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import React from 'react';
import { useTheme } from '../context/ThemeContext';
import { ThemeColors } from '../types';

// Color harmony functions
const adjustHue = (hue: number, amount: number): number => {
  return (hue + amount) % 360;
};

const getComplementaryColor = (hue: number): number => {
  return adjustHue(hue, 180);
};

const getAnalogousColors = (hue: number): number[] => {
  return [
    adjustHue(hue, -30),
    adjustHue(hue, 30)
  ];
};

const getTriadicColors = (hue: number): number[] => {
  return [
    adjustHue(hue, 120),
    adjustHue(hue, 240)
  ];
};

const getSplitComplementaryColors = (hue: number): number[] => {
  return [
    adjustHue(hue, 150),
    adjustHue(hue, 210)
  ];
};

const getTetradicColors = (hue: number): number[] => {
  return [
    adjustHue(hue, 90),
    adjustHue(hue, 180),
    adjustHue(hue, 270)
  ];
};

const hslToHex = (h: number, s: number, l: number): string => {
  l /= 100;
  const a = s * Math.min(l, 1 - l) / 100;
  const f = (n: number) => {
    const k = (n + h / 30) % 12;
    const color = l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
    return Math.round(255 * color).toString(16).padStart(2, '0');
  };
  return `#${f(0)}${f(8)}${f(4)}`;
};

const getRandomTheme = (): Partial<ThemeColors> => {
  // Generate a base hue (0-360)
  const baseHue = Math.floor(Math.random() * 360);
  
  // Randomly choose a color harmony scheme
  const schemes = [
    getTriadicColors,
    getSplitComplementaryColors,
    getTetradicColors,
    getAnalogousColors
  ];
  const selectedScheme = schemes[Math.floor(Math.random() * schemes.length)];
  const [secondaryHue, accentHue] = selectedScheme(baseHue);
  
  // Generate gradient colors with more variation
  const primaryGradientStart = hslToHex(baseHue, 70 + Math.random() * 20, 40 + Math.random() * 10);
  const primaryGradientEnd = hslToHex((baseHue + 20 + Math.random() * 20) % 360, 80 + Math.random() * 10, 35 + Math.random() * 10);
  
  const secondaryGradientStart = hslToHex(secondaryHue, 70 + Math.random() * 20, 60 + Math.random() * 10);
  const secondaryGradientEnd = hslToHex((secondaryHue + 20 + Math.random() * 20) % 360, 80 + Math.random() * 10, 55 + Math.random() * 10);
  
  const accentGradientStart = hslToHex(accentHue, 70 + Math.random() * 20, 50 + Math.random() * 10);
  const accentGradientEnd = hslToHex((accentHue + 20 + Math.random() * 20) % 360, 80 + Math.random() * 10, 45 + Math.random() * 10);
  
  return {
    primary: primaryGradientStart,
    'primary-dark': primaryGradientEnd,
    'primary-light': hslToHex(baseHue, 60 + Math.random() * 20, 70 + Math.random() * 10),
    secondary: secondaryGradientStart,
    'secondary-dark': secondaryGradientEnd,
    'secondary-light': hslToHex(secondaryHue, 60 + Math.random() * 20, 80 + Math.random() * 10),
    accent: accentGradientStart,
    'accent-dark': accentGradientEnd,
    'accent-light': hslToHex(accentHue, 60 + Math.random() * 20, 75 + Math.random() * 10),
    gradientStart: primaryGradientStart,
    gradientEnd: primaryGradientEnd,
  };
};

const ThemeCustomizer = () => {
  const { setTheme } = useTheme();

  const handleRandomize = () => {
    const newTheme = getRandomTheme();
    setTheme(newTheme);
  };

  return (
    <button
      className="fixed bottom-6 right-6 z-50 bg-primary text-background-light rounded-full shadow-lg p-4 hover:bg-primary-dark focus:outline-none"
      onClick={handleRandomize}
      aria-label="Randomize Theme"
    >
      🎲
    </button>
  );
};

export default ThemeCustomizer;