// Copyright 2017 The go-ethereum Authors
// (original work)
// Copyright 2024 The Erigon Authors
// (modifications)
// This file is part of Erigon.
//
// Erigon is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Erigon is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Erigon. If not, see <http://www.gnu.org/licenses/>.

// Package tracers contains the actual JavaScript tracer assets.
package tracers

import (
	"embed"
	"io/fs"
	"strings"
	"unicode"
)

//go:embed *.js
var files embed.FS

// Load reads the built-in JS tracer files embedded in the binary and
// returns a mapping of tracer name to source.
func Load() (map[string]string, error) {
	var assetTracers = make(map[string]string)
	err := fs.WalkDir(files, ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}
		b, err := fs.ReadFile(files, path)
		if err != nil {
			return err
		}
		name := camel(strings.TrimSuffix(path, ".js"))
		assetTracers[name] = string(b)
		return nil
	})
	return assetTracers, err
}

// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
	pieces := strings.Split(str, "_")
	for i := 1; i < len(pieces); i++ {
		pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
	}
	return strings.Join(pieces, "")
}
