import itertools
import os
import os.path
import sys
import json
import subprocess
import optparse
import textwrap

# Explicitly enable local imports
# Don't forget to add imported scripts to inputs of the calling command!
sys.path.append(os.path.dirname(os.path.abspath(__file__)))
import process_command_files as pcf
import thinlto_cache

from process_whole_archive_option import ProcessWholeArchiveOption


def remove_excessive_flags(cmd):
    flags = []
    for flag in cmd:
        if not flag.endswith('.ios.interface') and not flag.endswith('.pkg.fake'):
            flags.append(flag)
    return flags


def remove_libs(cmd, libs):
    excluded_flags = ['-l{}'.format(lib) for lib in libs]

    flags = []

    for flag in cmd:
        if flag in excluded_flags:
            continue

        flags.append(flag)

    return flags


def parse_args(args):
    parser = optparse.OptionParser()
    parser.disable_interspersed_args()
    parser.add_option('--custom-step')
    parser.add_option('--python')
    parser.add_option('--source-root')
    parser.add_option('--build-root')
    parser.add_option('--clang-ver')
    parser.add_option('--dynamic-cuda', action='store_true')
    parser.add_option('--cuda-architectures',
                      help='List of supported CUDA architectures, separated by ":" (e.g. "sm_52:compute_70:lto_90a"')
    parser.add_option('--nvprune-exe')
    parser.add_option('--objcopy-exe')
    parser.add_option('--arch')
    parser.add_option('--linker-output')
    parser.add_option('--whole-archive-peers', action='append')
    parser.add_option('--whole-archive-libs', action='append')
    parser.add_option('--exclude-libs', action='append')
    thinlto_cache.add_options(parser)
    return parser.parse_args(args)


if __name__ == '__main__':
    args = sys.argv[1:]
    plugins = []

    if '--start-plugins' in args:
        ib = args.index('--start-plugins')
        ie = args.index('--end-plugins')
        plugins = args[ib + 1:ie]
        args = args[:ib] + args[ie + 1:]

    for p in plugins:
        res = subprocess.check_output([sys.executable, p, sys.argv[0]] + args).decode().strip()

        if res:
            args = json.loads(res)[1:]

    opts, args = parse_args(args)
    args = pcf.skip_markers(args)

    cmd = args
    cmd = remove_excessive_flags(cmd)

    if opts.exclude_libs:
        cmd = remove_libs(cmd, opts.exclude_libs)

    cmd = ProcessWholeArchiveOption(opts.arch, opts.whole_archive_peers, opts.whole_archive_libs).construct_cmd(cmd)

    if opts.custom_step:
        assert opts.python
        subprocess.check_call([opts.python] + [opts.custom_step] + args)

    if opts.linker_output:
        stdout = open(opts.linker_output, 'w')
    else:
        stdout = sys.stdout

    thinlto_cache.preprocess(opts, cmd)
    rc = subprocess.call(cmd, shell=False, stderr=sys.stderr, stdout=stdout)
    thinlto_cache.postprocess(opts)

    sys.exit(rc)