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/*
* Copyright (c) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
var connect = function(socket) {
var _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, "${ mar[1] }". The system might be in an inconsistent state.`)
break
case "HI":
document.querySelectorAll(".need-connection").forEach(c => {
c.style.display = "block"
})
document.querySelectorAll(".before-connection").forEach(c => {
c.style.display = "none"
})
break
case "U": /* unauthenticated */
/* TODO: replace this with a box on screen */
alert("Your session is broken or has expired. You are unauthenticated and the server will reject your commands.")
break
case "N":
document.getElementById(`selected${ mar[1] }`).textContent = mar[2]
if (mar[2] === document.getElementById(`max${ mar[1] }`).textContent && !(document.getElementById(`tick${ mar[1] }`).checked)) {
document.getElementById(`tick${ mar[1] }`).disabled = true
} else {
document.getElementById(`tick${ 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
default:
alert(`Invalid command ${ mar[0] } received from socket. Something is wrong.`)
}
}
socket.addEventListener("message", _handleMessage)
var _handleClose = _event => {
document.querySelectorAll(".need-connection").forEach(c => {
c.style.display = "none"
})
document.querySelectorAll(".broken-connection").forEach(c => {
c.style.display = "block"
})
}
socket.addEventListener("close", _handleClose)
socket.send("HELLO")
}
const socket = new WebSocket("ws://localhost:5555/ws")
socket.addEventListener("open", function() {
connect(socket)
})
document.querySelectorAll(".coursecheckbox").forEach(c => {
c.addEventListener("input", () => {
if (c.id.slice(0, 4) !== "tick") {
alert(`${ c.id } is not in the correct format.`)
return false
}
switch (c.checked) {
case true:
c.indeterminate = true
socket.send(`Y ${ c.id.slice(4) }`)
break
case false:
c.indeterminate = false
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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