package types_test

import (
	"encoding/hex"
	"math/rand"
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/tendermint/tendermint/crypto/ed25519"

	"strings"

	"github.com/cosmos/cosmos-sdk/types"
)

var invalidStrs = []string{
	"",
	"hello, world!",
	"0xAA",
	"AAA",
	types.Bech32PrefixAccAddr + "AB0C",
	types.Bech32PrefixAccPub + "1234",
	types.Bech32PrefixValAddr + "5678",
	types.Bech32PrefixValPub + "BBAB",
	types.Bech32PrefixConsAddr + "FF04",
	types.Bech32PrefixConsPub + "6789",
}

func testMarshal(t *testing.T, original interface{}, res interface{}, marshal func() ([]byte, error), unmarshal func([]byte) error) {
	bz, err := marshal()
	require.Nil(t, err)
	err = unmarshal(bz)
	require.Nil(t, err)
	require.Equal(t, original, res)
}

func TestRandBech32PubkeyConsistency(t *testing.T) {
	var pub ed25519.PubKeyEd25519

	for i := 0; i < 1000; i++ {
		rand.Read(pub[:])

		mustBech32AccPub := types.MustBech32ifyAccPub(pub)
		bech32AccPub, err := types.Bech32ifyAccPub(pub)
		require.Nil(t, err)
		require.Equal(t, bech32AccPub, mustBech32AccPub)

		mustBech32ValPub := types.MustBech32ifyValPub(pub)
		bech32ValPub, err := types.Bech32ifyValPub(pub)
		require.Nil(t, err)
		require.Equal(t, bech32ValPub, mustBech32ValPub)

		mustBech32ConsPub := types.MustBech32ifyConsPub(pub)
		bech32ConsPub, err := types.Bech32ifyConsPub(pub)
		require.Nil(t, err)
		require.Equal(t, bech32ConsPub, mustBech32ConsPub)

		mustAccPub := types.MustGetAccPubKeyBech32(bech32AccPub)
		accPub, err := types.GetAccPubKeyBech32(bech32AccPub)
		require.Nil(t, err)
		require.Equal(t, accPub, mustAccPub)

		mustValPub := types.MustGetValPubKeyBech32(bech32ValPub)
		valPub, err := types.GetValPubKeyBech32(bech32ValPub)
		require.Nil(t, err)
		require.Equal(t, valPub, mustValPub)

		mustConsPub := types.MustGetConsPubKeyBech32(bech32ConsPub)
		consPub, err := types.GetConsPubKeyBech32(bech32ConsPub)
		require.Nil(t, err)
		require.Equal(t, consPub, mustConsPub)

		require.Equal(t, valPub, accPub)
		require.Equal(t, valPub, consPub)
	}
}

func TestRandBech32AccAddrConsistency(t *testing.T) {
	var pub ed25519.PubKeyEd25519

	for i := 0; i < 1000; i++ {
		rand.Read(pub[:])

		acc := types.AccAddress(pub.Address())
		res := types.AccAddress{}

		testMarshal(t, &acc, &res, acc.MarshalJSON, (&res).UnmarshalJSON)
		testMarshal(t, &acc, &res, acc.Marshal, (&res).Unmarshal)

		str := acc.String()
		res, err := types.AccAddressFromBech32(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)

		str = hex.EncodeToString(acc)
		res, err = types.AccAddressFromHex(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)
	}

	for _, str := range invalidStrs {
		_, err := types.AccAddressFromHex(str)
		require.NotNil(t, err)

		_, err = types.AccAddressFromBech32(str)
		require.NotNil(t, err)

		err = (*types.AccAddress)(nil).UnmarshalJSON([]byte("\"" + str + "\""))
		require.NotNil(t, err)
	}
}

func TestValAddr(t *testing.T) {
	var pub ed25519.PubKeyEd25519

	for i := 0; i < 20; i++ {
		rand.Read(pub[:])

		acc := types.ValAddress(pub.Address())
		res := types.ValAddress{}

		testMarshal(t, &acc, &res, acc.MarshalJSON, (&res).UnmarshalJSON)
		testMarshal(t, &acc, &res, acc.Marshal, (&res).Unmarshal)

		str := acc.String()
		res, err := types.ValAddressFromBech32(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)

		str = hex.EncodeToString(acc)
		res, err = types.ValAddressFromHex(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)
	}

	for _, str := range invalidStrs {
		_, err := types.ValAddressFromHex(str)
		require.NotNil(t, err)

		_, err = types.ValAddressFromBech32(str)
		require.NotNil(t, err)

		err = (*types.ValAddress)(nil).UnmarshalJSON([]byte("\"" + str + "\""))
		require.NotNil(t, err)
	}
}

func TestConsAddress(t *testing.T) {
	var pub ed25519.PubKeyEd25519

	for i := 0; i < 20; i++ {
		rand.Read(pub[:])

		acc := types.ConsAddress(pub.Address())
		res := types.ConsAddress{}

		testMarshal(t, &acc, &res, acc.MarshalJSON, (&res).UnmarshalJSON)
		testMarshal(t, &acc, &res, acc.Marshal, (&res).Unmarshal)

		str := acc.String()
		res, err := types.ConsAddressFromBech32(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)

		str = hex.EncodeToString(acc)
		res, err = types.ConsAddressFromHex(str)
		require.Nil(t, err)
		require.Equal(t, acc, res)
	}

	for _, str := range invalidStrs {
		_, err := types.ConsAddressFromHex(str)
		require.NotNil(t, err)

		_, err = types.ConsAddressFromBech32(str)
		require.NotNil(t, err)

		err = (*types.ConsAddress)(nil).UnmarshalJSON([]byte("\"" + str + "\""))
		require.NotNil(t, err)
	}
}

const letterBytes = "abcdefghijklmnopqrstuvwxyz"

func RandString(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = letterBytes[rand.Intn(len(letterBytes))]
	}
	return string(b)
}

func TestConfiguredPrefix(t *testing.T) {
	var pub ed25519.PubKeyEd25519
	for length := 1; length < 10; length++ {
		for times := 1; times < 20; times++ {
			rand.Read(pub[:])
			// Test if randomly generated prefix of a given length works
			prefix := RandString(length)
			// Assuming that GetConfig is not sealed.
			config := types.GetConfig()
			config.SetBech32PrefixForAccount(prefix+"acc", prefix+"pub")
			acc := types.AccAddress(pub.Address())
			require.True(t, strings.HasPrefix(acc.String(), prefix+"acc"))
			bech32Pub := types.MustBech32ifyAccPub(pub)
			require.True(t, strings.HasPrefix(bech32Pub, prefix+"pub"))

			config.SetBech32PrefixForValidator(prefix+"valaddr", prefix+"valpub")
			val := types.ValAddress(pub.Address())
			require.True(t, strings.HasPrefix(val.String(), prefix+"valaddr"))
			bech32ValPub := types.MustBech32ifyValPub(pub)
			require.True(t, strings.HasPrefix(bech32ValPub, prefix+"valpub"))

			config.SetBech32PrefixForConsensusNode(prefix+"consaddr", prefix+"conspub")
			cons := types.ConsAddress(pub.Address())
			require.True(t, strings.HasPrefix(cons.String(), prefix+"consaddr"))
			bech32ConsPub := types.MustBech32ifyConsPub(pub)
			require.True(t, strings.HasPrefix(bech32ConsPub, prefix+"conspub"))
		}

	}
}