"use strict";

function createClient(endpoint) {
	const api = new mm_client.MattermostApi(normalizedEndpoint(endpoint));
	return new mm_client.MattermostClient(api);
}

function buttonDisable(element, text) {
	if (!element.dataset.originalText) {
		element.dataset.originalText = element.innerText;
	}
	element.innerText = text;
	element.disabled = true;
}
function buttonEnable(element) {
	element.innerText = element.dataset.originalText;
	element.disabled = false;
}

function logIn() {
	const client = createClient(byId("login_server").value);

	buttonDisable(byId("login_button"), "Logging in...");

	client.logIn(byId("login_login_id").value, byId("login_password").value)
		.then(json => {
			buttonEnable(byId("login_button"));
			byId("login_message").innerText = "";
			byId("channel_list").innerText = `Logged in as ${json.username}`;
			window.location = "#";
			populateServerSelectionList();
			populateChannelList();
		})
		.catch(error => {
			console.error(error);
			buttonEnable(byId("login_button"));
			byId("login_message").innerText = `${error}`;
		});
}

function logOut(endpoint, button) {
	const client = createClient(endpoint);

	buttonDisable(button, "Logging out...");

	client.logOut()
		.then(response => {
			console.info("Succesfully logged out");
			populateServerSelectionList();
			populateChannelList();
		})
		.catch(error => {
			console.error(error);
			const span = document.createElement("span");
			span.innerText = `Failed to log out: ${error.message}`;
			button.parentElement.appendChild(span);
			buttonEnable(button);
		});
}

function channelNameElements(team, channel) {
	let icon = "";
	let teamName = team.name;
	let channelName = channel.name;
	let title = "";

	switch (channel.type) {
		case "O": // Public channel
			title = `${channel.name} in team ${team.name} (public)`;
			break;
		case "P": // Private channel
			icon = "🔒";
			title = `${channel.name} in team ${team.name} (private)`;
			break;
		case "D": // Direct message
			return undefined;
			teamName = "";
			channelName = `👤 ...`;
			title = `Direct message`;
			break;
		case "G": // Group chat
			teamName = "";
			channelName = `👥 ${channel.display_name}`;
			title = `Group chat with ${channel.display_name}`;
			break;
		default: // Unsupported
			icon = channel.type;
			title = `${channel.name} in team ${team.name} (type ${channel.type})`;
			break;
	}

	let elements = [];

	if (icon) {
		elements.push(`${icon} `);
	}

	if (teamName) {
		const teamElement = document.createElement("span");
		teamElement.className = "team-name";
		teamElement.innerText = teamName;
		elements.push(teamElement);

		const separatorElement = document.createElement("span");
		separatorElement.className = "separator";
		separatorElement.innerText = "/";
		elements.push(separatorElement);
	}

	const channelElement = document.createElement("span");
	channelElement.className = "channel-name";
	channelElement.innerText = channelName;
	elements.push(channelElement);

	return [title, elements];
}

function switchToChannel(client, team, channel) {
	for (let el of byId("channel_list").childNodes) {
		if (el.dataset["id"] == channel.id) {
			el.className = "active";
		} else {
			el.className = "";
		}
	}

	byId("channel_contents").innerText = "Loading…";
	client.channelPosts(channel.id)
		.then(response => {
			console.info(`Got channel contents of ${channel.id} (${channel.name})`);
			populateChannelContents(response);
		})
		.catch(error => {
			console.error(error);
			byId("channel_contents").innerText = `Failed to get channel contents:\n${error.message}`;
		});

	const [title, elements] = channelNameElements(team, channel);
	byId("channel_header").innerHTML = "";
	byId("channel_header").append(...elements);
	byId("compose").setAttribute("placeholder", `Write to ${byId("channel_header").textContent}`);
}