// Copyright 2019 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 (
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"
)

// Common flags
const (
	flagAll       flagName = "all"
	flagDryrun    flagName = "dryrun"
	flagVerbose   flagName = "verbose"
	flagAllErrors flagName = "all-errors"
	flagTrace     flagName = "trace"
	flagForce     flagName = "force"
	flagIgnore    flagName = "ignore"
	flagSimplify  flagName = "simplify"
	flagPackage   flagName = "package"
	flagInject    flagName = "inject"

	flagExpression  flagName = "expression"
	flagSchema      flagName = "schema"
	flagEscape      flagName = "escape"
	flagGlob        flagName = "name"
	flagRecursive   flagName = "recursive"
	flagList        flagName = "list"
	flagPath        flagName = "path"
	flagFiles       flagName = "files"
	flagProtoPath   flagName = "proto_path"
	flagWithContext flagName = "with-context"
	flagOut         flagName = "out"
	flagOutFile     flagName = "outfile"
)

func addOutFlags(f *pflag.FlagSet, allowNonCUE bool) {
	if allowNonCUE {
		f.String(string(flagOut), "",
			`output format (run 'cue filetype' for more info)`)
	}
	f.StringP(string(flagOutFile), "o", "",
		`filename or - for stdout with optional file prefix (run 'cue filetype' for more info)`)
}

func addGlobalFlags(f *pflag.FlagSet) {
	f.Bool(string(flagTrace), false,
		"trace computation")
	f.BoolP(string(flagSimplify), "s", false,
		"simplify output")
	f.BoolP(string(flagIgnore), "i", false,
		"proceed in the presence of errors")
	f.BoolP(string(flagVerbose), "v", false,
		"print information about progress")
	f.BoolP(string(flagAllErrors), "E", false, "print all available errors")
}

func addOrphanFlags(f *pflag.FlagSet) {
	f.StringP(string(flagPackage), "p", "", "package name for non-CUE files")
	f.StringP(string(flagSchema), "d", "",
		"expression to select schema for evaluating values in non-CUE files")
	f.StringArrayP(string(flagPath), "l", nil, "CUE expression for single path component")
	f.Bool(string(flagList), false, "concatenate multiple objects into a list")
	f.Bool(string(flagWithContext), false, "import as object with contextual data")
	f.StringArrayP(string(flagProtoPath), "I", nil, "paths in which to search for imports")
	f.StringP(string(flagGlob), "n", "", "glob filter for file names")
}

type flagName string

func (f flagName) Bool(cmd *Command) bool {
	v, _ := cmd.Flags().GetBool(string(f))
	return v
}

func (f flagName) String(cmd *Command) string {
	v, _ := cmd.Flags().GetString(string(f))
	return v
}

func (f flagName) StringArray(cmd *Command) []string {
	v, _ := cmd.Flags().GetStringArray(string(f))
	return v
}

type stringFlag struct {
	name  string
	short string
	text  string
	def   string
}

func (f *stringFlag) Add(cmd *cobra.Command) {
	cmd.Flags().StringP(f.name, f.short, f.def, f.text)
}

func (f *stringFlag) String(cmd *Command) string {
	v, err := cmd.Flags().GetString(f.name)
	if err != nil {
		return f.def
	}
	return v
}