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pants = {
  // Functions to manipulate a 'collapsible' - a div that can be expanded or collapsed.
  collapsible: {
    toggle: function(id) {
      $("#" + id + "-content").toggle();
      $("#" + id + "-icon").toggleClass("icon-caret-right icon-caret-down")
    },

    expand: function(id) {
      $("#" + id + "-content").show();
      $("#" + id + "-icon").removeClass("icon-caret-right").addClass("icon-caret-down")
    },

    collapse: function(id) {
      $("#" + id + "-content").hide();
      $("#" + id + "-icon").removeClass("icon-caret-down").addClass("icon-caret-right")
    },

    hasContent: function(id) {
      $('#' + id + '-header').children().removeClass('greyed-header-text');
      $('#' + id + '-icon').removeClass('hidden');
    }
  },

  // Append the content selected by fromSelector to the element(s) selected by toSelector.
  // Used to add reporting content to workunits on the fly, as they progress.
  append: function(fromSelector, toSelector) {
    $(fromSelector).appendTo($(toSelector)).show();
  },

  // Append a string to the element(s) selected by toSelector.
  appendString: function(str, toSelector) {
    $(toSelector).append(str);
  },

  // Creates an object that knows how to manage multiple timers, and periodically emit timings.
  // This allows us to show a rolling client-side timer for a workunit while it's executing.
  createTimerManager: function() {
    // The start time (in ms since the epoch) of each timer.
    // We emit the timing of each timer to the element(s) selected by the appropriate selector.
    // id -> {startTime: ..., selector: ...}
    var timers = {};

    // A handle to the polling event, so we can cancel it if needed.
    var timingEvent = undefined;

    function updateTimers() {
      var now = $.now();
      $.each(timers, function(id, timer) {
        $(timer.selector).html('' + Math.round((now - timer.startTime) / 1000 - 0.5) + 's');
      });
    }

    return {
      startTimer: function(id, selector, init) {
        timers[id] = { 'startTime': init ? init : $.now(), 'selector': selector };
        if (!timingEvent) {
          timingEvent = window.setInterval(updateTimers, 1000);
        }
      },

      stopTimer: function(id) {
        delete timers[id];
        var numTimers = 0;
        $.each(timers, function(k,v) { numTimers++ });
        if (numTimers == 0) {
          window.clearInterval(timingEvent);
          timingEvent = undefined;
        }
      }
    }
  },

  // Creates an object that knows how to poll multiple files by periodically hitting the server.
  // Each polled file is associated with an id, so we can multiplex multiple pollings on
  // on a single server request.
  createPoller: function() {

    // State of each file we're polling.
    // id -> state object. See doStartPolling() below for the fields in a state object.
    var polledFileStates = {};

    // A handle to the polling event, so we can cancel it if needed.
    var pollingEvent = undefined;

    // Only allow one request in-flight at a time.
    var inFlight = false;

    function pollOnce() {
      function forgetId(id) {
        delete polledFileStates[id];
        var n = 0;
        $.each(polledFileStates, function(k, v) { n += 1; });
        if (!n) {
          window.clearInterval(pollingEvent);
          pollingEvent = undefined;
        }
      }

      function createRequestEntry(state, id) {
        return { id: id, path: state.path, pos: state.pos };
      }

      if (!inFlight) {
        inFlight = true;
        $.ajax({
          url: '/poll',
          type: 'GET',
          data: { q: JSON.stringify($.map(polledFileStates, createRequestEntry))},
          dataType: 'json',
          success: function(data, textStatus, jqXHR) {
            function appendNewData() {
              $.each(data, function(id, val) {
                if (id in polledFileStates) {
                  var state = polledFileStates[id];
                  // Execute the initFunc exactly once.
                  if (!state.hasBeenPolledAtLeastOnce) {
                    if (state.initFunc) { state.initFunc(); }
                    state.hasBeenPolledAtLeastOnce = true;
                  }
                  if (state.predicate ? state.predicate(val) : true) {
                    if (state.replace) {
                      // Replacing can reset view state, so only do it if we have to.
                      if (val != state.currentVal) {
                        $(state.selector).html(val);
                      }
                    } else {
                      $(state.selector).append(val);
                      state.pos += val.length;
                    }
                    state.currentVal = val;
                  }
                }
              });
            }

            function checkForStopped() {
              var toDelete = [];
              $.each(polledFileStates, function(id, state) {
                if (state.toBeStopped && state.hasBeenPolledAtLeastOnce) {
                  toDelete.push(id);
                }
              });
              $.each(toDelete, function(idx, id) { forgetId(id); });
            }
            appendNewData();
            checkForStopped();
          },
          error: function(jqXHR, textStatus, errorThrown) {
            // Not necessary to do anything special on error. A future request will catch us up.
          },
          complete: function(jqXHR, textStatus) {
            inFlight = false;
          }
        });
      }
    }

    function doStartPolling(id, path, targetSelector, initFunc, predicate, replace) {
      polledFileStates[id] = {
        path: path,  // Path of file on server to poll, relative to build root.
        pos: 0,  // Position to poll from.
        replace: replace,  // Whether to append or replace the polled content.
        currentVal: '',
        selector: targetSelector,  // append or replace the polled content to this element.
        initFunc: initFunc,  // Execute this exactly once, on first successful polling.
        predicate: predicate,  // append or replace val only if predicate(val) is true.
        hasBeenPolledAtLeastOnce: false,
        toBeStopped: false
      };
      if (!pollingEvent) {
        pollingEvent = window.setInterval(pollOnce, 200);
      }
    }

    // Stop the specified polling.
    function doStopPolling(id) {
      if (id in polledFileStates) {
        polledFileStates[id].toBeStopped = true;
      }
    }

    return {
      // Call this to start polling the specified file, assigning its content to the element(s)
      // selected by the selector. You must assign some unique id to the request.
      // If initFunc is provided, it is called the first time any content is assigned.
      startPolling: function(id, path, targetSelector, initFunc, predicate) {
        doStartPolling(id, path, targetSelector, initFunc, predicate, true);
      },

      // Call this to start tailing the specified file, appending its content to the element(s)
      // selected by the selector. You must assign some unique id to the request.
      // If initFunc is provided, it is called the first time any content is appended.
      startTailing: function(id, path, targetSelector, initFunc, predicate) {
        doStartPolling(id, path, targetSelector, initFunc, predicate, false);
      },

      // Stop the specified polling.
      stopPolling: doStopPolling,

      // Stop the specified tailing.
      stopTailing: doStopPolling
    }
  }
};

// We really only need one global one of each of these. So here they are.
pants.timerManager = pants.createTimerManager();
pants.poller = pants.createPoller();
