import {Component, Fragment} from 'react';
import styled from '@emotion/styled';
import {Observer} from 'mobx-react';

import FieldGroup from 'sentry/components/forms/fieldGroup';
import NumberField from 'sentry/components/forms/fields/numberField';
import SelectField from 'sentry/components/forms/fields/selectField';
import SentryProjectSelectorField from 'sentry/components/forms/fields/sentryProjectSelectorField';
import TextField from 'sentry/components/forms/fields/textField';
import Form, {FormProps} from 'sentry/components/forms/form';
import FormModel from 'sentry/components/forms/model';
import ExternalLink from 'sentry/components/links/externalLink';
import {Panel, PanelAlert, PanelBody, PanelHeader} from 'sentry/components/panels';
import TextCopyInput from 'sentry/components/textCopyInput';
import TimeSince from 'sentry/components/timeSince';
import {t, tct, tn} from 'sentry/locale';
import {PageFilters, Project, SelectValue} from 'sentry/types';
import commonTheme from 'sentry/utils/theme';
import withPageFilters from 'sentry/utils/withPageFilters';
import withProjects from 'sentry/utils/withProjects';

import {Monitor, MonitorConfig, MonitorTypes, ScheduleType} from './types';

const SCHEDULE_TYPES: SelectValue<ScheduleType>[] = [
  {value: 'crontab', label: 'Crontab'},
  {value: 'interval', label: 'Interval'},
];

const DEFAULT_MONITOR_TYPE = 'cron_job';

const getIntervals = (n: number): SelectValue<string>[] => [
  {value: 'minute', label: tn('minute', 'minutes', n)},
  {value: 'hour', label: tn('hour', 'hours', n)},
  {value: 'day', label: tn('day', 'days', n)},
  {value: 'week', label: tn('week', 'weeks', n)},
  {value: 'month', label: tn('month', 'months', n)},
  {value: 'year', label: tn('year', 'years', n)},
];

type Props = {
  apiEndpoint: string;
  apiMethod: FormProps['apiMethod'];
  onSubmitSuccess: FormProps['onSubmitSuccess'];
  projects: Project[];
  selection: PageFilters;
  monitor?: Monitor;
  submitLabel?: string;
};

type TransformedData = {
  config?: Partial<MonitorConfig>;
};

function transformData(_data: Record<string, any>, model: FormModel) {
  return model.fields.toJSON().reduce<TransformedData>((data, [k, v]) => {
    if (k.indexOf('config.') !== 0) {
      data[k] = v;
      return data;
    }

    if (!data.config) {
      data.config = {};
    }
    if (k === 'config.schedule.frequency' || k === 'config.schedule.interval') {
      if (!Array.isArray(data.config.schedule)) {
        data.config.schedule = [null, null];
      }
    }

    if (k === 'config.schedule.frequency') {
      data.config!.schedule![0] = parseInt(v as string, 10);
    } else if (k === 'config.schedule.interval') {
      data.config!.schedule![1] = v;
    } else {
      data.config[k.substr(7)] = v;
    }

    return data;
  }, {});
}

class MonitorForm extends Component<Props> {
  form = new FormModel({transformData});

  formDataFromConfig(type: MonitorTypes, config: MonitorConfig) {
    const rv = {};
    switch (type) {
      case 'cron_job':
        rv['config.schedule_type'] = config.schedule_type;
        rv['config.checkin_margin'] = config.checkin_margin;
        rv['config.max_runtime'] = config.max_runtime;

        switch (config.schedule_type) {
          case 'interval':
            rv['config.schedule.frequency'] = config.schedule[0];
            rv['config.schedule.interval'] = config.schedule[1];
            break;
          case 'crontab':
          default:
            rv['config.schedule'] = config.schedule;
        }
        break;
      default:
    }
    return rv;
  }

  render() {
    const {monitor, submitLabel} = this.props;
    const selectedProjectId = this.props.selection.projects[0];
    const selectedProject = selectedProjectId
      ? this.props.projects.find(p => p.id === selectedProjectId + '')
      : null;
    return (
      <Form
        allowUndo
        requireChanges
        apiEndpoint={this.props.apiEndpoint}
        apiMethod={this.props.apiMethod}
        model={this.form}
        initialData={
          monitor
            ? {
                name: monitor.name,
                type: monitor.type ?? DEFAULT_MONITOR_TYPE,
                project: monitor.project.slug,
                ...this.formDataFromConfig(monitor.type, monitor.config),
              }
            : {
                project: selectedProject ? selectedProject.slug : null,
                type: DEFAULT_MONITOR_TYPE,
              }
        }
        onSubmitSuccess={this.props.onSubmitSuccess}
        submitLabel={submitLabel}
      >
        <Panel>
          <PanelHeader>{t('Details')}</PanelHeader>

          <PanelBody>
            {monitor && (
              <FieldGroup label={t('ID')}>
                <div className="controls">
                  <TextCopyInput>{monitor.id}</TextCopyInput>
                </div>
              </FieldGroup>
            )}
            <SentryProjectSelectorField
              name="project"
              label={t('Project')}
              projects={this.props.projects.filter(project => project.isMember)}
              valueIsSlug
              help={t(
                "Select the project which contains the recurring job you'd like to monitor."
              )}
              required
            />
            <TextField
              name="name"
              placeholder={t('My Cron Job')}
              label={t('Name your cron monitor')}
              required
            />
          </PanelBody>
        </Panel>
        <Panel>
          <PanelHeader>{t('Config')}</PanelHeader>

          <PanelBody>
            {monitor !== undefined && (
              <PanelAlert type="info">
                {tct(
                  'Any changes you make to the execution schedule will only be applied after the next expected check-in [nextCheckin].',
                  {
                    nextCheckin: (
                      <strong>
                        <TimeSince date={monitor.nextCheckIn} />
                      </strong>
                    ),
                  }
                )}
              </PanelAlert>
            )}
            <NumberField
              name="config.max_runtime"
              label={t('Max Runtime')}
              help={t(
                "Set the number of minutes a recurring job is allowed to run before it's considered failed"
              )}
              placeholder="e.g. 30"
            />
            <SelectField
              name="config.schedule_type"
              label={t('Schedule Type')}
              options={SCHEDULE_TYPES}
              required
            />
            <Observer>
              {() => {
                switch (this.form.getValue('config.schedule_type')) {
                  case 'crontab':
                    return (
                      <Fragment>
                        <TextField
                          name="config.schedule"
                          label={t('Schedule')}
                          placeholder="*/5 * * * *"
                          required
                          help={tct(
                            'Any schedule changes will be applied to the next check-in. See [link:Wikipedia] for crontab syntax.',
                            {
                              link: (
                                <ExternalLink href="https://en.wikipedia.org/wiki/Cron" />
                              ),
                            }
                          )}
                          css={{input: {fontFamily: commonTheme.text.familyMono}}}
                        />
                        <NumberField
                          name="config.checkin_margin"
                          label={t('Check-in Margin')}
                          help={t(
                            "The max error margin (in minutes) before a check-in is considered missed. If you don't expect your job to start immediately at the scheduled time, expand this margin to account for delays."
                          )}
                          placeholder="e.g. 30"
                        />
                      </Fragment>
                    );
                  case 'interval':
                    return (
                      <Fragment>
                        <CombinedField>
                          <FieldGroup
                            label={t('Frequency')}
                            help={t(
                              'The amount of time between each job execution. Example, every 5 hours.'
                            )}
                            stacked
                            required
                          />
                          <StyledNumberField
                            name="config.schedule.frequency"
                            label={t('Frequency')}
                            placeholder="e.g. 1"
                            hideLabel
                            required
                          />
                          <StyledSelectField
                            name="config.schedule.interval"
                            label={t('Interval')}
                            options={getIntervals(
                              Number(this.form.getValue('config.schedule.frequency') ?? 1)
                            )}
                            hideLabel
                            required
                          />
                        </CombinedField>
                        <NumberField
                          name="config.checkin_margin"
                          label={t('Check-in Margin')}
                          help={t(
                            "The max error margin (in minutes) before a check-in is considered missed. If you don't expect your job to start immediately at the scheduled time, expand this margin to account for delays."
                          )}
                          placeholder="e.g. 30"
                        />
                      </Fragment>
                    );
                  default:
                    return null;
                }
              }}
            </Observer>
          </PanelBody>
        </Panel>
      </Form>
    );
  }
}

const CombinedField = styled('div')`
  display: grid;
  grid-template-columns: 50% 1fr 1fr;
  align-items: center;
  border-bottom: 1px solid ${p => p.theme.innerBorder};
`;

const StyledNumberField = styled(NumberField)`
  padding: 0;
  border-bottom: none;
`;

const StyledSelectField = styled(SelectField)`
  padding-left: 0;
`;

export default withPageFilters(withProjects(MonitorForm));