import { randomBytes } from "node:crypto";
import { Injectable, Logger } from "@nestjs/common";
import { HashingService } from "../crypto/services/hashing.service";
import { ApiKeysRepository } from "./repositories/api-keys.repository";

@Injectable()
export class ApiKeysService {
	private readonly logger = new Logger(ApiKeysService.name);

	constructor(
		private readonly apiKeysRepository: ApiKeysRepository,
		private readonly hashingService: HashingService,
	) {}

	async create(userId: string, name: string, expiresAt?: Date) {
		this.logger.log(`Creating API key for user ${userId}: ${name}`);
		const prefix = "mg_live_";
		const randomPart = randomBytes(24).toString("hex");
		const key = `${prefix}${randomPart}`;

		const keyHash = await this.hashingService.hashSha256(key);

		await this.apiKeysRepository.create({
			userId,
			name,
			prefix: prefix.substring(0, 8),
			keyHash,
			expiresAt,
		});

		return {
			name,
			key, // Retourné une seule fois à la création
			expiresAt,
		};
	}

	async findAll(userId: string) {
		return await this.apiKeysRepository.findAll(userId);
	}

	async revoke(userId: string, keyId: string) {
		this.logger.log(`Revoking API key ${keyId} for user ${userId}`);
		return await this.apiKeysRepository.revoke(userId, keyId);
	}

	async validateKey(key: string) {
		const keyHash = await this.hashingService.hashSha256(key);

		const apiKey = await this.apiKeysRepository.findActiveByKeyHash(keyHash);

		if (!apiKey) return null;

		if (apiKey.expiresAt && apiKey.expiresAt < new Date()) {
			return null;
		}

		// Update last used at
		await this.apiKeysRepository.updateLastUsed(apiKey.id);

		return apiKey;
	}
}