// Command chdigeststat 判断 etc/storydigest/{scene,digest}.etc 当前处于哪种状态：
//   - 已停用：所有段落都指向 blackBoardScene.ani（占位黑屏）
//   - 正常：段落指向 origin_cinematic_NN.avi 等真实影片
//
// 用法:
//
//	go run ./cmd/scratch/chdigeststat -pvf <Script.pvf>
package main

import (
	"encoding/binary"
	"flag"
	"fmt"
	"os"
	"strings"

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

func main() {
	pvfPath := flag.String("pvf", "", "Script.pvf 路径")
	flag.Parse()
	if *pvfPath == "" {
		fmt.Fprintln(os.Stderr, "需要 -pvf")
		os.Exit(2)
	}
	archive, err := platformpvf.Open(*pvfPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "打开 PVF 失败:", err)
		os.Exit(1)
	}

	// 需要统计的字符串：黑屏占位 + 前 13 个章节影片
	names := []string{
		"etc/StoryDigest/Animation/blackBoardScene.ani",
	}
	for i := 0; i < 13; i++ {
		names = append(names, fmt.Sprintf("Video/movie/origin_cinematic_%02d.avi", i))
	}
	magic := archive.FindStringMagicOffsets(names)

	for _, rel := range []string{"etc/storydigest/scene.etc", "etc/storydigest/digest.etc"} {
		raw, err := archive.ReadRaw(rel)
		if err != nil {
			fmt.Printf("%s\t读取失败: %v\n", rel, err)
			continue
		}
		fmt.Printf("=== %s  %d 字节\n", rel, len(raw))
		for _, name := range names {
			off, ok := magic[name]
			if !ok {
				fmt.Printf("    %-46s (池中未找到)\n", name)
				continue
			}
			count := countU32LE(raw, uint32(off))
			if count > 0 || strings.Contains(name, "blackBoard") {
				label := name
				if len(label) > 46 {
					label = label[:46]
				}
				fmt.Printf("    %-46s 引用 %d 次  (magic=0x%08X)\n", label, count, off)
			}
		}
	}
}

// countU32LE 统计 raw 里 4 字节小端整数的出现次数。
func countU32LE(raw []byte, value uint32) int {
	count := 0
	for i := 0; i+4 <= len(raw); i++ {
		if binary.LittleEndian.Uint32(raw[i:i+4]) == value {
			count++
		}
	}
	return count
}