#!/usr/bin/env python3

import contextlib
import fnmatch
import os
import platform
import runpy
import shlex
import shutil
import subprocess
import sys
import tarfile
import zipfile
from os.path import join, abspath, normpath, dirname, exists, basename

import click
import pysftp

# https://virtualenv.pypa.io/en/latest/userguide.html#windows-notes
# scripts and executables on Windows go in ENV\Scripts\ instead of ENV/bin/
if platform.system() == "Windows":
    VENV_BIN = "Scripts"
else:
    VENV_BIN = "bin"

# ZipFile and tarfile have slightly different APIs. Fix that.
if platform.system() == "Windows":
    def Archive(name):
        a = zipfile.ZipFile(name, "w")
        a.add = a.write
        return a
else:
    def Archive(name):
        return tarfile.open(name, "w:gz")

ROOT_DIR = abspath(join(dirname(__file__), ".."))
RELEASE_DIR = join(ROOT_DIR, "release")

BUILD_DIR = join(RELEASE_DIR, "build")
DIST_DIR = join(RELEASE_DIR, "dist")

PYINSTALLER_SPEC = join(RELEASE_DIR, "specs")
PYINSTALLER_TEMP = join(BUILD_DIR, "pyinstaller")
PYINSTALLER_DIST = join(BUILD_DIR, "binaries")

VENV_DIR = join(BUILD_DIR, "venv")
VENV_PIP = join(VENV_DIR, VENV_BIN, "pip")
VENV_PYINSTALLER = join(VENV_DIR, VENV_BIN, "pyinstaller")

# Project Configuration
VERSION_FILE = join(ROOT_DIR, "netlib", "version.py")
PROJECT_NAME = "mitmproxy"
PYTHON_VERSION = "py2.py3"
BDISTS = {
    "mitmproxy": ["mitmproxy", "mitmdump", "mitmweb"],
    "pathod": ["pathoc", "pathod"]
}
if platform.system() == "Windows":
    BDISTS["mitmproxy"].remove("mitmproxy")

TOOLS = [
    tool
    for tools in BDISTS.values()
    for tool in tools
]


def get_version() -> str:
    return runpy.run_path(VERSION_FILE)["VERSION"]


def git(args: str) -> str:
    with chdir(ROOT_DIR):
        return subprocess.check_output(["git"] + shlex.split(args)).decode()


def get_snapshot_version() -> str:
    last_tag, tag_dist, commit = git("describe --tags --long").strip().rsplit("-", 2)
    tag_dist = int(tag_dist)
    if tag_dist == 0:
        return get_version()
    else:
        # The wheel build tag (we use the commit) must start with a digit, so we include "0x"
        return "{version}dev{tag_dist:04}-0x{commit}".format(
            version=get_version(),  # this should already be the next version
            tag_dist=tag_dist,
            commit=commit
        )


def archive_name(bdist: str) -> str:
    platform_tag = {
        "Darwin": "osx",
        "Windows": "win32",
        "Linux": "linux"
    }.get(platform.system(), platform.system())
    if platform.system() == "Windows":
        ext = "zip"
    else:
        ext = "tar.gz"
    return "{project}-{version}-{platform}.{ext}".format(
        project=bdist,
        version=get_version(),
        platform=platform_tag,
        ext=ext
    )


def wheel_name() -> str:
    return "{project}-{version}-{py_version}-none-any.whl".format(
        project=PROJECT_NAME,
        version=get_version(),
        py_version=PYTHON_VERSION
    )


@contextlib.contextmanager
def empty_pythonpath():
    """
    Make sure that the regular python installation is not on the python path,
    which would give us access to modules installed outside of our virtualenv.
    """
    pythonpath = os.environ.get("PYTHONPATH", "")
    os.environ["PYTHONPATH"] = ""
    yield
    os.environ["PYTHONPATH"] = pythonpath


@contextlib.contextmanager
def chdir(path: str):
    old_dir = os.getcwd()
    os.chdir(path)
    yield
    os.chdir(old_dir)


@click.group(chain=True)
def cli():
    """
    mitmproxy build tool
    """
    pass


@cli.command("contributors")
def contributors():
    """
    Update CONTRIBUTORS.md
    """
    with chdir(ROOT_DIR):
        print("Updating CONTRIBUTORS...")
        contributors_data = git("shortlog -n -s")
        with open("CONTRIBUTORS", "wb") as f:
            f.write(contributors_data.encode())


@cli.command("wheel")
def make_wheel():
    """
    Build wheel
    """
    with empty_pythonpath():
        if exists(DIST_DIR):
            shutil.rmtree(DIST_DIR)

        print("Creating wheel...")
        subprocess.check_call(
            [
                "python", "./setup.py", "-q",
                "bdist_wheel", "--dist-dir", DIST_DIR, "--universal"
            ],
            cwd=ROOT_DIR
        )

        print("Creating virtualenv for test install...")
        if exists(VENV_DIR):
            shutil.rmtree(VENV_DIR)
        subprocess.check_call(["virtualenv", "-q", VENV_DIR])

        with chdir(DIST_DIR):
            print("Install wheel into virtualenv...")
            # lxml...
            if platform.system() == "Windows" and sys.version_info[0] == 3:
                subprocess.check_call(
                    [VENV_PIP, "install", "-q", "https://snapshots.mitmproxy.org/misc/lxml-3.6.0-cp35-cp35m-win32.whl"]
                )
            subprocess.check_call([VENV_PIP, "install", "-q", wheel_name()])

            print("Running tools...")
            for tool in TOOLS:
                tool = join(VENV_DIR, VENV_BIN, tool)
                print("> %s --version" % tool)
                print(subprocess.check_output([tool, "--version"]).decode())

            print("Virtualenv available for further testing:")
            print("source %s" % normpath(join(VENV_DIR, VENV_BIN, "activate")))


@cli.command("bdist")
@click.option("--use-existing-wheel/--no-use-existing-wheel", default=False)
@click.argument("pyinstaller_version", envvar="PYINSTALLER_VERSION", default="PyInstaller~=3.1.1")
@click.argument("setuptools_version", envvar="SETUPTOOLS_VERSION", default="setuptools>=25.1.0,!=25.1.1")
@click.pass_context
def make_bdist(ctx, use_existing_wheel, pyinstaller_version, setuptools_version):
    """
    Build a binary distribution
    """
    if exists(PYINSTALLER_TEMP):
        shutil.rmtree(PYINSTALLER_TEMP)
    if exists(PYINSTALLER_DIST):
        shutil.rmtree(PYINSTALLER_DIST)

    if not use_existing_wheel:
        ctx.invoke(make_wheel)

    print("Installing PyInstaller and setuptools...")
    subprocess.check_call([VENV_PIP, "install", "-q", pyinstaller_version, setuptools_version])
    print(subprocess.check_output([VENV_PIP, "freeze"]).decode())

    for bdist, tools in BDISTS.items():
        with Archive(join(DIST_DIR, archive_name(bdist))) as archive:
            for tool in tools:
                # This is PyInstaller, so it messes up paths.
                # We need to make sure that we are in the spec folder.
                with chdir(PYINSTALLER_SPEC):
                    print("Building %s binary..." % tool)
                    subprocess.check_call(
                        [
                            VENV_PYINSTALLER,
                            "--clean",
                            "--workpath", PYINSTALLER_TEMP,
                            "--distpath", PYINSTALLER_DIST,
                            # This is PyInstaller, so setting a
                            # different log level obviously breaks it :-)
                            # "--log-level", "WARN",
                            "%s.spec" % tool
                        ]
                    )

                # Test if it works at all O:-)
                executable = join(PYINSTALLER_DIST, tool)
                if platform.system() == "Windows":
                    executable += ".exe"
                print("> %s --version" % executable)
                print(subprocess.check_output([executable, "--version"]).decode())

                archive.add(executable, basename(executable))
        print("Packed {}.".format(archive_name(bdist)))


@cli.command("upload-release")
@click.option('--username', prompt=True)
@click.password_option(confirmation_prompt=False)
@click.option('--repository', default="pypi")
def upload_release(username, password, repository):
    """
    Upload wheels to PyPI
    """
    filename = wheel_name()
    print("Uploading {} to {}...".format(filename, repository))
    subprocess.check_call([
        "twine",
        "upload",
        "-u", username,
        "-p", password,
        "-r", repository,
        join(DIST_DIR, filename)
    ])


@cli.command("upload-snapshot")
@click.option("--host", envvar="SNAPSHOT_HOST", prompt=True)
@click.option("--port", envvar="SNAPSHOT_PORT", type=int, default=22)
@click.option("--user", envvar="SNAPSHOT_USER", prompt=True)
@click.option("--private-key", default=join(RELEASE_DIR, "rtool.pem"))
@click.option("--private-key-password", envvar="SNAPSHOT_PASS", prompt=True, hide_input=True)
@click.option("--wheel/--no-wheel", default=False)
@click.option("--bdist/--no-bdist", default=False)
def upload_snapshot(host, port, user, private_key, private_key_password, wheel, bdist):
    """
    Upload snapshot to snapshot server
    """
    with pysftp.Connection(host=host,
                           port=port,
                           username=user,
                           private_key=private_key,
                           private_key_pass=private_key_password) as sftp:
        dir_name = "snapshots/v{}".format(get_version())
        sftp.makedirs(dir_name)
        with sftp.cd(dir_name):
            files = []
            if wheel:
                files.append(wheel_name())
            if bdist:
                for bdist in BDISTS.keys():
                    files.append(archive_name(bdist))

            for f in files:
                local_path = join(DIST_DIR, f)
                remote_filename = f.replace(get_version(), get_snapshot_version())
                symlink_path = "../{}".format(f.replace(get_version(), "latest"))

                # Upload new version
                print("Uploading {} as {}...".format(f, remote_filename))
                with click.progressbar(length=os.stat(local_path).st_size) as bar:
                    # We hide the file during upload
                    sftp.put(
                        local_path,
                        "." + remote_filename,
                        callback=lambda done, total: bar.update(done - bar.pos)
                    )

                # Delete old versions
                old_version = f.replace(get_version(), "*")
                for f_old in sftp.listdir():
                    if fnmatch.fnmatch(f_old, old_version):
                        print("Removing {}...".format(f_old))
                        sftp.remove(f_old)

                # Show new version
                sftp.rename("." + remote_filename, remote_filename)

                # update symlink for the latest release
                if sftp.lexists(symlink_path):
                    print("Removing {}...".format(symlink_path))
                    sftp.remove(symlink_path)
                if f != wheel_name():
                    # "latest" isn't a proper wheel version, so this could not be installed.
                    # https://github.com/mitmproxy/mitmproxy/issues/1065
                    sftp.symlink("v{}/{}".format(get_version(), remote_filename), symlink_path)


if __name__ == "__main__":
    cli()