/*
Copyright 2023 The K8sGPT Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package serve

import (
	"os"

	"github.com/fatih/color"
	"github.com/k8sgpt-ai/k8sgpt/pkg/ai"
	k8sgptserver "github.com/k8sgpt-ai/k8sgpt/pkg/server"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"go.uber.org/zap"
)

var (
	port        string
	metricsPort string
	backend     string
)

var ServeCmd = &cobra.Command{
	Use:   "serve",
	Short: "Runs k8sgpt as a server",
	Long:  `Runs k8sgpt as a server to allow for easy integration with other applications.`,
	Run: func(cmd *cobra.Command, args []string) {

		var configAI ai.AIConfiguration
		err := viper.UnmarshalKey("ai", &configAI)
		if err != nil {
			color.Red("Error: %v", err)
			os.Exit(1)
		}
		var aiProvider *ai.AIProvider
		if len(configAI.Providers) == 0 {
			// Check for env injection
			backend = os.Getenv("K8SGPT_BACKEND")
			password := os.Getenv("K8SGPT_PASSWORD")
			model := os.Getenv("K8SGPT_MODEL")
			baseURL := os.Getenv("K8SGPT_BASEURL")
			engine := os.Getenv("K8SGPT_ENGINE")
			// If the envs are set, allocate in place to the aiProvider
			// else exit with error
			envIsSet := backend != "" || password != "" || model != ""
			if envIsSet {
				aiProvider = &ai.AIProvider{
					Name:     backend,
					Password: password,
					Model:    model,
					BaseURL:  baseURL,
					Engine:   engine,
				}

				configAI.Providers = append(configAI.Providers, *aiProvider)

				viper.Set("ai", configAI)
				if err := viper.WriteConfig(); err != nil {
					color.Red("Error writing config file: %s", err.Error())
					os.Exit(1)
				}
			} else {
				color.Red("Error: AI provider not specified in configuration. Please run k8sgpt auth")
				os.Exit(1)
			}
		}
		if aiProvider == nil {
			for _, provider := range configAI.Providers {
				if backend == provider.Name {
					// the pointer to the range variable is not really an issue here, as there
					// is a break right after, but to prevent potential future issues, a temp
					// variable is assigned
					p := provider
					aiProvider = &p
					break
				}
			}
		}

		if aiProvider.Name == "" {
			color.Red("Error: AI provider %s not specified in configuration. Please run k8sgpt auth", backend)
			os.Exit(1)
		}

		logger, err := zap.NewProduction()
		if err != nil {
			color.Red("failed to create logger: %v", err)
			os.Exit(1)
		}
		defer logger.Sync()

		server := k8sgptserver.Config{
			Backend:     aiProvider.Name,
			Port:        port,
			MetricsPort: metricsPort,
			Token:       aiProvider.Password,
			Logger:      logger,
		}
		go func() {
			if err := server.ServeMetrics(); err != nil {
				color.Red("Error: %v", err)
				os.Exit(1)
			}
		}()

		go func() {
			if err := server.Serve(); err != nil {
				color.Red("Error: %v", err)
				os.Exit(1)
			}
		}()

		// Wait for both servers to exit
		select {}
	},
}

func init() {
	// add flag for backend
	ServeCmd.Flags().StringVarP(&port, "port", "p", "8080", "Port to run the server on")
	ServeCmd.Flags().StringVarP(&metricsPort, "metrics-port", "", "8081", "Port to run the metrics-server on")
	ServeCmd.Flags().StringVarP(&backend, "backend", "b", "openai", "Backend AI provider")
}