import { mkdir, writeFile, unlink } from 'node:fs/promises';
import { join } from 'node:path';

const DATA_DIR = process.env.TASKPLANER_DATA_DIR || './data';
export const UPLOAD_DIR = join(DATA_DIR, 'uploads');
export const ORIGINALS_DIR = join(DATA_DIR, 'uploads/originals');
export const THUMBNAILS_DIR = join(DATA_DIR, 'uploads/thumbnails');

/**
 * Ensure upload directories exist
 */
export async function ensureDirectories(): Promise<void> {
	await mkdir(ORIGINALS_DIR, { recursive: true });
	await mkdir(THUMBNAILS_DIR, { recursive: true });
}

/**
 * Save original image to filesystem
 */
export async function saveOriginal(id: string, ext: string, buffer: Buffer): Promise<void> {
	const path = getOriginalPath(id, ext);
	await writeFile(path, buffer);
}

/**
 * Save thumbnail to filesystem (always jpg)
 */
export async function saveThumbnail(id: string, buffer: Buffer): Promise<void> {
	const path = getThumbnailPath(id);
	await writeFile(path, buffer);
}

/**
 * Get path to original image
 */
export function getOriginalPath(id: string, ext: string): string {
	return join(ORIGINALS_DIR, `${id}.${ext}`);
}

/**
 * Get path to thumbnail (always jpg)
 */
export function getThumbnailPath(id: string): string {
	return join(THUMBNAILS_DIR, `${id}.jpg`);
}

/**
 * Delete both original and thumbnail files
 * Does not throw if files don't exist
 */
export async function deleteImage(id: string, ext: string): Promise<void> {
	try {
		await unlink(getOriginalPath(id, ext));
	} catch {
		// File may not exist, ignore
	}
	try {
		await unlink(getThumbnailPath(id));
	} catch {
		// File may not exist, ignore
	}
}