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/*
* Copyright (c) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
document.addEventListener("DOMContentLoaded", () => {
const socket = new WebSocket("wss://cca.runxiyu.org/ws")
/*
* TODO I want to make this easily configurable somehow, but I'm unsure
* how to fill things into JavaScript. A few possible solutions:
* - Replace this string during build time
* This is suboptimal because users should be able to replace it
* during runtime, as the binary is supposed to be decoupled from
* particular instances.
* - Replace this string while setting the static handler.
* This is a bit more involved because it requires messing with io.fs;
* I also don't know a way to cleanly escape it.
* - Indicate this string somewhere in the template (perhaps via
* a JavaScript variable that we could access).
* This is probably the way to go, especially since html/template
* provides contextual escaping.
*/
socket.addEventListener("open", function() {
let gstate = 0
let _handleMessage = event => {
let msg = new String(event?.data)
/*
* Standard IRC Message format parsing without IRCv3
* tags or prefixes. It's a simple enough protocol
* format suitable for our use-case. No need for
* protobuf or anything else nontrivial.
*/
let mar = msg.split(" ")
for (let i = 0; i < mar.length; i++) {
if (mar[i].startsWith(":")) {
if (i === mar.length - 1) {
mar[i] = mar[i].substring(1)
break
}
mar[i] = mar[i].substring(1) + " " +
mar.slice(i + 1).join(" ")
mar.splice(i + 1)
break
}
}
switch (mar[0]) {
case "E": /* unexpected error */
alert(`The server reported an unexpected error, "${ mar[1] }". The system might be in an inconsistent state.`)
break
case "HI":
document.querySelectorAll(".need-connection").
forEach(c => {
c.style.display = "block"
})
document.querySelectorAll(".before-connection").
forEach(c => {
c.style.display = "none"
})
if (mar[1] !== "") {
let courseIDs = mar[1].split(",")
for (let i = 0; i < courseIDs.length; i++) {
document.getElementById(
`tick${ courseIDs[i] }`
).checked = true
if (gstate === 1) {
document.getElementById(
`tick${ courseIDs[i] }`
).disabled = false
}
}
}
break
case "U": /* unauthenticated */
/* TODO: replace this with a box on screen */
alert("Your session is broken or has expired. You are unauthenticated and the server will reject your commands.")
break
case "N":
document.getElementById(`tick${ mar[1] }`).
checked = false
document.getElementById(`tick${ mar[1] }`).
indeterminate = false
break
case "M":
document.getElementById(`selected${ mar[1] }`).
textContent = mar[2]
if (
mar[2] === document.getElementById(`max${ mar[1] }`).textContent &&
!(document.getElementById(`tick${ mar[1] }`).checked)
) {
document.getElementById(`tick${ mar[1] }`).disabled = true
} else if (gstate === 1) {
document.getElementById(`tick${ mar[1] }`).disabled = false
}
break
case "R": /* course selection rejected */
document.getElementById(`coursestatus${ mar[1] }`).
textContent = mar[2]
document.getElementById(`coursestatus${ mar[1] }`).
style.color = "red"
document.getElementById(`tick${ mar[1] }`).
checked = false
document.getElementById(`tick${ mar[1] }`).
indeterminate = false
if (mar[2] === "Full") {
document.getElementById(`tick${ mar[1] }`).
disabled = true
}
break
case "Y": /* course selection approved */
document.getElementById(`coursestatus${ mar[1] }`).
textContent = ""
document.getElementById(`coursestatus${ mar[1] }`).
style.removeProperty("color")
document.getElementById(`tick${ mar[1] }`).
checked = true
document.getElementById(`tick${ mar[1] }`).
indeterminate = false
break
case "STOP":
gstate = 0
document.getElementById("stateindicator").textContent = "disabled"
document.getElementById("confirmbutton").disabled = true
document.querySelectorAll(".coursecheckbox").forEach(c => {
c.disabled = true
})
break
case "START":
gstate = 1
document.querySelectorAll(".courseitem").forEach(c => {
if (c.querySelector(".selected-number").textContent !== c.querySelector(".max-number").textContent || c.querySelector(".coursecheckbox").checked) {
c.querySelector(".coursecheckbox").disabled = false
}
})
document.getElementById("confirmbutton").disabled = false
document.getElementById("stateindicator").textContent = "enabled"
break
default:
alert(`Invalid command ${ mar[0] } received from socket. Something is wrong.`)
}
}
socket.addEventListener("message", _handleMessage)
let _handleClose = _event => {
document.querySelectorAll(".need-connection").forEach(c => {
c.style.display = "none"
})
document.querySelectorAll(".broken-connection").
forEach(c => {
c.style.display = "block"
})
}
socket.addEventListener("close", _handleClose)
socket.send("HELLO")
})
document.querySelectorAll(".coursecheckbox").forEach(c => {
c.addEventListener("input", () => {
if (c.id.slice(0, 4) !== "tick") {
alert(`${ c.id } is not in the correct format.`)
return false
}
switch (c.checked) {
case true:
c.indeterminate = true
document.querySelectorAll(".coursecheckbox").forEach(d => {
if (d.checked === true && d.dataset.group === c.dataset.group && c.id !== d.id) {
d.indeterminate = true
socket.send(`N ${ d.id.slice(4) }`)
}
})
socket.send(`Y ${ c.id.slice(4) }`)
break
case false:
c.indeterminate = true
socket.send(`N ${ c.id.slice(4) }`)
break
default:
alert(`${ c.id }'s "checked" attribute is ${ c.checked } which is invalid.`)
}
return false
})
})
document.getElementById("confirmbutton").addEventListener("click", () => {
socket.send("C")
})
document.querySelectorAll(".script-required").forEach(c => {
c.style.display = "block"
})
document.querySelectorAll(".script-unavailable").forEach(c => {
c.style.display = "none"
})
})
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