// ==UserScript==
// @name        nightly.link buttons
// @namespace   blankie-scripts
// @match       http*://github.com/*
// @grant       none
// @version     1.1
// @author      blankie
// @run-at      document-end
// @description Show buttons to nightly.link on artifacts and build logs
// ==/UserScript==

const INSTANCE_URL = "https://nightly.link";

function addArtifactsButton(artifactsDiv) {
    if (artifactsDiv === null) {
        return false;
    }

    let artifactsButton = document.createElement("a");
    artifactsButton.className = "btn";
    // https://stackoverflow.com/a/17228764
    artifactsButton.style.float = "right";
    artifactsButton.innerText = "View on nightly.link";
    artifactsButton.href = INSTANCE_URL + location.pathname;
    artifactsDiv.prepend(artifactsButton);

    return true;
}

function addLogsButton(githubLogsButton, logsHeader) {
    if (githubLogsButton !== null) {
        let nightlyLogsButton = document.createElement("a");
        nightlyLogsButton.className = "pl-5 dropdown-item btn-link";
        nightlyLogsButton.innerText = "View logs on nightly.link";
        nightlyLogsButton.href = INSTANCE_URL + location.pathname + ".txt";
        githubLogsButton.parentNode.append(nightlyLogsButton);
        return true;
    } else if (logsHeader !== null) {
        let logsLink = document.createElement("a");
        logsLink.innerText = "View on nightly.link";
        logsLink.href = INSTANCE_URL + location.pathname + ".txt";
        logsHeader.append(logsLink);
        return true;
    }
    return false;
}

function handleNewPage() {
    let artifactsDiv = document.body.querySelector("div#artifacts div.mx-0.mx-md-1");
    let githubLogsButton = document.body.querySelector("a.js-steps-dropdown-raw-logs");
    let logsHeader = document.body.querySelector("div.js-checks-log-toolbar");
    addArtifactsButton(artifactsDiv) || addLogsButton(githubLogsButton, logsHeader);
};
handleNewPage();

function observerCallback(mutationList, observer) {
    for (mutation of mutationList) {
        if (mutation.type !== "childList") {
            continue;
        }
        for (node of mutation.addedNodes) {
            if (node.nodeName === "BODY") {
                handleNewPage();
                return;
            }
        }
    }
}

let observer = new MutationObserver(observerCallback);
observer.observe(document.body.parentNode, {childList: true});