/**
 * Generate a solid color background for a segment
 * Returns a CSS color based on the segment position
 */
export const generateSolidColor = (
  time: number,
  duration: number
): string => {
  // Use the time position to create different colors
  // This gives each segment a different color without needing an image
  const position = Math.min(Math.max(time / (duration || 1), 0), 1);
  
  // Calculate color based on position
  // Use an extremely light blue-based color palette
  const hue = 210; // Blue base
  const saturation = 40 + Math.floor(position * 20); // 40-60% (less saturated)
  const lightness = 85 + Math.floor(position * 8); // 85-93% (extremely light)
  
  return `hsl(${hue}, ${saturation}%, ${lightness}%)`;
};

/**
 * Legacy function kept for compatibility
 * Now returns a data URL for a solid color square instead of a video thumbnail
 */
export const generateThumbnail = async (
  videoElement: HTMLVideoElement, 
  time: number
): Promise<string> => {
  return new Promise((resolve) => {
    // Create a small canvas for the solid color
    const canvas = document.createElement('canvas');
    canvas.width = 10; // Much smaller - we only need a color
    canvas.height = 10;
    
    const ctx = canvas.getContext('2d');
    if (ctx) {
      // Get the solid color based on time
      const color = generateSolidColor(time, videoElement.duration);
      
      // Fill with solid color
      ctx.fillStyle = color;
      ctx.fillRect(0, 0, canvas.width, canvas.height);
    }
    
    // Convert to data URL (much smaller now)
    const dataUrl = canvas.toDataURL('image/png', 0.5);
    resolve(dataUrl);
  });
};