package frontend

import (
	"net"

	"github.com/btcsuite/btcd/rpcclient"
	"github.com/pkg/errors"
	ini "gopkg.in/ini.v1"
)

func NewZRPCFromConf(confPath interface{}) (*rpcclient.Client, error) {
	connCfg, err := connFromConf(confPath)
	if err != nil {
		return nil, err
	}
	return rpcclient.New(connCfg, nil)
}

// If passed a string, interpret as a path, open and read; if passed
// a byte slice, interpret as the config file content (used in testing).
func connFromConf(confPath interface{}) (*rpcclient.ConnConfig, error) {
	cfg, err := ini.Load(confPath)
	if err != nil {
		return nil, errors.Wrap(err, "failed to read config file")
	}

	rpcaddr := cfg.Section("").Key("rpcbind").String()
	if rpcaddr == "" {
		rpcaddr = "127.0.0.1"
	}
	rpcport := cfg.Section("").Key("rpcport").String()
	if rpcport == "" {
		rpcport = "8232" // mainnet
	}
	username := cfg.Section("").Key("rpcuser").String()
	password := cfg.Section("").Key("rpcpassword").String()

	// Connect to local Zcash RPC server using HTTP POST mode.
	connCfg := &rpcclient.ConnConfig{
		Host:         net.JoinHostPort(rpcaddr, rpcport),
		User:         username,
		Pass:         password,
		HTTPPostMode: true, // Zcash only supports HTTP POST mode
		DisableTLS:   true, // Zcash does not provide TLS by default
	}
	// Notice the notification parameter is nil since notifications are
	// not supported in HTTP POST mode.
	return connCfg, nil
}