import { useQuery } from '@tanstack/react-query';
import { useAccessibilityPermission } from '@/components/AccessibilityGate/AccessibilityGate';
import { useInputMonitoringPermission } from '@/components/InputMonitoringGate/InputMonitoringGate';
import { apiClient } from '@/lib/api/client';
import type { ModelReadiness } from '@/lib/api/types';
import { useCaptureSettings } from '@/lib/hooks/useSettings';
import { usePlatform } from '@/platform/PlatformContext';

const READINESS_POLL_INTERVAL_MS = 5_000;

export type ReadinessGate = 'stt' | 'llm' | 'input_monitoring' | 'accessibility';

export interface DictationReadiness {
  isLoading: boolean;
  canRecord: boolean;
  allReady: boolean;
  /** Subset of gates that are NOT yet satisfied — what the checklist renders. */
  missing: ReadinessGate[];
  stt: ModelReadiness | undefined;
  llm: ModelReadiness | undefined;
  /** Whether the user has auto-refine (LLM polish) enabled. */
  autoRefine: boolean;
  inputMonitoring: boolean;
  accessibility: boolean;
  refetch: () => void;
  openInputMonitoringSettings: () => Promise<void>;
  openAccessibilitySettings: () => Promise<void>;
  recheckInputMonitoring: () => Promise<boolean>;
  recheckAccessibility: () => Promise<boolean>;
}

/**
 * Single source of truth for dictation readiness.
 *
 * ``canRecord`` covers the gates that must be green before the chord can
 * start recording. ``allReady`` also includes Accessibility, which only gates
 * synthetic paste — dictation still records and lands in Captures without it.
 *
 * Gates:
 *  - stt / llm: backend ``/capture/readiness`` (polled, since downloads
 *    finish out-of-band — e.g. user kicks off a download in another tab and
 *    expects the toggle to auto-unlock when it lands)
 *  - input_monitoring / accessibility: macOS TCC checks via Tauri commands
 *    (rechecked on window focus by the underlying hooks)
 *
 * Hotkey-enabled is the user's intent toggle and is intentionally *not*
 * a gate here — that's `useChordSync`'s concern.
 */
export function useDictationReadiness(): DictationReadiness {
  const platform = usePlatform();
  const isTauri = platform.metadata.isTauri;
  const { settings } = useCaptureSettings();
  const autoRefine = settings?.auto_refine ?? true;

  const {
    needsPermission: inputMonNeeds,
    recheck: recheckInputMon,
    openSettings: openInputMon,
  } = useInputMonitoringPermission();
  const {
    needsPermission: a11yNeeds,
    recheck: recheckA11y,
    openSettings: openA11y,
  } = useAccessibilityPermission();

  const { data, isLoading, refetch } = useQuery({
    queryKey: ['capture-readiness'],
    queryFn: () => apiClient.getCaptureReadiness(),
    // Poll only while a required model is still missing/downloading. Once
    // all required models are green the endpoint's answer can't change
    // until the user swaps models in settings, and that path invalidates
    // the query explicitly from useSettings. refetchOnWindowFocus stays
    // gated to the same condition.
    refetchInterval: (query) => {
      const d = query.state.data;
      const allGreen = d && d.stt.ready && (!autoRefine || d.llm.ready);
      return allGreen ? false : READINESS_POLL_INTERVAL_MS;
    },
    refetchOnWindowFocus: (query) => {
      const d = query.state.data;
      return !(d && d.stt.ready && (!autoRefine || d.llm.ready));
    },
  });

  // On the web build there's no TCC layer — treat both as granted so the
  // checklist doesn't block users who can't even open System Settings.
  const inputMonitoring = isTauri ? !inputMonNeeds : true;
  const accessibility = isTauri ? !a11yNeeds : true;
  const sttReady = data?.stt.ready ?? false;
  const llmReady = data?.llm.ready ?? false;

  const missing: ReadinessGate[] = [];
  if (!sttReady) missing.push('stt');
  if (autoRefine && !llmReady) missing.push('llm');
  if (!inputMonitoring) missing.push('input_monitoring');
  if (!accessibility) missing.push('accessibility');
  const canRecord = sttReady && (!autoRefine || llmReady) && inputMonitoring;

  return {
    isLoading,
    canRecord,
    allReady: missing.length === 0,
    missing,
    stt: data?.stt,
    llm: data?.llm,
    autoRefine,
    inputMonitoring,
    accessibility,
    refetch: () => {
      refetch();
    },
    openInputMonitoringSettings: openInputMon,
    openAccessibilitySettings: openA11y,
    recheckInputMonitoring: recheckInputMon,
    recheckAccessibility: recheckA11y,
  };
}