#!/usr/bin/env python
###########################################################################
# Copyright (c) 2016 Debao Zhang <hello@debao.me>
# All right reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
###########################################################################

"""
Note: This script is designed to run on Windows platform only.

Usage:
    python opencv_prf_generator.py [-q QMAKEPATH] opencvlibpath
"""

import os
import re
import sys
import argparse
import datetime
import shutil
import os.path

def get_input(prompt):
    if sys.hexversion > 0x03000000:
        return input(prompt)
    else:
        return raw_input(prompt)

def is_valid_opencv_inc_path(incpath):
    return incpath and os.path.exists(os.path.join(incpath, 'opencv2/core.hpp'))

def get_libraries_name(libpath, pattern, groupno):
    librarynames = []
    for name in os.listdir(libpath):
        match = pattern.match(name)
        if match:
            librarynames.append(match.group(groupno))
    return librarynames

def get_qmake_dir(path):
    if path.lower().endswith('qmake.exe') and os.path.exists(path):
        return os.path.dirname(path)

    if os.path.isdir(path) and os.path.exists(os.path.join(path, 'qmake.exe')):
        return path

    return None

def get_qmake_dir2():
    pathlist = os.environ['PATH'].split(';')
    for p in pathlist:
        if os.path.exists(os.path.join(p, 'qmake.exe')):
            return p
    return None

def get_feature_dir(qmakedir):
    # should I run qmake to query some paths?
    return os.path.normpath(os.path.join(qmakedir, '../mkspecs/features/'))

def get_fixed_path(path):
    path = path.replace('\\', '/')
    if ' ' in path:
        path = "'{0}'".format(path)
    return path

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Generate and install opencv.prf for Windows user')
    parser.add_argument('opencvlibpath', help="path to opencv's lib directory")
    parser.add_argument('-d', dest='opencvlibpathd', help="path to opencv's debug lib directory")
    parser.add_argument('-i', dest='opencvincpath', help="path to opencv's include directory")
    parser.add_argument('-q', dest='qmakepath', help='the full path of qmake')
    args = parser.parse_args()

    # find a valid includepath
    if args.opencvincpath:
        opencvincpath = os.path.normpath(args.opencvincpath)
        if not is_valid_opencv_inc_path(opencvincpath):
            sys.stderr.write ("Can't find valid INCLUDE directory {0}\n".format(opencvincpath))
            sys.exit(-1)
    else:
        # try to find include path based on lib path
        opencvincpath = os.path.normpath(os.path.join(args.opencvlibpath, '../../../include'))
        if not is_valid_opencv_inc_path(opencvincpath) and args.opencvlibpathd:
            opencvincpath = os.path.normpath(os.path.join(args.opencvlibpathd, '../../../include'))
        if not is_valid_opencv_inc_path(opencvincpath):
            sys.stderr.write ("Can't find valid INCLUDE directory\n")
            sys.exit(-1)

    # find library names (Release Mode)
    opencvlibpath = os.path.normpath(args.opencvlibpath)
    librarynames = get_libraries_name(args.opencvlibpath, re.compile(r'(lib)?(opencv_.*[0-9]{3}(.dll)).(lib|a)'), 2)
    if not librarynames:
        sys.stderr.write ("Invalid LIB path: {0}\n".format(args.opencvlibpath))
        sys.exit(-2)

    # find library names (Debug Mode)
    opencvlibpathd = os.path.normpath(args.opencvlibpathd) if args.opencvlibpathd else opencvlibpath
    librarynamesd = get_libraries_name(opencvlibpathd, re.compile(r'(lib)?(opencv_.*[0-9]{3}d(.dll)).(lib|a)'), 2)
    if not librarynamesd:
        sys.stderr.write ("Invalid LIB path: {0}\n".format(opencvlibpathd))
        sys.exit(-3)

    with open('opencv.prf', 'w') as f:
        f.write("""################################################################################
#
# Automatically generated by {0}
# At {1}
#
################################################################################

""".format(
    sys.argv[0],
    datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S %Z')
    ))

        f.write("INCLUDEPATH += {0}\n".format(get_fixed_path(opencvincpath)))
        if not args.opencvlibpathd:
            # Both debug and release library in the same directory
            f.write("LIBS += -L{0}\n".format(get_fixed_path(opencvlibpath)))

        f.write("CONFIG(debug, debug|release) {\n")
        if args.opencvlibpathd:
            f.write("    LIBS += -L{0}\n".format(get_fixed_path(opencvlibpathd)))
        for name in librarynamesd:
            f.write("    LIBS += -l{0}\n".format(name))
        f.write("} else {\n")
        if args.opencvlibpathd:
            f.write("    LIBS += -L{0}\n".format(get_fixed_path(opencvlibpath)))
        for name in librarynames:
            f.write("    LIBS += -l{0}\n".format(name))
        f.write("}\n")

    print ("OK, opencv.prf has been generated.")

    # find qmake
    installok = False
    qmakedir = get_qmake_dir(args.qmakepath) if args.qmakepath else None
    if qmakedir:
        featurepath = get_feature_dir(qmakedir)
        shutil.copy2('opencv.prf', featurepath)
        installok = True
        print ("OK, opencv.prf has been copied to {0}".format(featurepath))
    else:
        qmakedir = get_qmake_dir2()
        if qmakedir:
            select = get_input("qmake found in {0}, do you want to use this?[y/N]".format(qmakedir))
            if select.lower().startswith('y'):
                featurepath = get_feature_dir(qmakedir)
                shutil.copy2('opencv.prf', featurepath)
                installok = True
                print ("OK, opencv.prf has been copied to {0}".format(featurepath))

    if not installok:
        print ("You should copy opencv.prf to the %QTDIR%/mkspecs/features/ folder.")