package reputation

import (
	"github.com/nspcc-dev/neo-go/pkg/interop"
	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
	"github.com/nspcc-dev/neo-go/pkg/interop/iterator"
	"github.com/nspcc-dev/neo-go/pkg/interop/native/management"
	"github.com/nspcc-dev/neo-go/pkg/interop/native/std"
	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
	"github.com/nspcc-dev/neofs-contract/common"
)

const (
	notaryDisabledKey = "notary"
)

func _deploy(data interface{}, isUpdate bool) {
	if isUpdate {
		return
	}

	args := data.([]interface{})
	notaryDisabled := args[0].(bool)

	ctx := storage.GetContext()

	// initialize the way to collect signatures
	storage.Put(ctx, notaryDisabledKey, notaryDisabled)
	if notaryDisabled {
		common.InitVote(ctx)
		runtime.Log("reputation contract notary disabled")
	}

	runtime.Log("reputation contract initialized")
}

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

	contract.Call(interop.Hash160(management.Hash), "update",
		contract.All, script, manifest, common.AppendVersion(data))
	runtime.Log("reputation contract updated")
}

// Put method saves DataAuditResult in contract storage. Can be invoked only by
// Inner Ring nodes. Does not require multi signature invocations.
//
// Epoch is an epoch number when DataAuditResult structure was generated.
// PeerID contains public keys of Inner Ring node that produced DataAuditResult.
// Value contains stable marshaled structure of DataAuditResult.
func Put(epoch int, peerID []byte, value []byte) {
	ctx := storage.GetContext()
	notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)

	var ( // for invocation collection without notary
		alphabet     []common.IRNode
		nodeKey      []byte
		alphabetCall bool
	)

	if notaryDisabled {
		alphabet = common.AlphabetNodes()
		nodeKey = common.InnerRingInvoker(alphabet)
		alphabetCall = len(nodeKey) != 0
	} else {
		multiaddr := common.AlphabetAddress()
		alphabetCall = runtime.CheckWitness(multiaddr)
	}

	if !alphabetCall {
		runtime.Notify("reputationPut", epoch, peerID, value)
		return
	}

	id := storageID(epoch, peerID)

	reputationValues := GetByID(id)
	reputationValues = append(reputationValues, value)

	rawValues := std.Serialize(reputationValues)

	if notaryDisabled {
		threshold := len(alphabet)*2/3 + 1

		n := common.Vote(ctx, id, nodeKey)
		if n < threshold {
			return
		}

		common.RemoveVotes(ctx, id)
	}

	storage.Put(ctx, id, rawValues)
}

// Get method returns list of all stable marshaled DataAuditResult structures
// produced by specified Inner Ring node in specified epoch.
func Get(epoch int, peerID []byte) [][]byte {
	id := storageID(epoch, peerID)
	return GetByID(id)
}

// GetByID method returns list of all stable marshaled DataAuditResult with
// specified id. Use ListByEpoch method to obtain id.
func GetByID(id []byte) [][]byte {
	ctx := storage.GetReadOnlyContext()

	data := storage.Get(ctx, id)
	if data == nil {
		return [][]byte{}
	}

	return std.Deserialize(data.([]byte)).([][]byte)
}

// ListByEpoch returns list of IDs that may be used to get reputation data
// with GetByID method.
func ListByEpoch(epoch int) [][]byte {
	ctx := storage.GetReadOnlyContext()
	var buf interface{} = epoch
	it := storage.Find(ctx, buf.([]byte), storage.KeysOnly)

	var result [][]byte

	ignore := [][]byte{
		[]byte(notaryDisabledKey),
	}

loop:
	for iterator.Next(it) {
		key := iterator.Value(it).([]byte) // iterator MUST BE `storage.KeysOnly`
		for _, ignoreKey := range ignore {
			if common.BytesEqual(key, ignoreKey) {
				continue loop
			}
		}

		result = append(result, key)
	}

	return result
}

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

func storageID(epoch int, peerID []byte) []byte {
	var buf interface{} = epoch

	return append(buf.([]byte), peerID...)
}