// Copyright 2018 The CUE 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 cmd

import (
	"io/ioutil"
	"os"

	"cuelang.org/go/cue/format"
	"cuelang.org/go/cue/load"
	"cuelang.org/go/cue/parser"
	"github.com/spf13/cobra"
)

func newFmtCmd(c *Command) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "fmt [-s] [packages]",
		Short: "formats CUE configuration files",
		Long: `Fmt formats the given files or the files for the given packages in place
`,
		RunE: mkRunE(c, func(cmd *Command, args []string) error {
			for _, inst := range load.Instances(args, &load.Config{
				Tests: true,
				Tools: true,
			}) {
				if inst.Err != nil {
					exitOnErr(cmd, inst.Err, false)
					continue
				}
				all := []string{}
				all = append(all, inst.CUEFiles...)
				all = append(all, inst.ToolCUEFiles...)
				all = append(all, inst.TestCUEFiles...)
				for _, path := range all {
					fullpath := inst.Abs(path)

					stat, err := os.Stat(fullpath)
					if err != nil {
						return err
					}

					b, err := ioutil.ReadFile(fullpath)
					if err != nil {
						return err
					}

					opts := []format.Option{}
					if flagSimplify.Bool(cmd) {
						opts = append(opts, format.Simplify())
					}

					f, err := parser.ParseFile(fullpath, b, parser.ParseComments)
					if err != nil {
						return err
					}
					n := fix(f)

					b, err = format.Node(n, opts...)
					if err != nil {
						return err
					}

					err = ioutil.WriteFile(fullpath, b, stat.Mode())
					if err != nil {
						return err
					}
				}
			}
			return nil
		}),
	}
	return cmd
}