import React, { Fragment, useEffect, useState } from 'react';
import {
  Breadcrumb,
  BreadcrumbItem,
  Row,
  Col,
  Card,
  CardBody,
  Button,
  ButtonGroup,
  Form,
  FormGroup,
  Input,
  Label,
  CustomInput,
  Spinner,
} from 'reactstrap';
import Cascader from 'rc-cascader';
import moment from 'moment';
import loadable from '@loadable/component';
import LineChart from '../common/LineChart';
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';
import { DateRangePicker } from 'rsuite';
import { endOfDay} from 'date-fns';

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

const MeterTrend = ({ 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 From
  const [selectedSpaceName, setSelectedSpaceName] = useState(undefined);
  const [selectedSpaceID, setSelectedSpaceID] = useState(undefined);
  const [meterList, setMeterList] = useState([]);
  const [filteredMeterList, setFilteredMeterList] = useState([]);
  const [selectedMeter, setSelectedMeter] = useState(undefined);
  const [cascaderOptions, setCascaderOptions] = useState(undefined);
  const [reportingPeriodDateRange, setReportingPeriodDateRange] = useState([current_moment.clone().startOf('month').toDate(), current_moment.toDate()]);
  const dateRangePickerLocale = {
    sunday: t('sunday'),
    monday: t('monday'),
    tuesday: t('tuesday'),
    wednesday: t('wednesday'),
    thursday: t('thursday'),
    friday: t('friday'),
    saturday: t('saturday'),
    ok: t('ok'),
    today: t('today'),
    yesterday: t('yesterday'),
    hours: t('hours'),
    minutes: t('minutes'),
    seconds: t('seconds'),
    last7Days: t('last7Days')
  };
  const dateRangePickerStyle = { display: 'block', zIndex: 10};

  // buttons
  const [submitButtonDisabled, setSubmitButtonDisabled] = useState(true);
  const [spinnerHidden, setSpinnerHidden] = useState(true);
  const [exportButtonHidden, setExportButtonHidden] = useState(true);

  //Results
  const [meterLineChartOptions, setMeterLineChartOptions] = useState([]);
  const [meterLineChartData, setMeterLineChartData] = useState({});
  const [meterLineChartLabels, setMeterLineChartLabels] = useState([]);
  const [parameterLineChartOptions, setParameterLineChartOptions] = useState([]);
  const [parameterLineChartData, setParameterLineChartData] = useState({});
  const [parameterLineChartLabels, setParameterLineChartLabels] = useState([]);
  const [detailedDataTableColumns, setDetailedDataTableColumns] = useState([{dataField: 'startdatetime', text: t('Datetime'), sort: true}]);
  const [detailedDataTableData, setDetailedDataTableData] = useState([]);
  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);
        setSelectedSpaceName([json[0]].map(o => o.label));
        setSelectedSpaceID([json[0]].map(o => o.value));
        // get Meters by root Space ID
        let isResponseOK = false;
        fetch(APIBaseURL + '/spaces/' + [json[0]].map(o => o.value) + '/meters', {
          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) {
            json = JSON.parse(JSON.stringify([json]).split('"id":').join('"value":').split('"name":').join('"label":'));
            console.log(json);
            setMeterList(json[0]);
            setFilteredMeterList(json[0]);
            if (json[0].length > 0) {
              setSelectedMeter(json[0][0].value);
              // enable submit button
              setSubmitButtonDisabled(false);
            } else {
              setSelectedMeter(undefined);
              // disable submit button
              setSubmitButtonDisabled(true);
            }
          } else {
            toast.error(json.description)
          }
        }).catch(err => {
          console.log(err);
        });
        // end of get Meters by root Space ID
      } 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]);

    let isResponseOK = false;
    fetch(APIBaseURL + '/spaces/' + value[value.length - 1] + '/meters', {
      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) {
        json = JSON.parse(JSON.stringify([json]).split('"id":').join('"value":').split('"name":').join('"label":'));
        console.log(json)
        setMeterList(json[0]);
        setFilteredMeterList(json[0]);
        if (json[0].length > 0) {
          setSelectedMeter(json[0][0].value);
          // enable submit button
          setSubmitButtonDisabled(false);
        } else {
          setSelectedMeter(undefined);
          // disable submit button
          setSubmitButtonDisabled(true);
        }
      } else {
        toast.error(json.description)
      }
    }).catch(err => {
      console.log(err);
    });
  };
  
  const onSearchMeter = ({ target }) => {
    const keyword = target.value.toLowerCase();
    const filteredResult = meterList.filter(
      meter => meter.label.toLowerCase().includes(keyword)
    );
    setFilteredMeterList(keyword.length ? filteredResult : meterList);
    if (filteredResult.length > 0) {
      setSelectedMeter(filteredResult[0].value);
      // enable submit button
      setSubmitButtonDisabled(false);
    } else {
      setSelectedMeter(undefined);
      // disable submit button
      setSubmitButtonDisabled(true);
    };
    let customInputTarget = document.getElementById("meterSelect");
    customInputTarget.value = filteredResult[0].value
  };

  let onReportingPeriodChange = (DateRange) => {
    if(DateRange == null) {
      setReportingPeriodDateRange([null, null]);
    } else {
      if (moment(DateRange[1]).format('HH:mm:ss') == '00:00:00') {
        // if the user did not change time value, set the default time to the end of day
        DateRange[1] = endOfDay(DateRange[1]);
      }
      setReportingPeriodDateRange([DateRange[0], DateRange[1]]);
    }
  };

  let onReportingPeriodClean = event => {
    setReportingPeriodDateRange([null, null]);
  };
  
  // Handler
  const handleSubmit = e => {
    e.preventDefault();
    console.log('handleSubmit');
    console.log(selectedSpaceID);
    console.log(selectedMeter);
    console.log(moment(reportingPeriodDateRange[0]).format('YYYY-MM-DDTHH:mm:ss'))
    console.log(moment(reportingPeriodDateRange[1]).format('YYYY-MM-DDTHH:mm:ss'));

    // disable submit button
    setSubmitButtonDisabled(true); 
    // show spinner
    setSpinnerHidden(false);
    // hide export button
    setExportButtonHidden(true) 

    // Reinitialize tables
    setDetailedDataTableData([]);

    let isResponseOK = false;
    fetch(APIBaseURL + '/reports/metertrend?' +
      'meterid=' + selectedMeter +
      '&reportingperiodstartdatetime=' + moment(reportingPeriodDateRange[0]).format('YYYY-MM-DDTHH:mm:ss') +
      '&reportingperiodenddatetime=' + moment(reportingPeriodDateRange[1]).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 names = Array();
        json['reporting_period']['names'].forEach((currentValue, index) => {
          names.push({ 'value': 'a' + index, 'label': currentValue });
        });
        setMeterLineChartOptions(names);

        let timestamps =  {}
        json['reporting_period']['timestamps'].forEach((currentValue, index) => {
          timestamps['a' + index] = currentValue;
        });
        setMeterLineChartLabels(timestamps);

        let values = {};
        json['reporting_period']['values'].forEach((currentValue, index) => {
          values['a'+index] = currentValue
        });
        setMeterLineChartData(values)

        names = Array();
        json['parameters']['names'].forEach((currentValue, index) => {
          names.push({ 'value': 'a' + index, 'label': currentValue });
        });
        setParameterLineChartOptions(names);
        
        timestamps = {}
        json['parameters']['timestamps'].forEach((currentValue, index) => {
          timestamps['a' + index] = currentValue;
        });
        setParameterLineChartLabels(timestamps);

        values = {}
        json['parameters']['values'].forEach((currentValue, index) => {
          values['a' + index] = currentValue;
        });
        setParameterLineChartData(values);

        let columns = [{
          dataField: 'startdatetime',
          text: t('Datetime'),
          sort: true
        }];
        json['reporting_period']['names'].forEach((currentValue, index) => {
          let column = {};
          column['dataField'] = 'a' + index;
          column['text'] = currentValue;
          column['sort'] = true;
          columns.push(column);
        });
        setDetailedDataTableColumns(columns);

        let detial_value_list = [];
        // choose the first point's timestamps for all points
        if (json['reporting_period']['timestamps'].length > 0) {
          json['reporting_period']['timestamps'][0].forEach((currentValue, index) => {
            let detial_value = {};
            detial_value['id'] = index;
            detial_value['startdatetime'] = currentValue;
            json['reporting_period']['names'].forEach((currentValue1, index1) => {
              detial_value['a' + index1] = json['reporting_period']['values'][index1][index];
            });
            detial_value_list.push(detial_value);
          });
        };
        setDetailedDataTableData(detial_value_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 = 'metertrend.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('Meter Trend')}</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="auto">
                <FormGroup>
                  <Label className={labelClasses} for="meterSelect">
                    {t('Meter')}
                  </Label>
                  <Form inline>
                      <Input placeholder={t('Search')} onChange={onSearchMeter} />
                      <CustomInput type="select" id="meterSelect" name="meterSelect" onChange={({ target }) => setSelectedMeter(target.value)}
                      >
                        {filteredMeterList.map((meter, index) => (
                          <option value={meter.value} key={meter.value}>
                            {meter.label}
                          </option>
                        ))}
                      </CustomInput>
                  </Form>
                </FormGroup>
              </Col>
              <Col xs={6} sm={3}>
                <FormGroup className="form-group">
                  <Label className={labelClasses} for="reportingPeriodDateRangePicker">{t('Reporting Period')}</Label>
                  <br/>
                  <DateRangePicker
                    id='reportingPeriodDateRangePicker'
                    format="yyyy-MM-dd HH:mm:ss"
                    value={reportingPeriodDateRange}
                    onChange={onReportingPeriodChange}
                    size="md"
                    style={dateRangePickerStyle}
                    onClean={onReportingPeriodClean}
                    locale={dateRangePickerLocale}
                    placeholder={t("Select Date Range")}
                  />
                </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>

      <LineChart reportingTitle={t('Trend Values')}
        baseTitle
        labels={meterLineChartLabels}
        data={meterLineChartData}
        options={meterLineChartOptions}>
      </LineChart>

      <LineChart reportingTitle={t('Related Parameters')}
        baseTitle=''
        labels={parameterLineChartLabels}
        data={parameterLineChartData}
        options={parameterLineChartOptions}>
      </LineChart>
      <br />
      <DetailedDataTable data={detailedDataTableData} title={t('Detailed Data')} columns={detailedDataTableColumns} pagesize={50} >
      </DetailedDataTable>

    </Fragment>
  );
};

export default withTranslation()(withRedirect(MeterTrend));