package azuremonitor

import (
	"encoding/json"
	"fmt"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
	"github.com/grafana/grafana/pkg/components/simplejson"
	"github.com/grafana/grafana/pkg/models"
	"github.com/grafana/grafana/pkg/plugins"
	"github.com/grafana/grafana/pkg/tsdb"
	"github.com/stretchr/testify/require"

	. "github.com/smartystreets/goconvey/convey"
)

func TestApplicationInsightsDatasource(t *testing.T) {
	Convey("ApplicationInsightsDatasource", t, func() {
		datasource := &ApplicationInsightsDatasource{}

		Convey("Parse queries from frontend and build AzureMonitor API queries", func() {
			fromStart := time.Date(2018, 3, 15, 13, 0, 0, 0, time.UTC).In(time.Local)
			tsdbQuery := &tsdb.TsdbQuery{
				TimeRange: &tsdb.TimeRange{
					From: fmt.Sprintf("%v", fromStart.Unix()*1000),
					To:   fmt.Sprintf("%v", fromStart.Add(34*time.Minute).Unix()*1000),
				},
				Queries: []*tsdb.Query{
					{
						DataSource: &models.DataSource{
							JsonData: simplejson.NewFromAny(map[string]interface{}{}),
						},
						Model: simplejson.NewFromAny(map[string]interface{}{
							"appInsights": map[string]interface{}{
								"rawQuery":    false,
								"timeGrain":   "PT1M",
								"aggregation": "Average",
								"metricName":  "server/exceptions",
								"alias":       "testalias",
								"queryType":   "Application Insights",
							},
						}),
						RefId:      "A",
						IntervalMs: 1234,
					},
				},
			}
			Convey("and is a normal query", func() {
				queries, err := datasource.buildQueries(tsdbQuery.Queries, tsdbQuery.TimeRange)
				So(err, ShouldBeNil)

				So(len(queries), ShouldEqual, 1)
				So(queries[0].RefID, ShouldEqual, "A")
				So(queries[0].ApiURL, ShouldEqual, "metrics/server/exceptions")
				So(queries[0].Target, ShouldEqual, "aggregation=Average&interval=PT1M&timespan=2018-03-15T13%3A00%3A00Z%2F2018-03-15T13%3A34%3A00Z")
				So(len(queries[0].Params), ShouldEqual, 3)
				So(queries[0].Params["timespan"][0], ShouldEqual, "2018-03-15T13:00:00Z/2018-03-15T13:34:00Z")
				So(queries[0].Params["aggregation"][0], ShouldEqual, "Average")
				So(queries[0].Params["interval"][0], ShouldEqual, "PT1M")
				So(queries[0].Alias, ShouldEqual, "testalias")
			})

			Convey("and has a time grain set to auto", func() {
				tsdbQuery.Queries[0].Model = simplejson.NewFromAny(map[string]interface{}{
					"appInsights": map[string]interface{}{
						"rawQuery":    false,
						"timeGrain":   "auto",
						"aggregation": "Average",
						"metricName":  "Percentage CPU",
						"alias":       "testalias",
						"queryType":   "Application Insights",
					},
				})
				tsdbQuery.Queries[0].IntervalMs = 400000

				queries, err := datasource.buildQueries(tsdbQuery.Queries, tsdbQuery.TimeRange)
				So(err, ShouldBeNil)

				So(queries[0].Params["interval"][0], ShouldEqual, "PT15M")
			})

			Convey("and has a time grain set to auto and the metric has a limited list of allowed time grains", func() {
				tsdbQuery.Queries[0].Model = simplejson.NewFromAny(map[string]interface{}{
					"appInsights": map[string]interface{}{
						"rawQuery":            false,
						"timeGrain":           "auto",
						"aggregation":         "Average",
						"metricName":          "Percentage CPU",
						"alias":               "testalias",
						"queryType":           "Application Insights",
						"allowedTimeGrainsMs": []int64{60000, 300000},
					},
				})
				tsdbQuery.Queries[0].IntervalMs = 400000

				queries, err := datasource.buildQueries(tsdbQuery.Queries, tsdbQuery.TimeRange)
				So(err, ShouldBeNil)

				So(queries[0].Params["interval"][0], ShouldEqual, "PT5M")
			})

			Convey("and has a dimension filter", func() {
				tsdbQuery.Queries[0].Model = simplejson.NewFromAny(map[string]interface{}{
					"appInsights": map[string]interface{}{
						"rawQuery":        false,
						"timeGrain":       "PT1M",
						"aggregation":     "Average",
						"metricName":      "Percentage CPU",
						"alias":           "testalias",
						"queryType":       "Application Insights",
						"dimension":       "blob",
						"dimensionFilter": "blob eq '*'",
					},
				})

				queries, err := datasource.buildQueries(tsdbQuery.Queries, tsdbQuery.TimeRange)
				So(err, ShouldBeNil)

				So(queries[0].Target, ShouldEqual, "aggregation=Average&filter=blob+eq+%27%2A%27&interval=PT1M&segment=blob&timespan=2018-03-15T13%3A00%3A00Z%2F2018-03-15T13%3A34%3A00Z")
				So(queries[0].Params["filter"][0], ShouldEqual, "blob eq '*'")
			})

			Convey("and has a dimension filter set to None", func() {
				tsdbQuery.Queries[0].Model = simplejson.NewFromAny(map[string]interface{}{
					"appInsights": map[string]interface{}{
						"rawQuery":    false,
						"timeGrain":   "PT1M",
						"aggregation": "Average",
						"metricName":  "Percentage CPU",
						"alias":       "testalias",
						"queryType":   "Application Insights",
						"dimension":   "None",
					},
				})

				queries, err := datasource.buildQueries(tsdbQuery.Queries, tsdbQuery.TimeRange)
				So(err, ShouldBeNil)

				So(queries[0].Target, ShouldEqual, "aggregation=Average&interval=PT1M&timespan=2018-03-15T13%3A00%3A00Z%2F2018-03-15T13%3A34%3A00Z")
			})
		})
	})
}

func TestAppInsightsPluginRoutes(t *testing.T) {
	datasource := &ApplicationInsightsDatasource{}
	plugin := &plugins.DataSourcePlugin{
		Routes: []*plugins.AppPluginRoute{
			{
				Path:   "appinsights",
				Method: "GET",
				URL:    "https://api.applicationinsights.io",
				Headers: []plugins.AppPluginRouteHeader{
					{Name: "X-API-Key", Content: "{{.SecureJsonData.appInsightsApiKey}}"},
					{Name: "x-ms-app", Content: "Grafana"},
				},
			},
			{
				Path:   "chinaappinsights",
				Method: "GET",
				URL:    "https://api.applicationinsights.azure.cn",
				Headers: []plugins.AppPluginRouteHeader{
					{Name: "X-API-Key", Content: "{{.SecureJsonData.appInsightsApiKey}}"},
					{Name: "x-ms-app", Content: "Grafana"},
				},
			},
		},
	}

	tests := []struct {
		name              string
		cloudName         string
		expectedRouteName string
		expectedRouteURL  string
		Err               require.ErrorAssertionFunc
	}{
		{
			name:              "plugin proxy route for the Azure public cloud",
			cloudName:         "azuremonitor",
			expectedRouteName: "appinsights",
			expectedRouteURL:  "https://api.applicationinsights.io",
			Err:               require.NoError,
		},
		{
			name:              "plugin proxy route for the Azure China cloud",
			cloudName:         "chinaazuremonitor",
			expectedRouteName: "chinaappinsights",
			expectedRouteURL:  "https://api.applicationinsights.azure.cn",
			Err:               require.NoError,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			route, routeName, err := datasource.getPluginRoute(plugin, tt.cloudName)
			tt.Err(t, err)

			if diff := cmp.Diff(tt.expectedRouteURL, route.URL, cmpopts.EquateNaNs()); diff != "" {
				t.Errorf("Result mismatch (-want +got):\n%s", diff)
			}

			if diff := cmp.Diff(tt.expectedRouteName, routeName, cmpopts.EquateNaNs()); diff != "" {
				t.Errorf("Result mismatch (-want +got):\n%s", diff)
			}
		})
	}
}
func TestInsightsDimensionsUnmarshalJSON(t *testing.T) {
	a := []byte(`"foo"`)
	b := []byte(`["foo"]`)
	c := []byte(`["none"]`)
	d := []byte(`["None"]`)
	e := []byte("null")
	f := []byte(`""`)
	g := []byte(`"none"`)

	var as InsightsDimensions
	var bs InsightsDimensions
	err := json.Unmarshal(a, &as)

	require.NoError(t, err)
	require.Equal(t, []string{"foo"}, []string(as))

	err = json.Unmarshal(b, &bs)
	require.NoError(t, err)

	require.Equal(t, []string{"foo"}, []string(bs))

	var cs InsightsDimensions
	err = json.Unmarshal(c, &cs)
	require.NoError(t, err)
	require.Empty(t, cs)

	var ds InsightsDimensions
	err = json.Unmarshal(d, &ds)
	require.NoError(t, err)
	require.Empty(t, ds)

	var es InsightsDimensions
	err = json.Unmarshal(e, &es)
	require.NoError(t, err)
	require.Empty(t, es)

	var fs InsightsDimensions
	err = json.Unmarshal(f, &fs)
	require.NoError(t, err)
	require.Empty(t, fs)

	var gs InsightsDimensions
	err = json.Unmarshal(g, &gs)
	require.NoError(t, err)
	require.Empty(t, gs)
}