package smartconfig

import (
	"fmt"

	"github.com/hashicorp/consul/api"
)

// ConsulResolver retrieves values from Consul KV store.
// Usage: ${CONSUL:myapp/config/database}
type ConsulResolver struct{}

// Resolve retrieves the value from Consul.
func (r *ConsulResolver) Resolve(value string) (string, error) {
	config := api.DefaultConfig()
	client, err := api.NewClient(config)
	if err != nil {
		return "", fmt.Errorf("failed to create Consul client: %w", err)
	}

	kv := client.KV()
	pair, _, err := kv.Get(value, nil)
	if err != nil {
		return "", fmt.Errorf("failed to get key %s from Consul: %w", value, err)
	}

	if pair == nil {
		return "", fmt.Errorf("key %s not found in Consul", value)
	}

	return string(pair.Value), nil
}