package context

import (
	tcmd "github.com/tendermint/tendermint/cmd/tendermint/commands"
	tmtypes "github.com/tendermint/tendermint/types"
)

// defaultChainID returns the chain ID from the genesis file if present. An
// error is returned if the file cannot be read or parsed.
//
// TODO: This should be removed and the chainID should always be provided by
// the end user.
func defaultChainID() (string, error) {
	cfg, err := tcmd.ParseConfig()
	if err != nil {
		return "", err
	}

	doc, err := tmtypes.GenesisDocFromFile(cfg.GenesisFile())
	if err != nil {
		return "", err
	}

	return doc.ChainID, nil
}