package ocagent

import (
	"reflect"
	"testing"

	"golang.org/x/tools/internal/telemetry"
	"golang.org/x/tools/internal/telemetry/export/ocagent/wire"
	"golang.org/x/tools/internal/telemetry/metric"
)

func TestDataToMetricDescriptor(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want *wire.MetricDescriptor
	}{
		{
			"nil data",
			nil,
			nil,
		},
		{
			"Int64Data gauge",
			&metric.Int64Data{
				Info: &metric.Scalar{
					Name:        "int",
					Description: "int metric",
					Keys:        []interface{}{"hello"},
				},
				IsGauge: true,
			},
			&wire.MetricDescriptor{
				Name:        "int",
				Description: "int metric",
				Type:        wire.MetricDescriptor_GAUGE_INT64,
				LabelKeys: []*wire.LabelKey{
					&wire.LabelKey{
						Key: "hello",
					},
				},
			},
		},
		{
			"Float64Data cumulative",
			&metric.Float64Data{
				Info: &metric.Scalar{
					Name:        "float",
					Description: "float metric",
					Keys:        []interface{}{"world"},
				},
				IsGauge: false,
			},
			&wire.MetricDescriptor{
				Name:        "float",
				Description: "float metric",
				Type:        wire.MetricDescriptor_CUMULATIVE_DOUBLE,
				LabelKeys: []*wire.LabelKey{
					&wire.LabelKey{
						Key: "world",
					},
				},
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := dataToMetricDescriptor(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestGetDescription(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want string
	}{
		{
			"nil data",
			nil,
			"",
		},
		{
			"Int64Data description",
			&metric.Int64Data{
				Info: &metric.Scalar{
					Description: "int metric",
				},
			},
			"int metric",
		},
		{
			"Float64Data description",
			&metric.Float64Data{
				Info: &metric.Scalar{
					Description: "float metric",
				},
			},
			"float metric",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := getDescription(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}

}

func TestGetLabelKeys(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want []*wire.LabelKey
	}{
		{
			"nil label keys",
			nil,
			nil,
		},
		{
			"Int64Data label keys",
			&metric.Int64Data{
				Info: &metric.Scalar{
					Keys: []interface{}{
						"hello",
					},
				},
			},
			[]*wire.LabelKey{
				&wire.LabelKey{
					Key: "hello",
				},
			},
		},
		{
			"Float64Data label keys",
			&metric.Float64Data{
				Info: &metric.Scalar{
					Keys: []interface{}{
						"world",
					},
				},
			},
			[]*wire.LabelKey{
				&wire.LabelKey{
					Key: "world",
				},
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := getLabelKeys(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestDataToMetricDescriptorType(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want wire.MetricDescriptor_Type
	}{
		{
			"Nil data",
			nil,
			wire.MetricDescriptor_UNSPECIFIED,
		},
		{
			"Gauge Int64",
			&metric.Int64Data{
				IsGauge: true,
			},
			wire.MetricDescriptor_GAUGE_INT64,
		},
		{
			"Cumulative Int64",
			&metric.Int64Data{
				IsGauge: false,
			},
			wire.MetricDescriptor_CUMULATIVE_INT64,
		},
		{
			"Gauge Float64",
			&metric.Float64Data{
				IsGauge: true,
			},
			wire.MetricDescriptor_GAUGE_DOUBLE,
		},
		{
			"Cumulative Float64",
			&metric.Float64Data{
				IsGauge: false,
			},
			wire.MetricDescriptor_CUMULATIVE_DOUBLE,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := dataToMetricDescriptorType(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestDataToTimeseries(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want []*wire.TimeSeries
	}{
		{
			"nil data",
			nil,
			nil,
		},
		{
			"Int64Data",
			&metric.Int64Data{
				Rows: []int64{
					1,
					2,
					3,
				},
			},
			[]*wire.TimeSeries{
				&wire.TimeSeries{
					Points: []*wire.Point{
						&wire.Point{
							Value: wire.PointInt64Value{Int64Value: 1},
						},
					},
				},
				&wire.TimeSeries{
					Points: []*wire.Point{
						&wire.Point{
							Value: wire.PointInt64Value{Int64Value: 2},
						},
					},
				},
				&wire.TimeSeries{
					Points: []*wire.Point{
						&wire.Point{
							Value: wire.PointInt64Value{Int64Value: 3},
						},
					},
				},
			},
		},
		{
			"Float64Data",
			&metric.Float64Data{
				Rows: []float64{
					1.5,
					4.5,
				},
			},
			[]*wire.TimeSeries{
				&wire.TimeSeries{
					Points: []*wire.Point{
						&wire.Point{
							Value: wire.PointDoubleValue{DoubleValue: 1.5},
						},
					},
				},
				&wire.TimeSeries{
					Points: []*wire.Point{
						&wire.Point{
							Value: wire.PointDoubleValue{DoubleValue: 4.5},
						},
					},
				},
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := dataToTimeseries(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestNumRows(t *testing.T) {
	tests := []struct {
		name string
		data telemetry.MetricData
		want int
	}{
		{
			"nil data",
			nil,
			0,
		},
		{
			"1 row Int64Data",
			&metric.Int64Data{
				Rows: []int64{
					0,
				},
			},
			1,
		},
		{
			"2 row Float64Data",
			&metric.Float64Data{
				Rows: []float64{
					0,
					1.0,
				},
			},
			2,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := numRows(tt.data)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestDataToPoints(t *testing.T) {
	int64Data := &metric.Int64Data{
		Rows: []int64{
			0,
			10,
		},
	}

	float64Data := &metric.Float64Data{
		Rows: []float64{
			0.5,
			0.25,
		},
	}

	tests := []struct {
		name string
		data telemetry.MetricData
		i    int
		want []*wire.Point
	}{
		{
			"nil data",
			nil,
			0,
			nil,
		},
		{
			"Int64data index 0",
			int64Data,
			0,
			[]*wire.Point{
				{
					Value: wire.PointInt64Value{
						Int64Value: 0,
					},
				},
			},
		},
		{
			"Int64data index 1",
			int64Data,
			1,
			[]*wire.Point{
				{
					Value: wire.PointInt64Value{
						Int64Value: 10,
					},
				},
			},
		},
		{
			"Float64Data index 0",
			float64Data,
			0,
			[]*wire.Point{
				{
					Value: wire.PointDoubleValue{
						DoubleValue: 0.5,
					},
				},
			},
		},
		{
			"Float64Data index 1",
			float64Data,
			1,
			[]*wire.Point{
				{
					Value: wire.PointDoubleValue{
						DoubleValue: 0.25,
					},
				},
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := dataToPoints(tt.data, tt.i)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}

func TestInfoKeysToLabelKeys(t *testing.T) {
	tests := []struct {
		name     string
		infoKeys []interface{}
		want     []*wire.LabelKey
	}{
		{
			"empty infoKeys",
			[]interface{}{},
			[]*wire.LabelKey{},
		},
		{
			"empty string infoKey",
			[]interface{}{""},
			[]*wire.LabelKey{
				&wire.LabelKey{
					Key: "",
				},
			},
		},
		{
			"non-empty string infoKey",
			[]interface{}{"hello"},
			[]*wire.LabelKey{
				&wire.LabelKey{
					Key: "hello",
				},
			},
		},
		{
			"multiple element infoKey",
			[]interface{}{"hello", "world"},
			[]*wire.LabelKey{
				&wire.LabelKey{
					Key: "hello",
				},
				&wire.LabelKey{
					Key: "world",
				},
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := infoKeysToLabelKeys(tt.infoKeys)
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("Got:\n%s\nWant:\n%s", marshaled(got), marshaled(tt.want))
			}
		})
	}
}