package notify

import "context"

func (c *ClientCommon) SetBulkHandler(fn func(BulkAcceptInfo) error) {
	runtime := c.getBulkRuntime()
	if runtime == nil {
		return
	}
	runtime.setHandler(fn)
}

func (c *ClientCommon) OpenBulk(ctx context.Context, opt BulkOpenOptions) (Bulk, error) {
	if c == nil {
		return nil, errBulkClientNil
	}
	runtime := c.getBulkRuntime()
	if runtime == nil {
		return nil, errBulkRuntimeNil
	}
	req := clientBulkRequest(runtime, opt)
	if req.BulkID == "" {
		return nil, errBulkIDEmpty
	}
	if req.Dedicated {
		if err := clientDedicatedBulkSupportError(c); err != nil {
			return nil, err
		}
	}
	if !validBulkRange(req.Range) {
		return nil, errBulkRangeInvalid
	}
	if _, exists := runtime.lookup(clientFileScope(), req.BulkID); exists {
		return nil, errBulkAlreadyExists
	}
	resp, err := sendBulkOpenClient(ctx, c, req)
	if err != nil {
		return nil, err
	}
	if resp.DataID != 0 {
		req.DataID = resp.DataID
	}
	req.Dedicated = resp.Dedicated
	if resp.AttachToken != "" {
		req.AttachToken = resp.AttachToken
	}
	if req.DataID == 0 {
		return nil, errBulkDataIDEmpty
	}
	bulk := newBulkHandle(c.clientStopContextSnapshot(), runtime, clientFileScope(), req, c.currentClientSessionEpoch(), nil, nil, resp.TransportGeneration, clientBulkCloseSender(c), clientBulkResetSender(c), clientBulkDataSender(c, c.currentClientSessionEpoch()), clientBulkWriteSender(c, c.currentClientSessionEpoch()), clientBulkReleaseSender(c))
	bulk.setClientSnapshotOwner(c)
	if err := runtime.register(clientFileScope(), bulk); err != nil {
		_, _ = sendBulkResetClient(context.Background(), c, BulkResetRequest{
			BulkID: req.BulkID,
			DataID: req.DataID,
			Error:  err.Error(),
		})
		return nil, err
	}
	if bulk.Dedicated() {
		if err := c.attachDedicatedBulkSidecar(ctx, bulk); err != nil {
			runtime.remove(clientFileScope(), bulk.ID())
			_, _ = sendBulkResetClient(context.Background(), c, BulkResetRequest{
				BulkID: bulk.ID(),
				DataID: bulk.dataIDSnapshot(),
				Error:  err.Error(),
			})
			return nil, err
		}
	}
	return bulk, nil
}

func clientBulkRequest(runtime *bulkRuntime, opt BulkOpenOptions) BulkOpenRequest {
	opt = normalizeBulkOpenOptions(opt)
	id := opt.ID
	if id == "" && runtime != nil {
		id = runtime.nextID()
	}
	return normalizeBulkOpenRequest(BulkOpenRequest{
		BulkID:       id,
		Range:        opt.Range,
		Metadata:     cloneBulkMetadata(opt.Metadata),
		ReadTimeout:  opt.ReadTimeout,
		WriteTimeout: opt.WriteTimeout,
		Dedicated:    opt.Dedicated,
		ChunkSize:    opt.ChunkSize,
		WindowBytes:  opt.WindowBytes,
		MaxInFlight:  opt.MaxInFlight,
	})
}

func clientBulkCloseSender(c *ClientCommon) bulkCloseSender {
	return func(ctx context.Context, bulk *bulkHandle, full bool) error {
		if bulk != nil && bulk.Dedicated() {
			if err := bulk.waitDedicatedReady(ctx); err != nil {
				return err
			}
			return c.sendDedicatedBulkClose(ctx, bulk, full)
		}
		_, err := sendBulkCloseClient(ctx, c, BulkCloseRequest{
			BulkID: bulk.ID(),
			Full:   full,
		})
		return err
	}
}

func clientBulkResetSender(c *ClientCommon) bulkResetSender {
	return func(ctx context.Context, bulk *bulkHandle, message string) error {
		if bulk != nil && bulk.Dedicated() {
			if err := bulk.waitDedicatedReady(ctx); err != nil {
				return err
			}
			return c.sendDedicatedBulkReset(ctx, bulk, message)
		}
		_, err := sendBulkResetClient(ctx, c, BulkResetRequest{
			BulkID: bulk.ID(),
			DataID: bulk.dataIDSnapshot(),
			Error:  message,
		})
		return err
	}
}

func clientBulkDataSender(c *ClientCommon, epoch uint64) bulkDataSender {
	return func(ctx context.Context, bulk *bulkHandle, chunk []byte) error {
		if c == nil {
			return errBulkClientNil
		}
		if ctx != nil {
			select {
			case <-ctx.Done():
				return ctx.Err()
			default:
			}
		}
		if bulk != nil && bulk.Dedicated() {
			if err := bulk.waitDedicatedReady(ctx); err != nil {
				return err
			}
			return c.sendDedicatedBulkData(ctx, bulk, chunk)
		}
		if epoch != 0 && !c.isClientSessionEpochCurrent(epoch) {
			return errTransportDetached
		}
		dataID := bulk.dataIDSnapshot()
		if dataID == 0 {
			return errBulkDataPathNotReady
		}
		return c.sendFastBulkData(ctx, dataID, bulk.nextOutboundDataSeq(), chunk)
	}
}

func clientBulkWriteSender(c *ClientCommon, epoch uint64) bulkWriteSender {
	return func(ctx context.Context, bulk *bulkHandle, payload []byte) (int, error) {
		if c == nil {
			return 0, errBulkClientNil
		}
		if ctx != nil {
			select {
			case <-ctx.Done():
				return 0, ctx.Err()
			default:
			}
		}
		if bulk != nil && bulk.Dedicated() {
			if err := bulk.waitDedicatedReady(ctx); err != nil {
				return 0, err
			}
			return c.sendDedicatedBulkWrite(ctx, bulk, payload)
		}
		if epoch != 0 && !c.isClientSessionEpochCurrent(epoch) {
			return 0, errTransportDetached
		}
		return 0, nil
	}
}

func clientBulkReleaseSender(c *ClientCommon) bulkReleaseSender {
	return func(bulk *bulkHandle, bytes int64, chunks int) error {
		if c == nil || bulk == nil {
			return errBulkClientNil
		}
		if bytes <= 0 && chunks <= 0 {
			return nil
		}
		if bulk.Dedicated() {
			return c.sendDedicatedBulkRelease(context.Background(), bulk, bytes, chunks)
		}
		return sendBulkReleaseClient(c, BulkReleaseRequest{
			BulkID: bulk.ID(),
			DataID: bulk.dataIDSnapshot(),
			Bytes:  bytes,
			Chunks: chunks,
		})
	}
}