package controller

import (
	"context"
	"fmt"
	"slices"
	"strings"

	gomaprojv1beta1 "github.com/jkaninda/goma-operator/api/v1beta1"
	"gopkg.in/yaml.v3"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
	"sigs.k8s.io/controller-runtime/pkg/log"
)

func gatewayConfig(r GatewayReconciler, ctx context.Context, req ctrl.Request, gateway *gomaprojv1beta1.Gateway) GatewayConfig {
	logger := log.FromContext(ctx)
	gomaConfig := &GatewayConfig{}
	gomaConfig.Version = GatewayConfigVersion
	gomaConfig.Gateway = mapToGateway(gateway.Spec)
	labelSelector := client.MatchingLabels{}
	var middlewareNames []string
	// List ConfigMaps in the namespace with the matching label
	var routes gomaprojv1beta1.RouteList
	if err := r.List(ctx, &routes, labelSelector, client.InNamespace(req.Namespace)); err != nil {
		logger.Error(err, "Failed to list Routes")
		return *gomaConfig
	}
	var middlewares gomaprojv1beta1.MiddlewareList
	if err := r.List(ctx, &middlewares, labelSelector, client.InNamespace(req.Namespace)); err != nil {
		logger.Error(err, "Failed to list Middlewares")
		return *gomaConfig
	}
	logger.Info(fmt.Sprintf("Listing Routes: size: %d", len(routes.Items)))

	for _, route := range routes.Items {
		logger.Info("Found Route", "Name", route.Name)
		if route.Spec.Gateway == gateway.Name {
			gomaConfig.Gateway.Routes = append(gomaConfig.Gateway.Routes, route.Spec.Routes...)
			for _, rt := range route.Spec.Routes {
				middlewareNames = append(middlewareNames, rt.Middlewares...)

			}

		}
	}
	for _, mid := range middlewares.Items {
		middleware := *mapMid(mid)
		logger.Info("Adding Middleware", "Name", middleware.Name)
		if slices.Contains(middlewareNames, middleware.Name) {
			gomaConfig.Middlewares = append(gomaConfig.Middlewares, middleware)
		}

	}
	return *gomaConfig
}
func updateGatewayConfig(r RouteReconciler, ctx context.Context, req ctrl.Request, gateway gomaprojv1beta1.Gateway) error {
	logger := log.FromContext(ctx)
	gomaConfig := &GatewayConfig{}
	gomaConfig.Version = GatewayConfigVersion
	gomaConfig.Gateway = mapToGateway(gateway.Spec)
	labelSelector := client.MatchingLabels{}
	var middlewareNames []string
	// List ConfigMaps in the namespace with the matching label
	var routes gomaprojv1beta1.RouteList
	if err := r.List(ctx, &routes, labelSelector, client.InNamespace(req.Namespace)); err != nil {
		logger.Error(err, "Failed to list Routes")
		return err
	}
	var middlewares gomaprojv1beta1.MiddlewareList
	if err := r.List(ctx, &middlewares, labelSelector, client.InNamespace(req.Namespace)); err != nil {
		logger.Error(err, "Failed to list Middlewares")
		return err
	}
	logger.Info(fmt.Sprintf("Listing Routes: size: %d", len(routes.Items)))

	for _, route := range routes.Items {
		logger.Info("Found Route", "Name", route.Name)
		if route.Spec.Gateway == gateway.Name {
			gomaConfig.Gateway.Routes = append(gomaConfig.Gateway.Routes, route.Spec.Routes...)
			for _, rt := range route.Spec.Routes {
				middlewareNames = append(middlewareNames, rt.Middlewares...)

			}

		}
	}
	for _, mid := range middlewares.Items {
		middleware := *mapMid(mid)
		logger.Info("Adding Middleware", "Name", middleware.Name)
		if slices.Contains(middlewareNames, middleware.Name) {
			gomaConfig.Middlewares = append(gomaConfig.Middlewares, middleware)
		}

	}

	yamlContent, err := yaml.Marshal(&gomaConfig)
	if err != nil {
		logger.Error(err, "Unable to marshal YAML")
		return err
	}
	// Define the desired ConfigMap
	configMap := &corev1.ConfigMap{
		ObjectMeta: metav1.ObjectMeta{
			Name:      gateway.Name,
			Namespace: req.Namespace,
			Labels: map[string]string{
				"belongs-to": BelongsTo,
				"gateway":    gateway.Name,
			},
		},
		Data: map[string]string{
			ConfigName: strings.TrimSpace(string(yamlContent)),
		},
	}
	// Check if the ConfigMap already exists
	var existingConfigMap corev1.ConfigMap
	err = r.Get(ctx, types.NamespacedName{Name: configMap.Name, Namespace: configMap.Namespace}, &existingConfigMap)
	if err != nil && client.IgnoreNotFound(err) != nil {
		logger.Error(err, "Failed to get ConfigMap")
		return err
	}

	if err != nil && client.IgnoreNotFound(err) == nil {
		// Create the ConfigMap if it doesn't exist
		if err = controllerutil.SetControllerReference(&gateway, configMap, r.Scheme); err != nil {
			logger.Error(err, "Failed to set controller reference")
			return err
		}
		if err = r.Create(ctx, configMap); err != nil {
			logger.Error(err, "Failed to create ConfigMap")
			return err
		}
		logger.Info("Created ConfigMap", "ConfigMap.Name", configMap.Name)
	} else {
		// Optional: Update the ConfigMap if needed
		if !equalConfigMapData(existingConfigMap.Data, configMap.Data) {
			existingConfigMap.Data = configMap.Data
			if err = r.Update(ctx, &existingConfigMap); err != nil {
				logger.Error(err, "Failed to update ConfigMap")
				return err
			}
			logger.Info("Updated ConfigMap", "ConfigMap.Name", configMap.Name)
		}

	}
	return nil

}

// Helper function to compare ConfigMap data
func equalConfigMapData(existing, desired map[string]string) bool {
	if len(existing) != len(desired) {
		return false
	}
	for key, value := range desired {
		if existing[key] != value {
			return false
		}
	}
	return true
}

// mapMid converts RawExtensionT to struct
func mapMid(middleware gomaprojv1beta1.Middleware) *Middleware {
	mid := &Middleware{
		Name:  middleware.Name,
		Type:  middleware.Spec.Type,
		Paths: middleware.Spec.Paths,
	}
	switch middleware.Spec.Type {
	case BasicAuth:
		var basicAuth BasicRuleMiddleware
		err := ConvertRawExtensionToStruct(middleware.Spec.Rule, &basicAuth)
		if err != nil {
			return mid
		}
		mid.Rule = basicAuth
		return mid
	case OAuth:
		var oauthRulerMiddleware OauthRulerMiddleware
		err := ConvertRawExtensionToStruct(middleware.Spec.Rule, &oauthRulerMiddleware)
		if err != nil {
			return mid
		}
		mid.Rule = oauthRulerMiddleware
		return mid
	case JWTAuth:
		var jwtAuth JWTRuleMiddleware
		err := ConvertRawExtensionToStruct(middleware.Spec.Rule, &jwtAuth)
		if err != nil {
			return mid
		}
		mid.Rule = jwtAuth
		return mid
	case ratelimit, RateLimit:
		var rateLimitRuleMiddleware RateLimitRuleMiddleware
		err := ConvertRawExtensionToStruct(middleware.Spec.Rule, &rateLimitRuleMiddleware)
		if err != nil {
			return mid
		}
		mid.Rule = rateLimitRuleMiddleware
		return mid
	}
	return mid
}