package simulation

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

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

	"github.com/tharsis/ethermint/x/evm/types"
)

const (
	extraEIPsKey = "extra_eips"
)

// GenExtraEIPs defines a set of extra EIPs with 50% probability
func GenExtraEIPs(r *rand.Rand) []int64 {
	var extraEIPs []int64
	// 50% chance of having extra EIPs
	if r.Intn(2) == 0 {
		extraEIPs = []int64{1344, 1884, 2200, 2929, 3198, 3529}
	}
	return extraEIPs
}

// GenEnableCreate enables the EnableCreate param with 80% probability
func GenEnableCreate(r *rand.Rand) bool {
	// 80% chance of enabling create contract
	enableCreate := r.Intn(100) < 80
	return enableCreate
}

// GenEnableCall enables the EnableCall param with 80% probability
func GenEnableCall(r *rand.Rand) bool {
	// 80% chance of enabling evm account transfer and calling contract
	enableCall := r.Intn(100) < 80
	return enableCall
}

// RandomizedGenState generates a random GenesisState for the EVM module
func RandomizedGenState(simState *module.SimulationState) {
	// evm params
	var extraEIPs []int64

	simState.AppParams.GetOrGenerate(
		simState.Cdc, extraEIPsKey, &extraEIPs, simState.Rand,
		func(r *rand.Rand) { extraEIPs = GenExtraEIPs(r) },
	)

	params := types.NewParams(types.DefaultEVMDenom, true, true, types.DefaultChainConfig(), types.DefaultMinGasMultiplier, extraEIPs...)
	evmGenesis := types.NewGenesisState(params, []types.GenesisAccount{})

	bz, err := json.MarshalIndent(evmGenesis, "", " ")
	if err != nil {
		panic(err)
	}
	fmt.Printf("Selected randomly generated %s parameters:\n%s\n", types.ModuleName, bz)

	simState.GenState[types.ModuleName] = simState.Cdc.MustMarshalJSON(evmGenesis)
}