// 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"
	flagStrict    flagName = "strict"
	flagSimplify  flagName = "simplify"
	flagPackage   flagName = "package"
	flagInject    flagName = "inject"

	flagExpression  flagName = "expression"
	flagSchema      flagName = "schema"
	flagEscape      flagName = "escape"
	flagGlob        flagName = "name"
	flagRecursive   flagName = "recursive"
	flagMerge       flagName = "merge"
	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 filetypes' for more info)`)
	}
	f.StringP(string(flagOutFile), "o", "",
		`filename or - for stdout with optional file prefix (run 'cue filetypes' 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.Bool(string(flagStrict), false,
		"report errors for lossy mappings")
	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")
	f.Bool(string(flagMerge), true, "merge non-CUE files")
}

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
}