package config

import (
	"fmt"
	"github.com/jessevdk/go-flags"
	"github.com/kaspanet/kaspad/dagconfig"
	"github.com/pkg/errors"
	"os"
)

// NetworkFlags holds the network configuration, that is which network is selected.
type NetworkFlags struct {
	Testnet         bool `long:"testnet" description:"Use the test network"`
	RegressionTest  bool `long:"regtest" description:"Use the regression test network"`
	Simnet          bool `long:"simnet" description:"Use the simulation test network"`
	Devnet          bool `long:"devnet" description:"Use the development test network"`
	ActiveNetParams *dagconfig.Params
}

// ResolveNetwork parses the network command line argument and sets NetParams accordingly.
// It returns error if more than one network was selected, nil otherwise.
func (networkFlags *NetworkFlags) ResolveNetwork(parser *flags.Parser) error {
	//NetParams holds the selected network parameters. Default value is main-net.
	networkFlags.ActiveNetParams = &dagconfig.MainnetParams
	// Multiple networks can't be selected simultaneously.
	numNets := 0
	// default net is main net
	// Count number of network flags passed; assign active network params
	// while we're at it
	if networkFlags.Testnet {
		numNets++
		networkFlags.ActiveNetParams = &dagconfig.TestnetParams
	}
	if networkFlags.RegressionTest {
		numNets++
		networkFlags.ActiveNetParams = &dagconfig.RegressionNetParams
	}
	if networkFlags.Simnet {
		numNets++
		networkFlags.ActiveNetParams = &dagconfig.SimnetParams
	}
	if networkFlags.Devnet {
		numNets++
		networkFlags.ActiveNetParams = &dagconfig.DevnetParams
	}
	if numNets > 1 {
		message := "Multiple networks parameters (testnet, simnet, devnet, etc.) cannot be used" +
			"together. Please choose only one network"
		err := errors.Errorf(message)
		fmt.Fprintln(os.Stderr, err)
		parser.WriteHelp(os.Stderr)
		return err
	}

	if numNets == 0 {
		message := "Mainnet has not launched yet, use --testnet to run in testnet mode"
		err := errors.Errorf(message)
		fmt.Fprintln(os.Stderr, err)
		return err
	}

	return nil
}

// NetParams returns the ActiveNetParams
func (networkFlags *NetworkFlags) NetParams() *dagconfig.Params {
	return networkFlags.ActiveNetParams
}