import { useCallback, useEffect, useRef, useState } from 'react';
import {
  isGoalRunApiAvailableError,
  listAwaitingGoalRuns,
  listGoalRuns,
  type GoalRunAwaitingItem,
} from '../api/goalRun';
import type { ChatState } from '../types';

export function useGoalRunAwaiting({
  userId,
  sessionId,
  chatState,
  featureEnabled,
}: {
  userId?: string | null;
  sessionId?: string | null;
  chatState: ChatState;
  featureEnabled?: boolean;
}) {
  const [enabled, setEnabled] = useState(false);
  const [items, setItems] = useState<GoalRunAwaitingItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const unavailableRef = useRef(featureEnabled === false);

  const refresh = useCallback(async () => {
    if (!userId || unavailableRef.current) return;
    if (featureEnabled === false) {
      unavailableRef.current = true;
      setEnabled(false);
      setItems([]);
      return;
    }
    setLoading(true);
    setError(null);
    try {
      const goals = await listGoalRuns({
        statuses: ['awaiting_user'],
        limit: 20,
      });
      setEnabled(true);
      const awaiting = listAwaitingGoalRuns(goals);
      if (sessionId) {
        awaiting.sort((left, right) => {
          const leftMatch = left.goal.sourceSessionId === sessionId ? 1 : 0;
          const rightMatch = right.goal.sourceSessionId === sessionId ? 1 : 0;
          return rightMatch - leftMatch;
        });
      }
      setItems(awaiting);
    } catch (err) {
      if (isGoalRunApiAvailableError(err)) {
        unavailableRef.current = true;
        setEnabled(false);
        setItems([]);
        return;
      }
      setError(err instanceof Error ? err.message : String(err));
    } finally {
      setLoading(false);
    }
  }, [featureEnabled, sessionId, userId]);

  useEffect(() => {
    unavailableRef.current = featureEnabled === false;
    if (!userId || featureEnabled === false) {
      setEnabled(false);
      setItems([]);
      return;
    }
    void refresh();
  }, [featureEnabled, refresh, userId]);

  useEffect(() => {
    if (!userId || unavailableRef.current) return;
    if (chatState === 'idle' || chatState === 'error') {
      void refresh();
    }
  }, [chatState, refresh, userId]);

  const dismissItem = useCallback((goalRunId: string) => {
    setItems((prev) => prev.filter((item) => item.goal.id !== goalRunId));
  }, []);

  return {
    enabled,
    items,
    loading,
    error,
    refresh,
    dismissItem,
  };
}