import * as fs from 'fs';
import { HandlerContext } from './types';
import { validatePath } from '../../security';
import { EXCLUDED_DIRS } from '../../config';

export async function applyListFilesActions(ctx: HandlerContext): Promise<void> {
    const { aiMessage, rootPath, report } = ctx;
    let match: RegExpExecArray | null;
    // Action 6: List Files
    const listRegex = /<list_files\s+path=['"]?([^'"]+)['"]?\s*\/?>(?:<\/list_files>)?/gi;
    while ((match = listRegex.exec(aiMessage)) !== null) {
        const relPath = match[1].trim() || '.';
        try {
            const absPath = validatePath(rootPath, relPath);
            if (fs.existsSync(absPath) && fs.statSync(absPath).isDirectory()) {
                const entries = fs.readdirSync(absPath, { withFileTypes: true });
                let listing = entries
                    .filter(e => !e.name.startsWith('.') && !EXCLUDED_DIRS.has(e.name))
                    .map(e => e.isDirectory() ? `${e.name}/` : e.name)
                    .join('\n');

                if (listing.length > 5000) {
                    listing = listing.slice(0, 5000) + "\n... (truncated for context)";
                }

                report.push(`📂 Listed: ${relPath}`);
                ctx.chatHistory.push({ role: 'system', content: `[Result of list_files ${relPath}]\n${listing}`, internal: true });
            }
        } catch (err: any) { report.push(`❌ Listing failed: ${err.message}`); }
    }
}