/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { WebSearchTool } from './web-search.js';
import { GeminiClient } from '../core/client.js';
import { ToolErrorType } from './tool-error.js';
// Mock GeminiClient and Config constructor
vi.mock('../core/client.js');
vi.mock('../config/config.js');
describe('WebSearchTool', () => {
    const abortSignal = new AbortController().signal;
    let mockGeminiClient;
    let tool;
    beforeEach(() => {
        const mockConfigInstance = {
            getGeminiClient: () => mockGeminiClient,
            getProxy: () => undefined,
            generationConfigService: {
                getResolvedConfig: vi.fn().mockImplementation(({ model }) => ({
                    model,
                    sdkConfig: {},
                })),
            },
        };
        mockGeminiClient = new GeminiClient(mockConfigInstance);
        tool = new WebSearchTool(mockConfigInstance);
    });
    afterEach(() => {
        vi.restoreAllMocks();
    });
    describe('build', () => {
        it('should return an invocation for a valid query', () => {
            const params = { query: 'test query' };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
            expect(invocation.params).toEqual(params);
        });
        it('should throw an error for an empty query', () => {
            const params = { query: '' };
            expect(() => tool.build(params)).toThrow("The 'query' parameter cannot be empty.");
        });
        it('should throw an error for a query with only whitespace', () => {
            const params = { query: '   ' };
            expect(() => tool.build(params)).toThrow("The 'query' parameter cannot be empty.");
        });
    });
    describe('getDescription', () => {
        it('should return a description of the search', () => {
            const params = { query: 'test query' };
            const invocation = tool.build(params);
            expect(invocation.getDescription()).toBe('Searching the web for: "test query"');
        });
    });
    describe('execute', () => {
        it('should return search results for a successful query', async () => {
            const params = { query: 'successful query' };
            mockGeminiClient.generateContent.mockResolvedValue({
                candidates: [
                    {
                        content: {
                            role: 'model',
                            parts: [{ text: 'Here are your results.' }],
                        },
                    },
                ],
            });
            const invocation = tool.build(params);
            const result = await invocation.execute(abortSignal);
            expect(result.llmContent).toBe('Web search results for "successful query":\n\nHere are your results.');
            expect(result.returnDisplay).toBe('Search results for "successful query" returned.');
            expect(result.sources).toBeUndefined();
        });
        it('should handle no search results found', async () => {
            const params = { query: 'no results query' };
            mockGeminiClient.generateContent.mockResolvedValue({
                candidates: [
                    {
                        content: {
                            role: 'model',
                            parts: [{ text: '' }],
                        },
                    },
                ],
            });
            const invocation = tool.build(params);
            const result = await invocation.execute(abortSignal);
            expect(result.llmContent).toBe('No search results or information found for query: "no results query"');
            expect(result.returnDisplay).toBe('No information found.');
        });
        it('should return a WEB_SEARCH_FAILED error on failure', async () => {
            const params = { query: 'error query' };
            const testError = new Error('API Failure');
            mockGeminiClient.generateContent.mockRejectedValue(testError);
            const invocation = tool.build(params);
            const result = await invocation.execute(abortSignal);
            expect(result.error?.type).toBe(ToolErrorType.WEB_SEARCH_FAILED);
            expect(result.llmContent).toContain('Error:');
            expect(result.llmContent).toContain('API Failure');
            expect(result.returnDisplay).toBe('Error performing web search.');
        });
        it('should correctly format results with sources and citations', async () => {
            const params = { query: 'grounding query' };
            mockGeminiClient.generateContent.mockResolvedValue({
                candidates: [
                    {
                        content: {
                            role: 'model',
                            parts: [{ text: 'This is a test response.' }],
                        },
                        groundingMetadata: {
                            groundingChunks: [
                                { web: { uri: 'https://example.com', title: 'Example Site' } },
                                { web: { uri: 'https://google.com', title: 'Google' } },
                            ],
                            groundingSupports: [
                                {
                                    segment: { startIndex: 5, endIndex: 14 },
                                    groundingChunkIndices: [0],
                                },
                                {
                                    segment: { startIndex: 15, endIndex: 24 },
                                    groundingChunkIndices: [0, 1],
                                },
                            ],
                        },
                    },
                ],
            });
            const invocation = tool.build(params);
            const result = await invocation.execute(abortSignal);
            const expectedLlmContent = `Web search results for "grounding query":

This is a test[1] response.[1][2]

Sources:
[1] Example Site (https://example.com)
[2] Google (https://google.com)`;
            expect(result.llmContent).toBe(expectedLlmContent);
            expect(result.returnDisplay).toBe('Search results for "grounding query" returned.');
            expect(result.sources).toHaveLength(2);
        });
        it('should insert markers at correct byte positions for multibyte text', async () => {
            const params = { query: 'multibyte query' };
            mockGeminiClient.generateContent.mockResolvedValue({
                candidates: [
                    {
                        content: {
                            role: 'model',
                            parts: [{ text: 'こんにちは! Gemini CLI✨️' }],
                        },
                        groundingMetadata: {
                            groundingChunks: [
                                {
                                    web: {
                                        title: 'Japanese Greeting',
                                        uri: 'https://example.test/japanese-greeting',
                                    },
                                },
                                {
                                    web: {
                                        title: 'google-gemini/gemini-cli',
                                        uri: 'https://github.com/google-gemini/gemini-cli',
                                    },
                                },
                                {
                                    web: {
                                        title: 'Gemini CLI: your open-source AI agent',
                                        uri: 'https://blog.google/technology/developers/introducing-gemini-cli-open-source-ai-agent/',
                                    },
                                },
                            ],
                            groundingSupports: [
                                {
                                    segment: {
                                        // Byte range of "こんにちは!" (utf-8 encoded)
                                        startIndex: 0,
                                        endIndex: 16,
                                    },
                                    groundingChunkIndices: [0],
                                },
                                {
                                    segment: {
                                        // Byte range of "Gemini CLI✨️" (utf-8 encoded)
                                        startIndex: 17,
                                        endIndex: 33,
                                    },
                                    groundingChunkIndices: [1, 2],
                                },
                            ],
                        },
                    },
                ],
            });
            const invocation = tool.build(params);
            const result = await invocation.execute(abortSignal);
            const expectedLlmContent = `Web search results for "multibyte query":

こんにちは![1] Gemini CLI✨️[2][3]

Sources:
[1] Japanese Greeting (https://example.test/japanese-greeting)
[2] google-gemini/gemini-cli (https://github.com/google-gemini/gemini-cli)
[3] Gemini CLI: your open-source AI agent (https://blog.google/technology/developers/introducing-gemini-cli-open-source-ai-agent/)`;
            expect(result.llmContent).toBe(expectedLlmContent);
            expect(result.returnDisplay).toBe('Search results for "multibyte query" returned.');
            expect(result.sources).toHaveLength(3);
        });
    });
});
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