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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus-core library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.

package test

import (
    "fmt"
    "sync"
    "time"

    "github.com/dexon-foundation/dexon-consensus-core/common"
    "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
    "github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
    "github.com/dexon-foundation/dexon-consensus-core/core/types"
)

var (
    // ErrPrivateKeyNotExists means caller request private key for an
    // unknown node ID.
    ErrPrivateKeyNotExists = fmt.Errorf("private key not exists")
)

// Governance is an implementation of Goverance for testing purpose.
type Governance struct {
    lambdaBA           time.Duration
    lambdaDKG          time.Duration
    privateKeys        map[types.NodeID]crypto.PrivateKey
    crs                map[uint64]common.Hash
    tsig               map[uint64]crypto.Signature
    DKGComplaint       map[uint64][]*types.DKGComplaint
    DKGMasterPublicKey map[uint64][]*types.DKGMasterPublicKey
    RoundInterval      time.Duration
    MinBlockInterval   time.Duration
    MaxBlockInterval   time.Duration
    lock               sync.RWMutex
}

// NewGovernance constructs a Governance instance.
func NewGovernance(nodeCount int, lambda time.Duration) (
    g *Governance, err error) {
    hashCRS := crypto.Keccak256Hash([]byte("__ DEXON"))
    g = &Governance{
        lambdaBA:           lambda,
        lambdaDKG:          lambda * 10,
        privateKeys:        make(map[types.NodeID]crypto.PrivateKey),
        crs:                map[uint64]common.Hash{0: hashCRS},
        tsig:               make(map[uint64]crypto.Signature),
        DKGComplaint:       make(map[uint64][]*types.DKGComplaint),
        DKGMasterPublicKey: make(map[uint64][]*types.DKGMasterPublicKey),
        RoundInterval:      365 * 86400 * time.Second,
        MinBlockInterval:   lambda * 3,
        MaxBlockInterval:   lambda * 8,
    }
    for i := 0; i < nodeCount; i++ {
        prv, err := ecdsa.NewPrivateKey()
        if err != nil {
            return nil, err
        }
        nID := types.NewNodeID(prv.PublicKey())
        g.privateKeys[nID] = prv
    }
    return
}

// GetNodeSet implements Governance interface to return current
// notary set.
func (g *Governance) GetNodeSet(_ uint64) (
    ret []crypto.PublicKey) {
    for _, key := range g.privateKeys {
        ret = append(ret, key.PublicKey())
    }
    return
}

// GetConfiguration returns the configuration at a given block height.
func (g *Governance) GetConfiguration(_ uint64) *types.Config {
    return &types.Config{
        NumShards:        1,
        NumChains:        uint32(len(g.privateKeys)),
        LambdaBA:         g.lambdaBA,
        LambdaDKG:        g.lambdaDKG,
        K:                0,
        PhiRatio:         0.667,
        NumNotarySet:     len(g.privateKeys),
        NumWitnessSet:    len(g.privateKeys),
        NumDKGSet:        len(g.privateKeys),
        RoundInterval:    g.RoundInterval,
        MinBlockInterval: g.MinBlockInterval,
        MaxBlockInterval: g.MaxBlockInterval,
    }
}

// GetCRS returns the CRS for a given round.
func (g *Governance) GetCRS(round uint64) common.Hash {
    return g.crs[round]
}

// ProposeCRS propose a CRS.
func (g *Governance) ProposeCRS(round uint64, crs []byte) {
    g.crs[round] = crypto.Keccak256Hash(crs)
}

// GetPrivateKeys return the private key for that node, this function
// is a test utility and not a general Governance interface.
func (g *Governance) GetPrivateKeys() (keys []crypto.PrivateKey) {
    for _, k := range g.privateKeys {
        keys = append(keys, k)
    }
    return
}

// ProposeThresholdSignature porposes a ThresholdSignature of round.
func (g *Governance) ProposeThresholdSignature(
    round uint64, signature crypto.Signature) {
    g.lock.Lock()
    defer g.lock.Unlock()
    g.tsig[round] = signature
}

// GetThresholdSignature gets a ThresholdSignature of round.
func (g *Governance) GetThresholdSignature(round uint64) (
    sig crypto.Signature, exist bool) {
    g.lock.RLock()
    defer g.lock.RUnlock()
    sig, exist = g.tsig[round]
    return
}

// AddDKGComplaint add a DKGComplaint.
func (g *Governance) AddDKGComplaint(complaint *types.DKGComplaint) {
    g.lock.Lock()
    defer g.lock.Unlock()
    g.DKGComplaint[complaint.Round] = append(g.DKGComplaint[complaint.Round],
        complaint)
}

// DKGComplaints returns the DKGComplaints of round.
func (g *Governance) DKGComplaints(round uint64) []*types.DKGComplaint {
    g.lock.RLock()
    defer g.lock.RUnlock()
    complaints, exist := g.DKGComplaint[round]
    if !exist {
        return []*types.DKGComplaint{}
    }
    return complaints
}

// AddDKGMasterPublicKey adds a DKGMasterPublicKey.
func (g *Governance) AddDKGMasterPublicKey(
    masterPublicKey *types.DKGMasterPublicKey) {
    g.lock.Lock()
    defer g.lock.Unlock()
    g.DKGMasterPublicKey[masterPublicKey.Round] = append(
        g.DKGMasterPublicKey[masterPublicKey.Round], masterPublicKey)
}

// DKGMasterPublicKeys returns the DKGMasterPublicKeys of round.
func (g *Governance) DKGMasterPublicKeys(
    round uint64) []*types.DKGMasterPublicKey {
    g.lock.RLock()
    defer g.lock.RUnlock()
    masterPublicKeys, exist := g.DKGMasterPublicKey[round]
    if !exist {
        return []*types.DKGMasterPublicKey{}
    }
    return masterPublicKeys
}