/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { vi, describe, it, expect, beforeEach, afterEach } from 'vitest';
import { MemoryTool, setGeminiMdFilename, getCurrentGeminiMdFilename, getAllGeminiMdFilenames, DEFAULT_CONTEXT_FILENAME, } from './memoryTool.js';
import * as fs from 'fs/promises';
import * as path from 'path';
import * as os from 'os';
import { ToolConfirmationOutcome } from './tools.js';
// Mock dependencies
vi.mock('fs/promises');
vi.mock('os');
const MEMORY_SECTION_HEADER = '## Qwen Added Memories';
describe('MemoryTool', () => {
    const mockAbortSignal = new AbortController().signal;
    const mockFsAdapter = {
        readFile: vi.fn(),
        writeFile: vi.fn(),
        mkdir: vi.fn(),
    };
    beforeEach(() => {
        vi.mocked(os.homedir).mockReturnValue(path.join('/mock', 'home'));
        mockFsAdapter.readFile.mockReset();
        mockFsAdapter.writeFile.mockReset().mockResolvedValue(undefined);
        mockFsAdapter.mkdir
            .mockReset()
            .mockResolvedValue(undefined);
    });
    afterEach(() => {
        vi.restoreAllMocks();
        // Reset GEMINI_MD_FILENAME to its original value after each test
        setGeminiMdFilename(DEFAULT_CONTEXT_FILENAME);
    });
    describe('setGeminiMdFilename', () => {
        it('should update currentGeminiMdFilename when a valid new name is provided', () => {
            const newName = 'CUSTOM_CONTEXT.md';
            setGeminiMdFilename(newName);
            expect(getCurrentGeminiMdFilename()).toBe(newName);
        });
        it('should not update currentGeminiMdFilename if the new name is empty or whitespace', () => {
            const initialName = getCurrentGeminiMdFilename(); // Get current before trying to change
            setGeminiMdFilename('  ');
            expect(getCurrentGeminiMdFilename()).toBe(initialName);
            setGeminiMdFilename('');
            expect(getCurrentGeminiMdFilename()).toBe(initialName);
        });
        it('should handle an array of filenames', () => {
            const newNames = ['CUSTOM_CONTEXT.md', 'ANOTHER_CONTEXT.md'];
            setGeminiMdFilename(newNames);
            expect(getCurrentGeminiMdFilename()).toBe('CUSTOM_CONTEXT.md');
            expect(getAllGeminiMdFilenames()).toEqual(newNames);
        });
    });
    describe('performAddMemoryEntry (static method)', () => {
        let testFilePath;
        beforeEach(() => {
            testFilePath = path.join(os.homedir(), '.qwen', DEFAULT_CONTEXT_FILENAME);
        });
        it('should create section and save a fact if file does not exist', async () => {
            mockFsAdapter.readFile.mockRejectedValue({ code: 'ENOENT' }); // Simulate file not found
            const fact = 'The sky is blue';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            expect(mockFsAdapter.mkdir).toHaveBeenCalledWith(path.dirname(testFilePath), {
                recursive: true,
            });
            expect(mockFsAdapter.writeFile).toHaveBeenCalledOnce();
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            expect(writeFileCall[0]).toBe(testFilePath);
            const expectedContent = `${MEMORY_SECTION_HEADER}\n- ${fact}\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
            expect(writeFileCall[2]).toBe('utf-8');
        });
        it('should create section and save a fact if file is empty', async () => {
            mockFsAdapter.readFile.mockResolvedValue(''); // Simulate empty file
            const fact = 'The sky is blue';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            const expectedContent = `${MEMORY_SECTION_HEADER}\n- ${fact}\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
        });
        it('should add a fact to an existing section', async () => {
            const initialContent = `Some preamble.\n\n${MEMORY_SECTION_HEADER}\n- Existing fact 1\n`;
            mockFsAdapter.readFile.mockResolvedValue(initialContent);
            const fact = 'New fact 2';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            expect(mockFsAdapter.writeFile).toHaveBeenCalledOnce();
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            const expectedContent = `Some preamble.\n\n${MEMORY_SECTION_HEADER}\n- Existing fact 1\n- ${fact}\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
        });
        it('should add a fact to an existing empty section', async () => {
            const initialContent = `Some preamble.\n\n${MEMORY_SECTION_HEADER}\n`; // Empty section
            mockFsAdapter.readFile.mockResolvedValue(initialContent);
            const fact = 'First fact in section';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            expect(mockFsAdapter.writeFile).toHaveBeenCalledOnce();
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            const expectedContent = `Some preamble.\n\n${MEMORY_SECTION_HEADER}\n- ${fact}\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
        });
        it('should add a fact when other ## sections exist and preserve spacing', async () => {
            const initialContent = `${MEMORY_SECTION_HEADER}\n- Fact 1\n\n## Another Section\nSome other text.`;
            mockFsAdapter.readFile.mockResolvedValue(initialContent);
            const fact = 'Fact 2';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            expect(mockFsAdapter.writeFile).toHaveBeenCalledOnce();
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            // Note: The implementation ensures a single newline at the end if content exists.
            const expectedContent = `${MEMORY_SECTION_HEADER}\n- Fact 1\n- ${fact}\n\n## Another Section\nSome other text.\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
        });
        it('should correctly trim and add a fact that starts with a dash', async () => {
            mockFsAdapter.readFile.mockResolvedValue(`${MEMORY_SECTION_HEADER}\n`);
            const fact = '- - My fact with dashes';
            await MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter);
            const writeFileCall = mockFsAdapter.writeFile.mock.calls[0];
            const expectedContent = `${MEMORY_SECTION_HEADER}\n- My fact with dashes\n`;
            expect(writeFileCall[1]).toBe(expectedContent);
        });
        it('should handle error from fsAdapter.writeFile', async () => {
            mockFsAdapter.readFile.mockResolvedValue('');
            mockFsAdapter.writeFile.mockRejectedValue(new Error('Disk full'));
            const fact = 'This will fail';
            await expect(MemoryTool.performAddMemoryEntry(fact, testFilePath, mockFsAdapter)).rejects.toThrow('[MemoryTool] Failed to add memory entry: Disk full');
        });
    });
    describe('execute (instance method)', () => {
        let memoryTool;
        let performAddMemoryEntrySpy;
        beforeEach(() => {
            memoryTool = new MemoryTool();
            // Spy on the static method for these tests
            performAddMemoryEntrySpy = vi
                .spyOn(MemoryTool, 'performAddMemoryEntry')
                .mockResolvedValue(undefined);
            // Cast needed as spyOn returns MockInstance
        });
        it('should have correct name, displayName, description, and schema', () => {
            expect(memoryTool.name).toBe('save_memory');
            expect(memoryTool.displayName).toBe('Save Memory');
            expect(memoryTool.description).toContain('Saves a specific piece of information');
            expect(memoryTool.schema).toBeDefined();
            expect(memoryTool.schema.name).toBe('save_memory');
            expect(memoryTool.schema.parametersJsonSchema).toBeDefined();
        });
        it('should call performAddMemoryEntry with correct parameters and return success', async () => {
            const params = { fact: 'The sky is blue', scope: 'global' };
            const result = await memoryTool.execute(params, mockAbortSignal);
            // Use getCurrentGeminiMdFilename for the default expectation before any setGeminiMdFilename calls in a test
            const expectedFilePath = path.join(os.homedir(), '.qwen', getCurrentGeminiMdFilename());
            // For this test, we expect the actual fs methods to be passed
            const expectedFsArgument = {
                readFile: fs.readFile,
                writeFile: fs.writeFile,
                mkdir: fs.mkdir,
            };
            expect(performAddMemoryEntrySpy).toHaveBeenCalledWith(params.fact, expectedFilePath, expectedFsArgument);
            const successMessage = `Okay, I've remembered that in global memory: "${params.fact}"`;
            expect(result.llmContent).toBe(JSON.stringify({ success: true, message: successMessage }));
            expect(result.returnDisplay).toBe(successMessage);
        });
        it('should return an error if fact is empty', async () => {
            const params = { fact: ' ' }; // Empty fact
            const result = await memoryTool.execute(params, mockAbortSignal);
            const errorMessage = 'Parameter "fact" must be a non-empty string.';
            expect(performAddMemoryEntrySpy).not.toHaveBeenCalled();
            expect(result.llmContent).toBe(JSON.stringify({ success: false, error: errorMessage }));
            expect(result.returnDisplay).toBe(`Error: ${errorMessage}`);
        });
        it('should handle errors from performAddMemoryEntry', async () => {
            const params = { fact: 'This will fail', scope: 'global' };
            const underlyingError = new Error('[MemoryTool] Failed to add memory entry: Disk full');
            performAddMemoryEntrySpy.mockRejectedValue(underlyingError);
            const result = await memoryTool.execute(params, mockAbortSignal);
            expect(result.llmContent).toBe(JSON.stringify({
                success: false,
                error: `Failed to save memory. Detail: ${underlyingError.message}`,
            }));
            expect(result.returnDisplay).toBe(`Error saving memory: ${underlyingError.message}`);
        });
    });
    describe('shouldConfirmExecute', () => {
        let memoryTool;
        beforeEach(() => {
            memoryTool = new MemoryTool();
            // Clear the allowlist before each test
            MemoryTool.allowlist.clear();
            // Mock fs.readFile to return empty string (file doesn't exist)
            vi.mocked(fs.readFile).mockResolvedValue('');
        });
        it('should return confirmation details when memory file is not allowlisted', async () => {
            const params = { fact: 'Test fact', scope: 'global' };
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBeDefined();
            expect(result).not.toBe(false);
            if (result && result.type === 'edit') {
                const expectedPath = path.join('~', '.qwen', 'QWEN.md');
                expect(result.title).toBe(`Confirm Memory Save: ${expectedPath} (global)`);
                expect(result.fileName).toContain(path.join('mock', 'home', '.qwen'));
                expect(result.fileName).toContain('QWEN.md');
                expect(result.fileDiff).toContain('Index: QWEN.md');
                expect(result.fileDiff).toContain('+## Qwen Added Memories');
                expect(result.fileDiff).toContain('+- Test fact');
                expect(result.originalContent).toBe('');
                expect(result.newContent).toContain('## Qwen Added Memories');
                expect(result.newContent).toContain('- Test fact');
            }
        });
        it('should return false when memory file is already allowlisted', async () => {
            const params = { fact: 'Test fact', scope: 'global' };
            const memoryFilePath = path.join(os.homedir(), '.qwen', getCurrentGeminiMdFilename());
            // Add the memory file to the allowlist with the new key format
            MemoryTool.allowlist.add(`${memoryFilePath}_global`);
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBe(false);
        });
        it('should add memory file to allowlist when ProceedAlways is confirmed', async () => {
            const params = { fact: 'Test fact', scope: 'global' };
            const memoryFilePath = path.join(os.homedir(), '.qwen', getCurrentGeminiMdFilename());
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBeDefined();
            expect(result).not.toBe(false);
            if (result && result.type === 'edit') {
                // Simulate the onConfirm callback
                await result.onConfirm(ToolConfirmationOutcome.ProceedAlways);
                // Check that the memory file was added to the allowlist with the new key format
                expect(MemoryTool.allowlist.has(`${memoryFilePath}_global`)).toBe(true);
            }
        });
        it('should not add memory file to allowlist when other outcomes are confirmed', async () => {
            const params = { fact: 'Test fact' };
            const memoryFilePath = path.join(os.homedir(), '.qwen', getCurrentGeminiMdFilename());
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBeDefined();
            expect(result).not.toBe(false);
            if (result && result.type === 'edit') {
                // Simulate the onConfirm callback with different outcomes
                await result.onConfirm(ToolConfirmationOutcome.ProceedOnce);
                expect(MemoryTool.allowlist.has(memoryFilePath)).toBe(false);
                await result.onConfirm(ToolConfirmationOutcome.Cancel);
                expect(MemoryTool.allowlist.has(memoryFilePath)).toBe(false);
            }
        });
        it('should handle existing memory file with content', async () => {
            const params = { fact: 'New fact', scope: 'global' };
            const existingContent = 'Some existing content.\n\n## Qwen Added Memories\n- Old fact\n';
            // Mock fs.readFile to return existing content
            vi.mocked(fs.readFile).mockResolvedValue(existingContent);
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBeDefined();
            expect(result).not.toBe(false);
            if (result && result.type === 'edit') {
                const expectedPath = path.join('~', '.qwen', 'QWEN.md');
                expect(result.title).toBe(`Confirm Memory Save: ${expectedPath} (global)`);
                expect(result.fileDiff).toContain('Index: QWEN.md');
                expect(result.fileDiff).toContain('+- New fact');
                expect(result.originalContent).toBe(existingContent);
                expect(result.newContent).toContain('- Old fact');
                expect(result.newContent).toContain('- New fact');
            }
        });
        it('should prompt for scope selection when scope is not specified', async () => {
            const params = { fact: 'Test fact' };
            const result = await memoryTool.shouldConfirmExecute(params, mockAbortSignal);
            expect(result).toBeDefined();
            expect(result).not.toBe(false);
            if (result && result.type === 'edit') {
                expect(result.title).toBe('Choose Memory Storage Location');
                expect(result.fileName).toBe('Memory Storage Options');
                expect(result.fileDiff).toContain('Choose where to save this memory');
                expect(result.fileDiff).toContain('Test fact');
                expect(result.fileDiff).toContain('Global:');
                expect(result.fileDiff).toContain('Project:');
                expect(result.originalContent).toBe('');
            }
        });
        it('should return error when executing without scope parameter', async () => {
            const params = { fact: 'Test fact' };
            const result = await memoryTool.execute(params, mockAbortSignal);
            expect(result.llmContent).toContain('Please specify where to save this memory');
            expect(result.returnDisplay).toContain('Global:');
            expect(result.returnDisplay).toContain('Project:');
        });
    });
});
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