/**
 * @provides phabricator-diff-changeset-list
 * @requires javelin-install
 * @javelin
 */

JX.install('DiffChangesetList', {

  construct: function() {
    this._changesets = [];

    var onload = JX.bind(this, this._ifawake, this._onload);
    JX.Stratcom.listen('click', 'differential-load', onload);

    var onmore = JX.bind(this, this._ifawake, this._onmore);
    JX.Stratcom.listen('click', 'show-more', onmore);

    var onmenu = JX.bind(this, this._ifawake, this._onmenu);
    JX.Stratcom.listen('click', 'differential-view-options', onmenu);

    var onhide = JX.bind(this, this._ifawake, this._onhide);
    JX.Stratcom.listen('click', 'hide-inline', onhide);

    var onreveal = JX.bind(this, this._ifawake, this._onreveal);
    JX.Stratcom.listen('click', 'reveal-inline', onreveal);

    var onedit = JX.bind(this, this._ifawake, this._onaction, 'edit');
    JX.Stratcom.listen(
      'click',
      ['differential-inline-comment', 'differential-inline-edit'],
      onedit);

    var ondone = JX.bind(this, this._ifawake, this._onaction, 'done');
    JX.Stratcom.listen(
      'click',
      ['differential-inline-comment', 'differential-inline-done'],
      ondone);

    var ondelete = JX.bind(this, this._ifawake, this._onaction, 'delete');
    JX.Stratcom.listen(
      'click',
      ['differential-inline-comment', 'differential-inline-delete'],
      ondelete);

    var onreply = JX.bind(this, this._ifawake, this._onaction, 'reply');
    JX.Stratcom.listen(
      'click',
      ['differential-inline-comment', 'differential-inline-reply'],
      onreply);

    var onresize = JX.bind(this, this._ifawake, this._onresize);
    JX.Stratcom.listen('resize', null, onresize);
  },

  properties: {
    translations: null,
    inlineURI: null
  },

  members: {
    _initialized: false,
    _asleep: true,
    _changesets: null,

    _cursorItem: null,

    _focusNode: null,
    _focusStart: null,
    _focusEnd: null,

    sleep: function() {
      this._asleep = true;

      this._redrawFocus();
    },

    wake: function() {
      this._asleep = false;

      this._redrawFocus();

      if (this._initialized) {
        return;
      }

      this._initialized = true;
      var pht = this.getTranslations();

      var label;

      label = pht('Jump to next change.');
      this._installJumpKey('j', label, 1);

      label = pht('Jump to previous change.');
      this._installJumpKey('k', label, -1);

      label = pht('Jump to next file.');
      this._installJumpKey('J', label, 1, 'file');

      label = pht('Jump to previous file.');
      this._installJumpKey('K', label, -1, 'file');

      label = pht('Jump to next inline comment.');
      this._installJumpKey('n', label, 1, 'comment');

      label = pht('Jump to previous inline comment.');
      this._installJumpKey('p', label, -1, 'comment');

      label = pht('Jump to next inline comment, including hidden comments.');
      this._installJumpKey('N', label, 1, 'comment', true);

      label = pht(
        'Jump to previous inline comment, including hidden comments.');
      this._installJumpKey('P', label, -1, 'comment', true);

      label = pht('Jump to the table of contents.');
      this._installKey('t', label, this._ontoc);

      label = pht('Reply to selected inline comment.');
      this._installKey('r', label, this._onkeyreply);

      label = pht('Edit selected inline comment.');
      this._installKey('e', label, this._onkeyedit);

      label = pht('Mark or unmark selected inline comment as done.');
      this._installKey('w', label, this._onkeydone);

      label = pht('Hide or show inline comment.');
      this._installKey('q', label, this._onkeyhide);
    },

    isAsleep: function() {
      return this._asleep;
    },

    newChangesetForNode: function(node) {
      var changeset = JX.DiffChangeset.getForNode(node);

      this._changesets.push(changeset);
      changeset.setChangesetList(this);

      return changeset;
    },

    getChangesetForNode: function(node) {
      return JX.DiffChangeset.getForNode(node);
    },

    getInlineByID: function(id) {
      var inline = null;

      for (var ii = 0; ii < this._changesets.length; ii++) {
        inline = this._changesets[ii].getInlineByID(id);
        if (inline) {
          break;
        }
      }

      return inline;
    },

    _ifawake: function(f) {
      // This function takes another function and only calls it if the
      // changeset list is awake, so we basically just ignore events when we
      // are asleep. This may move up the stack at some point as we do more
      // with Quicksand/Sheets.

      if (this.isAsleep()) {
        return;
      }

      return f.apply(this, [].slice.call(arguments, 1));
    },

    _onload: function(e) {
      var data = e.getNodeData('differential-load');

      // NOTE: We can trigger a load from either an explicit "Load" link on
      // the changeset, or by clicking a link in the table of contents. If
      // the event was a table of contents link, we let the anchor behavior
      // run normally.
      if (data.kill) {
        e.kill();
      }

      var node = JX.$(data.id);
      var changeset = this.getChangesetForNode(node);

      changeset.load();

      // TODO: Move this into Changeset.
      var routable = changeset.getRoutable();
      if (routable) {
        routable.setPriority(2000);
      }
    },

    _installKey: function(key, label, handler) {
      handler = JX.bind(this, this._ifawake, handler);

      return new JX.KeyboardShortcut(key, label)
        .setHandler(handler)
        .register();
    },

    _installJumpKey: function(key, label, delta, filter, show_hidden) {
      filter = filter || null;
      var handler = JX.bind(this, this._onjumpkey, delta, filter, show_hidden);
      return this._installKey(key, label, handler);
    },

    _ontoc: function(manager) {
      var toc = JX.$('toc');
      manager.scrollTo(toc);
    },

    _onkeyreply: function() {
      var cursor = this._cursorItem;

      if (cursor) {
        if (cursor.type == 'comment') {
          var inline = cursor.target;
          if (inline.canReply()) {
            this.setFocus(null);

            inline.reply();
            return;
          }
        }
      }

      var pht = this.getTranslations();
      this._warnUser(pht('You must select a comment to reply to.'));
    },

    _onkeyedit: function() {
      var cursor = this._cursorItem;

      if (cursor) {
        if (cursor.type == 'comment') {
          var inline = cursor.target;
          if (inline.canEdit()) {
            this.setFocus(null);

            inline.edit();
            return;
          }
        }
      }

      var pht = this.getTranslations();
      this._warnUser(pht('You must select a comment to edit.'));
    },

    _onkeydone: function() {
      var cursor = this._cursorItem;

      if (cursor) {
        if (cursor.type == 'comment') {
          var inline = cursor.target;
          if (inline.canDone()) {
            this.setFocus(null);

            inline.toggleDone();
            return;
          }
        }
      }

      var pht = this.getTranslations();
      this._warnUser(pht('You must select a comment to mark done.'));
    },

    _onkeyhide: function() {
      var cursor = this._cursorItem;

      if (cursor) {
        if (cursor.type == 'comment') {
          var inline = cursor.target;
          if (inline.canHide()) {
            this.setFocus(null);

            inline.setHidden(!inline.isHidden());
            return;
          }
        }
      }

      var pht = this.getTranslations();
      this._warnUser(pht('You must select a comment to hide.'));
    },

    _warnUser: function(message) {
      new JX.Notification()
        .setContent(message)
        .alterClassName('jx-notification-alert', true)
        .setDuration(1000)
        .show();
    },

    _onjumpkey: function(delta, filter, show_hidden, manager) {
      var state = this._getSelectionState();

      var cursor = state.cursor;
      var items = state.items;

      // If there's currently no selection and the user tries to go back,
      // don't do anything.
      if ((cursor === null) && (delta < 0)) {
        return;
      }

      while (true) {
        if (cursor === null) {
          cursor = 0;
        } else {
          cursor = cursor + delta;
        }

        // If we've gone backward past the first change, bail out.
        if (cursor < 0) {
          return;
        }

        // If we've gone forward off the end of the list, bail out.
        if (cursor >= items.length) {
          return;
        }

        // If we're selecting things of a particular type (like only files)
        // and the next item isn't of that type, move past it.
        if (filter !== null) {
          if (items[cursor].type !== filter) {
            continue;
          }
        }

        // If the item is hidden, don't select it when iterating with jump
        // keys. It can still potentially be selected in other ways.
        if (!show_hidden) {
          if (items[cursor].hidden) {
            continue;
          }
        }

        // Otherwise, we've found a valid item to select.
        break;
      }

      this._setSelectionState(items[cursor], manager);
    },

    _getSelectionState: function() {
      var items = this._getSelectableItems();

      var cursor = null;
      if (this._cursorItem !== null) {
        for (var ii = 0; ii < items.length; ii++) {
          var item = items[ii];
          if (this._cursorItem.target === item.target) {
            cursor = ii;
            break;
          }
        }
      }

      return {
        cursor: cursor,
        items: items
      };
    },

    _setSelectionState: function(item, manager) {
      this._cursorItem = item;

      this._redrawSelection(manager, true);

      return this;
    },

    _redrawSelection: function(manager, scroll) {
      var cursor = this._cursorItem;
      if (!cursor) {
        this.setFocus(null);
        return;
      }

      this.setFocus(cursor.nodes.begin, cursor.nodes.end);

      if (manager && scroll) {
        manager.scrollTo(cursor.nodes.begin);
      }

      return this;
    },

    redrawCursor: function() {
      // NOTE: This is setting the cursor to the current cursor. Usually, this
      // would have no effect.

      // However, if the old cursor pointed at an inline and the inline has
      // been edited so the rows have changed, this updates the cursor to point
      // at the new inline with the proper rows for the current state, and
      // redraws the reticle correctly.

      var state = this._getSelectionState();
      if (state.cursor !== null) {
        this._setSelectionState(state.items[state.cursor]);
      }
    },

    _getSelectableItems: function() {
      var result = [];

      for (var ii = 0; ii < this._changesets.length; ii++) {
        var items = this._changesets[ii].getSelectableItems();
        for (var jj = 0; jj < items.length; jj++) {
          result.push(items[jj]);
        }
      }

      return result;
    },

    _onmore: function(e) {
      e.kill();

      var node = e.getNode('differential-changeset');
      var changeset = this.getChangesetForNode(node);

      var data = e.getNodeData('show-more');
      var target = e.getNode('context-target');

      changeset.loadContext(data.range, target);
    },

    _onmenu: function(e) {
      var button = e.getNode('differential-view-options');

      var data = JX.Stratcom.getData(button);
      if (data.menu) {
        // We've already built this menu, so we can let the menu itself handle
        // the event.
        return;
      }

      e.prevent();

      var pht = this.getTranslations();

      var node = JX.DOM.findAbove(
        button,
        'div',
        'differential-changeset');

      var changeset = this.getChangesetForNode(node);

      var menu = new JX.PHUIXDropdownMenu(button);
      var list = new JX.PHUIXActionListView();

      var add_link = function(icon, name, href, local) {
        if (!href) {
          return;
        }

        var link = new JX.PHUIXActionView()
          .setIcon(icon)
          .setName(name)
          .setHref(href)
          .setHandler(function(e) {
            if (local) {
              window.location.assign(href);
            } else {
              window.open(href);
            }
            menu.close();
            e.prevent();
          });

        list.addItem(link);
        return link;
      };

      var reveal_item = new JX.PHUIXActionView()
        .setIcon('fa-eye');
      list.addItem(reveal_item);

      var visible_item = new JX.PHUIXActionView()
        .setHandler(function(e) {
          var diff = JX.DOM.scry(
            JX.$(data.containerID),
            'table',
            'differential-diff');

          JX.Stratcom.invoke('differential-toggle-file', null, {diff: diff});
          e.prevent();
          menu.close();
        });
      list.addItem(visible_item);

      add_link('fa-file-text', pht('Browse in Diffusion'), data.diffusionURI);
      add_link('fa-file-o', pht('View Standalone'), data.standaloneURI);

      var up_item = new JX.PHUIXActionView()
        .setHandler(function(e) {
          if (changeset.isLoaded()) {
            var renderer = changeset.getRenderer();
            if (renderer == '1up') {
              renderer = '2up';
            } else {
              renderer = '1up';
            }
            changeset.setRenderer(renderer);
          }
          changeset.reload();

          e.prevent();
          menu.close();
        });
      list.addItem(up_item);

      var encoding_item = new JX.PHUIXActionView()
        .setIcon('fa-font')
        .setName(pht('Change Text Encoding...'))
        .setHandler(function(e) {
          var params = {
            encoding: changeset.getEncoding()
          };

          new JX.Workflow('/services/encoding/', params)
            .setHandler(function(r) {
              changeset.setEncoding(r.encoding);
              changeset.reload();
            })
            .start();

          e.prevent();
          menu.close();
        });
      list.addItem(encoding_item);

      var highlight_item = new JX.PHUIXActionView()
        .setIcon('fa-sun-o')
        .setName(pht('Highlight As...'))
        .setHandler(function(e) {
          var params = {
            highlight: changeset.getHighlight()
          };

          new JX.Workflow('/services/highlight/', params)
            .setHandler(function(r) {
              changeset.setHighlight(r.highlight);
              changeset.reload();
            })
            .start();

          e.prevent();
          menu.close();
        });
      list.addItem(highlight_item);

      add_link('fa-arrow-left', pht('Show Raw File (Left)'), data.leftURI);
      add_link('fa-arrow-right', pht('Show Raw File (Right)'), data.rightURI);
      add_link('fa-pencil', pht('Open in Editor'), data.editor, true);
      add_link('fa-wrench', pht('Configure Editor'), data.editorConfigure);

      menu.setContent(list.getNode());

      menu.listen('open', function() {
        // When the user opens the menu, check if there are any "Show More"
        // links in the changeset body. If there aren't, disable the "Show
        // Entire File" menu item since it won't change anything.

        var nodes = JX.DOM.scry(JX.$(data.containerID), 'a', 'show-more');
        if (nodes.length) {
          reveal_item
            .setDisabled(false)
            .setName(pht('Show All Context'))
            .setIcon('fa-file-o')
            .setHandler(function(e) {
              changeset.loadAllContext();
              e.prevent();
              menu.close();
            });
        } else {
          reveal_item
            .setDisabled(true)
            .setIcon('fa-file')
            .setName(pht('All Context Shown'))
            .setHandler(function(e) { e.prevent(); });
        }

        encoding_item.setDisabled(!changeset.isLoaded());
        highlight_item.setDisabled(!changeset.isLoaded());

        if (changeset.isLoaded()) {
          if (changeset.getRenderer() == '2up') {
            up_item
              .setIcon('fa-list-alt')
              .setName(pht('View Unified'));
          } else {
            up_item
              .setIcon('fa-files-o')
              .setName(pht('View Side-by-Side'));
          }
        } else {
          up_item
            .setIcon('fa-refresh')
            .setName(pht('Load Changes'));
        }

        visible_item
          .setDisabled(true)
          .setIcon('fa-expand')
          .setName(pht('Can\'t Toggle Unloaded File'));
        var diffs = JX.DOM.scry(
          JX.$(data.containerID),
          'table',
          'differential-diff');

        if (diffs.length > 1) {
          JX.$E(
            'More than one node with sigil "differential-diff" was found in "'+
            data.containerID+'."');
        } else if (diffs.length == 1) {
          var diff = diffs[0];
          visible_item.setDisabled(false);
          if (JX.Stratcom.getData(diff).hidden) {
            visible_item
              .setName(pht('Expand File'))
              .setIcon('fa-expand');
          } else {
            visible_item
              .setName(pht('Collapse File'))
              .setIcon('fa-compress');
          }
        } else {
          // Do nothing when there is no diff shown in the table. For example,
          // the file is binary.
        }

      });

      data.menu = menu;
      menu.open();
    },

    _onhide: function(e) {
      this._onhidereveal(e, true);
    },

    _onreveal: function(e) {
      this._onhidereveal(e, false);
    },

    _onhidereveal: function(e, is_hide) {
      e.kill();

      var inline = this._getInlineForEvent(e);

      inline.setHidden(is_hide);
    },

    _onresize: function() {
      this._redrawFocus();
    },

    _onaction: function(action, e) {
      e.kill();

      var inline = this._getInlineForEvent(e);
      var is_ref = false;

      // If we don't have a natural inline object, the user may have clicked
      // an action (like "Delete") inside a preview element at the bottom of
      // the page.

      // If they did, try to find an associated normal inline to act on, and
      // pretend they clicked that instead. This makes the overall state of
      // the page more consistent.

      // However, there may be no normal inline (for example, because it is
      // on a version of the diff which is not visible). In this case, we
      // act by reference.

      if (inline === null) {
        var data = e.getNodeData('differential-inline-comment');
        inline = this.getInlineByID(data.id);
        if (inline) {
          is_ref = true;
        } else {
          switch (action) {
            case 'delete':
              this._deleteInlineByID(data.id);
              return;
          }
        }
      }

      // TODO: For normal operations, highlight the inline range here.

      switch (action) {
        case 'edit':
          inline.edit();
          break;
        case 'done':
          inline.toggleDone();
          break;
        case 'delete':
          inline.delete(is_ref);
          break;
        case 'reply':
          inline.reply();
          break;
      }
    },

    redrawPreview: function() {
      // TODO: This isn't the cleanest way to find the preview form, but
      // rendering no longer has direct access to it.
      var forms = JX.DOM.scry(document.body, 'form', 'transaction-append');
      if (forms.length) {
        JX.DOM.invoke(forms[0], 'shouldRefresh');
      }
    },

    setFocus: function(node, extended_node) {
      this._focusStart = node;
      this._focusEnd = extended_node;
      this._redrawFocus();
    },

    _redrawFocus: function() {
      var node = this._focusStart;
      var extended_node = this._focusEnd || node;

      var reticle = this._getFocusNode();
      if (!node || this.isAsleep()) {
        JX.DOM.remove(reticle);
        return;
      }

      // Outset the reticle some pixels away from the element, so there's some
      // space between the focused element and the outline.
      var p = JX.Vector.getPos(node);
      var s = JX.Vector.getAggregateScrollForNode(node);

      p.add(s).add(-4, -4).setPos(reticle);
      // Compute the size we need to extend to the full extent of the focused
      // nodes.
      JX.Vector.getPos(extended_node)
        .add(-p.x, -p.y)
        .add(JX.Vector.getDim(extended_node))
        .add(8, 8)
        .setDim(reticle);

      JX.DOM.getContentFrame().appendChild(reticle);
    },

    _getFocusNode: function() {
      if (!this._focusNode) {
        var node = JX.$N('div', {className : 'keyboard-focus-focus-reticle'});
        this._focusNode = node;
      }
      return this._focusNode;
    },

    _deleteInlineByID: function(id) {
      var uri = this.getInlineURI();
      var data = {
        op: 'refdelete',
        id: id
      };

      var handler = JX.bind(this, this.redrawPreview);

      new JX.Workflow(uri, data)
        .setHandler(handler)
        .start();
    },

    _getInlineForEvent: function(e) {
      var node = e.getNode('differential-changeset');
      if (!node) {
        return null;
      }

      var changeset = this.getChangesetForNode(node);

      var inline_row = e.getNode('inline-row');
      return changeset.getInlineForRow(inline_row);
    }

  }

});