import { Injectable, Logger, OnModuleInit } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import * as Minio from "minio";
import type { IStorageService } from "../common/interfaces/storage.interface";

@Injectable()
export class S3Service implements OnModuleInit, IStorageService {
	private readonly logger = new Logger(S3Service.name);
	private minioClient: Minio.Client;
	private readonly bucketName: string;

	constructor(private readonly configService: ConfigService) {
		this.minioClient = new Minio.Client({
			endPoint: this.configService.get<string>("S3_ENDPOINT", "localhost"),
			port: Number.parseInt(this.configService.get<string>("S3_PORT", "9000"), 10),
			useSSL: this.configService.get<string>("S3_USE_SSL") === "true",
			accessKey: this.configService.get<string>("S3_ACCESS_KEY", "minioadmin"),
			secretKey: this.configService.get<string>("S3_SECRET_KEY", "minioadmin"),
		});
		this.bucketName = this.configService.get<string>(
			"S3_BUCKET_NAME",
			"memegoat",
		);
	}

	async onModuleInit() {
		await this.ensureBucketExists(this.bucketName);
	}

	async ensureBucketExists(bucketName: string) {
		try {
			const exists = await this.minioClient.bucketExists(bucketName);
			if (!exists) {
				await this.minioClient.makeBucket(bucketName);
				this.logger.log(`Bucket "${bucketName}" created successfully.`);
			}
		} catch (error) {
			this.logger.error(
				`Error checking/creating bucket "${bucketName}": ${error.message}`,
			);
			throw error;
		}
	}

	async uploadFile(
		fileName: string,
		file: Buffer,
		mimeType: string,
		metaData: Minio.ItemBucketMetadata = {},
		bucketName: string = this.bucketName,
	) {
		try {
			await this.minioClient.putObject(bucketName, fileName, file, file.length, {
				...metaData,
				"Content-Type": mimeType,
			});
			return fileName;
		} catch (error) {
			this.logger.error(`Error uploading file to ${bucketName}: ${error.message}`);
			throw error;
		}
	}

	async getFile(fileName: string, bucketName: string = this.bucketName) {
		try {
			return await this.minioClient.getObject(bucketName, fileName);
		} catch (error) {
			this.logger.error(`Error getting file from ${bucketName}: ${error.message}`);
			throw error;
		}
	}

	async getFileUrl(
		fileName: string,
		expiry = 3600,
		bucketName: string = this.bucketName,
	) {
		try {
			return await this.minioClient.presignedUrl(
				"GET",
				bucketName,
				fileName,
				expiry,
			);
		} catch (error) {
			this.logger.error(
				`Error getting file URL from ${bucketName}: ${error.message}`,
			);
			throw error;
		}
	}

	async getUploadUrl(
		fileName: string,
		expiry = 3600,
		bucketName: string = this.bucketName,
	) {
		try {
			return await this.minioClient.presignedUrl(
				"PUT",
				bucketName,
				fileName,
				expiry,
			);
		} catch (error) {
			this.logger.error(
				`Error getting upload URL for ${bucketName}: ${error.message}`,
			);
			throw error;
		}
	}

	async deleteFile(fileName: string, bucketName: string = this.bucketName) {
		try {
			await this.minioClient.removeObject(bucketName, fileName);
		} catch (error) {
			this.logger.error(
				`Error deleting file from ${bucketName}: ${error.message}`,
			);
			throw error;
		}
	}

	async getFileInfo(fileName: string, bucketName: string = this.bucketName) {
		try {
			return await this.minioClient.statObject(bucketName, fileName);
		} catch (error) {
			this.logger.error(
				`Error getting file info from ${bucketName}: ${error.message}`,
			);
			throw error;
		}
	}

	async moveFile(
		sourceFileName: string,
		destinationFileName: string,
		sourceBucketName: string = this.bucketName,
		destinationBucketName: string = this.bucketName,
	) {
		try {
			const conds = new Minio.CopyConditions();
			await this.minioClient.copyObject(
				destinationBucketName,
				destinationFileName,
				`/${sourceBucketName}/${sourceFileName}`,
				conds,
			);
			await this.minioClient.removeObject(sourceBucketName, sourceFileName);
			return destinationFileName;
		} catch (error) {
			this.logger.error(
				`Error moving file from ${sourceBucketName}/${sourceFileName} to ${destinationBucketName}/${destinationFileName}: ${error.message}`,
			);
			throw error;
		}
	}
}