//go:build metrics
// +build metrics

package monitoring_test

import (
	"net/http"
	"testing"
	"time"

	. "github.com/smartystreets/goconvey/convey"
	"gopkg.in/resty.v1"

	"zotregistry.io/zot/pkg/api"
	"zotregistry.io/zot/pkg/api/config"
	extconf "zotregistry.io/zot/pkg/extensions/config"
	"zotregistry.io/zot/pkg/extensions/monitoring"
	test "zotregistry.io/zot/pkg/test/common"
	. "zotregistry.io/zot/pkg/test/image-utils"
	ociutils "zotregistry.io/zot/pkg/test/oci-utils"
)

func TestExtensionMetrics(t *testing.T) {
	Convey("Make a new controller with explicitly enabled metrics", t, func() {
		port := test.GetFreePort()
		baseURL := test.GetBaseURL(port)
		conf := config.New()
		conf.HTTP.Port = port

		rootDir := t.TempDir()

		conf.Storage.RootDirectory = rootDir
		conf.Extensions = &extconf.ExtensionConfig{}
		enabled := true
		conf.Extensions.Metrics = &extconf.MetricsConfig{
			BaseConfig: extconf.BaseConfig{Enable: &enabled},
			Prometheus: &extconf.PrometheusConfig{Path: "/metrics"},
		}

		ctlr := api.NewController(conf)
		So(ctlr, ShouldNotBeNil)

		cm := test.NewControllerManager(ctlr)
		cm.StartAndWait(port)
		defer cm.StopServer()

		// improve code coverage
		ctlr.Metrics.SendMetric(baseURL)
		ctlr.Metrics.ForceSendMetric(baseURL)

		So(ctlr.Metrics.IsEnabled(), ShouldBeTrue)
		So(ctlr.Metrics.ReceiveMetrics(), ShouldBeNil)

		monitoring.ObserveHTTPRepoLatency(ctlr.Metrics,
			"/v2/alpine/blobs/uploads/299148f0-0e32-4830-90d2-a3fa744137d9", time.Millisecond)
		monitoring.IncDownloadCounter(ctlr.Metrics, "alpine")
		monitoring.IncUploadCounter(ctlr.Metrics, "alpine")

		srcStorageCtlr := ociutils.GetDefaultStoreController(rootDir, ctlr.Log)
		err := WriteImageToFileSystem(CreateDefaultImage(), "alpine", "0.0.1", srcStorageCtlr)
		So(err, ShouldBeNil)

		monitoring.SetStorageUsage(ctlr.Metrics, rootDir, "alpine")

		monitoring.ObserveStorageLockLatency(ctlr.Metrics, time.Millisecond, rootDir, "RWLock")

		resp, err := resty.R().Get(baseURL + "/metrics")
		So(err, ShouldBeNil)
		So(resp, ShouldNotBeNil)
		So(resp.StatusCode(), ShouldEqual, http.StatusOK)

		respStr := string(resp.Body())
		So(respStr, ShouldContainSubstring, "zot_repo_downloads_total{repo=\"alpine\"} 1")
		So(respStr, ShouldContainSubstring, "zot_repo_uploads_total{repo=\"alpine\"} 1")
		So(respStr, ShouldContainSubstring, "zot_repo_storage_bytes{repo=\"alpine\"}")
		So(respStr, ShouldContainSubstring, "zot_storage_lock_latency_seconds_bucket")
		So(respStr, ShouldContainSubstring, "zot_storage_lock_latency_seconds_sum")
		So(respStr, ShouldContainSubstring, "zot_storage_lock_latency_seconds_bucket")
	})
	Convey("Make a new controller with disabled metrics extension", t, func() {
		port := test.GetFreePort()
		baseURL := test.GetBaseURL(port)
		conf := config.New()
		conf.HTTP.Port = port

		conf.Storage.RootDirectory = t.TempDir()
		conf.Extensions = &extconf.ExtensionConfig{}
		var disabled bool
		conf.Extensions.Metrics = &extconf.MetricsConfig{BaseConfig: extconf.BaseConfig{Enable: &disabled}}

		ctlr := api.NewController(conf)
		So(ctlr, ShouldNotBeNil)

		cm := test.NewControllerManager(ctlr)
		cm.StartAndWait(port)
		defer cm.StopServer()

		So(ctlr.Metrics.IsEnabled(), ShouldBeFalse)

		resp, err := resty.R().Get(baseURL + "/metrics")
		So(err, ShouldBeNil)
		So(resp, ShouldNotBeNil)
		So(resp.StatusCode(), ShouldEqual, http.StatusNotFound)
	})
}