import React, { useState, useEffect, useRef } from 'react';
import { PlayIcon, PauseIcon, ArrowPathIcon, XMarkIcon } from '@heroicons/react/24/outline';
import { useTranslation } from 'react-i18next';

interface PomodoroTimerProps {
  className?: string;
}

const POMODORO_STORAGE_KEY = 'tududi_pomodoro_timer';
const DEFAULT_TIME = 25 * 60; // 25 minutes in seconds

interface PomodoroState {
  isActive: boolean;
  timeLeft: number;
  isRunning: boolean;
  startTime?: number;
}

const PomodoroTimer: React.FC<PomodoroTimerProps> = ({ className = '' }) => {
  const { t } = useTranslation();
  const [isActive, setIsActive] = useState(false);
  const [timeLeft, setTimeLeft] = useState(DEFAULT_TIME);
  const [isRunning, setIsRunning] = useState(false);
  const [showCompletionMessage, setShowCompletionMessage] = useState(false);
  const intervalRef = useRef<NodeJS.Timeout | null>(null);

  // Load state from localStorage on mount
  useEffect(() => {
    const savedState = localStorage.getItem(POMODORO_STORAGE_KEY);
    if (savedState) {
      try {
        const state: PomodoroState = JSON.parse(savedState);
        if (state.isActive) {
          setIsActive(true);
          setTimeLeft(state.timeLeft);
          setIsRunning(state.isRunning);
          
          // If timer was running, calculate how much time has passed
          if (state.isRunning && state.startTime) {
            const elapsed = Math.floor((Date.now() - state.startTime) / 1000);
            const newTimeLeft = Math.max(0, state.timeLeft - elapsed);
            setTimeLeft(newTimeLeft);
            if (newTimeLeft > 0) {
              setIsRunning(true);
            } else {
              setIsRunning(false);
            }
          }
        }
      } catch (error) {
        console.error('Failed to load pomodoro state:', error);
      }
    }
  }, []);

  // Save state to localStorage whenever it changes
  useEffect(() => {
    const state: PomodoroState = {
      isActive,
      timeLeft,
      isRunning,
      startTime: isRunning ? Date.now() - (DEFAULT_TIME - timeLeft) * 1000 : undefined
    };
    localStorage.setItem(POMODORO_STORAGE_KEY, JSON.stringify(state));
  }, [isActive, timeLeft, isRunning]);

  useEffect(() => {
    if (isRunning && timeLeft > 0) {
      intervalRef.current = setInterval(() => {
        setTimeLeft(prev => {
          if (prev <= 1) {
            setIsRunning(false);
            setShowCompletionMessage(true);
            return 0;
          }
          return prev - 1;
        });
      }, 1000);
    } else {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }
    }

    return () => {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
      }
    };
  }, [isRunning, timeLeft]);

  const formatTime = (seconds: number) => {
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
  };

  const handleTomatoClick = () => {
    setIsActive(true);
    setTimeLeft(DEFAULT_TIME);
    setIsRunning(false);
  };

  const handlePlayPause = () => {
    setIsRunning(!isRunning);
  };

  const handleReset = () => {
    setIsRunning(false);
    setTimeLeft(DEFAULT_TIME);
    setShowCompletionMessage(false);
  };

  const handleClose = () => {
    setIsActive(false);
    setIsRunning(false);
    setTimeLeft(DEFAULT_TIME);
    setShowCompletionMessage(false);
    localStorage.removeItem(POMODORO_STORAGE_KEY);
  };

  // Tomato SVG Icon
  const TomatoIcon = () => (
    <svg 
      width="24" 
      height="24" 
      viewBox="0 0 24 24" 
      fill="none" 
      className="cursor-pointer hover:scale-110 transition-transform"
    >
      {/* Tomato body */}
      <path 
        d="M12 22c-4.5 0-8-3-8-7 0-2 1-4 2-5.5C7 8 8.5 7 10 7c1 0 2 .5 2 .5s1-.5 2-.5c1.5 0 3 1 4 2.5 1 1.5 2 3.5 2 5.5 0 4-3.5 7-8 7z" 
        fill="#e74c3c"
        stroke="#c0392b" 
        strokeWidth="1"
      />
      {/* Tomato stem */}
      <path 
        d="M10 7c0-1 .5-2 1-3 .5 1 1.5 2 1.5 3" 
        fill="none" 
        stroke="#27ae60" 
        strokeWidth="2" 
        strokeLinecap="round"
      />
      {/* Tomato leaf */}
      <path 
        d="M11 4c-1 0-2 1-2 2" 
        fill="none" 
        stroke="#27ae60" 
        strokeWidth="2" 
        strokeLinecap="round"
      />
    </svg>
  );

  if (!isActive) {
    return (
      <div className={`flex items-center ${className}`} onClick={handleTomatoClick}>
        <TomatoIcon />
      </div>
    );
  }

  return (
    <div className={`relative flex items-center space-x-2 ${className}`}>
      <div className="flex items-center space-x-2 bg-gray-100 dark:bg-gray-800 rounded-lg px-3 py-1">
        <span className="text-sm font-mono font-semibold text-gray-900 dark:text-white">
          {formatTime(timeLeft)}
        </span>
        
        <button
          onClick={handlePlayPause}
          className="flex items-center justify-center p-1 bg-blue-500 text-white rounded hover:bg-blue-600 transition-colors"
          aria-label={isRunning ? t('pomodoro.pause') : t('pomodoro.play')}
        >
          {isRunning ? (
            <PauseIcon className="h-3 w-3" />
          ) : (
            <PlayIcon className="h-3 w-3" />
          )}
        </button>
        
        <button
          onClick={handleReset}
          className="flex items-center justify-center p-1 bg-gray-500 text-white rounded hover:bg-gray-600 transition-colors"
          aria-label={t('pomodoro.reset')}
        >
          <ArrowPathIcon className="h-3 w-3" />
        </button>
        
        <button
          onClick={handleClose}
          className="flex items-center justify-center p-1 bg-red-500 text-white rounded hover:bg-red-600 transition-colors"
          aria-label={t('pomodoro.close')}
        >
          <XMarkIcon className="h-3 w-3" />
        </button>
      </div>
      
      {/* Completion Message */}
      {showCompletionMessage && (
        <div className="absolute top-full mt-2 right-0 bg-green-100 dark:bg-green-900 border border-green-300 dark:border-green-700 text-green-800 dark:text-green-200 px-3 py-2 rounded-lg shadow-lg z-50 whitespace-nowrap">
          <div className="flex items-center space-x-2 mb-2">
            <span className="text-sm font-medium">🍅 {t('pomodoro.complete')}</span>
          </div>
          <p className="text-xs mb-3">{t('pomodoro.completeMessage')}</p>
          <button
            onClick={() => {
              setShowCompletionMessage(false);
              setIsActive(false);
              setTimeLeft(DEFAULT_TIME);
              localStorage.removeItem(POMODORO_STORAGE_KEY);
            }}
            className="w-full text-xs px-3 py-1 bg-green-600 dark:bg-green-700 text-white rounded hover:bg-green-700 dark:hover:bg-green-600 transition-colors"
          >
            {t('pomodoro.done')}
          </button>
        </div>
      )}
    </div>
  );
};

export default PomodoroTimer;