import type { Activity, ActivityTemplate, ActivityType, Sykkelaksjon } from './message';
import type { SykkelaksjonOpenid } from './openid';
import './style.css'
import Alpine from 'alpinejs'
import * as openidClient from 'openid-client';

// ---------------- HTML ELEMENT SETUP ----------------
// Set the default date to today
let datepicker = document.getElementById("activity-date") as HTMLInputElement;
datepicker.valueAsDate = new Date();


// Override what the activity form does
let activityForm = document.getElementById("activity-form") as HTMLFormElement;
activityForm.onsubmit = () => false;

// Override what the activity button does
document.getElementById("submit-activity-button")?.addEventListener("click", () => submitFormToUrl(apiUrl + "/submitActivity"));
document.getElementById("submit-activity-template-button")?.addEventListener("click", () => submitFormToUrl(apiUrl + "/submitActivityTemplate"));

let loadingDiv = document.getElementById("loading-div");
let contentDiv = document.getElementById("content-div");

// ---------------- ALPINE STATE -----------------------
interface AlpineState {
	data: Sykkelaksjon,
	registerTemplateActivity: (template: ActivityTemplate) => void,
	deleteTemplateActivity: (template: ActivityTemplate) => void,
	deleteActivity: (activity: Activity) => void,
	deleteActivityType: (activityType: ActivityType) => void,

	makeAdministrator: (userId: number) => void,
	removeAdministrator: (userId: number) => void,
	deleteUser: (userId: number) => void,

	onClickHideCheckbox: (event: PointerEvent) => void,

	init: () => void,
	setServerMessage: (newMessage: Sykkelaksjon) => void,
	getServerMessage: () => Sykkelaksjon,
};

let defaultData: Sykkelaksjon = {
	name: "ukjent bruker",
	isAdmin: false,
	unitConversionNecessary: false,
	activityTypes: [],
	activityTemplates: [],
	activities: [],
	otherUsers: []
}

let alpineState: AlpineState = {
	data: defaultData,
	registerTemplateActivity: registerTemplateActivity,
	deleteTemplateActivity: deleteTemplateActivity,
	deleteActivity: deleteActivity,
	deleteActivityType: deleteActivityType,

	makeAdministrator: makeAdministrator,
	removeAdministrator: removeAdministrator,
	deleteUser: deleteUser,

	onClickHideCheckbox: onClickHideCheckbox,

	init() {
		this.data = defaultData;
	},
	setServerMessage(newMessage: Sykkelaksjon) {
		this.data = newMessage;
	},
	getServerMessage(): Sykkelaksjon {
		return this.data;
	}
}

window.Alpine = Alpine
Alpine.store('state', alpineState);
Alpine.start();


// ------------------- FUNCTIONS TO BE CALLED FROM THE HTML -----------------------
function registerTemplateActivity(template: ActivityTemplate): void {
	let form = new FormData();
	form.set("activity-type", template.activityType.id?.toString() ?? "");
	form.set("activity-description", template.name);
	form.set("activity-distance", template.numberOfUnits.toString());
	var currentDate = new Date();
	form.set("activity-date", `${currentDate.getFullYear().toString().padStart(4, '0')}-${(currentDate.getMonth()+1).toString().padStart(2, '0')}-${currentDate.getDate().toString().padStart(2, '0')}`);
	submitFormToUrl(apiUrl + "/submitActivity", form);
}

function deleteTemplateActivity(template: ActivityTemplate): void {
	let form = new FormData();
	form.set("activity-template-id", template.id?.toString() ?? "");
	submitFormToUrl(apiUrl + "/deleteActivityTemplate", form, "DELETE");
}

function deleteActivity(activity: Activity): void {
	let form = new FormData();
	form.set("activity-id", activity.id?.toString() ?? "");
	submitFormToUrl(apiUrl + "/deleteActivity", form, "DELETE");
}

function postActivityType(): void {
	let activityTypeForm = document.getElementById("activity-type-form") as HTMLFormElement;
	let activtyTypeData = new FormData(activityTypeForm);
	
	submitFormToUrl(apiUrl + "/addActivityType", activtyTypeData);
}

declare global {
	interface Window { postActivityType: () => void }
}
window.postActivityType = postActivityType;

function deleteActivityType(activityType: ActivityType) {
	let form = new FormData();
	form.set("activity-type-id", activityType.id?.toString() ?? "");
	submitFormToUrl(apiUrl + "/deleteActivityType", form, "DELETE");
}

function makeAdministrator(userId: number) {
	let form = new FormData();
	form.set("user-id", userId.toString());
	submitFormToUrl(apiUrl + "/makeAdmin", form, "PUT")
}

function removeAdministrator(userId: number) {
	let form = new FormData();
	form.set("user-id", userId.toString());
	submitFormToUrl(apiUrl + "/removeAdmin", form, "PUT")
}

function deleteUser(userId: number) {
	let form = new FormData();
	form.set("user-id", userId.toString());
	submitFormToUrl(apiUrl + "/deleteUser", form, "DELETE");
}

// ------------------- DECIDE WHERE TO CONNECT -------------
let apiUrl: string;

if (import.meta.env.DEV) {
	apiUrl = "http://localhost:8080/api";
} else {
	apiUrl = document.location.protocol + "//" + document.location.host + "/api";
}

// ------------------- OPENID CONNECT STUFF ----------------

let discoveryUri = localStorage.getItem("sykkelaksjon-discovery-uri");
let clientId = localStorage.getItem("sykkelaksjon-client-id");

if (!discoveryUri || !clientId) {
	await fetch(apiUrl + "/openid")
		.then(response => response.json())
		.then(json => {
			let received = json as SykkelaksjonOpenid;
			discoveryUri = received.openid_discovery_uri;
			clientId = received.client_id;

			localStorage.setItem("sykkelaksjon-discovery-uri", discoveryUri);
			localStorage.setItem("sykkelaksjon-client-id", clientId);
		})
}

let refreshToken: string | null = null;
let config: openidClient.Configuration | null = null;
if (discoveryUri && clientId) {
	let server: URL = new URL(discoveryUri);
	config = await openidClient.discovery(server, clientId);

	let getCurrentUrl: ((...args: any) => URL) = () => {
		return new URL(window.location.href);
	}

	let currentUrl = getCurrentUrl();
	let codeVerifier = localStorage.getItem("sykkelaksjon-codeverifier");

	if (!currentUrl.searchParams.has("session_state") || !currentUrl.searchParams.has("iss") || !currentUrl.searchParams.has("code") || !codeVerifier) {
		let redirectUri = window.location.href;
		let scope = "openid profile";

		codeVerifier = openidClient.randomPKCECodeVerifier();
		localStorage.setItem("sykkelaksjon-codeverifier", codeVerifier);
		let codeChallenge = await openidClient.calculatePKCECodeChallenge(codeVerifier);

		let state: string;

		let parameters: Record<string, string> = {
			redirect_uri: redirectUri,
			scope,
			code_challenge: codeChallenge,
			code_challenge_method: 'S256'
		};

		if (!config.serverMetadata().supportsPKCE()) {
			state = openidClient.randomState();
			parameters.state = state;
			localStorage.setItem("sykkelaksjon-state", state);
		}

		let redirectTo: URL = openidClient.buildAuthorizationUrl(config, parameters);
		window.location.href = redirectTo.toString();
	} else {
		window.history.pushState({}, "", window.location.protocol + "//" + window.location.host);
		let state = localStorage.getItem("sykkelaksjon-state");

		let authorizationData: Record<string, string> = {
			pkceCodeVerifier: codeVerifier
		};
		if (state) {
			authorizationData['state'] = state;
		}

		let tokens = await openidClient.authorizationCodeGrant(
			config,
			currentUrl,
			authorizationData
		);

		refreshToken = tokens.refresh_token ?? null;
	}
}

// ------------------- REQUESTING DATA FROM THE API -------------------------------
let receivedData = false;
const getAccessToken: () => Promise<string | null> = async () => {
	if (!refreshToken || !config) {
		return null;
	}
	let receivedTokens = await openidClient.refreshTokenGrant(config, refreshToken);
	refreshToken = receivedTokens.refresh_token ?? null;
	return receivedTokens.access_token;
}

const submitFormToUrl = (url: string, formData?: FormData, method?: string) => {
	if (!refreshToken) {
		return;
	}

	if (!formData) {
		formData = new FormData(activityForm);
	}

	if (!method) {
		method = 'POST';
	}

	getAccessToken().then(token => {
		if (token) {
			fetch(
				url,
				{
					method: method,
					body: formData,
					credentials: 'include',
					headers: {
						"Authorization": `Bearer ${token}`
					}
				}
			).then(() => refreshData(token));
		}
	});
	
}

const refreshData = async (accessToken?: string) => {
	if (!refreshToken) {
		return;
	}

	if (!accessToken) {
		let possibleAccessToken = await getAccessToken();
		if (!possibleAccessToken) {
			return;
		}

		accessToken = possibleAccessToken;
	}
	
	await fetch(apiUrl, {headers: {"Authorization": `Bearer ${accessToken}`}})
	.then(response => response.json())
	.then(message => {
		(Alpine.store('state') as AlpineState).setServerMessage(message)
		receivedData = true;
	});
}

// Finally, refresh data
await refreshData();
// After data is refreshed, display it
if (receivedData) {
	loadingDiv?.setAttribute("style", "display: none");
	contentDiv?.setAttribute("style", "display: block");
}

function onClickHideCheckbox(event: PointerEvent) {
	let possibleCheckbox = event.target;
	if (possibleCheckbox instanceof HTMLInputElement) {
		let formData = new FormData();
		let url;

		let isChecked = possibleCheckbox.checked;
		if (isChecked) {
			url = apiUrl + "/hideMe"
		} else {
			url = apiUrl + "/showMe"
		}

		submitFormToUrl(url, formData, "PUT");
	}
}