#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""The setup script."""

from collections import namedtuple
from distutils.dir_util import copy_tree, mkpath
import glob
from html.parser import HTMLParser
import json
import os
import pkg_resources
from pprint import pformat
from setuptools import setup, find_packages  # type: ignore
from setuptools.command.develop import develop  # type: ignore
from setuptools.command.install import install  # type: ignore
from setuptools.command.bdist_egg import bdist_egg  # type: ignore
import shutil
import subprocess
import sys
import tarfile
import typing as T
from urllib.error import HTTPError, URLError
from urllib.request import urlopen
from wheel.bdist_wheel import bdist_wheel  # type: ignore
import zipfile


GECKO_RELEASE_PATH = "https://github.com/mozilla/geckodriver"
PKG_NAME = "bot_z"
VERSION = "1.1.3"
AUTHOR = "blallo"
AUTHOR_EMAIL = "blallo@autistici.org"
BIN_PATH = "bin/geckodriver"
ASSET_FILE_PATHS = [
    "assets/*",
    "assets/static/*",
    "assets/static/css/*",
    "assets/static/js/*",
]

with open("README.md") as readme_file:
    readme = readme_file.read()

requirements = [
    "Click>=7.0",
    "selenium>=3.141.0",
    "lockfile>=0.12.2",
    "python-daemon>=2.2.3",
    "aiohttp>=3.5.4",
    "aiodns>=2.0.0",
    "cchardet",
    "aiohttp-session==2.7.0",
    "cryptography==2.7",
    "PyYAML==5.1.2",
    "passlib>=1.7.1, <2.0.0",
    "bcrypt>=3.0.0",
]

setup_requirements = []  # type: T.List[str]

test_requirements = []  # type: T.List[str]


def _find_javascript_pkgmgr():
    pkgmgr_list = ("yarn", "npm")
    for _pkgmgr in pkgmgr_list:
        if shutil.which(_pkgmgr):
            pkgmgr = _pkgmgr
            break

    if not pkgmgr:
        raise RuntimeError(
            "Missing javascript package manager. Allowed are: {}".format(pkgmgr_list)
        )

    return pkgmgr


def _find_built_assets(base_path: str):
    asset_manifest = os.path.join(base_path, "build", "asset-manifest.json")
    with open(asset_manifest) as f:
        manifest = json.load(f)
    return manifest.get("files")


def build_web():
    pkgmgr = _find_javascript_pkgmgr()
    webpath = "./bot.z_web"  # TODO: find base path
    script = f"cd {webpath} && {pkgmgr} build"
    print("[BUILD_WEB] running script:\n\t{}".format(script))
    subprocess.check_call(["bash", "-c", script])
    assets = _find_built_assets(webpath)
    print("[BUILD_WEB] built assets: {}".format(pformat(assets)))
    assets_path = pkg_resources.resource_filename("api", "assets")
    if not os.path.exists(assets_path):
        mkpath(assets_path)
    copy_tree(os.path.join(webpath, "build"), assets_path)


class GitTags(HTMLParser):
    tags: T.List[str] = list()
    take_next = 0

    def handle_starttag(self, tag, attrs):
        dattrs = dict(attrs)
        if "commit-title" in dattrs.get("class", ""):
            self.take_next = 1

    def handle_data(self, data):
        if self.take_next == 0:
            return
        elif self.take_next == 1:
            self.take_next = 2
        elif self.take_next == 2:
            self.tags.append(data.strip("\n").strip(" ").strip("\n"))
            self.take_next = 0


def retrieve_page(url: str) -> bytes:
    """
    Auxiliary function to download html body
    from and URI, handling the errors.
    """
    try:
        with urlopen(url) as conn:
            content = conn.read()
    except HTTPError as e:
        print("Connection error: {!s}".format(e))
        raise
    except URLError as e:
        print("Check the URI: {!s}".format(e))
        raise

    return content


def find_latest_version(url: str) -> str:
    """
    Retrieves latest geckodriver tag.
    """
    tag_page = retrieve_page("{}/tags".format(url))
    gt = GitTags()
    gt.feed(tag_page.decode("utf-8"))
    gt.tags.sort()
    return gt.tags[-1]


def verify_if_superuser() -> bool:
    """
    Checks if uid or euid is 0.
    """
    _uid = os.getuid()
    _euid = os.geteuid()
    return _uid == 0 or _euid == 0


def ensure_local_folder() -> None:
    """
    Create a bin/ folder in the current package installation path.
    """
    bin_path = pkg_resources.resource_filename(PKG_NAME, BIN_PATH)
    print("[LOCAL_FOLDER] ensuring local folder: {}".format(bin_path))
    pkg_resources.ensure_directory(bin_path)


PLATFORM_MAP = {
    "win32": "win32",
    "win64": "win64",
    "linux32": "linux32",
    "linux64": "linux64",
    "darwin64": "macos",
    "darwin32": "macos",  # This is impossible (?)
    "macos": "macos",
}


def _identify_platform():
    s_platform = sys.platform
    if s_platform == "darwin":
        return "macos"
    is_64bits = sys.maxsize > 2 ** 32
    if "linux" in s_platform:
        plat = "linux"
    elif "win" in s_platform:
        plat = "win"
    if is_64bits:
        platform = "{}64".format(plat)
    else:
        platform = "{}32".format(plat)
    return platform


def assemble_driver_uri(
    version: T.Optional[str] = None, platform: T.Optional[str] = None
) -> str:
    """
    Selects the right geckodriver URI.
    """
    # TODO: use pkg_resources.get_platform()
    if not version:
        version = find_latest_version(GECKO_RELEASE_PATH)
    if platform is None:
        platform = _identify_platform()
    if "win" in platform:
        ext = "zip"
    else:
        ext = "tar.gz"
    return "{base}/releases/download/{vers}/geckodriver-{vers}-{platform}.{ext}".format(
        base=GECKO_RELEASE_PATH, vers=version, platform=PLATFORM_MAP[platform], ext=ext
    )


def download_driver_bin(uri: str, path: str) -> None:
    """
    Donwloads the geckodriver binary.
    """
    name = uri.split("/")[-1]
    filepath = os.path.join(path, name)
    print("[DRIVER] downloading '{}' to {}".format(uri, filepath))
    content = retrieve_page(uri)
    try:
        with open(filepath, "wb") as f:
            f.write(content)
        if name.endswith(".zip"):
            with zipfile.ZipFile(filepath, "r") as z:
                z.extractall(path)
        elif name.endswith(".tar.gz"):
            with tarfile.open(filepath, "r") as r:
                r.extractall(path)
        else:
            raise RuntimeError("Unrecognized file extension: %s", name)
    finally:
        os.remove(filepath)


def preinstall(platform: T.Text, build_iface: bool = True) -> None:
    """
    Performs all the postintallation flow, donwloading in the
    right place the geckodriver binary.
    """
    target_path = pkg_resources.resource_filename(
        "bot_z", os.path.join("bin", platform)
    )
    if not os.path.exists(target_path):
        mkpath(target_path)
    ensure_local_folder()
    version = os.environ.get("BOTZ_GECKO_VERSION")
    gecko_uri = assemble_driver_uri(version, platform)
    print("[POSTINSTALL] gecko_uri: {}".format(gecko_uri))
    download_driver_bin(gecko_uri, target_path)
    if build_iface:
        build_web()


PLATS = {
    "win32": "win32",
    "win-amd64": "win64",
    "manylinux1-i686": "linux32",
    "manylinux1-x86_64": "linux64",
    "macosx": "macos",
}


def translate_platform_to_gecko_vers(plat: str) -> str:
    """
    Map appropriately the platform provided on the command line
    to the one used by PEP 513.
    """
    if plat is None:
        return None

    try:
        return PLATS[plat]
    except KeyError:
        print("Allowed platforms are: {!r}".format(list(PLATS.keys())))
        raise


# From: https://stackoverflow.com/a/36902139
class CustomDevelopCommand(develop):
    """Custom installation for development mode."""

    def run(self):
        print("POSTINSTALL")
        platform = _identify_platform()
        preinstall(platform, build_iface=False)
        super().run()


class CustomInstallCommand(install):
    """Custom installation for installation mode."""

    def run(self):
        opts = self.distribution.get_cmdline_options()
        platform = None
        if "bdist_wheel" in opts:
            platform = translate_platform_to_gecko_vers(
                opts["bdist_wheel"].get("plat-name")
            )
        preinstall(platform)
        super().run()


# From: https://stackoverflow.com/a/45150383
class CustomBDistWheel(bdist_wheel):
    """
    Custom bdist_wheel command to ship the right binary
    of geckodriver.
    """

    def finalize_options(self):
        super().finalize_options()
        self.root_is_pure = False

    def get_tag(self):
        python, abi, plat = super().get_tag()
        python, abi = "py3", "none"
        return python, abi, plat


setup(
    name=PKG_NAME,
    version=VERSION,
    description="A bot to easen the daily routine with zucchetti virtual badge.",
    long_description=readme,
    author=AUTHOR,
    author_email=AUTHOR_EMAIL,
    url="https://git.abbiamoundominio.org/blallo/BotZ",
    packages=find_packages(include=["bot_z", "api"]),
    cmdclass={
        "develop": CustomDevelopCommand,
        "install": CustomInstallCommand,
        "bdist_wheel": CustomBDistWheel,
    },
    entry_points={"console_scripts": ["bot_z=bot_z.cli:cli", "z_app=api.app:cli"]},
    package_data={"bot_z": ["bin/geckodriver"], "api": ASSET_FILE_PATHS},
    install_requires=requirements,
    license="GLWTS Public Licence",
    zip_safe=False,
    keywords="bot_z",
    classifiers=[
        "Development Status :: 2 - Pre-Alpha",
        "Intended Audience :: Developers",
        "License :: GLWTS Public Licence",
        "Natural Language :: English",
        "Programming Language :: Python :: 3",
        "Programming Language :: Python :: 3.7",
    ],
    test_suite="pytest",
    tests_require=test_requirements,
    setup_requires=setup_requirements,
)