// Copyright © 2018 The Knative 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 commands

import (
	"fmt"
	"strings"

	servinglib "github.com/knative/client/pkg/serving"
	servingv1alpha1 "github.com/knative/serving/pkg/apis/serving/v1alpha1"
	"github.com/spf13/cobra"
)

type ConfigurationEditFlags struct {
	Image string
	Env   []string
}

func (p *ConfigurationEditFlags) AddFlags(command *cobra.Command) {
	command.Flags().StringVar(&p.Image, "image", "", "Image to run.")
	command.Flags().StringArrayVarP(&p.Env, "env", "e", []string{},
		"Environment variable to set. NAME=value; you may provide this flag "+
			"any number of times to set multiple environment variables.")
}

func (p *ConfigurationEditFlags) Apply(config *servingv1alpha1.ConfigurationSpec) error {
	envMap := map[string]string{}
	for _, pairStr := range p.Env {
		pairSlice := strings.SplitN(pairStr, "=", 2)
		if len(pairSlice) <= 1 {
			return fmt.Errorf(
				"--env argument requires a value that contains the '=' character; got %s",
				pairStr)
		}
		envMap[pairSlice[0]] = pairSlice[1]
	}
	err := servinglib.UpdateEnvVars(config, envMap)
	if err != nil {
		return err
	}
	err = servinglib.UpdateImage(config, p.Image)
	if err != nil {
		return err
	}
	return nil
}