package handlers

import (
	"byom-infra-api/config"
	"encoding/json"
	"log"
	"net/http"

	"github.com/gorilla/mux"
)

type SSHKey struct {
	KeyName string `json:"keyName"`
	Key     string `json:"key"`
}

type SSHKeyHandler struct{}

func NewSSHKeyHandler() *SSHKeyHandler {
	return &SSHKeyHandler{}
}

// GetSSHKeys handles the retrieval of all SSH keys
func (h *SSHKeyHandler) GetSSHKeys(w http.ResponseWriter, r *http.Request) {
	log.Printf("Handling GET request for all SSH keys from %s", r.RemoteAddr)

	// First, get the list of SSH key IDs
	var keyIDs []string
	err := config.OVHClient.Get("/me/sshKey", &keyIDs)
	if err != nil {
		log.Printf("Error fetching SSH key IDs: %v", err)
		http.Error(w, "Failed to fetch SSH keys: "+err.Error(), http.StatusInternalServerError)
		return
	}

	// Then fetch details for each key
	var sshKeys []SSHKey
	for _, id := range keyIDs {
		var key SSHKey
		err := config.OVHClient.Get("/me/sshKey/"+id, &key)
		if err != nil {
			log.Printf("Error fetching details for SSH key %s: %v", id, err)
			continue
		}
		sshKeys = append(sshKeys, key)
	}

	log.Printf("Successfully retrieved %d SSH keys", len(sshKeys))

	w.Header().Set("Content-Type", "application/json")
	if err := json.NewEncoder(w).Encode(sshKeys); err != nil {
		log.Printf("Error encoding SSH keys response: %v", err)
		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
		return
	}
}

// GetSSHKeyByID handles the retrieval of a specific SSH key by ID
func (h *SSHKeyHandler) GetSSHKeyByID(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	keyID := vars["id"]
	log.Printf("Handling GET request for SSH key ID: %s from %s", keyID, r.RemoteAddr)

	var sshKey SSHKey
	err := config.OVHClient.Get("/me/sshKey/"+keyID, &sshKey)
	if err != nil {
		log.Printf("Error fetching SSH key %s: %v", keyID, err)
		http.Error(w, "Failed to fetch SSH key: "+err.Error(), http.StatusInternalServerError)
		return
	}

	log.Printf("Successfully retrieved SSH key: %s", keyID)

	w.Header().Set("Content-Type", "application/json")
	if err := json.NewEncoder(w).Encode(sshKey); err != nil {
		log.Printf("Error encoding SSH key response: %v", err)
		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
		return
	}
}

// CreateSSHKey handles the creation of a new SSH key
func (h *SSHKeyHandler) CreateSSHKey(w http.ResponseWriter, r *http.Request) {
	log.Printf("Handling POST request for new SSH key from %s", r.RemoteAddr)

	// Parse request body
	var newKey struct {
		KeyName string `json:"keyName"`
		Key     string `json:"key"`
	}

	if err := json.NewDecoder(r.Body).Decode(&newKey); err != nil {
		log.Printf("Error decoding request body: %v", err)
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	// Validate input
	if newKey.KeyName == "" || newKey.Key == "" {
		log.Printf("Invalid input: keyName or key is empty")
		http.Error(w, "KeyName and Key are required", http.StatusBadRequest)
		return
	}

	// Prepare creation payload
	sshKey := SSHKey{
		KeyName: newKey.KeyName,
		Key:     newKey.Key,
	}

	// Create SSH key via OVH API
	err := config.OVHClient.Post("/me/sshKey", sshKey, &sshKey)
	if err != nil {
		log.Printf("Error creating SSH key: %v", err)
		http.Error(w, "Failed to create SSH key: "+err.Error(), http.StatusInternalServerError)
		return
	}

	log.Printf("Successfully created SSH key: %s", sshKey.KeyName)

	// Return created key details
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	if err := json.NewEncoder(w).Encode(sshKey); err != nil {
		log.Printf("Error encoding response: %v", err)
		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
		return
	}
}

// // GenerateED25519Key generates a new ED25519 SSH key pair and returns public and private keys
// func GenerateED25519Key(keyName string) (string, string, error) {
// 	// Generate the key pair
// 	pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
// 	if err != nil {
// 		return "", "", fmt.Errorf("failed to generate ED25519 key: %v", err)
// 	}

// 	// Convert to OpenSSH format
// 	// ED25519 public key format: ssh-ed25519 <base64-encoded-public-key> <comment>
// 	publicKeyStr := "ssh-ed25519 " + base64.StdEncoding.EncodeToString(pubKey) + " OVH_" + keyName

// 	// Convert private key to base64
// 	privateKeyStr := base64.StdEncoding.EncodeToString(privKey)

// 	return publicKeyStr, privateKeyStr, nil
// }

// // Example usage in CreateSSHKey:
// func (h *SSHKeyHandler) CreateSSHKeyWithGeneration(w http.ResponseWriter, r *http.Request) {
// 	var request struct {
// 		KeyName string `json:"keyName"`
// 	}

// 	if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
// 		http.Error(w, "Invalid request body", http.StatusBadRequest)
// 		return
// 	}

// 	publicKey, privateKey, err := GenerateED25519Key(request.KeyName)
// 	if err != nil {
// 		http.Error(w, err.Error(), http.StatusInternalServerError)
// 		return
// 	}

// 	sshKey := SSHKey{
// 		KeyName: request.KeyName,
// 		Key:     publicKey,
// 	}

// 	// print private key to console
// 	fmt.Printf("-----BEGIN OPENSSH PRIVATE KEY-----\n")
// 	fmt.Printf("%s\n", privateKey)
// 	fmt.Printf("-----END OPENSSH PRIVATE KEY-----\n")

// 	// Create SSH key via OVH API
// 	err = config.OVHClient.Post("/me/sshKey", sshKey, &sshKey)
// 	if err != nil {
// 		log.Printf("Error creating SSH key: %v", err)
// 		http.Error(w, "Failed to create SSH key: "+err.Error(), http.StatusInternalServerError)
// 		return
// 	}

// 	// Return created key details
// 	w.Header().Set("Content-Type", "application/json")
// 	w.WriteHeader(http.StatusCreated)
// 	if err := json.NewEncoder(w).Encode(sshKey); err != nil {
// 		log.Printf("Error encoding response: %v", err)
// 		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
// 		return
// 	}
// }

// DeleteSSHKey handles the deletion of an SSH key
func (h *SSHKeyHandler) DeleteSSHKey(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	keyId := vars["id"]
	log.Printf("Handling DELETE request for SSH key: %s from %s", keyId, r.RemoteAddr)

	err := config.OVHClient.Delete("/me/sshKey/"+keyId, nil)
	if err != nil {
		log.Printf("Error deleting SSH key %s: %v", keyId, err)
		http.Error(w, "Failed to delete SSH key: "+err.Error(), http.StatusInternalServerError)
		return
	}

	log.Printf("Successfully deleted SSH key: %s", keyId)
	w.WriteHeader(http.StatusNoContent)
}