import React, { Fragment, useEffect, useState } from 'react';
import {
  Breadcrumb,
  BreadcrumbItem,
  Row,
  Col,
  Card,
  CardBody,
  Button,
  ButtonGroup,
  Form,
  FormGroup,
  Input,
  Label,
  Spinner,
} from 'reactstrap';
import Datetime from 'react-datetime';
import moment from 'moment';
import loadable from '@loadable/component';
import Cascader from 'rc-cascader';
import { getCookieValue, createCookie } from '../../../helpers/utils';
import withRedirect from '../../../hoc/withRedirect';
import { withTranslation } from 'react-i18next';
import { toast } from 'react-toastify';
import ButtonIcon from '../../common/ButtonIcon';
import { APIBaseURL } from '../../../config';


const DetailedDataTable = loadable(() => import('../common/DetailedDataTable'));


const MeterBatch = ({ setRedirect, setRedirectUrl, t }) => {
  let current_moment = moment();
  useEffect(() => {
    let is_logged_in = getCookieValue('is_logged_in');
    let user_name = getCookieValue('user_name');
    let user_display_name = getCookieValue('user_display_name');
    let user_uuid = getCookieValue('user_uuid');
    let token = getCookieValue('token');
    if (is_logged_in === null || !is_logged_in) {
      setRedirectUrl(`/authentication/basic/login`);
      setRedirect(true);
    } else {
      //update expires time of cookies
      createCookie('is_logged_in', true, 1000 * 60 * 60 * 8);
      createCookie('user_name', user_name, 1000 * 60 * 60 * 8);
      createCookie('user_display_name', user_display_name, 1000 * 60 * 60 * 8);
      createCookie('user_uuid', user_uuid, 1000 * 60 * 60 * 8);
      createCookie('token', token, 1000 * 60 * 60 * 8);
    }
  });
  // State
  // Query Parameters
  const [selectedSpaceName, setSelectedSpaceName] = useState(undefined);
  const [selectedSpaceID, setSelectedSpaceID] = useState(undefined);
  const [meterList, setMeterList] = useState([]);
  const [reportingPeriodBeginsDatetime, setReportingPeriodBeginsDatetime] = useState(current_moment.clone().startOf('month'));
  const [reportingPeriodEndsDatetime, setReportingPeriodEndsDatetime] = useState(current_moment);
  const [cascaderOptions, setCascaderOptions] = useState(undefined);
      
  // buttons
  const [submitButtonDisabled, setSubmitButtonDisabled] = useState(false);
  const [spinnerHidden, setSpinnerHidden] = useState(true);
  const [exportButtonHidden, setExportButtonHidden] = useState(true);

  //Results
  const [detailedDataTableColumns, setDetailedDataTableColumns] = useState(
    [{dataField: 'name', text: t('Name'), sort: true}, {dataField: 'space', text: t('Space'), sort: true}]);
  const [excelBytesBase64, setExcelBytesBase64] = useState(undefined);
  
  useEffect(() => {
    let isResponseOK = false;
    fetch(APIBaseURL + '/spaces/tree', {
      method: 'GET',
      headers: {
        "Content-type": "application/json",
        "User-UUID": getCookieValue('user_uuid'),
        "Token": getCookieValue('token')
      },
      body: null,

    }).then(response => {
      console.log(response);
      if (response.ok) {
        isResponseOK = true;
      }
      return response.json();
    }).then(json => {
      console.log(json);
      if (isResponseOK) {
        // rename keys 
        json = JSON.parse(JSON.stringify([json]).split('"id":').join('"value":').split('"name":').join('"label":'));
        setCascaderOptions(json);
        // set the default selected space
        setSelectedSpaceName([json[0]].map(o => o.label));
        setSelectedSpaceID([json[0]].map(o => o.value));

        setSubmitButtonDisabled(false);
        setSpinnerHidden(true);
      } else {
        toast.error(json.description);
      }
    }).catch(err => {
      console.log(err);
    });

  }, []);

  const labelClasses = 'ls text-uppercase text-600 font-weight-semi-bold mb-0';

  let onSpaceCascaderChange = (value, selectedOptions) => {
    setSelectedSpaceName(selectedOptions.map(o => o.label).join('/'));
    setSelectedSpaceID(value[value.length - 1]);
    setMeterList([]);
    setExportButtonHidden(true);
    setSubmitButtonDisabled(false);
  }
  let onReportingPeriodBeginsDatetimeChange = (newDateTime) => {
    setReportingPeriodBeginsDatetime(newDateTime);
  }

  let onReportingPeriodEndsDatetimeChange = (newDateTime) => {
    setReportingPeriodEndsDatetime(newDateTime);
  }

  var getValidReportingPeriodBeginsDatetimes = function (currentDate) {
    return currentDate.isBefore(moment(reportingPeriodEndsDatetime, 'MM/DD/YYYY, hh:mm:ss a'));
  }

  var getValidReportingPeriodEndsDatetimes = function (currentDate) {
    return currentDate.isAfter(moment(reportingPeriodBeginsDatetime, 'MM/DD/YYYY, hh:mm:ss a'));
  }

  // Handler
  const handleSubmit = e => {
    e.preventDefault();
    console.log('handleSubmit');
    console.log(selectedSpaceID);
    console.log(reportingPeriodBeginsDatetime.format('YYYY-MM-DDTHH:mm:ss'));
    console.log(reportingPeriodEndsDatetime.format('YYYY-MM-DDTHH:mm:ss'));

    // disable submit button
    setSubmitButtonDisabled(true);
    // show spinner
    setSpinnerHidden(false);
    // hide export button
    setExportButtonHidden(true)
 
    // Reinitialize tables
    setMeterList([]);
    
    let isResponseOK = false;
    fetch(APIBaseURL + '/reports/meterbatch?' +
      'spaceid=' + selectedSpaceID +
      '&reportingperiodstartdatetime=' + reportingPeriodBeginsDatetime.format('YYYY-MM-DDTHH:mm:ss') +
      '&reportingperiodenddatetime=' + reportingPeriodEndsDatetime.format('YYYY-MM-DDTHH:mm:ss'), {
      method: 'GET',
      headers: {
        "Content-type": "application/json",
        "User-UUID": getCookieValue('user_uuid'),
        "Token": getCookieValue('token')
      },
      body: null,

    }).then(response => {
      if (response.ok) {
        isResponseOK = true;
      };
      return response.json();
    }).then(json => {
      if (isResponseOK) {
        console.log(json)
        let meters = [];
        if (json['meters'].length > 0) {
          json['meters'].forEach((currentMeter, index) => {
            let detailed_value = {};
            detailed_value['id'] = currentMeter['id'];
            detailed_value['name'] = currentMeter['meter_name'];
            detailed_value['space'] = currentMeter['space_name'];
            detailed_value['costcenter'] = currentMeter['cost_center_name'];
            currentMeter['values'].forEach((currentValue, energyCategoryIndex) => {
              if (currentValue !== null) {
                detailed_value['a' + energyCategoryIndex] = currentValue;
              } else {
                detailed_value['a' + energyCategoryIndex] = null;
              }
              
            });
            meters.push(detailed_value);
          });
        };

        setMeterList(meters);

        let detailed_column_list = [];
        detailed_column_list.push({
          dataField: 'name',
          text: t('Name'),
          sort: true
        });
        detailed_column_list.push({
          dataField: 'space',
          text: t('Space'),
          sort: true
        });
        json['energycategories'].forEach((currentValue, index) => {
          detailed_column_list.push({
            dataField: 'a' + index,
            text: currentValue['name'] + ' (' + currentValue['unit_of_measure'] + ')',
            sort: true,
            formatter: function (decimalValue) {
              if (decimalValue !== null) {
                return decimalValue.toFixed(2);
              } else {
                return null;
              }
            }
          })
        });
        setDetailedDataTableColumns(detailed_column_list);

        setExcelBytesBase64(json['excel_bytes_base64']);

        // enable submit button
        setSubmitButtonDisabled(false);
        // hide spinner
        setSpinnerHidden(true);
        // show export button
        setExportButtonHidden(false);
          
      } else {
        toast.error(json.description)
      }
    }).catch(err => {
      console.log(err);
    });
  };

  const handleExport = e => {
    e.preventDefault();
    const mimeType='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
    const fileName = 'meterbatch.xlsx'
    var fileUrl = "data:" + mimeType + ";base64," + excelBytesBase64;
    fetch(fileUrl)
        .then(response => response.blob())
        .then(blob => {
            var link = window.document.createElement("a");
            link.href = window.URL.createObjectURL(blob, { type: mimeType });
            link.download = fileName;
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        });
  };
  


  return (
    <Fragment>
      <div>
        <Breadcrumb>
          <BreadcrumbItem>{t('Meter Data')}</BreadcrumbItem><BreadcrumbItem active>{t('Batch Analysis')}</BreadcrumbItem>
        </Breadcrumb>
      </div>
      <Card className="bg-light mb-3">
        <CardBody className="p-3">
          <Form onSubmit={handleSubmit}>
            <Row form>
              <Col xs={6} sm={3}>
                <FormGroup className="form-group">
                  <Label className={labelClasses} for="space">
                    {t('Space')}
                  </Label>
                  <br />
                  <Cascader options={cascaderOptions}
                    onChange={onSpaceCascaderChange}
                    changeOnSelect
                    expandTrigger="hover">
                    <Input value={selectedSpaceName || ''} readOnly />
                  </Cascader>
                </FormGroup>
              </Col>
              
              <Col xs={6} sm={3}>
                <FormGroup className="form-group">
                  <Label className={labelClasses} for="reportingPeriodBeginsDatetime">
                    {t('Reporting Period Begins')}
                  </Label>
                  <Datetime id='reportingPeriodBeginsDatetime'
                    value={reportingPeriodBeginsDatetime}
                    onChange={onReportingPeriodBeginsDatetimeChange}
                    isValidDate={getValidReportingPeriodBeginsDatetimes}
                    closeOnSelect={true} />
                </FormGroup>
              </Col>
              <Col xs={6} sm={3}>
                <FormGroup className="form-group">
                  <Label className={labelClasses} for="reportingPeriodEndsDatetime">
                    {t('Reporting Period Ends')}
                  </Label>
                  <Datetime id='reportingPeriodEndsDatetime'
                    value={reportingPeriodEndsDatetime}
                    onChange={onReportingPeriodEndsDatetimeChange}
                    isValidDate={getValidReportingPeriodEndsDatetimes}
                    closeOnSelect={true} />
                </FormGroup>
              </Col>
              <Col xs="auto">
                <FormGroup>
                  <br></br>
                  <ButtonGroup id="submit">
                    <Button color="success" disabled={submitButtonDisabled} >{t('Submit')}</Button>
                  </ButtonGroup>
                </FormGroup>
              </Col>
              <Col xs="auto">
                <FormGroup>
                  <br></br>
                  <Spinner color="primary" hidden={spinnerHidden}  />
                </FormGroup>
              </Col>
              <Col xs="auto">
                  <br></br>
                  <ButtonIcon icon="external-link-alt" transform="shrink-3 down-2" color="falcon-default" 
                  hidden={exportButtonHidden}
                  onClick={handleExport} >
                    {t('Export')}
                  </ButtonIcon>
              </Col>
            </Row>
          </Form>
        </CardBody>
      </Card>
      <DetailedDataTable data={meterList} title={t('Detailed Data')} columns={detailedDataTableColumns} pagesize={50} >
      </DetailedDataTable>

    </Fragment>
  );
};

export default withTranslation()(withRedirect(MeterBatch));