import {
	NodeOAuthClient,
	NodeSavedSession,
	NodeSavedState
} from "@atproto/oauth-client-node";

const APP_URL = process.env.NEXT_PUBLIC_APP_URL;

if (!APP_URL) {
	throw new Error(
		"NEXT_PUBLIC_APP_URL is not set. This is required for OAuth configuration."
	);
}

const sessionStore = new Map<string, NodeSavedSession>();
const stateStore = new Map<string, NodeSavedState>();

export const atprotoClient = new NodeOAuthClient({
	clientMetadata: {
		application_type: "web",
		client_id: `${APP_URL}/api/auth/atproto/client-metadata.json`,
		client_name: "scrobbleToBio",
		dpop_bound_access_tokens: true,
		grant_types: ["authorization_code", "refresh_token"],
		redirect_uris: [`${APP_URL}/api/auth/atproto/callback`],
		response_types: ["code"],
		scope: "atproto transition:generic",
		token_endpoint_auth_method: "none"
	},
	handleResolver:
		"https://bsky.social/xrpc/com.atproto.identity.resolveHandle",
	sessionStore: {
		async del(sub: string): Promise<void> {
			sessionStore.delete(sub);
		},
		async get(sub: string): Promise<NodeSavedSession | undefined> {
			return sessionStore.get(sub);
		},
		async set(sub: string, session: NodeSavedSession): Promise<void> {
			sessionStore.set(sub, session);
		}
	},
	stateStore: {
		async del(key: string): Promise<void> {
			stateStore.delete(key);
		},
		async get(key: string): Promise<NodeSavedState | undefined> {
			return stateStore.get(key);
		},
		async set(key: string, internalState: NodeSavedState): Promise<void> {
			stateStore.set(key, internalState);
		}
	}
});