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package helper

import (
    "errors"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/crypto"
)

type Env struct {
    depth        int
    state        *state.StateDB
    skipTransfer bool
    initial      bool
    Gas          *big.Int

    origin common.Address
    //parent   common.Hash
    coinbase common.Address

    number     *big.Int
    time       int64
    difficulty *big.Int
    gasLimit   *big.Int

    logs state.Logs

    vmTest bool
}

func NewEnv(state *state.StateDB) *Env {
    return &Env{
        state: state,
    }
}

func NewEnvFromMap(state *state.StateDB, envValues map[string]string, exeValues map[string]string) *Env {
    env := NewEnv(state)

    env.origin = common.HexToAddress(exeValues["caller"])
    //env.parent = common.Hex2Bytes(envValues["previousHash"])
    env.coinbase = common.HexToAddress(envValues["currentCoinbase"])
    env.number = common.Big(envValues["currentNumber"])
    env.time = common.Big(envValues["currentTimestamp"]).Int64()
    env.difficulty = common.Big(envValues["currentDifficulty"])
    env.gasLimit = common.Big(envValues["currentGasLimit"])
    env.Gas = new(big.Int)

    return env
}

func (self *Env) Origin() common.Address { return self.origin }
func (self *Env) BlockNumber() *big.Int  { return self.number }

//func (self *Env) PrevHash() []byte      { return self.parent }
func (self *Env) Coinbase() common.Address { return self.coinbase }
func (self *Env) Time() int64              { return self.time }
func (self *Env) Difficulty() *big.Int     { return self.difficulty }
func (self *Env) State() *state.StateDB    { return self.state }
func (self *Env) GasLimit() *big.Int       { return self.gasLimit }
func (self *Env) VmType() vm.Type          { return vm.StdVmTy }
func (self *Env) GetHash(n uint64) common.Hash {
    return common.BytesToHash(crypto.Sha3([]byte(big.NewInt(int64(n)).String())))
}
func (self *Env) AddLog(log state.Log) {
    self.logs = append(self.logs, log)
}
func (self *Env) Depth() int     { return self.depth }
func (self *Env) SetDepth(i int) { self.depth = i }
func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
    if self.skipTransfer {
        // ugly hack
        if self.initial {
            self.initial = false
            return nil
        }

        if from.Balance().Cmp(amount) < 0 {
            return errors.New("Insufficient balance in account")
        }

        return nil
    }
    return vm.Transfer(from, to, amount)
}

func (self *Env) vm(addr *common.Address, data []byte, gas, price, value *big.Int) *core.Execution {
    exec := core.NewExecution(self, addr, data, gas, price, value)

    return exec
}

func (self *Env) Call(caller vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
    if self.vmTest && self.depth > 0 {
        caller.ReturnGas(gas, price)

        return nil, nil
    }
    exe := self.vm(&addr, data, gas, price, value)
    ret, err := exe.Call(addr, caller)
    self.Gas = exe.Gas

    return ret, err

}
func (self *Env) CallCode(caller vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
    if self.vmTest && self.depth > 0 {
        caller.ReturnGas(gas, price)

        return nil, nil
    }

    caddr := caller.Address()
    exe := self.vm(&caddr, data, gas, price, value)
    return exe.Call(addr, caller)
}

func (self *Env) Create(caller vm.ContextRef, addr *common.Address, data []byte, gas, price, value *big.Int) ([]byte, error, vm.ContextRef) {
    exe := self.vm(addr, data, gas, price, value)
    if self.vmTest {
        caller.ReturnGas(gas, price)

        nonce := self.state.GetNonce(caller.Address())
        obj := self.state.GetOrNewStateObject(crypto.CreateAddress(caller.Address(), nonce))

        return nil, nil, obj
    } else {
        return exe.Create(caller)
    }
}

func RunVm(state *state.StateDB, env, exec map[string]string) ([]byte, state.Logs, *big.Int, error) {
    var (
        to    = common.HexToAddress(exec["address"])
        from  = common.HexToAddress(exec["caller"])
        data  = FromHex(exec["data"])
        gas   = common.Big(exec["gas"])
        price = common.Big(exec["gasPrice"])
        value = common.Big(exec["value"])
    )
    // Reset the pre-compiled contracts for VM tests.
    vm.Precompiled = make(map[string]*vm.PrecompiledAccount)

    caller := state.GetOrNewStateObject(from)

    vmenv := NewEnvFromMap(state, env, exec)
    vmenv.vmTest = true
    vmenv.skipTransfer = true
    vmenv.initial = true
    ret, err := vmenv.Call(caller, to, data, gas, price, value)

    return ret, vmenv.logs, vmenv.Gas, err
}

func RunState(statedb *state.StateDB, env, tx map[string]string) ([]byte, state.Logs, *big.Int, error) {
    var (
        keyPair, _ = crypto.NewKeyPairFromSec([]byte(common.Hex2Bytes(tx["secretKey"])))
        data       = FromHex(tx["data"])
        gas        = common.Big(tx["gasLimit"])
        price      = common.Big(tx["gasPrice"])
        value      = common.Big(tx["value"])
        caddr      = common.HexToAddress(env["currentCoinbase"])
    )

    var to *common.Address
    if len(tx["to"]) > 2 {
        t := common.HexToAddress(tx["to"])
        to = &t
    }
    // Set pre compiled contracts
    vm.Precompiled = vm.PrecompiledContracts()

    snapshot := statedb.Copy()
    coinbase := statedb.GetOrNewStateObject(caddr)
    coinbase.SetGasPool(common.Big(env["currentGasLimit"]))

    message := NewMessage(common.BytesToAddress(keyPair.Address()), to, data, value, gas, price)
    vmenv := NewEnvFromMap(statedb, env, tx)
    vmenv.origin = common.BytesToAddress(keyPair.Address())
    ret, _, err := core.ApplyMessage(vmenv, message, coinbase)
    if core.IsNonceErr(err) || core.IsInvalidTxErr(err) {
        statedb.Set(snapshot)
    }
    statedb.Update(vmenv.Gas)

    return ret, vmenv.logs, vmenv.Gas, err
}

type Message struct {
    from              common.Address
    to                *common.Address
    value, gas, price *big.Int
    data              []byte
}

func NewMessage(from common.Address, to *common.Address, data []byte, value, gas, price *big.Int) Message {
    return Message{from, to, value, gas, price, data}
}

func (self Message) Hash() []byte                  { return nil }
func (self Message) From() (common.Address, error) { return self.from, nil }
func (self Message) To() *common.Address           { return self.to }
func (self Message) GasPrice() *big.Int            { return self.price }
func (self Message) Gas() *big.Int                 { return self.gas }
func (self Message) Value() *big.Int               { return self.value }
func (self Message) Nonce() uint64                 { return 0 }
func (self Message) Data() []byte                  { return self.data }