/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import * as fs from 'node:fs/promises';
import * as path from 'node:path';
import { getErrorMessage, isNodeError, unescapePath, } from '@google/gemini-cli-core';
import { ToolCallStatus } from '../types.js';
/**
 * Parses a query string to find all '@<path>' commands and text segments.
 * Handles \ escaped spaces within paths.
 */
function parseAllAtCommands(query) {
    const parts = [];
    let currentIndex = 0;
    while (currentIndex < query.length) {
        let atIndex = -1;
        let nextSearchIndex = currentIndex;
        // Find next unescaped '@'
        while (nextSearchIndex < query.length) {
            if (query[nextSearchIndex] === '@' &&
                (nextSearchIndex === 0 || query[nextSearchIndex - 1] !== '\\')) {
                atIndex = nextSearchIndex;
                break;
            }
            nextSearchIndex++;
        }
        if (atIndex === -1) {
            // No more @
            if (currentIndex < query.length) {
                parts.push({ type: 'text', content: query.substring(currentIndex) });
            }
            break;
        }
        // Add text before @
        if (atIndex > currentIndex) {
            parts.push({
                type: 'text',
                content: query.substring(currentIndex, atIndex),
            });
        }
        // Parse @path
        let pathEndIndex = atIndex + 1;
        let inEscape = false;
        while (pathEndIndex < query.length) {
            const char = query[pathEndIndex];
            if (inEscape) {
                inEscape = false;
            }
            else if (char === '\\') {
                inEscape = true;
            }
            else if (/[,\s;!?()[\]{}]/.test(char)) {
                // Path ends at first whitespace or punctuation not escaped
                break;
            }
            else if (char === '.') {
                // For . we need to be more careful - only terminate if followed by whitespace or end of string
                // This allows file extensions like .txt, .js but terminates at sentence endings like "file.txt. Next sentence"
                const nextChar = pathEndIndex + 1 < query.length ? query[pathEndIndex + 1] : '';
                if (nextChar === '' || /\s/.test(nextChar)) {
                    break;
                }
            }
            pathEndIndex++;
        }
        const rawAtPath = query.substring(atIndex, pathEndIndex);
        // unescapePath expects the @ symbol to be present, and will handle it.
        const atPath = unescapePath(rawAtPath);
        parts.push({ type: 'atPath', content: atPath });
        currentIndex = pathEndIndex;
    }
    // Filter out empty text parts that might result from consecutive @paths or leading/trailing spaces
    return parts.filter((part) => !(part.type === 'text' && part.content.trim() === ''));
}
/**
 * Processes user input potentially containing one or more '@<path>' commands.
 * If found, it attempts to read the specified files/directories using the
 * 'read_many_files' tool. The user query is modified to include resolved paths,
 * and the content of the files is appended in a structured block.
 *
 * @returns An object indicating whether the main hook should proceed with an
 *          LLM call and the processed query parts (including file content).
 */
export async function handleAtCommand({ query, config, addItem, onDebugMessage, messageId: userMessageTimestamp, signal, }) {
    const commandParts = parseAllAtCommands(query);
    const atPathCommandParts = commandParts.filter((part) => part.type === 'atPath');
    if (atPathCommandParts.length === 0) {
        return { processedQuery: [{ text: query }], shouldProceed: true };
    }
    // Get centralized file discovery service
    const fileDiscovery = config.getFileService();
    const respectFileIgnore = config.getFileFilteringOptions();
    const pathSpecsToRead = [];
    const atPathToResolvedSpecMap = new Map();
    const contentLabelsForDisplay = [];
    const ignoredByReason = {
        git: [],
        gemini: [],
        both: [],
    };
    const toolRegistry = config.getToolRegistry();
    const readManyFilesTool = toolRegistry.getTool('read_many_files');
    const globTool = toolRegistry.getTool('glob');
    if (!readManyFilesTool) {
        addItem({ type: 'error', text: 'Error: read_many_files tool not found.' }, userMessageTimestamp);
        return { processedQuery: null, shouldProceed: false };
    }
    for (const atPathPart of atPathCommandParts) {
        const originalAtPath = atPathPart.content; // e.g., "@file.txt" or "@"
        if (originalAtPath === '@') {
            onDebugMessage('Lone @ detected, will be treated as text in the modified query.');
            continue;
        }
        const pathName = originalAtPath.substring(1);
        if (!pathName) {
            // This case should ideally not be hit if parseAllAtCommands ensures content after @
            // but as a safeguard:
            addItem({
                type: 'error',
                text: `Error: Invalid @ command '${originalAtPath}'. No path specified.`,
            }, userMessageTimestamp);
            // Decide if this is a fatal error for the whole command or just skip this @ part
            // For now, let's be strict and fail the command if one @path is malformed.
            return { processedQuery: null, shouldProceed: false };
        }
        // Check if path should be ignored based on filtering options
        const workspaceContext = config.getWorkspaceContext();
        if (!workspaceContext.isPathWithinWorkspace(pathName)) {
            onDebugMessage(`Path ${pathName} is not in the workspace and will be skipped.`);
            continue;
        }
        const gitIgnored = respectFileIgnore.respectGitIgnore &&
            fileDiscovery.shouldIgnoreFile(pathName, {
                respectGitIgnore: true,
                respectGeminiIgnore: false,
            });
        const geminiIgnored = respectFileIgnore.respectGeminiIgnore &&
            fileDiscovery.shouldIgnoreFile(pathName, {
                respectGitIgnore: false,
                respectGeminiIgnore: true,
            });
        if (gitIgnored || geminiIgnored) {
            const reason = gitIgnored && geminiIgnored ? 'both' : gitIgnored ? 'git' : 'gemini';
            ignoredByReason[reason].push(pathName);
            const reasonText = reason === 'both'
                ? 'ignored by both git and gemini'
                : reason === 'git'
                    ? 'git-ignored'
                    : 'gemini-ignored';
            onDebugMessage(`Path ${pathName} is ${reasonText} and will be skipped.`);
            continue;
        }
        for (const dir of config.getWorkspaceContext().getDirectories()) {
            let currentPathSpec = pathName;
            let resolvedSuccessfully = false;
            try {
                const absolutePath = path.resolve(dir, pathName);
                const stats = await fs.stat(absolutePath);
                if (stats.isDirectory()) {
                    currentPathSpec =
                        pathName + (pathName.endsWith(path.sep) ? `**` : `/**`);
                    onDebugMessage(`Path ${pathName} resolved to directory, using glob: ${currentPathSpec}`);
                }
                else {
                    onDebugMessage(`Path ${pathName} resolved to file: ${absolutePath}`);
                }
                resolvedSuccessfully = true;
            }
            catch (error) {
                if (isNodeError(error) && error.code === 'ENOENT') {
                    if (config.getEnableRecursiveFileSearch() && globTool) {
                        onDebugMessage(`Path ${pathName} not found directly, attempting glob search.`);
                        try {
                            const globResult = await globTool.buildAndExecute({
                                pattern: `**/*${pathName}*`,
                                path: dir,
                            }, signal);
                            if (globResult.llmContent &&
                                typeof globResult.llmContent === 'string' &&
                                !globResult.llmContent.startsWith('No files found') &&
                                !globResult.llmContent.startsWith('Error:')) {
                                const lines = globResult.llmContent.split('\n');
                                if (lines.length > 1 && lines[1]) {
                                    const firstMatchAbsolute = lines[1].trim();
                                    currentPathSpec = path.relative(dir, firstMatchAbsolute);
                                    onDebugMessage(`Glob search for ${pathName} found ${firstMatchAbsolute}, using relative path: ${currentPathSpec}`);
                                    resolvedSuccessfully = true;
                                }
                                else {
                                    onDebugMessage(`Glob search for '**/*${pathName}*' did not return a usable path. Path ${pathName} will be skipped.`);
                                }
                            }
                            else {
                                onDebugMessage(`Glob search for '**/*${pathName}*' found no files or an error. Path ${pathName} will be skipped.`);
                            }
                        }
                        catch (globError) {
                            console.error(`Error during glob search for ${pathName}: ${getErrorMessage(globError)}`);
                            onDebugMessage(`Error during glob search for ${pathName}. Path ${pathName} will be skipped.`);
                        }
                    }
                    else {
                        onDebugMessage(`Glob tool not found. Path ${pathName} will be skipped.`);
                    }
                }
                else {
                    console.error(`Error stating path ${pathName}: ${getErrorMessage(error)}`);
                    onDebugMessage(`Error stating path ${pathName}. Path ${pathName} will be skipped.`);
                }
            }
            if (resolvedSuccessfully) {
                pathSpecsToRead.push(currentPathSpec);
                atPathToResolvedSpecMap.set(originalAtPath, currentPathSpec);
                contentLabelsForDisplay.push(pathName);
                break;
            }
        }
    }
    // Construct the initial part of the query for the LLM
    let initialQueryText = '';
    for (let i = 0; i < commandParts.length; i++) {
        const part = commandParts[i];
        if (part.type === 'text') {
            initialQueryText += part.content;
        }
        else {
            // type === 'atPath'
            const resolvedSpec = atPathToResolvedSpecMap.get(part.content);
            if (i > 0 &&
                initialQueryText.length > 0 &&
                !initialQueryText.endsWith(' ')) {
                // Add space if previous part was text and didn't end with space, or if previous was @path
                const prevPart = commandParts[i - 1];
                if (prevPart.type === 'text' ||
                    (prevPart.type === 'atPath' &&
                        atPathToResolvedSpecMap.has(prevPart.content))) {
                    initialQueryText += ' ';
                }
            }
            if (resolvedSpec) {
                initialQueryText += `@${resolvedSpec}`;
            }
            else {
                // If not resolved for reading (e.g. lone @ or invalid path that was skipped),
                // add the original @-string back, ensuring spacing if it's not the first element.
                if (i > 0 &&
                    initialQueryText.length > 0 &&
                    !initialQueryText.endsWith(' ') &&
                    !part.content.startsWith(' ')) {
                    initialQueryText += ' ';
                }
                initialQueryText += part.content;
            }
        }
    }
    initialQueryText = initialQueryText.trim();
    // Inform user about ignored paths
    const totalIgnored = ignoredByReason['git'].length +
        ignoredByReason['gemini'].length +
        ignoredByReason['both'].length;
    if (totalIgnored > 0) {
        const messages = [];
        if (ignoredByReason['git'].length) {
            messages.push(`Git-ignored: ${ignoredByReason['git'].join(', ')}`);
        }
        if (ignoredByReason['gemini'].length) {
            messages.push(`Gemini-ignored: ${ignoredByReason['gemini'].join(', ')}`);
        }
        if (ignoredByReason['both'].length) {
            messages.push(`Ignored by both: ${ignoredByReason['both'].join(', ')}`);
        }
        const message = `Ignored ${totalIgnored} files:\n${messages.join('\n')}`;
        console.log(message);
        onDebugMessage(message);
    }
    // Fallback for lone "@" or completely invalid @-commands resulting in empty initialQueryText
    if (pathSpecsToRead.length === 0) {
        onDebugMessage('No valid file paths found in @ commands to read.');
        if (initialQueryText === '@' && query.trim() === '@') {
            // If the only thing was a lone @, pass original query (which might have spaces)
            return { processedQuery: [{ text: query }], shouldProceed: true };
        }
        else if (!initialQueryText && query) {
            // If all @-commands were invalid and no surrounding text, pass original query
            return { processedQuery: [{ text: query }], shouldProceed: true };
        }
        // Otherwise, proceed with the (potentially modified) query text that doesn't involve file reading
        return {
            processedQuery: [{ text: initialQueryText || query }],
            shouldProceed: true,
        };
    }
    const processedQueryParts = [{ text: initialQueryText }];
    const toolArgs = {
        paths: pathSpecsToRead,
        file_filtering_options: {
            respect_git_ignore: respectFileIgnore.respectGitIgnore,
            respect_gemini_ignore: respectFileIgnore.respectGeminiIgnore,
        },
        // Use configuration setting
    };
    let toolCallDisplay;
    let invocation = undefined;
    try {
        invocation = readManyFilesTool.build(toolArgs);
        const result = await invocation.execute(signal);
        toolCallDisplay = {
            callId: `client-read-${userMessageTimestamp}`,
            name: readManyFilesTool.displayName,
            description: invocation.getDescription(),
            status: ToolCallStatus.Success,
            resultDisplay: result.returnDisplay ||
                `Successfully read: ${contentLabelsForDisplay.join(', ')}`,
            confirmationDetails: undefined,
        };
        if (Array.isArray(result.llmContent)) {
            const fileContentRegex = /^--- (.*?) ---\n\n([\s\S]*?)\n\n$/;
            processedQueryParts.push({
                text: '\n--- Content from referenced files ---',
            });
            for (const part of result.llmContent) {
                if (typeof part === 'string') {
                    const match = fileContentRegex.exec(part);
                    if (match) {
                        const filePathSpecInContent = match[1]; // This is a resolved pathSpec
                        const fileActualContent = match[2].trim();
                        processedQueryParts.push({
                            text: `\nContent from @${filePathSpecInContent}:\n`,
                        });
                        processedQueryParts.push({ text: fileActualContent });
                    }
                    else {
                        processedQueryParts.push({ text: part });
                    }
                }
                else {
                    // part is a Part object.
                    processedQueryParts.push(part);
                }
            }
        }
        else {
            onDebugMessage('read_many_files tool returned no content or empty content.');
        }
        addItem({ type: 'tool_group', tools: [toolCallDisplay] }, userMessageTimestamp);
        return { processedQuery: processedQueryParts, shouldProceed: true };
    }
    catch (error) {
        toolCallDisplay = {
            callId: `client-read-${userMessageTimestamp}`,
            name: readManyFilesTool.displayName,
            description: invocation?.getDescription() ??
                'Error attempting to execute tool to read files',
            status: ToolCallStatus.Error,
            resultDisplay: `Error reading files (${contentLabelsForDisplay.join(', ')}): ${getErrorMessage(error)}`,
            confirmationDetails: undefined,
        };
        addItem({ type: 'tool_group', tools: [toolCallDisplay] }, userMessageTimestamp);
        return { processedQuery: null, shouldProceed: false };
    }
}
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