/*-
 * ============LICENSE_START=======================================================
 * ONAP CLAMP
 * ================================================================================
 * Copyright (C) 2020 AT&T Intellectual Property. 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.
 * ============LICENSE_END============================================
 * ===================================================================
 *
 */

import React from 'react'
import Select from 'react-select';
import Button from 'react-bootstrap/Button';
import Modal from 'react-bootstrap/Modal';
import Form from 'react-bootstrap/Form';
import Row from 'react-bootstrap/Row';
import Col from 'react-bootstrap/Col';
import styled from 'styled-components';
import LoopService from '../../../api/LoopService';
import TemplateService from '../../../api/TemplateService';
import LoopCache from '../../../api/LoopCache';
import SvgGenerator from '../../loop_viewer/svg/SvgGenerator';

const ModalStyled = styled(Modal)`
  background-color: transparent;
`

const ErrMsgStyled = styled.div`
  color: red;
`

export default class CreateLoopModal extends React.Component {
  constructor(props, context) {
    super(props, context);

    this.getAllLoopTemplates = this.getAllLoopTemplates.bind(this);
    this.handleCreate = this.handleCreate.bind(this);
    this.handleModelName = this.handleModelName.bind(this);
    this.handleClose = this.handleClose.bind(this);
    this.handleDropDownListChange = this.handleDropDownListChange.bind(this);
    this.renderSvg = this.renderSvg.bind(this);
    this.state = {
      show: true,
      chosenTemplateName: '',
      modelInputErrMsg: '',
      modelName: '',
      templateNames: [],
      fakeLoopCacheWithTemplate: new LoopCache({})
    };
  }

  async componentDidMount() {
    await this.getAllLoopTemplates();
    await this.getModelNames();
  }

  handleClose() {
    this.setState({ show: false });
    this.props.history.push('/');
  }

  handleDropDownListChange(e) {
    if (typeof e.value !== "undefined") {
      this.setState({
        fakeLoopCacheWithTemplate:
          new LoopCache({
            "loopTemplate": e.templateObject,
            "name": "fakeLoop"
          }),
        chosenTemplateName: e.value
      })
    } else {
      this.setState({ fakeLoopCacheWithTemplate: new LoopCache({}) })
    }
  }

  getAllLoopTemplates() {
    TemplateService.getAllLoopTemplates().then(templatesData => {
      const templateOptions = templatesData.map((templateData) => {
        return { label: templateData.name, value: templateData.name, templateObject: templateData }
      });
      this.setState({
        templateNames: templateOptions
      })
    });
  }

  getModelNames() {
    TemplateService.getLoopNames().then(loopNames => {
      if (!loopNames) {
        loopNames = [];
      }
      // Remove LOOP_ prefix
      let trimmedLoopNames = loopNames.map(str => str.replace('LOOP_', ''));
      this.setState({ modelNames: trimmedLoopNames });
    });
  }

  handleCreate() {
    if (!this.state.modelName) {
      alert("A model name is required");
      return;
    }
    console.debug("Create Model " + this.state.modelName + ", Template " + this.state.chosenTemplateName + " is chosen");
    this.setState({ show: false });
    LoopService.createLoop("LOOP_" + this.state.modelName, this.state.chosenTemplateName).then(text => {
      console.debug("CreateLoop response received: ", text);
      try {
        this.props.history.push('/');
        this.props.loadLoopFunction("LOOP_" + this.state.modelName);
      } catch (err) {
        alert(text);
        this.props.history.push('/');
      }
    })
      .catch(error => {
        console.debug("Create Loop failed");
      });
  }

  handleModelName(event) {
    if (this.state.modelNames.includes(event.target.value)) {
      this.setState({
        modelInputErrMsg: 'A model named "' + event.target.value + '" already exists. Please pick another name.',
        modelName: event.target.value
      });
      return;
    } else {
      this.setState({
        modelInputErrMsg: '',
        modelName: event.target.value
      });
    }
  }

  renderSvg() {
    return (
      <SvgGenerator loopCache={ this.state.fakeLoopCacheWithTemplate } clickable={ false } generatedFrom={ SvgGenerator.GENERATED_FROM_TEMPLATE }/>
    );
  }

  render() {
    return (
      <ModalStyled size="xl" show={ this.state.show } onHide={ this.handleClose } backdrop="static" keyboard={ false }>
        <Modal.Header closeButton>
          <Modal.Title>Create Model</Modal.Title>
        </Modal.Header>
        <Modal.Body>
          <Form.Group as={ Row } controlId="formPlaintextEmail">
            <Form.Label column sm="2">Template Name:</Form.Label>
            <Col sm="10">
              <Select onChange={ this.handleDropDownListChange } options={ this.state.templateNames }/>
            </Col>
          </Form.Group>
          <Form.Group as={ Row } style={ { alignItems: 'center' } } controlId="formSvgPreview">
            <Form.Label column sm="2">Model Preview:</Form.Label>
            <Col sm="10">
              { this.renderSvg() }
            </Col>
          </Form.Group>
          <Form.Group as={ Row } controlId="formPlaintextEmail">
            <Form.Label column sm="2">Model Name:</Form.Label>
            <input sm="5" type="text" style={ { width: '50%', marginLeft: '1em' } }
                   value={ this.state.modelName }
                   onChange={ this.handleModelName }
            />
            <span sm="5"/>
          </Form.Group>
          <Form.Group as={ Row } controlId="formPlaintextEmail">
            <Form.Label column sm="2"> </Form.Label>
            <ErrMsgStyled>{ this.state.modelInputErrMsg }</ErrMsgStyled>
          </Form.Group>
        </Modal.Body>
        <Modal.Footer>
          <Button variant="secondary" type="null" onClick={ this.handleClose }>Cancel</Button>
          <Button variant="primary" type="submit" onClick={ this.handleCreate }>Create</Button>
        </Modal.Footer>
      </ModalStyled>
    );
  }
}