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


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 == 'DONT_PARSE':
            # ignore explicit specification
            continue
        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)

def onall_resource_files(unit, *args):
    # This is only validation, actual work is done in ymake.core.conf implementation
    for arg in args:
        if '*' in arg or '?' in arg:            
            ymake.report_configure_error('Wildcards in [[imp]]ALL_RESOURCE_FILES[[rst]] are not allowed')