#!/usr/bin/python3
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##
## Copyright (C) 2014-2016, New York University.
## Copyright (C) 2011-2014, NYU-Poly.
## Copyright (C) 2006-2011, University of Utah.
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## Contact: contact@vistrails.org
##
## This file is part of VisTrails.
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
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##  - Redistributions of source code must retain the above copyright notice,
##    this list of conditions and the following disclaimer.
##  - Redistributions in binary form must reproduce the above copyright
##    notice, this list of conditions and the following disclaimer in the
##    documentation and/or other materials provided with the distribution.
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##    contributors may be used to endorse or promote products derived from
##    this software without specific prior written permission.
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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###############################################################################

import os.path
import subprocess
import sys
import urllib.request, urllib.error, urllib.parse

this_dir = os.path.dirname(os.path.abspath(__file__))

DOWNLOAD_URL = "http://www.vistrails.org/usersguide/dev/html/VisTrails.pdf"
SAVE_TO = os.path.abspath(sys.argv[1]) if len(sys.argv) > 1 else this_dir

# http://stackoverflow.com/questions/377017/test-if-executable-exists-in-python
def which(program):
    import os
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None

def download_usersguide():
    print("Downloading usersguide from", DOWNLOAD_URL)
    response = urllib.request.urlopen(DOWNLOAD_URL)
    filename = os.path.join(SAVE_TO,
                            DOWNLOAD_URL.split('/')[-1])
    f = open(filename, 'wb')
    f.write(response.read())
    f.close()
    
if __name__ == "__main__":
    if which('sphinx-build') is None:
        print("Sphinx is not installed!")
        download_usersguide()
    elif which('pdflatex') is None:
        print("pdflatex is not installed!")
        download_usersguide()
    else:
        cwd = os.getcwd()
        os.chdir(this_dir)
        # Build usersguide
        proc = subprocess.Popen(['./build_usersguide.py', SAVE_TO],
                                stdin=subprocess.PIPE,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT)
        proc.wait()
        if proc.returncode != 0:
            print("ERROR: building usersguide failed.")
            if proc.stdout:
                print(proc.stdout.readlines())        
            sys.exit(1)
        os.chdir(this_dir)