/**
 * One-time migration script: uploads/ -> S3-compatible object storage
 *
 * Reads all image files from the local uploads/ directory and uploads each
 * to the S3 bucket via the storage service. Preserves original filenames
 * as object keys.
 *
 * Prerequisites:
 *   - S3_ENDPOINT, S3_ACCESS_KEY, S3_SECRET_KEY env vars must be set
 *   - The S3 bucket must exist
 *
 * Usage:
 *   bun run scripts/migrate-images-to-s3.ts
 */

import { readdir } from "node:fs/promises";
import { extname, join } from "node:path";
import { uploadImage } from "../src/server/services/storage.service";

const UPLOADS_DIR = "uploads";

const CONTENT_TYPE_MAP: Record<string, string> = {
	".jpg": "image/jpeg",
	".jpeg": "image/jpeg",
	".png": "image/png",
	".webp": "image/webp",
};

const IMAGE_EXTENSIONS = new Set(Object.keys(CONTENT_TYPE_MAP));

async function main() {
	// Check if uploads/ directory exists
	try {
		await readdir(UPLOADS_DIR);
	} catch {
		console.log("No uploads directory found. Nothing to migrate.");
		process.exit(0);
	}

	// Read all files
	const allFiles = await readdir(UPLOADS_DIR);
	const imageFiles = allFiles.filter((f) =>
		IMAGE_EXTENSIONS.has(extname(f).toLowerCase()),
	);

	if (imageFiles.length === 0) {
		console.log("No image files found in uploads/. Nothing to migrate.");
		process.exit(0);
	}

	console.log(`Found ${imageFiles.length} images to migrate\n`);

	let success = 0;
	let failed = 0;

	for (const filename of imageFiles) {
		const filePath = join(UPLOADS_DIR, filename);
		const ext = extname(filename).toLowerCase();
		const contentType = CONTENT_TYPE_MAP[ext] ?? "application/octet-stream";

		try {
			const file = Bun.file(filePath);
			const buffer = await file.arrayBuffer();
			await uploadImage(Buffer.from(buffer), filename, contentType);
			success++;
			console.log(`  Migrated: ${filename}`);
		} catch (err) {
			failed++;
			console.error(
				`  FAILED: ${filename} - ${err instanceof Error ? err.message : String(err)}`,
			);
		}
	}

	console.log(
		`\nMigration complete: ${success}/${imageFiles.length} files migrated, ${failed} failures`,
	);

	if (failed > 0) {
		console.log("Re-run this script to retry failed uploads.");
	}

	console.log(
		"\nOriginal files preserved in uploads/. Delete manually after verifying: rm -rf uploads/",
	);
}

main().catch((err) => {
	console.error("Migration failed:", err);
	process.exit(1);
});