import { useCallback, useRef, useState } from "preact/hooks";
import type { AgentState } from "../types";

export interface PushToTalkState {
  pttPressed: boolean;
  micStream: MediaStream | null;
  beginPTT(): void;
  endPTT(): void;
}

interface UsePushToTalkOptions {
  connected: boolean;
  agentState: AgentState;
  onPttChange(pressed: boolean): void;
  onSetAgentState(state: AgentState): void;
  onShowStatus(text: string, persistMs?: number): void;
}

export function usePushToTalk({
  connected,
  onPttChange,
  onSetAgentState,
  onShowStatus,
}: UsePushToTalkOptions): PushToTalkState {
  const [pttPressed, setPttPressed] = useState(false);
  const micStreamRef = useRef<MediaStream | null>(null);

  // Attach mic stream from RTCPeerConnection tracks — caller passes it via micStream prop
  // Here we track from the parent. Mic enable/disable is done by the parent hook.

  const beginPTT = useCallback(() => {
    if (!connected) return;
    if (pttPressed) return;
    setPttPressed(true);
    onPttChange(true);
    onSetAgentState("listening");
    onShowStatus("Listening...");
  }, [connected, pttPressed, onPttChange, onSetAgentState, onShowStatus]);

  const endPTT = useCallback(() => {
    if (!pttPressed) return;
    setPttPressed(false);
    onPttChange(false);
    onSetAgentState("idle");
    if (connected) onShowStatus("Hold anywhere to talk", 1800);
  }, [pttPressed, onPttChange, onSetAgentState, onShowStatus, connected]);

  return {
    pttPressed,
    micStream: micStreamRef.current,
    beginPTT,
    endPTT,
  };
}