// Copyright 2024 The Devstar Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package appstore

import (
	"context"

	k8s "code.gitea.io/gitea/modules/k8s"
	applicationv1 "code.gitea.io/gitea/modules/k8s/api/application/v1"
	"code.gitea.io/gitea/modules/k8s/application"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// K8sManager handles Kubernetes-specific application operations
type K8sManager struct {
	ctx context.Context
}

// NewK8sManager creates a new Kubernetes manager
func NewK8sManager(ctx context.Context) *K8sManager {
	return &K8sManager{
		ctx: ctx,
	}
}

// InstallAppToKubernetes installs an application to a Kubernetes cluster
func (km *K8sManager) InstallAppToKubernetes(app *App, kubeconfig []byte, contextName string) error {
	// Validate that the app supports Kubernetes deployment
	if app.Deploy.Type != "kubernetes" && app.DeploymentType != "kubernetes" && app.DeploymentType != "both" {
		return &AppStoreError{
			Code:    "DEPLOYMENT_TYPE_ERROR",
			Message: "Application does not support Kubernetes deployment",
		}
	}

	// Get Kubernetes client
	k8sClient, err := k8s.GetKubernetesClient(km.ctx, kubeconfig, contextName)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_CLIENT_ERROR",
			Message: "Failed to create Kubernetes client",
			Details: err.Error(),
		}
	}

	// Build Kubernetes create options
	createOptions, err := BuildK8sCreateOptions(app)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_OPTIONS_ERROR",
			Message: "Failed to build Kubernetes create options",
			Details: err.Error(),
		}
	}

	// Create the application in Kubernetes
	_, err = application.CreateApplication(km.ctx, k8sClient, createOptions)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_CREATE_ERROR",
			Message: "Failed to create application in Kubernetes",
			Details: err.Error(),
		}
	}

	return nil
}

// UninstallAppFromKubernetes uninstalls an application from a Kubernetes cluster
func (km *K8sManager) UninstallAppFromKubernetes(app *App, kubeconfig []byte, contextName string) error {
	// Validate that the app supports Kubernetes deployment
	if app.Deploy.Type != "kubernetes" && app.DeploymentType != "kubernetes" && app.DeploymentType != "both" {
		return &AppStoreError{
			Code:    "DEPLOYMENT_TYPE_ERROR",
			Message: "Application does not support Kubernetes deployment",
		}
	}

	// Get Kubernetes client
	k8sClient, err := k8s.GetKubernetesClient(km.ctx, kubeconfig, contextName)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_CLIENT_ERROR",
			Message: "Failed to create Kubernetes client",
			Details: err.Error(),
		}
	}

	// Build Kubernetes delete options
	deleteOptions, err := BuildK8sDeleteOptions(app, "")
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_OPTIONS_ERROR",
			Message: "Failed to build Kubernetes delete options",
			Details: err.Error(),
		}
	}

	// Delete the application from Kubernetes
	err = application.DeleteApplication(km.ctx, k8sClient, deleteOptions)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_DELETE_ERROR",
			Message: "Failed to delete application from Kubernetes",
			Details: err.Error(),
		}
	}

	return nil
}

// GetAppFromKubernetes gets an application from a Kubernetes cluster
func (km *K8sManager) GetAppFromKubernetes(app *App, kubeconfig []byte, contextName string) (interface{}, error) {
	// Validate that the app supports Kubernetes deployment
	if app.Deploy.Type != "kubernetes" && app.DeploymentType != "kubernetes" && app.DeploymentType != "both" {
		return nil, &AppStoreError{
			Code:    "DEPLOYMENT_TYPE_ERROR",
			Message: "Application does not support Kubernetes deployment",
		}
	}

	// Get Kubernetes client
	k8sClient, err := k8s.GetKubernetesClient(km.ctx, kubeconfig, contextName)
	if err != nil {
		return nil, &AppStoreError{
			Code:    "KUBERNETES_CLIENT_ERROR",
			Message: "Failed to create Kubernetes client",
			Details: err.Error(),
		}
	}

	// Build Kubernetes get options
	getOptions, err := BuildK8sGetOptions(app, "", false)
	if err != nil {
		return nil, &AppStoreError{
			Code:    "KUBERNETES_OPTIONS_ERROR",
			Message: "Failed to build Kubernetes get options",
			Details: err.Error(),
		}
	}

	// Get the application from Kubernetes
	return application.GetApplication(km.ctx, k8sClient, getOptions)
}

// ListAppsFromKubernetes lists applications from a Kubernetes cluster
func (km *K8sManager) ListAppsFromKubernetes(app *App, kubeconfig []byte, contextName string) (*applicationv1.ApplicationList, error) {
	// Validate that the app supports Kubernetes deployment
	if app.Deploy.Type != "kubernetes" && app.DeploymentType != "kubernetes" && app.DeploymentType != "both" {
		return nil, &AppStoreError{
			Code:    "DEPLOYMENT_TYPE_ERROR",
			Message: "Application does not support Kubernetes deployment",
		}
	}

	// Get Kubernetes client
	k8sClient, err := k8s.GetKubernetesClient(km.ctx, kubeconfig, contextName)
	if err != nil {
		return nil, &AppStoreError{
			Code:    "KUBERNETES_CLIENT_ERROR",
			Message: "Failed to create Kubernetes client",
			Details: err.Error(),
		}
	}

	// Build Kubernetes list options
	listOptions, err := BuildK8sListOptions("", metav1.ListOptions{})
	if err != nil {
		return nil, &AppStoreError{
			Code:    "KUBERNETES_OPTIONS_ERROR",
			Message: "Failed to build Kubernetes list options",
			Details: err.Error(),
		}
	}

	// List applications from Kubernetes
	return application.ListApplications(km.ctx, k8sClient, listOptions)
}

// UpdateAppInKubernetes updates an application in a Kubernetes cluster
func (km *K8sManager) UpdateAppInKubernetes(app *App, kubeconfig []byte, contextName string) error {
	// Validate that the app supports Kubernetes deployment
	if app.Deploy.Type != "kubernetes" && app.DeploymentType != "kubernetes" && app.DeploymentType != "both" {
		return &AppStoreError{
			Code:    "DEPLOYMENT_TYPE_ERROR",
			Message: "Application does not support Kubernetes deployment",
		}
	}

	// Get Kubernetes client
	k8sClient, err := k8s.GetKubernetesClient(km.ctx, kubeconfig, contextName)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_CLIENT_ERROR",
			Message: "Failed to create Kubernetes client",
			Details: err.Error(),
		}
	}

	// Build Kubernetes update options
	updateOptions, err := BuildK8sUpdateOptions(app, "", nil)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_OPTIONS_ERROR",
			Message: "Failed to build Kubernetes update options",
			Details: err.Error(),
		}
	}

	// Update the application in Kubernetes
	_, err = application.UpdateApplication(km.ctx, k8sClient, updateOptions)
	if err != nil {
		return &AppStoreError{
			Code:    "KUBERNETES_UPDATE_ERROR",
			Message: "Failed to update application in Kubernetes",
			Details: err.Error(),
		}
	}

	return nil
}