"""Script to generate doxygen documentation.
"""
from __future__ import print_function
from devtools import tarball
import re
import os
import os.path
import sys
import shutil

def find_program(*filenames):
    """find a program in folders path_lst, and sets env[var]
    @param filenames: a list of possible names of the program to search for
    @return: the full path of the filename if found, or '' if filename could not be found
"""
    paths = os.environ.get('PATH', '').split(os.pathsep)
    suffixes = ('win32' in sys.platform ) and '.exe .com .bat .cmd' or ''
    for filename in filenames:
        for name in [filename+ext for ext in suffixes.split()]:
            for directory in paths:
                full_path = os.path.join(directory, name)
                if os.path.isfile(full_path):
                    return full_path
    return ''

def do_subst_in_file(targetfile, sourcefile, dict):
    """Replace all instances of the keys of dict with their values.
    For example, if dict is {'%VERSION%': '1.2345', '%BASE%': 'MyProg'},
    then all instances of %VERSION% in the file will be replaced with 1.2345 etc.
    """
    try:
        f = open(sourcefile, 'rb')
        contents = f.read()
        f.close()
    except:
        print("Can't read source file %s"%sourcefile)
        raise
    for (k,v) in list(dict.items()):
        v = v.replace('\\','\\\\') 
        contents = re.sub(k, v, contents)
    try:
        f = open(targetfile, 'wb')
        f.write(contents)
        f.close()
    except:
        print("Can't write target file %s"%targetfile)
        raise

def run_doxygen(doxygen_path, config_file, working_dir, is_silent):
    config_file = os.path.abspath( config_file )
    doxygen_path = doxygen_path
    old_cwd = os.getcwd()
    try:
        os.chdir( working_dir )
        cmd = [doxygen_path, config_file]
        print('Running:', ' '.join( cmd ))
        try:
            import subprocess
        except:
            if os.system( ' '.join( cmd ) ) != 0:
                print('Documentation generation failed')
                return False
        else:
            if is_silent:
                process = subprocess.Popen( cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT )
            else:
                process = subprocess.Popen( cmd )
            stdout, _ = process.communicate()
            if process.returncode:
                print('Documentation generation failed:')
                print(stdout)
                return False
        return True
    finally:
        os.chdir( old_cwd )

def build_doc( options,  make_release=False ):
    if make_release:
        options.make_tarball = True
        options.with_dot = True
        options.with_html_help = True
        options.with_uml_look = True
        options.open = False
        options.silent = True

    version = open('version','rt').read().strip()
    output_dir = 'dist/doxygen' # relative to doc/doxyfile location.
    if not os.path.isdir( output_dir ):
        os.makedirs( output_dir )
    top_dir = os.path.abspath( '.' )
    html_output_dirname = 'jsoncpp-api-html-' + version
    tarball_path = os.path.join( 'dist', html_output_dirname + '.tar.gz' )
    warning_log_path = os.path.join( output_dir, '../jsoncpp-doxygen-warning.log' )
    html_output_path = os.path.join( output_dir, html_output_dirname )
    def yesno( bool ):
        return bool and 'YES' or 'NO'
    subst_keys = {
        '%JSONCPP_VERSION%': version,
        '%DOC_TOPDIR%': '',
        '%TOPDIR%': top_dir,
        '%HTML_OUTPUT%': os.path.join( '..', output_dir, html_output_dirname ),
        '%HAVE_DOT%': yesno(options.with_dot),
        '%DOT_PATH%': os.path.split(options.dot_path)[0],
        '%HTML_HELP%': yesno(options.with_html_help),
        '%UML_LOOK%': yesno(options.with_uml_look),
        '%WARNING_LOG_PATH%': os.path.join( '..', warning_log_path )
        }

    if os.path.isdir( output_dir ):
        print('Deleting directory:', output_dir)
        shutil.rmtree( output_dir )
    if not os.path.isdir( output_dir ):
        os.makedirs( output_dir )

    do_subst_in_file( 'doc/doxyfile', 'doc/doxyfile.in', subst_keys )
    ok = run_doxygen( options.doxygen_path, 'doc/doxyfile', 'doc', is_silent=options.silent )
    if not options.silent:
        print(open(warning_log_path, 'rb').read())
    index_path = os.path.abspath(os.path.join('doc', subst_keys['%HTML_OUTPUT%'], 'index.html'))
    print('Generated documentation can be found in:')
    print(index_path)
    if options.open:
        import webbrowser
        webbrowser.open( 'file://' + index_path )
    if options.make_tarball:
        print('Generating doc tarball to', tarball_path)
        tarball_sources = [
            output_dir,
            'README.txt',
            'LICENSE',
            'NEWS.txt',
            'version'
            ]
        tarball_basedir = os.path.join( output_dir, html_output_dirname )
        tarball.make_tarball( tarball_path, tarball_sources, tarball_basedir, html_output_dirname )
    return tarball_path, html_output_dirname

def main():
    usage = """%prog
    Generates doxygen documentation in build/doxygen.
    Optionaly makes a tarball of the documentation to dist/.

    Must be started in the project top directory.    
    """
    from optparse import OptionParser
    parser = OptionParser(usage=usage)
    parser.allow_interspersed_args = False
    parser.add_option('--with-dot', dest="with_dot", action='store_true', default=False,
        help="""Enable usage of DOT to generate collaboration diagram""")
    parser.add_option('--dot', dest="dot_path", action='store', default=find_program('dot'),
        help="""Path to GraphViz dot tool. Must be full qualified path. [Default: %default]""")
    parser.add_option('--doxygen', dest="doxygen_path", action='store', default=find_program('doxygen'),
        help="""Path to Doxygen tool. [Default: %default]""")
    parser.add_option('--with-html-help', dest="with_html_help", action='store_true', default=False,
        help="""Enable generation of Microsoft HTML HELP""")
    parser.add_option('--no-uml-look', dest="with_uml_look", action='store_false', default=True,
        help="""Generates DOT graph without UML look [Default: False]""")
    parser.add_option('--open', dest="open", action='store_true', default=False,
        help="""Open the HTML index in the web browser after generation""")
    parser.add_option('--tarball', dest="make_tarball", action='store_true', default=False,
        help="""Generates a tarball of the documentation in dist/ directory""")
    parser.add_option('-s', '--silent', dest="silent", action='store_true', default=False,
        help="""Hides doxygen output""")
    parser.enable_interspersed_args()
    options, args = parser.parse_args()
    build_doc( options )

if __name__ == '__main__':
    main()