import argparse
import re
import sys
import shutil
import os
import tempfile

from pathlib import Path
from zipfile import ZipFile, ZIP_DEFLATED
import subprocess

TKTCL_RE = re.compile(r'^(_?tk|tcl).+\.(pyd|dll)', re.IGNORECASE)
DEBUG_RE = re.compile(r'_d\.(pyd|dll|exe)$', re.IGNORECASE)
PYTHON_DLL_RE = re.compile(r'python\d\d?\.dll$', re.IGNORECASE)

def is_not_debug(p):
    if DEBUG_RE.search(p.name):
        return False

    if TKTCL_RE.search(p.name):
        return False

    return p.name.lower() not in {
        '_ctypes_test.pyd',
        '_testbuffer.pyd',
        '_testcapi.pyd',
        '_testimportmultiple.pyd',
        '_testmultiphase.pyd',
        'xxlimited.pyd',
    }

def is_not_debug_or_python(p):
    return is_not_debug(p) and not PYTHON_DLL_RE.search(p.name)

def include_in_lib(p):
    name = p.name.lower()
    if p.is_dir():
        if name in {'__pycache__', 'ensurepip', 'idlelib', 'pydoc_data', 'tkinter', 'turtledemo'}:
            return False
        if name.startswith('plat-'):
            return False
        if name == 'test' and p.parts[-2].lower() == 'lib':
            return False
        return True

    suffix = p.suffix.lower()
    return suffix not in {'.pyc', '.pyo'}

def include_in_tools(p):
    if p.is_dir() and p.name.lower() in {'scripts', 'i18n', 'pynche', 'demo', 'parser'}:
        return True

    return p.suffix.lower() in {'.py', '.pyw', '.txt'}

FULL_LAYOUT = [
    ('/', 'PCBuild/$arch', 'python*.exe', is_not_debug),
    ('/', 'PCBuild/$arch', 'python*.dll', is_not_debug),
    ('DLLs/', 'PCBuild/$arch', '*.pyd', is_not_debug),
    ('DLLs/', 'PCBuild/$arch', '*.dll', is_not_debug),
    ('include/', 'include', '*.h', None),
    ('include/', 'PC', 'pyconfig.h', None),
    ('Lib/', 'Lib', '**/*', include_in_lib),
    ('Tools/', 'Tools', '**/*', include_in_tools),
]

if os.getenv('DOC_FILENAME'):
    FULL_LAYOUT.append(('Doc/', 'Doc/build/htmlhelp', os.getenv('DOC_FILENAME'), None))

EMBED_LAYOUT = [
    ('/', 'PCBuild/$arch', 'python*.exe', is_not_debug),
    ('/', 'PCBuild/$arch', '*.pyd', is_not_debug),
    ('/', 'PCBuild/$arch', '*.dll', is_not_debug),
    ('python35.zip', 'Lib', '**/*', include_in_lib),
]

def copy_to_layout(target, rel_sources):
    count = 0

    if target.suffix.lower() == '.zip':
        if target.exists():
            target.unlink()

        with ZipFile(str(target), 'w', ZIP_DEFLATED) as f:
            for s, rel in rel_sources:
                f.write(str(s), str(rel))
                count += 1

    else:
        for s, rel in rel_sources:
            try:
                (target / rel).parent.mkdir(parents=True)
            except FileExistsError:
                pass
            shutil.copy(str(s), str(target / rel))
            count += 1

    return count

def rglob(root, pattern, condition):
    dirs = [root]
    recurse = pattern[:3] in {'**/', '**\\'}
    while dirs:
        d = dirs.pop(0)
        for f in d.glob(pattern[3:] if recurse else pattern):
            if recurse and f.is_dir() and (not condition or condition(f)):
                dirs.append(f)
            elif f.is_file() and (not condition or condition(f)):
                yield f, f.relative_to(root)

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-s', '--source', metavar='dir', help='The directory containing the repository root', type=Path)
    parser.add_argument('-o', '--out', metavar='file', help='The name of the output self-extracting archive', type=Path, required=True)
    parser.add_argument('-t', '--temp', metavar='dir', help='A directory to temporarily extract files into', type=Path, default=None)
    parser.add_argument('-e', '--embed', help='Create an embedding layout', action='store_true', default=False)
    parser.add_argument('-a', '--arch', help='Specify the architecture to use (win32/amd64)', type=str, default="win32")
    ns = parser.parse_args()

    source = ns.source or (Path(__file__).parent.parent.parent)
    out = ns.out
    arch = ns.arch
    assert isinstance(source, Path)
    assert isinstance(out, Path)
    assert isinstance(arch, str)

    if ns.temp:
        temp = ns.temp
        delete_temp = False
    else:
        temp = Path(tempfile.mkdtemp())
        delete_temp = True

    try:
        out.parent.mkdir(parents=True)
    except FileExistsError:
        pass
    try:
        temp.mkdir(parents=True)
    except FileExistsError:
        pass

    layout = EMBED_LAYOUT if ns.embed else FULL_LAYOUT

    try:
        for t, s, p, c in layout:
            s = source / s.replace("$arch", arch)
            copied = copy_to_layout(temp / t.rstrip('/'), rglob(s, p, c))
            print('Copied {} files'.format(copied))

        with open(str(temp / 'pyvenv.cfg'), 'w') as f:
            print('applocal = true', file=f)

        total = copy_to_layout(out, rglob(temp, '*', None))
        print('Wrote {} files to {}'.format(total, out))
    finally:
        if delete_temp:
            shutil.rmtree(temp, True)


if __name__ == "__main__":
    sys.exit(int(main() or 0))