/* vim: set ts=2 et sw=2 tw=80: */
/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";

// Test that autocompletion works as expected.

const TESTCASE_URI = TEST_BASE_HTTP + "autocomplete.html";
const MAX_SUGGESTIONS = 15;

const {getClientCssProperties} = require("devtools/shared/fronts/css-properties");
const {CSSProperties, CSSValues} = getCSSKeywords();

// Test cases to test that autocompletion works correctly when enabled.
// Format:
// [
//   key,
//   {
//     total: Number of suggestions in the popup (-1 if popup is closed),
//     current: Index of selected suggestion,
//     inserted: 1 to check whether the selected suggestion is inserted into the
//               editor or not,
//     entered: 1 if the suggestion is inserted and finalized
//   }
// ]
var TEST_CASES = [
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["Ctrl+Space", {total: 1, current: 0}],
  ["VK_LEFT"],
  ["VK_RIGHT"],
  ["VK_DOWN"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["Ctrl+Space", { total: getSuggestionNumberFor("font"), current: 0}],
  ["VK_END"],
  ["VK_RETURN"],
  ["b", {total: getSuggestionNumberFor("b"), current: 0}],
  ["a", {total: getSuggestionNumberFor("ba"), current: 0}],
  ["VK_DOWN", {total: getSuggestionNumberFor("ba"), current: 0, inserted: 1}],
  ["VK_TAB", {total: getSuggestionNumberFor("ba"), current: 1, inserted: 1}],
  ["VK_RETURN", {current: 1, inserted: 1, entered: 1}],
  ["b", {total: getSuggestionNumberFor("background", "b"), current: 0}],
  ["l", {total: getSuggestionNumberFor("background", "bl"), current: 0}],
  ["VK_TAB", {
    total: getSuggestionNumberFor("background", "bl"),
    current: 0, inserted: 1
  }],
  ["VK_DOWN", {
    total: getSuggestionNumberFor("background", "bl"),
    current: 1, inserted: 1
  }],
  ["VK_UP", {
    total: getSuggestionNumberFor("background", "bl"),
    current: 0,
    inserted: 1
  }],
  ["VK_TAB", {
    total: getSuggestionNumberFor("background", "bl"),
    current: 1,
    inserted: 1
  }],
  ["VK_TAB", {
    total: getSuggestionNumberFor("background", "bl"),
    current: 2,
    inserted: 1
  }],
  [";"],
  ["VK_RETURN"],
  ["c", {total: getSuggestionNumberFor("c"), current: 0}],
  ["o", {total: getSuggestionNumberFor("co"), current: 0}],
  ["VK_RETURN", {current: 0, inserted: 1}],
  ["r", {total: getSuggestionNumberFor("color", "r"), current: 0}],
  ["VK_RETURN", {current: 0, inserted: 1}],
  [";"],
  ["VK_LEFT"],
  ["VK_RIGHT"],
  ["VK_DOWN"],
  ["VK_RETURN"],
  ["b", {total: 2, current: 0}],
  ["u", {total: 1, current: 0}],
  ["VK_RETURN", {current: 0, inserted: 1}],
  ["{"],
  ["VK_HOME"],
  ["VK_DOWN"],
  ["VK_DOWN"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["VK_RIGHT"],
  ["Ctrl+Space", {total: 1, current: 0}],
];

add_task(function* () {
  let { panel, ui } = yield openStyleEditorForURL(TESTCASE_URI);

  yield ui.selectStyleSheet(ui.editors[1].styleSheet);
  let editor = yield ui.editors[1].getSourceEditor();

  let sourceEditor = editor.sourceEditor;
  let popup = sourceEditor.getAutocompletionPopup();

  yield SimpleTest.promiseFocus(panel.panelWindow);

  for (let index in TEST_CASES) {
    yield testState(index, sourceEditor, popup, panel.panelWindow);
    yield checkState(index, sourceEditor, popup);
  }
});

function testState(index, sourceEditor, popup, panelWindow) {
  let [key, details] = TEST_CASES[index];
  let entered;
  if (details) {
    entered = details.entered;
  }
  let mods = {};

  info("pressing key " + key + " to get result: " +
                JSON.stringify(TEST_CASES[index]) + " for index " + index);

  let evt = "after-suggest";

  if (key == "Ctrl+Space") {
    key = " ";
    mods.ctrlKey = true;
  } else if (key == "VK_RETURN" && entered) {
    evt = "popup-hidden";
  } else if (/(left|right|return|home|end)/ig.test(key) ||
           (key == "VK_DOWN" && !popup.isOpen)) {
    evt = "cursorActivity";
  } else if (key == "VK_TAB" || key == "VK_UP" || key == "VK_DOWN") {
    evt = "suggestion-entered";
  }

  let ready = sourceEditor.once(evt);
  EventUtils.synthesizeKey(key, mods, panelWindow);

  return ready;
}

function checkState(index, sourceEditor, popup) {
  let deferred = defer();
  executeSoon(() => {
    let [, details] = TEST_CASES[index];
    details = details || {};
    let {total, current, inserted} = details;

    if (total != undefined) {
      ok(popup.isOpen, "Popup is open for index " + index);
      is(total, popup.itemCount,
         "Correct total suggestions for index " + index);
      is(current, popup.selectedIndex,
         "Correct index is selected for index " + index);
      if (inserted) {
        let { text } = popup.getItemAtIndex(current);
        let { line, ch } = sourceEditor.getCursor();
        let lineText = sourceEditor.getText(line);
        is(lineText.substring(ch - text.length, ch), text,
           "Current suggestion from the popup is inserted into the editor.");
      }
    } else {
      ok(!popup.isOpen, "Popup is closed for index " + index);
      if (inserted) {
        let { text } = popup.getItemAtIndex(current);
        let { line, ch } = sourceEditor.getCursor();
        let lineText = sourceEditor.getText(line);
        is(lineText.substring(ch - text.length, ch), text,
           "Current suggestion from the popup is inserted into the editor.");
      }
    }
    deferred.resolve();
  });

  return deferred.promise;
}

/**
 * Returns a list of all property names and a map of property name vs possible
 * CSS values provided by the Gecko engine.
 *
 * @return {Object} An object with following properties:
 *         - CSSProperties {Array} Array of string containing all the possible
 *                         CSS property names.
 *         - CSSValues {Object|Map} A map where key is the property name and
 *                     value is an array of string containing all the possible
 *                     CSS values the property can have.
 */
function getCSSKeywords() {
  let cssProperties = getClientCssProperties();
  let props = {};
  let propNames = cssProperties.getNames();
  propNames.forEach(prop => {
    props[prop] = cssProperties.getValues(prop).sort();
  });
  return {
    CSSValues: props,
    CSSProperties: propNames.sort()
  };
}

/**
 * Returns the number of expected suggestions for the given property and value.
 * If the value is not null, returns the number of values starting with `value`.
 * Returns the number of properties starting with `property` otherwise.
 */
function getSuggestionNumberFor(property, value) {
  if (value == null) {
    return CSSProperties.filter(prop => prop.startsWith(property))
                        .slice(0, MAX_SUGGESTIONS).length;
  }
  return CSSValues[property].filter(val => val.startsWith(value))
                            .slice(0, MAX_SUGGESTIONS).length;
}
