import { useInfiniteQuery, useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { api } from "./client.ts";
import type { BoardSnapshot, HubSettings, IssueDetail, IssueRow, Note, NoteFields } from "./types.ts";

export const ISSUE_FILTER_NAMES = ["sprint", "assignee", "work_kind", "fact_status", "status", "label", "epic", "neighbor", "q"] as const;
export type IssueFilters = Partial<Record<(typeof ISSUE_FILTER_NAMES)[number], string>>;
export const ISSUE_PAGE = 50;

export const qk = {
  settings: ["settings"] as const,
  board: ["board"] as const,
  issues: (f: IssueFilters) => ["issues", f] as const,
  issue: (key: string) => ["issue", key] as const,
};

export const useSettings = () =>
  useQuery({ queryKey: qk.settings, queryFn: () => api.get<HubSettings>("/settings"), staleTime: Infinity });

export const useBoard = () => useQuery({ queryKey: qk.board, queryFn: () => api.get<BoardSnapshot>("/board") });

export const useIssue = (key: string) =>
  useQuery({ queryKey: qk.issue(key), queryFn: () => api.get<IssueDetail>(`/issues/${encodeURIComponent(key)}`) });

// список порциями по ISSUE_PAGE: следующая порция есть, пока последняя полная
export const useIssues = (filters: IssueFilters) =>
  useInfiniteQuery({
    queryKey: qk.issues(filters),
    initialPageParam: 0,
    queryFn: ({ pageParam }) =>
      api.get<{ issues: IssueRow[] }>("/issues", { ...filters, limit: ISSUE_PAGE, offset: pageParam }).then((r) => r.issues),
    getNextPageParam: (last, all) => (last.length < ISSUE_PAGE ? undefined : all.length * ISSUE_PAGE),
  });

// сохранение заметки: key фиксируется при создании мутации — ответ пишется в карточку той задачи, для которой отправлен
export function useSaveNote(key: string) {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (fields: NoteFields) =>
      api.put<Note>(`/issues/${encodeURIComponent(key)}/note`, { ...fields, updated_by: "web" }),
    onSuccess: (note) => {
      qc.setQueryData<IssueDetail>(qk.issue(key), (d) => (d ? { ...d, note } : d));
      void qc.invalidateQueries({ queryKey: ["issues"] });
      void qc.invalidateQueries({ queryKey: qk.board });
    },
  });
}