import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'

import { pipelineApi } from './pipelineApi'

export function usePipelineBoard(reqId: string | null) {
  return useQuery({
    queryKey: ['recruitmatch', 'pipeline', reqId],
    queryFn: () => pipelineApi.board(reqId as string),
    enabled: !!reqId,
  })
}

export function useApplication(id: string | null) {
  return useQuery({
    queryKey: ['recruitmatch', 'application', id],
    queryFn: () => pipelineApi.get(id as string),
    enabled: !!id,
  })
}

// The reason vocabulary is served rather than hardcoded, so the form cannot offer a code the database
// would refuse. It never changes within a session, so it is cached indefinitely.
export function useDispositions() {
  return useQuery({
    queryKey: ['recruitmatch', 'dispositions'],
    queryFn: () => pipelineApi.dispositions(),
    staleTime: Infinity,
  })
}

// A stage move changes the board, the application, the job order's seat count and the dashboard, so all
// four are invalidated. Leaving any stale shows a seat as open seconds after it was filled.
function useInvalidate(reqId?: string) {
  const qc = useQueryClient()
  return (appId?: string) => {
    void qc.invalidateQueries({ queryKey: ['recruitmatch', 'pipeline', reqId] })
    void qc.invalidateQueries({ queryKey: ['recruitmatch', 'requisitions'] })
    void qc.invalidateQueries({ queryKey: ['recruitmatch', 'dashboard'] })
    if (appId) void qc.invalidateQueries({ queryKey: ['recruitmatch', 'application', appId] })
  }
}

export function useSubmitCandidate(reqId: string) {
  const inv = useInvalidate(reqId)
  return useMutation({
    mutationFn: (v: { candidate_id: string; stage?: string; source_touch?: string }) => pipelineApi.submit(reqId, v),
    onSuccess: () => inv(),
  })
}

export function useMoveStage(reqId?: string) {
  const inv = useInvalidate(reqId)
  return useMutation({
    mutationFn: (v: { id: string; expected_stage: string; to_stage: string; reason?: string; disposition_code?: string }) =>
      pipelineApi.move(v.id, {
        expected_stage: v.expected_stage,
        to_stage: v.to_stage,
        reason: v.reason,
        disposition_code: v.disposition_code,
      }),
    onSuccess: (_d, v) => inv(v.id),
  })
}