// Copyright (C) 2021-2023 YumeMichi
//
// SPDX-License-Identifier: Apache-2.0
package utils

import (
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"log"
	"os"
	"sync"
)

var (
	rwMutex sync.RWMutex
)

func PathExists(path string) bool {
	_, err := os.Stat(path)
	return err == nil || os.IsExist(err)
}

func ReadAllText(path string) string {
	rwMutex.RLock()
	defer rwMutex.RUnlock()

	b, err := os.ReadFile(path)
	if err != nil {
		return ""
	}
	return string(b)
}

func WriteAllText(path, text string) {
	rwMutex.Lock()
	defer rwMutex.Unlock()

	_ = os.WriteFile(path, []byte(text), 0644)
}

func XOR(s1, s2 []byte) []byte {
	n := min(len(s1), len(s2))

	res := make([]byte, n)
	for i, b := range s1[:n] {
		res[i] = b ^ s2[i]
	}
	return res
}

func RandomStr(length int) string {
	if length <= 0 {
		return ""
	}

	mRand := make([]byte, length)
	if _, err := rand.Read(mRand); err != nil {
		return ""
	}
	return hex.EncodeToString(mRand)[:length]
}

func ToJSON(data any) string {
	b, err := json.Marshal(data)
	if err != nil {
		log.Println(err.Error())
		return "{}"
	}
	return string(b)
}

func PrintJSON(data any) {
	b, err := json.MarshalIndent(data, "", "  ")
	if err != nil {
		return
	}
	fmt.Println(string(b))
}