<?php

namespace App\RSpade\CodeQuality\Rules\Jqhtml;

use App\RSpade\CodeQuality\Rules\CodeQualityRule_Abstract;

/**
 * JQHTML Redundant Class Rule
 *
 * Detects when a component's class name (or kebab-case equivalent) is redundantly
 * specified in the class attribute of the Define tag. Component names are automatically
 * added to the rendered element's class list, so explicitly including them is unnecessary.
 *
 * Detects both:
 *   <Define:Breadcrumb_Nav class="Breadcrumb_Nav">   // Exact match
 *   <Define:Breadcrumb_Nav class="breadcrumb-nav">   // Kebab-case equivalent
 */
class JqhtmlRedundantClass_CodeQualityRule extends CodeQualityRule_Abstract
{
    /**
     * Get the unique identifier for this rule
     */
    public function get_id(): string
    {
        return 'JQHTML-CLASS-01';
    }

    /**
     * Get the human-readable name of this rule
     */
    public function get_name(): string
    {
        return 'JQHTML Redundant Component Class Name';
    }

    /**
     * Get the description of what this rule checks
     */
    public function get_description(): string
    {
        return 'Detects when component class name (or kebab-case equivalent) is redundantly specified in class attribute';
    }

    /**
     * Get file patterns this rule should check
     */
    public function get_file_patterns(): array
    {
        return ['*.jqhtml'];
    }

    /**
     * This rule runs during manifest scan for immediate feedback
     */
    public function is_called_during_manifest_scan(): bool
    {
        return true;
    }

    /**
     * Get the default severity level
     */
    public function get_default_severity(): string
    {
        return 'medium';
    }

    /**
     * Check the file for violations
     */
    public function check(string $file_path, string $contents, array $metadata = []): void
    {
        $lines = explode("\n", $contents);
        $line_number = 0;

        foreach ($lines as $line) {
            $line_number++;

            // Look for <Define:ComponentName ... class="..."> patterns
            // Match Define tag with component name and class attribute on same line
            if (preg_match('/<Define:([a-zA-Z_][a-zA-Z0-9_]*)\s+[^>]*class=["\']([^"\']*)["\']/', $line, $matches)) {
                $component_name = $matches[1];
                $class_attribute = $matches[2];
                $kebab_case = $this->to_kebab_case($component_name);

                // Split class attribute into individual classes
                $classes = preg_split('/\s+/', trim($class_attribute));

                foreach ($classes as $class) {
                    $class = trim($class);
                    if (empty($class)) {
                        continue;
                    }

                    // Check for exact match with component name
                    if ($class === $component_name) {
                        $this->add_violation(
                            $file_path,
                            $line_number,
                            "Redundant class=\"{$component_name}\" on component {$component_name}. " .
                            "The component automatically gets class=\"{$component_name}\" assigned to it.",
                            trim($line),
                            $this->build_exact_match_suggestion($component_name, $class_attribute),
                            'medium'
                        );
                    }
                    // Check for kebab-case equivalent (case-insensitive)
                    // Only flag if component name has underscores (multi-word), since single-word
                    // lowercase classes like "card" could be legitimate external CSS framework classes
                    // Also skip known CSS framework class prefixes (Bootstrap, etc.)
                    elseif (strpos($component_name, '_') !== false
                            && strtolower($class) === $kebab_case
                            && !$this->is_known_framework_class($class)) {
                        $this->add_violation(
                            $file_path,
                            $line_number,
                            "Unnecessary class=\"{$class}\" on component {$component_name}. " .
                            "The component automatically gets class=\"{$component_name}\" assigned to it. " .
                            "Use .{$component_name} in CSS/JS selectors instead of .{$class}",
                            trim($line),
                            $this->build_kebab_case_suggestion($component_name, $class),
                            'medium'
                        );
                    }
                }
            }
        }
    }

    /**
     * Convert PascalCase_With_Underscores to kebab-case
     *
     * My_Component -> my-component
     * Breadcrumb_Nav -> breadcrumb-nav
     */
    private function to_kebab_case(string $component_name): string
    {
        return strtolower(str_replace('_', '-', $component_name));
    }

    /**
     * Check if a class name is a known CSS framework class
     *
     * These are legitimate uses of kebab-case classes from external frameworks
     * like Bootstrap that happen to match component names.
     */
    private function is_known_framework_class(string $class): bool
    {
        // Bootstrap class prefixes that are commonly used
        $bootstrap_prefixes = [
            'card-',
            'btn-',
            'nav-',
            'navbar-',
            'form-',
            'input-',
            'list-',
            'table-',
            'modal-',
            'alert-',
            'badge-',
            'dropdown-',
            'breadcrumb-',
            'pagination-',
            'progress-',
            'spinner-',
            'toast-',
            'tooltip-',
            'popover-',
            'carousel-',
            'accordion-',
            'offcanvas-',
            'placeholder-',
        ];

        foreach ($bootstrap_prefixes as $prefix) {
            if (strpos($class, $prefix) === 0) {
                return true;
            }
        }

        return false;
    }

    /**
     * Build suggestion for exact component name match
     */
    private function build_exact_match_suggestion(string $component_name, string $class_attribute): string
    {
        $cleaned = $this->remove_class_from_attribute($class_attribute, $component_name);

        $lines = [];
        $lines[] = "Remove '{$component_name}' from the class attribute. Component names are";
        $lines[] = "automatically added to the rendered element's class list by the jqhtml framework.";
        $lines[] = "";
        $lines[] = "CURRENT:";
        $lines[] = "  <Define:{$component_name} class=\"{$class_attribute}\">";
        $lines[] = "";
        if (empty($cleaned)) {
            $lines[] = "CORRECTED:";
            $lines[] = "  <Define:{$component_name}>";
        } else {
            $lines[] = "CORRECTED:";
            $lines[] = "  <Define:{$component_name} class=\"{$cleaned}\">";
        }

        return implode("\n", $lines);
    }

    /**
     * Build suggestion for kebab-case equivalent
     */
    private function build_kebab_case_suggestion(string $component_name, string $redundant_class): string
    {
        $lines = [];
        $lines[] = "The class \"{$redundant_class}\" is redundant because jqhtml components";
        $lines[] = "automatically receive their component name as a CSS class.";
        $lines[] = "";
        $lines[] = "When you write:";
        $lines[] = "  <Define:{$component_name} class=\"{$redundant_class}\">";
        $lines[] = "";
        $lines[] = "The rendered element becomes:";
        $lines[] = "  <div class=\"{$component_name} {$redundant_class}\">";
        $lines[] = "";
        $lines[] = "TO FIX:";
        $lines[] = "  1. Remove the redundant class from the Define tag:";
        $lines[] = "     <Define:{$component_name}>";
        $lines[] = "";
        $lines[] = "  2. Update any CSS/SCSS selectors to use the component class:";
        $lines[] = "     .{$component_name} { ... }  // Instead of .{$redundant_class}";
        $lines[] = "";
        $lines[] = "  3. Update any JavaScript selectors:";
        $lines[] = "     \$('.{$component_name}')  // Instead of \$('.{$redundant_class}')";

        return implode("\n", $lines);
    }

    /**
     * Remove a class from the class attribute string
     */
    private function remove_class_from_attribute(string $class_attribute, string $class_to_remove): string
    {
        $cleaned = preg_replace('/\b' . preg_quote($class_to_remove, '/') . '\b\s*/', '', $class_attribute);
        $cleaned = preg_replace('/\s+/', ' ', $cleaned);
        return trim($cleaned);
    }
}