import React, { useState, useRef, useEffect, useMemo, useCallback } from 'react';
import { createPortal } from 'react-dom';
import { useAppSelector } from '@/hooks/useAppSelector';
import { useSocket } from '@/socket/socketContext';
import { SocketEvents } from '@/shared/socket-events';
import { Task } from '@/types/task-management.types';
import { MinusOutlined, PauseOutlined, DoubleRightOutlined } from '@ant-design/icons';

interface TaskPriorityDropdownProps {
  task: Task;
  projectId: string;
  isDarkMode?: boolean;
}

const TaskPriorityDropdown: React.FC<TaskPriorityDropdownProps> = ({ 
  task, 
  projectId, 
  isDarkMode = false 
}) => {
  const { socket, connected } = useSocket();
  const [isOpen, setIsOpen] = useState(false);
  const [dropdownPosition, setDropdownPosition] = useState({ top: 0, left: 0 });
  const buttonRef = useRef<HTMLButtonElement>(null);
  const dropdownRef = useRef<HTMLDivElement>(null);
  
  const priorityList = useAppSelector(state => state.priorityReducer.priorities);
  
  // Find current priority details
  const currentPriority = useMemo(() => {
    return priorityList.find(priority => 
      priority.name?.toLowerCase() === task.priority?.toLowerCase() ||
      priority.id === task.priority
    );
  }, [priorityList, task.priority]);

  // Handle priority change
  const handlePriorityChange = useCallback((priorityId: string, priorityName: string) => {
    if (!task.id || !priorityId || !connected) return;

    console.log('🎯 Priority change initiated:', { taskId: task.id, priorityId, priorityName });

    socket?.emit(
      SocketEvents.TASK_PRIORITY_CHANGE.toString(),
      JSON.stringify({
        task_id: task.id,
        priority_id: priorityId,
        team_id: projectId, // Using projectId as teamId
      })
    );
    setIsOpen(false);
  }, [task.id, connected, socket, projectId]);

  // Calculate dropdown position and handle outside clicks
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (buttonRef.current && buttonRef.current.contains(event.target as Node)) {
        return; // Don't close if clicking the button
      }
      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
        setIsOpen(false);
      }
    };

    if (isOpen && buttonRef.current) {
      // Calculate position
      const rect = buttonRef.current.getBoundingClientRect();
      setDropdownPosition({
        top: rect.bottom + window.scrollY + 4,
        left: rect.left + window.scrollX,
      });
      
      document.addEventListener('mousedown', handleClickOutside);
    }

    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [isOpen]);

  // Get priority color
  const getPriorityColor = useCallback((priority: any) => {
    if (isDarkMode) {
      return priority?.color_code_dark || priority?.color_code || '#4b5563';
    }
    return priority?.color_code || '#6b7280';
  }, [isDarkMode]);

  // Get priority icon
  const getPriorityIcon = useCallback((priorityName: string) => {
    const name = priorityName?.toLowerCase();
    switch (name) {
      case 'low':
        return <MinusOutlined className="w-3 h-3" />;
      case 'medium':
        return <PauseOutlined className="w-3 h-3" style={{ transform: 'rotate(90deg)' }} />;
      case 'high':
        return <DoubleRightOutlined className="w-3 h-3" style={{ transform: 'rotate(90deg)' }} />;
      default:
        return <MinusOutlined className="w-3 h-3" />;
    }
  }, []);

  // Format priority name for display
  const formatPriorityName = useCallback((name: string) => {
    if (!name) return name;
    return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
  }, []);

  if (!task.priority) return null;

  return (
    <>
      {/* Priority Button - Simple text display like status */}
      <button
        ref={buttonRef}
        onClick={(e) => {
          e.preventDefault();
          e.stopPropagation();
          setIsOpen(!isOpen);
        }}
        className={`
          inline-flex items-center gap-1 px-3 py-1 rounded-full text-xs font-medium
          transition-all duration-200 hover:opacity-80 border-0 min-w-[70px] max-w-full justify-center
          whitespace-nowrap
        `}
        style={{
          backgroundColor: currentPriority ? getPriorityColor(currentPriority) : (isDarkMode ? '#4b5563' : '#9ca3af'),
          color: 'white',
        }}
      >
        <span className="truncate">
          {currentPriority ? formatPriorityName(currentPriority.name || '') : formatPriorityName(task.priority)}
        </span>
        <svg 
          className={`w-3 h-3 transition-transform duration-200 ${isOpen ? 'rotate-180' : ''}`}
          fill="none"
          stroke="currentColor"
          viewBox="0 0 24 24"
        >
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
        </svg>
      </button>

      {/* Dropdown Menu */}
      {isOpen && createPortal(
        <div 
          ref={dropdownRef}
          className={`
            fixed min-w-[160px] max-w-[220px] 
            rounded border backdrop-blur-xs z-9999
            ${isDarkMode 
              ? 'bg-gray-900/95 border-gray-600 shadow-2xl shadow-black/50' 
              : 'bg-white/95 border-gray-200 shadow-2xl shadow-gray-500/20'
            }
          `}
          style={{ 
            top: dropdownPosition.top,
            left: dropdownPosition.left,
            zIndex: 9999,
            animation: 'fadeInScale 0.15s ease-out',
          }}
        >
          {/* Priority Options */}
          <div className="py-1 max-h-64 overflow-y-auto">
            {priorityList.map((priority, index) => {
              const isSelected = priority.name?.toLowerCase() === task.priority?.toLowerCase() || priority.id === task.priority;
              
              return (
                <button
                  key={priority.id}
                  onClick={() => handlePriorityChange(priority.id!, priority.name!)}
                  className={`
                    w-full px-3 py-2.5 text-left text-xs font-medium flex items-center gap-3
                    transition-all duration-150 hover:scale-[1.02] active:scale-[0.98]
                    ${isDarkMode 
                      ? 'hover:bg-gray-700/80 text-gray-100' 
                      : 'hover:bg-gray-50/70 text-gray-900'
                    }
                    ${isSelected
                      ? (isDarkMode ? 'bg-gray-700/60 ring-1 ring-blue-400/40' : 'bg-blue-50/50 ring-1 ring-blue-200') 
                      : ''
                    }
                  `}
                  style={{
                    animationDelay: `${index * 30}ms`,
                    animation: 'slideInFromLeft 0.2s ease-out forwards',
                  }}
                >
                  {/* Priority Icon */}
                  <div className="flex items-center justify-center w-4 h-4">
                    {getPriorityIcon(priority.name || '')}
                  </div>
                  
                  {/* Priority Color Indicator */}
                  <div 
                    className={`w-3 h-3 rounded-full shadow-sm border-2 ${
                      isDarkMode ? 'border-gray-800/30' : 'border-white/20'
                    }`}
                    style={{ backgroundColor: getPriorityColor(priority) }}
                  />
                  
                  {/* Priority Name */}
                  <span className="flex-1 truncate">
                    {formatPriorityName(priority.name || '')}
                  </span>
                  
                  {/* Current Priority Badge */}
                  {isSelected && (
                    <div className="flex items-center gap-1">
                      <div className={`w-1.5 h-1.5 rounded-full ${isDarkMode ? 'bg-blue-400' : 'bg-blue-500'}`} />
                      <span className={`text-xs font-medium ${isDarkMode ? 'text-blue-300' : 'text-blue-600'}`}>
                        Current
                      </span>
                    </div>
                  )}
                </button>
              );
            })}
          </div>
        </div>,
        document.body
      )}

      {/* CSS Animations */}
      {isOpen && createPortal(
        <style>
          {`
            @keyframes fadeInScale {
              from {
                opacity: 0;
                transform: scale(0.95) translateY(-5px);
              }
              to {
                opacity: 1;
                transform: scale(1) translateY(0);
              }
            }
            
            @keyframes slideInFromLeft {
              from {
                opacity: 0;
                transform: translateX(-10px);
              }
              to {
                opacity: 1;
                transform: translateX(0);
              }
            }
          `}
        </style>,
        document.head
      )}
    </>
  );
};

export default TaskPriorityDropdown;