"use client";

import { useState } from "react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { Calendar, Clock, MapPin, ExternalLink, FileText, X } from "lucide-react";
import { format, parseISO } from "date-fns";
import { cn } from "@/lib/utils";
import { siteUrls } from "@/lib/config/sites";

interface CalendarEvent {
  id: string;
  summary: string;
  description?: string;
  start: {
    dateTime?: string;
    date?: string;
  };
  end: {
    dateTime?: string;
    date?: string;
  };
  location?: string;
  calendarId: string;
  calendarName: string;
  htmlLink?: string;
}

interface EventDetailModalProps {
  event: CalendarEvent | null;
  isOpen: boolean;
  onClose: () => void;
}

function getEventDate(event: { start: { dateTime?: string; date?: string } }): Date {
  if (event.start.dateTime) {
    return parseISO(event.start.dateTime);
  }
  if (event.start.date) {
    return parseISO(event.start.date);
  }
  return new Date();
}

function getEventEndDate(event: { end: { dateTime?: string; date?: string } }): Date | null {
  if (event.end.dateTime) {
    return parseISO(event.end.dateTime);
  }
  if (event.end.date) {
    return parseISO(event.end.date);
  }
  return null;
}

function isAllDayEvent(event: { start: { dateTime?: string; date?: string } }): boolean {
  return !!event.start.date && !event.start.dateTime;
}

function getCalendarColor(calendarName: string): string {
  const colors: Record<string, string> = {
    personal: "bg-pink-500 text-white",
    work: "bg-blue-500 text-white",
    health: "bg-green-500 text-white",
    social: "bg-purple-500 text-white",
    family: "bg-yellow-500 text-black",
    task: "bg-orange-500 text-white",
    primary: "bg-blue-600 text-white",
  };

  const lower = calendarName.toLowerCase();
  for (const [key, color] of Object.entries(colors)) {
    if (lower.includes(key)) return color;
  }

  return "bg-muted text-muted-foreground";
}

function formatEventTime(event: CalendarEvent): string {
  if (isAllDayEvent(event)) {
    return "All day";
  }

  const start = getEventDate(event);
  const end = getEventEndDate(event);

  if (end) {
    return `${format(start, "h:mm a")} - ${format(end, "h:mm a")}`;
  }

  return format(start, "h:mm a");
}

function formatEventDate(event: CalendarEvent): string {
  const date = getEventDate(event);
  return format(date, "EEEE, MMMM d, yyyy");
}

export function EventDetailModal({ event, isOpen, onClose }: EventDetailModalProps) {
  if (!event) return null;

  const eventUrl = event.htmlLink || `${siteUrls.googleCalendar}/calendar/event?eid=${btoa(event.id)}`;

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent className="sm:max-w-lg">
        <DialogHeader>
          <div className="flex items-start gap-3">
            <Badge className={cn("shrink-0", getCalendarColor(event.calendarName))}>
              {event.calendarName}
            </Badge>
            <Button
              variant="ghost"
              size="icon"
              className="shrink-0 -mr-2 -mt-2"
              onClick={onClose}
            >
              <X className="w-4 h-4" />
            </Button>
          </div>
          <DialogTitle className="text-xl mt-2">{event.summary}</DialogTitle>
        </DialogHeader>

        <div className="space-y-4 mt-2">
          {/* Date and Time */}
          <div className="flex items-start gap-3">
            <div className="w-8 h-8 rounded-lg bg-secondary flex items-center justify-center shrink-0">
              <Calendar className="w-4 h-4 text-muted-foreground" />
            </div>
            <div>
              <p className="font-medium">{formatEventDate(event)}</p>
              <p className="text-sm text-muted-foreground flex items-center gap-1">
                <Clock className="w-3 h-3" />
                {formatEventTime(event)}
              </p>
            </div>
          </div>

          {/* Location */}
          {event.location && (
            <div className="flex items-start gap-3">
              <div className="w-8 h-8 rounded-lg bg-secondary flex items-center justify-center shrink-0">
                <MapPin className="w-4 h-4 text-muted-foreground" />
              </div>
              <div>
                <p className="font-medium">Location</p>
                <p className="text-sm text-muted-foreground">{event.location}</p>
              </div>
            </div>
          )}

          {/* Description */}
          {event.description && (
            <div className="flex items-start gap-3">
              <div className="w-8 h-8 rounded-lg bg-secondary flex items-center justify-center shrink-0">
                <FileText className="w-4 h-4 text-muted-foreground" />
              </div>
              <div className="flex-1 min-w-0">
                <p className="font-medium">Description</p>
                <div className="text-sm text-muted-foreground mt-1 whitespace-pre-wrap break-words max-h-40 overflow-y-auto">
                  {event.description}
                </div>
              </div>
            </div>
          )}

          {/* Actions */}
          <div className="flex gap-2 pt-4 border-t">
            <Button
              variant="outline"
              className="flex-1 gap-2"
              onClick={() => window.open(eventUrl, "_blank")}
            >
              <ExternalLink className="w-4 h-4" />
              Open in Google Calendar
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}