import { DataFrame, FieldType } from '@grafana/data';
import { transform } from './result_transformer';

jest.mock('@grafana/runtime', () => ({
  getTemplateSrv: () => ({
    replace: (str: string) => str,
  }),
  getDataSourceSrv: () => {
    return {
      getInstanceSettings: () => {
        return { name: 'Tempo' };
      },
    };
  },
}));

const matrixResponse = {
  status: 'success',
  data: {
    resultType: 'matrix',
    result: [
      {
        metric: { __name__: 'test', job: 'testjob' },
        values: [
          [1, '10'],
          [2, '0'],
        ],
      },
    ],
  },
};

describe('Prometheus Result Transformer', () => {
  const options: any = { target: {}, query: {} };
  describe('When nothing is returned', () => {
    it('should return empty array', () => {
      const response = {
        status: 'success',
        data: {
          resultType: '',
          result: null,
        },
      };
      const series = transform({ data: response } as any, options);
      expect(series).toEqual([]);
    });
    it('should return empty array', () => {
      const response = {
        status: 'success',
        data: {
          resultType: '',
          result: null,
        },
      };
      const result = transform({ data: response } as any, { ...options, target: { format: 'table' } });
      expect(result).toHaveLength(0);
    });
  });

  describe('When resultFormat is table', () => {
    const response = {
      status: 'success',
      data: {
        resultType: 'matrix',
        result: [
          {
            metric: { __name__: 'test', job: 'testjob' },
            values: [
              [1443454528, '3846'],
              [1443454530, '3848'],
            ],
          },
          {
            metric: {
              __name__: 'test2',
              instance: 'localhost:8080',
              job: 'otherjob',
            },
            values: [
              [1443454529, '3847'],
              [1443454531, '3849'],
            ],
          },
        ],
      },
    };

    it('should return data frame', () => {
      const result = transform({ data: response } as any, {
        ...options,
        target: {
          responseListLength: 0,
          refId: 'A',
          format: 'table',
        },
      });
      expect(result[0].fields[0].values.toArray()).toEqual([
        1443454528000,
        1443454530000,
        1443454529000,
        1443454531000,
      ]);
      expect(result[0].fields[0].name).toBe('Time');
      expect(result[0].fields[0].type).toBe(FieldType.time);
      expect(result[0].fields[1].values.toArray()).toEqual(['test', 'test', 'test2', 'test2']);
      expect(result[0].fields[1].name).toBe('__name__');
      expect(result[0].fields[1].config.filterable).toBe(true);
      expect(result[0].fields[1].type).toBe(FieldType.string);
      expect(result[0].fields[2].values.toArray()).toEqual(['', '', 'localhost:8080', 'localhost:8080']);
      expect(result[0].fields[2].name).toBe('instance');
      expect(result[0].fields[2].type).toBe(FieldType.string);
      expect(result[0].fields[3].values.toArray()).toEqual(['testjob', 'testjob', 'otherjob', 'otherjob']);
      expect(result[0].fields[3].name).toBe('job');
      expect(result[0].fields[3].type).toBe(FieldType.string);
      expect(result[0].fields[4].values.toArray()).toEqual([3846, 3848, 3847, 3849]);
      expect(result[0].fields[4].name).toEqual('Value');
      expect(result[0].fields[4].type).toBe(FieldType.number);
      expect(result[0].refId).toBe('A');
    });

    it('should include refId if response count is more than 2', () => {
      const result = transform({ data: response } as any, {
        ...options,
        target: {
          refId: 'B',
          format: 'table',
        },
        responseListLength: 2,
      });

      expect(result[0].fields[4].name).toEqual('Value #B');
    });
  });

  describe('When resultFormat is table and instant = true', () => {
    const response = {
      status: 'success',
      data: {
        resultType: 'vector',
        result: [
          {
            metric: { __name__: 'test', job: 'testjob' },
            value: [1443454528, '3846'],
          },
        ],
      },
    };

    it('should return data frame', () => {
      const result = transform({ data: response } as any, { ...options, target: { format: 'table' } });
      expect(result[0].fields[0].values.toArray()).toEqual([1443454528000]);
      expect(result[0].fields[0].name).toBe('Time');
      expect(result[0].fields[1].values.toArray()).toEqual(['test']);
      expect(result[0].fields[1].name).toBe('__name__');
      expect(result[0].fields[2].values.toArray()).toEqual(['testjob']);
      expect(result[0].fields[2].name).toBe('job');
      expect(result[0].fields[3].values.toArray()).toEqual([3846]);
      expect(result[0].fields[3].name).toEqual('Value');
    });

    it('should return le label values parsed as numbers', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'vector',
          result: [
            {
              metric: { le: '102' },
              value: [1594908838, '0'],
            },
          ],
        },
      };
      const result = transform({ data: response } as any, { ...options, target: { format: 'table' } });
      expect(result[0].fields[1].values.toArray()).toEqual([102]);
      expect(result[0].fields[1].type).toEqual(FieldType.number);
    });
  });

  describe('When instant = true', () => {
    const response = {
      status: 'success',
      data: {
        resultType: 'vector',
        result: [
          {
            metric: { __name__: 'test', job: 'testjob' },
            value: [1443454528, '3846'],
          },
        ],
      },
    };

    it('should return data frame', () => {
      const result: DataFrame[] = transform({ data: response } as any, { ...options, query: { instant: true } });
      expect(result[0].name).toBe('test{job="testjob"}');
    });
  });

  describe('When resultFormat is heatmap', () => {
    const getResponse = (result: any) => ({
      status: 'success',
      data: {
        resultType: 'matrix',
        result,
      },
    });

    const options = {
      format: 'heatmap',
      start: 1445000010,
      end: 1445000030,
      legendFormat: '{{le}}',
    };

    it('should convert cumulative histogram to regular', () => {
      const response = getResponse([
        {
          metric: { __name__: 'test', job: 'testjob', le: '1' },
          values: [
            [1445000010, '10'],
            [1445000020, '10'],
            [1445000030, '0'],
          ],
        },
        {
          metric: { __name__: 'test', job: 'testjob', le: '2' },
          values: [
            [1445000010, '20'],
            [1445000020, '10'],
            [1445000030, '30'],
          ],
        },
        {
          metric: { __name__: 'test', job: 'testjob', le: '3' },
          values: [
            [1445000010, '30'],
            [1445000020, '10'],
            [1445000030, '40'],
          ],
        },
      ]);

      const result = transform({ data: response } as any, { query: options, target: options } as any);
      expect(result[0].fields[0].values.toArray()).toEqual([1445000010000, 1445000020000, 1445000030000]);
      expect(result[0].fields[1].values.toArray()).toEqual([10, 10, 0]);
      expect(result[1].fields[0].values.toArray()).toEqual([1445000010000, 1445000020000, 1445000030000]);
      expect(result[1].fields[1].values.toArray()).toEqual([10, 0, 30]);
      expect(result[2].fields[0].values.toArray()).toEqual([1445000010000, 1445000020000, 1445000030000]);
      expect(result[2].fields[1].values.toArray()).toEqual([10, 0, 10]);
    });

    it('should handle missing datapoints', () => {
      const response = getResponse([
        {
          metric: { __name__: 'test', job: 'testjob', le: '1' },
          values: [
            [1445000010, '1'],
            [1445000020, '2'],
          ],
        },
        {
          metric: { __name__: 'test', job: 'testjob', le: '2' },
          values: [
            [1445000010, '2'],
            [1445000020, '5'],
            [1445000030, '1'],
          ],
        },
        {
          metric: { __name__: 'test', job: 'testjob', le: '3' },
          values: [
            [1445000010, '3'],
            [1445000020, '7'],
          ],
        },
      ]);
      const result = transform({ data: response } as any, { query: options, target: options } as any);
      expect(result[0].fields[1].values.toArray()).toEqual([1, 2]);
      expect(result[1].fields[1].values.toArray()).toEqual([1, 3, 1]);
      expect(result[2].fields[1].values.toArray()).toEqual([1, 2]);
    });
  });

  describe('When the response is a matrix', () => {
    it('should have labels with the value field', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'matrix',
          result: [
            {
              metric: { __name__: 'test', job: 'testjob', instance: 'testinstance' },
              values: [
                [0, '10'],
                [1, '10'],
                [2, '0'],
              ],
            },
          ],
        },
      };

      const result: DataFrame[] = transform({ data: response } as any, {
        ...options,
      });

      expect(result[0].fields[1].labels).toBeDefined();
      expect(result[0].fields[1].labels?.instance).toBe('testinstance');
      expect(result[0].fields[1].labels?.job).toBe('testjob');
    });

    it('should transform into a data frame', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'matrix',
          result: [
            {
              metric: { __name__: 'test', job: 'testjob' },
              values: [
                [0, '10'],
                [1, '10'],
                [2, '0'],
              ],
            },
          ],
        },
      };

      const result: DataFrame[] = transform({ data: response } as any, {
        ...options,
        query: {
          start: 0,
          end: 2,
        },
      });
      expect(result[0].fields[0].values.toArray()).toEqual([0, 1000, 2000]);
      expect(result[0].fields[1].values.toArray()).toEqual([10, 10, 0]);
      expect(result[0].name).toBe('test{job="testjob"}');
    });

    it('should fill null values', () => {
      const result = transform({ data: matrixResponse } as any, { ...options, query: { step: 1, start: 0, end: 2 } });

      expect(result[0].fields[0].values.toArray()).toEqual([0, 1000, 2000]);
      expect(result[0].fields[1].values.toArray()).toEqual([null, 10, 0]);
    });

    it('should use __name__ label as series name', () => {
      const result = transform({ data: matrixResponse } as any, {
        ...options,
        query: {
          step: 1,
          start: 0,
          end: 2,
        },
      });
      expect(result[0].name).toEqual('test{job="testjob"}');
    });

    it('should use query as series name when __name__ is not available and metric is empty', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'matrix',
          result: [
            {
              metric: {},
              values: [[0, '10']],
            },
          ],
        },
      };
      const expr = 'histogram_quantile(0.95, sum(rate(tns_request_duration_seconds_bucket[5m])) by (le))';
      const result = transform({ data: response } as any, {
        ...options,
        query: {
          step: 1,
          start: 0,
          end: 2,
          expr,
        },
      });
      expect(result[0].name).toEqual(expr);
    });

    it('should set frame name to undefined if no __name__ label but there are other labels', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'matrix',
          result: [
            {
              metric: { job: 'testjob' },
              values: [
                [1, '10'],
                [2, '0'],
              ],
            },
          ],
        },
      };

      const result = transform({ data: response } as any, {
        ...options,
        query: {
          step: 1,
          start: 0,
          end: 2,
        },
      });
      expect(result[0].name).toBe('{job="testjob"}');
    });

    it('should not set displayName for ValueFields', () => {
      const result = transform({ data: matrixResponse } as any, options);
      expect(result[0].fields[1].config.displayName).toBeUndefined();
      expect(result[0].fields[1].config.displayNameFromDS).toBe('test{job="testjob"}');
    });

    it('should align null values with step', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'matrix',
          result: [
            {
              metric: { __name__: 'test', job: 'testjob' },
              values: [
                [4, '10'],
                [8, '10'],
              ],
            },
          ],
        },
      };

      const result = transform({ data: response } as any, { ...options, query: { step: 2, start: 0, end: 8 } });
      expect(result[0].fields[0].values.toArray()).toEqual([0, 2000, 4000, 6000, 8000]);
      expect(result[0].fields[1].values.toArray()).toEqual([null, null, 10, null, 10]);
    });
  });

  describe('When infinity values are returned', () => {
    describe('When resultType is scalar', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'scalar',
          result: [1443454528, '+Inf'],
        },
      };

      it('should correctly parse values', () => {
        const result: DataFrame[] = transform({ data: response } as any, { ...options, target: { format: 'table' } });
        expect(result[0].fields[1].values.toArray()).toEqual([Number.POSITIVE_INFINITY]);
      });
    });

    describe('When resultType is vector', () => {
      const response = {
        status: 'success',
        data: {
          resultType: 'vector',
          result: [
            {
              metric: { __name__: 'test', job: 'testjob' },
              value: [1443454528, '+Inf'],
            },
            {
              metric: { __name__: 'test', job: 'testjob' },
              value: [1443454528, '-Inf'],
            },
          ],
        },
      };

      describe('When format is table', () => {
        it('should correctly parse values', () => {
          const result: DataFrame[] = transform({ data: response } as any, { ...options, target: { format: 'table' } });
          expect(result[0].fields[3].values.toArray()).toEqual([Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY]);
        });
      });
    });
  });

  const exemplarsResponse = {
    status: 'success',
    data: [
      {
        seriesLabels: { __name__: 'test' },
        exemplars: [
          {
            timestamp: 1610449069.957,
            labels: { traceID: '5020b5bc45117f07' },
            value: 0.002074123,
          },
        ],
      },
    ],
  };

  describe('When the response is exemplar data', () => {
    it('should return as an data frame with a dataTopic annotations', () => {
      const result = transform({ data: exemplarsResponse } as any, options);

      expect(result[0].meta?.dataTopic).toBe('annotations');
      expect(result[0].fields.length).toBe(4); // __name__, traceID, Time, Value
      expect(result[0].length).toBe(1);
    });

    it('should remove exemplars that are too close to each other', () => {
      const response = {
        status: 'success',
        data: [
          {
            exemplars: [
              {
                timestamp: 1610449070.0,
                value: 5,
              },
              {
                timestamp: 1610449070.0,
                value: 1,
              },
              {
                timestamp: 1610449070.5,
                value: 13,
              },
              {
                timestamp: 1610449070.3,
                value: 20,
              },
            ],
          },
        ],
      };
      /**
       * the standard deviation for the above values is 8.4 this means that we show the highest
       * value (20) and then the next value should be 2 times the standard deviation which is 1
       **/
      const result = transform({ data: response } as any, options);
      expect(result[0].length).toBe(2);
    });

    describe('data link', () => {
      it('should be added to the field if found with url', () => {
        const result = transform({ data: exemplarsResponse } as any, {
          ...options,
          exemplarTraceIdDestinations: [{ name: 'traceID', url: 'http://localhost' }],
        });

        expect(result[0].fields.some((f) => f.config.links?.length)).toBe(true);
      });

      it('should be added to the field if found with internal link', () => {
        const result = transform({ data: exemplarsResponse } as any, {
          ...options,
          exemplarTraceIdDestinations: [{ name: 'traceID', datasourceUid: 'jaeger' }],
        });

        expect(result[0].fields.some((f) => f.config.links?.length)).toBe(true);
      });

      it('should not add link if exemplarTraceIdDestinations is not configured', () => {
        const result = transform({ data: exemplarsResponse } as any, options);

        expect(result[0].fields.some((f) => f.config.links?.length)).toBe(false);
      });
    });
  });
});
