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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 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 library. If not, see
// <http://www.gnu.org/licenses/>.

package db

import (
    coreCommon "github.com/byzantine-lab/dexon-consensus/common"
    coreDKG "github.com/byzantine-lab/dexon-consensus/core/crypto/dkg"
    coreDb "github.com/byzantine-lab/dexon-consensus/core/db"
    coreTypes "github.com/byzantine-lab/dexon-consensus/core/types"

    "github.com/tangerine-network/go-tangerine/common"
    "github.com/tangerine-network/go-tangerine/core/rawdb"
    "github.com/tangerine-network/go-tangerine/ethdb"
)

// DB implement dexon-consensus BlockDatabase interface.
type DB struct {
    db ethdb.Database
}

func NewDatabase(db ethdb.Database) *DB {
    return &DB{db}
}

func (d *DB) HasBlock(hash coreCommon.Hash) bool {
    return rawdb.HasCoreBlock(d.db, common.Hash(hash))
}

func (d *DB) GetBlock(hash coreCommon.Hash) (coreTypes.Block, error) {
    block := rawdb.ReadCoreBlock(d.db, common.Hash(hash))
    if block == nil {
        return coreTypes.Block{}, coreDb.ErrBlockDoesNotExist
    }
    return *block, nil
}

func (d *DB) GetAllBlocks() (coreDb.BlockIterator, error) {
    return nil, coreDb.ErrNotImplemented
}

func (d *DB) UpdateBlock(block coreTypes.Block) error {
    if !d.HasBlock(block.Hash) {
        return coreDb.ErrBlockDoesNotExist
    }
    rawdb.WriteCoreBlock(d.db, common.Hash(block.Hash), &block)
    return nil
}

func (d *DB) PutBlock(block coreTypes.Block) error {
    if d.HasBlock(block.Hash) {
        return coreDb.ErrBlockExists
    }
    rawdb.WriteCoreBlock(d.db, common.Hash(block.Hash), &block)
    return nil
}

func (d *DB) GetDKGPrivateKey(round, reset uint64) (coreDKG.PrivateKey, error) {
    key := rawdb.ReadCoreDKGPrivateKey(d.db, round, reset)
    if key == nil {
        return coreDKG.PrivateKey{}, coreDb.ErrDKGPrivateKeyDoesNotExist
    }
    return *key, nil
}

func (d *DB) PutDKGPrivateKey(round, reset uint64, key coreDKG.PrivateKey) error {
    _, err := d.GetDKGPrivateKey(round, reset)
    if err == nil {
        return coreDb.ErrDKGPrivateKeyExists
    }
    if err != coreDb.ErrDKGPrivateKeyDoesNotExist {
        return err
    }

    return rawdb.WriteCoreDKGPrivateKey(d.db, round, reset, &key)
}

func (d *DB) PutCompactionChainTipInfo(hash coreCommon.Hash, height uint64) error {
    _, currentHeight := d.GetCompactionChainTipInfo()
    if height <= currentHeight {
        return coreDb.ErrInvalidCompactionChainTipHeight
    }
    return rawdb.WriteCoreCompactionChainTip(d.db, hash, height)
}

func (d *DB) GetCompactionChainTipInfo() (hash coreCommon.Hash, height uint64) {
    return rawdb.ReadCoreCompactionChainTip(d.db)
}

func (d *DB) PutOrUpdateDKGProtocol(
    protocol coreDb.DKGProtocolInfo) error {
    return rawdb.WriteCoreDKGProtocol(d.db, &protocol)
}

func (d *DB) GetDKGProtocol() (
    protocol coreDb.DKGProtocolInfo, err error) {
    dkgProtocol := rawdb.ReadCoreDKGProtocol(d.db)
    if dkgProtocol == nil {
        return coreDb.DKGProtocolInfo{}, coreDb.ErrDKGProtocolDoesNotExist
    }
    return *dkgProtocol, nil
}

func (d *DB) Close() error { return nil }