package simulation_test

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	sdkmath "cosmossdk.io/math"
	"cosmossdk.io/x/bank/simulation"
	"cosmossdk.io/x/bank/types"

	"github.com/cosmos/cosmos-sdk/codec"
	"github.com/cosmos/cosmos-sdk/codec/testutil"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
)

// TestRandomizedGenState tests the normal scenario of applying RandomizedGenState.
// Abonormal scenarios are not tested here.
func TestRandomizedGenState(t *testing.T) {
	interfaceRegistry := codectypes.NewInterfaceRegistry()
	cdc := codec.NewProtoCodec(interfaceRegistry)
	cdcOpts := testutil.CodecOptions{}
	s := rand.NewSource(1)
	r := rand.New(s)

	simState := module.SimulationState{
		AppParams:      make(simtypes.AppParams),
		Cdc:            cdc,
		AddressCodec:   cdcOpts.GetAddressCodec(),
		ValidatorCodec: cdcOpts.GetValidatorCodec(),
		Rand:           r,
		NumBonded:      3,
		BondDenom:      sdk.DefaultBondDenom,
		Accounts:       simtypes.RandomAccounts(r, 3),
		InitialStake:   sdkmath.NewInt(1000),
		GenState:       make(map[string]json.RawMessage),
	}

	simulation.RandomizedGenState(&simState)

	var bankGenesis types.GenesisState
	simState.Cdc.MustUnmarshalJSON(simState.GenState[types.ModuleName], &bankGenesis)

	assert.Equal(t, true, bankGenesis.Params.GetDefaultSendEnabled(), "Params.GetDefaultSendEnabled")
	assert.Len(t, bankGenesis.Params.GetSendEnabled(), 0, "Params.GetSendEnabled") //nolint:staticcheck // we're testing the old way here
	if assert.Len(t, bankGenesis.Balances, 3) {
		assert.Equal(t, "cosmos1ghekyjucln7y67ntx7cf27m9dpuxxemn4c8g4r", bankGenesis.Balances[2].Address, "Balances[2] address")
		assert.Equal(t, "1000stake", bankGenesis.Balances[2].GetCoins().String(), "Balances[2] coins")
	}
	assert.Equal(t, "6000stake", bankGenesis.Supply.String(), "Supply")
	if assert.Len(t, bankGenesis.SendEnabled, 1, "SendEnabled") {
		assert.Equal(t, true, bankGenesis.SendEnabled[0].Enabled, "SendEnabled[0] value")
	}
}

// TestRandomizedGenState1 tests abnormal scenarios of applying RandomizedGenState.
func TestRandomizedGenState1(t *testing.T) {
	interfaceRegistry := codectypes.NewInterfaceRegistry()
	cdc := codec.NewProtoCodec(interfaceRegistry)

	s := rand.NewSource(1)
	r := rand.New(s)

	// all these tests will panic
	tests := []struct {
		simState module.SimulationState
		panicMsg string
	}{
		{ // panic => reason: incomplete initialization of the simState
			module.SimulationState{}, "invalid memory address or nil pointer dereference"},
		{ // panic => reason: incomplete initialization of the simState
			module.SimulationState{
				AppParams: make(simtypes.AppParams),
				Cdc:       cdc,
				Rand:      r,
			}, "assignment to entry in nil map"},
	}

	for _, tt := range tests {
		require.Panicsf(t, func() { simulation.RandomizedGenState(&tt.simState) }, tt.panicMsg)
	}
}