import currencies from '@/data/currencies';
import { type ClassValue, clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';

export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
}

/**
 * Formats bytes into a human-readable string (KB, MB, GB, etc.)
 * @param bytes - The number of bytes to format
 * @param decimals - Number of decimal places to include
 * @returns Formatted string with appropriate size unit
 */
export function formatBytes(bytes: number, decimals: number = 2): string {
   if (bytes === 0) return '0 Bytes';

   const k = 1024;
   const dm = decimals < 0 ? 0 : decimals;
   const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

   const i = Math.floor(Math.log(bytes) / Math.log(k));

   return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}

type DurationFormat = 'hhmmss' | 'readable';

// Calculate total duration from all sections and their lessons
export const getCourseDuration = (course: Course, format: DurationFormat = 'hhmmss'): string => {
   const totalSeconds = course.sections.reduce((totalTime, section) => {
      return (
         totalTime +
         section.section_lessons.reduce((sectionTime, lesson) => {
            // Convert "HH:mm:ss" format to seconds and add to total
            const [hours, minutes, seconds] = (lesson.duration || '00:00:00').split(':').map(Number);
            return sectionTime + (hours * 3600 + minutes * 60 + seconds);
         }, 0)
      );
   }, 0);

   const hours = Math.floor(totalSeconds / 3600);
   const minutes = Math.floor((totalSeconds % 3600) / 60);

   if (format === 'readable') {
      if (hours > 0 && minutes > 0) {
         return `${hours}hr ${minutes}min`;
      } else if (hours > 0) {
         return `${hours}hr`;
      } else {
         return `${minutes}min`;
      }
   }

   // Default to HH:MM:SS format
   const seconds = totalSeconds % 60;
   return `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
};

// Get completed content like lessons or quizzes
export const getCompletedContents = (watchHistory: WatchHistory): CompletedContent[] => {
   const completed =
      typeof watchHistory.completed_watching === 'string' ? JSON.parse(watchHistory.completed_watching) : watchHistory.completed_watching || [];

   return completed;
};

// Add completion calculation
export const getCourseCompletion = (course: Course, completed: CompletedContent[]) => {
   const totalItems = course.sections.reduce((total, section) => total + section.section_lessons.length + section.section_quizzes.length, 0);

   const completedItems = course.sections.reduce((total, section) => {
      const completedLessons = section.section_lessons.filter((lesson) =>
         completed.some((item) => String(item.id) === String(lesson.id) && item.type === 'lesson'),
      ).length;

      const completedQuizzes = section.section_quizzes.filter((quiz) =>
         completed.some((item) => String(item.id) === String(quiz.id) && item.type === 'quiz'),
      ).length;

      return total + completedLessons + completedQuizzes;
   }, 0);

   const percentage = totalItems > 0 ? ((completedItems / totalItems) * 100).toFixed(2) : '0.00';

   return {
      percentage,
      totalContents: totalItems,
      completedContents: completedItems,
   };
};

// export function disableRouterProgress() {
//     router.on('start', () => nProgress.remove());
//     router.on('finish', () => nProgress.remove());
// }

// Function to convert color to specified opacity
export const getColorWithOpacity = (color: string, opacity: number = 0.1) => {
   // Handle RGBA colors
   if (color.startsWith('rgba(')) {
      const match = color.match(/rgba\((\d+),(\d+),(\d+),([^)]+)\)/);
      if (match) {
         const [, r, g, b] = match;
         return `rgba(${r},${g},${b},${opacity})`;
      }
   }

   // Handle RGB colors
   if (color.startsWith('rgb(')) {
      const match = color.match(/rgb\((\d+),(\d+),(\d+)\)/);
      if (match) {
         const [, r, g, b] = match;
         return `rgba(${r},${g},${b},${opacity})`;
      }
   }

   // Handle HEX colors
   if (color.startsWith('#')) {
      const hex = color.replace('#', '');
      const r = parseInt(hex.substr(0, 2), 16);
      const g = parseInt(hex.substr(2, 2), 16);
      const b = parseInt(hex.substr(4, 2), 16);
      return `rgba(${r},${g},${b},${opacity})`;
   }

   // Handle named colors (basic ones)
   const namedColors: Record<string, string> = {
      red: 'rgba(255,0,0,',
      green: 'rgba(0,128,0,',
      blue: 'rgba(0,0,255,',
      yellow: 'rgba(255,255,0,',
      purple: 'rgba(128,0,128,',
      orange: 'rgba(255,165,0,',
      pink: 'rgba(255,192,203,',
      black: 'rgba(0,0,0,',
      white: 'rgba(255,255,255,',
   };

   if (namedColors[color.toLowerCase()]) {
      return `${namedColors[color.toLowerCase()]}${opacity})`;
   }

   return color;
};

export const systemCurrency = (currency: string) => {
   return currencies.find((item) => item.value == currency);
};

export function getReadingTime(description: string): string {
   // Remove HTML tags
   const plainText = description.replace(/<[^>]*>/g, '');
   // Count words
   const wordCount = plainText.trim().split(/\s+/).length;
   const wordsPerMinute = 200;
   const minutes = Math.ceil(wordCount / wordsPerMinute);

   return `${minutes} min read`;
}

// Auto-generate slug from title
export const generateSlug = (title: string) => {
   return title
      .toLowerCase()
      .replace(/[^a-z0-9\s-]/g, '')
      .replace(/\s+/g, '-')
      .replace(/-+/g, '-')
      .replace(/^-+|-+$/g, '');
};

// Helper to handle file download
export const handleDownload = async (resource: LessonResource, e: React.MouseEvent) => {
   e.preventDefault();
   try {
      // For non-link resources, use the download endpoint
      const url = route('resources.download', resource.id);
      window.open(url, '_blank');
   } catch (error) {
      // Fallback to direct download if the endpoint fails
      window.open(resource.resource, '_blank');
   }
};