package simulation_test

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

	"github.com/stretchr/testify/require"

	sdkmath "cosmossdk.io/math"

	"git.cw.tr/mukan-network/mukan-sdk/codec"
	codectypes "git.cw.tr/mukan-network/mukan-sdk/codec/types"
	cryptocodec "git.cw.tr/mukan-network/mukan-sdk/crypto/codec"
	"git.cw.tr/mukan-network/mukan-sdk/types/module"
	simtypes "git.cw.tr/mukan-network/mukan-sdk/types/simulation"

	"git.cw.tr/mukan-network/mukan-ibc/modules/apps/transfer/simulation"
	"git.cw.tr/mukan-network/mukan-ibc/modules/apps/transfer/types"
)

// TestRandomizedGenState tests the normal scenario of applying RandomizedGenState.
// Abonormal scenarios are not tested here.
func TestRandomizedGenState(t *testing.T) {
	interfaceRegistry := codectypes.NewInterfaceRegistry()
	cryptocodec.RegisterInterfaces(interfaceRegistry)
	cdc := codec.NewProtoCodec(interfaceRegistry)

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

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

	simulation.RandomizedGenState(&simState)

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

	require.Equal(t, "euzxpfgkqegqiqwixnku", ibcTransferGenesis.PortId)
	require.True(t, ibcTransferGenesis.Params.SendEnabled)
	require.True(t, ibcTransferGenesis.Params.ReceiveEnabled)
	require.Len(t, ibcTransferGenesis.Denoms, 0)
}

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

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			require.Panicsf(t, func() { simulation.RandomizedGenState(&tc.simState) }, tc.panicMsg)
		})
	}
}
