#!/usr/bin/env python
"""
invoke script for releasing pyzmq

usage:

    invoke release 14.3.1

"""

# Copyright (C) PyZMQ Developers
# Distributed under the terms of the Modified BSD License.


from __future__ import print_function

import glob
import os
import pipes
import re
import shutil
import sys

from contextlib import contextmanager
from subprocess import check_call

from invoke import task, run as invoke_run

pjoin = os.path.join

repo = "git@github.com:zeromq/pyzmq"

py_exes = {
    '2.7' : "/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7",
    '3.4' : "/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4",
    'pypy': "/usr/local/bin/pypy",
}
egg_pys = {'2.7'}

tmp = "/tmp"
env_root = os.path.join(tmp, 'envs')
repo_root = pjoin(tmp, 'pyzmq-release')
sdist_root = pjoin(tmp, 'pyzmq-sdist')

def _py(py):
    return py_exes.get(py, py)

def run(cmd, **kwargs):
    """wrapper around invoke.run that accepts a Popen list"""
    if isinstance(cmd, list):
        cmd = " ".join(pipes.quote(s) for s in cmd)
    kwargs.setdefault('echo', True)
    return invoke_run(cmd, **kwargs)

@contextmanager
def cd(path):
    """Context manager for temporary CWD"""
    cwd = os.getcwd()
    os.chdir(path)
    try:
        yield
    finally:
        os.chdir(cwd)

@task
def clone_repo(reset=False):
    """Clone the repo"""
    if os.path.exists(repo_root) and reset:
        shutil.rmtree(repo_root)
    if os.path.exists(repo_root):
        with cd(repo_root):
            run("git pull")
    else:
        run("git clone %s %s" % (repo, repo_root))

@task
def patch_version(vs):
    """Patch zmq/sugar/version.py for the current release"""
    major, minor, patch = vs_to_tup(vs)
    version_py = pjoin(repo_root, 'zmq', 'sugar', 'version.py')
    print("patching %s with %s" % (version_py, vs))
    # read version.py, minus VERSION_ constants
    with open(version_py) as f:
        pre_lines = []
        post_lines = []
        lines = pre_lines
        for line in f:
            if line.startswith("VERSION_"):
                lines = post_lines
            else:
                lines.append(line)
    
    # write new version.py with given VERSION_ constants
    with open(version_py, 'w') as f:
        for line in pre_lines:
            f.write(line)
        f.write('VERSION_MAJOR = %s\n' % major)
        f.write('VERSION_MINOR = %s\n' % minor)
        f.write('VERSION_PATCH = %s\n' % patch)
        f.write('VERSION_EXTRA = ""\n')
        for line in post_lines:
            f.write(line)

@task
def tag(vs, push=False):
    """Make the tag (don't push)"""
    patch_version(vs)
    with cd(repo_root):
        run('git commit -a -m "release {}"'.format(vs))
        run('git tag -a -m "release {0}" v{0}'.format(vs))
        if push:
            run('git push')
            run('git push --tags')

def make_env(py_exe, *packages):
    """Make a virtualenv
    
    Assumes `which python` has the `virtualenv` package
    """
    py_exe = py_exes.get(py_exe, py_exe)
    
    if not os.path.exists(env_root):
        os.makedirs(env_root)
    
    env = os.path.join(env_root, os.path.basename(py_exe))
    py = pjoin(env, 'bin', 'python')
    # new env
    if not os.path.exists(py):
        run('python -m virtualenv {} -p {}'.format(
            pipes.quote(env),
            pipes.quote(py_exe),
        ))
        py = pjoin(env, 'bin', 'python')
        run([py, '-V'])
        install(py, 'pip', 'setuptools')
    install(py, *packages)
    return py

def build_sdist(py, upload=False):
    """Build sdists
    
    Returns the path to the tarball
    """
    install(py, 'cython')
    with cd(repo_root):
        cmd = [py, 'setup.py', 'sdist', '--formats=zip,gztar']
        if upload:
            cmd.append('upload')
        run(cmd)
    
    return glob.glob(pjoin(repo_root, 'dist', '*.tar.gz'))[0]

@task
def sdist(vs, upload=False):
    clone_repo()
    patch_version(vs)
    tag(vs, push=upload)
    py = make_env('2.7', 'cython')
    tarball = build_sdist(py, upload=upload)
    return untar(tarball)

def install(py, *packages):
    packages
    run([py, '-m', 'pip', 'install', '--upgrade'] + list(packages))

def vs_to_tup(vs):
    """version string to tuple"""
    return re.findall(r'\d+', vs)

def tup_to_vs(tup):
    """tuple to version string"""
    return '.'.join(tup)

def untar(tarball):
    if os.path.exists(sdist_root):
        shutil.rmtree(sdist_root)
    os.makedirs(sdist_root)
    with cd(sdist_root):
        run(['tar', '-xzf', tarball])
    
    return glob.glob(pjoin(sdist_root, '*'))[0]

def bdist(py, upload=False, wheel=True, egg=False):
    py = make_env(py, 'wheel')
    cmd = [py, 'setup.py']
    if wheel:
        cmd.append('bdist_wheel')
    if egg:
        cmd.append('bdist_egg')
    if upload:
        cmd.append('upload')
    cmd.append('--zmq=bundled')
    
    run(cmd)

@task
def release(vs, upload=False):
    """Release pyzmq"""
    # start from scrach with clone and envs
    clone_repo(reset=True)
    if os.path.exists(env_root):
        shutil.rmtree(env_root)
    
    path = sdist(vs, upload=upload)
    
    with cd(path):
        for v in py_exes:
            bdist(v, upload=upload, wheel=True, egg=(v in egg_pys))

