feat: added the ability to set a user default AI provider (#427)

* feat: added the ability to set a user default AI provider

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* feat: added the ability to set a user default AI provider

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: added provider to json output

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

---------

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

cmd/auth/default.go

@@ -0,0 +1,79 @@
+/*
+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 auth
+
+import (
+	"os"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var (
+	providerName string
+)
+
+var defaultCmd = &cobra.Command{
+	Use:   "default",
+	Short: "Set your default AI backend provider",
+	Long:  "The command to set your new default AI backend provider (default is openai)",
+	Run: func(cmd *cobra.Command, args []string) {
+		err := viper.UnmarshalKey("ai", &configAI)
+		if err != nil {
+			color.Red("Error: %v", err)
+			os.Exit(1)
+		}
+		if providerName == "" {
+			if configAI.DefaultProvider != "" {
+				color.Yellow("Your default provider is %s", configAI.DefaultProvider)
+			} else {
+				color.Yellow("Your default provider is openai")
+			}
+			os.Exit(0)
+		}
+		// lowercase the provider name
+		providerName = strings.ToLower(providerName)
+
+		// Check if the provider is in the provider list
+		providerExists := false
+		for _, provider := range configAI.Providers {
+			if provider.Name == providerName {
+				providerExists = true
+			}
+		}
+		if !providerExists {
+			color.Red("Error: Provider %s does not exist", providerName)
+			os.Exit(1)
+		}
+		// Set the default provider
+		configAI.DefaultProvider = providerName
+
+		viper.Set("ai", configAI)
+		// Viper write config
+		err = viper.WriteConfig()
+		if err != nil {
+			color.Red("Error: %v", err)
+			os.Exit(1)
+		}
+		// Print acknowledgement
+		color.Green("Default provider set to %s", providerName)
+	},
+}
+
+func init() {
+	// provider name flag
+	defaultCmd.Flags().StringVarP(&providerName, "provider", "p", "", "The name of the provider to set as default")
+}