// ==UserScript==
// @name        GitHub-Maintainer-Buttons
// @namespace   https://pruetz.net/userscript/github/maintainer-buttons
// @include     https://github.com/*/pull/*
// @version     1
// @grant       none
// @description Adds four Buttons To each Commit in a GitHub pull request for selecting comment templates.
// @downloadURL none
// ==/UserScript==

var commit_id = function (element) {
  return $(element).contents()[0].data;
};

var new_comment_field = $('#new_comment_field');

var fill_and_focus_comment = function(text) {
  new_comment_field.val(text);
  new_comment_field.focus();
};

var provide_feedback = function(commit_id) {
  fill_and_focus_comment("FEEDBACK (" + commit_id + ")\n\n* [ ] ");  
};

var request_review = function(commit_id) {
  fill_and_focus_comment("REVIEW (" + commit_id + ")\n\n[Cruise]() (" + commit_id + ")");
};

var say_its_ok = function(commit_id) {
  fill_and_focus_comment("OK (" + commit_id + ")");
};

var say_it_looks_good = function(commit_id) {
  fill_and_focus_comment("LGTM (" + commit_id + ")");
};

var add_button = function(dom_sibling, title, icon, click_handler) {
  // octicon class in conjunction with dark user stlye utterly destroys button style
  $("<button class='btn btn-sm octicon-" + icon + "' style='font: 16px/1 octicons; margin-left: 1px; margin-right: 1px;' title='" + title + "'></button>").
      appendTo($(dom_sibling.parentNode)).click(click_handler);
};

var add_maintainer_buttons = function () {
  var commit_id_elements = $('.commit-id');
  $.each(commit_id_elements, function(index, dom_element) {
    add_button(dom_element, "Feedback", "comment", function() { provide_feedback(commit_id(dom_element)); });
    add_button(dom_element, "Review", "eye", function() { request_review(commit_id(dom_element)); });
    add_button(dom_element, "Ok", "check", function() { say_its_ok(commit_id(dom_element)); });
    add_button(dom_element, "Seems fine", "thumbsup", function() { say_it_looks_good(commit_id(dom_element)); });
  });
};

add_maintainer_buttons();