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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package abi

import (
    "math/big"
    "reflect"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/math"
)

var (
    big_t     = reflect.TypeOf(big.Int{})
    ubig_t    = reflect.TypeOf(big.Int{})
    byte_t    = reflect.TypeOf(byte(0))
    byte_ts   = reflect.TypeOf([]byte(nil))
    uint_t    = reflect.TypeOf(uint(0))
    uint8_t   = reflect.TypeOf(uint8(0))
    uint16_t  = reflect.TypeOf(uint16(0))
    uint32_t  = reflect.TypeOf(uint32(0))
    uint64_t  = reflect.TypeOf(uint64(0))
    int_t     = reflect.TypeOf(int(0))
    int8_t    = reflect.TypeOf(int8(0))
    int16_t   = reflect.TypeOf(int16(0))
    int32_t   = reflect.TypeOf(int32(0))
    int64_t   = reflect.TypeOf(int64(0))
    hash_t    = reflect.TypeOf(common.Hash{})
    address_t = reflect.TypeOf(common.Address{})

    uint_ts   = reflect.TypeOf([]uint(nil))
    uint8_ts  = reflect.TypeOf([]uint8(nil))
    uint16_ts = reflect.TypeOf([]uint16(nil))
    uint32_ts = reflect.TypeOf([]uint32(nil))
    uint64_ts = reflect.TypeOf([]uint64(nil))
    ubig_ts   = reflect.TypeOf([]*big.Int(nil))

    int_ts   = reflect.TypeOf([]int(nil))
    int8_ts  = reflect.TypeOf([]int8(nil))
    int16_ts = reflect.TypeOf([]int16(nil))
    int32_ts = reflect.TypeOf([]int32(nil))
    int64_ts = reflect.TypeOf([]int64(nil))
    big_ts   = reflect.TypeOf([]*big.Int(nil))
)

// U256 converts a big Int into a 256bit EVM number.
func U256(n *big.Int) []byte {
    return common.LeftPadBytes(math.U256(n).Bytes(), 32)
}

// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation
func packNum(value reflect.Value) []byte {
    switch kind := value.Kind(); kind {
    case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
        return U256(new(big.Int).SetUint64(value.Uint()))
    case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
        return U256(big.NewInt(value.Int()))
    case reflect.Ptr:
        return U256(value.Interface().(*big.Int))
    }
    return nil
}

// checks whether the given reflect value is signed. This also works for slices with a number type
func isSigned(v reflect.Value) bool {
    switch v.Type() {
    case int_ts, int8_ts, int16_ts, int32_ts, int64_ts, int_t, int8_t, int16_t, int32_t, int64_t:
        return true
    }
    return false
}