/**
 * @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);
  },

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

  members: {
    _asleep: true,
    _changesets: null,

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

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

    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);
      }
    },

    _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);
    },

    _onaction: function(action, e) {
      // TODO: This can become a kill once things fully switch over..
      e.prevent();

      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;
      }
    },

    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');
      }
    },

    _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);
    }

  }

});