import { useState, useEffect } from "react";
import { useSession } from "next-auth/react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Label } from "@/components/ui/label";
import { Checkbox } from "@/components/ui/checkbox";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import { format, parseISO } from "date-fns";
import { fr } from "date-fns/locale";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Calendar as CalendarType } from "@prisma/client";

interface EventDialogProps {
  open: boolean;
  event?: any;
  onClose: () => void;
  onSave: (eventData: any) => Promise<void>;
  onDelete?: (eventId: string) => Promise<void>;
  calendars: CalendarType[];
}

export function EventDialog({
  open,
  event,
  onClose,
  onSave,
  onDelete,
  calendars,
}: EventDialogProps) {
  const [title, setTitle] = useState(event?.title || "");
  const [description, setDescription] = useState(event?.description || "");
  const [location, setLocation] = useState(event?.location || "");
  const [start, setStart] = useState(event?.start || "");
  const [end, setEnd] = useState(event?.end || "");
  const [allDay, setAllDay] = useState(event?.allDay || false);
  const [calendarId, setCalendarId] = useState(event?.calendarId || "");
  const [confirmDelete, setConfirmDelete] = useState(false);
  const [isVideoConference, setIsVideoConference] = useState(!!event?.location?.includes('vision.slm-lab.net') || !!event?.location?.includes('jitsi'));
  const { data: session } = useSession();
  const [groups, setGroups] = useState<Array<{ id: string; name: string }>>([]);
  const [missions, setMissions] = useState<Array<{ id: string; name: string }>>([]);

  // Reset form when event changes
  useEffect(() => {
    if (event) {
      setTitle(event.title || "");
      setDescription(event.description || "");
      setLocation(event.location || "");
      setStart(event.start || "");
      setEnd(event.end || "");
      setAllDay(event.allDay || false);
      setCalendarId(event.calendarId || "");
      setIsVideoConference(!!event.location?.includes('vision.slm-lab.net') || !!event.location?.includes('jitsi'));
    } else {
      // Reset form for new event
      setTitle("");
      setDescription("");
      setLocation("");
      setStart("");
      setEnd("");
      setAllDay(false);
      setCalendarId("");
      setIsVideoConference(false);
    }
  }, [event]);

  // Fetch groups and missions when dialog opens
  useEffect(() => {
    if (open && session?.user?.id) {
      const fetchData = async () => {
        try {
          // Fetch groups
          const groupsRes = await fetch(`/api/users/${session.user.id}/groups`);
          if (groupsRes.ok) {
            const groupsData = await groupsRes.json();
            setGroups(Array.isArray(groupsData) ? groupsData : []);
          }

          // Fetch missions
          const missionsRes = await fetch("/api/missions?limit=1000");
          if (missionsRes.ok) {
            const missionsData = await missionsRes.json();
            const allMissions = missionsData.missions || [];
            // Filter missions where user is creator or member
            const userMissions = allMissions.filter((mission: any) => {
              const isCreator = mission.creator?.id === session.user.id;
              const isMember = mission.missionUsers?.some(
                (mu: any) => mu.user?.id === session.user.id
              );
              return isCreator || isMember;
            });
            setMissions(userMissions);
          }
        } catch (error) {
          console.error("Error fetching groups/missions:", error);
        }
      };
      fetchData();
    }
  }, [open, session]);

  // Formater les dates pour l'affichage
  const formatDate = (dateStr: string) => {
    if (!dateStr) return "";
    try {
      // @ts-ignore
      const date = parseISO(dateStr);
      // @ts-ignore
      return format(date, allDay ? "yyyy-MM-dd" : "yyyy-MM-dd'T'HH:mm", {
        // @ts-ignore
        locale: fr,
      });
    } catch (e) {
      return dateStr;
    }
  };

  // Gérer le changement de l'option "Toute la journée"
  const handleAllDayChange = (checked: boolean) => {
    setAllDay(checked);

    // Ajuster les dates si nécessaire
    if (checked && start) {
      // @ts-ignore
      const startDate = parseISO(start);
      // @ts-ignore
      setStart(format(startDate, "yyyy-MM-dd"));

      if (end) {
        // @ts-ignore
        const endDate = parseISO(end);
        // @ts-ignore
        setEnd(format(endDate, "yyyy-MM-dd"));
      }
    }
  };

  // Generate Jitsi URL based on calendar type
  const generateJitsiUrl = (): string => {
    const selectedCalendar = calendars.find(cal => cal.id === calendarId);
    if (!selectedCalendar) return "";

    const baseUrl = process.env.NEXT_PUBLIC_IFRAME_CONFERENCE_URL || 'https://vision.slm-lab.net';
    const calendarName = selectedCalendar.name || "";

    // Check if it's a Group calendar
    if (calendarName.startsWith("Groupe:")) {
      const groupName = calendarName.replace("Groupe: ", "");
      // Find matching group by name to get the real ID
      const matchingGroup = groups.find((g: { id: string; name: string }) => g.name === groupName);
      if (matchingGroup) {
        return `${baseUrl}/Groupe-${matchingGroup.id}`;
      }
      // Fallback: use group name as ID (same as vision page fallback)
      const groupId = groupName.toLowerCase().replace(/\s+/g, '-');
      return `${baseUrl}/Groupe-${groupId}`;
    }

    // Check if it's a Mission calendar
    if (calendarName.startsWith("Mission:")) {
      // Use missionId from calendar if available (most reliable)
      const missionId = (selectedCalendar as any).missionId;
      if (missionId) {
        return `${baseUrl}/${missionId}`;
      }
      // Fallback: find matching mission by name
      const missionName = calendarName.replace("Mission: ", "");
      const matchingMission = missions.find((m: { id: string; name: string }) => m.name === missionName);
      if (matchingMission) {
        return `${baseUrl}/${matchingMission.id}`;
      }
      // Last fallback: use mission name as ID
      const missionIdFromName = missionName.toLowerCase().replace(/\s+/g, '-');
      return `${baseUrl}/${missionIdFromName}`;
    }

    // For "Mon Calendrier" or Microsoft calendars, generate a generic Jitsi room
    // Use a combination of user ID and timestamp for uniqueness
    const userId = session?.user?.id || 'user';
    const timestamp = Date.now();
    const randomId = Math.random().toString(36).substring(2, 9);
    return `${baseUrl}/${randomId}-${timestamp}`;
  };

  // Handle video conference checkbox change
  const handleVideoConferenceChange = (checked: boolean) => {
    setIsVideoConference(checked);
    if (checked) {
      // Generate Jitsi URL and set it in location
      const jitsiUrl = generateJitsiUrl();
      setLocation(jitsiUrl);
    } else {
      // Clear location if unchecking
      setLocation("");
    }
  };

  // Update location when calendar changes and video conference is checked
  useEffect(() => {
    if (isVideoConference && calendarId) {
      const jitsiUrl = generateJitsiUrl();
      setLocation(jitsiUrl);
    }
  }, [calendarId, isVideoConference]);

  // Update location when groups/missions are loaded (to get correct IDs for groups/missions)
  useEffect(() => {
    if (isVideoConference && calendarId) {
      const selectedCalendar = calendars.find(cal => cal.id === calendarId);
      if (selectedCalendar) {
        const calendarName = selectedCalendar.name || "";
        const isGroup = calendarName.startsWith("Groupe:");
        const isMission = calendarName.startsWith("Mission:");
        
        // Only update if it's a group/mission and we now have the data
        if ((isGroup && groups.length > 0) || (isMission && missions.length > 0)) {
          const jitsiUrl = generateJitsiUrl();
          setLocation(jitsiUrl);
        }
      }
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [groups.length, missions.length]);

  // Enregistrer l'événement
  const handleSave = () => {
    onSave({
      id: event?.id,
      title,
      description,
      location,
      start,
      end,
      calendarId,
      isAllDay: allDay,
    });
  };

  // Supprimer l'événement
  const handleDelete = () => {
    if (onDelete && event?.id) {
      onDelete(event.id);
    }
  };

  return (
    <>
      <Dialog open={open} onOpenChange={onClose}>
        <DialogContent className='sm:max-w-[550px]'>
          <DialogHeader>
            <DialogTitle>
              {event?.id ? "Modifier l'événement" : "Nouvel événement"}
            </DialogTitle>
          </DialogHeader>

          <div className='grid gap-4 py-4'>
            <div className='grid gap-2'>
              <Label htmlFor='title'>Titre *</Label>
              <Input
                id='title'
                value={title}
                onChange={(e) => setTitle(e.target.value)}
                placeholder='Ajouter un titre'
                required
              />
            </div>

            {/* Sélection du calendrier */}
            <div className='grid gap-2'>
              <Label htmlFor='calendar'>Calendrier *</Label>
              <Select value={calendarId} onValueChange={setCalendarId} required>
                <SelectTrigger>
                  <SelectValue placeholder='Sélectionner un calendrier' />
                </SelectTrigger>
                <SelectContent>
                  {calendars.map((calendar) => (
                    <SelectItem key={calendar.id} value={calendar.id}>
                      <div className='flex items-center gap-2'>
                        <div
                          className='w-3 h-3 rounded-full'
                          style={{ backgroundColor: calendar.color }}
                        />
                        <span>{calendar.name}</span>
                      </div>
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>

            <div className='grid grid-cols-2 gap-4'>
              <div className='grid gap-2'>
                <Label htmlFor='start-date'>Début *</Label>
                <Input
                  type={allDay ? "date" : "datetime-local"}
                  id='start-date'
                  value={formatDate(start)}
                  onChange={(e) => setStart(e.target.value)}
                  required
                />
              </div>

              <div className='grid gap-2'>
                <Label htmlFor='end-date'>Fin *</Label>
                <Input
                  type={allDay ? "date" : "datetime-local"}
                  id='end-date'
                  value={formatDate(end)}
                  onChange={(e) => setEnd(e.target.value)}
                  required
                />
              </div>
            </div>

            <div className='flex items-center gap-2'>
              <Checkbox
                id='all-day'
                checked={allDay}
                onCheckedChange={handleAllDayChange}
              />
              <Label htmlFor='all-day'>Toute la journée</Label>
            </div>

            <div className='flex items-center gap-2'>
              <Checkbox
                id='video-conference'
                checked={isVideoConference}
                onCheckedChange={handleVideoConferenceChange}
                disabled={!calendarId}
              />
              <Label htmlFor='video-conference'>Visioconférence</Label>
            </div>

            <div className='grid gap-2'>
              <Label htmlFor='location'>Lieu (optionnel)</Label>
              <Input
                id='location'
                value={location}
                onChange={(e) => setLocation(e.target.value)}
                placeholder={isVideoConference ? 'Lien Jitsi généré automatiquement' : 'Ajouter un lieu'}
                disabled={isVideoConference}
              />
            </div>

            <div className='grid gap-2'>
              <Label htmlFor='description'>Description (optionnel)</Label>
              <Textarea
                id='description'
                value={description}
                onChange={(e) => setDescription(e.target.value)}
                placeholder='Ajouter une description'
                rows={3}
              />
            </div>
          </div>

          <DialogFooter>
            {event?.id && onDelete && (
              <Button
                variant='destructive'
                onClick={() => setConfirmDelete(true)}
                type='button'
              >
                Supprimer
              </Button>
            )}
            <Button variant='outline' onClick={onClose} type='button'>
              Annuler
            </Button>
            <Button
              onClick={handleSave}
              disabled={!title || !start || !end || !calendarId}
              type='button'
            >
              Enregistrer
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>

      <AlertDialog open={confirmDelete} onOpenChange={setConfirmDelete}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Supprimer l'événement</AlertDialogTitle>
            <AlertDialogDescription>
              Êtes-vous sûr de vouloir supprimer cet événement ? Cette action
              est irréversible.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Annuler</AlertDialogCancel>
            <AlertDialogAction onClick={handleDelete}>
              Supprimer
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </>
  );
}