import { authenticateWithGoogle } from '$lib/google/auth/client.js';

export interface GoogleAuthState {
	isConnected: boolean;
	checking: boolean;
	connecting: boolean;
	showCancelOption: boolean;
	token: string | null;
	error: string | null;
	userEmail: string | null;
}

export function createGoogleAuthState(): GoogleAuthState {
	return {
		isConnected: false,
		checking: false,
		connecting: false,
		showCancelOption: false,
		token: null,
		error: null,
		userEmail: null
	};
}

export class GoogleAuthManager {
	private readonly state: GoogleAuthState;
	private cancelTimeout: ReturnType<typeof setTimeout> | null = null;

	constructor(state: GoogleAuthState) {
		this.state = state;
	}

	checkConnection(): void {
		this.state.checking = true;
		this.state.error = null;

		try {
			const token = localStorage.getItem('google_refresh_token');
			const email = localStorage.getItem('google_user_email');

			this.state.isConnected = !!token;
			this.state.token = token;
			this.state.userEmail = email;
		} catch (error) {
			console.error('Error checking connection:', error);
			this.state.error = 'Failed to check connection status';
		} finally {
			this.state.checking = false;
		}
	}

	async connectToGoogle(): Promise<void> {
		if (this.state.connecting) return;

		this.state.connecting = true;
		this.state.error = null;
		this.state.showCancelOption = false;

		// Show cancel option after 5 seconds
		this.cancelTimeout = setTimeout(() => {
			this.state.showCancelOption = true;
		}, 5000);

		try {
			const result = await authenticateWithGoogle();

			if (result.success && result.refreshToken) {
				// Store tokens
				localStorage.setItem('google_refresh_token', result.refreshToken);
				if (result.userEmail) {
					localStorage.setItem('google_user_email', result.userEmail);
				}

				// Update state
				this.state.isConnected = true;
				this.state.token = result.refreshToken;
				this.state.userEmail = result.userEmail;
			} else {
				throw new Error(result.error ?? 'Authentication failed');
			}
		} catch (error) {
			this.state.error = error instanceof Error ? error.message : 'Failed to connect to Google';
		} finally {
			this.state.connecting = false;
			this.state.showCancelOption = false;
			if (this.cancelTimeout) {
				clearTimeout(this.cancelTimeout);
				this.cancelTimeout = null;
			}
		}
	}

	cancelGoogleAuth(): void {
		this.state.connecting = false;
		this.state.showCancelOption = false;
		this.state.error = null;

		if (this.cancelTimeout) {
			clearTimeout(this.cancelTimeout);
			this.cancelTimeout = null;
		}
	}

	async disconnectGoogle(): Promise<void> {
		try {
			// Clear local storage
			localStorage.removeItem('google_refresh_token');
			localStorage.removeItem('google_user_email');

			// Reset state
			this.state.isConnected = false;
			this.state.token = null;
			this.state.userEmail = null;
			this.state.error = null;
		} catch (error) {
			console.error('Error disconnecting:', error);
			this.state.error = 'Failed to disconnect';
		}
	}
}