#!/usr/bin/env python
"""Windows install scripts.
"""

import sys
import os
import os.path
import string
import distutils.sysconfig as sysconfig
import distutils.dir_util as dir_util
from os.path import join as pathjoin
from distutils.file_util import copy_file
from distutils.errors import DistutilsExecError

import clewn.vim as vim
import clewn.misc as misc

ICON_NAME = 'clewn.ico'
PYCLEWN_SHORTCUT = 'Pyclewn.lnk'

def icon(vimdir):
    """Return icon file tuple to be used as data file in distutils setup."""
    return (vimdir, [pathjoin('images', ICON_NAME)])

def vim_features():
    """Abort if missing required Vim feature."""
    output = vim.exec_vimcmd(['version'])

    print >> sys.stderr, 'checking netbeans support in vim:',
    try:
        output.index('+netbeans_intg')
    except ValueError:
        raise DistutilsExecError, 'netbeans support in vim is required'
    print >> sys.stderr, 'yes'

    print >> sys.stderr, 'checking auto commands support in vim:',
    try:
        output.index('+autocmd')
    except ValueError:
        raise DistutilsExecError, 'auto commands support in vim is required'
    print >> sys.stderr, 'yes'

@misc.previous_evaluation
def vimdir():
    """Return the vim runtime files directory."""
    if 'vimdir' in os.environ:
        dir = os.environ['vimdir']
    else:
        path = vim.exec_vimcmd(['echon $VIM'])
        path = path.strip(' \t\r\n')
        if not os.path.isdir(path):
            nodir = ('Invalid data files path. $VIM="%s" is returned'
                ' by Vim, but this is not an existing directory.' % path)
            raise DistutilsExecError, nodir
        dir = pathjoin(path, 'vimfiles')
    print 'Vim user data files location: "%s"' % dir
    return dir

def build_vimhelp():
    """Add pyclewn help to Vim help."""
    helpdir = pathjoin(vimdir(), 'doc')
    print >> sys.stderr, 'running Vim help tags file generation in %s' % helpdir
    vim.exec_vimcmd(['helptags ' + helpdir, 'echo v:version'])

def unlink(filename):
    """Delete a file."""
    try:
        os.unlink(filename)
    except OSError:
        pass

def substitute_autoload(runtime_dir, mapping):
    """Substitute templates in the autoload plugin."""
    plugin = pathjoin(pathjoin(runtime_dir, 'autoload'), 'pyclewn.vim')
    f = open(plugin)
    content = f.read()
    f.close()
    content = string.Template(content).substitute(mapping)
    f = open(plugin, 'w')
    f.write(content)
    f.close()

def install():
    """Write the bat file and copy the runtime files."""
    prefix = sysconfig.get_config_var('prefix')
    scripts = pathjoin(prefix, 'scripts')
    vim_features()

    # install runtime files
    runtime_dir = pathjoin(prefix, 'pyclewn')
    icon_file = pathjoin(runtime_dir, ICON_NAME)
    copy_file(icon_file, scripts)
    print >> sys.stderr, 'copying file %s' % icon_file
    unlink(icon_file)

    # substitute templates in the autoload plugin
    clewnbat = pathjoin(scripts, 'pyclewn.bat')
    mapping = {'pgm': misc.quote(clewnbat), 'start': 'start '}
    substitute_autoload(runtime_dir, mapping)

    for filename in dir_util.copy_tree(runtime_dir, vimdir()):
        print >> sys.stderr, 'copying file %s' % filename
    print >> sys.stderr, 'removing directory %s' % runtime_dir
    dir_util.remove_tree(runtime_dir)

    build_vimhelp()

    # create pyclewn.bat
    pyexe = pathjoin(prefix, 'python.exe')
    scriptpy = pathjoin(scripts, 'pyclewn')
    f = open(clewnbat, 'w')
    f.write("@start %s %s %%*\n" % (pyexe, scriptpy))
    f.close()

    # create Windows shortcut
    create_shortcut(
        clewnbat,
        'Pyclewn allows using Vim as a front end to a debugger.',
        PYCLEWN_SHORTCUT,
        r'--pgm=C:\mingw\bin\gdb.exe --daemon',
        '',
        pathjoin(scripts, ICON_NAME),
        0)

    # copy shortcut to Desktop when it does not exist
    desktop_path = get_special_folder_path('CSIDL_DESKTOPDIRECTORY')
    pyclewn_shortcut = pathjoin(desktop_path, PYCLEWN_SHORTCUT)
    if not os.path.exists(pyclewn_shortcut):
        copy_file(PYCLEWN_SHORTCUT, desktop_path)
        print >> sys.stderr, 'copying pyclewn to the desktop: %s' % pyclewn_shortcut

    # cleanup
    unlink(PYCLEWN_SHORTCUT)
    unlink(pathjoin(scripts, 'pyclewn_install.py'))
    unlink(pathjoin(scripts, 'pyclewn_install.pyc'))
    unlink(pathjoin(scripts, 'pyclewn_install.pyo'))

    print >> sys.stderr, 'pyclewn postinstall completed'

def uninstall():
    """Uninstall on Windows."""
    prefix = sysconfig.get_config_var('prefix')
    scripts = pathjoin(prefix, 'scripts')

    # remove scripts, icon and shortcut
    unlink(pathjoin(scripts, 'pyclewn'))
    unlink(pathjoin(scripts, 'pyclewn.bat'))
    unlink(pathjoin(scripts, ICON_NAME))
    unlink(pathjoin(scripts, 'pyclewn_install.py'))
    desktop_path = get_special_folder_path('CSIDL_DESKTOPDIRECTORY')
    unlink(pathjoin(desktop_path, PYCLEWN_SHORTCUT))

    # remove vim files and rebuild vim help
    unlink(pathjoin(pathjoin(vimdir(), 'doc'), 'pyclewn.txt'))
    unlink(pathjoin(pathjoin(vimdir(), 'syntax'), 'dbgvar.vim'))
    unlink(pathjoin(pathjoin(vimdir(), 'plugin'), 'pyclewn.vim'))
    unlink(pathjoin(pathjoin(vimdir(), 'autoload'), 'pyclewn.vim'))
    build_vimhelp()

if __name__ == '__main__':
    if os.name == 'nt':
        try:
            if sys.argv[1] == '-install':
                install()
            elif sys.argv[1] == '-remove':
                uninstall()
        except Exception, err:
            # let the python installer print the error
            print >> sys.stderr, err