/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { DEFAULT_GEMINI_FLASH_MODEL } from '../config/models.js';
import { BaseLlmClient } from '../core/baseLlmClient.js';
import { checkNextSpeaker } from './nextSpeakerChecker.js';
import { GeminiChat } from '../core/geminiChat.js';
// Mock fs module to prevent actual file system operations during tests
const mockFileSystem = new Map();
vi.mock('node:fs', () => {
    const fsModule = {
        mkdirSync: vi.fn(),
        writeFileSync: vi.fn((path, data) => {
            mockFileSystem.set(path, data);
        }),
        readFileSync: vi.fn((path) => {
            if (mockFileSystem.has(path)) {
                return mockFileSystem.get(path);
            }
            throw Object.assign(new Error('ENOENT: no such file or directory'), {
                code: 'ENOENT',
            });
        }),
        existsSync: vi.fn((path) => mockFileSystem.has(path)),
    };
    return {
        default: fsModule,
        ...fsModule,
    };
});
// Mock GeminiClient and Config constructor
vi.mock('../core/baseLlmClient.js');
vi.mock('../config/config.js');
describe('checkNextSpeaker', () => {
    let chatInstance;
    let mockConfig;
    let mockBaseLlmClient;
    const abortSignal = new AbortController().signal;
    const promptId = 'test-prompt-id';
    beforeEach(() => {
        vi.resetAllMocks();
        mockConfig = {
            getProjectRoot: vi.fn().mockReturnValue('/test/project/root'),
            getSessionId: vi.fn().mockReturnValue('test-session-id'),
            getModel: () => 'test-model',
            storage: {
                getProjectTempDir: vi.fn().mockReturnValue('/test/temp'),
            },
        };
        mockBaseLlmClient = new BaseLlmClient({
            generateContent: vi.fn(),
            generateContentStream: vi.fn(),
            countTokens: vi.fn(),
            embedContent: vi.fn(),
        }, mockConfig);
        // GeminiChat will receive the mocked instances via the mocked GoogleGenAI constructor
        chatInstance = new GeminiChat(mockConfig, {}, []);
        // Spy on getHistory for chatInstance
        vi.spyOn(chatInstance, 'getHistory');
    });
    afterEach(() => {
        vi.restoreAllMocks();
    });
    it('should return null if history is empty', async () => {
        chatInstance.getHistory.mockReturnValue([]);
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
        expect(mockBaseLlmClient.generateJson).not.toHaveBeenCalled();
    });
    it('should return null if the last speaker was the user', async () => {
        vi.mocked(chatInstance.getHistory).mockReturnValue([
            { role: 'user', parts: [{ text: 'Hello' }] },
        ]);
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
        expect(mockBaseLlmClient.generateJson).not.toHaveBeenCalled();
    });
    it("should return { next_speaker: 'model' } when model intends to continue", async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'I will now do something.' }] },
        ]);
        const mockApiResponse = {
            reasoning: 'Model stated it will do something.',
            next_speaker: 'model',
        };
        mockBaseLlmClient.generateJson.mockResolvedValue(mockApiResponse);
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toEqual(mockApiResponse);
        expect(mockBaseLlmClient.generateJson).toHaveBeenCalledTimes(1);
    });
    it("should return { next_speaker: 'user' } when model asks a question", async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'What would you like to do?' }] },
        ]);
        const mockApiResponse = {
            reasoning: 'Model asked a question.',
            next_speaker: 'user',
        };
        mockBaseLlmClient.generateJson.mockResolvedValue(mockApiResponse);
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toEqual(mockApiResponse);
    });
    it("should return { next_speaker: 'user' } when model makes a statement", async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'This is a statement.' }] },
        ]);
        const mockApiResponse = {
            reasoning: 'Model made a statement, awaiting user input.',
            next_speaker: 'user',
        };
        mockBaseLlmClient.generateJson.mockResolvedValue(mockApiResponse);
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toEqual(mockApiResponse);
    });
    it('should return null if baseLlmClient.generateJson throws an error', async () => {
        const consoleWarnSpy = vi
            .spyOn(console, 'warn')
            .mockImplementation(() => { });
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'Some model output.' }] },
        ]);
        mockBaseLlmClient.generateJson.mockRejectedValue(new Error('API Error'));
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
        consoleWarnSpy.mockRestore();
    });
    it('should return null if baseLlmClient.generateJson returns invalid JSON (missing next_speaker)', async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'Some model output.' }] },
        ]);
        mockBaseLlmClient.generateJson.mockResolvedValue({
            reasoning: 'This is incomplete.',
        }); // Type assertion to simulate invalid response
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
    });
    it('should return null if baseLlmClient.generateJson returns a non-string next_speaker', async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'Some model output.' }] },
        ]);
        mockBaseLlmClient.generateJson.mockResolvedValue({
            reasoning: 'Model made a statement, awaiting user input.',
            next_speaker: 123, // Invalid type
        });
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
    });
    it('should return null if baseLlmClient.generateJson returns an invalid next_speaker string value', async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'Some model output.' }] },
        ]);
        mockBaseLlmClient.generateJson.mockResolvedValue({
            reasoning: 'Model made a statement, awaiting user input.',
            next_speaker: 'neither', // Invalid enum value
        });
        const result = await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(result).toBeNull();
    });
    it('should call generateJson with the correct parameters', async () => {
        chatInstance.getHistory.mockReturnValue([
            { role: 'model', parts: [{ text: 'Some model output.' }] },
        ]);
        const mockApiResponse = {
            reasoning: 'Model made a statement, awaiting user input.',
            next_speaker: 'user',
        };
        mockBaseLlmClient.generateJson.mockResolvedValue(mockApiResponse);
        await checkNextSpeaker(chatInstance, mockBaseLlmClient, abortSignal, promptId);
        expect(mockBaseLlmClient.generateJson).toHaveBeenCalled();
        const generateJsonCall = mockBaseLlmClient.generateJson.mock
            .calls[0];
        expect(generateJsonCall[0].model).toBe(DEFAULT_GEMINI_FLASH_MODEL);
        expect(generateJsonCall[0].promptId).toBe(promptId);
    });
});
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