// @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-3.0

if (localStorage.getItem("DONOTSHARE-secretkey") !== null || localStorage.getItem("DONOTSHARE-password") !== null) {
    window.location.replace("/app/")
    document.body.innerHTML = "Redirecting..."
    throw new Error();
}

let remote = localStorage.getItem("homeserverURL")
if (remote == null) {
    localStorage.setItem("homeserverURL", "https://notes.hectabit.org")
    remote = "https://notes.hectabit.org"
}

let usernameBox = document.getElementById("usernameBox")
let passwordBox = document.getElementById("passwordBox")
let statusBox = document.getElementById("statusBox")
let signupButton = document.getElementById("signupButton")
let opButton = document.getElementById("opButton")

// Leave these variables alone, they are used in the WASM code.

async function hashpass(pass) {
    return await hashwasm.argon2id({
        password: pass,
        salt: new TextEncoder().encode("I munch Burgers!!"),
        parallelism: 1,
        iterations: 32,
        memorySize: 19264,
        hashLength: 32,
        outputType: "hex"
    })
}

function showElements(yesorno) {
    if (!yesorno) {
        usernameBox.classList.add("hidden")
        passwordBox.classList.add("hidden")
        signupButton.classList.add("hidden")
        opButton.classList.add("hidden")
        inputContainer.classList.add("hidden")
    }
    else {
        usernameBox.classList.remove("hidden")
        passwordBox.classList.remove("hidden")
        signupButton.classList.remove("hidden")
        opButton.classList.remove("hidden")
        inputContainer.classList.remove("hidden")
    }
}

document.addEventListener("DOMContentLoaded", function() {
    document.getElementById("homeserver").innerText = "Your homeserver is: " + remote + ". "
});

opButton.addEventListener("click", () => {
    window.location.href = "/login"
});

complete = new Event("completed");
window.returnCode = undefined;
window.returnVar = undefined;

// This is for the WASM code to call when it's done. Do not remove it, even if it looks like it's never called.

function WASMComplete() {
    window.dispatchEvent(complete);
}

signupButton.addEventListener("click", () => {
        let username = usernameBox.value
        let password = passwordBox.value

        if (username === "") {
            statusBox.innerText = "Username required!"
            return
        }
        if ((username).length > 20) {
            statusBox.innerText = "Username cannot be more than 20 characters!"
            return
        }
        if (password === "") {
            statusBox.innerText = "Password required!"
            return
        }
        if ((password).length < 8) {
            statusBox.innerText = "Password must be at least 8 characters!"
            return
        }

        showElements(false)
        statusBox.innerText = "Computing PoW Challenge... (this may take up to 5 minutes at worst, 3 seconds at best)"

        /*
         * Compiled version of:
         * hashcat-wasm (https://concord.hectabit.org/hectabit/hashcat-wasm)
         * (c) Arzumify
         * @license AGPL-3.0
         * Since this is my software, if you use it with proprietary servers, I will make sure you will walk across hot coals (just kidding, probably).
         * I'm not kidding about the license though.
         * I should stop including comments into JS and possibly minify this code. Oh, well.
        */

        const go = new Go();
        WebAssembly.instantiateStreaming(fetch("/static/wasm/hashcat.wasm"), go.importObject).then((result) => {
            go.run(result.instance);
        })

        window.addEventListener("completed", async () => {
            if (window.returnCode === 1) {
                statusBox.innerText = "Please do not expose your computer to cosmic rays (an impossible logical event has occurred)."
                showElements(true)
                return
            } else if (window.returnCode === 2) {
                statusBox.innerText = "The PoW Challenge has failed. Please try again."
                showElements(true)
                return
            }

            statusBox.innerText = "Hashing password..."
            let hashedPassword = await hashpass(password)
            statusBox.innerText = "Contacting server..."
            fetch(remote + "/api/signup", {
                method: "POST",
                body: JSON.stringify({
                    username: username,
                    password: hashedPassword,
                    stamp: window.returnVar,
                }),
                headers: {
                    "Content-Type": "application/json; charset=UTF-8",
                }
            })
                .then((response) => response)
                .then(async (response) => {
                    let responseData = await response.json()

                    if (response.status === 200) {
                        statusBox.innerText = "Setting up encryption keys..."
                        localStorage.setItem("DONOTSHARE-secretkey", responseData["key"])
                        localStorage.setItem("DONOTSHARE-password", await hashwasm.argon2id({
                            password: password,
                            salt: new TextEncoder().encode("I love Burgernotes!"),
                            parallelism: 1,
                            iterations: 32,
                            memorySize: 19264,
                            hashLength: 32,
                            outputType: "hex"
                        }))
                        statusBox.innerText = "Welcome!"
                        await new Promise(r => setTimeout(r, 200))
                        window.location.href = "/app/"
                    } else if (response.status === 409) {
                        statusBox.innerText = "Username already taken!"
                        showElements(true)
                    } else if (response.status === 429) {
                        statusBox.innerText = "Please don't sign up to new accounts that quickly. If you are using a VPN, please turn it off!"
                        showElements(true)
                    } else if (response.status === 409) {
                        statusBox.innerText = "Pure bad luck... your PoW challenge was accepted, but someone else used the same PoW challenge as you. Please try again. (error: " + responseData["error"] + ")"
                        showElements(true)
                    } else if (response.status === 500) {
                        statusBox.innerText = responseData["error"]
                        showElements(true)
                    } else {
                        statusBox.innerText = "Something went wrong! (error: " + responseData["error"] + ")"
                        showElements(true)
                    }
                })
        })
});

// @license-end