/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { beforeEach, describe, it, expect, vi, afterEach } from 'vitest';
import { CodeAssistServer } from './server.js';
import { OAuth2Client } from 'google-auth-library';
import { UserTierId } from './types.js';
vi.mock('google-auth-library');
describe('CodeAssistServer', () => {
    beforeEach(() => {
        vi.resetAllMocks();
    });
    it('should be able to be constructed', () => {
        const auth = new OAuth2Client();
        const server = new CodeAssistServer(auth, 'test-project', {}, 'test-session', UserTierId.FREE);
        expect(server).toBeInstanceOf(CodeAssistServer);
    });
    it('should call the generateContent endpoint', async () => {
        const mockRequest = vi.fn();
        const client = { request: mockRequest };
        const server = new CodeAssistServer(client, 'test-project', { headers: { 'x-custom-header': 'test-value' } }, 'test-session', UserTierId.FREE);
        const mockResponseData = {
            response: {
                candidates: [
                    {
                        index: 0,
                        content: {
                            role: 'model',
                            parts: [{ text: 'response' }],
                        },
                        finishReason: 'STOP',
                        safetyRatings: [],
                    },
                ],
            },
        };
        mockRequest.mockResolvedValue({ data: mockResponseData });
        const response = await server.generateContent({
            model: 'test-model',
            contents: [{ role: 'user', parts: [{ text: 'request' }] }],
        }, 'user-prompt-id');
        expect(mockRequest).toHaveBeenCalledWith({
            url: expect.stringContaining(':generateContent'),
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'x-custom-header': 'test-value',
            },
            responseType: 'json',
            body: expect.any(String),
            signal: undefined,
        });
        const requestBody = JSON.parse(mockRequest.mock.calls[0][0].body);
        expect(requestBody.user_prompt_id).toBe('user-prompt-id');
        expect(requestBody.project).toBe('test-project');
        expect(response.candidates?.[0]?.content?.parts?.[0]?.text).toBe('response');
    });
    describe('getMethodUrl', () => {
        const originalEnv = process.env;
        beforeEach(() => {
            // Reset the environment variables to their original state
            process.env = { ...originalEnv };
        });
        afterEach(() => {
            // Restore the original environment variables
            process.env = originalEnv;
        });
        it('should construct the default URL correctly', () => {
            const server = new CodeAssistServer({});
            const url = server.getMethodUrl('testMethod');
            expect(url).toBe('https://cloudcode-pa.googleapis.com/v1internal:testMethod');
        });
        it('should use the CODE_ASSIST_ENDPOINT environment variable if set', () => {
            process.env['CODE_ASSIST_ENDPOINT'] = 'https://custom-endpoint.com';
            const server = new CodeAssistServer({});
            const url = server.getMethodUrl('testMethod');
            expect(url).toBe('https://custom-endpoint.com/v1internal:testMethod');
        });
    });
    it('should call the generateContentStream endpoint and parse SSE', async () => {
        const mockRequest = vi.fn();
        const client = { request: mockRequest };
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        // Create a mock readable stream
        const { Readable } = await import('node:stream');
        const mockStream = new Readable({
            read() { },
        });
        const mockResponseData1 = {
            response: { candidates: [{ content: { parts: [{ text: 'Hello' }] } }] },
        };
        const mockResponseData2 = {
            response: { candidates: [{ content: { parts: [{ text: ' World' }] } }] },
        };
        mockRequest.mockResolvedValue({ data: mockStream });
        const stream = await server.generateContentStream({
            model: 'test-model',
            contents: [{ role: 'user', parts: [{ text: 'request' }] }],
        }, 'user-prompt-id');
        // Push SSE data to the stream
        // Use setTimeout to ensure the stream processing has started
        setTimeout(() => {
            mockStream.push('data: ' + JSON.stringify(mockResponseData1) + '\n\n');
            mockStream.push('id: 123\n'); // Should be ignored
            mockStream.push('data: ' + JSON.stringify(mockResponseData2) + '\n\n');
            mockStream.push(null); // End the stream
        }, 0);
        const results = [];
        for await (const res of stream) {
            results.push(res);
        }
        expect(mockRequest).toHaveBeenCalledWith({
            url: expect.stringContaining(':streamGenerateContent'),
            method: 'POST',
            params: { alt: 'sse' },
            responseType: 'stream',
            body: expect.any(String),
            headers: {
                'Content-Type': 'application/json',
            },
            signal: undefined,
        });
        expect(results).toHaveLength(2);
        expect(results[0].candidates?.[0].content?.parts?.[0].text).toBe('Hello');
        expect(results[1].candidates?.[0].content?.parts?.[0].text).toBe(' World');
    });
    it('should ignore malformed SSE data', async () => {
        const mockRequest = vi.fn();
        const client = { request: mockRequest };
        const server = new CodeAssistServer(client);
        const { Readable } = await import('node:stream');
        const mockStream = new Readable({
            read() { },
        });
        mockRequest.mockResolvedValue({ data: mockStream });
        const stream = await server.requestStreamingPost('testStream', {});
        setTimeout(() => {
            mockStream.push('this is a malformed line\n');
            mockStream.push(null);
        }, 0);
        const results = [];
        for await (const res of stream) {
            results.push(res);
        }
        expect(results).toHaveLength(0);
    });
    it('should call the onboardUser endpoint', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        const mockResponse = {
            name: 'operations/123',
            done: true,
        };
        vi.spyOn(server, 'requestPost').mockResolvedValue(mockResponse);
        const response = await server.onboardUser({
            tierId: 'test-tier',
            cloudaicompanionProject: 'test-project',
            metadata: {},
        });
        expect(server.requestPost).toHaveBeenCalledWith('onboardUser', expect.any(Object));
        expect(response.name).toBe('operations/123');
    });
    it('should call the loadCodeAssist endpoint', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        const mockResponse = {
            currentTier: {
                id: UserTierId.FREE,
                name: 'Free',
                description: 'free tier',
            },
            allowedTiers: [],
            ineligibleTiers: [],
            cloudaicompanionProject: 'projects/test',
        };
        vi.spyOn(server, 'requestPost').mockResolvedValue(mockResponse);
        const response = await server.loadCodeAssist({
            metadata: {},
        });
        expect(server.requestPost).toHaveBeenCalledWith('loadCodeAssist', expect.any(Object));
        expect(response).toEqual(mockResponse);
    });
    it('should return 0 for countTokens', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        const mockResponse = {
            totalTokens: 100,
        };
        vi.spyOn(server, 'requestPost').mockResolvedValue(mockResponse);
        const response = await server.countTokens({
            model: 'test-model',
            contents: [{ role: 'user', parts: [{ text: 'request' }] }],
        });
        expect(response.totalTokens).toBe(100);
    });
    it('should throw an error for embedContent', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        await expect(server.embedContent({
            model: 'test-model',
            contents: [{ role: 'user', parts: [{ text: 'request' }] }],
        })).rejects.toThrow();
    });
    it('should handle VPC-SC errors when calling loadCodeAssist', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        const mockVpcScError = {
            response: {
                data: {
                    error: {
                        details: [
                            {
                                reason: 'SECURITY_POLICY_VIOLATED',
                            },
                        ],
                    },
                },
            },
        };
        vi.spyOn(server, 'requestPost').mockRejectedValue(mockVpcScError);
        const response = await server.loadCodeAssist({
            metadata: {},
        });
        expect(server.requestPost).toHaveBeenCalledWith('loadCodeAssist', expect.any(Object));
        expect(response).toEqual({
            currentTier: { id: UserTierId.STANDARD },
        });
    });
    it('should re-throw non-VPC-SC errors from loadCodeAssist', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client);
        const genericError = new Error('Something else went wrong');
        vi.spyOn(server, 'requestPost').mockRejectedValue(genericError);
        await expect(server.loadCodeAssist({ metadata: {} })).rejects.toThrow('Something else went wrong');
        expect(server.requestPost).toHaveBeenCalledWith('loadCodeAssist', expect.any(Object));
    });
    it('should call the listExperiments endpoint with metadata', async () => {
        const client = new OAuth2Client();
        const server = new CodeAssistServer(client, 'test-project', {}, 'test-session', UserTierId.FREE);
        const mockResponse = {
            experiments: [],
        };
        vi.spyOn(server, 'requestPost').mockResolvedValue(mockResponse);
        const metadata = {
            ideVersion: 'v0.1.0',
        };
        const response = await server.listExperiments(metadata);
        expect(server.requestPost).toHaveBeenCalledWith('listExperiments', {
            project: 'test-project',
            metadata: { ideVersion: 'v0.1.0', duetProject: 'test-project' },
        });
        expect(response).toEqual(mockResponse);
    });
});
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