import (
	"context"
	"io"
	"sync"
	"time"

	"github.com/minio/madmin-go/v3"
)

// naughtyDisk wraps a POSIX disk and returns programmed errors
// specified by the developer. The purpose is to simulate errors
// that are hard to simulate in practice like DiskNotFound.
// Programmed errors are stored in errors field.
type naughtyDisk struct {
	// The real disk
	disk StorageAPI
	// Programmed errors: API call number => error to return

	// single node setup, this degenerates to a simple function
	// call under the hood.
	globalMinioAddr = "127.0.0.1:9000"

	var wg sync.WaitGroup

	// Setting up a go routine to simulate ServerRouter's
	// handleServiceSignals for stop and restart commands.
	if cmd == restartCmd {
		wg.Add(1)
		go func() {
			defer wg.Done()
			testServiceSignalReceiver(cmd, t)
		}()
	}

		"00000000-0000-0000-0000-0000000000f1",
		"00000000-0000-0000-0000-0000000000f2",
	}
	// Simulate overwrite of null version
	newtierfi := tierfi
	newtierfi.SetTierFreeVersionID(fvIDs[0])
	fatalErr(xl.AddFreeVersion(newtierfi))
	report()
	fatalErr(xl.AddVersion(newtierfi))
	report()

	// Simulate removal of null version
	newtierfi.TransitionTier = ""
	newtierfi.TransitionedObjName = ""

		},
		{
			val:   0.79,
			label: labels[2],
		},
	}
	ticker := time.NewTicker(1 * time.Millisecond)
	defer ticker.Stop()
	for _, obs := range observations {
		// Send observations once every 1ms, to simulate delay between
		// observations. This is to test the channel based
		// synchronization used internally.
		select {
		case <-ticker.C:
			ttfbHist.With(prometheus.Labels{"api": obs.label}).Observe(obs.val)
		}
	}

	fileInfoPreHeal, err := disk.ReadVersion(context.Background(), "", bucket, object, "", ReadOptions{ReadData: false, Healing: true})
	if err != nil {
		t.Fatal(err)
	}

	// Remove the object - to simulate the case where the disk was down when the object
	// was created.
	err = removeAll(pathJoin(disk.String(), bucket, object))
	if err != nil {
		t.Fatal(err)
	}

	// Checking abandoned parts should do nothing

		fi.ModTime = basefi.ModTime.Add(time.Duration(i) * time.Second)
		if err := xl.AddVersion(fi); err != nil {
			t.Fatalf("%d: Failed to add version %v", i+1, err)
		}

		if i > 3 {
			// Simulate transition of a version
			transfi := fi
			transfi.TransitionStatus = lifecycle.TransitionComplete
			transfi.TransitionTier = "MINIO-TIER"
			transfi.TransitionedObjName = mustGetUUID()
			xl.DeleteVersion(transfi)

			return
		}
		received := string(b)
		if received != "message one\n" {
			t.Errorf(`server: expected: "message one\n", got: %v`, received)
			return
		}

		// Wait for more than read timeout to simulate processing.
		time.Sleep(3 * time.Second)

		_, terr = deadlineconn.Read(b)
		if terr != nil {
			t.Errorf("failed to read from client. %v", terr)
			return
		}
		received = string(b)

}

// Test canceling context while quorum servers report lock not found
func TestFailedRefreshLock(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	// Simulate Refresh response to return no locking found
	for i := range lockServers[:3] {
		lockServers[i].setRefreshReply(false)
		defer lockServers[i].setRefreshReply(true)
	}

	dm := NewDRWMutex(ds, "aap")

	"github.com/minio/minio/internal/hash/sha256"
	xhttp "github.com/minio/minio/internal/http"
	ioutilx "github.com/minio/minio/internal/ioutil"
)

// Type to capture different modifications to API request to simulate failure cases.
type Fault int

const (
	None Fault = iota
	MissingContentLength
	TooBigObject
	TooBigDecodedLength
	BadSignature
	BadMD5
	MissingUploadID
)

	os.RemoveAll(testServer.Root)
	for _, ep := range testServer.Disks {
		for _, disk := range ep.Endpoints {
			os.RemoveAll(disk.Path)
		}
	}
}

// Truncate request to simulate unexpected EOF for a request signed using streaming signature v4.
func truncateChunkByHalfSigv4(req *http.Request) (*http.Request, error) {
	bufReader := bufio.NewReader(req.Body)