/**
 * Calendar Widget - displays upcoming events
 */

import { useState, useEffect } from "react";
import { Calendar as CalendarIcon, Clock, MapPin } from "lucide-react";
import type { WidgetProps } from "@mosaic/shared";

interface Event {
  id: string;
  title: string;
  startTime: string;
  endTime?: string;
  location?: string;
  allDay: boolean;
}

export function CalendarWidget({ id: _id, config: _config }: WidgetProps): React.JSX.Element {
  const [events, setEvents] = useState<Event[]>([]);
  const [isLoading, setIsLoading] = useState(true);

  // Mock data for now - will fetch from API later
  useEffect(() => {
    setIsLoading(true);
    const now = new Date();
    const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
    const tomorrow = new Date(today);
    tomorrow.setDate(tomorrow.getDate() + 1);

    setTimeout(() => {
      setEvents([
        {
          id: "1",
          title: "Team Standup",
          startTime: new Date(today.setHours(9, 0, 0, 0)).toISOString(),
          endTime: new Date(today.setHours(9, 30, 0, 0)).toISOString(),
          location: "Zoom",
          allDay: false,
        },
        {
          id: "2",
          title: "Project Review",
          startTime: new Date(today.setHours(14, 0, 0, 0)).toISOString(),
          endTime: new Date(today.setHours(15, 0, 0, 0)).toISOString(),
          location: "Conference Room A",
          allDay: false,
        },
        {
          id: "3",
          title: "Sprint Planning",
          startTime: new Date(tomorrow.setHours(10, 0, 0, 0)).toISOString(),
          endTime: new Date(tomorrow.setHours(12, 0, 0, 0)).toISOString(),
          allDay: false,
        },
      ]);
      setIsLoading(false);
    }, 500);
  }, []);

  const formatTime = (dateString: string): string => {
    const date = new Date(dateString);
    return date.toLocaleTimeString("en-US", {
      hour: "numeric",
      minute: "2-digit",
      hour12: true,
    });
  };

  const formatDay = (dateString: string): string => {
    const date = new Date(dateString);
    const today = new Date();
    const tomorrow = new Date(today);
    tomorrow.setDate(tomorrow.getDate() + 1);

    if (date.toDateString() === today.toDateString()) {
      return "Today";
    } else if (date.toDateString() === tomorrow.toDateString()) {
      return "Tomorrow";
    }
    return date.toLocaleDateString("en-US", { weekday: "short", month: "short", day: "numeric" });
  };

  const getUpcomingEvents = (): Event[] => {
    const now = new Date();
    return events
      .filter((e) => new Date(e.startTime) > now)
      .sort((a, b) => new Date(a.startTime).getTime() - new Date(b.startTime).getTime())
      .slice(0, 5);
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center h-full">
        <div className="text-gray-500 text-sm">Loading events...</div>
      </div>
    );
  }

  const upcomingEvents = getUpcomingEvents();

  return (
    <div className="flex flex-col h-full space-y-3">
      {/* Header */}
      <div className="flex items-center gap-2 text-gray-700">
        <CalendarIcon className="w-4 h-4" />
        <span className="text-sm font-medium">Upcoming Events</span>
      </div>

      {/* Event list */}
      <div className="flex-1 overflow-auto space-y-3">
        {upcomingEvents.length === 0 ? (
          <div className="text-center text-gray-500 text-sm py-4">No upcoming events</div>
        ) : (
          upcomingEvents.map((event) => (
            <div key={event.id} className="border-l-2 border-blue-500 pl-3 py-1">
              <div className="text-sm font-medium text-gray-900">{event.title}</div>
              <div className="flex items-center gap-3 mt-1 text-xs text-gray-500">
                {!event.allDay && (
                  <div className="flex items-center gap-1">
                    <Clock className="w-3 h-3" />
                    <span>
                      {formatTime(event.startTime)}
                      {event.endTime && ` - ${formatTime(event.endTime)}`}
                    </span>
                  </div>
                )}
                {event.location && (
                  <div className="flex items-center gap-1">
                    <MapPin className="w-3 h-3" />
                    <span>{event.location}</span>
                  </div>
                )}
                <div className="text-gray-400">{formatDay(event.startTime)}</div>
              </div>
            </div>
          ))
        )}
      </div>
    </div>
  );
}