// pvfbinsearch 在 PVF 指定前缀的成员里按字节模式搜索（支持 UTF-16LE/ANSI），用于定位字符串表。
package main

import (
	"bytes"
	"encoding/hex"
	"flag"
	"fmt"
	"strings"

	platformpvf "longheng.io/server/internal/platform/pvf"
)

func main() {
	pvfPath := flag.String("pvf", "", "input PVF")
	prefix := flag.String("prefix", "", "path prefix filter")
	patternHex := flag.String("hex", "", "hex byte pattern")
	max := flag.Int("max", 20, "max matches")
	flag.Parse()
	if *pvfPath == "" || *patternHex == "" {
		fmt.Println("need -pvf and -hex")
		return
	}
	pattern, err := hex.DecodeString(strings.ReplaceAll(*patternHex, " ", ""))
	if err != nil {
		panic(err)
	}
	archive, err := platformpvf.Open(*pvfPath)
	if err != nil {
		panic(err)
	}
	found := 0
	scanned := 0
	archive.RangePaths(func(path string) bool {
		if *prefix != "" && !strings.HasPrefix(path, *prefix) {
			return true
		}
		file, ok := archive.FindFile(path)
		if !ok {
			return true
		}
		raw, err := archive.FileRaw(file.Index)
		if err != nil {
			return true
		}
		scanned++
		if idx := bytes.Index(raw, pattern); idx >= 0 {
			found++
			fmt.Printf("MATCH %s offset=%d size=%d\n", path, idx, len(raw))
			if found >= *max {
				return false
			}
		}
		return true
	})
	fmt.Printf("scanned=%d found=%d\n", scanned, found)
}