"""
Create a Windows installer EXE.

usage: create_win_installer  [<revision>]

where <revision> is an optional revision number - if not supplied then
                 update through svn and use latest revision
                 
This program expects to be run from the root directory of the ANUGA branch
being released.

This script works only on Windows!
"""


import sys
import os
import getopt
import tempfile
import shutil

import dirs_to_distribute
from anuga.utilities.data_audit_wrapper import IP_verified

from anuga.utilities.system_tools import get_user_name, get_host_name
from anuga.abstract_2d_finite_volumes.util import get_revision_number
from anuga.abstract_2d_finite_volumes.util import store_version_info
from anuga.config import major_revision


# name of 'home' directory containing releases
ANUGA_RELEASE_DIR = 'anuga_releases'

# prefix for temporary directory
TEMP_DIR_PREFIX = 'anuga_release_'

# path to and required contents of documentation directory
DOC_PATH = os.path.join('anuga_core', 'documentation', 'user_manual')
DOC_FILES = ['anuga_user_manual.pdf',
             'anuga_installation_guide.pdf',
             'anuga_whats_new.pdf']


# path to NSIS install directory
NSIS_PATH = r'C:\Program Files\NSIS'
NSIS_EXE = os.path.join(NSIS_PATH, 'makensis.exe')

# the name of the subversion commandline client
SVN_CLIENT = 'svn'


def abort(msg, stop=True):
    """Some sort of error, report and abort."""

    xlog('*' * 80)
    xlog(msg)
    xlog('*' * 80)
    if stop:
        sys.exit(10)


def check_doc(temp_dir, release_name):
    """Make sure all the documentation is present.

    temp_dir      released code working directory
    release_name  ANUGA release name

    Returns if everything OK.
    """

    bad = False
    
    for file in DOC_FILES:
        doc_file = os.path.join(DOC_PATH, file)
        if not os.path.isfile(doc_file):
            xlog('Documentation file %s is missing.' % doc_file)
            bad = True

    if bad and not Force:
        abort('Sorry, documentation files are missing.\n'
              'You must release on Linux before Windows.')


def check_IP(temp_dir, verbose=False):
    """Check IP statements in release directories."""

    if not IP_verified(temp_dir, verbose=verbose):
        if not Force:
            abort('Files have not been verified for IP.\n'
                  'Each data file must have a licence file with it.')


def compile_nsi_file():
    """Compile the installer NSI file."""

    # figure out where the *.nsi file actually is
    nsi_file = os.path.join(BranchDir, 'installation_files', 'windows',
                            'installer.nsi')
    
    do_cmd('"%s" /V2 %s' % (NSIS_EXE, nsi_file))


def copy_release_directories(revision, temp_dir):
    """Get release dirs (correct version) into release directory."""
    
    for src in dirs_to_distribute.dirmap:
        dst = os.path.join(temp_dir, dirs_to_distribute.dirmap[src])
        do_cmd('%s export -r %s --quiet %s %s'
               % (SVN_CLIENT, revision, src, dst))


def do_cmd(cmd, ignore_errors=False):
    """Execute a command, optionally ignore errors."""

    try:
        xlog(cmd)
        os.system(cmd)
    except:
        if not ignore_errors:
            raise


def get_directories(rel_name):
    """Create release and temporary directories, return paths.

    rel_name  the ANUGA release name
    """

    # create the release directory
    rel_area = os.path.join('~', ANUGA_RELEASE_DIR)
    rel_area = os.path.expanduser(rel_area)

    rel_dir = os.path.join(rel_area, rel_name)
    if os.path.isdir(rel_dir):
        if Force:
            os.removedirs(rel_dir)
        else:
            abort("Sorry, release directory '%s' already exists.\n"
                  "Please delete that directory first." % rel_dir)
        
    os.makedirs(rel_dir)

    # create a temporary scratch directory
    temp_dir = tempfile.mkdtemp(suffix='', prefix=TEMP_DIR_PREFIX)

    return (rel_dir, temp_dir)
    

def get_release_name():
    """Get release information and create release name.

    Get release numbers from the current directory.

    Returns a string which is of the form 'anuga-X.Y.Z' where X is the
    major release number, Y is the minor and Z is the bug number.
    """
    
    curr_dir = os.getcwd()
    curr_dir = os.path.basename(curr_dir)
    split_dir = curr_dir.split('_')
    if len(split_dir) < 2:
        abort('You must run this script in an ANUGA branch directory.')
    if split_dir[0] != 'anuga':
        abort('You must run this script in an ANUGA branch directory.')

    major = split_dir[1]
    if len(split_dir) < 3:
        minor = '0'
    else:
        minor = split_dir[2]
        
    if len(split_dir) < 4:
        bug = '0'
    else:
        bug = split_dir[3]

    return 'anuga-%s.%s.%s' % (major, minor, bug)
    

def get_svn_revision():
    """Get the current revision number from svn.

    This uses the CollabNet subversion client.
    """

    try:
        fid = os.popen('%s info' % SVN_CLIENT)
    except:
        abort('Subversion commandline client not found')

    lines = fid.readlines()
    fid.close()

    for l in lines:
        l = l.strip()
        if l.startswith('Last Changed Rev:'):
            (_, revision) = l.split(':', 1)
            try:
                revision = int(revision)
            except ValueError:
                abort('"svn info" did not return expected line: ' + l)
            return revision

    abort('"svn info" did not return expected line "Last Changed Rev:"')


def make_installer(revision):
    """Make a windows installer.

    revision  the revision number (string) to release
              (may be None, meaning 'use latest')
    """

    global BranchDir

    # get the current branch directory path
    BranchDir = os.getcwd()
    
    # if revision is None (not supplied) do update and get latest revision
    if revision is None:
        do_cmd('%s up' % SVN_CLIENT)
        revision = get_svn_revision()
        
    # get release name from current directory
    release_name = get_release_name()

    # get working directory paths (directories have been created)
    (release_dir, temp_dir) = get_directories(release_name)

    # get the ANUGA directories that are being released
    copy_release_directories(revision, temp_dir)

    # check IP data for release directories
    check_IP(temp_dir, verbose=True)

    # generate the LaTeX documentation
    check_doc(temp_dir, release_name)

    # create ZIP release file, put into release dir
    make_zip_file(temp_dir, release_name, release_dir)

    # compile Windows *.nsi file
    # creates EXE in <BranchDir>\installation_files\windows
    # check we have required files/directories
    # remove all generated *.exe files
    anuga_dir = os.path.join(BranchDir, 'installation_files', 'windows',
                             'files', release_name)
    if not os.path.isdir(anuga_dir):
        abort("Sorry, directory %s doesn't exist.\n"
              "You need to run the Linux create distribution first."
              % anuga_dir)
        
        
    src = os.path.join(BranchDir, 'installation_files', 'windows', '*.exe')
    do_cmd('del /Q %s' % src)    
    compile_nsi_file()

    # copy the create EXE to the release directory
    do_cmd('move /Y %s %s' % (src, release_dir))

    # clean up
    shutil.rmtree(temp_dir)


def make_zip_file(temp_dir, release_name, release_dir):
    """Make a ZIP file, copy to release directory.

    temp_dir      directory where we copied release files
    release_name  the release name
    release_dir   destination for the ZIP file
    """

    # create .tgz file in temp_dir
    
    
    
def usage(msg=None):
    """Give befuddled user some help."""

    if msg:
        print(msg)
    print('usage: create_win_installer [<revision_number>]\n'
          'where <revision_number> is an optional revision number to release.')


def xlog(msg):
    """Print and log a message."""

    print(msg)
    
    # uncomment this to get file logging
##    log(msg)
    

if __name__ == '__main__':
    global Force
    
    if sys.platform != 'win32':
        msg = ('This script is not written for Linux.  '
               'Please run it on a Windows platform.')
        raise Exception(msg)

    argv = sys.argv[1:]

    try:
        opts, args = getopt.getopt(argv, 'hf', ['help', 'force'])
    except getopt.error, msg:
        usage()
        sys.exit(10)

    Force = False
    for (opt, param) in opts:
        if opt in ['-h', '--help']:
            usage()
            sys.exit(0)
        elif opt in ['-f', '--force']:
            Force = True

    if len(args) > 1:
        usage()
        sys.exit(10)

    revision = None
    if len(args) == 1:
        try:
            revision = int(args[0])
        except ValueError:
            usage()
            sys.exit(10)

    make_installer(revision)