"use strict";

import Mousetrap from "mousetrap";

const $ = require("jquery");
import store from "./store";
import {switchToChannel} from "./router";

// Switch to the next/previous window in the channel list.
Mousetrap.bind(["alt+up", "alt+down"], function(e, keys) {
	const sidebar = $("#sidebar");
	const channels = sidebar.find(".chan").not(".network.collapsed :not(.lobby)");
	const index = channels.index(channels.filter(".active"));
	const direction = keys.split("+").pop();
	let target;

	switch (direction) {
		case "up":
			target = (channels.length + (index - 1 + channels.length)) % channels.length;
			break;

		case "down":
			target = (channels.length + (index + 1 + channels.length)) % channels.length;
			break;
	}

	target = channels.eq(target).click();
	scrollIntoViewNicely(target[0]);

	return false;
});

// Switch to the next/previous lobby in the channel list
Mousetrap.bind(["alt+shift+up", "alt+shift+down"], function(e, keys) {
	const sidebar = $("#sidebar");
	const lobbies = sidebar.find(".lobby");
	const direction = keys.split("+").pop();
	let index = lobbies.index(lobbies.filter(".active"));
	let target;

	switch (direction) {
		case "up":
			if (index < 0) {
				target = lobbies.index(
					sidebar
						.find(".channel")
						.filter(".active")
						.siblings(".lobby")[0]
				);
			} else {
				target = (lobbies.length + (index - 1 + lobbies.length)) % lobbies.length;
			}

			break;

		case "down":
			if (index < 0) {
				index = lobbies.index(
					sidebar
						.find(".channel")
						.filter(".active")
						.siblings(".lobby")[0]
				);
			}

			target = (lobbies.length + (index + 1 + lobbies.length)) % lobbies.length;

			break;
	}

	target = lobbies.eq(target).click();
	scrollIntoViewNicely(target[0]);

	return false;
});

// Jump to the first window with a highlight in it, or the first with unread
// activity if there are none with highlights.
Mousetrap.bind(["alt+a"], function() {
	let targetchan;

	outer_loop: for (const network of store.state.networks) {
		for (const chan of network.channels) {
			if (chan.highlight) {
				targetchan = chan;
				break outer_loop;
			}

			if (chan.unread && !targetchan) {
				targetchan = chan;
			}
		}
	}

	if (targetchan) {
		switchToChannel(targetchan);
	}

	return false;
});

// Ignored keys which should not automatically focus the input bar
const ignoredKeys = {
	8: true, // Backspace
	9: true, // Tab
	12: true, // Clear
	16: true, // Shift
	17: true, // Control
	18: true, // Alt
	19: true, // Pause
	20: true, // CapsLock
	27: true, // Escape
	35: true, // End
	36: true, // Home
	37: true, // ArrowLeft
	38: true, // ArrowUp
	39: true, // ArrowRight
	40: true, // ArrowDown
	45: true, // Insert
	46: true, // Delete
	112: true, // F1
	113: true, // F2
	114: true, // F3
	115: true, // F4
	116: true, // F5
	117: true, // F6
	118: true, // F7
	119: true, // F8
	120: true, // F9
	121: true, // F10
	122: true, // F11
	123: true, // F12
	144: true, // NumLock
	145: true, // ScrollLock
	224: true, // Meta
};

document.addEventListener("keydown", (e) => {
	// Ignore any key that uses alt modifier
	// Ignore keys defined above
	if (e.altKey || ignoredKeys[e.which]) {
		return;
	}

	// Ignore all ctrl keys except for ctrl+v to allow pasting
	if ((e.ctrlKey || e.metaKey) && e.which !== 86) {
		return;
	}

	// Redirect pagedown/pageup keys to messages container so it scrolls
	if (e.which === 33 || e.which === 34) {
		const chat = document.querySelector("#windows .chan.active .chat");

		if (chat) {
			chat.focus();
		}

		return;
	}

	const tagName = e.target.tagName;

	// Ignore if we're already typing into <input> or <textarea>
	if (tagName === "INPUT" || tagName === "TEXTAREA") {
		return;
	}

	const input = document.getElementById("input");

	if (!input) {
		return;
	}

	input.focus();

	// On enter, focus the input but do not propagate the event
	// This way, a new line is not inserted
	if (e.which === 13) {
		e.preventDefault();
	}
});

function scrollIntoViewNicely(el) {
	// Ideally this would use behavior: "smooth", but that does not consistently work in e.g. Chrome
	// https://github.com/iamdustan/smoothscroll/issues/28#issuecomment-364061459
	el.scrollIntoView({block: "center", inline: "nearest"});
}