/*
Copyright 2019 The Kubernetes 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 remove

import (
	"errors"
	"path/filepath"
	"sigs.k8s.io/kustomize/v3/pkg/pgmconfig"

	"github.com/spf13/cobra"
	"sigs.k8s.io/kustomize/v3/pkg/commands/kustfile"
	"sigs.k8s.io/kustomize/v3/pkg/fs"
)

type removeResourceOptions struct {
	resourceFilePaths []string
}

// newCmdRemoveResource remove the name of a file containing a resource to the kustomization file.
func newCmdRemoveResource(fsys fs.FileSystem) *cobra.Command {
	var o removeResourceOptions

	cmd := &cobra.Command{
		Use:   "resource",
		Short: "Removes one or more resource file paths from " + pgmconfig.KustomizationFileNames[0],
		Example: `
		remove resource my-resource.yml
		remove resource resource1.yml resource2.yml resource3.yml
		remove resource resources/*.yml
		`,
		RunE: func(cmd *cobra.Command, args []string) error {
			err := o.Validate(args)
			if err != nil {
				return err
			}
			err = o.Complete(cmd, args)
			if err != nil {
				return err
			}
			return o.RunRemoveResource(fsys)
		},
	}
	return cmd
}

// Validate validates removeResource command.
func (o *removeResourceOptions) Validate(args []string) error {
	if len(args) == 0 {
		return errors.New("must specify a resource file")
	}
	o.resourceFilePaths = args
	return nil
}

// Complete completes removeResource command.
func (o *removeResourceOptions) Complete(cmd *cobra.Command, args []string) error {
	return nil
}

// RunRemoveResource runs Resource command (do real work).
func (o *removeResourceOptions) RunRemoveResource(fSys fs.FileSystem) error {

	mf, err := kustfile.NewKustomizationFile(fSys)
	if err != nil {
		return err
	}

	m, err := mf.Read()
	if err != nil {
		return err
	}

	resources, err := globPatterns(m.Resources, o.resourceFilePaths)
	if err != nil {
		return err
	}

	if len(resources) == 0 {
		return nil
	}

	newResources := make([]string, 0, len(m.Resources))
	for _, resource := range m.Resources {
		if kustfile.StringInSlice(resource, resources) {
			continue
		}
		newResources = append(newResources, resource)
	}

	m.Resources = newResources
	return mf.Write(m)
}

func globPatterns(resources []string, patterns []string) ([]string, error) {
	var result []string
	for _, pattern := range patterns {
		for _, resource := range resources {
			match, err := filepath.Match(pattern, resource)
			if err != nil {
				return nil, err
			}
			if !match {
				continue
			}
			result = append(result, resource)
		}
	}
	return result, nil
}