/*
	Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Fosscord and Fosscord Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { FileStorage } from "./FileStorage";
import path from "path";
import fs from "fs";
import { S3 } from "@aws-sdk/client-s3";
import { S3Storage } from "./S3Storage";
process.cwd();

export interface Storage {
	set(path: string, data: Buffer): Promise<void>;
	get(path: string): Promise<Buffer | null>;
	delete(path: string): Promise<void>;
}

let storage: Storage;

if (process.env.STORAGE_PROVIDER === "file" || !process.env.STORAGE_PROVIDER) {
	let location = process.env.STORAGE_LOCATION;
	if (location) {
		location = path.resolve(location);
	} else {
		location = path.join(process.cwd(), "files");
	}
	// TODO: move this to some start func, so it doesn't run when server is imported
	//console.log(`[CDN] storage location: ${bgCyan(`${black(location)}`)}`);
	if (!fs.existsSync(location)) fs.mkdirSync(location);
	process.env.STORAGE_LOCATION = location;

	storage = new FileStorage();
} else if (process.env.STORAGE_PROVIDER === "s3") {
	const region = process.env.STORAGE_REGION,
		bucket = process.env.STORAGE_BUCKET;

	if (!region) {
		console.error(
			`[CDN] You must provide a region when using the S3 storage provider.`,
		);
		process.exit(1);
	}

	if (!bucket) {
		console.error(
			`[CDN] You must provide a bucket when using the S3 storage provider.`,
		);
		process.exit(1);
	}

	// in the S3 provider, this should be the root path in the bucket
	let location = process.env.STORAGE_LOCATION;

	if (!location) {
		console.warn(
			`[CDN] STORAGE_LOCATION unconfigured for S3 provider, defaulting to the bucket root...`,
		);
		location = undefined;
	}

	const client = new S3({ region });

	storage = new S3Storage(client, bucket, location);
}

export { storage };