/**
 * @license
 * Copyright (C) 2017 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() {
  'use strict';

  /**
   * Fired when the rule has been modified or removed.
   *
   * @event access-modified
   */

  /**
   * Fired when a rule that was previously added was removed.
   * @event added-rule-removed
   */

  const PRIORITY_OPTIONS = [
    'BATCH',
    'INTERACTIVE',
  ];

  const Action = {
    ALLOW: 'ALLOW',
    DENY: 'DENY',
    BLOCK: 'BLOCK',
  };

  const DROPDOWN_OPTIONS = [Action.ALLOW, Action.DENY, Action.BLOCK];

  const ForcePushOptions = {
    ALLOW: [
      {name: 'Allow pushing (but not force pushing)', value: false},
      {name: 'Allow pushing with or without force', value: true},
    ],
    BLOCK: [
      {name: 'Block pushing with or without force', value: false},
      {name: 'Block force pushing', value: true},
    ],
  };

  const FORCE_EDIT_OPTIONS = [
    {
      name: 'No Force Edit',
      value: false,
    },
    {
      name: 'Force Edit',
      value: true,
    },
  ];

  /**
    * @appliesMixin Gerrit.AccessMixin
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
    */
  class GrRuleEditor extends Polymer.mixinBehaviors( [
    Gerrit.AccessBehavior,
    Gerrit.BaseUrlBehavior,
    /**
       * Unused in this element, but called by other elements in tests
       * e.g gr-permission_test.
       */
    Gerrit.FireBehavior,
    Gerrit.URLEncodingBehavior,
  ], Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element))) {
    static get is() { return 'gr-rule-editor'; }

    static get properties() {
      return {
        hasRange: Boolean,
        /** @type {?} */
        label: Object,
        editing: {
          type: Boolean,
          value: false,
          observer: '_handleEditingChanged',
        },
        groupId: String,
        groupName: String,
        permission: String,
        /** @type {?} */
        rule: {
          type: Object,
          notify: true,
        },
        section: String,

        _deleted: {
          type: Boolean,
          value: false,
        },
        _originalRuleValues: Object,
      };
    }

    static get observers() {
      return [
        '_handleValueChange(rule.value.*)',
      ];
    }

    created() {
      super.created();
      this.addEventListener('access-saved',
          () => this._handleAccessSaved());
    }

    ready() {
      super.ready();
      // Called on ready rather than the observer because when new rules are
      // added, the observer is triggered prior to being ready.
      if (!this.rule) { return; } // Check needed for test purposes.
      this._setupValues(this.rule);
    }

    attached() {
      super.attached();
      if (!this.rule) { return; } // Check needed for test purposes.
      if (!this._originalRuleValues) {
        // Observer _handleValueChange is called after the ready()
        // method finishes. Original values must be set later to
        // avoid set .modified flag to true
        this._setOriginalRuleValues(this.rule.value);
      }
    }

    _setupValues(rule) {
      if (!rule.value) {
        this._setDefaultRuleValues();
      }
    }

    _computeForce(permission, action) {
      if (this.permissionValues.push.id === permission &&
          action !== Action.DENY) {
        return true;
      }

      return this.permissionValues.editTopicName.id === permission;
    }

    _computeForceClass(permission, action) {
      return this._computeForce(permission, action) ? 'force' : '';
    }

    _computeGroupPath(group) {
      return `${this.getBaseUrl()}/admin/groups/${this.encodeURL(group, true)}`;
    }

    _handleAccessSaved() {
      // Set a new 'original' value to keep track of after the value has been
      // saved.
      this._setOriginalRuleValues(this.rule.value);
    }

    _handleEditingChanged(editing, editingOld) {
      // Ignore when editing gets set initially.
      if (!editingOld) { return; }
      // Restore original values if no longer editing.
      if (!editing) {
        this._handleUndoChange();
      }
    }

    _computeSectionClass(editing, deleted) {
      const classList = [];
      if (editing) {
        classList.push('editing');
      }
      if (deleted) {
        classList.push('deleted');
      }
      return classList.join(' ');
    }

    _computeForceOptions(permission, action) {
      if (permission === this.permissionValues.push.id) {
        if (action === Action.ALLOW) {
          return ForcePushOptions.ALLOW;
        } else if (action === Action.BLOCK) {
          return ForcePushOptions.BLOCK;
        } else {
          return [];
        }
      } else if (permission === this.permissionValues.editTopicName.id) {
        return FORCE_EDIT_OPTIONS;
      }
      return [];
    }

    _getDefaultRuleValues(permission, label) {
      const ruleAction = Action.ALLOW;
      const value = {};
      if (permission === 'priority') {
        value.action = PRIORITY_OPTIONS[0];
        return value;
      } else if (label) {
        value.min = label.values[0].value;
        value.max = label.values[label.values.length - 1].value;
      } else if (this._computeForce(permission, ruleAction)) {
        value.force =
            this._computeForceOptions(permission, ruleAction)[0].value;
      }
      value.action = DROPDOWN_OPTIONS[0];
      return value;
    }

    _setDefaultRuleValues() {
      this.set('rule.value', this._getDefaultRuleValues(this.permission,
          this.label));
    }

    _computeOptions(permission) {
      if (permission === 'priority') {
        return PRIORITY_OPTIONS;
      }
      return DROPDOWN_OPTIONS;
    }

    _handleRemoveRule() {
      if (this.rule.value.added) {
        this.dispatchEvent(new CustomEvent(
            'added-rule-removed', {bubbles: true, composed: true}));
      }
      this._deleted = true;
      this.rule.value.deleted = true;
      this.dispatchEvent(
          new CustomEvent('access-modified', {bubbles: true, composed: true}));
    }

    _handleUndoRemove() {
      this._deleted = false;
      delete this.rule.value.deleted;
    }

    _handleUndoChange() {
      // gr-permission will take care of removing rules that were added but
      // unsaved. We need to keep the added bit for the filter.
      if (this.rule.value.added) { return; }
      this.set('rule.value', Object.assign({}, this._originalRuleValues));
      this._deleted = false;
      delete this.rule.value.deleted;
      delete this.rule.value.modified;
    }

    _handleValueChange() {
      if (!this._originalRuleValues) { return; }
      this.rule.value.modified = true;
      // Allows overall access page to know a change has been made.
      this.dispatchEvent(
          new CustomEvent('access-modified', {bubbles: true, composed: true}));
    }

    _setOriginalRuleValues(value) {
      this._originalRuleValues = Object.assign({}, value);
    }
  }

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