// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package packages

import (
	"fmt"
	"strings"
)

var modes = [...]struct {
	mode LoadMode
	name string
}{
	{NeedName, "NeedName"},
	{NeedFiles, "NeedFiles"},
	{NeedCompiledGoFiles, "NeedCompiledGoFiles"},
	{NeedImports, "NeedImports"},
	{NeedDeps, "NeedDeps"},
	{NeedExportFile, "NeedExportFile"},
	{NeedTypes, "NeedTypes"},
	{NeedSyntax, "NeedSyntax"},
	{NeedTypesInfo, "NeedTypesInfo"},
	{NeedTypesSizes, "NeedTypesSizes"},
	{NeedForTest, "NeedForTest"},
	{NeedModule, "NeedModule"},
	{NeedEmbedFiles, "NeedEmbedFiles"},
	{NeedEmbedPatterns, "NeedEmbedPatterns"},
	{NeedTarget, "NeedTarget"},
}

func (mode LoadMode) String() string {
	if mode == 0 {
		return "LoadMode(0)"
	}
	var out []string
	// named bits
	for _, item := range modes {
		if (mode & item.mode) != 0 {
			mode ^= item.mode
			out = append(out, item.name)
		}
	}
	// unnamed residue
	if mode != 0 {
		if out == nil {
			return fmt.Sprintf("LoadMode(%#x)", int(mode))
		}
		out = append(out, fmt.Sprintf("%#x", int(mode)))
	}
	if len(out) == 1 {
		return out[0]
	}
	return "(" + strings.Join(out, "|") + ")"
}