import { ref, watch, type ComputedRef } from "vue";
import { useQuery, useMutation } from "@vue/apollo-composable";
import {
  ContactInboxesQueryDocument,
  SetContactInboxHiddenDocument,
} from "~~/graphql/generated";
import type { ContactInbox } from "~/composables/crm-types";

export function useContactInboxes(opts: { apolloAuthReady: ComputedRef<boolean> }) {
  const { result: contactInboxesResult, refetch: refetchContactInboxes } = useQuery(
    ContactInboxesQueryDocument,
    null,
    { enabled: opts.apolloAuthReady },
  );

  const { mutate: doSetContactInboxHidden } = useMutation(SetContactInboxHiddenDocument, {
    refetchQueries: [{ query: ContactInboxesQueryDocument }],
    update: (cache, _result, { variables }) => {
      if (!variables) return;
      const existing = cache.readQuery({ query: ContactInboxesQueryDocument }) as { contactInboxes?: ContactInbox[] } | null;
      if (!existing?.contactInboxes) return;
      cache.writeQuery({
        query: ContactInboxesQueryDocument,
        data: {
          contactInboxes: existing.contactInboxes.map((inbox) =>
            inbox.id === variables.inboxId ? { ...inbox, isHidden: variables.hidden } : inbox,
          ),
        },
      });
    },
  });

  const contactInboxes = ref<ContactInbox[]>([]);
  const inboxToggleLoadingById = ref<Record<string, boolean>>({});

  watch(() => contactInboxesResult.value?.contactInboxes, (v) => {
    if (v) contactInboxes.value = v as ContactInbox[];
  }, { immediate: true });

  function isInboxToggleLoading(inboxId: string) {
    return Boolean(inboxToggleLoadingById.value[inboxId]);
  }

  async function setInboxHidden(inboxId: string, hidden: boolean) {
    const id = String(inboxId ?? "").trim();
    if (!id || isInboxToggleLoading(id)) return;
    inboxToggleLoadingById.value = { ...inboxToggleLoadingById.value, [id]: true };
    try {
      await doSetContactInboxHidden({ inboxId: id, hidden });
    } catch (e: unknown) {
      console.error("[setInboxHidden] mutation failed:", e);
    } finally {
      inboxToggleLoadingById.value = { ...inboxToggleLoadingById.value, [id]: false };
    }
  }

  function threadInboxes(thread: { id: string }) {
    return contactInboxes.value
      .filter((inbox) => inbox.contactId === thread.id)
      .sort((a, b) => {
        const aTime = a.lastMessageAt || a.updatedAt;
        const bTime = b.lastMessageAt || b.updatedAt;
        return bTime.localeCompare(aTime);
      });
  }

  function formatInboxLabel(inbox: ContactInbox) {
    const title = String(inbox.title ?? "").trim();
    if (title) return `${inbox.channel} · ${title}`;
    const source = String(inbox.sourceExternalId ?? "").trim();
    if (!source) return inbox.channel;
    const tail = source.length > 18 ? source.slice(-18) : source;
    return `${inbox.channel} · ${tail}`;
  }

  return {
    contactInboxes,
    inboxToggleLoadingById,
    setInboxHidden,
    isInboxToggleLoading,
    threadInboxes,
    formatInboxLabel,
    refetchContactInboxes,
  };
}