import {
  DocumentTitle,
  K8sResourceCommon,
  k8sPatch,
  useK8sModel,
  useK8sWatchResource,
} from '@openshift-console/dynamic-plugin-sdk';

import {
  Alert,
  Card,
  CardBody,
  CardTitle,
  PageSection,
  Spinner,
  Switch,
  Title,
} from '@patternfly/react-core';

import type { FC } from 'react';
import { useState } from 'react';

import NowPlayingCard from './NowPlayingCard';
import GamingCard from './GamingCard';

const TUNED_NAMESPACE = 'openshift-cluster-node-tuning-operator';
const TUNED_NAME = 'custom-tuned-profile';

const POWERSAVE_PROFILE = 'homelab-powersave';
const PERFORMANCE_PROFILE = 'homelab-performance';

const TunedGVK = {
  group: 'tuned.openshift.io',
  version: 'v1',
  kind: 'Tuned',
};

interface TunedResource extends K8sResourceCommon {
  spec?: {
    recommend?: Array<{
      profile?: string;
      [key: string]: unknown;
    }>;
  };
}

const DashboardPage: FC = () => {
  const [patching, setPatching] = useState(false);
  const [patchError, setPatchError] = useState<string>();

  const [tunedModel, modelLoading] = useK8sModel(TunedGVK);

  const [tuned, loaded, loadError] =
    useK8sWatchResource<TunedResource>({
      groupVersionKind: TunedGVK,
      name: TUNED_NAME,
      namespace: TUNED_NAMESPACE,
    });

  const recommendations = tuned?.spec?.recommend ?? [];

  const profileIndex = recommendations.findIndex(
    (recommendation) =>
      recommendation.profile === POWERSAVE_PROFILE ||
      recommendation.profile === PERFORMANCE_PROFILE,
  );

  const currentProfile =
    profileIndex >= 0
      ? recommendations[profileIndex]?.profile
      : undefined;

  const performanceEnabled =
    currentProfile === PERFORMANCE_PROFILE;

  const profileKnown =
    currentProfile === POWERSAVE_PROFILE ||
    currentProfile === PERFORMANCE_PROFILE;

  const changePerformanceMode = async (enabled: boolean) => {
    if (!tunedModel || !tuned || profileIndex < 0) {
      return;
    }

    setPatching(true);
    setPatchError(undefined);

    try {
      await k8sPatch({
        model: tunedModel,
        resource: tuned,
        data: [
          {
            op: 'replace',
            path: `/spec/recommend/${profileIndex}/profile`,
            value: enabled
              ? PERFORMANCE_PROFILE
              : POWERSAVE_PROFILE,
          },
        ],
      });
    } catch (error) {
      setPatchError(
        error instanceof Error
          ? error.message
          : String(error),
      );
    } finally {
      setPatching(false);
    }
  };

  return (
    <>
      <DocumentTitle>Dashboard</DocumentTitle>

      <PageSection>
        <Title headingLevel="h1" size="2xl">
          Homelab Dashboard
        </Title>
      </PageSection>

      <PageSection>
        <Card>
          <CardTitle>Cluster performance</CardTitle>

          <CardBody>
            {!loaded || modelLoading ? (
              <Spinner />
            ) : loadError ? (
              <Alert
                isInline
                variant="danger"
                title="Unable to read TuneD configuration"
              >
                {String(loadError)}
              </Alert>
            ) : (
              <>
                <Switch
                  id="cluster-performance-mode"
                  label="Performance mode"
                  isChecked={performanceEnabled}
                  isDisabled={patching || !profileKnown}
                  onChange={(_, checked) =>
                    void changePerformanceMode(checked)
                  }
                /><br /><br />

                <p>
                  Current profile:{' '}
                  <strong>
                    {currentProfile ?? 'Unknown'}
                  </strong>
                </p>

                {patching && <Spinner size="md" />}

                {!profileKnown && (
                  <Alert
                    isInline
                    variant="warning"
                    title="Unknown TuneD profile"
                  >
                    Expected {POWERSAVE_PROFILE} or{' '}
                    {PERFORMANCE_PROFILE}.
                  </Alert>
                )}

                {patchError && (
                  <Alert
                    isInline
                    variant="danger"
                    title="Unable to change performance mode"
                  >
                    {patchError}
                  </Alert>
                )}
              </>
            )}
          </CardBody>
        </Card>
      </PageSection>

      <PageSection>
        <NowPlayingCard />
      </PageSection>
      
      <PageSection>
        <GamingCard />
      </PageSection>
    </>
  );
};

export default DashboardPage;