#!/usr/bin/env python
# coding: utf-8
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# Copyright (c) 2015-2017 European Synchrotron Radiation Facility
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"""Provides the version number for packaging purposes.

IMPORTANT: In the fisx project, the unique place to change the
MAJOR, MINOR and MICRO numbers is **src/fisx_version.h**.

In the current file, you can adjust RELEV, when is necessary to release a
dev, alpha, beta, gamma or a rc version.

provides:
* version = "1.2.3" or "1.2.3-beta4"
* version_info = named tuple (1,2,3,"beta",4)
* hexversion: 0x010203B4
* strictversion = "1.2.3b4
* debianversion = "1.2.3~beta4"
* calc_hexversion: the function to transform a version_tuple into an integer

This is called hexversion since it only really looks meaningful when viewed as the
result of passing it to the built-in hex() function.
The version_info value may be used for a more human-friendly encoding of the same information.

The hexversion is a 32-bit number with the following layout:
Bits (big endian order)     Meaning
1-8     PY_MAJOR_VERSION (the 2 in 2.1.0a3)
9-16     PY_MINOR_VERSION (the 1 in 2.1.0a3)
17-24     PY_MICRO_VERSION (the 0 in 2.1.0a3)
25-28     PY_RELEASE_LEVEL (0xA for alpha, 0xB for beta, 0xC for release candidate and 0xF for final)
29-32     PY_RELEASE_SERIAL (the 3 in 2.1.0a3, zero for final releases)

Thus 2.1.0a3 is hexversion 0x020100a3.

"""

from __future__ import absolute_import, print_function, division
import os
from collections import namedtuple


__authors__ = ["Jérôme Kieffer"]
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "27/10/2017"
__status__ = "production"
__docformat__ = 'restructuredtext'
__all__ = ["date", "version_info", "strictversion", "hexversion", "debianversion",
           "calc_hexversion", "citation"]


_version_info = namedtuple("version_info", ["major", "minor", "micro", "releaselevel", "serial"])

RELEASE_LEVEL_VALUE = {"dev": 0,
                       "alpha": 10,
                       "beta": 11,
                       "gamma": 12,
                       "rc": 13,
                       "final": 15}


def get_fisx_version_str():
    """Get the version string (e.g. "1.2.3")"""
    cppDir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "src")
    f = open(os.path.join(cppDir, "fisx_version.h"), "r")
    content = f.readlines()
    f.close()
    for line in content:
        if "FISX_VERSION_STR" in line:
            version = line.split("FISX_VERSION_STR")[-1].replace("\n","")
            version = version.replace(" ", "")
            return version[1:-1]


MAJOR, MINOR, MICRO = list(map(int, get_fisx_version_str().split(".")))
RELEV = "final"  # <16
SERIAL = 0  # <16


version_info = _version_info(MAJOR, MINOR, MICRO, RELEV, SERIAL)

strictversion = version = debianversion = "%d.%d.%d" % version_info[:3]
if version_info.releaselevel != "final":
    version += "-%s%s" % version_info[-2:]
    debianversion += "~adev%i" % version_info[-1] if RELEV == "dev" else "~%s%i" % version_info[-2:]
    prerel = "a" if RELEASE_LEVEL_VALUE.get(version_info[3], 0) < 10 else "b"
    if prerel not in "ab":
        prerel = "a"
    strictversion += prerel + str(version_info[-1])


def calc_hexversion(major=0, minor=0, micro=0, releaselevel="dev", serial=0):
    """Calculate the hexadecimal version number from the tuple version_info:

    :param major: integer
    :param minor: integer
    :param micro: integer
    :param relev: integer or string
    :param serial: integer
    :return: integer always increasing with revision numbers
    """
    try:
        releaselevel = int(releaselevel)
    except ValueError:
        releaselevel = RELEASE_LEVEL_VALUE.get(releaselevel, 0)

    hex_version = int(serial)
    hex_version |= releaselevel * 1 << 4
    hex_version |= int(micro) * 1 << 8
    hex_version |= int(minor) * 1 << 16
    hex_version |= int(major) * 1 << 24
    return hex_version


hexversion = calc_hexversion(*version_info)

if __name__ == "__main__":
    print(version)
