"""

AppVeyor will at least have few Pythons around so there's no point of implementing a bootstrapper in PowerShell.

This is a port of https://github.com/pypa/python-packaging-user-guide/blob/master/source/code/install.ps1

with various fixes and improvements that just weren't feasible to implement in PowerShell.

"""

from __future__ import print_function

from os import environ

from os.path import exists

from subprocess import check_call

try:

    from urllib.request import urlretrieve

except ImportError:

    from urllib import urlretrieve

BASE_URL = "https://www.python.org/ftp/python/"

GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"

GET_PIP_PATH = "C:\get-pip.py"

URLS = {

    ("2.7", "64"): BASE_URL + "2.7.13/python-2.7.13.amd64.msi",

    ("2.7", "32"): BASE_URL + "2.7.13/python-2.7.13.msi",

    # NOTE: no .msi installer for 3.3.6

    ("3.3", "64"): BASE_URL + "3.3.5/python-3.3.5.amd64.msi",

    ("3.3", "32"): BASE_URL + "3.3.5/python-3.3.5.msi",

    ("3.4", "64"): BASE_URL + "3.4.4/python-3.4.4.amd64.msi",

    ("3.4", "32"): BASE_URL + "3.4.4/python-3.4.4.msi",

    ("3.5", "64"): BASE_URL + "3.5.4/python-3.5.4-amd64.exe",

    ("3.5", "32"): BASE_URL + "3.5.4/python-3.5.4.exe",

    ("3.6", "64"): BASE_URL + "3.6.2/python-3.6.2-amd64.exe",

    ("3.6", "32"): BASE_URL + "3.6.2/python-3.6.2.exe",

}

INSTALL_CMD = {

    # Commands are allowed to fail only if they are not the last command.  Eg: uninstall (/x) allowed to fail.

    "2.7": [["msiexec.exe", "/L*+!", "install.log", "/qn", "/x", "{path}"],

            ["msiexec.exe", "/L*+!", "install.log", "/qn", "/i", "{path}", "TARGETDIR={home}"]],

    "3.3": [["msiexec.exe", "/L*+!", "install.log", "/qn", "/x", "{path}"],

            ["msiexec.exe", "/L*+!", "install.log", "/qn", "/i", "{path}", "TARGETDIR={home}"]],

    "3.4": [["msiexec.exe", "/L*+!", "install.log", "/qn", "/x", "{path}"],

            ["msiexec.exe", "/L*+!", "install.log", "/qn", "/i", "{path}", "TARGETDIR={home}"]],

    "3.5": [["{path}", "/quiet", "TargetDir={home}"]],

    "3.6": [["{path}", "/quiet", "TargetDir={home}"]],

}

def download_file(url, path):

    print("Downloading: {} (into {})".format(url, path))

    progress = [0, 0]

    def report(count, size, total):

        progress[0] = count * size

        if progress[0] - progress[1] > 1000000:

            progress[1] = progress[0]

            print("Downloaded {:,}/{:,} ...".format(progress[1], total))

    dest, _ = urlretrieve(url, path, reporthook=report)

    return dest

def install_python(version, arch, home):

    print("Installing Python", version, "for", arch, "bit architecture to", home)

    if exists(home):

        return

    path = download_python(version, arch)

    print("Installing", path, "to", home)

    success = False

    for cmd in INSTALL_CMD[version]:

        cmd = [part.format(home=home, path=path) for part in cmd]

        print("Running:", " ".join(cmd))

        try:

            check_call(cmd)

        except Exception as exc:

            print("Failed command", cmd, "with:", exc)

            if exists("install.log"):

                with open("install.log") as fh:

                    print(fh.read())

        else:

            success = True

    if success:

        print("Installation complete!")

    else:

        print("Installation failed")

def download_python(version, arch):

    for _ in range(3):

        try:

            return download_file(URLS[version, arch], "installer.exe")

        except Exception as exc:

            print("Failed to download:", exc)

        print("Retrying ...")

def install_pip(home):

    pip_path = home + "/Scripts/pip.exe"

    python_path = home + "/python.exe"

    if exists(pip_path):

        print("pip already installed.")

    else:

        print("Installing pip...")

        download_file(GET_PIP_URL, GET_PIP_PATH)

        print("Executing:", python_path, GET_PIP_PATH)

        check_call([python_path, GET_PIP_PATH])

def install_packages(home, *packages):

    cmd = [home + "/Scripts/pip.exe", "install"]

    cmd.extend(packages)

    check_call(cmd)

if __name__ == "__main__":

    install_python(environ['PYTHON_VERSION'], environ['PYTHON_ARCH'], environ['PYTHON_HOME'])

    install_pip(environ['PYTHON_HOME'])

    install_packages(environ['PYTHON_HOME'], "setuptools>=18.0.1", "wheel", "tox", "virtualenv>=13.1.0")