// Copyright (C) 2019 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.
(function() {
  class RvFilterSection extends Polymer.Element {
    static get is() { return 'rv-filter-section'; }

    static get properties() {
      return {
        pluginRestApi: Object,
        repoName: String,
        reviewers: Array,
        filter: String,
        canModifyConfig: Boolean,
        _originalFilter: String,
        _editingReviewer: {
          type: Boolean,
          value: false,
        },
        reviewersUrl: String,
      };
    }

    connectedCallback() {
      super.connectedCallback();
      this._updateSection();
    }

    _updateSection() {
      this._originalFilter = this.filter;
    }

    _computeEditing(filter, _originalFilter) {
      if (_originalFilter === '') {
        return true;
      }
      return filter === '';
    }

    _computeCancelHidden(filter, _originalFilter) {
      return !this._computeEditing(filter, _originalFilter);
    }

    _computeAddBtnHidden(canModifyConfig, editingReviewer) {
      return !(canModifyConfig && !editingReviewer);
    }

    _computeFilterInputDisabled(canModifyConfig, originalFilter) {
      return !canModifyConfig || originalFilter !== '';
    }

    _handleCancel() {
      this.remove();
    }

    _handleReviewerDeleted(e) {
      if (e.detail.editing) {
        this.reviewers.pop();
        this._editingReviewer = false;
      } else {
        const index = e.model.index;
        const deleted = this.reviewers[index];
        this._putReviewer(deleted, 'DELETE');
      }
    }

    _handleReviewerAdded(e) {
      this._editingReviewer = false;
      this._putReviewer(e.detail.reviewer, 'ADD').catch(err => {
        this.fire('show-alert', {message: err});
        throw err;
      });
    }

    _putReviewer(reviewer, action) {
      return this.pluginRestApi.put(this.reviewersUrl, {
        action,
        reviewer,
        filter: this.filter,
      }).then(result => {
        const detail = {result};
        this.dispatchEvent(
            new CustomEvent('reviewer-changed', {detail, bubbles: true}));
      });
    }

    _handleAddReviewer() {
      this.push('reviewers', '');
      this._editingReviewer = true;
    }
  }

  customElements.define(RvFilterSection.is, RvFilterSection);
})();