// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0

package commands

import (
	"fmt"

	"github.com/olekukonko/tablewriter"
	"github.com/spf13/cobra"
	"sigs.k8s.io/kustomize/cmd/config/internal/generateddocs/commands"
	"sigs.k8s.io/kustomize/kyaml/kio"
	"sigs.k8s.io/kustomize/kyaml/setters"
)

// NewSetRunner returns a command runner.
func NewSetRunner(parent string) *SetRunner {
	r := &SetRunner{}
	c := &cobra.Command{
		Use:     "set DIR [NAME] [VALUE]",
		Args:    cobra.RangeArgs(1, 3),
		Short:   commands.SetShort,
		Long:    commands.SetLong,
		Example: commands.SetExamples,
		PreRunE: r.preRunE,
		RunE:    r.runE,
	}
	fixDocs(parent, c)
	r.Command = c

	return r
}

func SetCommand(parent string) *cobra.Command {
	return NewSetRunner(parent).Command
}

type SetRunner struct {
	Command *cobra.Command
	Lookup  setters.LookupSetters
	Perform setters.PerformSetters
}

func (r *SetRunner) preRunE(c *cobra.Command, args []string) error {
	if len(args) > 1 {
		r.Perform.Name = args[1]
		r.Lookup.Name = args[1]
	}
	if len(args) > 2 {
		r.Perform.Value = args[2]
	}

	return nil
}

func (r *SetRunner) runE(c *cobra.Command, args []string) error {

	if len(args) == 3 {
		return handleError(c, r.perform(c, args))
	}

	return handleError(c, r.lookup(c, args))
}

func (r *SetRunner) lookup(c *cobra.Command, args []string) error {
	// lookup the setters
	err := kio.Pipeline{
		Inputs:  []kio.Reader{&kio.LocalPackageReader{PackagePath: args[0]}},
		Filters: []kio.Filter{&r.Lookup},
	}.Execute()
	if err != nil {
		return err
	}

	table := tablewriter.NewWriter(c.OutOrStdout())
	table.SetRowLine(false)
	table.SetBorder(false)
	table.SetHeaderLine(false)
	table.SetColumnSeparator(" ")
	table.SetCenterSeparator(" ")
	table.SetAlignment(tablewriter.ALIGN_LEFT)
	table.SetHeader([]string{
		"NAME", "DESCRIPTION", "VALUE", "TYPE", "COUNT", "SETBY",
	})
	for i := range r.Lookup.SetterCounts {
		s := r.Lookup.SetterCounts[i]
		v := s.Value
		if s.Value == "" {
			v = s.Value
		}
		table.Append([]string{
			s.Name,
			"'" + s.Description + "'",
			v,
			fmt.Sprintf("%v", s.Type),
			fmt.Sprintf("%d", s.Count),
			s.SetBy,
		})
	}
	table.Render()
	return nil
}

// perform the setters
func (r *SetRunner) perform(c *cobra.Command, args []string) error {
	rw := &kio.LocalPackageReadWriter{
		PackagePath: args[0],
	}
	// perform the setters in the package
	err := kio.Pipeline{
		Inputs:  []kio.Reader{rw},
		Filters: []kio.Filter{&r.Perform},
		Outputs: []kio.Writer{rw},
	}.Execute()
	if err != nil {
		return err
	}
	fmt.Fprintf(c.OutOrStdout(), "set %d fields\n", r.Perform.Count)
	return nil
}