// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.client.change;

import com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.changes.ChangeApi;
import com.google.gerrit.client.changes.ReviewInput;
import com.google.gerrit.client.changes.ReviewInput.DraftHandling;
import com.google.gerrit.client.info.ChangeInfo;
import com.google.gerrit.client.info.ChangeInfo.LabelInfo;
import com.google.gerrit.client.rpc.GerritCallback;
import com.google.gerrit.client.rpc.Natives;
import com.google.gerrit.common.PageLinks;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gwt.core.client.JsArrayString;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder;

/** Applies a label with one mouse click. */
class QuickApprove extends Button implements ClickHandler {
  private Change.Id changeId;
  private String revision;
  private ReviewInput input;
  private ReplyAction replyAction;

  QuickApprove() {
    addClickHandler(this);
  }

  void set(ChangeInfo info, String commit, ReplyAction action) {
    if (!info.hasPermittedLabels() || !info.status().isOpen()) {
      // Quick approve needs at least one label on an open change.
      setVisible(false);
      return;
    }
    if (info.revision(commit).isEdit() || info.revision(commit).draft()) {
      setVisible(false);
      return;
    }

    String qName = null;
    String qValueStr = null;
    short qValue = 0;

    int index = info.getMissingLabelIndex();
    if (index != -1) {
      LabelInfo label = Natives.asList(info.allLabels().values()).get(index);
      JsArrayString values = info.permittedValues(label.name());
      String s = values.get(values.length() - 1);
      short v = LabelInfo.parseValue(s);
      if (v > 0 && s.equals(label.maxValue())) {
        qName = label.name();
        qValueStr = s;
        qValue = v;
      }
    }

    if (qName != null) {
      changeId = info.legacyId();
      revision = commit;
      input = ReviewInput.create();
      input.drafts(DraftHandling.PUBLISH_ALL_REVISIONS);
      input.label(qName, qValue);
      replyAction = action;
      setText(qName + qValueStr);
      setVisible(true);
    } else {
      setVisible(false);
    }
  }

  @Override
  public void setText(String text) {
    setHTML(new SafeHtmlBuilder().openDiv().append(text).closeDiv());
  }

  @Override
  public void onClick(ClickEvent event) {
    if (replyAction != null && replyAction.isVisible()) {
      replyAction.quickApprove(input);
    } else {
      ChangeApi.revision(changeId.get(), revision)
        .view("review")
        .post(input, new GerritCallback<ReviewInput>() {
          @Override
          public void onSuccess(ReviewInput result) {
            Gerrit.display(PageLinks.toChange(changeId));
          }
        });
    }
  }
}