import { FieldColorModeId, getFrameDisplayName } from '@grafana/data';
import { locationService } from '@grafana/runtime';
import {
  SceneFlexLayout,
  SceneByFrameRepeater,
  SceneTimePicker,
  VizPanel,
  EmbeddedScene,
  SceneDataNode,
  SceneTimeRange,
  VariableValueSelectors,
  SceneQueryRunner,
  SceneVariableSet,
  QueryVariable,
  SceneControlsSpacer,
  SceneDataTransformer,
  SceneRefreshPicker,
  SceneFlexItem,
} from '@grafana/scenes';
import { PromQuery } from 'app/plugins/datasource/prometheus/types';

import { SceneRadioToggle } from './SceneRadioToggle';
import { SceneSearchBox } from './SceneSearchBox';
import { getTableFilterTransform, getTimeSeriesFilterTransform } from './transforms';
import { getLinkUrlWithAppUrlState } from './utils';

export function getHttpHandlerListScene(): EmbeddedScene {
  const searchBox = new SceneSearchBox({ value: '' });

  const httpHandlerQueries = getInstantQuery({
    expr: 'sort_desc(avg without(job, instance) (rate(grafana_http_request_duration_seconds_sum[$__rate_interval]) * 1e3)) ',
  });

  const httpHandlerQueriesFiltered = new SceneDataTransformer({
    $data: httpHandlerQueries,
    transformations: [getTableFilterTransform('')],
  });

  httpHandlerQueriesFiltered.addActivationHandler(() => {
    const sub = searchBox.subscribeToState((state) => {
      // Update transform and re-process them
      httpHandlerQueriesFiltered.setState({ transformations: [getTableFilterTransform(state.value)] });
      httpHandlerQueriesFiltered.reprocessTransformations();
    });

    return () => sub.unsubscribe();
  });

  const httpHandlersTable = new VizPanel({
    $data: httpHandlerQueriesFiltered,
    pluginId: 'table',
    title: '',
    options: {
      footer: {
        enablePagination: true,
      },
    },
    fieldConfig: {
      defaults: {},
      overrides: [
        {
          matcher: {
            id: 'byRegexp',
            options: '.*',
          },
          properties: [{ id: 'filterable', value: false }],
        },
        {
          matcher: {
            id: 'byName',
            options: 'Time',
          },
          properties: [{ id: 'custom.hidden', value: true }],
        },
        {
          matcher: {
            id: 'byName',
            options: 'Value',
          },
          properties: [{ id: 'displayName', value: 'Duration (Avg)' }],
        },
        {
          matcher: {
            id: 'byName',
            options: 'handler',
          },
          properties: [
            {
              id: 'links',
              value: [
                {
                  title: 'Go to handler drilldown view',
                  onBuildUrl: () => {
                    const params = locationService.getSearchObject();
                    return getLinkUrlWithAppUrlState(
                      '/scenes/grafana-monitoring/handlers/${__value.text:percentencode}',
                      params
                    );
                  },
                },
              ],
            },
          ],
        },
      ],
    },
  });

  const reqDurationTimeSeries = new SceneQueryRunner({
    datasource: { uid: 'gdev-prometheus' },
    queries: [
      {
        refId: 'A',
        //expr: ``,
        expr: 'topk(20, avg without(job, instance) (rate(grafana_http_request_duration_seconds_sum[$__rate_interval])) * 1e3)',
        range: true,
        format: 'time_series',
        legendFormat: '{{method}} {{handler}} (status = {{status_code}})',
        maxDataPoints: 500,
      },
    ],
  });

  const reqDurationTimeSeriesFiltered = new SceneDataTransformer({
    $data: reqDurationTimeSeries,
    transformations: [getTimeSeriesFilterTransform('')],
  });

  reqDurationTimeSeriesFiltered.addActivationHandler(() => {
    const sub = searchBox.subscribeToState((state) => {
      // Update transform and re-process them
      reqDurationTimeSeriesFiltered.setState({ transformations: [getTimeSeriesFilterTransform(state.value)] });
      reqDurationTimeSeriesFiltered.reprocessTransformations();
    });

    return () => sub.unsubscribe();
  });

  const graphsScene = new SceneByFrameRepeater({
    $data: reqDurationTimeSeriesFiltered,
    body: new SceneFlexLayout({
      direction: 'column',
      children: [],
    }),
    getLayoutChild: (data, frame, frameIndex) => {
      return new SceneFlexItem({
        key: `panel-${frameIndex}`,
        minHeight: 200,
        $data: new SceneDataNode({
          data: {
            ...data,
            series: [frame],
          },
        }),
        body: new SceneFlexLayout({
          direction: 'row',
          children: [
            new SceneFlexItem({
              body: new VizPanel({
                pluginId: 'timeseries',
                // titleLink: {
                //   path: `/scenes/grafana-monitoring/handlers/${encodeURIComponent(frame.fields[1].labels.handler)}`,
                //   queryKeys: ['from', 'to', 'var-instance'],
                // },
                title: getFrameDisplayName(frame),
                options: {
                  legend: { displayMode: 'hidden' },
                },
              }),
            }),

            new SceneFlexItem({
              width: 200,
              body: new VizPanel({
                title: 'Last',
                pluginId: 'stat',
                fieldConfig: {
                  defaults: {
                    displayName: 'Last',
                    links: [
                      {
                        title: 'Go to handler drilldown view',
                        url: ``,
                        onBuildUrl: () => {
                          const params = locationService.getSearchObject();
                          return getLinkUrlWithAppUrlState(
                            '/scenes/grafana-monitoring/handlers/${__field.labels.handler:percentencode}',
                            params
                          );
                        },
                      },
                    ],
                  },
                  overrides: [],
                },
                options: {
                  graphMode: 'none',
                  textMode: 'value',
                },
              }),
            }),
          ],
        }),
      });
    },
  });

  const layout = new SceneFlexLayout({
    children: [new SceneFlexItem({ body: httpHandlersTable })],
  });

  const sceneToggle = new SceneRadioToggle({
    options: [
      { value: 'table', label: 'Table' },
      { value: 'graphs', label: 'Graphs' },
    ],
    value: 'table',
    onChange: (value) => {
      if (value === 'table') {
        layout.setState({ children: [new SceneFlexItem({ body: httpHandlersTable })] });
      } else {
        layout.setState({ children: [graphsScene] });
      }
    },
  });

  const scene = new EmbeddedScene({
    $variables: getVariablesDefinitions(),
    $data: httpHandlerQueries,
    $timeRange: new SceneTimeRange({ from: 'now-1h', to: 'now' }),
    controls: [
      new VariableValueSelectors({}),
      searchBox,
      new SceneControlsSpacer(),
      sceneToggle,
      new SceneTimePicker({ isOnCanvas: true }),
      new SceneRefreshPicker({ isOnCanvas: true }),
    ],
    body: layout,
  });

  return scene;
}

export function getHandlerDetailsScene(handler: string): EmbeddedScene {
  const reqDurationTimeSeries = getTimeSeriesQuery({
    expr: `avg without(job, instance) (rate(grafana_http_request_duration_seconds_sum{handler="${handler}"}[$__rate_interval])) * 1e3`,
    legendFormat: '{{method}} {{handler}} (status = {{status_code}})',
  });

  const reqCountTimeSeries = getTimeSeriesQuery({
    expr: `sum without(job, instance) (rate(grafana_http_request_duration_seconds_count{handler="${handler}"}[$__rate_interval])) `,
    legendFormat: '{{method}} {{handler}} (status = {{status_code}})',
  });

  const scene = new EmbeddedScene({
    $variables: getVariablesDefinitions(),
    $timeRange: new SceneTimeRange({ from: 'now-1h', to: 'now' }),
    controls: [
      new VariableValueSelectors({}),
      new SceneControlsSpacer(),
      new SceneTimePicker({ isOnCanvas: true }),
      new SceneRefreshPicker({ isOnCanvas: true }),
    ],
    body: new SceneFlexLayout({
      direction: 'column',
      children: [
        new SceneFlexItem({
          body: new VizPanel({
            $data: reqDurationTimeSeries,
            pluginId: 'timeseries',
            title: 'Request duration avg (ms)',
            //displayMode: 'transparent',
            options: {},
          }),
        }),
        new SceneFlexItem({
          body: new VizPanel({
            $data: reqCountTimeSeries,
            pluginId: 'timeseries',
            title: 'Request count/s',
            //displayMode: 'transparent',
            options: {},
          }),
        }),
      ],
    }),
  });

  return scene;
}

function getInstantQuery(query: Partial<PromQuery>): SceneQueryRunner {
  return new SceneQueryRunner({
    datasource: { uid: 'gdev-prometheus' },
    queries: [
      {
        refId: 'A',
        instant: true,
        format: 'table',
        maxDataPoints: 500,
        ...query,
      },
    ],
  });
}

function getTimeSeriesQuery(query: Partial<PromQuery>): SceneQueryRunner {
  return new SceneQueryRunner({
    datasource: { uid: 'gdev-prometheus' },
    queries: [
      {
        refId: 'A',
        range: true,
        format: 'time_series',
        maxDataPoints: 500,
        ...query,
      },
    ],
  });
}

export function getOverviewScene(): EmbeddedScene {
  const scene = new EmbeddedScene({
    $variables: getVariablesDefinitions(),
    $timeRange: new SceneTimeRange({ from: 'now-1h', to: 'now' }),
    controls: [
      new VariableValueSelectors({}),
      new SceneControlsSpacer(),
      new SceneTimePicker({ isOnCanvas: true }),
      new SceneRefreshPicker({ isOnCanvas: true }),
    ],
    body: new SceneFlexLayout({
      direction: 'column',
      children: [
        new SceneFlexItem({
          height: 150,
          body: new SceneFlexLayout({
            children: [
              new SceneFlexItem({
                body: getInstantStatPanel('grafana_stat_totals_dashboard', 'Dashboards'),
              }),
              new SceneFlexItem({
                body: getInstantStatPanel('grafana_stat_total_users', 'Users'),
              }),
              new SceneFlexItem({
                body: getInstantStatPanel('sum(grafana_stat_totals_datasource)', 'Data sources'),
              }),
              new SceneFlexItem({
                body: getInstantStatPanel('grafana_stat_total_service_account_tokens', 'Service account tokens'),
              }),
            ],
          }),
        }),

        new SceneFlexItem({
          body: new VizPanel({
            $data: new SceneQueryRunner({
              datasource: { uid: 'gdev-prometheus' },
              queries: [
                {
                  refId: 'A',
                  expr: `sum(process_resident_memory_bytes{job="grafana", instance=~"$instance"})`,
                  range: true,
                  format: 'time_series',
                  maxDataPoints: 500,
                },
              ],
            }),
            pluginId: 'timeseries',
            title: 'Memory usage',
            options: {
              legend: {
                showLegend: false,
              },
            },
            fieldConfig: {
              defaults: {
                unit: 'bytes',
                min: 0,
                custom: {
                  lineWidth: 2,
                  fillOpacity: 6,
                  //gradientMode: 'opacity',
                },
              },
              overrides: [],
            },
          }),
        }),
        new SceneFlexItem({
          body: new VizPanel({
            $data: new SceneQueryRunner({
              datasource: { uid: 'gdev-prometheus' },
              queries: [
                {
                  refId: 'A',
                  expr: `sum(go_goroutines{job="grafana", instance=~"$instance"})`,
                  range: true,
                  format: 'time_series',
                  maxDataPoints: 500,
                },
              ],
            }),
            pluginId: 'timeseries',
            title: 'Go routines',
            options: {
              legend: {
                showLegend: false,
              },
            },
            fieldConfig: {
              defaults: {
                min: 0,
                custom: {
                  lineWidth: 2,
                  fillOpacity: 6,
                  //gradientMode: 'opacity',
                },
              },
              overrides: [],
            },
          }),
        }),
      ],
    }),
  });

  return scene;
}

function getVariablesDefinitions() {
  return new SceneVariableSet({
    variables: [
      new QueryVariable({
        name: 'instance',
        datasource: { uid: 'gdev-prometheus' },
        query: { query: 'label_values(grafana_http_request_duration_seconds_sum, instance)' },
      }),
    ],
  });
}

function getInstantStatPanel(query: string, title: string) {
  return new VizPanel({
    $data: getInstantQuery({ expr: query }),
    pluginId: 'stat',
    title,
    options: {},
    fieldConfig: {
      defaults: {
        color: { fixedColor: 'text', mode: FieldColorModeId.Fixed },
      },
      overrides: [],
    },
  });
}

export function getHandlerLogsScene(handler: string): EmbeddedScene {
  const logsQuery = new SceneQueryRunner({
    datasource: { uid: 'gdev-loki' },
    queries: [
      {
        refId: 'A',
        expr: `{job="grafana"} | logfmt | handler=\`${handler}\` | __error__=\`\``,
        queryType: 'range',
        maxDataPoints: 5000,
      },
    ],
  });

  const scene = new EmbeddedScene({
    $variables: getVariablesDefinitions(),
    $timeRange: new SceneTimeRange({ from: 'now-1h', to: 'now' }),
    controls: [
      new VariableValueSelectors({}),
      new SceneControlsSpacer(),
      new SceneTimePicker({ isOnCanvas: true }),
      new SceneRefreshPicker({ isOnCanvas: true }),
    ],
    body: new SceneFlexLayout({
      direction: 'column',
      children: [
        new SceneFlexItem({
          body: new VizPanel({
            pluginId: 'text',
            title: '',
            options: {
              mode: 'markdown',
              content: `
  [mupp](/scenes/grafana-monitoring/handlers/${encodeURIComponent(handler)}/logs/mupp)
  [mapp](/scenes/grafana-monitoring/handlers/${encodeURIComponent(handler)}/logs/mapp)
  `,
            },
          }),
        }),
        new SceneFlexItem({
          body: new VizPanel({
            $data: logsQuery,
            pluginId: 'logs',
            title: '',
            options: {
              showTime: true,
              showLabels: false,
              showCommonLabels: false,
              wrapLogMessage: true,
              prettifyLogMessage: false,
              enableLogDetails: true,
              dedupStrategy: 'none',
              sortOrder: 'Descending',
            },
          }),
        }),
      ],
    }),
  });

  return scene;
}

export function getOverviewLogsScene(): EmbeddedScene {
  const logsQuery = new SceneQueryRunner({
    datasource: { uid: 'gdev-loki' },
    queries: [
      {
        refId: 'A',
        expr: `{job="grafana"} | logfmt | __error__=\`\``,
        queryType: 'range',
        maxDataPoints: 5000,
      },
    ],
  });

  const scene = new EmbeddedScene({
    $variables: getVariablesDefinitions(),
    $timeRange: new SceneTimeRange({ from: 'now-1h', to: 'now' }),
    controls: [
      new VariableValueSelectors({}),
      new SceneControlsSpacer(),
      new SceneTimePicker({ isOnCanvas: true }),
      new SceneRefreshPicker({ isOnCanvas: true }),
    ],
    body: new SceneFlexLayout({
      direction: 'column',
      children: [
        new SceneFlexItem({
          body: new VizPanel({
            $data: logsQuery,
            pluginId: 'logs',
            title: '',
            options: {
              showTime: true,
              showLabels: false,
              showCommonLabels: false,
              wrapLogMessage: true,
              prettifyLogMessage: false,
              enableLogDetails: true,
              dedupStrategy: 'none',
              sortOrder: 'Descending',
            },
          }),
        }),
      ],
    }),
  });

  return scene;
}