#!/usr/bin/python3
# mkhdmenu.py - build an Atari ST (gaming) harddisk image

# Useful info:
# https://people.debian.org/~glaubitz/Atari_HD_File_Sytem_Reference_Guide.pdf
# https://teslabs.com/openplayer/docs/docs/specs/fat16_specs.pdf
# https://averstak.tripod.com/fatdox/dir.htm

# ./mkhdmenu.py 16M "C:\=./ICDBOOT.SYS" "C:\GAMES\BUBLGOST=game_zips/Bubble_Ghost_(Klapauzius).zip" "C:\=./disk" hdd16m.img
# or just a config
# ./mkhdmenu.py klapauzius.cfg

# TODO:
# - support variable sector size (bgm)

import sys, os, datetime
from io import BytesIO

from hddimgreader import read_hddimage
from hddimgwriter import write_hddimage
import zipfile
import urllib.request

# up to four partitions are currently supported
DRIVES = [ "C:\\", "D:\\", "E:\\", "F:\\" ]

def usage(msg=None):
    if msg: print("Error:", msg)    
    print("Usage mkhdmenu.py [options] <imagename|size|cfgfile> [commands...] [outname]")
    print("Options:")
    print("  -export-bootloader=<name>   if present export bootloaders from MBR and")
    print("                              bootsectors to <name>_mbr.bin and <name>_bootsector.bin")
    print("  -quiet                      print less output")
    print("<imagename|size>              name of existing hdd image to start with or size description")
    print("                              of the individual partitions like e.g. 16M+16384K for two")
    print("                              partitions of 16 megabytes each")
    print("Commands:")
    print("  dest=src                    copy src into the dest path in the image.")
    print("                              Src can be a zip file, a single regular file or")
    print("                              a entire directory like e.g.")
    print("                              C:\\GAMES\\BUBLGOST=zips/Bubble_Ghost.zip")
    print("")
    print("Bootloaders for AHDI and ICD will be installed in the MBR and the bootsector of")
    print("partition C if a file named SHDRIVER.SYS (AHDI) or ICDBOOT.SYS (ICD) is being")
    print("included in partition C. This also works with hddriver and CBHD if they are being")
    print("(re-)named SHDRIVER.SYS")
    
    sys.exit(0)

def timestr(time):
    return "{:02d}:{:02d}:{:02d}".format((time>>11)&0x1f,(time>>5)&0x3f,2*(time&0x1f))

def datestr(date):
    return "{:02d}.{:02d}.{:04d}".format(date&0x1f,(date>>5)&0x0f,1980+((date>>9)&0x7f))

# ppera uses various names for the main executable
PPERA_PRG = [ "RUNME.TOS", "RUNFALC.TOS", "START.TOS", "START2M.TOS", "START.PRG" ]

######################################################################################
####                                handling files                                ####
######################################################################################

def statistics(partitions):
    def fs_statistics(fs):
        s = { "files":0, "directories":1, "datasize":0 }
        
        for i in fs:
            if "subdir" in i:
                d = fs_statistics(i["subdir"])
                s["files"] += d["files"]
                s["directories"] += d["directories"]
                s["datasize"] += d["datasize"]
            elif "data" in i:
                s["files"] += 1
                s["datasize"] += len(i["data"])

        return s

    print("== Statistics ==")
    
    files = 0
    directories = 0
    datasize = 0
    
    for i in partitions:
        s = fs_statistics(i["files"])
        files += s["files"]
        directories += s["directories"]
        datasize += s["datasize"]

    print("Total number of directories:     ", directories)
    print("Total number of files:           ", files)
    print("Total data bytes:                ", datasize)

def dump_trees(partitions):
    # TODO: determine max depth first and adjust size offset dynamically
    
    def dump_tree(prefix, fs):
        for f in fs:
            if "subdir" in f:
                print(prefix+f["name"]+"\\")
                dump_tree(prefix+"  ", f["subdir"])
            else:
                print(prefix+f["name"], (" "*24)[:-len(f["name"]+prefix)-len(str(len(f["data"])))], len(f["data"]), " ", timestr(f["time"]), " ", datestr(f["date"]))

    for i in range(len(partitions)):
        print("== Files on partition",DRIVES[i],"==")
        dump_tree("", partitions[i]["files"])

def find_file(partitions, name):
    def find_file_int(prefix, fs, name):
        for f in fs:
            if "subdir" in f:
                if find_file_int(prefix+f["name"]+"\\", f["subdir"], name):
                    return True
            else:
                if prefix+f["name"] == name:
                    return True

        return False

    for i in range(len(partitions)):
        if find_file_int("", partitions[i]["files"], name):
            return i

    return None
        
# ========= this is the moment to modify the data =========
# - add files and directories
# - add bootloader
# - redo FAT

def get_file(flist, name):
    for f in flist:
        if f["name"] == name:            
            return f

        if "subdir" in f:
            h = get_file(f["subdir"], name)
            if h: return h
        
    return None
    
def add_file(files, file):
    # process path ...
    for p in file["name"].split("\\")[:-1]:
        d = get_file(files, p)
        if not d:            
            # create directory if it doesn't exist yet
            d = { "name": p, "subdir": [], "time": file["time"], "date": file["date"] }
            files.append(d)

        if not "subdir" in d:
            print("Error, is not a directory", p)
            return False
            
        files = d["subdir"]

    # ... and add the file itself
    file["name"] = file["name"].split("\\")[-1]

    index = None
    # check if the file already exists
    for i in range(len(files)):
        if files[i]["name"] == file["name"]:
            index = i

    if index != None:
        files[index] = file
    else:    
        files.append(file)
    
    return True

def import_zip(drive, partition, src, dst, prg):
    # check if src is a (downloaded) byte array
    name = None
    if isinstance(src, tuple):
        name = src[0]
        src = BytesIO(src[1])
    try:            
        archive = zipfile.ZipFile(src, 'r')
    except Exception as e:
        print(str(e))
        return None

    # make sure destination ends with a "\" as we are
    # importing whole directories
    if dst:
        if not dst[-1] == "\\": dst = dst + "\\"
    else:
        # if no destination path was given, then create a game path automatically
        if prg:
            # prg was explicitely given
            dst = "GAMES\\"+prg+"\\"
        else:
            dst = None
            
            # search for PRG name and use it to create a path
            for filename in archive.namelist():
                for prg_name in PPERA_PRG:
                    if not dst and filename.lower().endswith(prg_name.lower()):
                        dst = "GAMES\\"
                        # check if there's a full path in the name
                        if not "/" in filename:                        
                            dst += name + "\\"

            if not dst:
                for filename in archive.namelist():
                    if not dst and filename.lower().endswith(".prg"):
                        dst = "GAMES\\"+filename.split(".")[0]+"\\"
                    
        # cannot continue without path
        if not dst:
            print("No program path found in ZIP!")
            return None

    for filename in archive.namelist():
        print("Creating", drive+dst+filename.replace("/","\\"))
        with archive.open(filename) as f:
            dt = archive.getinfo(filename).date_time
            ftime = (dt[3] << 11) + (dt[4] << 5) + dt[5]//2
            fdate = dt[2] + (dt[1] << 5) + ((dt[0]-1980)<<9)

            # adjust filename from unix to TOS style
            filename = filename.replace("/","\\")

            # ignore directory entries as they will be created whenever necessary
            if filename[-1] != "\\":            
                file = { "name": dst.upper()+filename.upper(), "data": f.read(), "time": ftime, "date":fdate }
                if not add_file(partition, file):
                    return None

    # if dst consists of "GAMES/" only, then the games path itself is inside the archive and
    # needs to be added for later name matching or csv generation
    if dst == "GAMES\\":
        # find all paths inside archive
        paths = []
        for filename in archive.namelist():
            if "/" in filename:
                if not filename.split("/")[0] in paths:
                    paths.append(filename.split("/")[0])

        # print("PATHS", paths)
        dst += paths[0]
          
    # return the (generated) path as this is later needed to load the NEOPIC screenshot, cut off last "\\"
    if dst[-1] == "\\": dst = dst[:-1]
    
    return drive + dst

def import_directory(drive, partition, src, dst):
    def import_dir(drive, partition, src, dst):
        with os.scandir(src) as entries:
            dst_path = dst.upper()
            if len(dst_path): dst_path += "\\"

            for entry in entries:
                if entry.is_file():
                    import_file(drive, partition, src + "/" + entry.name, dst_path + entry.name.upper())                    

                elif entry.is_dir():
                    import_dir(drive, partition, src+"/"+entry.name, dst_path + entry.name.upper())

    if len(dst) and dst[-1] == "\\": dst = dst[:-1]
    src = os.path.normpath(src)
    
    import_dir(drive, partition, src, dst)
        
    return True
    
def import_file(drive, partition, src, dst):
    try:            
        f = open(src, 'rb')
    except Exception as e:
        print(str(e))
        return False

    # if the target ends with "\" then it's clear that a directory
    # is meant and we just append the source name to make it the full
    # target file name
    if not dst:
        dst = src.split("/")[-1].upper()    
    elif dst[-1] == "\\":
        dst = dst + src.split("/")[-1].upper()
    else:
        # check if destination exists and is a directory
        i = get_file(partition, dst)
        if i and "subdir" in i:
            dst = dst + "\\" + src.split("/")[-1].upper()

    print("Creating", drive + dst)

    dt = datetime.datetime.fromtimestamp(os.stat(src).st_mtime, tz=datetime.timezone.utc)
    ftime = (dt.hour << 11) + (dt.minute << 5) + dt.second//2
    fdate = dt.day + (dt.month << 5) + ((dt.year-1980)<<9)

    file = { "name": dst.upper(), "date": fdate, "time": ftime, "data": f.read() }
    f.close()
    
    return add_file(partition, file)
    
def import_item(partitions, src, dst=None):
    print("Import", src, "to", dst if dst else "<game dir>")

    # if a path was given, then check that it's valid
    if isinstance(dst, str):
        if not dst[:3] in DRIVES:
            print("Error, not a valid partition")
            return False

        if DRIVES.index(dst[:3]) > len(partitions):
            print("Error, partition not present")
            return False

        # select the right partition
        partition = partitions[DRIVES.index(dst[:3])]

        # skip drive letter
        dst = dst[3:]
    elif isinstance(dst, int):
        # just a partition (index)
        partition = partitions[dst]
        dst = None
    else:
        # no drive explicitely given, so use first partition
        partition = partitions[0]
        
    # check if this is a web url
    if src.lower().startswith("http://") or src.lower().startswith("https://"):
        # there may be a ":" in the name which adds the PRG name as there may
        # be multiplex PRGs in the ZIP

        prg = None
        if not src.lower().endswith(".zip") and src.rsplit(":",1)[0].lower().endswith(".zip"):
            src, prg = src.rsplit(":",1)
        
        # only zip files are currently supported
        if not src.lower().endswith(".zip"):
            print("Only ZIP files can be downloaded")
            return False
        
        print("Downloading", src)
        with urllib.request.urlopen(src) as response:
            if response.getcode() != 200:
                print("Download failed with code", response.getcode())
                return False

            # add drive letter to generated path if needed (no dst path was given)
            bname = src.split("/")[-1].split(".")[0]
            return import_zip(partition["drive"], partition["files"], (bname, response.read()), dst, prg)
    
    # check if this is a file url
    if src.lower().startswith("file://"):
        src = src[7:]
    
    # handle the various sources
    if os.path.isfile(src) and src.lower().endswith(".zip"):
        return import_zip(partition["drive"], partition["files"], src, dst, None)
    elif os.path.isdir(src):
        return import_directory(partition["drive"], partition["files"], src, dst)
    elif os.path.isfile(src):
        return import_file(partition["drive"], partition["files"], src, dst)
    else:
        print("Error, don't know how to import", src)
        
    return False

def import_screenshots(partitions, games, data):
    # try to open local screenshot archive
    try:            
        neopics = zipfile.ZipFile("NEOPICS.zip", 'r')
    except Exception as e:
        print("Unable to open NEOPICS.zip", str(e))
        return

    for game in games:
        name = game

        # check if image name needs translation to match file name
        # inside NEOPICS.zip
        if data:
            for src in data:
                if "neopic" in src:
                    if game == src["path"].split("\\")[-1]:
                        name = src["neopic"]
                        
        # try to assemble the screenshot name
        if "/" in name:
            neo = name + "/" + name.split("/")[-1] + ".NEO"
        else:            
            neo = name[0] + "/" + name + "/" + name + ".NEO"        

        # check if file exists
        try:
            f = neopics.open(neo)
        except:
            print("No matching screenshot found for", name)
            f = None

        if f:            
            dt = neopics.getinfo(neo).date_time
            ftime = (dt[3] << 11) + (dt[4] << 5) + dt[5]//2
            fdate = dt[2] + (dt[1] << 5) + ((dt[0]-1980)<<9)

            # try to find the game.prg on any partition
            
            # klapauzius style
            result = find_file(partitions, "GAMES\\"+game+"\\"+game+".PRG")
            # or if that fails ppera style
            for prg_name in PPERA_PRG:            
                if result == None:
                    result = find_file(partitions, "GAMES\\"+game+"\\"+prg_name)
                
            if result != None:
                # result is the partition the file was found in (if it was found)
                file = { "name": "GAMES\\"+game+"\\"+game+".NEO", "data": f.read(), "time": ftime, "date":fdate }
                print("Adding screenshot", partitions[result]["drive"]+file["name"])
                if not add_file(partitions[result]["files"], file):
                    print("Failed to add screenshot!!")
            else:
                print("Unable to identify", game)

            f.close()
            
    neopics.close()
        
def mk_csv(partitions, cfg=None):
    def csv_scan(files, parent):
        gamelist = [ ]
        for f in files:
            if "subdir" in f:
                sublist = csv_scan(f["subdir"], f["name"])
                for entry in sublist:
                    gamelist.append(f["name"]+"\\"+entry)
                
            else:
                # detect games following the klapauzius naming scheme
                if parent and parent == f["name"].split(".")[0] and f["name"].split(".")[-1].lower() == "prg":
                    gamelist.append(f["name"])
                # detect games following the ppera naming scheme
                if parent:
                    for prg_name in PPERA_PRG:
                        if f["name"].split("/")[-1].lower() == prg_name.lower():
                            gamelist.append(f["name"].replace("/", "\\"))
                            return gamelist  # return when first exec found

        return gamelist
    
    # search for games. All programs following the pattern
    # GAME/GAME.PRG are considered being games
    print("Creating game list in C:\\HDMENU.CSV...")
    
    csv = bytearray()
    games = [ ]
    for p in range(len(partitions)):
        plist = csv_scan(partitions[p]["files"], None)
        for i in plist:
            print("Found game", DRIVES[p] + i)

            # check if we have a speaking name entry for this
            speaking_name = None
            if cfg:
                for src in cfg["data"]:
                    if "name" in src:
                        if (DRIVES[p]+i).startswith(src["path"]):
                            speaking_name = src["name"]            

            # no speaking name, but maybe a link?
            if not speaking_name:
                if i.split("\\")[-2] in cfg["links"]:
                    speaking_name = cfg["links"][i.split("\\")[-2]]
                            
            if speaking_name:
                csv = csv + speaking_name.encode("latin-1")
            else:
                csv = csv + i.split("\\")[-2].encode("latin-1")
                
            csv = csv + (";"+DRIVES[p]).encode("latin-1")
            csv = csv + i.encode("latin-1")
            csv = csv + "\r\n".encode("latin-1")

            games.append(i.split("\\")[-2])
    if csv:
        dt = datetime.datetime.now()
        ftime = (dt.hour << 11) + (dt.minute << 5) + dt.second//2
        fdate = dt.day + (dt.month << 5) + ((dt.year-1980)<<9)

        import_screenshots(partitions, games, cfg["data"])
    
        partitions[0]["files"].append( { "name": "HDMENU.CSV", "time":ftime, "date":fdate, "data":csv } )
    else:
        print("Warning, no games found, creating no HDMENU.CSV")
            

# ==========================================================================================        

if len(sys.argv) < 2: usage("No arguments given")    # no arguments at all given ...

# parse all options
options = { "export-bootloader": None, "quiet": False }
arg_idx = 1
while len(sys.argv) > arg_idx and sys.argv[arg_idx][0] == '-':
    # check if option has a "=" in it
    if "=" in sys.argv[arg_idx][1:]:
        name, parm = sys.argv[arg_idx][1:].split("=",1)
    else:
        name = sys.argv[arg_idx][1:]
        parm = None
        
    if not name in options: usage("Unknown option "+sys.argv[arg_idx][1:])

    # options that are not just a boolean take a parameter
    if not isinstance(name, bool):
        if not parm and arg_idx+1 == len(sys.argv):
            usage("Missing option parameter")
        elif parm:
            options[name] = parm
        else:
            options[name] = sys.argv[arg_idx+1]
            arg_idx += 1
    else:
        options[name] = True

    arg_idx += 1

def get_size(p):
    # check all parts for being numbers or numbers+"M" or numbers+"K"
    if not ((p[-1] == 'M' or p[-1] == 'K') and len(p) > 1 and p[:-1].isnumeric()) and not p.isnumeric():
        return None

    if p[-1] == 'M': size = int(p[:-1]) * 1048576
    elif p[-1] == 'K': size = int(p[:-1]) * 1024
    else: size = int(p)

    if size > 16*1024*1024:
        print("Error, partition size must be 16 Megabytes at most")
        return None
        
    if size & 511:
        print("Error, partition size must be a multiple of 512")
        return None
        
    return size

def add_hdmenu_cfg(part):
    print("Creating C:\\HDMENU.CFG")

    data = bytearray(168)

    data[0:4] = bytearray([0,0,0,3])  # version 3
    data[4] = 0  # don't save config at exit
    data[5] = 0  # use system default sync mode
    data[6] = 1  # boot key goes to desktop
    data[7] = 0  # no boot timeout
    data[8] = 0  # keyclick off
    data[9] = 0  # boot key scancode F10
    data[10] = 2 # copyright timeout
    data[11] = 0 # restore boot resolution before launching
    data[12:16] = bytearray([0,0,0,0]) # screensaver off 
    data[16:30] = bytearray([0x20]*14) # no external SNDH file
    data[109] = 2 # auto set columns in text viewer
    data[110] = 1 # text viewer mid rez
    data[111] = 0 # vu meter off
    data[112] = 0 # don't backup csv
    data[113] = 0 # status line off
    data[114] = 0 # music off (1=internal)
    data[115] = 0 # alternative falcon video init
    data[116] = 1 # text viewer white on black
    data[117] = 1 # remember last game
    
    dt = datetime.datetime.now()
    ftime = (dt.hour << 11) + (dt.minute << 5) + dt.second//2
    fdate = dt.day + (dt.month << 5) + ((dt.year-1980)<<9)
    part["files"].append( { "name": "HDMENU.CFG", "time":ftime, "date":fdate, "data":data } )
    
def parse_cfg_file(filename):
    cfg = { "data": [], "links": { } }
    with open(filename) as cfgfile:
        partition_index = 0   # start with one partition
        
        # parse config line by line
        for line in cfgfile:
            line = line.strip()
            
            # any line starting with # is a comment
            if line[0] != '#':
                # first is the command
                cmd = line.split(" ",1)[0]
                if cmd.lower() == "img":
                    # the image consists of the filename and the size
                    img = line.split(" ",1)[1].strip().split(";")
                    cfg["img"] = { "name": img[0].strip(), "size": get_size(img[1].strip()) }
                elif cmd.lower() == "file":
                    # include a file
                    src = line.split(" ",1)[1].strip().split(";")
                    data = { "path": src[0].strip(), "url": src[1].strip() }
                    cfg["data"].append(data)
                elif cmd.lower() == "game":
                    # include a game
                    src = line.split(" ",1)[1].strip().split(";")
                    data = { "url": src[0].strip() }
                    data["partition_index"] = partition_index
                    if len(src) >= 2: data["name"]= src[1].strip()
                    if len(src) >= 3: data["neopic"]= src[2].strip()                        
                    cfg["data"].append(data)                    
                elif cmd.lower() == "link":
                    link = line.split(" ",1)[1].strip().split(";")
                    cfg["links"][link[0].strip()] = link[1].strip()
                elif cmd.lower() == "partition":
                    partition_index += 1
                elif cmd.lower() == "cfg":
                    cfg["hdmenu_cfg"] = True
                elif cmd.lower() == "end":
                    break
                else:
                    print("Unknown command", cmd)
                    return None
                             
        # create empty image of give size
        partitions = []
        for i in range(partition_index+1):
            partitions.append({"size":cfg["img"]["size"]//512, "files": [], "drive": DRIVES[i] })

        # create a hdmenu.cfg if requested
        if "hdmenu_cfg" in cfg and cfg["hdmenu_cfg"]:
            add_hdmenu_cfg(partitions[0])
        
        # import all src items
        for item in cfg["data"]:            
            p = import_item(partitions, item["url"], item["path"] if "path" in item else item["partition_index"])
            if not "path" in item: item["path"] = p

        mk_csv(partitions, cfg)
    
        if not options["quiet"]:
            # dump the fs trees
            dump_trees(partitions)

            # do some fs statistics
            statistics(partitions)

        write_hddimage(cfg["img"]["name"], partitions, options)

# nothing else remaining?
if len(sys.argv) == arg_idx: usage("Missing <imagename|size|cfgfile> argument")

if not options["quiet"]: print("== mkhdmenu.py ==")

# check if only one parameter given and if it's a config file
if len(sys.argv) == arg_idx+1 and sys.argv[arg_idx].lower().endswith(".cfg"):
    print("Building from config file", sys.argv[arg_idx])

    parse_cfg_file(sys.argv[arg_idx])
    sys.exit(0)

image = sys.argv[arg_idx]
arg_idx += 1

# check if image is actually a size description like 16M+16M+8M
parts = image.split("+")

# check all parts for being numbers or numbers+"M" or numbers+"K"
is_size = True
for p in parts:
    if not ((p[-1] == 'M' or p[-1] == 'K') and len(p) > 1 and p[:-1].isnumeric()) and not p.isnumeric():
        is_size = False

# is a valid size desciption -> setup empty partitions scheme
if is_size:
    partitions = []
    for p in parts:
        if p[-1] == 'M': size = int(p[:-1]) * 1048576
        elif p[-1] == 'K': size = int(p[:-1]) * 1024
        else: size = int(p)

        if size > 16*1024*1024:
            print("Error, partition size must be 16 Megabytes at most")
            sys.exit(-1)
        
        if size & 511:
            print("Error, partition size must be a multiple of 512")
            sys.exit(-1)
        
        partitions.append( {"size":size//512, "files": [] }  ) 
else:   
    # read given image into memory
    partitions = read_hddimage(image, options)

if not partitions: sys.exit(-1)

# set drive name for each partition
for p in range(len(partitions)):
    partitions[p]["drive"] = DRIVES[p]

# scan over any further argument until the last one
while arg_idx < len(sys.argv)-1:
    cmd = sys.argv[arg_idx]

    # argument may be like
    if cmd[:3] in DRIVES:
        # convert any \ to / to simplify work        
        dst, src = cmd.split("=",1)        
        dst = dst.replace("/", "\\")

        if not import_item(partitions, src, dst):
            sys.exit(-1)
    else:
        print("Error, unknown command", cmd)
        sys.exit(-1)
        
    arg_idx += 1

mk_csv(partitions)
    
if not options["quiet"]:
    # dump the fs trees
    dump_trees(partitions)

    # do some fs statistics
    statistics(partitions)
    
# write the entire disk image into a file
if arg_idx == len(sys.argv)-1:
    write_hddimage(sys.argv[-1], partitions, options)