// Package accounts loads the payment-account registry from config. Credentials
// never live in the config file — only an env-var prefix is stored; the real
// secret is read from the environment at call time.
package accounts

import (
	"os"
	"strings"

	"github.com/wangjia/pay/config"
)

type Registry struct{ accts []config.AccountConfig }

func New(accts []config.AccountConfig) *Registry { return &Registry{accts: accts} }

// EnabledFor returns enabled accounts for a channel (+region if non-empty).
func (r *Registry) EnabledFor(channel, region string) []config.AccountConfig {
	var out []config.AccountConfig
	for _, a := range r.accts {
		if a.Channel != channel || !a.Enabled {
			continue
		}
		if region != "" && a.Region != "" && a.Region != region {
			continue
		}
		out = append(out, a)
	}
	return out
}

// Credential reads <CredentialEnvPrefix>_<KEY> from the environment.
func (r *Registry) Credential(accountID, key string) string {
	for _, a := range r.accts {
		if a.AccountID == accountID {
			return os.Getenv(strings.ToUpper(a.CredentialEnvPrefix + "_" + key))
		}
	}
	return ""
}