package search

import (
	"b612.me/stario"
	"b612.me/starlog"
	"b612.me/startext"
	"bufio"
	"errors"
	"fmt"
	"github.com/spf13/cobra"
	"io/ioutil"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
)

var stFolder string
var stNum, stMax, stMin int
var stautoGBK, allowEmoji, onlyShowFileName bool

func init() {
	Cmd.Flags().StringVarP(&stFolder, "folder", "f", "./", "搜索的文件夹")
	Cmd.Flags().IntVarP(&stNum, "thread-num", "n", 5, "并发搜寻协程数")
	Cmd.Flags().BoolVarP(&allowEmoji, "allow-emoji", "e", false, "使用\\U输入Emoji")
	Cmd.Flags().BoolVarP(&stautoGBK, "autogbk", "g", false, "自动GBK识别")
	Cmd.Flags().BoolVarP(&onlyShowFileName, "only-show-filename", "o", false, "只显示文件名")
	Cmd.Flags().IntVar(&stMax, "max", 0, "行最大字数")
	Cmd.Flags().IntVar(&stMin, "min", 0, "行最小字数")
}

var Cmd = &cobra.Command{
	Use:   "st",
	Short: "搜索文件中特定字符串",
	Long:  "搜索文件中特定字符串",
	Run: func(this *cobra.Command, args []string) {
		if len(args) != 2 {
			starlog.Errorln("应当传入两个参数，搜寻文件后缀和搜寻文本")
			os.Exit(1)
		}
		if allowEmoji {
			args[1], _ = replaceUnicodeEmoji(args[1])
		}
		err := searchText(stFolder, args[0], args[1], stNum, stautoGBK, stMax, stMin, onlyShowFileName)
		if err != nil {
			os.Exit(2)
		}
		return
	},
}

func replaceUnicodeEmoji(text string) (string, error) {
	// 查找含有 \U 开头的代码点
	re := regexp.MustCompile(`\\U([0-9A-Fa-f]{1,8})`)
	matches := re.FindAllStringSubmatch(text, -1)

	// 如果没有匹配到任何内容，则直接返回原始文本
	if matches == nil {
		return text, nil
	}

	// 将代码点替换为相应的表情符号
	for _, match := range matches {
		emoji, err := unicodeToEmoji(match[1])
		if err != nil {
			return "", err
		}
		text = strings.Replace(text, match[0], emoji, -1)
	}

	return text, nil
}

func unicodeToEmoji(codepoint string) (string, error) {
	// 将16进制字符串转换为 uint32 类型
	hexcode, err := strconv.ParseUint(codepoint, 16, 32)
	if err != nil {
		return "", err
	}

	// 检查代码点是否位于Unicode BMP（基本多文本平面）中
	if hexcode > 0x10FFFF {
		return "", errors.New("invalid Unicode code point")
	}

	// 将 uint32 类型的代码点转换为 rune 类型
	r := rune(hexcode)

	// 将 rune 格式化为 8 位宽度的 16 进制数值并前置 0 填充
	emoji := fmt.Sprintf("%08X", hexcode)

	// 将 rune 类型的字符转换为对应的字符串表情符号
	emoji = string(r)

	return emoji, nil
}

func searchText(folder string, filematch string, text string, thread int, autoGBK bool, max, min int, onlyShowFileName bool) error {
	data, err := ioutil.ReadDir(folder)
	if err != nil {
		starlog.Errorln("read folder failed", folder, err)
		return err
	}
	wg := stario.NewWaitGroup(thread)
	searchFn := func(filepath string, text string) {
		//starlog.Debugln("searching", filepath, text)
		defer wg.Done()
		fp, err := os.Open(filepath)
		if err != nil {
			starlog.Errorln("open file failed", filepath, err)
			return
		}
		defer fp.Close()
		reader := bufio.NewReader(fp)
		count := 0
		for {
			origin, err := reader.ReadString('\n')
			count++
			if stautoGBK && startext.IsGBK([]byte(origin)) {
				originByte, _ := startext.GBK2UTF8([]byte(origin))
				origin = string(originByte)
			}
			origin = strings.TrimSpace(origin)
			if max != 0 && len(origin) > max {
				continue
			}
			if min != 0 && len(origin) < min {
				continue
			}
			if strings.Contains(origin, text) {
				if !onlyShowFileName {
					fmt.Printf("file:%s line:%d matched:%s\n", filepath, count, origin)
				} else {
					fmt.Printf("file:%s line:%d\n", filepath, count)
				}
			}
			if err != nil {
				break
			}
		}
	}
	for _, v := range data {
		if v.IsDir() {
			searchText(filepath.Join(folder, v.Name()), filematch, text, thread, autoGBK, stMax, stMin, onlyShowFileName)
		}
		filepath := filepath.Join(folder, v.Name())
		if matched, _ := regexp.MatchString(filematch, filepath); matched {
			wg.Add(1)
			go searchFn(filepath, text)
		}
	}
	wg.Wait()
	return nil
}