/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package provider

import (
	"testing"

	"k8s.io/apimachinery/pkg/selection"

	"github.com/directxman12/k8s-prometheus-adapter/pkg/client"
	"github.com/stretchr/testify/require"
)

func TestBadQueryPartsDontBuildQueries(t *testing.T) {
	builder, _ := NewQueryBuilder("rate(<<.Series>>{<<.LabelMatchers>>}[2m])")
	_, err := builder.BuildSelector("my_series", "", []string{}, []queryPart{
		{
			labelName: "",
			values:    nil,
		},
		{
			labelName: "",
			values:    []string{},
		},
	})

	require.Error(t, err)
}

func runQueryBuilderTest(t *testing.T, queryParts []queryPart, expectation string) {
	builder, _ := NewQueryBuilder("rate(<<.Series>>{<<.LabelMatchers>>}[2m])")
	selector, err := builder.BuildSelector("my_series", "", []string{}, queryParts)

	expectError := expectation == ""

	if expectError {
		require.Error(t, err)
	} else {
		selectorExpectation := client.Selector(expectation)
		require.NoError(t, err)
		require.Equal(t, selector, selectorExpectation)
	}
}

/*
func TestSimpleQuery(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{}, "")
}
*/

//Equals
func TestEqualsQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.Equals,
		},
	}, "")
}

func TestEqualsQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.Equals,
		},
	}, "rate(my_series{target_label=\"one\"}[2m])")
}

func TestEqualsQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.Equals,
		},
	}, "rate(my_series{target_label=~\"one|two\"}[2m])")
}

//Double Equals
func TestDoubleEqualsQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.DoubleEquals,
		},
	}, "")
}

func TestDoubleEqualsQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.DoubleEquals,
		},
	}, "rate(my_series{target_label=\"one\"}[2m])")
}

func TestDoubleEqualsQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.DoubleEquals,
		},
	}, "rate(my_series{target_label=~\"one|two\"}[2m])")
}

//Not Equals
func TestNotEqualsQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.NotEquals,
		},
	}, "")
}

func TestNotEqualsQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.NotEquals,
		},
	}, "rate(my_series{target_label!=\"one\"}[2m])")
}

func TestNotEqualsQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.NotEquals,
		},
	}, "rate(my_series{target_label!~\"one|two\"}[2m])")
}

//In
func TestInQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.In,
		},
	}, "")
}

func TestInQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.In,
		},
	}, "rate(my_series{target_label=~\"one\"}[2m])")
}

func TestInQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.In,
		},
	}, "rate(my_series{target_label=~\"one|two\"}[2m])")
}

//NotIn
func TestNotInQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.NotIn,
		},
	}, "")
}

func TestNotInQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.NotIn,
		},
	}, "rate(my_series{target_label!~\"one\"}[2m])")
}

func TestNotInQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.NotIn,
		},
	}, "rate(my_series{target_label!~\"one|two\"}[2m])")
}

//Exists
func TestExistsQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.Exists,
		},
	}, "rate(my_series{target_label!=\"\"}[2m])")
}

func TestExistsQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.Exists,
		},
	}, "")
}

func TestExistsQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.Exists,
		},
	}, "")
}

//DoesNotExist
func TestDoesNotExistsQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.DoesNotExist,
		},
	}, "rate(my_series{target_label=\"\"}[2m])")
}

func TestDoesNotExistsQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.DoesNotExist,
		},
	}, "")
}

func TestDoesNotExistsQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.DoesNotExist,
		},
	}, "")
}

//GreaterThan
func TestGreaterThanQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.GreaterThan,
		},
	}, "")
}

func TestGreaterThanQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.GreaterThan,
		},
	}, "")
}

func TestGreaterThanQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.GreaterThan,
		},
	}, "")
}

//LessThan
func TestLessThanQueryWithNoLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{},
			operator:  selection.LessThan,
		},
	}, "")
}

func TestLessThanQueryWithOneLabelValue(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one"},
			operator:  selection.LessThan,
		},
	}, "")
}

func TestLessThanQueryWithMultipleLabelValues(t *testing.T) {
	runQueryBuilderTest(t, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.LessThan,
		},
	}, "")
}

func TestQueryWithGroupBy(t *testing.T) {
	builder, _ := NewQueryBuilder("sum(rate(<<.Series>>{<<.LabelMatchers>>}[2m])) by (<<.GroupBy>>)")

	selector, _ := builder.BuildSelector("my_series", "my_grouping", []string{}, []queryPart{
		{
			labelName: "target_label",
			values:    []string{"one", "two"},
			operator:  selection.In,
		},
	})

	expectation := client.Selector("sum(rate(my_series{target_label=~\"one|two\"}[2m])) by (my_grouping)")
	require.Equal(t, selector, expectation)
}

// TODO: Ensure that the LabelValuesByName and GroupBySlice placeholders function correctly.