package testsuite

import (
	"bytes"
	"context"
	"io"
	"testing"

	"forge.cadoles.com/arcad/edge/pkg/storage"
	"github.com/pkg/errors"
)

type blobStoreTestCase struct {
	Name string
	Run  func(ctx context.Context, store storage.BlobStore) error
}

var blobStoreTestCases = []blobStoreTestCase{
	{
		Name: "Open then delete bucket",
		Run: func(ctx context.Context, store storage.BlobStore) error {
			bucketName := "open-new-bucket"

			bucket, err := store.OpenBucket(ctx, bucketName)
			if err != nil {
				return errors.WithStack(err)
			}

			if bucket == nil {
				return errors.New("bucket should not be nil")
			}

			size, err := bucket.Size(ctx)
			if err != nil {
				return errors.WithStack(err)
			}

			if e, g := int64(0), size; e != g {
				return errors.Errorf("bucket size: expected '%v', got '%v'", e, g)
			}

			blobs, err := bucket.List(ctx)
			if err != nil {
				return errors.WithStack(err)
			}

			if e, g := 0, len(blobs); e != g {
				return errors.Errorf("len(blobs): expected '%v', got '%v'", e, g)
			}

			if err := bucket.Close(); err != nil {
				return errors.WithStack(err)
			}

			if err := store.DeleteBucket(ctx, bucketName); err != nil {
				return errors.WithStack(err)
			}

			buckets, err := store.ListBuckets(ctx)
			if err != nil {
				return errors.WithStack(err)
			}

			for _, b := range buckets {
				if b != bucketName {
					continue
				}

				return errors.Errorf("bucket '%s' should be deleted", bucketName)
			}

			return nil
		},
	},
	{
		Name: "Create blob",
		Run: func(ctx context.Context, store storage.BlobStore) error {
			bucket, err := store.OpenBucket(ctx, "create-blob")
			if err != nil {
				return errors.WithStack(err)
			}

			blobID := storage.NewBlobID()

			writer, err := bucket.NewWriter(ctx, blobID)
			if err != nil {
				return errors.WithStack(err)
			}

			data := []byte("foo")

			written, err := writer.Write(data)
			if err != nil {
				return errors.WithStack(err)
			}

			if e, g := len(data), written; e != g {
				return errors.Errorf("length of written data: expected '%v', got '%v'", e, g)
			}

			if err := writer.Close(); err != nil {
				panic(errors.WithStack(err))
			}

			reader, err := bucket.NewReader(ctx, blobID)
			if err != nil {
				return errors.WithStack(err)
			}

			var buf bytes.Buffer

			written64, err := io.Copy(&buf, reader)
			if err != nil {
				return errors.WithStack(err)
			}

			if e, g := int64(len(data)), written64; e != g {
				return errors.Errorf("length of written data: expected '%v', got '%v'", e, g)
			}

			if err := reader.Close(); err != nil {
				panic(errors.WithStack(err))
			}

			reader, err = bucket.NewReader(ctx, blobID)
			if err != nil {
				return errors.WithStack(err)
			}

			written64, err = io.Copy(&buf, reader)
			if err != nil {
				return errors.WithStack(err)
			}

			if e, g := int64(len(data)), written64; e != g {
				return errors.Errorf("length of written data: expected '%v', got '%v'", e, g)
			}

			if err := reader.Close(); err != nil {
				panic(errors.WithStack(err))
			}

			if err := bucket.Close(); err != nil {
				return errors.WithStack(err)
			}

			return nil
		},
	},
}

func testBlobStoreOps(ctx context.Context, t *testing.T, store storage.BlobStore) {
	for _, tc := range blobStoreTestCases {
		func(tc blobStoreTestCase) {
			t.Run(tc.Name, func(t *testing.T) {
				t.Parallel()

				if err := tc.Run(ctx, store); err != nil {
					t.Errorf("%+v", errors.WithStack(err))
				}
			})
		}(tc)
	}
}