/*
文件名:Init.nut
路径:Init/Init.nut
创建日期:2024-05-07	17:38
文件用途:初始化操作
*/
function charPtrToInt(arr) {
    local value = ((arr[0]) << 0) |
        ((arr[1]) << 8) |
        ((arr[2]) << 16) |
        ((arr[3]) << 24);
    return value;
}

function CrcDecode(Ro, Length, crc32) {
    local num = 2175242257;
    for (local i = 0; i< Length; i += 4) {
        local Pos = Ro.tell();
        local anInt = charPtrToInt([Ro[Pos], Ro[Pos + 1], Ro[Pos + 2], Ro[Pos + 3]]);
        local val = (anInt ^ num ^ crc32);
        local jiemi = (val >> 6) | ((val << (32 - 6)) & 0xFFFFFFFF);
        Ro[Pos] = ((jiemi >> 0) & 0xFF);
        Ro[Pos + 1] = ((jiemi >> 8) & 0xFF);
        Ro[Pos + 2] = ((jiemi >> 16) & 0xFF);
        Ro[Pos + 3] = ((jiemi >> 24) & 0xFF);
        Ro.seek(4, 'c');
    }
}
//初始化PVF文件树
function InitPvfTreeHeader(HeaderRo) {
    //读取UUID的长度
    local UUID_LENGTH = HeaderRo.GetInt();
    //UUID  读 1 - 36位 构造 UTF8 string
    local UUID = HeaderRo.GetString(UUID_LENGTH);
    //版本号
    local Version = HeaderRo.GetInt();
    // 文件路径数据的大小
    local AlignedIndexHeaderSize = HeaderRo.GetInt();
    // 解密密钥
    local IndexHeaderCrc = HeaderRo.GetInt();
    // 文件数量
    local IndexSize = HeaderRo.GetInt();
    local FristPos = HeaderRo.tell();


    CrcDecode(HeaderRo, AlignedIndexHeaderSize, IndexHeaderCrc)

    local CurrPos = 0;
    ScriptData.StartPos = AlignedIndexHeaderSize + 56;

    for (local i = 0; i< IndexSize; i++) {
        HeaderRo.seek(FristPos + CurrPos);
        local FileNumber = HeaderRo.GetInt();
        local FilePathLength = HeaderRo.GetInt();
        local FileName = HeaderRo.GetString(FilePathLength);
        local FileLength = HeaderRo.GetInt();
        local Cre32 = HeaderRo.GetInt();
        local RelativeOffset = HeaderRo.GetInt();
        if (FileLength > 0) {
            local RealFileLength = (FileLength + 3) & 4294967292;
            ScriptData.PvfFileInfo[FileName] <- {
                ROffset = RelativeOffset,
                Cr32 = Cre32,
                Length = RealFileLength,
            }
        }

        CurrPos += 20;
        CurrPos += FilePathLength;
    }
}

//初始化PVF数据 文件树初始化完成以后被调用
function CB_InitPvfData() {
    //文件
    local FileIo = null;
    try {
        FileIo = file("Script.pvf", "rb");
    } catch (exception) {
        error("打不开Script文件!");
    }
    if (!FileIo) return;
    local FileRo = BlobEx(FileIo.readblob(FileIo.len()));
    InitPvfTreeHeader(FileRo);


    FileIo.close();


    InitStringBin(FileRo);
    InitLoadString(FileRo);

    local AllFileStartPos = ScriptData.StartPos;

    foreach(FilePath, Info in ScriptData.PvfFileInfo) {

        FileRo.seek(AllFileStartPos + Info.ROffset);
        CrcDecode(FileRo, Info.Length, Info.Cr32);
        //解密完需要重新调整指针位置
        FileRo.seek(AllFileStartPos + Info.ROffset);
        //构建AniMap
        if (endswith(FilePath, ".ani") && !endswith(FilePath, ".als")) {
            try {
                ScriptData.Ani[FilePath] <- InitPvfAni(FileRo);
            } catch (exception) {
                // if (FilePath == "monster/goblin/animation_goblin2/damage2.ani") print("Ani :" + FilePath + "加载错误");
                // print(exception);
                // print("Ani :" + FilePath + "加载错误");
            }
            // ScriptData.RemoveFileInfo(FilePath); //不知道为什么删除脚本会删多 貌似和识别有点关系 有空再修
        }
    }

    ScriptData.IO = FileRo;

    // print("初始化Ani完成数量: " + ScriptData.Ani.len());

    ScriptData.Init();
}