package stringx

import (
	"bytes"
	"encoding/json"
	"fmt"
	"reflect"
	"regexp"
	"regexp/syntax"
	"sort"
	"strconv"
	"strings"
	"unicode"
	"unsafe"

	"git.cloudyne.io/go/hiscaler-gox/slicex"
	"golang.org/x/text/width"
)

var (
	rxEmoji      = regexp.MustCompile(`[\x{1F3F4}](?:\x{E0067}\x{E0062}\x{E0077}\x{E006C}\x{E0073}\x{E007F})|[\x{1F3F4}](?:\x{E0067}\x{E0062}\x{E0073}\x{E0063}\x{E0074}\x{E007F})|[\x{1F3F4}](?:\x{E0067}\x{E0062}\x{E0065}\x{E006E}\x{E0067}\x{E007F})|[\x{1F3F4}](?:\x{200D}\x{2620}\x{FE0F})|[\x{1F3F3}](?:\x{FE0F}\x{200D}\x{1F308})|[\x{0023}\x{002A}\x{0030}\x{0031}\x{0032}\x{0033}\x{0034}\x{0035}\x{0036}\x{0037}\x{0038}\x{0039}](?:\x{FE0F}\x{20E3})|[\x{1F441}](?:\x{FE0F}\x{200D}\x{1F5E8}\x{FE0F})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F467}\x{200D}\x{1F467})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F467}\x{200D}\x{1F466})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F467})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F466}\x{200D}\x{1F466})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F466})|[\x{1F468}](?:\x{200D}\x{1F468}\x{200D}\x{1F467}\x{200D}\x{1F467})|[\x{1F468}](?:\x{200D}\x{1F468}\x{200D}\x{1F466}\x{200D}\x{1F466})|[\x{1F468}](?:\x{200D}\x{1F468}\x{200D}\x{1F467}\x{200D}\x{1F466})|[\x{1F468}](?:\x{200D}\x{1F468}\x{200D}\x{1F467})|[\x{1F468}](?:\x{200D}\x{1F468}\x{200D}\x{1F466})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F469}\x{200D}\x{1F467}\x{200D}\x{1F467})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F469}\x{200D}\x{1F466}\x{200D}\x{1F466})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F469}\x{200D}\x{1F467}\x{200D}\x{1F466})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F469}\x{200D}\x{1F467})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F469}\x{200D}\x{1F466})|[\x{1F469}](?:\x{200D}\x{2764}\x{FE0F}\x{200D}\x{1F469})|[\x{1F469}\x{1F468}](?:\x{200D}\x{2764}\x{FE0F}\x{200D}\x{1F468})|[\x{1F469}](?:\x{200D}\x{2764}\x{FE0F}\x{200D}\x{1F48B}\x{200D}\x{1F469})|[\x{1F469}\x{1F468}](?:\x{200D}\x{2764}\x{FE0F}\x{200D}\x{1F48B}\x{200D}\x{1F468})|[\x{1F468}\x{1F469}](?:\x{1F3FF}\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{1F3FE}\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{1F3FD}\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{1F3FC}\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{1F3FB}\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F9B3})|[\x{1F468}\x{1F469}](?:\x{1F3FF}\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{1F3FE}\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{1F3FD}\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{1F3FC}\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{1F3FB}\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F9B2})|[\x{1F468}\x{1F469}](?:\x{1F3FF}\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{1F3FE}\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{1F3FD}\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{1F3FC}\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{1F3FB}\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F9B1})|[\x{1F468}\x{1F469}](?:\x{1F3FF}\x{200D}\x{1F9B0})|[\x{1F468}\x{1F469}](?:\x{1F3FE}\x{200D}\x{1F9B0})|[\x{1F468}\x{1F469}](?:\x{1F3FD}\x{200D}\x{1F9B0})|[\x{1F468}\x{1F469}](?:\x{1F3FC}\x{200D}\x{1F9B0})|[\x{1F468}\x{1F469}](?:\x{1F3FB}\x{200D}\x{1F9B0})|[\x{1F468}\x{1F469}](?:\x{200D}\x{1F9B0})|[\x{1F575}\x{1F3CC}\x{26F9}\x{1F3CB}](?:\x{FE0F}\x{200D}\x{2640}\x{FE0F})|[\x{1F575}\x{1F3CC}\x{26F9}\x{1F3CB}](?:\x{FE0F}\x{200D}\x{2642}\x{FE0F})|[\x{1F46E}\x{1F575}\x{1F482}\x{1F477}\x{1F473}\x{1F471}\x{1F9D9}\x{1F9DA}\x{1F9DB}\x{1F9DC}\x{1F9DD}\x{1F64D}\x{1F64E}\x{1F645}\x{1F646}\x{1F481}\x{1F64B}\x{1F647}\x{1F926}\x{1F937}\x{1F486}\x{1F487}\x{1F6B6}\x{1F3C3}\x{1F9D6}\x{1F9D7}\x{1F9D8}\x{1F3CC}\x{1F3C4}\x{1F6A3}\x{1F3CA}\x{26F9}\x{1F3CB}\x{1F6B4}\x{1F6B5}\x{1F938}\x{1F93D}\x{1F93E}\x{1F939}](?:\x{1F3FF}\x{200D}\x{2640}\x{FE0F})|[\x{1F46E}\x{1F575}\x{1F482}\x{1F477}\x{1F473}\x{1F471}\x{1F9D9}\x{1F9DA}\x{1F9DB}\x{1F9DC}\x{1F9DD}\x{1F64D}\x{1F64E}\x{1F645}\x{1F646}\x{1F481}\x{1F64B}\x{1F647}\x{1F926}\x{1F937}\x{1F486}\x{1F487}\x{1F6B6}\x{1F3C3}\x{1F9D6}\x{1F9D7}\x{1F9D8}\x{1F3CC}\x{1F3C4}\x{1F6A3}\x{1F3CA}\x{26F9}\x{1F3CB}\x{1F6B4}\x{1F6B5}\x{1F938}\x{1F93D}\x{1F93E}\x{1F939}](?:\x{1F3FE}\x{200D}\x{2640}\x{FE0F})|[\x{1F46E}\x{1F575}\x{1F482}\x{1F477}\x{1F473}\x{1F471}\x{1F9D9}\x{1F9DA}\x{1F9DB}\x{1F9DC}\x{1F9DD}\x{1F64D}\x{1F64E}\x{1F645}\x{1F646}\x{1F481}\x{1F64B}\x{1F647}\x{1F926}\x{1F937}\x{1F486}\x{1F487}\x{1F6B6}\x{1F3C3}\x{1F9D6}\x{1F9D7}\x{1F9D8}\x{1F3CC}\x{1F3C4}\x{1F6A3}\x{1F3CA}\x{26F9}\x{1F3CB}\x{1F6B4}\x{1F6B5}\x{1F938}\x{1F93D}\x{1F93E}\x{1F939}](?:\x{1F3FD}\x{200D}\x{2640}\x{FE0F})|[\x{1F46E}\x{1F575}\x{1F482}\x{1F477}\x{1F473}\x{1F471}\x{1F9D9}\x{1F9DA}\x{1F9DB}\x{1F9DC}\x{1F9DD}\x{1F64D}\x{1F64E}\x{1F645}\x{1F646}\x{1F481}\x{1F64B}\x{1F647}\x{1F926}\x{1F937}\x{1F486}\x{1F487}\x{1F6B6}\x{1F3C3}\x{1F9D6}\x{1F9D7}\x{1F9D8}\x{1F3CC}\x{1F3C4}\x{1F6A3}\x{1F3CA}\x{26F9}\x{1F3CB}\x{1F6B4}\x{1F6B5}\x{1F938}\x{1F93D}\x{1F93E}\x{1F939}](?:\x{1F3FC}\x{200D}\x{2640}\x{FE0F})|[\x{1F46E}\x{1F575}\x{1F482}\x{1F477}\x{1F473}\x{1F471}\x{1F9D9}\x{1F9DA}\x{1F9DB}\x{1F9DC}\x{1F9DD}\x{1F64D}\x{1F64E}\x{1F645}\x{1F646}\x{1F481}\x{1F64B}\x{1F647}\x{1F926}\x{1F937}\x{1F486}\x{1F487}\x{1F6B6}\x{1F3C3}\x{1F9D6}\x{1F9D7}\x{1F9D8}\x{1F3CC}\x{1F3C4}\x{1F6A3}\x{1F3CA}\x{26F9}\x{1F3CB}\x{1F6B4}\x{1F6B5}\x{1F938}\x{1F93D}\x{1F93E}\x{1F939}](?:\x{1F3FB}\x{200D}\x{2640}\x{FE0F})|[\x{1F46E}\x{1F9B8}\x{1F9B9}\x{1F482}\x{1F477}\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{1F1F9}\x{1F1FA}\x{1F1FB}\x{1F1FF}](?:\x{1F1E6})|[\x{00A9}\x{00AE}\x{203C}\x{2049}\x{2122}\x{2139}\x{2194}-\x{2199}\x{21A9}-\x{21AA}\x{231A}-\x{231B}\x{2328}\x{23CF}\x{23E9}-\x{23F3}\x{23F8}-\x{23FA}\x{24C2}\x{25AA}-\x{25AB}\x{25B6}\x{25C0}\x{25FB}-\x{25FE}\x{2600}-\x{2604}\x{260E}\x{2611}\x{2614}-\x{2615}\x{2618}\x{261D}\x{2620}\x{2622}-\x{2623}\x{2626}\x{262A}\x{262E}-\x{262F}\x{2638}-\x{263A}\x{2640}\x{2642}\x{2648}-\x{2653}\x{2660}\x{2663}\x{2665}-\x{2666}\x{2668}\x{267B}\x{267E}-\x{267F}\x{2692}-\x{2697}\x{2699}\x{269B}-\x{269C}\x{26A0}-\x{26A1}\x{26AA}-\x{26AB}\x{26B0}-\x{26B1}\x{26BD}-\x{26BE}\x{26C4}-\x{26C5}\x{26C8}\x{26CE}-\x{26CF}\x{26D1}\x{26D3}-\x{26D4}\x{26E9}-\x{26EA}\x{26F0}-\x{26F5}\x{26F7}-\x{26FA}\x{26FD}\x{2702}\x{2705}\x{2708}-\x{270D}\x{270F}\x{2712}\x{2714}\x{2716}\x{271D}\x{2721}\x{2728}\x{2733}-\x{2734}\x{2744}\x{2747}\x{274C}\x{274E}\x{2753}-\x{2755}\x{2757}\x{2763}-\x{2764}\x{2795}-\x{2797}\x{27A1}\x{27B0}\x{27BF}\x{2934}-\x{2935}\x{2B05}-\x{2B07}\x{2B1B}-\x{2B1C}\x{2B50}\x{2B55}\x{3030}\x{303D}\x{3297}\x{3299}\x{1F004}\x{1F0CF}\x{1F170}-\x{1F171}\x{1F17E}-\x{1F17F}\x{1F18E}\x{1F191}-\x{1F19A}\x{1F201}-\x{1F202}\x{1F21A}\x{1F22F}\x{1F232}-\x{1F23A}\x{1F250}-\x{1F251}\x{1F300}-\x{1F321}\x{1F324}-\x{1F393}\x{1F396}-\x{1F397}\x{1F399}-\x{1F39B}\x{1F39E}-\x{1F3F0}\x{1F3F3}-\x{1F3F5}\x{1F3F7}-\x{1F3FA}\x{1F400}-\x{1F4FD}\x{1F4FF}-\x{1F53D}\x{1F549}-\x{1F54E}\x{1F550}-\x{1F567}\x{1F56F}-\x{1F570}\x{1F573}-\x{1F57A}\x{1F587}\x{1F58A}-\x{1F58D}\x{1F590}\x{1F595}-\x{1F596}\x{1F5A4}-\x{1F5A5}\x{1F5A8}\x{1F5B1}-\x{1F5B2}\x{1F5BC}\x{1F5C2}-\x{1F5C4}\x{1F5D1}-\x{1F5D3}\x{1F5DC}-\x{1F5DE}\x{1F5E1}\x{1F5E3}\x{1F5E8}\x{1F5EF}\x{1F5F3}\x{1F5FA}-\x{1F64F}\x{1F680}-\x{1F6C5}\x{1F6CB}-\x{1F6D2}\x{1F6E0}-\x{1F6E5}\x{1F6E9}\x{1F6EB}-\x{1F6EC}\x{1F6F0}\x{1F6F3}-\x{1F6F9}\x{1F910}-\x{1F93A}\x{1F93C}-\x{1F93E}\x{1F940}-\x{1F945}\x{1F947}-\x{1F970}\x{1F973}-\x{1F976}\x{1F97A}\x{1F97C}-\x{1F9A2}\x{1F9B0}-\x{1F9B9}\x{1F9C0}-\x{1F9C2}\x{1F9D0}-\x{1F9FF}]`)
	rxExtraSpace = regexp.MustCompile("\\s{2,}")
)

// IsEmpty 判断字符串是否为空
func IsEmpty(s string) bool {
	return len(s) == 0
}

func IsBlank(s string) bool {
	return s == "" || strings.TrimSpace(s) == ""
}

// ToNumber 字符串转换为唯一数字
// https://stackoverflow.com/questions/5459436/how-can-i-generate-a-unique-int-from-a-unique-string
func ToNumber(s string) int {
	number := 0
	runes := []rune(s)
	for i, r := range runes {
		x := 0
		if i != 0 {
			x = int(runes[i-1])
		}
		number += ((x << 16) | (x >> 16)) ^ int(r)
	}
	return number
}

func ContainsChinese(str string) bool {
	if str == "" {
		return false
	}

	for _, v := range str {
		if unicode.Is(unicode.Han, v) {
			return true
		}
	}
	return false
}

// ToNarrow Full width string to half width
func ToNarrow(str string) string {
	return width.Narrow.String(str)
}

// ToWiden Half with string to full width
func ToWiden(str string) string {
	return width.Widen.String(str)
}

// Split split word by special seps, use empty string if seps is empty
func Split(str string, separators ...string) []string {
	if len(separators) == 0 {
		return []string{str}
	}

	texts := make([]string, 0)
	if str != "" {
		n := len(separators)
		parts := strings.Split(str, separators[0])
		if n == 1 {
			texts = parts
		} else {
			n -= 2
			for i, sep := range separators[1:] {
				m := len(parts)
				for _, part := range parts {
					for _, s := range strings.Split(part, sep) {
						s = strings.TrimSpace(s)
						if s == "" {
							continue
						}
						if n == i {
							texts = append(texts, s)
						} else {
							parts = append(parts, s)
						}
					}
				}
				parts = append(parts[:0], parts[m:]...)
			}
		}
	}
	return texts
}

func String(value interface{}) string {
	switch val := value.(type) {
	case []byte:
		return string(val)
	case string:
		return val
	}
	v := reflect.ValueOf(value)
	switch v.Kind() {
	case reflect.Invalid:
		return ""
	case reflect.Bool:
		return strconv.FormatBool(v.Bool())
	case reflect.String:
		return v.String()
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return strconv.FormatInt(v.Int(), 10)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return strconv.FormatUint(v.Uint(), 10)
	case reflect.Float64:
		return strconv.FormatFloat(v.Float(), 'f', -1, 64)
	case reflect.Float32:
		return strconv.FormatFloat(v.Float(), 'f', -1, 32)
	case reflect.Ptr, reflect.Struct, reflect.Map, reflect.Slice, reflect.Array:
		if b, err := json.Marshal(v.Interface()); err == nil {
			return string(b)
		} else {
			return ""
		}
	default:
		return fmt.Sprintf("%v", value)
	}
}

// RemoveEmoji 清理 Emoji 表情
func RemoveEmoji(str string, trim bool) string {
	if trim {
		str = strings.TrimSpace(str)
	}
	if str != "" {
		str = rxEmoji.ReplaceAllString(str, "")
	}
	return str
}

// TrimAny 移除头部和尾部指定的内容
func TrimAny(s string, sets ...string) string {
	if s == "" || len(sets) == 0 {
		return s
	}

	trimSpace := false
	fixedSets := make([]string, 0)
	for _, set := range sets {
		n := 0
		for _, r := range set {
			if unicode.IsSpace(r) {
				n++
			}
		}
		if n == len(set) {
			trimSpace = true
		} else {
			fixedSets = append(fixedSets, set) // 不包括空白字符
		}
	}

	if trimSpace {
		s = strings.TrimSpace(s)
		if s == "" {
			return s
		}
	}

	if len(fixedSets) == 0 {
		return s
	}

	// 降序
	sort.Slice(fixedSets, func(i, j int) bool {
		return len(fixedSets[i]) > len(fixedSets[j])
	})

	minL := len(fixedSets[0])
	for i := range fixedSets {
		n := len(fixedSets[i])
		if n < minL {
			minL = n
		}
	}

	index := -1
	for i, set := range fixedSets {
		if len(set) == minL {
			index = i
			break
		}
	}

	values := [][]string{fixedSets[0:index], slicex.StringSliceReverse(fixedSets)}
	for _, value := range values {
		for {
			hitCounts := 0
			for _, set := range value {
				setLen := len(set)
				ss := []string{set}
				start := StartsWith(s, ss, false)
				if start {
					s = s[setLen:]
					if trimSpace {
						s = strings.TrimSpace(s)
					}
				}
				end := EndsWith(s, ss, false)
				if end {
					if len(s) > setLen {
						s = s[0 : len(s)-setLen]
					}
					if trimSpace {
						s = strings.TrimSpace(s)
					}
				}
				if s == "" {
					hitCounts = 0
					break
				} else if start || end {
					hitCounts++
				}
			}
			if hitCounts == 0 {
				break
			}
		}
	}

	return s
}

// RemoveExtraSpace 移除多余的空格
func RemoveExtraSpace(s string) string {
	if s != "" {
		s = strings.TrimSpace(s)
	}
	if s == "" {
		return s
	}
	return rxExtraSpace.ReplaceAllLiteralString(strings.Replace(s, "　", " ", -1), " ")
}

func ToBytes(s string) []byte {
	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
	bh := reflect.SliceHeader{
		Data: sh.Data,
		Len:  sh.Len,
		Cap:  sh.Len,
	}
	return *(*[]byte)(unsafe.Pointer(&bh))
}

// WordMatched 判断 s 中是否包含指定的 words 单词
// 对于英文必须是单词形式，比如 he 不能匹配 hello world，只能匹配 hello|world
// 如果是中文的话，则会使用 Index 进行判断，不等于 -1 则判断为匹配
func WordMatched(s string, words []string, caseSensitive bool) bool {
	if s == "" || len(words) == 0 {
		return false
	}

	var b strings.Builder
	if !caseSensitive {
		b.WriteString("(?i)")
	}
	b.WriteString(`(^|([\s\t\n]+))(`)
	replacer := strings.NewReplacer(
		"\\\\", "\\\\\\",
		"(", "\\(",
		"|", "\\|",
		")", "\\)",
		"^", "\\^",
		"$", "\\$",
		".", "\\.",
		"[", "\\[",
		"*", "\\*",
		"+", "\\+",
		"?", "\\?",
		"{", "\\{",
		"-", "\\-",
		",", "\\,",
	)
	for i, word := range words {
		n := 0
		word = strings.TrimSpace(word)
		for _, w := range word {
			if !syntax.IsWordChar(w) {
				n++
			}
		}
		if n == len(word) {
			return false
		}

		if i != 0 {
			b.WriteString("|")
		}
		b.WriteString(replacer.Replace(word))
	}
	b.WriteString(`)($|([\s\t\n]+))`)
	if re, err := regexp.Compile(b.String()); err == nil {
		if re.MatchString(s) {
			return true
		}
	}

	// 正则匹配失败后还需要判断是否为中文，为中文的话则直接使用 Index 函数进行判断是否存在
	if !caseSensitive {
		s = strings.ToLower(s)
	}
	for _, word := range words {
		if ContainsChinese(word) {
			if !caseSensitive {
				word = strings.ToLower(word)
			}
			if strings.Index(s, word) != -1 {
				return true
			}
		}
	}
	return false
}

func StartsWith(s string, ss []string, caseSensitive bool) bool {
	n := len(s)
	if ss == nil || n == 0 {
		return true
	}

	has := false
	for _, prefix := range ss {
		m := len(prefix)
		if m == 0 {
			has = true
		} else {
			if m <= n {
				if caseSensitive {
					has = strings.HasPrefix(s, prefix)
				} else {
					ns := s
					if n-m > 0 {
						ns = s[0:m]
					}
					has = strings.EqualFold(ns, prefix)
				}
			}
		}
		if has {
			break
		}
	}
	return has
}

func EndsWith(s string, ss []string, caseSensitive bool) bool {
	n := len(s)
	if ss == nil || n == 0 {
		return true
	}

	has := false
	for _, suffix := range ss {
		m := len(suffix)
		if m == 0 {
			has = true
		} else {
			if m <= n {
				if caseSensitive {
					has = strings.HasSuffix(s, suffix)
				} else {
					ns := s
					if n-m > 0 {
						ns = s[n-m:]
					}
					has = strings.EqualFold(ns, suffix)
				}
			}
		}
		if has {
			break
		}
	}
	return has
}

func Contains(s string, ss []string, caseSensitive bool) bool {
	if len(ss) == 0 {
		return false
	}

	if !caseSensitive {
		s = strings.ToLower(s)
	}
	for _, substr := range ss {
		if substr == "" {
			return true
		} else {
			if !caseSensitive {
				substr = strings.ToLower(substr)
			}
			if strings.Contains(s, substr) {
				return true
			}
		}
	}
	return false
}

func QuoteMeta(s string) string {
	if s == "" {
		return s
	}

	var buf bytes.Buffer
	buf.Grow(len(s))
	for _, char := range s {
		switch char {
		case '.', '+', '\\', '(', ')', '[', ']', '$', '^', '*', '?':
			buf.WriteRune('\\')
		}
		buf.WriteRune(char)
	}
	return buf.String()
}

// HexToByte 16进制字符串转 []byte
// Like pack("H*", string) in PHP
func HexToByte(hex string) []byte {
	length := len(hex) / 2
	bytes := make([]byte, length)
	rs := []rune(hex)

	for i := 0; i < length; i++ {
		s := string(rs[i*2 : i*2+2])
		value, _ := strconv.ParseInt(s, 16, 10)
		bytes[i] = byte(value & 0xFF)
	}
	return bytes
}

// SequentialWordFields
// 将 s 字符串根据指定的分隔符分隔为 1 - n 个连续单词组合的词组
// 单词前后的非字母和数字将会移除掉（比如 help? 将会变成 help），单词中间的则不会处理（a?b 包含在单词中间的 ? 不会处理）
//
// stringx.SequentialWordFields("this is a string, are you sure?", 1, ",") => ["this", "is", "a", "string", "are", "you", "sure"]
// stringx.SequentialWordFields("this is a string, are you sure?", 2, ",") => ["this", "is", "a", "string", "are", "you", "sure", "this is", "is a", "a string", "are you", "you sure"]
func SequentialWordFields(s string, n int, separators ...string) []string {
	s = strings.TrimSpace(s)
	if s == "" {
		return nil
	}

	fields := make(map[string]string, 0)
	sections := Split(s, separators...)
	fnCleanWord := func(word string) string {
		if word == "" {
			return ""
		}
		return strings.TrimFunc(word, func(r rune) bool {
			return !unicode.IsLetter(r) && !unicode.IsNumber(r)
		})
	}
	sb := strings.Builder{}
	for _, section := range sections {
		words := strings.Fields(section)
		maxN := len(words)
		validN := n
		if n > maxN {
			validN = maxN
		}
		for i, word := range words {
			word = fnCleanWord(word)
			if word == "" {
				continue
			}
			fieldKey := strings.ToLower(word)
			if _, ok := fields[fieldKey]; !ok {
				fields[fieldKey] = word
			}
			if n > 1 {
				validN = i + n
				if validN > maxN {
					validN = maxN
				}
				for jj := validN; jj > i; jj-- {
					sb.Reset()
					for ii := i; ii < jj; ii++ {
						w := fnCleanWord(words[ii])
						if w != "" {
							sb.WriteString(w)
							if ii < jj-1 {
								sb.WriteRune(' ')
							}
						}
					}
					if sb.Len() > 0 {
						fieldKey = strings.ToLower(sb.String())
						if _, ok := fields[fieldKey]; !ok {
							fields[fieldKey] = sb.String()
						}
					}
				}
			}
		}
	}
	if len(fields) == 0 {
		return nil
	}
	items := make([]string, len(fields))
	i := 0
	for _, v := range fields {
		items[i] = v
		i++
	}
	return items
}

// Len 获取字符串长度（一个中文算 1）
func Len(s string) int {
	return len([]rune(s))
}

// UpperFirst 首字母大写
func UpperFirst(s string) string {
	r := []rune(s)
	if len(s) > 0 && unicode.IsLetter(r[0]) && unicode.IsLower(r[0]) {
		r[0] -= 32
		return string(r)
	}
	return s
}

// LowerFirst 首字母小写
func LowerFirst(s string) string {
	r := []rune(s)
	if len(s) > 0 && unicode.IsLetter(r[0]) && unicode.IsUpper(r[0]) {
		r[0] += 32
		return string(r)
	}
	return s
}