/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * 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.
 * =============================================================================
 */

import * as tfc from '@tensorflow/tfjs-core';

import {NamedTensorsMap} from '../../data/types';
import {ExecutionContext} from '../../executor/execution_context';
import {InternalOpExecutor, Node} from '../types';

import {getParamValue} from './utils';

export const executeOp: InternalOpExecutor = (node: Node,
                                              tensorMap: NamedTensorsMap,
                                              context: ExecutionContext):
                                                 tfc.Tensor[] => {
  switch (node.op) {
    case 'Equal': {
      return [tfc.equal(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'NotEqual': {
      return [tfc.notEqual(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'Greater': {
      return [tfc.greater(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'GreaterEqual': {
      return [tfc.greaterEqual(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'Less': {
      return [tfc.less(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'LessEqual': {
      return [tfc.lessEqual(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'LogicalAnd': {
      return [tfc.logicalAnd(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'LogicalNot': {
      return [tfc.logicalNot(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'LogicalOr': {
      return [tfc.logicalOr(
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    case 'Select':
    case 'SelectV2': {
      return [tfc.where(
          getParamValue('condition', node, tensorMap, context) as tfc.Tensor,
          getParamValue('a', node, tensorMap, context) as tfc.Tensor,
          getParamValue('b', node, tensorMap, context) as tfc.Tensor)];
    }
    default:
      throw TypeError(`Node type ${node.op} is not implemented`);
  }
};

export const CATEGORY = 'logical';