import {useEffect, useState} from 'react';
import cloneDeep from 'lodash/cloneDeep';
import isEqual from 'lodash/isEqual';
import trimStart from 'lodash/trimStart';

import {t} from 'sentry/locale';
import type {
  Organization,
  OrganizationSummary,
  SelectValue,
  TagCollection,
} from 'sentry/types';
import {
  aggregateFunctionOutputType,
  aggregateOutputType,
  getEquationAliasIndex,
  isEquation,
  isEquationAlias,
  isLegalYAxisType,
  SPAN_OP_BREAKDOWN_FIELDS,
  stripDerivedMetricsPrefix,
  stripEquationPrefix,
} from 'sentry/utils/discover/fields';
import type {MeasurementCollection} from 'sentry/utils/measurements/measurements';
import useApi from 'sentry/utils/useApi';
import useCustomMeasurements from 'sentry/utils/useCustomMeasurements';
import {getDatasetConfig} from 'sentry/views/dashboards/datasetConfig/base';
import type {Widget, WidgetQuery} from 'sentry/views/dashboards/types';
import {DisplayType, WidgetType} from 'sentry/views/dashboards/types';
import type {FieldValueOption} from 'sentry/views/discover/table/queryField';
import {FieldValueKind} from 'sentry/views/discover/table/types';
import {generateFieldOptions} from 'sentry/views/discover/utils';
import {IssueSortOptions} from 'sentry/views/issueList/utils';

import type {FlatValidationError, ValidationError} from '../utils';
import {getNumEquations} from '../utils';

import {DISABLED_SORT, TAG_SORT_DENY_LIST} from './releaseWidget/fields';

// Used in the widget builder to limit the number of lines plotted in the chart
export const DEFAULT_RESULTS_LIMIT = 5;
const RESULTS_LIMIT = 10;

// Both dashboards and widgets use the 'new' keyword when creating
export const NEW_DASHBOARD_ID = 'new';

export enum DataSet {
  EVENTS = 'events',
  ISSUES = 'issues',
  RELEASES = 'releases',
  METRICS = 'metrics',
}

export enum SortDirection {
  HIGH_TO_LOW = 'high_to_low',
  LOW_TO_HIGH = 'low_to_high',
}

export const sortDirections = {
  [SortDirection.HIGH_TO_LOW]: t('High to low'),
  [SortDirection.LOW_TO_HIGH]: t('Low to high'),
};

export const displayTypes = {
  [DisplayType.AREA]: t('Area Chart'),
  [DisplayType.BAR]: t('Bar Chart'),
  [DisplayType.LINE]: t('Line Chart'),
  [DisplayType.TABLE]: t('Table'),
  [DisplayType.BIG_NUMBER]: t('Big Number'),
};

export function mapErrors(
  data: ValidationError,
  update: FlatValidationError
): FlatValidationError {
  Object.keys(data).forEach((key: string) => {
    const value = data[key];
    if (typeof value === 'string') {
      update[key] = value;
      return;
    }
    // Recurse into nested objects.
    if (Array.isArray(value) && typeof value[0] === 'string') {
      update[key] = value[0];
      return;
    }
    if (Array.isArray(value) && typeof value[0] === 'object') {
      update[key] = (value as ValidationError[]).map(item => mapErrors(item, {}));
    } else {
      update[key] = mapErrors(value as ValidationError, {});
    }
  });

  return update;
}

export const generateOrderOptions = ({
  aggregates,
  columns,
  widgetType,
}: {
  aggregates: string[];
  columns: string[];
  widgetType: WidgetType;
}): SelectValue<string>[] => {
  const isRelease = widgetType === WidgetType.RELEASE;
  const options: SelectValue<string>[] = [];
  let equations = 0;
  (isRelease
    ? [...aggregates.map(stripDerivedMetricsPrefix), ...columns]
    : [...aggregates, ...columns]
  )
    .filter(field => !!field)
    .filter(field => !DISABLED_SORT.includes(field))
    .filter(field => (isRelease ? !TAG_SORT_DENY_LIST.includes(field) : true))
    .forEach(field => {
      let alias;
      const label = stripEquationPrefix(field);
      // Equations are referenced via a standard alias following this pattern
      if (isEquation(field)) {
        alias = `equation[${equations}]`;
        equations += 1;
      }

      options.push({label, value: alias ?? field});
    });

  return options;
};

export function normalizeQueries({
  displayType,
  queries,
  widgetType,
}: {
  displayType: DisplayType;
  queries: Widget['queries'];
  widgetType?: Widget['widgetType'];
}): Widget['queries'] {
  const isTimeseriesChart = getIsTimeseriesChart(displayType);
  const isTabularChart = [DisplayType.TABLE, DisplayType.TOP_N].includes(displayType);
  queries = cloneDeep(queries);

  if ([DisplayType.TABLE, DisplayType.BIG_NUMBER].includes(displayType)) {
    // Some display types may only support at most 1 query.
    queries = queries.slice(0, 1);
  } else if (isTimeseriesChart) {
    // Timeseries charts supports at most 3 queries.
    queries = queries.slice(0, 3);
  }

  queries = queries.map(query => {
    const {fields = [], columns} = query;

    if (isTabularChart) {
      // If the groupBy field has values, port everything over to the columnEditCollect field.
      query.fields = [...new Set([...fields, ...columns])];
    } else {
      // If columnEditCollect has field values , port everything over to the groupBy field.
      query.fields = fields.filter(field => !columns.includes(field));
    }

    if (
      getIsTimeseriesChart(displayType) &&
      !query.columns.filter(column => !!column).length
    ) {
      // The orderby is only applicable for timeseries charts when there's a
      // grouping selected, if all fields are empty then we also reset the orderby
      query.orderby = '';
      return query;
    }

    const queryOrderBy =
      widgetType === WidgetType.RELEASE
        ? stripDerivedMetricsPrefix(queries[0].orderby)
        : queries[0].orderby;
    const rawOrderBy = trimStart(queryOrderBy, '-');

    const resetOrderBy =
      // Raw Equation from Top N only applies to timeseries
      (isTabularChart && isEquation(rawOrderBy)) ||
      // Not contained as tag, field, or function
      (!isEquation(rawOrderBy) &&
        !isEquationAlias(rawOrderBy) &&
        ![...query.columns, ...query.aggregates].includes(rawOrderBy)) ||
      // Equation alias and not contained
      (isEquationAlias(rawOrderBy) &&
        getEquationAliasIndex(rawOrderBy) >
          getNumEquations([...query.columns, ...query.aggregates]) - 1);
    const orderBy =
      (!resetOrderBy && trimStart(queryOrderBy, '-')) ||
      (widgetType === WidgetType.ISSUE
        ? queryOrderBy ?? IssueSortOptions.DATE
        : generateOrderOptions({
            widgetType: widgetType ?? WidgetType.DISCOVER,
            columns: queries[0].columns,
            aggregates: queries[0].aggregates,
          })[0]?.value);

    if (!orderBy) {
      query.orderby = '';
      return query;
    }

    // A widget should be descending if:
    // - There is no orderby, so we're defaulting to desc
    // - Not an issues widget since issues doesn't support descending and
    //   the original ordering was descending
    const isDescending =
      !query.orderby || (widgetType !== WidgetType.ISSUE && queryOrderBy.startsWith('-'));

    query.orderby = isDescending ? `-${String(orderBy)}` : String(orderBy);

    return query;
  });

  if (isTabularChart) {
    return queries;
  }

  // Filter out non-aggregate fields
  queries = queries.map(query => {
    let aggregates = query.aggregates;

    if (isTimeseriesChart) {
      // Filter out fields that will not generate numeric output types
      aggregates = aggregates.filter(aggregate =>
        isLegalYAxisType(aggregateOutputType(aggregate))
      );
    }

    if (isTimeseriesChart && aggregates.length && aggregates.length > 3) {
      // Timeseries charts supports at most 3 fields.
      aggregates = aggregates.slice(0, 3);
    }

    return {
      ...query,
      fields: aggregates.length ? aggregates : ['count()'],
      columns: query.columns ? query.columns : [],
      aggregates: aggregates.length ? aggregates : ['count()'],
    };
  });

  if (isTimeseriesChart) {
    // For timeseries widget, all queries must share identical set of fields.

    const referenceAggregates = [...queries[0].aggregates];

    queryLoop: for (const query of queries) {
      if (referenceAggregates.length >= 3) {
        break;
      }

      if (isEqual(referenceAggregates, query.aggregates)) {
        continue;
      }

      for (const aggregate of query.aggregates) {
        if (referenceAggregates.length >= 3) {
          break queryLoop;
        }

        if (!referenceAggregates.includes(aggregate)) {
          referenceAggregates.push(aggregate);
        }
      }
    }

    queries = queries.map(query => {
      return {
        ...query,
        columns: query.columns ? query.columns : [],
        aggregates: referenceAggregates,
        fields: referenceAggregates,
      };
    });
  }

  if (DisplayType.BIG_NUMBER === displayType) {
    // For world map chart, cap fields of the queries to only one field.
    queries = queries.map(query => {
      return {
        ...query,
        fields: query.aggregates.slice(0, 1),
        aggregates: query.aggregates.slice(0, 1),
        orderby: '',
        columns: [],
      };
    });
  }

  return queries;
}

export function getParsedDefaultWidgetQuery(query = ''): WidgetQuery | undefined {
  // "any" was needed here because it doesn't pass in getsentry
  const urlSeachParams = new URLSearchParams(query) as any;
  const parsedQuery = Object.fromEntries(urlSeachParams.entries());

  if (!Object.keys(parsedQuery).length) {
    return undefined;
  }

  const columns = parsedQuery.columns ? getFields(parsedQuery.columns) : [];
  const aggregates = parsedQuery.aggregates ? getFields(parsedQuery.aggregates) : [];
  const fields = [...columns, ...aggregates];

  return {
    ...parsedQuery,
    fields,
    columns,
    aggregates,
  } as WidgetQuery;
}

export function getFields(fieldsString: string): string[] {
  // Use a negative lookahead to avoid splitting on commas inside equation fields
  return fieldsString.split(/,(?![^(]*\))/g);
}

export function getAmendedFieldOptions({
  measurements,
  organization,
  tags,
}: {
  measurements: MeasurementCollection;
  organization: OrganizationSummary;
  tags: TagCollection;
}) {
  return generateFieldOptions({
    organization,
    tagKeys: Object.values(tags).map(({key}) => key),
    measurementKeys: Object.values(measurements).map(({key}) => key),
    spanOperationBreakdownKeys: SPAN_OP_BREAKDOWN_FIELDS,
  });
}

// Extract metric names from aggregation functions present in the widget queries
export function getMetricFields(queries: WidgetQuery[]) {
  return queries.reduce<string[]>((acc, query) => {
    for (const field of [...query.aggregates, ...query.columns]) {
      const fieldParameter = /\(([^)]*)\)/.exec(field)?.[1];
      if (fieldParameter && !acc.includes(fieldParameter)) {
        acc.push(fieldParameter);
      }
    }

    return acc;
  }, []);
}

// Used to limit the number of results of the "filter your results" fields dropdown
export const MAX_SEARCH_ITEMS = 5;

// Used to set the max height of the smartSearchBar menu
export const MAX_MENU_HEIGHT = 250;

// Any function/field choice for Big Number widgets is legal since the
// data source is from an endpoint that is not timeseries-based.
// The function/field choice for World Map widget will need to be numeric-like.
// Column builder for Table widget is already handled above.
export function doNotValidateYAxis(displayType: DisplayType) {
  return displayType === DisplayType.BIG_NUMBER;
}

export function filterPrimaryOptions({
  option,
  widgetType,
  displayType,
}: {
  displayType: DisplayType;
  option: FieldValueOption;
  widgetType?: WidgetType;
}) {
  if (widgetType === WidgetType.RELEASE) {
    if (displayType === DisplayType.TABLE) {
      return [
        FieldValueKind.FUNCTION,
        FieldValueKind.FIELD,
        FieldValueKind.NUMERIC_METRICS,
      ].includes(option.value.kind);
    }
    if (displayType === DisplayType.TOP_N) {
      return option.value.kind === FieldValueKind.TAG;
    }
  }

  // Only validate function names for timeseries widgets and
  // world map widgets.
  if (!doNotValidateYAxis(displayType) && option.value.kind === FieldValueKind.FUNCTION) {
    const primaryOutput = aggregateFunctionOutputType(option.value.meta.name, undefined);
    if (primaryOutput) {
      // If a function returns a specific type, then validate it.
      return isLegalYAxisType(primaryOutput);
    }
  }

  return [FieldValueKind.FUNCTION, FieldValueKind.NUMERIC_METRICS].includes(
    option.value.kind
  );
}

export function getResultsLimit(numQueries: number, numYAxes: number) {
  if (numQueries === 0 || numYAxes === 0) {
    return DEFAULT_RESULTS_LIMIT;
  }

  return Math.floor(RESULTS_LIMIT / (numQueries * numYAxes));
}

export function getIsTimeseriesChart(displayType: DisplayType) {
  return [DisplayType.LINE, DisplayType.AREA, DisplayType.BAR].includes(displayType);
}

export const useTableFieldOptions = (
  organization: Organization,
  tags: TagCollection,
  widgetType?: WidgetType
) => {
  const {customMeasurements} = useCustomMeasurements();
  const api = useApi();

  const {getTableFieldOptions} = getDatasetConfig(widgetType);

  const [fieldOptions, setFieldOptions] = useState(
    getTableFieldOptions(organization, tags, customMeasurements, api)
  );

  useEffect(() => {
    const fetchTableFieldOptions = async () => {
      const options = await getTableFieldOptions(
        organization,
        tags,
        customMeasurements,
        api
      );
      setFieldOptions(options);
    };

    fetchTableFieldOptions();
  }, [api, organization, tags, customMeasurements, getTableFieldOptions]);

  return fieldOptions;
};

export const useGroupByOptions = (organization, tags, widgetType, queries) => {
  const [groupByOptions, setGroupByOptions] = useState<Record<string, any>>({});
  const {getGroupByFieldOptions} = getDatasetConfig(widgetType);
  const api = useApi();
  const {customMeasurements} = useCustomMeasurements();

  useEffect(() => {
    const fetchGroupByFieldOptions = async () => {
      if (getGroupByFieldOptions) {
        const options = await getGroupByFieldOptions(
          organization,
          tags,
          customMeasurements,
          api,
          queries
        );
        setGroupByOptions(options);
      } else {
        setGroupByOptions({});
      }
    };

    fetchGroupByFieldOptions();
  }, [api, organization, tags, customMeasurements, getGroupByFieldOptions, queries]);

  return groupByOptions;
};