import { Storage } from "@google-cloud/storage";
import { Files } from "@google/genai";
import zlib from "zlib";
import { CLOUD_STORAGE_LOG_FOLDER_NAME } from "../../serverConfig";

const csClient = new Storage({projectId: process.env.PROJECT_ID});
const BUCKET_NAME = process.env.CLOUD_STORAGE_BUCKET_NAME || '';
const bucket = csClient.bucket(BUCKET_NAME);

export const storageController = {
	saveToGCS: async(folder: string, filename: string, content: any, contentType: string) => {
		const file = bucket.file((`${folder}/${filename}`));
		await file.save(content, {
            contentType: contentType,
		})
	},
	loadFromGCS: async(folder: string, filename: string): Promise<string | null> => {
		const file = bucket.file(`${folder}/${filename}`);
        console.log("loading file:", `${folder}/${filename}`);
		try {
			const [data] = await file.download();
			return zlib.gunzipSync(data).toString("utf-8");
		} catch (err: any) {
			return null;
		}
	},
	loadJsonFromGCS: async(folder: string, filename: string): Promise<string | null> => {
		const file = bucket.file(`${folder}/${filename}`);
        // console.log("loading file:", file.name);
		try {
			const [data] = await file.download();
			return data.toString("utf-8");
		} catch (err: any) {
			return null;
		}
	},
    existsInGCS: async(folder: string, filename: string): Promise<boolean> => {
		const file = bucket.file((`${folder}/${filename}`));
        console.log("checking file:", file.name);
		try {
			const [exist] = await file.exists();
			return exist;
		} catch (err: any) {
			return false;
		}
	},
	getFileList: async(): Promise<string[] | null> => {
		try {
			const results = await bucket.getFiles({
				prefix: 'request_log/',
			});
			const files = results[0];
			files.sort((a, b) => {
				if(!a.metadata.timeCreated || !b.metadata.timeCreated) return 0;
				 const timeA = new Date(a.metadata.timeCreated).getTime();
				 const timeB = new Date(b.metadata.timeCreated).getTime();
				 return timeA - timeB;
			});
			// for(const f of files[0]) {
			// 	list.push(f.name);
			// }
			return files.map((f) => f.name);
		} catch(error) {
			return null;
		}
	}
};