import { ref, computed, watch } from "vue";
import { useQuery, useMutation } from "@vue/apollo-composable";
import { MeQueryDocument, LogoutMutationDocument } from "~~/graphql/generated";

type TelegramConnectStatus =
  | "not_connected"
  | "pending_link"
  | "pending_business_connection"
  | "connected"
  | "disabled"
  | "no_reply_rights";

type TelegramConnectionSummary = {
  businessConnectionId: string;
  isEnabled: boolean | null;
  canReply: boolean | null;
  updatedAt: string;
};

export function useAuth() {
  // -------------------------------------------------------------------------
  // Auth state
  // -------------------------------------------------------------------------
  const authMe = ref<{
    user: { id: string; phone: string; name: string };
    team: { id: string; name: string };
    conversation: { id: string; title: string };
  } | null>(null);

  const authResolved = ref(false);

  const apolloAuthReady = computed(() => !!authMe.value);

  // -------------------------------------------------------------------------
  // Apollo: Me query
  // -------------------------------------------------------------------------
  const { result: meResult, refetch: refetchMe, loading: meLoading } = useQuery(
    MeQueryDocument,
    null,
    { fetchPolicy: "network-only" },
  );

  watch(() => meResult.value?.me, (me) => {
    if (me) authMe.value = me as typeof authMe.value;
  }, { immediate: true });

  // -------------------------------------------------------------------------
  // Apollo: Logout mutation
  // -------------------------------------------------------------------------
  const { mutate: doLogout } = useMutation(LogoutMutationDocument);

  // -------------------------------------------------------------------------
  // loadMe / logout
  // -------------------------------------------------------------------------
  async function loadMe() {
    const result = await refetchMe();
    const me = result?.data?.me;
    if (me) authMe.value = me as typeof authMe.value;
  }

  async function logout() {
    await doLogout();
    authMe.value = null;
    telegramConnectStatus.value = "not_connected";
    telegramConnections.value = [];
    telegramConnectUrl.value = "";
    if (process.client) {
      await navigateTo("/login", { replace: true });
    }
  }

  // -------------------------------------------------------------------------
  // Telegram connect state
  // -------------------------------------------------------------------------
  const telegramConnectStatus = ref<TelegramConnectStatus>("not_connected");
  const telegramConnectStatusLoading = ref(false);
  const telegramConnectBusy = ref(false);
  const telegramConnectUrl = ref("");
  const telegramConnections = ref<TelegramConnectionSummary[]>([]);
  const telegramConnectNotice = ref("");

  const telegramStatusLabel = computed(() => {
    if (telegramConnectStatusLoading.value) return "Checking";
    if (telegramConnectStatus.value === "connected") return "Connected";
    if (telegramConnectStatus.value === "pending_link") return "Pending link";
    if (telegramConnectStatus.value === "pending_business_connection") return "Waiting business connect";
    if (telegramConnectStatus.value === "disabled") return "Disabled";
    if (telegramConnectStatus.value === "no_reply_rights") return "No reply rights";
    return "Not connected";
  });

  const telegramStatusBadgeClass = computed(() => {
    if (telegramConnectStatus.value === "connected") return "badge-success";
    if (telegramConnectStatus.value === "pending_link" || telegramConnectStatus.value === "pending_business_connection") return "badge-warning";
    if (telegramConnectStatus.value === "disabled" || telegramConnectStatus.value === "no_reply_rights") return "badge-error";
    return "badge-ghost";
  });

  // -------------------------------------------------------------------------
  // Telegram connect functions
  // -------------------------------------------------------------------------
  async function loadTelegramConnectStatus() {
    if (!authMe.value) {
      telegramConnectStatus.value = "not_connected";
      telegramConnections.value = [];
      telegramConnectUrl.value = "";
      return;
    }

    telegramConnectStatusLoading.value = true;
    try {
      const result = await $fetch<{
        ok: boolean;
        status: TelegramConnectStatus;
        connections?: TelegramConnectionSummary[];
      }>("/api/omni/telegram/business/connect/status", {
        method: "GET",
      });
      telegramConnectStatus.value = result?.status ?? "not_connected";
      telegramConnections.value = result?.connections ?? [];
    } catch {
      telegramConnectStatus.value = "not_connected";
      telegramConnections.value = [];
    } finally {
      telegramConnectStatusLoading.value = false;
    }
  }

  async function startTelegramBusinessConnect() {
    if (telegramConnectBusy.value) return;
    telegramConnectBusy.value = true;
    try {
      const result = await $fetch<{
        ok: boolean;
        status: TelegramConnectStatus;
        connectUrl: string;
        expiresAt: string;
      }>("/api/omni/telegram/business/connect/start", { method: "POST" });
      telegramConnectStatus.value = result?.status ?? "pending_link";
      telegramConnectUrl.value = String(result?.connectUrl ?? "").trim();
      if (telegramConnectUrl.value && process.client) {
        window.location.href = telegramConnectUrl.value;
      }
    } catch {
      telegramConnectStatus.value = "not_connected";
    } finally {
      telegramConnectBusy.value = false;
      await loadTelegramConnectStatus();
    }
  }

  async function completeTelegramBusinessConnectFromToken(token: string) {
    const t = String(token || "").trim();
    if (!t) return;

    try {
      const result = await $fetch<{
        ok: boolean;
        status: string;
        businessConnectionId?: string;
      }>("/api/omni/telegram/business/connect/complete", {
        method: "POST",
        body: { token: t },
      });

      if (result?.ok) {
        telegramConnectStatus.value = "connected";
        telegramConnectNotice.value = "Telegram успешно привязан.";
        await loadTelegramConnectStatus();
        return;
      }

      if (result?.status === "awaiting_telegram_start") {
        telegramConnectNotice.value = "Сначала нажмите Start в Telegram, затем нажмите кнопку в боте снова.";
      } else if (result?.status === "invalid_or_expired_token") {
        telegramConnectNotice.value = "Ссылка привязки истекла. Нажмите Connect в CRM заново.";
      } else {
        telegramConnectNotice.value = "Не удалось завершить привязку. Запустите Connect заново.";
      }
    } catch {
      telegramConnectNotice.value = "Ошибка завершения привязки. Попробуйте снова.";
    }
  }

  return {
    authMe,
    authResolved,
    apolloAuthReady,
    meLoading,
    loadMe,
    logout,
    // telegram
    telegramConnectStatus,
    telegramConnectStatusLoading,
    telegramConnectBusy,
    telegramConnectUrl,
    telegramConnections,
    telegramConnectNotice,
    telegramStatusLabel,
    telegramStatusBadgeClass,
    loadTelegramConnectStatus,
    startTelegramBusinessConnect,
    completeTelegramBusinessConnectFromToken,
  };
}