/**
 * @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 { glob } from 'glob';
import yaml from 'js-yaml';
import { debugLogger } from '../utils/debugLogger.js';
import { coreEvents } from '../utils/events.js';
export const FRONTMATTER_REGEX = /^---\r?\n([\s\S]*?)\r?\n---(?:\r?\n([\s\S]*))?/;
/**
 * Discovers and loads all skills in the provided directory.
 */
export async function loadSkillsFromDir(dir) {
    const discoveredSkills = [];
    try {
        const absoluteSearchPath = path.resolve(dir);
        const stats = await fs.stat(absoluteSearchPath).catch(() => null);
        if (!stats || !stats.isDirectory()) {
            return [];
        }
        const skillFiles = await glob(['SKILL.md', '*/SKILL.md'], {
            cwd: absoluteSearchPath,
            absolute: true,
            nodir: true,
        });
        for (const skillFile of skillFiles) {
            const metadata = await loadSkillFromFile(skillFile);
            if (metadata) {
                discoveredSkills.push(metadata);
            }
        }
        if (discoveredSkills.length === 0) {
            const files = await fs.readdir(absoluteSearchPath);
            if (files.length > 0) {
                debugLogger.debug(`Failed to load skills from ${absoluteSearchPath}. The directory is not empty but no valid skills were discovered. Please ensure SKILL.md files are present in subdirectories and have valid frontmatter.`);
            }
        }
    }
    catch (error) {
        coreEvents.emitFeedback('warning', `Error discovering skills in ${dir}:`, error);
    }
    return discoveredSkills;
}
/**
 * Loads a single skill from a SKILL.md file.
 */
export async function loadSkillFromFile(filePath) {
    try {
        const content = await fs.readFile(filePath, 'utf-8');
        const match = content.match(FRONTMATTER_REGEX);
        if (!match) {
            return null;
        }
        const frontmatter = yaml.load(match[1]);
        if (!frontmatter || typeof frontmatter !== 'object') {
            return null;
        }
        const { name, description } = frontmatter;
        if (typeof name !== 'string' || typeof description !== 'string') {
            return null;
        }
        return {
            name,
            description,
            location: filePath,
            body: match[2].trim(),
        };
    }
    catch (error) {
        debugLogger.log(`Error parsing skill file ${filePath}:`, error);
        return null;
    }
}
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