"use client";

import { create } from "zustand";
import { CreateRoomOptions, MatchmakingOptions, getService } from "./online/service";
import { pushNotification } from "./notification-store";
import {
  ChatMessage,
  Friend,
  FriendRequest,
  LeaderboardEntry,
  MatchmakingState,
  Room,
} from "./online/types";

interface OnlineStore {
  friends: Friend[];
  requests: FriendRequest[];
  room: Room | null;
  matchmaking: MatchmakingState;
  leaderboard: LeaderboardEntry[];

  loadFriends: () => Promise<void>;
  addFriend: (q: string) => Promise<{ ok: boolean; messageFa: string; messageEn: string }>;
  acceptRequest: (id: string) => Promise<void>;
  declineRequest: (id: string) => Promise<void>;
  removeFriend: (id: string) => Promise<void>;

  createRoom: (opts: CreateRoomOptions) => Promise<void>;
  setPartner: (friendId: string | null) => Promise<void>;
  inviteToSeat: (seat: 1 | 3, friendId: string) => Promise<void>;
  addBot: (seat: 1 | 2 | 3) => Promise<void>;
  clearSeat: (seat: 1 | 2 | 3) => Promise<void>;
  startRoom: () => Promise<void>;
  leaveRoom: () => Promise<void>;
  acceptInvite: () => Promise<void>;
  declineInvite: () => Promise<void>;

  startMatchmaking: (opts: MatchmakingOptions) => Promise<void>;
  cancelMatchmaking: () => Promise<void>;

  loadLeaderboard: () => Promise<void>;

  // chat
  activeChatFriend: Friend | null;
  chatMessages: ChatMessage[];
  unread: number; // total unread messages across conversations (for nav badge)
  openChat: (friend: Friend) => Promise<void>;
  sendChat: (text: string) => Promise<void>;
  closeChat: () => void;
  refreshUnread: () => Promise<void>;
}

let roomUnsub: (() => void) | null = null;
let mmUnsub: (() => void) | null = null;
let friendUnsub: (() => void) | null = null;
let chatUnsub: (() => void) | null = null;
const seenRequests = new Set<string>();

export const useOnlineStore = create<OnlineStore>((set, get) => ({
  friends: [],
  requests: [],
  room: null,
  matchmaking: { phase: "idle", players: [], elapsedMs: 0, ranked: true, stake: 0 },
  leaderboard: [],

  loadFriends: async () => {
    const svc = getService();
    const [friends, requests] = await Promise.all([svc.listFriends(), svc.listRequests()]);
    set({ friends, requests });
    for (const r of requests) {
      if (seenRequests.has(r.id)) continue;
      seenRequests.add(r.id);
      pushNotification({
        kind: "friend_request",
        titleFa: "درخواست دوستی جدید",
        titleEn: "New friend request",
        bodyFa: r.from.displayName,
        bodyEn: r.from.displayName,
        icon: "👥",
      });
    }
    if (!friendUnsub) friendUnsub = svc.onFriends((f) => set({ friends: f }));
  },

  addFriend: async (q) => {
    const res = await getService().addFriend(q);
    if (res.ok) await get().loadFriends();
    return res;
  },
  acceptRequest: async (id) => {
    await getService().acceptRequest(id);
    const requests = await getService().listRequests();
    set({ requests });
  },
  declineRequest: async (id) => {
    await getService().declineRequest(id);
    set({ requests: get().requests.filter((r) => r.id !== id) });
  },
  removeFriend: async (id) => {
    await getService().removeFriend(id);
  },

  createRoom: async (opts) => {
    const svc = getService();
    const room = await svc.createRoom(opts);
    set({ room });
    if (roomUnsub) roomUnsub();
    roomUnsub = svc.onRoom((r) => set({ room: { ...r } }));
  },
  setPartner: async (friendId) => {
    const r = await getService().setPartner(get().room!.id, friendId);
    set({ room: { ...r } });
  },
  inviteToSeat: async (seat, friendId) => {
    const r = await getService().inviteToSeat(get().room!.id, seat, friendId);
    set({ room: { ...r } });
  },
  addBot: async (seat) => {
    const r = await getService().addBot(get().room!.id, seat);
    set({ room: { ...r } });
  },
  clearSeat: async (seat) => {
    const r = await getService().clearSeat(get().room!.id, seat);
    set({ room: { ...r } });
  },
  startRoom: async () => {
    const r = await getService().startRoom(get().room!.id);
    set({ room: { ...r } });
  },
  leaveRoom: async () => {
    if (get().room) await getService().leaveRoom(get().room!.id);
    if (roomUnsub) {
      roomUnsub();
      roomUnsub = null;
    }
    set({ room: null });
  },
  acceptInvite: async () => {
    const svc = getService();
    if (roomUnsub) roomUnsub();
    roomUnsub = svc.onRoom((r) => set({ room: { ...r } })); // subscribe first so we catch the room push
    await svc.acceptInvite();
  },
  declineInvite: async () => {
    await getService().declineInvite();
  },

  startMatchmaking: async (opts) => {
    const svc = getService();
    if (mmUnsub) mmUnsub();
    mmUnsub = svc.onMatchmaking((s) => set({ matchmaking: s }));
    await svc.startMatchmaking(opts);
  },
  cancelMatchmaking: async () => {
    await getService().cancelMatchmaking();
    if (mmUnsub) {
      mmUnsub();
      mmUnsub = null;
    }
    set({ matchmaking: { phase: "idle", players: [], elapsedMs: 0, ranked: true, stake: 0 } });
  },

  loadLeaderboard: async () => {
    const leaderboard = await getService().getLeaderboard();
    set({ leaderboard });
  },

  activeChatFriend: null,
  chatMessages: [],
  unread: 0,

  refreshUnread: async () => {
    try {
      const convs = await getService().listConversations();
      set({ unread: convs.reduce((n, c) => n + (c.unread ?? 0), 0) });
    } catch {
      /* ignore */
    }
  },

  openChat: async (friend) => {
    const svc = getService();
    set({ activeChatFriend: friend, chatMessages: await svc.getMessages(friend.id) });
    await svc.markRead(friend.id);
    get().refreshUnread();
    if (chatUnsub) chatUnsub();
    chatUnsub = svc.onChat((friendId, msgs) => {
      const active = get().activeChatFriend;
      if (active && active.id === friendId) {
        set({ chatMessages: msgs });
        svc.markRead(friendId);
      }
    });
  },

  sendChat: async (text) => {
    const friend = get().activeChatFriend;
    if (!friend || !text.trim()) return;
    await getService().sendMessage(friend.id, text);
    set({ chatMessages: await getService().getMessages(friend.id) });
  },

  closeChat: () => {
    if (chatUnsub) {
      chatUnsub();
      chatUnsub = null;
    }
    set({ activeChatFriend: null, chatMessages: [] });
    get().refreshUnread();
  },
}));