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package helper

import (
    "math/big"

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

type Env struct {
    state *state.State

    origin   []byte
    parent   []byte
    coinbase []byte

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

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

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

    env.origin = ethutil.Hex2Bytes(exeValues["caller"])
    env.parent = ethutil.Hex2Bytes(envValues["previousHash"])
    env.coinbase = ethutil.Hex2Bytes(envValues["currentCoinbase"])
    env.number = ethutil.Big(envValues["currentNumber"])
    env.time = ethutil.Big(envValues["currentTimestamp"]).Int64()
    env.difficulty = ethutil.Big(envValues["currentDifficulty"])
    env.gasLimit = ethutil.Big(envValues["currentGasLimit"])

    return env
}

func (self *Env) Origin() []byte        { return self.origin }
func (self *Env) BlockNumber() *big.Int { return self.number }
func (self *Env) PrevHash() []byte      { return self.parent }
func (self *Env) Coinbase() []byte      { return self.coinbase }
func (self *Env) Time() int64           { return self.time }
func (self *Env) Difficulty() *big.Int  { return self.difficulty }
func (self *Env) BlockHash() []byte     { return nil }
func (self *Env) State() *state.State   { return self.state }
func (self *Env) GasLimit() *big.Int    { return self.gasLimit }
func (self *Env) AddLog(*state.Log)     {}
func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
    return vm.Transfer(from, to, amount)
}

func RunVm(state *state.State, env, exec map[string]string) ([]byte, *big.Int, error) {
    address := FromHex(exec["address"])
    caller := state.GetOrNewStateObject(FromHex(exec["caller"]))

    evm := vm.New(NewEnvFromMap(state, env, exec), vm.DebugVmTy)
    execution := vm.NewExecution(evm, address, FromHex(exec["data"]), ethutil.Big(exec["gas"]), ethutil.Big(exec["gasPrice"]), ethutil.Big(exec["value"]))
    execution.SkipTransfer = true
    ret, err := execution.Exec(address, caller)

    return ret, execution.Gas, err
}

func RunState(state *state.State, env, tx map[string]string) ([]byte, *big.Int, error) {
    address := FromHex(tx["to"])
    keyPair, _ := crypto.NewKeyPairFromSec([]byte(ethutil.Hex2Bytes(tx["secretKey"])))
    caller := state.GetOrNewStateObject(keyPair.Address())

    vmenv := NewEnvFromMap(state, env, tx)
    vmenv.origin = caller.Address()
    evm := vm.New(vmenv, vm.DebugVmTy)
    execution := vm.NewExecution(evm, address, FromHex(tx["data"]), ethutil.Big(tx["gasLimit"]), ethutil.Big(tx["gasPrice"]), ethutil.Big(tx["value"]))
    ret, err := execution.Exec(address, caller)

    return ret, execution.Gas, err
}