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

package commands

import (
	"fmt"
	"io"
	"path/filepath"

	"github.com/spf13/cobra"
	"sigs.k8s.io/kustomize/cmd/config/ext"
	"sigs.k8s.io/kustomize/kyaml/setters2/settersutil"
)

// NewCreateSubstitutionRunner returns a command runner.
func NewCreateSubstitutionRunner(parent string) *CreateSubstitutionRunner {
	r := &CreateSubstitutionRunner{}
	cs := &cobra.Command{
		Use:    "create-subst DIR NAME",
		Args:   cobra.ExactArgs(2),
		PreRun: r.preRun,
		RunE:   r.runE,
	}
	cs.Flags().StringVar(&r.CreateSubstitution.FieldName, "field", "",
		"name of the field to set -- e.g. --field image")
	cs.Flags().StringVar(&r.CreateSubstitution.FieldValue, "field-value", "",
		"value of the field to create substitution for -- e.g. --field-value nginx:0.1.0")
	cs.Flags().StringVar(&r.CreateSubstitution.Pattern, "pattern", "",
		`substitution pattern -- e.g. --pattern \${my-image-setter}:\${my-tag-setter}`)
	cs.Flags().BoolVarP(&r.CreateSubstitution.RecurseSubPackages, "recurse-subpackages", "R", false,
		"creates substitution recursively in all the nested subpackages")
	_ = cs.MarkFlagRequired("pattern")
	_ = cs.MarkFlagRequired("field-value")
	fixDocs(parent, cs)
	r.Command = cs
	return r
}

func CreateSubstitutionCommand(parent string) *cobra.Command {
	return NewCreateSubstitutionRunner(parent).Command
}

type CreateSubstitutionRunner struct {
	Command            *cobra.Command
	CreateSubstitution settersutil.SubstitutionCreator
	OpenAPIFile        string
	Values             []string
}

func (r *CreateSubstitutionRunner) runE(c *cobra.Command, args []string) error {
	e := executeCmdOnPkgs{
		needOpenAPI:        true,
		writer:             c.OutOrStdout(),
		rootPkgPath:        args[0],
		recurseSubPackages: r.CreateSubstitution.RecurseSubPackages,
		cmdRunner:          r,
	}
	err := e.execute()
	if err != nil {
		return handleError(c, err)
	}

	return nil
}

func (r *CreateSubstitutionRunner) executeCmd(w io.Writer, pkgPath string) error {
	openAPIFileName, err := ext.OpenAPIFileName()
	if err != nil {
		return err
	}
	r.CreateSubstitution = settersutil.SubstitutionCreator{
		Name:               r.CreateSubstitution.Name,
		FieldName:          r.CreateSubstitution.FieldName,
		FieldValue:         r.CreateSubstitution.FieldValue,
		RecurseSubPackages: r.CreateSubstitution.RecurseSubPackages,
		Pattern:            r.CreateSubstitution.Pattern,
		OpenAPIFileName:    openAPIFileName,
		OpenAPIPath:        filepath.Join(pkgPath, openAPIFileName),
		ResourcesPath:      pkgPath,
	}

	err = r.CreateSubstitution.Create()
	if err != nil {
		// return err if RecurseSubPackages is false
		if !r.CreateSubstitution.RecurseSubPackages {
			return err
		} else {
			// print error message and continue if RecurseSubPackages is true
			fmt.Fprintf(w, "%s\n", err.Error())
		}
	} else {
		fmt.Fprintf(w, "created substitution %q\n", r.CreateSubstitution.Name)
	}
	return nil
}

func (r *CreateSubstitutionRunner) preRun(c *cobra.Command, args []string) {
	r.CreateSubstitution.Name = args[1]
}