package testutil

import (
	"crypto/sha256"

	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/version"
	"git.frostfs.info/TrueCloudLab/tzhash/tz"
	"golang.org/x/exp/rand"
)

const defaultDataSize = 32

func GenerateObject() *objectSDK.Object {
	return GenerateObjectWithCID(cidtest.ID())
}

func GenerateObjectWithSize(sz int) *objectSDK.Object {
	data := make([]byte, sz)
	_, _ = rand.Read(data)
	return GenerateObjectWithCIDWithPayload(cidtest.ID(), data)
}

func GenerateObjectWithCID(cnr cid.ID) *objectSDK.Object {
	data := make([]byte, defaultDataSize)
	_, _ = rand.Read(data)
	return GenerateObjectWithCIDWithPayload(cnr, data)
}

func GenerateObjectWithCIDWithPayload(cnr cid.ID, data []byte) *objectSDK.Object {
	var ver version.Version
	ver.SetMajor(2)
	ver.SetMinor(1)

	var csum checksum.Checksum
	csum.SetSHA256(sha256.Sum256(data))

	var csumTZ checksum.Checksum
	csumTZ.SetTillichZemor(tz.Sum(csum.Value()))

	obj := objectSDK.New()
	obj.SetID(oidtest.ID())
	obj.SetOwnerID(usertest.ID())
	obj.SetContainerID(cnr)
	obj.SetVersion(&ver)
	obj.SetPayload(data)
	obj.SetPayloadChecksum(csum)
	obj.SetPayloadHomomorphicHash(csumTZ)

	return obj
}

func AddAttribute(obj *objectSDK.Object, key, val string) {
	var attr objectSDK.Attribute
	attr.SetKey(key)
	attr.SetValue(val)

	attrs := obj.Attributes()
	attrs = append(attrs, attr)
	obj.SetAttributes(attrs...)
}

func AddPayload(obj *objectSDK.Object, size int) {
	buf := make([]byte, size)
	_, _ = rand.Read(buf)

	obj.SetPayload(buf)
	obj.SetPayloadSize(uint64(size))
}