"use client";

import { useState } from "react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { ScrollArea } from "@/components/ui/scroll-area";
import { useCompanyUsers, useCreateRoom } from "@/hooks/useMessenger";
import { useMessengerContext } from "@/contexts/MessengerContext";
import { UserAvatar } from "./UserAvatar";
import { Check } from "lucide-react";
import { cn } from "@/lib/utils";
import type { UserStatus } from "@/hooks/useMessengerSocket";

interface NewRoomModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  userStatuses: Map<string, UserStatus>;
}

export function NewRoomModal({ open, onOpenChange, userStatuses }: NewRoomModalProps) {
  const [tab, setTab] = useState<"dm" | "group" | "channel">("dm");
  const [search, setSearch] = useState("");
  const [selectedIds, setSelectedIds] = useState<string[]>([]);
  const [roomName, setRoomName] = useState("");
  const [channelDesc, setChannelDesc] = useState("");

  const { data: users = [] } = useCompanyUsers();
  const createRoom = useCreateRoom();
  const { selectRoom } = useMessengerContext();

  const filtered = users.filter(
    (u) =>
      u.userName.toLowerCase().includes(search.toLowerCase()) ||
      (u.deptName && u.deptName.toLowerCase().includes(search.toLowerCase()))
  );

  const toggleUser = (userId: string) => {
    if (tab === "dm") {
      setSelectedIds([userId]);
    } else {
      setSelectedIds((prev) =>
        prev.includes(userId) ? prev.filter((id) => id !== userId) : [...prev, userId]
      );
    }
  };

  const handleCreate = async () => {
    try {
      const room = await createRoom.mutateAsync({
        type: tab,
        name: tab === "channel" ? roomName : tab === "group" ? roomName : undefined,
        description: tab === "channel" ? channelDesc : undefined,
        participantIds: selectedIds,
      });
      selectRoom(room.id);
      onOpenChange(false);
      reset();
    } catch {
      // handled by query
    }
  };

  const reset = () => {
    setSearch("");
    setSelectedIds([]);
    setRoomName("");
    setChannelDesc("");
  };

  const canCreate =
    selectedIds.length > 0 &&
    (tab === "dm" || tab === "group" || (tab === "channel" && roomName.trim()));

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-md">
        <DialogHeader>
          <DialogTitle>새 대화</DialogTitle>
        </DialogHeader>

        <Tabs value={tab} onValueChange={(v) => { setTab(v as typeof tab); reset(); }}>
          <TabsList className="w-full">
            <TabsTrigger value="dm" className="flex-1">DM</TabsTrigger>
            <TabsTrigger value="group" className="flex-1">그룹</TabsTrigger>
            <TabsTrigger value="channel" className="flex-1">채널</TabsTrigger>
          </TabsList>

          {(tab === "group" || tab === "channel") && (
            <div className="mt-3 space-y-2">
              <Input
                placeholder={tab === "group" ? "그룹 이름" : "채널 이름"}
                value={roomName}
                onChange={(e) => setRoomName(e.target.value)}
              />
              {tab === "channel" && (
                <Input
                  placeholder="채널 설명 (선택)"
                  value={channelDesc}
                  onChange={(e) => setChannelDesc(e.target.value)}
                />
              )}
            </div>
          )}

          <TabsContent value={tab} className="mt-3">
            <Input
              placeholder="사용자 검색..."
              value={search}
              onChange={(e) => setSearch(e.target.value)}
              className="mb-2"
            />

            {selectedIds.length > 0 && tab !== "dm" && (
              <div className="flex flex-wrap gap-1 mb-2">
                {selectedIds.map((id) => {
                  const u = users.find((x) => x.userId === id);
                  return u ? (
                    <span
                      key={id}
                      onClick={() => toggleUser(id)}
                      className="inline-flex items-center gap-1 rounded-full bg-primary/10 text-primary text-xs px-2 py-0.5 cursor-pointer hover:bg-primary/20"
                    >
                      {u.userName} &times;
                    </span>
                  ) : null;
                })}
              </div>
            )}

            <ScrollArea className="h-60">
              {filtered.map((u) => {
                const selected = selectedIds.includes(u.userId);
                return (
                  <button
                    key={u.userId}
                    onClick={() => toggleUser(u.userId)}
                    className={cn(
                      "w-full flex items-center gap-2 px-2 py-1.5 rounded hover:bg-muted text-left",
                      selected && "bg-accent"
                    )}
                  >
                    <UserAvatar photo={u.photo} name={u.userName} size="sm" status={userStatuses.get(u.userId) ?? "offline"} />
                    <div className="flex-1 min-w-0">
                      <div className="text-sm font-medium truncate">{u.userName}</div>
                      {u.deptName && (
                        <div className="text-xs text-muted-foreground truncate">
                          {u.deptName} {u.positionName && `/ ${u.positionName}`}
                        </div>
                      )}
                    </div>
                    {selected && <Check className="h-4 w-4 text-primary shrink-0" />}
                  </button>
                );
              })}
            </ScrollArea>
          </TabsContent>
        </Tabs>

        <div className="flex justify-end mt-2">
          <Button onClick={handleCreate} disabled={!canCreate || createRoom.isPending} size="sm">
            {createRoom.isPending ? "생성 중..." : "대화 시작"}
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}