// Copyright © 2020 The Tekton 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 clustertriggerbinding

import (
	"errors"
	"fmt"
	"text/tabwriter"

	"github.com/spf13/cobra"
	"github.com/tektoncd/cli/pkg/cli"
	"github.com/tektoncd/cli/pkg/clustertriggerbinding"
	"github.com/tektoncd/cli/pkg/formatted"
	"github.com/tektoncd/cli/pkg/printer"
	"github.com/tektoncd/triggers/pkg/apis/triggers/v1beta1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	cliopts "k8s.io/cli-runtime/pkg/genericclioptions"
)

const (
	emptyMsg = "No ClusterTriggerBindings found"
)

type listOptions struct {
	NoHeaders bool
}

func listCommand(p cli.Params) *cobra.Command {
	opts := &listOptions{}
	f := cliopts.NewPrintFlags("list")

	eg := `List all ClusterTriggerBindings:

	tkn clustertriggerbinding list

or

	tkn ctb ls
`

	c := &cobra.Command{
		Use:     "list",
		Aliases: []string{"ls"},
		Short:   "Lists ClusterTriggerBindings in a namespace",
		Annotations: map[string]string{
			"commandType": "main",
		},
		Example: eg,
		RunE: func(cmd *cobra.Command, args []string) error {
			cs, err := p.Clients()
			if err != nil {
				return err
			}

			tbs, err := clustertriggerbinding.List(cs, metav1.ListOptions{})
			if err != nil {
				return fmt.Errorf("failed to list ClusterTriggerBindings: %v", err)
			}

			output, err := cmd.LocalFlags().GetString("output")
			if err != nil {
				return errors.New("output option not set properly")
			}

			stream := &cli.Stream{
				Out: cmd.OutOrStdout(),
				Err: cmd.OutOrStderr(),
			}

			if output == "name" && tbs != nil {
				w := cmd.OutOrStdout()
				for _, pr := range tbs.Items {
					_, err := fmt.Fprintf(w, "clustertriggerbinding.triggers.tekton.dev/%s\n", pr.Name)
					if err != nil {
						return err
					}
				}
				return nil
			} else if output != "" {
				return printer.PrintObject(stream.Out, tbs, f)
			}

			if err = printFormatted(stream, tbs, p, opts.NoHeaders); err != nil {
				return fmt.Errorf("failed to print ClusterTriggerBindings: %v", err)
			}
			return nil

		},
	}

	f.AddFlags(c)
	c.Flags().BoolVar(&opts.NoHeaders, "no-headers", opts.NoHeaders, "do not print column headers with output (default print column headers with output)")
	return c
}

func printFormatted(s *cli.Stream, tbs *v1beta1.ClusterTriggerBindingList, p cli.Params, noHeaders bool) error {
	if len(tbs.Items) == 0 {
		fmt.Fprintln(s.Err, emptyMsg)
		return nil
	}

	w := tabwriter.NewWriter(s.Out, 0, 5, 3, ' ', tabwriter.TabIndent)
	if !noHeaders {
		fmt.Fprintln(w, "NAME\tAGE")
	}
	for _, tb := range tbs.Items {
		fmt.Fprintf(w, "%s\t%s\n",
			tb.Name,
			formatted.Age(&tb.CreationTimestamp, p.Time()),
		)
	}

	return w.Flush()
}
