import { ref, computed, watch, type ComputedRef, type Ref } from "vue";
import { useQuery, useMutation } from "@vue/apollo-composable";
import { PinsQueryDocument, ToggleContactPinMutationDocument } from "~~/graphql/generated";

import type { CommItem } from "~/composables/useContacts";
import type { CalendarEvent, EventLifecyclePhase } from "~/composables/useCalendar";
import { formatDay, isEventFinalStatus } from "~/composables/useCalendar";

export type CommPin = {
  id: string;
  contact: string;
  text: string;
};

export function usePins(opts: {
  apolloAuthReady: ComputedRef<boolean>;
  selectedCommThread: ComputedRef<{ id: string; contact: string; items: CommItem[] } | undefined>;
  selectedCommLifecycleEvents: ComputedRef<Array<{ event: CalendarEvent; phase: EventLifecyclePhase; timelineAt: string }>>;
  visibleThreadItems: ComputedRef<CommItem[]>;
}) {
  const { result: pinsResult, refetch: refetchPins } = useQuery(
    PinsQueryDocument,
    null,
    { enabled: opts.apolloAuthReady },
  );

  const { mutate: doToggleContactPin } = useMutation(ToggleContactPinMutationDocument, {
    refetchQueries: [{ query: PinsQueryDocument }],
  });

  const commPins = ref<CommPin[]>([]);
  const commPinToggling = ref(false);
  const commPinContextMenu = ref<{
    open: boolean;
    x: number;
    y: number;
    entry: any | null;
  }>({
    open: false,
    x: 0,
    y: 0,
    entry: null,
  });

  watch(() => pinsResult.value?.pins, (v) => {
    if (v) commPins.value = v as CommPin[];
  }, { immediate: true });

  const selectedCommPins = computed(() => {
    if (!opts.selectedCommThread.value) return [];
    return commPins.value.filter((item) => item.contact === opts.selectedCommThread.value?.contact);
  });

  function normalizePinText(value: string) {
    return String(value ?? "").replace(/\s+/g, " ").trim();
  }

  function stripPinnedPrefix(value: string) {
    return String(value ?? "").replace(/^\s*(закреплено|pinned)\s*:\s*/i, "").trim();
  }

  function isPinnedText(contact: string, value: string) {
    const contactName = String(contact ?? "").trim();
    const text = normalizePinText(value);
    if (!contactName || !text) return false;
    return commPins.value.some((pin) => pin.contact === contactName && normalizePinText(pin.text) === text);
  }

  function entryPinText(entry: any): string {
    if (!entry) return "";
    if (entry.kind === "pin") return normalizePinText(stripPinnedPrefix(entry.text ?? ""));
    if (entry.kind === "recommendation") return normalizePinText(entry.card?.text ?? "");
    if (entry.kind === "eventLifecycle") {
      return normalizePinText(entry.event?.note || entry.event?.title || "");
    }
    if (entry.kind === "call") return normalizePinText(entry.item?.text || "");
    return normalizePinText(entry.item?.text || "");
  }

  async function togglePinnedText(contact: string, value: string) {
    if (commPinToggling.value) return;
    const contactName = String(contact ?? "").trim();
    const text = normalizePinText(value);
    if (!contactName || !text) return;
    commPinToggling.value = true;
    try {
      await doToggleContactPin({ contact: contactName, text });
    } finally {
      commPinToggling.value = false;
    }
  }

  async function togglePinForEntry(entry: any) {
    const contact = opts.selectedCommThread.value?.contact ?? "";
    const text = entryPinText(entry);
    await togglePinnedText(contact, text);
  }

  function isPinnedEntry(entry: any) {
    const contact = opts.selectedCommThread.value?.contact ?? "";
    const text = entryPinText(entry);
    return isPinnedText(contact, text);
  }

  function closeCommPinContextMenu() {
    commPinContextMenu.value = {
      open: false,
      x: 0,
      y: 0,
      entry: null,
    };
  }

  function openCommPinContextMenu(event: MouseEvent, entry: any) {
    const text = entryPinText(entry);
    if (!text) return;
    const menuWidth = 136;
    const menuHeight = 46;
    const padding = 8;
    const maxX = Math.max(padding, window.innerWidth - menuWidth - padding);
    const maxY = Math.max(padding, window.innerHeight - menuHeight - padding);
    const x = Math.min(maxX, Math.max(padding, event.clientX));
    const y = Math.min(maxY, Math.max(padding, event.clientY));
    commPinContextMenu.value = {
      open: true,
      x,
      y,
      entry,
    };
  }

  const commPinContextActionLabel = computed(() => {
    const entry = commPinContextMenu.value.entry;
    if (!entry) return "Pin";
    return isPinnedEntry(entry) ? "Unpin" : "Pin";
  });

  async function applyCommPinContextAction() {
    const entry = commPinContextMenu.value.entry;
    if (!entry) return;
    closeCommPinContextMenu();
    await togglePinForEntry(entry);
  }

  function onWindowPointerDownForCommPinMenu(event: PointerEvent) {
    if (!commPinContextMenu.value.open) return;
    const target = event.target as HTMLElement | null;
    if (target?.closest(".comm-pin-context-menu")) return;
    closeCommPinContextMenu();
  }

  function onWindowKeyDownForCommPinMenu(event: KeyboardEvent) {
    if (!commPinContextMenu.value.open) return;
    if (event.key === "Escape") {
      closeCommPinContextMenu();
    }
  }

  const selectedCommPinnedStream = computed(() => {
    const pins = selectedCommPins.value.map((pin) => {
      const normalizedText = normalizePinText(stripPinnedPrefix(pin.text));
      const sourceItem =
        [...opts.visibleThreadItems.value]
          .filter((item) => normalizePinText(item.text) === normalizedText)
          .sort((a, b) => b.at.localeCompare(a.at))[0] ?? null;
      return {
        id: `pin-${pin.id}`,
        kind: "pin" as const,
        text: pin.text,
        sourceItem,
      };
    });

    const rank = (phase: EventLifecyclePhase) => {
      if (phase === "awaiting_outcome") return 0;
      if (phase === "due_soon") return 1;
      if (phase === "scheduled") return 2;
      return 3;
    };

    const events = opts.selectedCommLifecycleEvents.value
      .filter((item) => !isEventFinalStatus(item.event.isArchived))
      .sort((a, b) => rank(a.phase) - rank(b.phase) || a.event.start.localeCompare(b.event.start))
      .map((item) => ({
        id: `event-${item.event.id}`,
        kind: "eventLifecycle" as const,
        event: item.event,
        phase: item.phase,
      }));

    return [...pins, ...events];
  });

  const latestPinnedItem = computed(() => selectedCommPinnedStream.value[0] ?? null);

  const latestPinnedLabel = computed(() => {
    if (!latestPinnedItem.value) return "No pinned items yet";
    if (latestPinnedItem.value.kind === "pin") return stripPinnedPrefix(latestPinnedItem.value.text);
    return `${latestPinnedItem.value.event.title} · ${formatDay(latestPinnedItem.value.event.start)}`;
  });

  return {
    commPins,
    commPinToggling,
    commPinContextMenu,
    selectedCommPins,
    selectedCommPinnedStream,
    togglePinnedText,
    togglePinForEntry,
    isPinnedText,
    isPinnedEntry,
    entryPinText,
    normalizePinText,
    stripPinnedPrefix,
    latestPinnedItem,
    latestPinnedLabel,
    closeCommPinContextMenu,
    openCommPinContextMenu,
    commPinContextActionLabel,
    applyCommPinContextAction,
    onWindowPointerDownForCommPinMenu,
    onWindowKeyDownForCommPinMenu,
    refetchPins,
  };
}