package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"super-frpc/postLog"
	"time"
)

var frpcDB *sql.DB

func CloseFrpcDatabase() error {
	if frpcDB != nil {
		return frpcDB.Close()
	}
	return nil
}

func CreateInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[CreateInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	bootAtStart := false
	if bas, ok := reqMap["bootAtStart"]; ok {
		switch v := bas.(type) {
		case bool:
			bootAtStart = v
		case string:
			if v == "true" {
				bootAtStart = true
			}
		}
	}

	instanceInfoMap, ok := reqMap["instanceInfo"].(map[string]interface{})
	if !ok {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceInfo format")
		return
	}

	instanceInfo := InstanceInfo{
		Name:       getStringFromMap(instanceInfoMap, "name"),
		ServerAddr: getStringFromMap(instanceInfoMap, "serverAddr"),
		ServerPort: getStringFromMap(instanceInfoMap, "serverPort"),
		AuthMethod: getStringFromMap(instanceInfoMap, "auth_method"),
		RunUser:    getStringFromMap(reqMap, "runUser"),
	}

	if additional, ok := reqMap["additionalProperties"].(map[string]interface{}); ok {
		instanceInfo.Additional = additional
	}

	req := CreateInstanceRequest{
		InstanceInfo: instanceInfo,
		BootAtStart:  bootAtStart,
		RunUser:      instanceInfo.RunUser,
		Additional:   instanceInfo.Additional,
	}

	if req.InstanceInfo.Name == "" || req.InstanceInfo.ServerAddr == "" ||
		req.InstanceInfo.ServerPort == "" || req.InstanceInfo.AuthMethod == "" {
		SendErrorResponse(w, http.StatusBadRequest, "Missing required fields in instanceInfo")
		return
	}

	runUser := req.RunUser
	if runUser == "" {
		runUser = "root"
	}

	user, err := GetUserByID(userID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to get user info: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get user info")
		return
	}

	configDir, err := GetConfigDir()
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to get config directory: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get config directory")
		return
	}

	configFileName := fmt.Sprintf("superfrpc_%s_%s.toml", user.Username, req.InstanceInfo.Name)
	configPath := filepath.Join(configDir, configFileName)

	configContent := generateFrpcConfig(req.InstanceInfo)
	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to create config file %s: %v", configPath, err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to create config file")
		return
	}

	instance := FrpcInstance{
		UserID:      userID,
		Name:        req.InstanceInfo.Name,
		BootAtStart: req.BootAtStart,
		RunUser:     runUser,
		ConfigPath:  configPath,
	}

	if err := DBAddFrpcInstance(instance); err != nil {
		os.Remove(configPath)
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to save instance %s to database: %v", req.InstanceInfo.Name, err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to save instance to database")
		return
	}

	createdInstance, err := DBQueryFrpcInstance(userID, req.InstanceInfo.Name)
	if err != nil {
		os.Remove(configPath)
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to query created instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query created instance")
		return
	}

	if err := createBootService(createdInstance.ID); err != nil {
		frpcDB.Exec("DELETE FROM frpcInstances WHERE userID = ? AND name = ?", userID, req.InstanceInfo.Name)
		os.Remove(configPath)
		postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to create boot service for instance %s: %v", req.InstanceInfo.Name, err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to create boot service")
		return
	}

	if req.BootAtStart {
		if err := setBootAtStart(createdInstance.ID); err != nil {
			postLog.Error(fmt.Sprintf("[CreateInstanceHandler] Failed to set boot at start for instance %s: %v", req.InstanceInfo.Name, err))
			SendErrorResponse(w, http.StatusInternalServerError, "Failed to set boot at start")
			return
		}
	}

	SendSuccessResponse(w, "Instance created successfully", map[string]interface{}{
		"name":        req.InstanceInfo.Name,
		"configPath":  configPath,
		"bootAtStart": req.BootAtStart,
	})
	postLog.Info(fmt.Sprintf("[CreateInstanceHandler] Instance %s created successfully: configPath=%s, bootAtStart=%v, runUser=%s, additionalProperties=%v", req.InstanceInfo.Name, configPath, req.BootAtStart, runUser, req.Additional))
}

func DeleteInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[DeleteInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceIDStr := getStringFromMap(reqMap, "instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] User %d tried to delete a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if err := removeBootService(instanceID); err != nil {
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to remove boot service for instance %s: %v", instance.Name, err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to remove boot service")
		return
	}

	if _, err := os.Stat(instance.ConfigPath); err == nil {
		if err := os.Remove(instance.ConfigPath); err != nil {
			postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to remove config file %s: %v", instance.ConfigPath, err))
			SendErrorResponse(w, http.StatusInternalServerError, "Failed to remove config file")
			return
		}
	}

	if err := DBRemoveFrpcInstanceByID(instanceID); err != nil {
		postLog.Error(fmt.Sprintf("[DeleteInstanceHandler] Failed to delete instance %d from database: %v", instanceID, err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to delete instance from database")
		return
	}

	SendSuccessResponse(w, "Instance deleted successfully", map[string]interface{}{
		"id": instanceID,
	})
	postLog.Info(fmt.Sprintf("[DeleteInstanceHandler] Instance %d deleted successfully", instanceID))
}

func ModifyInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[ModifyInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceIDStr := getStringFromMap(reqMap, "instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	modifyType := getStringFromMap(reqMap, "type")
	if modifyType == "" {
		SendErrorResponse(w, http.StatusBadRequest, "type is required")
		return
	}

	if modifyType != "configFile" && modifyType != "systemConfig" {
		SendErrorResponse(w, http.StatusBadRequest, fmt.Sprintf("Unknown modify type %s", modifyType))
		return
	}

	modifiedData, ok := reqMap["modifiedData"].(map[string]interface{})
	if !ok || modifiedData == nil {
		SendErrorResponse(w, http.StatusBadRequest, "modifiedData is required and must be an object")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] User %d tried to modify a not existed instance: %d", userID, instanceID))
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] User %d does not have permission to modify instance %d", userID, instanceID))
		SendErrorResponse(w, http.StatusForbidden, "Permission denied")
		return
	}

	user, err := GetUserByID(instance.UserID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyInstanceHandler] Failed to get user info: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get user info")
		return
	}

	if modifyType == "configFile" {
		handleConfigFileModify(w, instance, modifiedData, user.Username)
	} else {
		handleSystemConfigModify(w, r, instance, modifiedData, user)
	}
}

func handleConfigFileModify(w http.ResponseWriter, instance FrpcInstance, modifiedData map[string]interface{}, username string) {
	configPath := instance.ConfigPath

	for key, value := range modifiedData {
		configKey := key
		if key == "auth_method" {
			configKey = "auth.method"
		}
		if key == "auth_token" {
			configKey = "auth.token"
		}

		var configValue string
		if key == "serverPort" {
			switch v := value.(type) {
			case float64:
				configValue = strconv.Itoa(int(v))
			case int:
				configValue = strconv.Itoa(v)
			case string:
				var intVal int
				if _, err := fmt.Sscanf(v, "%d", &intVal); err == nil {
					configValue = strconv.Itoa(intVal)
				} else {
					configValue = v
				}
			default:
				configValue = fmt.Sprintf("%v", value)
			}
		} else {
			configValue = fmt.Sprintf("%v", value)
		}
		if err := setKeyText(configPath, configKey, "", configValue); err != nil {
			postLog.Error(fmt.Sprintf("[handleConfigFileModify] Failed to set key %s: %v", key, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to set key %s", key))
			return
		}
	}

	SendSuccessResponse(w, "Config file modified successfully", map[string]interface{}{
		"instanceName": instance.Name,
		"instanceID":   instance.ID,
		"configPath":   configPath,
	})
	postLog.Info(fmt.Sprintf("[handleConfigFileModify] Config file for instance %s modified successfully", instance.Name))
}

func handleSystemConfigModify(w http.ResponseWriter, r *http.Request, instance FrpcInstance, modifiedData map[string]interface{}, user *User) {
	newName := instance.Name
	newRunUser := instance.RunUser
	newBootAtStart := instance.BootAtStart
	var bootServiceError string

	if v, ok := modifiedData["name"].(string); ok && v != "" {
		newName = v
	}
	if v, ok := modifiedData["runUser"].(string); ok {
		newRunUser = v
	}
	if v, ok := modifiedData["bootAtStart"].(bool); ok {
		newBootAtStart = v
	}

	oldConfigPath := instance.ConfigPath
	var newConfigPath string

	if newName != instance.Name || newRunUser != instance.RunUser {
		configDir, err := GetConfigDir()
		if err != nil {
			postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to get config directory: %v", err))
			SendErrorResponse(w, http.StatusInternalServerError, "Failed to get config directory")
			return
		}

		newConfigFileName := fmt.Sprintf("superfrpc_%s_%s.toml", user.Username, newName)
		newConfigPath = filepath.Join(configDir, newConfigFileName)

		if oldConfigPath != newConfigPath {
			if _, err := os.Stat(oldConfigPath); err == nil {
				if err := os.Rename(oldConfigPath, newConfigPath); err != nil {
					postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to rename config file %s to %s: %v", oldConfigPath, newConfigPath, err))
					SendErrorResponse(w, http.StatusInternalServerError, "Failed to rename config file")
					return
				}
			}
		}
	} else {
		newConfigPath = oldConfigPath
	}

	instance.RunUser = newRunUser
	instance.BootAtStart = newBootAtStart
	instance.ConfigPath = newConfigPath
	// Update instance new name will be processed in boot service creation or removal

	if err := DBUpdateFrpcInstance(instance); err != nil {
		postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to update instance in database: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to update instance in database")
		return
	}

	if newBootAtStart {
		if err := removeBootAtStart(instance.ID); err != nil {
			postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to remove boot at start: %v", err))
			bootServiceError = fmt.Sprintf("Failed to remove boot at start: %v", err)
		}
		instance.Name = newName
		if err := setBootAtStart(instance.ID); err != nil {
			postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to set boot at start: %v", err))
			if bootServiceError != "" {
				bootServiceError += "; "
			}
			bootServiceError += fmt.Sprintf("Failed to set boot at start: %v", err)
		}
	} else {
		if err := removeBootAtStart(instance.ID); err != nil {
			postLog.Error(fmt.Sprintf("[handleSystemConfigModify] Failed to remove boot at start: %v", err))
			bootServiceError = fmt.Sprintf("Failed to remove boot at start: %v", err)
		}
		instance.Name = newName
	}
	instance.Name = newName

	data := map[string]interface{}{
		"instanceName": newName,
		"instanceID":   instance.ID,
		"configPath":   newConfigPath,
		"bootAtStart":  newBootAtStart,
		"runUser":      newRunUser,
	}
	if bootServiceError != "" {
		data["bootServiceError"] = bootServiceError
	}
	SendSuccessResponse(w, "System config modified successfully", data)
}

func GetUserInstances(userID int) ([]FrpcInstance, error) {
	rows, err := frpcDB.Query(`
		SELECT id, userID, name, bootAtStart, runUser, configPath, createdAt
		FROM frpcInstances WHERE userID = ?
	`, userID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var instances []FrpcInstance
	for rows.Next() {
		var instance FrpcInstance
		var createdAtStr string
		if err := rows.Scan(
			&instance.ID, &instance.UserID, &instance.Name, &instance.BootAtStart, &instance.RunUser, &instance.ConfigPath, &createdAtStr,
		); err != nil {
			return nil, err
		}
		instance.CreatedAt, _ = time.Parse(time.RFC3339, createdAtStr)
		instances = append(instances, instance)
	}

	return instances, nil
}

func getStringFromMap(m map[string]interface{}, key string) string {
	if v, ok := m[key].(string); ok {
		return v
	}
	return ""
}

func ListInstancesHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodGet)
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[ListInstancesHandler] Auth failed: %v", err))
		return
	}

	instances, err := GetUserInstances(userID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ListInstancesHandler] Failed to get user instances: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get instances")
		return
	}

	instanceList := make([]map[string]interface{}, len(instances))
	for i, inst := range instances {
		instanceData := map[string]interface{}{
			"instanceID": inst.ID,
			"name":       inst.Name,
			"createdAt":  inst.CreatedAt,
			"createdBy":  inst.CreatedBy,
			"isRunning":  IsInstanceRunning(inst.ID),
		}

		instanceList[i] = instanceData
	}

	SendSuccessResponse(w, "Instances retrieved successfully", instanceList)
	postLog.Info(fmt.Sprintf("[ListInstancesHandler] Retrieved %d instances for user %d", len(instances), userID))
}

func StartInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[StartInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceIDStr := getStringFromMap(reqMap, "instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] User %d tried to start a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		SendErrorResponse(w, http.StatusForbidden, "Instance not found")
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] User %d tried to start instance %d that does not belong to them", userID, instanceID))
		return
	}

	initType := GetInitSystem()
	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to get service name: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get service name")
		return
	}

	switch initType {
	case "windows":
		if err := StartWindowsService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to start Windows service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to start Windows service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StartInstanceHandler] Windows service %s started successfully", serviceName))
		SendSuccessResponse(w, "Instance started successfully", nil)

	case "systemd":
		if err := StartSystemdService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to start systemd service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to start systemd service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StartInstanceHandler] Systemd service %s started successfully", serviceName))
		SendSuccessResponse(w, "Instance started successfully", nil)

	case "init.d":
		if err := StartInitDService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StartInstanceHandler] Failed to start init.d service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to start init.d service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StartInstanceHandler] Init.d service %s started successfully", serviceName))
		SendSuccessResponse(w, "Instance started successfully", nil)

	default:
		postLog.Error(fmt.Sprintf("[StartInstanceHandler] Unsupported init system: %s", initType))
		SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Unsupported init system: %s", initType))
		return
	}
}

func StopInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[StopInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceIDStr := getStringFromMap(reqMap, "instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] User %d tried to stop a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		SendErrorResponse(w, http.StatusForbidden, "Instance not found")
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] User %d tried to stop instance %d that does not belong to them", userID, instanceID))
		return
	}

	initType := GetInitSystem()
	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to get service name: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get service name")
		return
	}

	switch initType {
	case "windows":
		if err := StopWindowsService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to stop Windows service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to stop Windows service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StopInstanceHandler] Windows service %s stopped successfully", serviceName))
		SendSuccessResponse(w, "Instance stopped successfully", nil)

	case "systemd":
		if err := StopSystemdService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to stop systemd service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to stop systemd service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StopInstanceHandler] Systemd service %s stopped successfully", serviceName))
		SendSuccessResponse(w, "Instance stopped successfully", nil)

	case "init.d":
		if err := StopInitDService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[StopInstanceHandler] Failed to stop init.d service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to stop init.d service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[StopInstanceHandler] Init.d service %s stopped successfully", serviceName))
		SendSuccessResponse(w, "Instance stopped successfully", nil)

	default:
		postLog.Error(fmt.Sprintf("[StopInstanceHandler] Unsupported init system: %s", initType))
		SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Unsupported init system: %s", initType))
		return
	}
}

func RestartInstanceHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[RestartInstanceHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to read request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to unmarshal request body: %v", err))
		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceIDStr := getStringFromMap(reqMap, "instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] User %d tried to restart a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		SendErrorResponse(w, http.StatusForbidden, "Instance not found")
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] User %d tried to restart instance %d that does not belong to them", userID, instanceID))
		return
	}

	initType := GetInitSystem()
	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to get service name: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get service name")
		return
	}

	switch initType {
	case "windows":
		if err := RestartWindowsService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to restart Windows service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to restart Windows service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[RestartInstanceHandler] Windows service %s restarted successfully", serviceName))
		SendSuccessResponse(w, "Instance restarted successfully", nil)

	case "systemd":
		if err := RestartSystemdService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to restart systemd service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to restart systemd service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[RestartInstanceHandler] Systemd service %s restarted successfully", serviceName))
		SendSuccessResponse(w, "Instance restarted successfully", nil)

	case "init.d":
		if err := RestartInitDService(serviceName); err != nil {
			postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Failed to restart init.d service %s: %v", serviceName, err))
			SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Failed to restart init.d service: %v", err))
			return
		}
		postLog.Info(fmt.Sprintf("[RestartInstanceHandler] Init.d service %s restarted successfully", serviceName))
		SendSuccessResponse(w, "Instance restarted successfully", nil)

	default:
		postLog.Error(fmt.Sprintf("[RestartInstanceHandler] Unsupported init system: %s", initType))
		SendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("Unsupported init system: %s", initType))
		return
	}
}

func GetInstanceStatusHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodGet)
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[GetInstanceStatusHandler] Auth failed: %v", err))
		return
	}

	queryParams := r.URL.Query()
	instanceIDStr := queryParams.Get("instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[GetInstanceStatusHandler] User %d tried to get status of a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[GetInstanceStatusHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		SendErrorResponse(w, http.StatusForbidden, "Instance not found")
		postLog.Error(fmt.Sprintf("[GetInstanceStatusHandler] User %d tried to get status of instance %d that does not belong to them", userID, instanceID))
		return
	}

	initType := GetInitSystem()

	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[GetInstanceStatusHandler] Failed to get service name: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get service name")
		return
	}

	responseData := map[string]interface{}{
		"name":        instance.Name,
		"initSystem":  initType,
		"serviceName": serviceName,
		"isRunning":   false,
	}

	isRunning := IsInstanceRunning(instanceID)
	responseData["isRunning"] = isRunning

	SendSuccessResponse(w, "Instance status retrieved successfully", responseData)
	postLog.Info(fmt.Sprintf("[GetInstanceStatusHandler] Retrieved status for instance %d (name: %s), isRunning: %v", instanceID, instance.Name, isRunning))
}

func GetInstanceInfoHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := Auth(w, r, http.MethodGet)
	if err != nil {
		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[GetInstanceInfoHandler] Auth failed: %v", err))
		return
	}

	queryParams := r.URL.Query()
	instanceIDStr := queryParams.Get("instanceID")
	if instanceIDStr == "" {
		SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	instanceID, err := strconv.Atoi(instanceIDStr)
	if err != nil {
		SendErrorResponse(w, http.StatusBadRequest, "Invalid instanceID format")
		return
	}

	instance, err := DBQueryFrpcInstanceByID(instanceID)
	if err == sql.ErrNoRows {
		SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] User %d tried to get info of a not existed instance: %d", userID, instanceID))
		return
	}
	if err != nil {
		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] Failed to query instance: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		SendErrorResponse(w, http.StatusForbidden, "Instance not found")
		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] User %d tried to get info of instance %d that does not belong to them", userID, instanceID))
		return
	}

	userType, err := GetUserType(userID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] Failed to get user type: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get user type")
		return
	}

	serviceName, err := GetServiceNameByInstanceID(instanceID)
	if err != nil {
		postLog.Error(fmt.Sprintf("[GetInstanceInfoHandler] Failed to get service name: %v", err))
		SendErrorResponse(w, http.StatusInternalServerError, "Failed to get service name")
		return
	}

	isRunning := IsInstanceRunning(instanceID)

	responseData := map[string]interface{}{
		"name":        instance.Name,
		"serviceName": serviceName,
		"createdAt":   instance.CreatedAt,
		"createdBy":   instance.CreatedBy,
		"isRunning":   isRunning,
		"auth_method": "",
		"bootAtStart": instance.BootAtStart,
		"runUser":     instance.RunUser,
		"configPath":  instance.ConfigPath,
	}

	configContent, err := os.ReadFile(instance.ConfigPath)
	if err == nil {
		config, err := decodeFrpcConfig(string(configContent))
		if err == nil {
			if authMethod, ok := config.Global["auth.method"]; ok {
				responseData["auth_method"] = authMethod
			}

			if userType == "admin" || userType == "superuser" {
				if serverAddr, ok := config.Global["serverAddr"]; ok {
					responseData["serverAddr"] = serverAddr
				}
				if serverPort, ok := config.Global["serverPort"]; ok {
					responseData["serverPort"] = serverPort
				}
			}
		}
	}

	SendSuccessResponse(w, "Instance info retrieved successfully", responseData)
	postLog.Info(fmt.Sprintf("[GetInstanceInfoHandler] Retrieved info for instance %d (name: %s), userType: %s", instanceID, instance.Name, userType))
}