/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import fs from 'node:fs';
import path from 'node:path';
import os, { EOL } from 'node:os';
import crypto from 'node:crypto';
import { debugLogger } from '../index.js';
import { ToolErrorType } from './tool-error.js';
import { BaseDeclarativeTool, BaseToolInvocation, ToolConfirmationOutcome, Kind, } from './tools.js';
import { getErrorMessage } from '../utils/errors.js';
import { summarizeToolOutput } from '../utils/summarizer.js';
import { ShellExecutionService } from '../services/shellExecutionService.js';
import { formatMemoryUsage } from '../utils/formatters.js';
import { getCommandRoots, initializeShellParsers, stripShellWrapper, parseCommandDetails, hasRedirection, } from '../utils/shell-utils.js';
import { SHELL_TOOL_NAME } from './tool-names.js';
export const OUTPUT_UPDATE_INTERVAL_MS = 1000;
export class ShellToolInvocation extends BaseToolInvocation {
    config;
    constructor(config, params, messageBus, _toolName, _toolDisplayName) {
        super(params, messageBus, _toolName, _toolDisplayName);
        this.config = config;
    }
    getDescription() {
        let description = `${this.params.command}`;
        // append optional [in directory]
        // note description is needed even if validation fails due to absolute path
        if (this.params.dir_path) {
            description += ` [in ${this.params.dir_path}]`;
        }
        else {
            description += ` [current working directory ${process.cwd()}]`;
        }
        // append optional (description), replacing any line breaks with spaces
        if (this.params.description) {
            description += ` (${this.params.description.replace(/\n/g, ' ')})`;
        }
        return description;
    }
    getPolicyUpdateOptions(outcome) {
        if (outcome === ToolConfirmationOutcome.ProceedAlwaysAndSave ||
            outcome === ToolConfirmationOutcome.ProceedAlways) {
            const command = stripShellWrapper(this.params.command);
            const rootCommands = [...new Set(getCommandRoots(command))];
            if (rootCommands.length > 0) {
                return { commandPrefix: rootCommands };
            }
            return { commandPrefix: this.params.command };
        }
        return undefined;
    }
    async getConfirmationDetails(_abortSignal) {
        const command = stripShellWrapper(this.params.command);
        const parsed = parseCommandDetails(command);
        let rootCommandDisplay = '';
        if (!parsed || parsed.hasError || parsed.details.length === 0) {
            // Fallback if parser fails
            const fallback = command.trim().split(/\s+/)[0];
            rootCommandDisplay = fallback || 'shell command';
            if (hasRedirection(command)) {
                rootCommandDisplay += ', redirection';
            }
        }
        else {
            rootCommandDisplay = parsed.details
                .map((detail) => detail.name)
                .join(', ');
        }
        const rootCommands = [...new Set(getCommandRoots(command))];
        // Rely entirely on PolicyEngine for interactive confirmation.
        // If we are here, it means PolicyEngine returned ASK_USER (or no message bus),
        // so we must provide confirmation details.
        const confirmationDetails = {
            type: 'exec',
            title: 'Confirm Shell Command',
            command: this.params.command,
            rootCommand: rootCommandDisplay,
            rootCommands,
            onConfirm: async (outcome) => {
                await this.publishPolicyUpdate(outcome);
            },
        };
        return confirmationDetails;
    }
    async execute(signal, updateOutput, shellExecutionConfig, setPidCallback) {
        const strippedCommand = stripShellWrapper(this.params.command);
        if (signal.aborted) {
            return {
                llmContent: 'Command was cancelled by user before it could start.',
                returnDisplay: 'Command cancelled by user.',
            };
        }
        const isWindows = os.platform() === 'win32';
        const tempFileName = `shell_pgrep_${crypto
            .randomBytes(6)
            .toString('hex')}.tmp`;
        const tempFilePath = path.join(os.tmpdir(), tempFileName);
        const timeoutMs = this.config.getShellToolInactivityTimeout();
        const timeoutController = new AbortController();
        let timeoutTimer;
        // Handle signal combination manually to avoid TS issues or runtime missing features
        const combinedController = new AbortController();
        const onAbort = () => combinedController.abort();
        try {
            // pgrep is not available on Windows, so we can't get background PIDs
            const commandToExecute = isWindows
                ? strippedCommand
                : (() => {
                    // wrap command to append subprocess pids (via pgrep) to temporary file
                    let command = strippedCommand.trim();
                    if (!command.endsWith('&'))
                        command += ';';
                    return `{ ${command} }; __code=$?; pgrep -g 0 >${tempFilePath} 2>&1; exit $__code;`;
                })();
            const cwd = this.params.dir_path
                ? path.resolve(this.config.getTargetDir(), this.params.dir_path)
                : this.config.getTargetDir();
            let cumulativeOutput = '';
            let lastUpdateTime = Date.now();
            let isBinaryStream = false;
            const resetTimeout = () => {
                if (timeoutMs <= 0) {
                    return;
                }
                if (timeoutTimer)
                    clearTimeout(timeoutTimer);
                timeoutTimer = setTimeout(() => {
                    timeoutController.abort();
                }, timeoutMs);
            };
            signal.addEventListener('abort', onAbort, { once: true });
            timeoutController.signal.addEventListener('abort', onAbort, {
                once: true,
            });
            // Start timeout
            resetTimeout();
            const { result: resultPromise, pid } = await ShellExecutionService.execute(commandToExecute, cwd, (event) => {
                resetTimeout(); // Reset timeout on any event
                if (!updateOutput) {
                    return;
                }
                let shouldUpdate = false;
                switch (event.type) {
                    case 'data':
                        if (isBinaryStream)
                            break;
                        cumulativeOutput = event.chunk;
                        shouldUpdate = true;
                        break;
                    case 'binary_detected':
                        isBinaryStream = true;
                        cumulativeOutput =
                            '[Binary output detected. Halting stream...]';
                        shouldUpdate = true;
                        break;
                    case 'binary_progress':
                        isBinaryStream = true;
                        cumulativeOutput = `[Receiving binary output... ${formatMemoryUsage(event.bytesReceived)} received]`;
                        if (Date.now() - lastUpdateTime > OUTPUT_UPDATE_INTERVAL_MS) {
                            shouldUpdate = true;
                        }
                        break;
                    default: {
                        throw new Error('An unhandled ShellOutputEvent was found.');
                    }
                }
                if (shouldUpdate) {
                    updateOutput(cumulativeOutput);
                    lastUpdateTime = Date.now();
                }
            }, combinedController.signal, this.config.getEnableInteractiveShell(), {
                ...shellExecutionConfig,
                pager: 'cat',
                sanitizationConfig: shellExecutionConfig?.sanitizationConfig ??
                    this.config.sanitizationConfig,
            });
            if (pid && setPidCallback) {
                setPidCallback(pid);
            }
            const result = await resultPromise;
            const backgroundPIDs = [];
            if (os.platform() !== 'win32') {
                if (fs.existsSync(tempFilePath)) {
                    const pgrepLines = fs
                        .readFileSync(tempFilePath, 'utf8')
                        .split(EOL)
                        .filter(Boolean);
                    for (const line of pgrepLines) {
                        if (!/^\d+$/.test(line)) {
                            debugLogger.error(`pgrep: ${line}`);
                        }
                        const pid = Number(line);
                        if (pid !== result.pid) {
                            backgroundPIDs.push(pid);
                        }
                    }
                }
                else {
                    if (!signal.aborted) {
                        debugLogger.error('missing pgrep output');
                    }
                }
            }
            let llmContent = '';
            let timeoutMessage = '';
            if (result.aborted) {
                if (timeoutController.signal.aborted) {
                    timeoutMessage = `Command was automatically cancelled because it exceeded the timeout of ${(timeoutMs / 60000).toFixed(1)} minutes without output.`;
                    llmContent = timeoutMessage;
                }
                else {
                    llmContent =
                        'Command was cancelled by user before it could complete.';
                }
                if (result.output.trim()) {
                    llmContent += ` Below is the output before it was cancelled:\n${result.output}`;
                }
                else {
                    llmContent += ' There was no output before it was cancelled.';
                }
            }
            else {
                // Create a formatted error string for display, replacing the wrapper command
                // with the user-facing command.
                const finalError = result.error
                    ? result.error.message.replace(commandToExecute, this.params.command)
                    : '(none)';
                llmContent = [
                    `Command: ${this.params.command}`,
                    `Directory: ${this.params.dir_path || '(root)'}`,
                    `Output: ${result.output || '(empty)'}`,
                    `Error: ${finalError}`,
                    `Exit Code: ${result.exitCode ?? '(none)'}`,
                    `Signal: ${result.signal ?? '(none)'}`,
                    `Background PIDs: ${backgroundPIDs.length ? backgroundPIDs.join(', ') : '(none)'}`,
                    `Process Group PGID: ${result.pid ?? '(none)'}`,
                ].join('\n');
            }
            let returnDisplayMessage = '';
            if (this.config.getDebugMode()) {
                returnDisplayMessage = llmContent;
            }
            else {
                if (result.output.trim()) {
                    returnDisplayMessage = result.output;
                }
                else {
                    if (result.aborted) {
                        if (timeoutMessage) {
                            returnDisplayMessage = timeoutMessage;
                        }
                        else {
                            returnDisplayMessage = 'Command cancelled by user.';
                        }
                    }
                    else if (result.signal) {
                        returnDisplayMessage = `Command terminated by signal: ${result.signal}`;
                    }
                    else if (result.error) {
                        returnDisplayMessage = `Command failed: ${getErrorMessage(result.error)}`;
                    }
                    else if (result.exitCode !== null && result.exitCode !== 0) {
                        returnDisplayMessage = `Command exited with code: ${result.exitCode}`;
                    }
                    // If output is empty and command succeeded (code 0, no error/signal/abort),
                    // returnDisplayMessage will remain empty, which is fine.
                }
            }
            const summarizeConfig = this.config.getSummarizeToolOutputConfig();
            const executionError = result.error
                ? {
                    error: {
                        message: result.error.message,
                        type: ToolErrorType.SHELL_EXECUTE_ERROR,
                    },
                }
                : {};
            if (summarizeConfig && summarizeConfig[SHELL_TOOL_NAME]) {
                const summary = await summarizeToolOutput(this.config, { model: 'summarizer-shell' }, llmContent, this.config.getGeminiClient(), signal);
                return {
                    llmContent: summary,
                    returnDisplay: returnDisplayMessage,
                    ...executionError,
                };
            }
            return {
                llmContent,
                returnDisplay: returnDisplayMessage,
                ...executionError,
            };
        }
        finally {
            if (timeoutTimer)
                clearTimeout(timeoutTimer);
            signal.removeEventListener('abort', onAbort);
            timeoutController.signal.removeEventListener('abort', onAbort);
            if (fs.existsSync(tempFilePath)) {
                fs.unlinkSync(tempFilePath);
            }
        }
    }
}
function getShellToolDescription() {
    const returnedInfo = `

      The following information is returned:

      Command: Executed command.
      Directory: Directory where command was executed, or \`(root)\`.
      Stdout: Output on stdout stream. Can be \`(empty)\` or partial on error and for any unwaited background processes.
      Stderr: Output on stderr stream. Can be \`(empty)\` or partial on error and for any unwaited background processes.
      Error: Error or \`(none)\` if no error was reported for the subprocess.
      Exit Code: Exit code or \`(none)\` if terminated by signal.
      Signal: Signal number or \`(none)\` if no signal was received.
      Background PIDs: List of background processes started or \`(none)\`.
      Process Group PGID: Process group started or \`(none)\``;
    if (os.platform() === 'win32') {
        return `This tool executes a given shell command as \`powershell.exe -NoProfile -Command <command>\`. Command can start background processes using PowerShell constructs such as \`Start-Process -NoNewWindow\` or \`Start-Job\`.${returnedInfo}`;
    }
    else {
        return `This tool executes a given shell command as \`bash -c <command>\`. Command can start background processes using \`&\`. Command is executed as a subprocess that leads its own process group. Command process group can be terminated as \`kill -- -PGID\` or signaled as \`kill -s SIGNAL -- -PGID\`.${returnedInfo}`;
    }
}
function getCommandDescription() {
    if (os.platform() === 'win32') {
        return 'Exact command to execute as `powershell.exe -NoProfile -Command <command>`';
    }
    else {
        return 'Exact bash command to execute as `bash -c <command>`';
    }
}
export class ShellTool extends BaseDeclarativeTool {
    config;
    static Name = SHELL_TOOL_NAME;
    constructor(config, messageBus) {
        void initializeShellParsers().catch(() => {
            // Errors are surfaced when parsing commands.
        });
        super(ShellTool.Name, 'Shell', getShellToolDescription(), Kind.Execute, {
            type: 'object',
            properties: {
                command: {
                    type: 'string',
                    description: getCommandDescription(),
                },
                description: {
                    type: 'string',
                    description: 'Brief description of the command for the user. Be specific and concise. Ideally a single sentence. Can be up to 3 sentences for clarity. No line breaks.',
                },
                dir_path: {
                    type: 'string',
                    description: '(OPTIONAL) The path of the directory to run the command in. If not provided, the project root directory is used. Must be a directory within the workspace and must already exist.',
                },
            },
            required: ['command'],
        }, messageBus, false, // output is not markdown
        true);
        this.config = config;
    }
    validateToolParamValues(params) {
        if (!params.command.trim()) {
            return 'Command cannot be empty.';
        }
        if (params.dir_path) {
            const resolvedPath = path.resolve(this.config.getTargetDir(), params.dir_path);
            const workspaceContext = this.config.getWorkspaceContext();
            if (!workspaceContext.isPathWithinWorkspace(resolvedPath)) {
                return `Directory '${resolvedPath}' is not within any of the registered workspace directories.`;
            }
        }
        return null;
    }
    createInvocation(params, messageBus, _toolName, _toolDisplayName) {
        return new ShellToolInvocation(this.config, params, messageBus, _toolName, _toolDisplayName);
    }
}
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