#!/usr/bin/env python
from __future__ import absolute_import, print_function, division
from os.path import join
import contextlib
import os
import shutil
import subprocess
import re
import shlex
import runpy
import zipfile
import tarfile
import platform
import click
import pysftp
import fnmatch
from six.moves import shlex_quote

# 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"

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")

RELEASE_DIR = join(os.path.dirname(os.path.realpath(__file__)))
DIST_DIR = join(RELEASE_DIR, "dist")
ROOT_DIR = join(RELEASE_DIR, "..")

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

ALL_PROJECTS = {
    "netlib": {
        "tools": [],
        "vfile": join(ROOT_DIR, "netlib/netlib/version.py"),
        "dir": join(ROOT_DIR, "netlib"),
        "python_version": "py2.py3"  # this is the format in wheel filenames
    },
    "pathod": {
        "tools": ["pathod", "pathoc"],
        "vfile": join(ROOT_DIR, "pathod/libpathod/version.py"),
        "dir": join(ROOT_DIR, "pathod"),
        "python_version": "py2"
    },
    "mitmproxy": {
        "tools": ["mitmproxy", "mitmdump", "mitmweb"],
        "vfile": join(ROOT_DIR, "mitmproxy/libmproxy/version.py"),
        "dir": join(ROOT_DIR, "mitmproxy"),
        "python_version": "py2"
    }
}
if platform.system() == "Windows":
    ALL_PROJECTS["mitmproxy"]["tools"].remove("mitmproxy")

projects = {}


def get_version(project):
    return runpy.run_path(projects[project]["vfile"])["VERSION"]


def get_snapshot_version(project):
    last_tag, tag_dist, commit = subprocess.check_output(
        ["git", "describe", "--tags", "--long"],
        cwd=projects[project]["dir"]
    ).strip().rsplit("-", 2)
    tag_dist = int(tag_dist)
    if tag_dist == 0:
        return get_version(project)
    else:
        return "{version}dev{tag_dist:04}-{commit}".format(
            version=get_version(project),  # this should already be the next version
            tag_dist=tag_dist,
            commit=commit
        )


def archive_name(project):
    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=project,
        version=get_version(project),
        platform=platform_tag,
        ext=ext
    )


def sdist_name(project):
    return "{project}-{version}.tar.gz".format(
        project=project,
        version=get_version(project)
    )


def wheel_name(project):
    return "{project}-{version}-{py_version}-none-any.whl".format(
        project=project,
        version=get_version(project),
        py_version=projects[project]["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):
    old_dir = os.getcwd()
    os.chdir(path)
    yield
    os.chdir(old_dir)


@click.group(chain=True)
@click.option(
    '--project', '-p',
    multiple=True, type=click.Choice(ALL_PROJECTS.keys()), default=ALL_PROJECTS.keys()
)
def cli(project):
    """
    mitmproxy build tool
    """
    for name in project:
        projects[name] = ALL_PROJECTS[name]


@cli.command("contributors")
def contributors():
    """
    Update CONTRIBUTORS.md
    """
    for project, conf in projects.items():
        with chdir(conf["dir"]):
            print("Updating %s/CONTRIBUTORS..." % project)
            contributors_data = subprocess.check_output(
                shlex.split("git shortlog -n -s")
            )
            with open("CONTRIBUTORS", "w") as f:
                f.write(contributors_data)


@cli.command("set-version")
@click.argument('version')
def set_version(version):
    """
    Update version information
    """
    print("Update versions...")
    version = ", ".join(version.split("."))
    for p, conf in projects.items():
        print("Update %s..." % os.path.normpath(conf["vfile"]))
        with open(conf["vfile"], "rb") as f:
            content = f.read()
        new_content = re.sub(
            r"IVERSION\s*=\s*\([\d,\s]+\)", "IVERSION = (%s)" % version,
            content
        )
        with open(conf["vfile"], "wb") as f:
            f.write(new_content)


def _git(project, args):
    print("%s> %s..." % (project, " ".join(shlex_quote(a) for a in args)))
    subprocess.check_call(
        ["git"] + list(args),
        cwd=projects[project]["dir"]
    )


@cli.command("git")
@click.argument('args', nargs=-1, required=True)
def git(args):
    """
    Run a git command on every project
    """
    for project, conf in projects.items():
        _git(project, args)
        print("")


@cli.command("sdist")
def sdist():
    """
    Build a source distribution
    """
    with empty_pythonpath():
        print("Building release...")
        if os.path.exists(DIST_DIR):
            shutil.rmtree(DIST_DIR)
        for project, conf in projects.items():
            print("Creating %s source distribution..." % project)
            subprocess.check_call(
                [
                    "python", "./setup.py", "-q",
                    "sdist", "--dist-dir", DIST_DIR, "--formats=gztar",
                    "bdist_wheel", "--dist-dir", DIST_DIR,
                ],
                cwd=conf["dir"]
            )

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

        with chdir(DIST_DIR):
            for project, conf in projects.items():
                print("Installing %s..." % project)
                subprocess.check_call([VENV_PIP, "install", "-q", sdist_name(project)])

            print("Running binaries...")
            for project, conf in projects.items():
                for tool in conf["tools"]:
                    tool = join(VENV_DIR, VENV_BIN, tool)
                    print("> %s --version" % tool)
                    print(subprocess.check_output([tool, "--version"]))

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


@cli.command("bdist")
@click.option("--use-existing-sdist/--no-use-existing-sdist", default=False)
@click.argument("pyinstaller_version", envvar="PYINSTALLER_VERSION", default="PyInstaller~=3.1.1")
@click.pass_context
def bdist(ctx, use_existing_sdist, pyinstaller_version):
    """
    Build a binary distribution
    """
    if os.path.exists(PYINSTALLER_TEMP):
        shutil.rmtree(PYINSTALLER_TEMP)
    if os.path.exists(PYINSTALLER_DIST):
        shutil.rmtree(PYINSTALLER_DIST)

    if not use_existing_sdist:
        ctx.invoke(sdist)

    print("Installing PyInstaller...")
    subprocess.check_call([VENV_PIP, "install", "-q", pyinstaller_version])

    for p, conf in projects.items():
        if conf["tools"]:
            with Archive(join(DIST_DIR, archive_name(p))) as archive:
                for tool in conf["tools"]:
                    spec = join(conf["dir"], "release", "%s.spec" % tool)
                    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",
                            spec
                        ]
                    )

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

                    archive.add(executable, os.path.basename(executable))
            print("Packed {}.".format(archive_name(p)))


@cli.command("upload-release")
@click.option('--username', prompt=True)
@click.password_option(confirmation_prompt=False)
@click.option('--repository', default="pypi")
@click.option("--sdist/--no-sdist", default=True)
@click.option("--wheel/--no-wheel", default=True)
def upload_release(username, password, repository, sdist, wheel):
    """
    Upload source distributions to PyPI
    """
    for project in projects.keys():
        files = []
        if sdist:
            files.append(sdist_name(project))
        if wheel:
            files.append(wheel_name(project))
        for f in files:
            print("Uploading {} to {}...".format(f, repository))
            subprocess.check_call([
                "twine",
                "upload",
                "-u", username,
                "-p", password,
                "-r", repository,
                join(DIST_DIR, f)
            ])


@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("--sdist/--no-sdist", default=False)
@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, sdist, 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:
        for project, conf in projects.items():
            dir_name = "snapshots/v{}".format(get_version(project))
            sftp.makedirs(dir_name)
            with sftp.cd(dir_name):
                files = []
                if sdist:
                    files.append(sdist_name(project))
                if wheel:
                    files.append(wheel_name(project))
                if bdist and conf["tools"]:
                    files.append(archive_name(project))

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

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

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

                    # add symlink
                    if sftp.lexists(symlink_path):
                        print("Removing {}...".format(symlink_path))
                        sftp.remove(symlink_path)
                    sftp.symlink("v{}/{}".format(get_version(project), remote_filename), symlink_path)


@cli.command("wizard")
@click.option('--next-version', prompt=True)
@click.option('--username', prompt="PyPI Username")
@click.password_option(confirmation_prompt=False, prompt="PyPI Password")
@click.option('--repository', default="pypi")
@click.pass_context
def wizard(ctx, next_version, username, password, repository):
    """
    Interactive Release Wizard
    """
    for project, conf in projects.items():
        is_dirty = subprocess.check_output(["git", "status", "--porcelain"], cwd=conf["dir"])
        if is_dirty:
            raise RuntimeError("%s repository is not clean." % project)

    # update contributors file
    ctx.invoke(contributors)

    # Build test release
    ctx.invoke(bdist)

    try:
        click.confirm("Please test the release now. Is it ok?", abort=True)
    except click.Abort:
        # undo changes
        ctx.invoke(git, args=["checkout", "CONTRIBUTORS"])
        raise

    # Everything ok - let's ship it!
    for p in projects.keys():
        _git(p, ["tag", "v" + get_version(p)])
    ctx.invoke(git, args=["push", "--tags"])
    ctx.invoke(
        upload_release,
        username=username, password=password, repository=repository
    )

    click.confirm("Now please wait until CI has built binaries. Finished?")

    # version bump commit
    ctx.invoke(set_version, version=next_version)
    ctx.invoke(
        git, args=["commit", "-a", "-m", "bump version"]
    )
    ctx.invoke(git, args=["push"])

    click.echo("All done!")


if __name__ == "__main__":
    cli()