import React from 'react';
import { format, differenceInMinutes, parseISO } from 'date-fns';
import { CheckCircle2, Circle, Clock, MapPin, AlertCircle } from 'lucide-react';
import { useTourStore } from './useTourStore.js';

const TimeVariance = ({ planned, actual }: { planned: string, actual: string | null }) => {
  if (!actual) return null;
  
  const diff = differenceInMinutes(parseISO(actual), parseISO(planned));
  const isLate = diff > 0;
  
  return (
    <div className={`flex items-center text-xs font-medium mt-1 ${isLate ? 'text-red-500' : 'text-green-600'}`}>
      {isLate ? <AlertCircle className="w-3 h-3 mr-1" /> : <CheckCircle2 className="w-3 h-3 mr-1" />}
      <span>
        {isLate ? `Trễ ${diff} phút` : diff === 0 ? 'Đúng giờ' : `Sớm ${Math.abs(diff)} phút`}
      </span>
    </div>
  );
};

export const ItineraryTimeline = () => {
  const { legs } = useTourStore();

  const toggleComplete = async (locationId: string) => {
    // Gọi API PATCH /api/v1/locations/:id để cập nhật trạng thái
    console.log("Toggle status for location:", locationId);
  };

  return (
    <div className="max-w-2xl mx-auto p-4 sm:p-6 bg-gray-50 min-h-screen">
      <h2 className="text-2xl font-bold text-gray-800 mb-8 px-2">Lộ trình chuyến đi</h2>
      
      <div className="space-y-8">
        {legs.map((leg, legIdx) => (
          <div key={leg.id} className="relative">
            {/* Leg Header */}
            <div className="flex items-center mb-4 px-2">
              <div className="bg-blue-600 text-white text-sm font-bold px-3 py-1 rounded-full shadow-sm">
                Chặng {leg.sequence}
              </div>
              <div className="ml-4 h-[1px] flex-1 bg-gray-200" />
            </div>

            {/* Vertical Line for the whole leg */}
            <div className="absolute left-6 top-10 bottom-0 w-0.5 bg-gray-200 -z-0" />

            <div className="space-y-6 ml-2">
              {leg.locations.map((location) => (
                <div key={location.id} className="relative flex group">
                  {/* Timeline Node */}
                  <div className="z-10 mt-1.5 mr-4">
                    <button 
                      onClick={() => toggleComplete(location.id)}
                      className={`transition-colors duration-200 ${location.status === 'COMPLETED' ? 'text-green-500' : 'text-gray-300 hover:text-blue-500'}`}
                    >
                      {location.status === 'COMPLETED' ? (
                        <CheckCircle2 className="w-8 h-8 bg-white rounded-full" />
                      ) : (
                        <Circle className="w-8 h-8 bg-white rounded-full fill-white" />
                      )}
                    </button>
                  </div>

                  {/* Card Content */}
                  <div className={`flex-1 bg-white p-4 rounded-xl border transition-all duration-200 ${
                    location.status === 'COMPLETED' ? 'border-green-100 bg-green-50/30' : 'border-gray-100 shadow-sm hover:shadow-md'
                  }`}>
                    <div className="flex justify-between items-start">
                      <div>
                        <h3 className={`font-semibold text-lg ${location.status === 'COMPLETED' ? 'text-gray-500 line-through' : 'text-gray-800'}`}>
                          {location.name}
                        </h3>
                        <div className="flex items-center text-sm text-gray-500 mt-1">
                          <MapPin className="w-3 h-3 mr-1" />
                          <span className="truncate max-w-[200px] sm:max-w-md">{location.address}</span>
                        </div>
                      </div>
                      
                      <div className="text-right flex flex-col items-end">
                        <div className="flex items-center text-sm font-medium text-blue-600">
                          <Clock className="w-3 h-3 mr-1" />
                          {location.plannedStart ? format(parseISO(location.plannedStart), 'HH:mm') : '--:--'}
                        </div>
                        {location.status === 'COMPLETED' && location.actualStart && (
                          <div className="text-[10px] text-gray-400 mt-1 italic">
                            Thực tế: {format(parseISO(location.actualStart), 'HH:mm')}
                          </div>
                        )}
                      </div>
                    </div>

                    {/* Logic tính toán độ lệch thời gian */}
                    <TimeVariance planned={location.plannedStart || ''} actual={location.actualStart || null} />
                  </div>
                </div>
              ))}
            </div>
            
            {leg.notes && (
              <p className="ml-14 mt-4 text-sm text-gray-400 italic">
                * {leg.notes}
              </p>
            )}
          </div>
        ))}
      </div>
    </div>
  );
};