import { promises as fs } from 'fs';
import { MergeStrategy } from '../types.js';

export async function mergeText(targetPath: string, sourcePath: string, strategy: MergeStrategy): Promise<string> {
	const targetContent = await fs.readFile(targetPath, 'utf-8');
	const sourceContent = await fs.readFile(sourcePath, 'utf-8');

	switch (strategy) {
		case 'append':
			return targetContent + '\n' + sourceContent;
		case 'prepend':
			return sourceContent + '\n' + targetContent;
		case 'replace':
			return sourceContent;
		default:
			throw new Error(`Unsupported merge strategy for text: ${strategy}`);
	}
}