/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *--------------------------------------------------------------------------------------------*/

package com.github.copilot.sdk;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.junit.jupiter.api.Test;

import com.github.copilot.sdk.events.AssistantMessageEvent;
import com.github.copilot.sdk.events.SessionIdleEvent;
import com.github.copilot.sdk.json.MessageOptions;

/**
 * Verifies the documented contract that {@code timeoutMs <= 0} means "no
 * timeout" in {@link CopilotSession#sendAndWait(MessageOptions, long)}.
 */
public class ZeroTimeoutContractTest {

    @SuppressWarnings("unchecked")
    @Test
    void sendAndWaitWithZeroTimeoutShouldNotTimeOut() throws Exception {
        // Build a session via reflection (package-private constructor)
        var ctor = CopilotSession.class.getDeclaredConstructor(
                String.class, JsonRpcClient.class, String.class);
        ctor.setAccessible(true);

        var mockRpc = mock(JsonRpcClient.class);
        when(mockRpc.invoke(any(), any(), any()))
                .thenReturn(new CompletableFuture<>());

        var session = ctor.newInstance("zero-timeout-test", mockRpc, null);

        // Per the Javadoc: timeoutMs of 0 means "no timeout".
        // The future should NOT complete with TimeoutException.
        CompletableFuture<AssistantMessageEvent> result =
                session.sendAndWait(new MessageOptions().setPrompt("test"), 0);

        // Give the scheduler a chance to fire if it was (incorrectly) scheduled
        Thread.sleep(200);

        // The future should still be pending — not timed out
        assertFalse(result.isDone(),
                "Future should not be done; timeoutMs=0 means no timeout per Javadoc");
    }
}