# encoding: utf-8
"""
This module defines the things that are used in setup.py for building IPython

This includes:

    * The basic arguments to setup
    * Functions for finding things like packages, package data, etc.
    * A function for checking dependencies.
"""

# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.

from __future__ import print_function

import errno
import os
import sys

from distutils import log
from distutils.command.build_py import build_py
from distutils.command.build_scripts import build_scripts
from distutils.command.install import install
from distutils.command.install_scripts import install_scripts
from distutils.cmd import Command
from distutils.errors import DistutilsExecError
from fnmatch import fnmatch
from glob import glob
from subprocess import Popen, PIPE

from setupext import install_data_ext

#-------------------------------------------------------------------------------
# Useful globals and utility functions
#-------------------------------------------------------------------------------

# A few handy globals
isfile = os.path.isfile
pjoin = os.path.join
repo_root = os.path.dirname(os.path.abspath(__file__))

def oscmd(s):
    print(">", s)
    os.system(s)

# Py3 compatibility hacks, without assuming IPython itself is installed with
# the full py3compat machinery.

try:
    execfile
except NameError:
    def execfile(fname, globs, locs=None):
        locs = locs or globs
        exec(compile(open(fname).read(), fname, "exec"), globs, locs)

# A little utility we'll need below, since glob() does NOT allow you to do
# exclusion on multiple endings!
def file_doesnt_endwith(test,endings):
    """Return true if test is a file and its name does NOT end with any
    of the strings listed in endings."""
    if not isfile(test):
        return False
    for e in endings:
        if test.endswith(e):
            return False
    return True

#---------------------------------------------------------------------------
# Basic project information
#---------------------------------------------------------------------------

# release.py contains version, authors, license, url, keywords, etc.
execfile(pjoin(repo_root, 'IPython','core','release.py'), globals())

# Create a dict with the basic information
# This dict is eventually passed to setup after additional keys are added.
setup_args = dict(
      name             = name,
      version          = version,
      description      = description,
      long_description = long_description,
      author           = author,
      author_email     = author_email,
      url              = url,
      download_url     = download_url,
      license          = license,
      platforms        = platforms,
      keywords         = keywords,
      classifiers      = classifiers,
      cmdclass         = {'install_data': install_data_ext},
      )


#---------------------------------------------------------------------------
# Find packages
#---------------------------------------------------------------------------

def find_packages():
    """
    Find all of IPython's packages.
    """
    excludes = ['deathrow', 'quarantine']
    packages = []
    for dir,subdirs,files in os.walk('IPython'):
        package = dir.replace(os.path.sep, '.')
        if any(package.startswith('IPython.'+exc) for exc in excludes):
            # package is to be excluded (e.g. deathrow)
            continue
        if '__init__.py' not in files:
            # not a package
            continue
        packages.append(package)
    return packages

#---------------------------------------------------------------------------
# Find package data
#---------------------------------------------------------------------------

def find_package_data():
    """
    Find IPython's package_data.
    """
    # This is not enough for these things to appear in an sdist.
    # We need to muck with the MANIFEST to get this to work
    
    package_data = {
        'IPython.core' : ['profile/README*'],
        'IPython.core.tests' : ['*.png', '*.jpg', 'daft_extension/*.py'],
        'IPython.lib.tests' : ['*.wav'],
        'IPython.testing.plugin' : ['*.txt'],
    }
    
    return package_data


def check_package_data(package_data):
    """verify that package_data globs make sense"""
    print("checking package data")
    for pkg, data in package_data.items():
        pkg_root = pjoin(*pkg.split('.'))
        for d in data:
            path = pjoin(pkg_root, d)
            if '*' in path:
                assert len(glob(path)) > 0, "No files match pattern %s" % path
            else:
                assert os.path.exists(path), "Missing package data: %s" % path


def check_package_data_first(command):
    """decorator for checking package_data before running a given command
    
    Probably only needs to wrap build_py
    """
    class DecoratedCommand(command):
        def run(self):
            check_package_data(self.package_data)
            command.run(self)
    return DecoratedCommand


#---------------------------------------------------------------------------
# Find data files
#---------------------------------------------------------------------------

def make_dir_struct(tag,base,out_base):
    """Make the directory structure of all files below a starting dir.

    This is just a convenience routine to help build a nested directory
    hierarchy because distutils is too stupid to do this by itself.

    XXX - this needs a proper docstring!
    """

    # we'll use these a lot below
    lbase = len(base)
    pathsep = os.path.sep
    lpathsep = len(pathsep)

    out = []
    for (dirpath,dirnames,filenames) in os.walk(base):
        # we need to strip out the dirpath from the base to map it to the
        # output (installation) path.  This requires possibly stripping the
        # path separator, because otherwise pjoin will not work correctly
        # (pjoin('foo/','/bar') returns '/bar').

        dp_eff = dirpath[lbase:]
        if dp_eff.startswith(pathsep):
            dp_eff = dp_eff[lpathsep:]
        # The output path must be anchored at the out_base marker
        out_path = pjoin(out_base,dp_eff)
        # Now we can generate the final filenames. Since os.walk only produces
        # filenames, we must join back with the dirpath to get full valid file
        # paths:
        pfiles = [pjoin(dirpath,f) for f in filenames]
        # Finally, generate the entry we need, which is a pari of (output
        # path, files) for use as a data_files parameter in install_data.
        out.append((out_path, pfiles))

    return out


def find_data_files():
    """
    Find IPython's data_files.

    Just man pages at this point.
    """

    manpagebase = pjoin('share', 'man', 'man1')

    # Simple file lists can be made by hand
    manpages = [f for f in glob(pjoin('docs','man','*.1.gz')) if isfile(f)]
    if not manpages:
        # When running from a source tree, the manpages aren't gzipped
        manpages = [f for f in glob(pjoin('docs','man','*.1')) if isfile(f)]

    # And assemble the entire output list
    data_files = [ (manpagebase, manpages) ]

    return data_files


def make_man_update_target(manpage):
    """Return a target_update-compliant tuple for the given manpage.

    Parameters
    ----------
    manpage : string
      Name of the manpage, must include the section number (trailing number).

    Example
    -------

    >>> make_man_update_target('ipython.1') #doctest: +NORMALIZE_WHITESPACE
    ('docs/man/ipython.1.gz',
     ['docs/man/ipython.1'],
     'cd docs/man && gzip -9c ipython.1 > ipython.1.gz')
    """
    man_dir = pjoin('docs', 'man')
    manpage_gz = manpage + '.gz'
    manpath = pjoin(man_dir, manpage)
    manpath_gz = pjoin(man_dir, manpage_gz)
    gz_cmd = ( "cd %(man_dir)s && gzip -9c %(manpage)s > %(manpage_gz)s" %
               locals() )
    return (manpath_gz, [manpath], gz_cmd)

# The two functions below are copied from IPython.utils.path, so we don't need
# to import IPython during setup, which fails on Python 3.

def target_outdated(target,deps):
    """Determine whether a target is out of date.

    target_outdated(target,deps) -> 1/0

    deps: list of filenames which MUST exist.
    target: single filename which may or may not exist.

    If target doesn't exist or is older than any file listed in deps, return
    true, otherwise return false.
    """
    try:
        target_time = os.path.getmtime(target)
    except os.error:
        return 1
    for dep in deps:
        dep_time = os.path.getmtime(dep)
        if dep_time > target_time:
            #print "For target",target,"Dep failed:",dep # dbg
            #print "times (dep,tar):",dep_time,target_time # dbg
            return 1
    return 0


def target_update(target,deps,cmd):
    """Update a target with a given command given a list of dependencies.

    target_update(target,deps,cmd) -> runs cmd if target is outdated.

    This is just a wrapper around target_outdated() which calls the given
    command if target is outdated."""

    if target_outdated(target,deps):
        os.system(cmd)

#---------------------------------------------------------------------------
# Find scripts
#---------------------------------------------------------------------------

def find_entry_points():
    """Defines the command line entry points for IPython

    This always uses setuptools-style entry points. When setuptools is not in
    use, our own build_scripts_entrypt class below parses these and builds
    command line scripts.

    Each of our entry points gets both a plain name, e.g. ipython, and one
    suffixed with the Python major version number, e.g. ipython3. 
    """
    ep = [
            'ipython%s = IPython:start_ipython',
            'iptest%s = IPython.testing.iptestcontroller:main',
        ]
    suffix = str(sys.version_info[0])
    return [e % '' for e in ep] + [e % suffix for e in ep]

script_src = """#!{executable}
# This script was automatically generated by setup.py
if __name__ == '__main__':
    from {mod} import {func}
    {func}()
"""

class build_scripts_entrypt(build_scripts):
    """Build the command line scripts
    
    Parse setuptools style entry points and write simple scripts to run the
    target functions.
    
    On Windows, this also creates .cmd wrappers for the scripts so that you can
    easily launch them from a command line.
    """
    def run(self):
        self.mkpath(self.build_dir)
        outfiles = []
        for script in find_entry_points():
            name, entrypt = script.split('=')
            name = name.strip()
            entrypt = entrypt.strip()
            outfile = os.path.join(self.build_dir, name)
            outfiles.append(outfile)
            print('Writing script to', outfile)

            mod, func = entrypt.split(':')
            with open(outfile, 'w') as f:
                f.write(script_src.format(executable=sys.executable,
                                          mod=mod, func=func))
            
            if sys.platform == 'win32':
                # Write .cmd wrappers for Windows so 'ipython' etc. work at the
                # command line
                cmd_file = os.path.join(self.build_dir, name + '.cmd')
                cmd = '@"{python}" "%~dp0\{script}" %*\r\n'.format(
                        python=sys.executable, script=name)
                log.info("Writing %s wrapper script" % cmd_file)
                with open(cmd_file, 'w') as f:
                    f.write(cmd)

        return outfiles, outfiles

class install_lib_symlink(Command):
    user_options = [
        ('install-dir=', 'd', "directory to install to"),
        ]

    def initialize_options(self):
        self.install_dir = None

    def finalize_options(self):
        self.set_undefined_options('symlink',
                                   ('install_lib', 'install_dir'),
                                  )

    def run(self):
        if sys.platform == 'win32':
            raise Exception("This doesn't work on Windows.")
        pkg = os.path.join(os.getcwd(), 'IPython')
        dest = os.path.join(self.install_dir, 'IPython')
        if os.path.islink(dest):
            print('removing existing symlink at %s' % dest)
            os.unlink(dest)
        print('symlinking %s -> %s' % (pkg, dest))
        os.symlink(pkg, dest)

class unsymlink(install):
    def run(self):
        dest = os.path.join(self.install_lib, 'IPython')
        if os.path.islink(dest):
            print('removing symlink at %s' % dest)
            os.unlink(dest)
        else:
            print('No symlink exists at %s' % dest)

class install_symlinked(install):
    def run(self):
        if sys.platform == 'win32':
            raise Exception("This doesn't work on Windows.")

        # Run all sub-commands (at least those that need to be run)
        for cmd_name in self.get_sub_commands():
            self.run_command(cmd_name)
    
    # 'sub_commands': a list of commands this command might have to run to
    # get its work done.  See cmd.py for more info.
    sub_commands = [('install_lib_symlink', lambda self:True),
                    ('install_scripts_sym', lambda self:True),
                   ]

class install_scripts_for_symlink(install_scripts):
    """Redefined to get options from 'symlink' instead of 'install'.
    
    I love distutils almost as much as I love setuptools.
    """
    def finalize_options(self):
        self.set_undefined_options('build', ('build_scripts', 'build_dir'))
        self.set_undefined_options('symlink',
                                   ('install_scripts', 'install_dir'),
                                   ('force', 'force'),
                                   ('skip_build', 'skip_build'),
                                  )


#---------------------------------------------------------------------------
# VCS related
#---------------------------------------------------------------------------


def git_prebuild(pkg_dir, build_cmd=build_py):
    """Return extended build or sdist command class for recording commit
    
    records git commit in IPython.utils._sysinfo.commit
    
    for use in IPython.utils.sysinfo.sys_info() calls after installation.
    """
    
    class MyBuildPy(build_cmd):
        ''' Subclass to write commit data into installation tree '''
        def run(self):
            build_cmd.run(self)
            # this one will only fire for build commands
            if hasattr(self, 'build_lib'):
                self._record_commit(self.build_lib)
        
        def make_release_tree(self, base_dir, files):
            # this one will fire for sdist
            build_cmd.make_release_tree(self, base_dir, files)
            self._record_commit(base_dir)
        
        def _record_commit(self, base_dir):
            import subprocess
            proc = subprocess.Popen('git rev-parse --short HEAD',
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE,
                                    shell=True)
            repo_commit, _ = proc.communicate()
            repo_commit = repo_commit.strip().decode("ascii")
            
            out_pth = pjoin(base_dir, pkg_dir, 'utils', '_sysinfo.py')
            if os.path.isfile(out_pth) and not repo_commit:
                # nothing to write, don't clobber
                return
            
            print("writing git commit '%s' to %s" % (repo_commit, out_pth))
            
            # remove to avoid overwriting original via hard link
            try:
                os.remove(out_pth)
            except (IOError, OSError):
                pass
            with open(out_pth, 'w') as out_file:
                out_file.writelines([
                    '# GENERATED BY setup.py\n',
                    'commit = u"%s"\n' % repo_commit,
                ])
    return MyBuildPy

