package configapi

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

	"github.com/azukaar/cosmos-server/src/utils"
)

type UpdateRouteRequest struct {
	RouteName string `json:"routeName"`
	Operation string `json:"operation"`
	NewRoute  *utils.ProxyRouteConfig `json:"newRoute,omitempty"`
}

var configLock sync.Mutex

func ConfigApiPatch(w http.ResponseWriter, req *http.Request) {
	if utils.AdminOnly(w, req) != nil {
		return
	}

	configLock.Lock()
	defer configLock.Unlock()

	var updateReq UpdateRouteRequest
	err := json.NewDecoder(req.Body).Decode(&updateReq)
	if err != nil {
		utils.Error("SettingsUpdate: Invalid Update Request", err)
		utils.HTTPError(w, "Invalid Update Request", http.StatusBadRequest, "UR001")
		return
	}

	config := utils.ReadConfigFromFile()
	routes := config.HTTPConfig.ProxyConfig.Routes
	routeIndex := -1

	for i, route := range routes {
		if route.Name == updateReq.RouteName {
			routeIndex = i
			break
		}
	}

	if routeIndex == -1 {
		utils.Error("SettingsUpdate: Route not found: "+updateReq.RouteName, nil)
		utils.HTTPError(w, "Route not found", http.StatusNotFound, "UR002")
		return
	}

	switch updateReq.Operation {
	case "replace":
		if updateReq.NewRoute == nil {
			utils.Error("SettingsUpdate: NewRoute must be provided for replace operation", nil)
			utils.HTTPError(w, "NewRoute must be provided for replace operation", http.StatusBadRequest, "UR003")
			return
		}
		routes[routeIndex] = *updateReq.NewRoute
	case "move_up":
		if routeIndex > 0 {
			routes[routeIndex-1], routes[routeIndex] = routes[routeIndex], routes[routeIndex-1]
		}
	case "move_down":
		if routeIndex < len(routes)-1 {
			routes[routeIndex+1], routes[routeIndex] = routes[routeIndex], routes[routeIndex+1]
		}
	case "delete":
		routes = append(routes[:routeIndex], routes[routeIndex+1:]...)
	default:
		utils.Error("SettingsUpdate: Unsupported operation: "+updateReq.Operation, nil)
		utils.HTTPError(w, "Unsupported operation", http.StatusBadRequest, "UR004")
		return
	}

	config.HTTPConfig.ProxyConfig.Routes = routes
	utils.SaveConfigTofile(config)
	utils.NeedsRestart = true

	json.NewEncoder(w).Encode(map[string]interface{}{
		"status": "OK",
	})
}