (SCSS/Sass)
        if ($extension === 'scss' || $extension === 'sass') {
            $mixins = [];
            if (preg_match_all('/@mixin\s+([a-zA-Z_][\w-]*)/', $content, $matches)) {
                $mixins = $matches[1];
            }
            
            if (!empty($mixins)) {
                $metadata['mixins'] = array_unique($mixins);
            }
        }
        
        // Extract functions (SCSS/Sass)
        if ($extension === 'scss' || $extension === 'sass') {
            $functions = [];
            if (preg_match_all('/@function\s+([a-zA-Z_][\w-]*)/', $content, $matches)) {
                $functions = $matches[1];
            }
            
            if (!empty($functions)) {
                $metadata['functions'] = array_unique($functions);
            }
        }
        
        // Extract extends/placeholders (SCSS/Sass)
        if ($extension === 'scss' || $extension === 'sass') {
            $placeholders = [];
            if (preg_match_all('/%([a-zA-Z_][\w-]*)/', $content, $matches)) {
                $placeholders = $matches[1];
            }
            
            if (!empty($placeholders)) {
                $metadata['placeholders'] = array_unique($placeholders);
            }
        }
        
        // Extract main selectors (top-level classes/IDs)
        $selectors = [];

        // Remove comments to avoid false positives
        $clean_content = preg_replace('/\/\*.*?\*\//s', '', $content);
        $clean_content = preg_replace('/\/\/.*$/m', '', $clean_content);

        // Extract class selectors
        if (preg_match_all('/^\.([a-zA-Z_][\w-]*)/m', $clean_content, $matches)) {
            foreach ($matches[1] as $class) {
                $selectors[] = '.' . $class;
            }
        }

        // Extract ID selectors
        if (preg_match_all('/^#([a-zA-Z_][\w-]*)/m', $clean_content, $matches)) {
            foreach ($matches[1] as $id) {
                $selectors[] = '#' . $id;
            }
        }

        if (!empty($selectors)) {
            $metadata['selectors'] = array_unique($selectors);
        }

        // Check for single top-level class selector pattern for SCSS files
        if ($extension === 'scss') {
            $this->detect_scss_id($clean_content, $metadata);
        }
        
        // Check if it's a partial (starts with underscore)
        $filename = basename($file_path);
        if (str_starts_with($filename, '_')) {
            $metadata['is_partial'] = true;
        }
        
        // Determine scope based on path
        $relative_path = str_replace(base_path() . '/', '', $file_path);
        $metadata['relative_path'] = $relative_path;
        
        if (str_contains($relative_path, '/pages/')) {
            $metadata['scope'] = 'page';
        } elseif (str_contains($relative_path, '/components/')) {
            $metadata['scope'] = 'component';
        } elseif (str_contains($relative_path, '/layouts/')) {
            $metadata['scope'] = 'layout';
        } elseif (str_contains($relative_path, '/utilities/') || str_contains($relative_path, '/utils/')) {
            $metadata['scope'] = 'utility';
        } elseif (str_contains($relative_path, '/base/') || str_contains($relative_path, '/foundation/')) {
            $metadata['scope'] = 'base';
        } else {
            $metadata['scope'] = 'general';
        }
        
        // Check for media queries
        if (preg_match_all('/@media\s+([^{]+)/', $content, $matches)) {
            $media_queries = [];
            foreach ($matches[1] as $query) {
                $query = trim($query);
                if (str_contains($query, 'min-width')) {
                    $media_queries[] = 'responsive';
                }
                if (str_contains($query, 'print')) {
                    $media_queries[] = 'print';
                }
                if (str_contains($query, 'prefers-color-scheme')) {
                    $media_queries[] = 'dark-mode';
                }
            }
            
            if (!empty($media_queries)) {
                $metadata['media_features'] = array_unique($media_queries);
            }
        }
        
        // Check for CSS custom properties (CSS variables)
        $css_vars = [];
        if (preg_match_all('/--([a-zA-Z][\w-]*)/', $content, $matches)) {
            $css_vars = $matches[1];
        }
        
        if (!empty($css_vars)) {
            $metadata['css_variables'] = array_unique($css_vars);
        }
        
        // Check for Bootstrap usage
        if (preg_match('/\.(btn|col-|row|container|navbar|modal|card|form-control)/', $content)) {
            $metadata['uses_bootstrap'] = true;
        }
        
        // Check for Font Awesome usage
        if (preg_match('/\.(fa-|fas|far|fab|fal|fad)/', $content)) {
            $metadata['uses_fontawesome'] = true;
        }
        
        return $metadata;
    }

    /**
     * Detect if SCSS file has a single top-level class that qualifies as an ID
     *
     * The SCSS file gets an 'id' if:
     * 1. All rules are contained within a single top-level class selector
     * 2. The class name matches a Blade view ID, JS class extending Component, or jqhtml template
     * 3. No other SCSS file already has this ID
     */
    protected function detect_scss_id(string $clean_content, array &$metadata): void
    {
        // Remove all whitespace and newlines for easier parsing
        $compact = preg_replace('/\s+/', ' ', trim($clean_content));

        // Check if content starts with a single class selector and everything is inside it
        // Pattern: .ClassName { ... everything ... }
        if (!preg_match('/^\.([A-Z][a-zA-Z0-9_]+)\s*\{(.*)\}\s*$/', $compact, $matches)) {
            return;
        }

        $class_name = $matches[1];
        $inner_content = $matches[2];

        // Verify there are no other top-level rules by checking for unmatched closing braces
        // Count opening and closing braces in the inner content
        $open_braces = substr_count($inner_content, '{');
        $close_braces = substr_count($inner_content, '}');

        // If braces are balanced, everything is contained within the main selector
        if ($open_braces !== $close_braces) {
            return;
        }

        // Now check if this class name matches something in the manifest
        // During build, we need to access the in-memory manifest data
        // The get_all() method returns the cached data, not the in-progress build
        // We need a different approach - access the static data directly

        // Get access to the Manifest class's internal data using reflection
        $reflection = new \ReflectionClass(\App\RSpade\Core\Manifest\Manifest::class);
        $data_property = $reflection->getProperty('data');
        $data_property->setAccessible(true);
        $manifest_state = $data_property->getValue();

        if (!isset($manifest_state['data']['files'])) {
            return;
        }

        $manifest_data = $manifest_state['data']['files'];

        $found_match = false;
        $scss_id_already_exists = false;

        foreach ($manifest_data as $file_data) {
            // Check if another SCSS file already has this ID
            if (isset($file_data['id']) && $file_data['id'] === $class_name &&
                isset($file_data['extension']) && $file_data['extension'] === 'scss') {
                $scss_id_already_exists = true;
                break;
            }

            // Check for matching ID in Blade view or jqhtml template
            if (isset($file_data['id']) && $file_data['id'] === $class_name) {
                $found_match = true;
            }

            // Check for JavaScript class extending Component
            if (isset($file_data['extension']) && $file_data['extension'] === 'js' &&
                isset($file_data['class']) && $file_data['class'] === $class_name &&
                isset($file_data['extends']) && $file_data['extends'] === 'Component') {
                $found_match = true;
            }
        }

        // Only set ID if we found a match and no other SCSS has this ID
        if ($found_match && !$scss_id_already_exists) {
            $metadata['id'] = $class_name;
        }
    }
}