package auth

import (
	"context"
	"fmt"
	"os"
	"time"

	"github.com/Blankcut/kubernetes-mcp-server/kubernetes-claude-mcp/pkg/logging"
)

// TODO: Implement the VaultManager
// VaultManager handles access to HashiCorp Vault for secrets management
// This is a simplified version for the example - in a real implementation,
// you would use the official Vault client library
type VaultManager struct {
	logger     *logging.Logger
	vaultAddr  string
	vaultToken string
	available  bool
}

// NewVaultManager creates a new Vault manager
func NewVaultManager(logger *logging.Logger) *VaultManager {
	if logger == nil {
		logger = logging.NewLogger().Named("vault")
	}
	
	// Check for Vault environment variables
	vaultAddr := os.Getenv("VAULT_ADDR")
	vaultToken := os.Getenv("VAULT_TOKEN")
	
	// Determine if Vault is available
	available := vaultAddr != "" && vaultToken != ""
	
	if !available {
		logger.Warn("Vault not configured", "vaultAddr", vaultAddr != "")
	} else {
		logger.Info("Vault configured", "address", vaultAddr)
	}
	
	return &VaultManager{
		logger:     logger,
		vaultAddr:  vaultAddr,
		vaultToken: vaultToken,
		available:  available,
	}
}

// IsAvailable returns true if Vault is available
func (vm *VaultManager) IsAvailable() bool {
	return vm.available
}

// GetCredentials retrieves credentials for a service from Vault
func (vm *VaultManager) GetCredentials(ctx context.Context, service string) (*Credentials, error) {
	if !vm.available {
		return nil, fmt.Errorf("Vault not available")
	}
	
	// We need to use the Vault API to get credentials
	// For now, this is just a placeholder
	vm.logger.Debug("Getting credentials from Vault", "service", service)
	
	// For the example, we'll simulate a Vault lookup by service
	// This should be an API call to Vault
	switch service {
	case "argocd":
		// Simulated ArgoCD credentials from Vault
		return &Credentials{
			Token:     "vault-managed-argocd-token",
			ExpiresAt: time.Now().Add(24 * time.Hour),
		}, nil
		
	case "gitlab":
		return &Credentials{
			Token: "vault-managed-gitlab-token",
		}, nil
		
	case "claude":
		return &Credentials{
			APIKey: "vault-managed-claude-api-key",
		}, nil
		
	default:
		return nil, fmt.Errorf("no credentials found in Vault for service: %s", service)
	}
}

// SaveCredentials saves credentials for a service to Vault
func (vm *VaultManager) SaveCredentials(ctx context.Context, service string, creds *Credentials) error {
	if !vm.available {
		return fmt.Errorf("Vault not available")
	}
	
	// This needs to use the Vault API to store credentials
	// For now, this is just a placeholder
	vm.logger.Debug("Saving credentials to Vault", "service", service)
	
	return nil
}