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from _common import iterpair, listid, pathid, rootrel_arc_src, tobuilddir, filter_out_by_keyword


def split(lst, limit):
    # paths are specified with replaceable prefix
    # real length is unknown at the moment, that why we use root_lenght
    # as a rough estimation
    root_lenght = 200
    filepath = None
    lenght = 0
    bucket = []

    for item in lst:
        if filepath:
            lenght += root_lenght + len(filepath) + len(item)
            if lenght > limit and bucket:
                yield bucket
                bucket = []
                lenght = 0

            bucket.append(filepath)
            bucket.append(item)
            filepath = None
        else:
            filepath = item

    if bucket:
        yield bucket


def remove_prefix(text, prefix):
    if text.startswith(prefix):
        return text[len(prefix):]
    return text


def onfat_resource(unit, *args):
    unit.onpeerdir(['library/cpp/resource'])

    # Since the maximum length of lpCommandLine string for CreateProcess is 8kb (windows) characters,
    # we make several calls of rescompiler
    # https://msdn.microsoft.com/ru-ru/library/windows/desktop/ms682425.aspx
    for part_args in split(args, 8000):
        output = listid(part_args) + '.cpp'
        inputs = [x for x, y in iterpair(part_args) if x != '-'] 
        if inputs: 
            inputs = ['IN'] + inputs 

        unit.onrun_program(['tools/rescompiler', output] + part_args + inputs + ['OUT_NOAUTO', output]) 
        unit.onsrcs(['GLOBAL', output])


def onresource_files(unit, *args): 
    """ 
    @usage: RESOURCE_FILES([DONT_PARSE] [PREFIX {prefix}] [STRIP prefix_to_strip] {path})

    This macro expands into
    RESOURCE([DONT_PARSE] {path} resfs/file/{prefix}{path}
        - resfs/src/resfs/file/{prefix}{remove_prefix(path, prefix_to_strip)}={rootrel_arc_src(path)}
    ) 
 
    resfs/src/{key} stores a source root (or build root) relative path of the 
    source of the value of the {key} resource. 
 
    resfs/file/{key} stores any value whose source was a file on a filesystem. 
    resfs/src/resfs/file/{key} must store its path. 
 
    DONT_PARSE disables parsing for source code files (determined by extension)
               Please don't abuse: use separate DONT_PARSE macro call only for files subject to parsing

    This form is for use from other plugins: 
    RESOURCE_FILES([DEST {dest}] {path}) expands into RESOURCE({path} resfs/file/{dest}) 

    @see: https://wiki.yandex-team.ru/devtools/commandsandvars/resourcefiles/
    """ 
    prefix = '' 
    prefix_to_strip = None
    dest = None 
    res = [] 
    first = 0

    if args and not unit.enabled('_GO_MODULE'):
        # GO_RESOURCE currently doesn't support DONT_PARSE
        res.append('DONT_PARSE')

    if args and args[0] == 'DONT_PARSE':
        first = 1
 
    args = iter(args[first:])
    for arg in args: 
        if arg == 'PREFIX': 
            prefix, dest = next(args), None 
        elif arg == 'DEST': 
            dest, prefix = next(args), None 
        elif arg == 'STRIP':
            prefix_to_strip = next(args)
        else: 
            path = arg 
            key = 'resfs/file/' + (dest or (prefix + (path if not prefix_to_strip else remove_prefix(path, prefix_to_strip))))
            src = 'resfs/src/{}={}'.format(key, rootrel_arc_src(path, unit)) 
            res += ['-', src, path, key] 
 
    if unit.enabled('_GO_MODULE'):
        unit.on_go_resource(res)
    else:
        unit.onresource(res)