package webserver

import (
	"encoding/json"
	"fmt"
	"net/http"

	serveractions "manage-servers/server-actions"

	"github.com/spf13/viper"
)

type WebServer struct {
	servers []serveractions.Server
}

func StartWebServer(servers []serveractions.Server) {
	ws := &WebServer{servers: servers}

	fmt.Println("Starting web server on :8080...")
	http.HandleFunc("/", ws.handleRoot)
	http.HandleFunc("/servers", ws.handleServers)
	http.HandleFunc("/wake", ws.handleWakeServer)
	http.HandleFunc("/shutdown", ws.handleShutdownServer)
	http.HandleFunc("/reboot", ws.handleRebootServer)
	http.HandleFunc("/status", ws.handleStatus)
	http.HandleFunc("/find-mac", ws.handleFindMac)
	http.HandleFunc("/ssh", ws.handleSSH)

	if err := http.ListenAndServe(":8080", nil); err != nil {
		fmt.Printf("Error starting server: %v\n", err)
	}
}

func (ws *WebServer) handleRoot(w http.ResponseWriter, r *http.Request) {
	serveractions.LogDebug("Handling root request: %s %s", r.Method, r.URL.Path)
	http.ServeFile(w, r, "index.html")
}

func (ws *WebServer) handleServers(w http.ResponseWriter, r *http.Request) {
	serveractions.LogDebug("Handling /servers request: %s", r.Method)
	switch r.Method {
	case http.MethodGet:
		ws.getServers(w, r)
	case http.MethodPost:
		ws.addServer(w, r)
	case http.MethodPut:
		ws.updateServer(w, r)
	case http.MethodDelete:
		ws.deleteServer(w, r)
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}

func (ws *WebServer) getServers(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(ws.servers)
}

func (ws *WebServer) updateServer(w http.ResponseWriter, r *http.Request) {
	oldName := r.URL.Query().Get("oldName")
	if oldName == "" {
		http.Error(w, "Missing old server name", http.StatusBadRequest)
		return
	}

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

	found := false
	for i, server := range ws.servers {
		if server.Name == oldName {
			ws.servers[i] = updatedServer
			found = true
			break
		}
	}

	if !found {
		http.Error(w, "Server not found", http.StatusNotFound)
		return
	}

	viper.Set("servers", ws.servers)
	if err := viper.WriteConfig(); err != nil {
		http.Error(w, fmt.Sprintf("Error writing config file: %v", err), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (ws *WebServer) addServer(w http.ResponseWriter, r *http.Request) {
	var newServer serveractions.Server
	if err := json.NewDecoder(r.Body).Decode(&newServer); err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	ws.servers = append(ws.servers, newServer)

	viper.Set("servers", ws.servers)
	if err := viper.WriteConfig(); err != nil {
		// If the file does not exist, create it
		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
			if err = viper.SafeWriteConfig(); err != nil {
				http.Error(w, fmt.Sprintf("Error creating config file: %v", err), http.StatusInternalServerError)
				return
			}
		} else {
			http.Error(w, fmt.Sprintf("Error writing config file: %v", err), http.StatusInternalServerError)
			return
		}
	}

	w.WriteHeader(http.StatusCreated)
}

func (ws *WebServer) deleteServer(w http.ResponseWriter, r *http.Request) {
	serverName := r.URL.Query().Get("name")
	if serverName == "" {
		http.Error(w, "Missing server name", http.StatusBadRequest)
		return
	}

	var found bool
	var updatedServers []serveractions.Server
	for _, server := range ws.servers {
		if server.Name != serverName {
			updatedServers = append(updatedServers, server)
		} else {
			found = true
		}
	}

	if !found {
		http.Error(w, "Server not found", http.StatusNotFound)
		return
	}

	ws.servers = updatedServers
	viper.Set("servers", ws.servers)

	if err := viper.WriteConfig(); err != nil {
		http.Error(w, fmt.Sprintf("Error writing config file: %v", err), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (ws *WebServer) handleWakeServer(w http.ResponseWriter, r *http.Request) {
	serverName := r.URL.Query().Get("name")
	if serverName == "" {
		http.Error(w, "Missing server name", http.StatusBadRequest)
		return
	}
	serveractions.WakeServer(serverName, ws.servers)
	w.WriteHeader(http.StatusOK)
}

func (ws *WebServer) handleShutdownServer(w http.ResponseWriter, r *http.Request) {
	serverName := r.URL.Query().Get("name")
	if serverName == "" {
		http.Error(w, "Missing server name", http.StatusBadRequest)
		return
	}
	serveractions.ShutdownServer(serverName, ws.servers)
	w.WriteHeader(http.StatusOK)
}

func (ws *WebServer) handleRebootServer(w http.ResponseWriter, r *http.Request) {
	serverName := r.URL.Query().Get("name")
	if serverName == "" {
		http.Error(w, "Missing server name", http.StatusBadRequest)
		return
	}
	serveractions.RebootServer(serverName, ws.servers)
	w.WriteHeader(http.StatusOK)
}

func (ws *WebServer) handleStatus(w http.ResponseWriter, r *http.Request) {
	serverName := r.URL.Query().Get("name")
	serveractions.LogDebug("Checking status for server: %s", serverName)
	if serverName == "" {
		http.Error(w, "Missing server name", http.StatusBadRequest)
		return
	}

	for _, s := range ws.servers {
		if s.Name == serverName {
			online := serveractions.PingHost(s.IP)
			status := "Offline"
			if online {
				status = "Online"
			}
			w.Write([]byte(status))
			return
		}
	}

	http.Error(w, "Server not found", http.StatusNotFound)
}

func (ws *WebServer) handleFindMac(w http.ResponseWriter, r *http.Request) {
	ip := r.URL.Query().Get("ip")
	user := r.URL.Query().Get("user")
	pass := r.URL.Query().Get("pass")

	serveractions.LogDebug("Handling /find-mac request for IP: %s (SSH provided: %v)", ip, user != "")
	if ip == "" {
		http.Error(w, "Missing IP address", http.StatusBadRequest)
		return
	}

	// Try ARP first
	mac, err := serveractions.GetMacAddress(ip)
	if err != nil {
		serveractions.LogDebug("ARP lookup failed for %s: %v. Trying SSH fallback...", ip, err)
		// Try SSH fallback if credentials are provided
		if user != "" && pass != "" {
			mac, err = serveractions.GetMacAddressSSH(ip, user, pass)
			if err != nil {
				serveractions.LogDebug("SSH lookup also failed for %s: %v", ip, err)
				http.Error(w, "MAC address not found via ARP or SSH", http.StatusNotFound)
				return
			}
		} else {
			serveractions.LogDebug("No SSH credentials for fallback for %s", ip)
			http.Error(w, "MAC address not found in local network. Please provide SSH credentials for remote lookup.", http.StatusNotFound)
			return
		}
	}

	w.Write([]byte(mac))
}