/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * Terminal setup utility for configuring Shift+Enter and Ctrl+Enter support.
 *
 * This module provides automatic detection and configuration of various terminal
 * emulators to support multiline input through modified Enter keys.
 *
 * Supported terminals:
 * - VS Code: Configures keybindings.json to send \\\r\n
 * - Cursor: Configures keybindings.json to send \\\r\n (VS Code fork)
 * - Windsurf: Configures keybindings.json to send \\\r\n (VS Code fork)
 *
 * For VS Code and its forks:
 * - Shift+Enter: Sends \\\r\n (backslash followed by CRLF)
 * - Ctrl+Enter: Sends \\\r\n (backslash followed by CRLF)
 *
 * The module will not modify existing shift+enter or ctrl+enter keybindings
 * to avoid conflicts with user customizations.
 */
import { promises as fs } from 'fs';
import * as os from 'os';
import * as path from 'path';
import { exec } from 'child_process';
import { promisify } from 'util';
import { isKittyProtocolEnabled } from './kittyProtocolDetector.js';
import { VSCODE_SHIFT_ENTER_SEQUENCE } from './platformConstants.js';
const execAsync = promisify(exec);
/**
 * Removes single-line JSON comments (// ...) from a string to allow parsing
 * VS Code style JSON files that may contain comments.
 */
function stripJsonComments(content) {
    // Remove single-line comments (// ...)
    return content.replace(/^\s*\/\/.*$/gm, '');
}
// Terminal detection
async function detectTerminal() {
    const termProgram = process.env.TERM_PROGRAM;
    // Check VS Code and its forks - check forks first to avoid false positives
    // Check for Cursor-specific indicators
    if (process.env.CURSOR_TRACE_ID ||
        process.env.VSCODE_GIT_ASKPASS_MAIN?.toLowerCase().includes('cursor')) {
        return 'cursor';
    }
    // Check for Windsurf-specific indicators
    if (process.env.VSCODE_GIT_ASKPASS_MAIN?.toLowerCase().includes('windsurf')) {
        return 'windsurf';
    }
    // Check VS Code last since forks may also set VSCODE env vars
    if (termProgram === 'vscode' || process.env.VSCODE_GIT_IPC_HANDLE) {
        return 'vscode';
    }
    // Check parent process name
    if (os.platform() !== 'win32') {
        try {
            const { stdout } = await execAsync('ps -o comm= -p $PPID');
            const parentName = stdout.trim();
            // Check forks before VS Code to avoid false positives
            if (parentName.includes('windsurf') || parentName.includes('Windsurf'))
                return 'windsurf';
            if (parentName.includes('cursor') || parentName.includes('Cursor'))
                return 'cursor';
            if (parentName.includes('code') || parentName.includes('Code'))
                return 'vscode';
        }
        catch (error) {
            // Continue detection even if process check fails
            console.debug('Parent process detection failed:', error);
        }
    }
    return null;
}
// Backup file helper
async function backupFile(filePath) {
    try {
        const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
        const backupPath = `${filePath}.backup.${timestamp}`;
        await fs.copyFile(filePath, backupPath);
    }
    catch (error) {
        // Log backup errors but continue with operation
        console.warn(`Failed to create backup of ${filePath}:`, error);
    }
}
// Helper function to get VS Code-style config directory
function getVSCodeStyleConfigDir(appName) {
    const platform = os.platform();
    if (platform === 'darwin') {
        return path.join(os.homedir(), 'Library', 'Application Support', appName, 'User');
    }
    else if (platform === 'win32') {
        if (!process.env.APPDATA) {
            return null;
        }
        return path.join(process.env.APPDATA, appName, 'User');
    }
    else {
        return path.join(os.homedir(), '.config', appName, 'User');
    }
}
// Generic VS Code-style terminal configuration
async function configureVSCodeStyle(terminalName, appName) {
    const configDir = getVSCodeStyleConfigDir(appName);
    if (!configDir) {
        return {
            success: false,
            message: `Could not determine ${terminalName} config path on Windows: APPDATA environment variable is not set.`,
        };
    }
    const keybindingsFile = path.join(configDir, 'keybindings.json');
    try {
        await fs.mkdir(configDir, { recursive: true });
        let keybindings = [];
        try {
            const content = await fs.readFile(keybindingsFile, 'utf8');
            await backupFile(keybindingsFile);
            try {
                const cleanContent = stripJsonComments(content);
                const parsedContent = JSON.parse(cleanContent);
                if (!Array.isArray(parsedContent)) {
                    return {
                        success: false,
                        message: `${terminalName} keybindings.json exists but is not a valid JSON array. ` +
                            `Please fix the file manually or delete it to allow automatic configuration.\n` +
                            `File: ${keybindingsFile}`,
                    };
                }
                keybindings = parsedContent;
            }
            catch (parseError) {
                return {
                    success: false,
                    message: `Failed to parse ${terminalName} keybindings.json. The file contains invalid JSON.\n` +
                        `Please fix the file manually or delete it to allow automatic configuration.\n` +
                        `File: ${keybindingsFile}\n` +
                        `Error: ${parseError}`,
                };
            }
        }
        catch {
            // File doesn't exist, will create new one
        }
        const shiftEnterBinding = {
            key: 'shift+enter',
            command: 'workbench.action.terminal.sendSequence',
            when: 'terminalFocus',
            args: { text: VSCODE_SHIFT_ENTER_SEQUENCE },
        };
        const ctrlEnterBinding = {
            key: 'ctrl+enter',
            command: 'workbench.action.terminal.sendSequence',
            when: 'terminalFocus',
            args: { text: VSCODE_SHIFT_ENTER_SEQUENCE },
        };
        // Check if ANY shift+enter or ctrl+enter bindings already exist
        const existingShiftEnter = keybindings.find((kb) => {
            const binding = kb;
            return binding.key === 'shift+enter';
        });
        const existingCtrlEnter = keybindings.find((kb) => {
            const binding = kb;
            return binding.key === 'ctrl+enter';
        });
        if (existingShiftEnter || existingCtrlEnter) {
            const messages = [];
            if (existingShiftEnter) {
                messages.push(`- Shift+Enter binding already exists`);
            }
            if (existingCtrlEnter) {
                messages.push(`- Ctrl+Enter binding already exists`);
            }
            return {
                success: false,
                message: `Existing keybindings detected. Will not modify to avoid conflicts.\n` +
                    messages.join('\n') +
                    '\n' +
                    `Please check and modify manually if needed: ${keybindingsFile}`,
            };
        }
        // Check if our specific bindings already exist
        const hasOurShiftEnter = keybindings.some((kb) => {
            const binding = kb;
            return (binding.key === 'shift+enter' &&
                binding.command === 'workbench.action.terminal.sendSequence' &&
                binding.args?.text === '\\\r\n');
        });
        const hasOurCtrlEnter = keybindings.some((kb) => {
            const binding = kb;
            return (binding.key === 'ctrl+enter' &&
                binding.command === 'workbench.action.terminal.sendSequence' &&
                binding.args?.text === '\\\r\n');
        });
        if (!hasOurShiftEnter || !hasOurCtrlEnter) {
            if (!hasOurShiftEnter)
                keybindings.unshift(shiftEnterBinding);
            if (!hasOurCtrlEnter)
                keybindings.unshift(ctrlEnterBinding);
            await fs.writeFile(keybindingsFile, JSON.stringify(keybindings, null, 4));
            return {
                success: true,
                message: `Added Shift+Enter and Ctrl+Enter keybindings to ${terminalName}.\nModified: ${keybindingsFile}`,
                requiresRestart: true,
            };
        }
        else {
            return {
                success: true,
                message: `${terminalName} keybindings already configured.`,
            };
        }
    }
    catch (error) {
        return {
            success: false,
            message: `Failed to configure ${terminalName}.\nFile: ${keybindingsFile}\nError: ${error}`,
        };
    }
}
// Terminal-specific configuration functions
async function configureVSCode() {
    return configureVSCodeStyle('VS Code', 'Code');
}
async function configureCursor() {
    return configureVSCodeStyle('Cursor', 'Cursor');
}
async function configureWindsurf() {
    return configureVSCodeStyle('Windsurf', 'Windsurf');
}
/**
 * Main terminal setup function that detects and configures the current terminal.
 *
 * This function:
 * 1. Detects the current terminal emulator
 * 2. Applies appropriate configuration for Shift+Enter and Ctrl+Enter support
 * 3. Creates backups of configuration files before modifying them
 *
 * @returns Promise<TerminalSetupResult> Result object with success status and message
 *
 * @example
 * const result = await terminalSetup();
 * if (result.success) {
 *   console.log(result.message);
 *   if (result.requiresRestart) {
 *     console.log('Please restart your terminal');
 *   }
 * }
 */
export async function terminalSetup() {
    // Check if terminal already has optimal keyboard support
    if (isKittyProtocolEnabled()) {
        return {
            success: true,
            message: 'Your terminal is already configured for an optimal experience with multiline input (Shift+Enter and Ctrl+Enter).',
        };
    }
    const terminal = await detectTerminal();
    if (!terminal) {
        return {
            success: false,
            message: 'Could not detect terminal type. Supported terminals: VS Code, Cursor, and Windsurf.',
        };
    }
    switch (terminal) {
        case 'vscode':
            return configureVSCode();
        case 'cursor':
            return configureCursor();
        case 'windsurf':
            return configureWindsurf();
        default:
            return {
                success: false,
                message: `Terminal "${terminal}" is not supported yet.`,
            };
    }
}
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