package proxy

import (
	"git.frostfs.info/TrueCloudLab/frostfs-contract/common"
	"github.com/nspcc-dev/neo-go/pkg/interop"
	"github.com/nspcc-dev/neo-go/pkg/interop/native/gas"
	"github.com/nspcc-dev/neo-go/pkg/interop/native/management"
	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
)

const accountKeyPrefix = 'a'

// OnNEP17Payment is a callback for NEP-17 compatible native GAS contract.
func OnNEP17Payment(from interop.Hash160, amount int, data any) {
	caller := runtime.GetCallingScriptHash()
	if !common.BytesEqual(caller, []byte(gas.Hash)) {
		common.AbortWithMessage("proxy contract accepts GAS only")
	}
}

func _deploy(data any, isUpdate bool) {
	if isUpdate {
		args := data.([]any)
		common.CheckVersion(args[len(args)-1].(int))
		return
	}

	runtime.Log("proxy contract initialized")
}

// Update method updates contract source code and manifest. It can be invoked
// only by committee.
func Update(script []byte, manifest []byte, data any) {
	if !common.HasUpdateAccess() {
		panic("only committee can update contract")
	}

	management.UpdateWithData(script, manifest, common.AppendVersion(data))
	runtime.Log("proxy contract updated")
}

// Verify method returns true if transaction contains valid multisignature of
// Alphabet nodes of the Inner Ring or any of the trusted accounts added via AddAccount.
func Verify() bool {
	if !runtime.GetScriptContainer().Sender.Equals(runtime.GetExecutingScriptHash()) {
		return false
	}

	signers := runtime.CurrentSigners()
	ctx := storage.GetReadOnlyContext()
	for i := 1; /* skip sender */ i < len(signers); i++ {
		if storage.Get(ctx, append([]byte{accountKeyPrefix}, signers[i].Account...)) != nil {
			return true
		}
	}

	if runtime.CheckWitness(common.CommitteeAddress()) {
		return true
	}

	if runtime.CheckWitness(common.AlphabetAddress()) {
		return true
	}

	return false
}

// Version returns the version of the contract.
func Version() int {
	return common.Version
}

func AddAccount(addr interop.Hash160) {
	common.CheckWitness(common.CommitteeAddress())

	ctx := storage.GetContext()
	storage.Put(ctx, append([]byte{accountKeyPrefix}, addr...), []byte{1})
}

func RemoveAccount(addr interop.Hash160) {
	common.CheckWitness(common.CommitteeAddress())

	ctx := storage.GetContext()
	storage.Delete(ctx, append([]byte{accountKeyPrefix}, addr...))
}