"use client"

import { useRouter } from "next/navigation"
import Link from "next/link"
import { toast } from "sonner"
import {
  Check,
  CircleHelp,
  Mail,
  MapPin,
  Pencil,
  Repeat,
  Trash2,
  Users,
  X,
} from "lucide-react"
import { AgendaFloatingCard, type AnchorRect } from "@/components/agenda/agenda-floating-card"
import { AgendaVideoProviderIcon } from "@/components/agenda/agenda-video-provider-icon"
import { ContactAvatar } from "@/components/gmail/contacts/contact-avatar"
import { Button } from "@/components/ui/button"
import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip"
import {
  useDeleteAgendaEvent,
  useRespondAgendaInvitation,
} from "@/lib/api/hooks/use-calendar-mutations"
import { formatEventRange } from "@/lib/agenda/agenda-date"
import { isUltiMeetUrl, meetJoinPath } from "@/lib/meet/meet-url"
import { describeRRule } from "@/lib/agenda/agenda-recurrence"
import { stashPendingCompose } from "@/lib/agenda/agenda-mail-compose"
import type { AgendaCalendar, AgendaEvent } from "@/lib/agenda/agenda-types"
import { cn } from "@/lib/utils"

export interface AgendaEventPopoverState {
  event: AgendaEvent
  anchor: AnchorRect
}

const STATUS_LABELS: Record<string, string> = {
  ACCEPTED: "accepté",
  DECLINED: "refusé",
  TENTATIVE: "peut-être",
  "NEEDS-ACTION": "en attente",
}

export function AgendaEventPopover({
  state,
  calendars,
  userEmail,
  onClose,
  onEdit,
}: {
  state: AgendaEventPopoverState | null
  calendars: AgendaCalendar[]
  userEmail?: string
  onClose: () => void
  onEdit: (event: AgendaEvent) => void
}) {
  const router = useRouter()
  const deleteMutation = useDeleteAgendaEvent()
  const respondMutation = useRespondAgendaInvitation()

  if (!state) return null
  const { event, anchor } = state
  const calendar = calendars.find((c) => c.id === event.calendarId)

  const selfAttendee = userEmail
    ? event.attendees.find((a) => a.email.toLowerCase() === userEmail.toLowerCase())
    : undefined

  const remove = async () => {
    try {
      await deleteMutation.mutateAsync({ path: event.path })
      toast.success("Événement supprimé")
      onClose()
    } catch {
      toast.error("Impossible de supprimer l'événement")
    }
  }

  const respond = async (response: "accepted" | "declined" | "tentative") => {
    try {
      await respondMutation.mutateAsync({ path: event.path, response, etag: event.etag })
      toast.success("Réponse enregistrée")
      onClose()
    } catch {
      toast.error("Impossible d'enregistrer la réponse")
    }
  }

  const emailGuests = () => {
    const recipients = event.attendees
      .filter((a) => a.email.toLowerCase() !== (userEmail ?? "").toLowerCase())
      .map((a) => ({ name: a.name ?? a.email, email: a.email }))
    if (event.organizer && event.organizer.toLowerCase() !== (userEmail ?? "").toLowerCase()) {
      if (!recipients.some((r) => r.email.toLowerCase() === event.organizer.toLowerCase())) {
        recipients.push({ name: event.organizer, email: event.organizer })
      }
    }
    stashPendingCompose({ to: recipients, subject: event.title })
    router.push("/mail")
  }

  return (
    <AgendaFloatingCard anchor={anchor} onClose={onClose} width={420}>
      <div className="flex flex-col gap-3 overflow-y-auto px-5 pt-4 pb-5">
        {/* Titre + actions */}
        <div className="flex items-start gap-2">
          <span
            aria-hidden
            className="mt-1.5 size-4 shrink-0 rounded-[5px]"
            style={{ backgroundColor: event.color }}
          />
          <div className="min-w-0 flex-1">
            <h2 className="text-[1.3rem] leading-snug font-normal break-words text-foreground">
              {event.title}
            </h2>
            <p className="text-sm text-muted-foreground">
              {formatEventRange(event.start, event.end, event.allDay)}
            </p>
          </div>
          <div className="flex shrink-0 items-center gap-0.5">
            <Tooltip>
              <TooltipTrigger asChild>
                <Button
                  variant="ghost"
                  size="icon"
                  className="size-8 rounded-full text-muted-foreground"
                  aria-label="Modifier"
                  onClick={() => {
                    onEdit(event)
                  }}
                >
                  <Pencil className="size-4" />
                </Button>
              </TooltipTrigger>
              <TooltipContent>Modifier</TooltipContent>
            </Tooltip>
            <Tooltip>
              <TooltipTrigger asChild>
                <Button
                  variant="ghost"
                  size="icon"
                  className="size-8 rounded-full text-muted-foreground"
                  aria-label="Supprimer"
                  disabled={deleteMutation.isPending}
                  onClick={() => void remove()}
                >
                  <Trash2 className="size-4" />
                </Button>
              </TooltipTrigger>
              <TooltipContent>Supprimer</TooltipContent>
            </Tooltip>
            {event.attendees.length > 0 && (
              <Tooltip>
                <TooltipTrigger asChild>
                  <Button
                    variant="ghost"
                    size="icon"
                    className="size-8 rounded-full text-muted-foreground"
                    aria-label="Envoyer un email aux invités"
                    onClick={emailGuests}
                  >
                    <Mail className="size-4" />
                  </Button>
                </TooltipTrigger>
                <TooltipContent>Envoyer un email aux invités</TooltipContent>
              </Tooltip>
            )}
            <Button
              variant="ghost"
              size="icon"
              className="size-8 rounded-full text-muted-foreground"
              aria-label="Fermer"
              onClick={onClose}
            >
              <X className="size-4" />
            </Button>
          </div>
        </div>

        {event.recurring && (
          <Row icon={<Repeat className="size-4.5" />}>
            {describeRRule(event.rrule)}
          </Row>
        )}

        {event.meetUrl && (
          <Row
            icon={<AgendaVideoProviderIcon provider="ultimeet" className="size-4.5" />}
          >
            <Button asChild className="h-9 rounded-full">
              {isUltiMeetUrl(event.meetUrl) ? (
                <Link href={meetJoinPath(event.meetUrl)}>Rejoindre la visio</Link>
              ) : (
                <a href={event.meetUrl} target="_blank" rel="noopener noreferrer">
                  Rejoindre la visio
                </a>
              )}
            </Button>
          </Row>
        )}

        {event.location && (
          <Row icon={<MapPin className="size-4.5" />}>
            <span className="break-words">{event.location}</span>
          </Row>
        )}

        {event.attendees.length > 0 && (
          <Row icon={<Users className="size-4.5" />} alignTop>
            <div className="flex w-full flex-col gap-1.5">
              <span className="text-sm text-foreground/85">
                {event.attendees.length} invité
                {event.attendees.length > 1 ? "s" : ""}
              </span>
              {event.attendees.map((a) => (
                <div key={a.email} className="flex items-center gap-2.5">
                  <div className="relative">
                    <ContactAvatar name={a.name || a.email} email={a.email} size="xs" />
                    {a.status === "ACCEPTED" && (
                      <span className="absolute -right-0.5 -bottom-0.5 flex size-3.5 items-center justify-center rounded-full bg-green-600 text-white ring-2 ring-popover">
                        <Check className="size-2.5" />
                      </span>
                    )}
                    {a.status === "DECLINED" && (
                      <span className="absolute -right-0.5 -bottom-0.5 flex size-3.5 items-center justify-center rounded-full bg-red-600 text-white ring-2 ring-popover">
                        <X className="size-2.5" />
                      </span>
                    )}
                    {a.status === "TENTATIVE" && (
                      <span className="absolute -right-0.5 -bottom-0.5 flex size-3.5 items-center justify-center rounded-full bg-amber-500 text-white ring-2 ring-popover">
                        <CircleHelp className="size-2.5" />
                      </span>
                    )}
                  </div>
                  <span className="min-w-0">
                    <span className="block truncate text-sm">
                      {a.name || a.email}
                      {event.organizer &&
                        a.email.toLowerCase() === event.organizer.toLowerCase() && (
                          <span className="text-muted-foreground"> — organisateur</span>
                        )}
                    </span>
                    <span className="block truncate text-xs text-muted-foreground">
                      {STATUS_LABELS[a.status ?? "NEEDS-ACTION"] ?? a.status?.toLowerCase()}
                    </span>
                  </span>
                </div>
              ))}
            </div>
          </Row>
        )}

        {event.description && (
          <Row
            icon={<span className="block w-4.5" aria-hidden />}
            alignTop
          >
            <p className="text-sm break-words whitespace-pre-wrap text-foreground/80">
              {event.description}
            </p>
          </Row>
        )}

        {calendar && (
          <Row
            icon={
              <span
                aria-hidden
                className="block size-3.5 rounded-full"
                style={{ backgroundColor: event.color }}
              />
            }
          >
            <span className="text-sm text-foreground/80">{calendar.display_name}</span>
          </Row>
        )}

        {/* RSVP */}
        {selfAttendee && (
          <div className="mt-1 flex items-center justify-between gap-2 border-t border-border/60 pt-3">
            <span className="text-sm text-foreground/85">Vous participez ?</span>
            <div className="flex gap-1">
              {(
                [
                  ["accepted", "Oui", "ACCEPTED"],
                  ["tentative", "Peut-être", "TENTATIVE"],
                  ["declined", "Non", "DECLINED"],
                ] as const
              ).map(([value, label, partstat]) => (
                <Button
                  key={value}
                  variant={selfAttendee.status === partstat ? "default" : "outline"}
                  className={cn("h-8 rounded-full px-3 text-xs")}
                  disabled={respondMutation.isPending}
                  onClick={() => void respond(value)}
                >
                  {label}
                </Button>
              ))}
            </div>
          </div>
        )}
      </div>
    </AgendaFloatingCard>
  )
}

function Row({
  icon,
  children,
  alignTop,
}: {
  icon: React.ReactNode
  children: React.ReactNode
  alignTop?: boolean
}) {
  return (
    <div className={cn("flex gap-3.5", alignTop ? "items-start" : "items-center")}>
      <span
        className={cn(
          "flex w-4 shrink-0 justify-center text-muted-foreground",
          alignTop && "mt-0.5",
        )}
      >
        {icon}
      </span>
      <div className="min-w-0 flex-1 text-sm text-foreground/85">{children}</div>
    </div>
  )
}
