import { readdir, stat } from 'node:fs/promises';
import { join } from 'node:path';
async function findFilesInDir(dir, pattern) {
    try {
        const files = await readdir(dir);
        return files.filter(file => pattern.test(file));
    }
    catch {
        return [];
    }
}
/**
 * Validate and get files to include from a directory.
 * Throws if required files are missing or duplicated.
 * Returns included files and excluded (unexpected) files.
 */
export async function validateAndGetFilesFromDir(dir) {
    const filesToInclude = [];
    const excluded = [];
    const contentFiles = await findFilesInDir(dir, /^(content\.|index\.html$)/);
    if (contentFiles.length === 0) {
        throw new Error(`No content file found in ${dir} (e.g., content.md or index.html)`);
    }
    if (contentFiles.length > 1) {
        throw new Error(`Multiple content files found in ${dir}: ${contentFiles.join(', ')}`);
    }
    filesToInclude.push(contentFiles[0]);
    try {
        await stat(join(dir, 'settings.json'));
        filesToInclude.push('settings.json');
    }
    catch {
        throw new Error(`No settings.json file found in ${dir}`);
    }
    const dataFiles = await findFilesInDir(dir, /^data\./);
    if (dataFiles.length > 1) {
        throw new Error(`Multiple data files found in ${dir}: ${dataFiles.join(', ')}`);
    }
    if (dataFiles.length === 1) {
        filesToInclude.push(dataFiles[0]);
    }
    const optionalFiles = ['style.css', 'server.js', 'script.js'];
    for (const file of optionalFiles) {
        try {
            await stat(join(dir, file));
            filesToInclude.push(file);
        }
        catch {
            // File doesn't exist, skip
        }
    }
    const allFiles = await readdir(dir);
    const expectedPatterns = [
        /^content\./,
        /^index\.html$/,
        /^data\./,
        /^style\.css$/,
        /^server\.js$/,
        /^script\.js$/,
        /^settings\.json$/,
        /^\.git$/,
        /^template$/,
        /^slot$/,
        /^uploads$/,
    ];
    for (const file of allFiles) {
        const isExpected = expectedPatterns.some(pattern => pattern.test(file));
        if (!isExpected) {
            excluded.push(file);
        }
    }
    return { files: filesToInclude, excluded };
}
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