// ==UserScript==
// @name        Smaller gerritbot comments
// @version     5
// @description Changes gerritbot comments into one-liners.
// @match       https://phabricator.wikimedia.org/*
// @grant       none
// ==/UserScript==

const majorEvents = document.querySelectorAll(".phui-timeline-major-event");
const uselessMessage = "Your browser timezone setting differs from the timezone setting in your profile, click to reconcile.";
const gitlabUrl = "https://gitlab.wikimedia.org/repos/"


function getCleanTitle(me) {
  // Remove the text node: "added a comment."
  title = me.querySelector(".phui-timeline-title")
  title.childNodes.forEach(n => {
    if (n.nodeType == 3) {
      n.remove()
    }
  });
  return title
}


function handleGerritbot(me) {
  content = me.querySelectorAll(".phabricator-remarkup p")
  if (content[0].textContent.includes(gitlabUrl)) {
    // gerritbot seems to have handled gitlab changes in the past
    return handleCodeReviewBot(me)
  } else {
    // Comments from gerrit changes
    lastIDX = content.length - 1
    link = content[lastIDX].children[0]
    text = []
    content.forEach(function(e, i){
      if (i < lastIDX) {
        text = text.concat(e.textContent.split('\n'))
      }
    })
    textContent = text[0].trim()
    textTooltip = text[1].trim()

    changeId = textContent.match(/^Change #?(\d+)/)[1]
    newText = textContent.replace(/^Change #?\d+ (.*):$/, '$1')
    link.text = changeId
    // Add repo name and commit message as title for the changeId link
    link.setAttribute('title', textTooltip)

    title = getCleanTitle(me)
    title.append(": Change ", link, " ", newText)
    return true
  }
}

function handleCodeReviewBot(me) {
  content = me.querySelectorAll(".phabricator-remarkup p")

  // Comments from gitlab changes
  link = content[0].querySelector(".remarkup-link")
  actionLine = content[0].textContent.replace(link.href, "").trim().split(" ")
  action = actionLine.pop()
  user = actionLine.join(" ")

  // Remove the gitlab base URL from link rext
  link.text = link.href.replace(gitlabUrl, "")
  // Add the commit message as title for the link
  link.setAttribute('title', content[1].textContent)

  title = getCleanTitle(me)
  title.append(": MR ", link, " ", action, " by ", user)

  return true
 }


function handleStashbot(me) {
  content = me.querySelector(".phabricator-remarkup p")
  
  salSpan = content.querySelector("span")
  ircChannel = salSpan.textContent.match(/.*\((#\S+)\)/)[1]
  salURL = salSpan.querySelector("a").href
  salSpan.remove()
  
  salLink = document.createElement("a")
  salLink.setAttribute("href", salURL)
  salLink.setAttribute("target", "_blank")
  salLink.text = ircChannel
  
  title = getCleanTitle(me)
  title.append(" ", salLink, ": ")
  
  // remove the timestamp from text node
  content.childNodes.forEach(n => {
    if (n.nodeType == 3) {
      n.textContent = n.textContent.trimLeft().replace(/\[[\d-TZ:]+\] /, '')
    }
  })
  title.append(...content.childNodes)
  
  return true
}

// Remove irrelevant stuff from page title
// ⚓ T307943 
document.title = document.title.replace(/⚓ T\d+ /, "");


majorEvents.forEach(me => {
  modified = false
  
  if (me.querySelector(".phui-handle").text == 'gerritbot') {
    modified = handleGerritbot(me)
  }
  
  if (me.querySelector(".phui-handle").text == 'Stashbot') {
    modified = handleStashbot(me)
  }

  if (me.querySelector(".phui-handle").text == 'CodeReviewBot') {
    modified = handleCodeReviewBot(me)
  }
  
  if (modified) {
    // remove the "quote" menu on the right
    me.querySelector(".phui-timeline-menu").remove()
    // remove the original comment content
    me.querySelector(".phui-timeline-core-content").remove()
    // make this event minor (one-liner)
    me.classList.replace("phui-timeline-major-event", "phui-timeline-minor-event")
  }
});