/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { vi, describe, it, expect, beforeEach, afterEach } from 'vitest';
import { ContextState, SubAgentScope, SubagentTerminateMode, } from './subagent.js';
import { Config } from '../config/config.js';
import { GeminiChat, StreamEventType } from './geminiChat.js';
import { createContentGenerator } from './contentGenerator.js';
import { getEnvironmentContext } from '../utils/environmentContext.js';
import { executeToolCall } from './nonInteractiveToolExecutor.js';
import { DEFAULT_GEMINI_MODEL } from '../config/models.js';
import { Type } from '@google/genai';
import { ToolErrorType } from '../tools/tool-error.js';
vi.mock('./geminiChat.js');
vi.mock('./contentGenerator.js');
vi.mock('../utils/environmentContext.js');
vi.mock('./nonInteractiveToolExecutor.js');
vi.mock('../ide/ide-client.js');
async function createMockConfig(toolRegistryMocks = {}, configParameters = {}) {
    const configParams = {
        sessionId: 'test-session',
        model: DEFAULT_GEMINI_MODEL,
        targetDir: '.',
        debugMode: false,
        cwd: process.cwd(),
        ...configParameters,
    };
    const config = new Config(configParams);
    await config.initialize();
    // Mock ToolRegistry
    const mockToolRegistry = {
        getTool: vi.fn(),
        getFunctionDeclarationsFiltered: vi.fn().mockReturnValue([]),
        ...toolRegistryMocks,
    };
    vi.spyOn(config, 'getToolRegistry').mockReturnValue(mockToolRegistry);
    return { config, toolRegistry: mockToolRegistry };
}
// Helper to simulate LLM responses (sequence of tool calls over multiple turns)
const createMockStream = (functionCallsList) => {
    let index = 0;
    // This mock now returns a Promise that resolves to the async generator,
    // matching the new signature for sendMessageStream.
    return vi.fn().mockImplementation(async () => {
        const response = functionCallsList[index] || 'stop';
        index++;
        return (async function* () {
            let mockResponseValue;
            if (response === 'stop' || response.length === 0) {
                // Simulate a text response for stop/empty conditions.
                mockResponseValue = {
                    candidates: [{ content: { parts: [{ text: 'Done.' }] } }],
                };
            }
            else {
                // Simulate a tool call response.
                mockResponseValue = {
                    candidates: [], // Good practice to include for safety.
                    functionCalls: response,
                };
            }
            // The stream must now yield a StreamEvent object of type CHUNK.
            yield {
                type: StreamEventType.CHUNK,
                value: mockResponseValue,
            };
        })();
    });
};
describe('subagent.ts', () => {
    describe('ContextState', () => {
        it('should set and get values correctly', () => {
            const context = new ContextState();
            context.set('key1', 'value1');
            context.set('key2', 123);
            expect(context.get('key1')).toBe('value1');
            expect(context.get('key2')).toBe(123);
            expect(context.get_keys()).toEqual(['key1', 'key2']);
        });
        it('should return undefined for missing keys', () => {
            const context = new ContextState();
            expect(context.get('missing')).toBeUndefined();
        });
    });
    describe('SubAgentScope', () => {
        let mockSendMessageStream;
        const defaultModelConfig = {
            model: 'gemini-1.5-flash-latest',
            temp: 0.5, // Specific temp to test override
            top_p: 1,
        };
        const defaultRunConfig = {
            max_time_minutes: 5,
            max_turns: 10,
        };
        beforeEach(async () => {
            vi.clearAllMocks();
            vi.mocked(getEnvironmentContext).mockResolvedValue([
                { text: 'Env Context' },
            ]);
            vi.mocked(createContentGenerator).mockResolvedValue({
                getGenerativeModel: vi.fn(),
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
            });
            mockSendMessageStream = vi.fn();
            // We mock the implementation of the constructor.
            vi.mocked(GeminiChat).mockImplementation(() => ({
                sendMessageStream: mockSendMessageStream,
            }));
        });
        afterEach(() => {
            vi.restoreAllMocks();
        });
        // Helper to safely access generationConfig from mock calls
        const getGenerationConfigFromMock = (callIndex = 0) => {
            const callArgs = vi.mocked(GeminiChat).mock.calls[callIndex];
            const generationConfig = callArgs?.[1];
            // Ensure it's defined before proceeding
            expect(generationConfig).toBeDefined();
            if (!generationConfig)
                throw new Error('generationConfig is undefined');
            return generationConfig;
        };
        describe('create (Tool Validation)', () => {
            const promptConfig = { systemPrompt: 'Test prompt' };
            it('should create a SubAgentScope successfully with minimal config', async () => {
                const { config } = await createMockConfig();
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                expect(scope).toBeInstanceOf(SubAgentScope);
            });
            it('should throw an error if a tool requires confirmation', async () => {
                const mockTool = {
                    name: 'risky_tool',
                    schema: { parametersJsonSchema: { type: 'object', properties: {} } },
                    build: vi.fn().mockReturnValue({
                        shouldConfirmExecute: vi.fn().mockResolvedValue({
                            type: 'exec',
                            title: 'Confirm',
                            command: 'rm -rf /',
                        }),
                    }),
                };
                const { config } = await createMockConfig({
                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
                    getTool: vi.fn().mockReturnValue(mockTool),
                });
                const toolConfig = { tools: ['risky_tool'] };
                const options = { toolConfig };
                await expect(SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, options)).rejects.toThrow('Tool "risky_tool" requires user confirmation and cannot be used in a non-interactive subagent.');
            });
            it('should succeed if tools do not require confirmation', async () => {
                const mockTool = {
                    name: 'safe_tool',
                    schema: { parametersJsonSchema: { type: 'object', properties: {} } },
                    build: vi.fn().mockReturnValue({
                        shouldConfirmExecute: vi.fn().mockResolvedValue(null),
                    }),
                };
                const { config } = await createMockConfig({
                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
                    getTool: vi.fn().mockReturnValue(mockTool),
                });
                const toolConfig = { tools: ['safe_tool'] };
                const options = { toolConfig };
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, options);
                expect(scope).toBeInstanceOf(SubAgentScope);
            });
            it('should skip interactivity check and warn for tools with required parameters', async () => {
                const consoleWarnSpy = vi
                    .spyOn(console, 'warn')
                    .mockImplementation(() => { });
                const mockToolWithParams = {
                    name: 'tool_with_params',
                    schema: {
                        parametersJsonSchema: {
                            type: 'object',
                            properties: {
                                path: { type: 'string' },
                            },
                            required: ['path'],
                        },
                    },
                    // build should not be called, but we mock it to be safe
                    build: vi.fn(),
                };
                const { config } = await createMockConfig({
                    getTool: vi.fn().mockReturnValue(mockToolWithParams),
                    getAllTools: vi.fn().mockReturnValue([mockToolWithParams]),
                });
                const toolConfig = { tools: ['tool_with_params'] };
                const options = { toolConfig };
                // The creation should succeed without throwing
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, options);
                expect(scope).toBeInstanceOf(SubAgentScope);
                // Check that the warning was logged
                expect(consoleWarnSpy).toHaveBeenCalledWith('Cannot check tool "tool_with_params" for interactivity because it requires parameters. Assuming it is safe for non-interactive use.');
                // Ensure build was never called
                expect(mockToolWithParams.build).not.toHaveBeenCalled();
                consoleWarnSpy.mockRestore();
            });
        });
        describe('runNonInteractive - Initialization and Prompting', () => {
            it('should correctly template the system prompt and initialize GeminiChat', async () => {
                const { config } = await createMockConfig();
                vi.mocked(GeminiChat).mockClear();
                const promptConfig = {
                    systemPrompt: 'Hello ${name}, your task is ${task}.',
                };
                const context = new ContextState();
                context.set('name', 'Agent');
                context.set('task', 'Testing');
                // Model stops immediately
                mockSendMessageStream.mockImplementation(createMockStream(['stop']));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                await scope.runNonInteractive(context);
                // Check if GeminiChat was initialized correctly by the subagent
                expect(GeminiChat).toHaveBeenCalledTimes(1);
                const callArgs = vi.mocked(GeminiChat).mock.calls[0];
                // Check Generation Config
                const generationConfig = getGenerationConfigFromMock();
                // Check temperature override
                expect(generationConfig.temperature).toBe(defaultModelConfig.temp);
                expect(generationConfig.systemInstruction).toContain('Hello Agent, your task is Testing.');
                expect(generationConfig.systemInstruction).toContain('Important Rules:');
                // Check History (should include environment context)
                const history = callArgs[2];
                expect(history).toEqual([
                    { role: 'user', parts: [{ text: 'Env Context' }] },
                    {
                        role: 'model',
                        parts: [{ text: 'Got it. Thanks for the context!' }],
                    },
                ]);
            });
            it('should include output instructions in the system prompt when outputs are defined', async () => {
                const { config } = await createMockConfig();
                vi.mocked(GeminiChat).mockClear();
                const promptConfig = { systemPrompt: 'Do the task.' };
                const outputConfig = {
                    outputs: {
                        result1: 'The first result',
                    },
                };
                const context = new ContextState();
                // Model stops immediately
                mockSendMessageStream.mockImplementation(createMockStream(['stop']));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, { outputConfig });
                await scope.runNonInteractive(context);
                const generationConfig = getGenerationConfigFromMock();
                const systemInstruction = generationConfig.systemInstruction;
                expect(systemInstruction).toContain('Do the task.');
                expect(systemInstruction).toContain('you MUST emit the required output variables');
                expect(systemInstruction).toContain("Use 'self.emitvalue' to emit the 'result1' key");
            });
            it('should use initialMessages instead of systemPrompt if provided', async () => {
                const { config } = await createMockConfig();
                vi.mocked(GeminiChat).mockClear();
                const initialMessages = [
                    { role: 'user', parts: [{ text: 'Hi' }] },
                ];
                const promptConfig = { initialMessages };
                const context = new ContextState();
                // Model stops immediately
                mockSendMessageStream.mockImplementation(createMockStream(['stop']));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                await scope.runNonInteractive(context);
                const callArgs = vi.mocked(GeminiChat).mock.calls[0];
                const generationConfig = getGenerationConfigFromMock();
                const history = callArgs[2];
                expect(generationConfig.systemInstruction).toBeUndefined();
                expect(history).toEqual([
                    { role: 'user', parts: [{ text: 'Env Context' }] },
                    {
                        role: 'model',
                        parts: [{ text: 'Got it. Thanks for the context!' }],
                    },
                    ...initialMessages,
                ]);
            });
            it('should throw an error if template variables are missing', async () => {
                const { config } = await createMockConfig();
                const promptConfig = {
                    systemPrompt: 'Hello ${name}, you are missing ${missing}.',
                };
                const context = new ContextState();
                context.set('name', 'Agent');
                // 'missing' is not set
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                // The error from templating causes the runNonInteractive to reject and the terminate_reason to be ERROR.
                await expect(scope.runNonInteractive(context)).rejects.toThrow('Missing context values for the following keys: missing');
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.ERROR);
            });
            it('should validate that systemPrompt and initialMessages are mutually exclusive', async () => {
                const { config } = await createMockConfig();
                const promptConfig = {
                    systemPrompt: 'System',
                    initialMessages: [{ role: 'user', parts: [{ text: 'Hi' }] }],
                };
                const context = new ContextState();
                const agent = await SubAgentScope.create('TestAgent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                await expect(agent.runNonInteractive(context)).rejects.toThrow('PromptConfig cannot have both `systemPrompt` and `initialMessages` defined.');
                expect(agent.output.terminate_reason).toBe(SubagentTerminateMode.ERROR);
            });
        });
        describe('runNonInteractive - Execution and Tool Use', () => {
            const promptConfig = { systemPrompt: 'Execute task.' };
            it('should terminate with GOAL if no outputs are expected and model stops', async () => {
                const { config } = await createMockConfig();
                // Model stops immediately
                mockSendMessageStream.mockImplementation(createMockStream(['stop']));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                await scope.runNonInteractive(new ContextState());
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.GOAL);
                expect(scope.output.emitted_vars).toEqual({});
                expect(mockSendMessageStream).toHaveBeenCalledTimes(1);
                // Check the initial message
                expect(mockSendMessageStream.mock.calls[0][1].message).toEqual([
                    { text: 'Get Started!' },
                ]);
            });
            it('should handle self.emitvalue and terminate with GOAL when outputs are met', async () => {
                const { config } = await createMockConfig();
                const outputConfig = {
                    outputs: { result: 'The final result' },
                };
                // Turn 1: Model responds with emitvalue call
                // Turn 2: Model stops after receiving the tool response
                mockSendMessageStream.mockImplementation(createMockStream([
                    [
                        {
                            name: 'self.emitvalue',
                            args: {
                                emit_variable_name: 'result',
                                emit_variable_value: 'Success!',
                            },
                        },
                    ],
                    'stop',
                ]));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, { outputConfig });
                await scope.runNonInteractive(new ContextState());
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.GOAL);
                expect(scope.output.emitted_vars).toEqual({ result: 'Success!' });
                expect(mockSendMessageStream).toHaveBeenCalledTimes(1);
                // Check the tool response sent back in the second call
                const secondCallArgs = mockSendMessageStream.mock.calls[0][1];
                expect(secondCallArgs.message).toEqual([{ text: 'Get Started!' }]);
            });
            it('should execute external tools and provide the response to the model', async () => {
                const listFilesToolDef = {
                    name: 'list_files',
                    description: 'Lists files',
                    parameters: { type: Type.OBJECT, properties: {} },
                };
                const { config } = await createMockConfig({
                    getFunctionDeclarationsFiltered: vi
                        .fn()
                        .mockReturnValue([listFilesToolDef]),
                    getTool: vi.fn().mockReturnValue(undefined),
                });
                const toolConfig = { tools: ['list_files'] };
                // Turn 1: Model calls the external tool
                // Turn 2: Model stops
                mockSendMessageStream.mockImplementation(createMockStream([
                    [
                        {
                            id: 'call_1',
                            name: 'list_files',
                            args: { path: '.' },
                        },
                    ],
                    'stop',
                ]));
                // Mock the tool execution result
                vi.mocked(executeToolCall).mockResolvedValue({
                    callId: 'call_1',
                    responseParts: [{ text: 'file1.txt\nfile2.ts' }],
                    resultDisplay: 'Listed 2 files',
                    error: undefined,
                    errorType: undefined, // Or ToolErrorType.NONE if available and appropriate
                });
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, { toolConfig });
                await scope.runNonInteractive(new ContextState());
                // Check tool execution
                expect(executeToolCall).toHaveBeenCalledWith(config, expect.objectContaining({ name: 'list_files', args: { path: '.' } }), expect.any(AbortSignal));
                // Check the response sent back to the model
                const secondCallArgs = mockSendMessageStream.mock.calls[1][1];
                expect(secondCallArgs.message).toEqual([
                    { text: 'file1.txt\nfile2.ts' },
                ]);
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.GOAL);
            });
            it('should provide specific tool error responses to the model', async () => {
                const { config } = await createMockConfig();
                const toolConfig = { tools: ['failing_tool'] };
                // Turn 1: Model calls the failing tool
                // Turn 2: Model stops after receiving the error response
                mockSendMessageStream.mockImplementation(createMockStream([
                    [
                        {
                            id: 'call_fail',
                            name: 'failing_tool',
                            args: {},
                        },
                    ],
                    'stop',
                ]));
                // Mock the tool execution failure.
                vi.mocked(executeToolCall).mockResolvedValue({
                    callId: 'call_fail',
                    responseParts: [{ text: 'ERROR: Tool failed catastrophically' }], // This should be sent to the model
                    resultDisplay: 'Tool failed catastrophically',
                    error: new Error('Failure'),
                    errorType: ToolErrorType.INVALID_TOOL_PARAMS,
                });
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, { toolConfig });
                await scope.runNonInteractive(new ContextState());
                // The agent should send the specific error message from responseParts.
                const secondCallArgs = mockSendMessageStream.mock.calls[1][1];
                expect(secondCallArgs.message).toEqual([
                    {
                        text: 'ERROR: Tool failed catastrophically',
                    },
                ]);
            });
            it('should nudge the model if it stops before emitting all required variables', async () => {
                const { config } = await createMockConfig();
                const outputConfig = {
                    outputs: { required_var: 'Must be present' },
                };
                // Turn 1: Model stops prematurely
                // Turn 2: Model responds to the nudge and emits the variable
                // Turn 3: Model stops
                mockSendMessageStream.mockImplementation(createMockStream([
                    'stop',
                    [
                        {
                            name: 'self.emitvalue',
                            args: {
                                emit_variable_name: 'required_var',
                                emit_variable_value: 'Here it is',
                            },
                        },
                    ],
                    'stop',
                ]));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig, { outputConfig });
                await scope.runNonInteractive(new ContextState());
                // Check the nudge message sent in Turn 2
                const secondCallArgs = mockSendMessageStream.mock.calls[1][1];
                // We check that the message contains the required variable name and the nudge phrasing.
                expect(secondCallArgs.message[0].text).toContain('required_var');
                expect(secondCallArgs.message[0].text).toContain('You have stopped calling tools');
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.GOAL);
                expect(scope.output.emitted_vars).toEqual({
                    required_var: 'Here it is',
                });
                expect(mockSendMessageStream).toHaveBeenCalledTimes(2);
            });
        });
        describe('runNonInteractive - Termination and Recovery', () => {
            const promptConfig = { systemPrompt: 'Execute task.' };
            it('should terminate with MAX_TURNS if the limit is reached', async () => {
                const { config } = await createMockConfig();
                const runConfig = { ...defaultRunConfig, max_turns: 2 };
                // Model keeps looping by calling emitvalue repeatedly
                mockSendMessageStream.mockImplementation(createMockStream([
                    [
                        {
                            name: 'self.emitvalue',
                            args: { emit_variable_name: 'loop', emit_variable_value: 'v1' },
                        },
                    ],
                    [
                        {
                            name: 'self.emitvalue',
                            args: { emit_variable_name: 'loop', emit_variable_value: 'v2' },
                        },
                    ],
                    // This turn should not happen
                    [
                        {
                            name: 'self.emitvalue',
                            args: { emit_variable_name: 'loop', emit_variable_value: 'v3' },
                        },
                    ],
                ]));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, runConfig);
                await scope.runNonInteractive(new ContextState());
                expect(mockSendMessageStream).toHaveBeenCalledTimes(2);
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.MAX_TURNS);
            });
            it('should terminate with TIMEOUT if the time limit is reached during an LLM call', async () => {
                // Use fake timers to reliably test timeouts
                vi.useFakeTimers();
                const { config } = await createMockConfig({}, { useRipgrep: false });
                const runConfig = { max_time_minutes: 5, max_turns: 100 };
                // We need to control the resolution of the sendMessageStream promise to advance the timer during execution.
                let resolveStream;
                const streamPromise = new Promise((resolve) => {
                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
                    resolveStream = resolve;
                });
                // The LLM call will hang until we resolve the promise.
                mockSendMessageStream.mockReturnValue(streamPromise);
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, runConfig);
                const runPromise = scope.runNonInteractive(new ContextState());
                // Advance time beyond the limit (6 minutes) while the agent is awaiting the LLM response.
                await vi.advanceTimersByTimeAsync(6 * 60 * 1000);
                // Now resolve the stream. The model returns 'stop'.
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                resolveStream(createMockStream(['stop'])());
                await runPromise;
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.TIMEOUT);
                expect(mockSendMessageStream).toHaveBeenCalledTimes(1);
                vi.useRealTimers();
            });
            it('should terminate with ERROR if the model call throws', async () => {
                const { config } = await createMockConfig({}, { useRipgrep: false });
                mockSendMessageStream.mockRejectedValue(new Error('API Failure'));
                const scope = await SubAgentScope.create('test-agent', config, promptConfig, defaultModelConfig, defaultRunConfig);
                await expect(scope.runNonInteractive(new ContextState())).rejects.toThrow('API Failure');
                expect(scope.output.terminate_reason).toBe(SubagentTerminateMode.ERROR);
            });
        });
    });
});
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