package utils

import (
	"encoding/binary"
	"errors"
	"f1-game/internal/types"
	"math/rand"
	"os"
	"strings"
	"unicode/utf8"

	cherryFile "github.com/cherry-game/cherry/extend/file"
	cstring "github.com/cherry-game/cherry/extend/string"
)

func GetI32MapRandKey(maps map[int32]int32) (int32, int32, bool) {
	var sortKeys []int32
	for k := range maps {
		sortKeys = append(sortKeys, k)
	}

	randIndex := int32(rand.Intn(len(maps) - 1))
	randKey := sortKeys[randIndex]

	val, found := maps[randKey]
	if found {
		return randKey, val, true
	}

	return 0, 0, false
}

func ListDir(dirPath string, suffix string) (files []string, err error) {
	files = make([]string, 0, 10)

	judgePath, found := cherryFile.JudgePath(dirPath)
	if !found {
		return nil, errors.New("path error")
	}

	dir, err := os.ReadDir(judgePath)
	if err != nil {
		return nil, err
	}

	suffix = strings.ToLower(suffix)
	for _, fi := range dir {
		if fi.IsDir() {
			continue
		}
		if strings.HasSuffix(strings.ToLower(fi.Name()), suffix) {
			files = append(files, fi.Name())
		}
	}

	return files, nil
}

// CutLength 截取指定长度的字符串
func CutLength(str string, length int) string {
	// var i, n int
	// for i = range str {
	// 	if length == n {
	// 		break
	// 	}
	// 	n++
	// }

	// return str[:i]

	if utf8.RuneCountInString(str) <= length {
		return str
	}

	return string([]rune(str)[:length])
}

func SubStr(str string, start int, length int) (result string) {
	s := []rune(str)
	total := len(s)
	if total == 0 {
		return
	}
	// 允许从尾部开始计算
	if start < 0 {
		start = total + start
		if start < 0 {
			return
		}
	}
	if start > total {
		return
	}
	// 到末尾
	if length < 0 {
		length = total
	}

	end := start + length
	if end > total {
		result = string(s[start:])
	} else {
		result = string(s[start:end])
	}

	return
}

// 检查字符长度是否有效
func CheckStrLen(str string, lenLimit int32) bool {
	strLen := int32(utf8.RuneCountInString(str))

	//判断字符长度是否有效
	if strLen < 1 {
		return false
	}

	//判断字符长度是否超出限制
	if strLen > lenLimit {
		return false
	}

	return true
}

func GetPointID(x, y int32) int64 {
	return int64(x)<<32 | int64(y)
}

// 计算两个矩形区域的交叉区域
func GetCrossArea(area1Min, area1Max, area2Min, area2Max types.Point) (leftTop, rightBottom types.Point, ok bool) {
	// 计算投影
	leftTop.X = max(area1Min.X, area2Min.X)
	leftTop.Y = max(area1Min.Y, area2Min.Y)
	rightBottom.X = min(area1Max.X, area2Max.X)
	rightBottom.Y = min(area1Max.Y, area2Max.Y)

	// 判断是否有交集
	ok = leftTop.X < rightBottom.X && leftTop.Y < rightBottom.Y

	return
}

func Int64ToBytesFixed(n int64, byteOrder binary.ByteOrder) []byte {
	buf := make([]byte, 8) // int64占8字节
	byteOrder.PutUint64(buf, uint64(n))
	return buf
}

// ToStringSlice 将任意类型转换为字符串切片
func ToStringSlice(val ...any) []string {
	var result []string
	for _, item := range val {
		v := cstring.ToString(item)
		result = append(result, v)
	}
	return result
}