# -*- coding: utf-8 -*-
#
# Copyright © 2013 Pierre Raybaut
# Licensed under the terms of the MIT License
# (see winpython/__init__.py for details)

"""
WinPython diff script

Created on Tue Jan 29 11:56:54 2013
"""

from __future__ import print_function, with_statement

import os
import os.path as osp
import re
import shutil

# Local imports
from winpython import utils

# pep503 defines normalized package names: www.python.org/dev/peps/pep-0503
def normalize(name):
    return re.sub(r"[-_.]+", "-", name).lower()

CHANGELOGS_DIR = osp.join(
    osp.dirname(__file__), 'changelogs'
)
assert osp.isdir(CHANGELOGS_DIR)


class Package(object):
    # SourceForge Wiki syntax:
    PATTERN = r'\[([a-zA-Z\-\:\/\.\_0-9]*)\]\(([^\]\ ]*)\) \| ([^\|]*) \| ([^\|]*)'
    # Google Code Wiki syntax:
    PATTERN_OLD = r'\[([a-zA-Z\-\:\/\.\_0-9]*) ([^\]\ ]*)\] \| ([^\|]*) \| ([^\|]*)'

    def __init__(self):
        self.name = None
        self.version = None
        self.description = None
        self.url = None

    def __str__(self):
        text = "%s %s" % (self.name, self.version)
        text += "\r\n%s\r\nWebsite: %s" % (
            self.description,
            self.url,
        )
        return text

    def from_text(self, text):
        try:
            self.url, self.name, self.version, self.description = re.match(
                self.PATTERN_OLD, text
            ).groups()
        except AttributeError:
            self.name, self.url, self.version, self.description = re.match(
                self.PATTERN, text
            ).groups()

    def to_wiki(self):
        return "  * [%s](%s) %s (%s)\r\n" % (
            self.name,
            self.url,
            self.version,
            self.description,
        )

    def upgrade_wiki(self, other):
        # wheel replace '-' per '_' in package name
        assert (
            self.name.replace('-', '_').lower()
            == other.name.replace('-', '_').lower()
        )
        return "  * [%s](%s) %s → %s (%s)\r\n" % (
            self.name,
            self.url,
            other.version,
            self.version,
            self.description,
        )


class PackageIndex(object):
    WINPYTHON_PATTERN = (
        r'\#\# WinPython\-*[0-9b-t]* ([0-9\.a-zA-Z]*)'
    )
    TOOLS_LINE = '### Tools'
    PYTHON_PACKAGES_LINE = '### Python packages'
    HEADER_LINE1 = 'Name | Version | Description'
    HEADER_LINE2 = '-----|---------|------------'

    def __init__(
        self,
        version,
        basedir=None,
        flavor='',
        architecture=64,
    ):
        self.version = version
        self.other_packages = {}
        self.python_packages = {}
        self.flavor = flavor
        self.basedir = basedir
        self.architecture = architecture
        self.from_file(basedir)

    def from_file(self, basedir):
        # fname = osp.join(basedir, 'build%s' % self.flavor,
        fname = osp.join(
            CHANGELOGS_DIR,
            'WinPython%s-%sbit-%s.md'
            % (
                self.flavor,
                self.architecture,
                self.version,
            ),
        )
        with open(
            fname, 'r'
        ) as fdesc:  # python3 doesn't like 'rb'
            text = fdesc.read()
        self.from_text(text)

    def from_text(self, text):
        version = re.match(
            self.WINPYTHON_PATTERN + self.flavor, text
        ).groups()[0]
        assert version == self.version
        tools_flag = False
        python_flag = False
        for line in text.splitlines():
            if line:
                if line == self.TOOLS_LINE:
                    tools_flag = True
                    continue
                elif line == self.PYTHON_PACKAGES_LINE:
                    tools_flag = False
                    python_flag = True
                    continue
                elif line in (
                    self.HEADER_LINE1,
                    self.HEADER_LINE2,
                ):
                    continue
                if tools_flag or python_flag:
                    package = Package()
                    package.from_text(line)
                    if tools_flag:
                        self.other_packages[
                            package.name
                        ] = package
                    else:
                        self.python_packages[
                            package.name
                        ] = package


def diff_package_dicts(dict1_in, dict2_in):
    """Return difference between package dict1 and package dict2"""
    text = ""
    # wheel replace '-' per '_' in key
    dict1 = {}
    dict2 = {}
    for key in dict1_in:
        dict1[key.replace('-', '_').lower()] = dict1_in[key]
    for key in dict2_in:
        dict2[key.replace('-', '_').lower()] = dict2_in[key]
    set1, set2 = set(dict1.keys()), set(dict2.keys())
    # New packages
    new = sorted(set2 - set1)
    if new:
        text += "New packages:\r\n\r\n"
        for name in new:
            package = dict2[name]
            text += package.to_wiki()
        text += '\r\n'
    # Upgraded packages
    upgraded_list = []
    for name in sorted(set1 & set2):
        package1 = dict1[name]
        package2 = dict2[name]
        if package1.version != package2.version:
            upgraded_list.append(
                package2.upgrade_wiki(package1)
            )
    if upgraded_list:
        text += (
            "Upgraded packages:\r\n\r\n%s\r\n"
            % "".join(upgraded_list)
        )
    # Removed packages
    removed = sorted(set1 - set2)
    if removed:
        text += "Removed packages:\r\n\r\n"
        for name in removed:
            package = dict1[name]
            text += package.to_wiki()
        text += '\r\n'
    return text


def find_closer_version(
    version1, basedir=None, flavor='', architecture=64
):
    """Find version which is the closest to `version`"""
    builddir = osp.join(basedir, 'bu%s' % flavor)
    func = lambda name: re.match(
        r'WinPython%s-%sbit-([0-9\.]*)\.(txt|md)'
        % (flavor, architecture),
        name,
    )
    versions = [
        func(name).groups()[0]
        for name in os.listdir(builddir)
        if func(name)
    ]
    try:
        index = versions.index(version1)
    except ValueError:
        raise ValueError("Unknown version %s" % version1)
    if index == 0:
        print("No version prior to %s" % version1)
        index += 1  # we don't want to fail on this
    return versions[index - 1]


def compare_package_indexes(
    version2,
    version1=None,
    basedir=None,
    flavor='',
    flavor1=None,
    architecture=64,
):
    """Compare two package index Wiki pages"""
    if version1 is None:
        version1 = find_closer_version(
            version2,
            basedir=basedir,
            flavor=flavor,
            architecture=architecture,
        )
    flavor1 = flavor1 if flavor1 is not None else flavor
    text = '\r\n'.join(
        [
            "## History of changes for WinPython-%sbit %s"
            % (architecture, version2 + flavor),
            "",
            "The following changes were made to WinPython-%sbit"
            " distribution since version %s."
            % (architecture, version1 + flavor1),
            "",
            "",
        ]
    )
    pi1 = PackageIndex(
        version1,
        basedir=basedir,
        flavor=flavor1,
        architecture=architecture,
    )
    pi2 = PackageIndex(
        version2,
        basedir=basedir,
        flavor=flavor,
        architecture=architecture,
    )
    tools_text = diff_package_dicts(
        pi1.other_packages, pi2.other_packages
    )
    if tools_text:
        text += (
            PackageIndex.TOOLS_LINE
            + '\r\n\r\n'
            + tools_text
        )
    py_text = diff_package_dicts(
        pi1.python_packages, pi2.python_packages
    )
    if py_text:
        text += (
            PackageIndex.PYTHON_PACKAGES_LINE
            + '\r\n\r\n'
            + py_text
        )
    text += '* * *\r\n'
    return text


def _copy_all_changelogs(
    version, basedir, flavor='', architecture=64
):
    basever = '.'.join(version.split('.')[:2])
    for name in os.listdir(CHANGELOGS_DIR):
        if re.match(
            r'WinPython%s-%sbit-%s([0-9\.]*)\.(txt|md)'
            % (flavor, architecture, basever),
            name,
        ):
            shutil.copyfile(
                osp.join(CHANGELOGS_DIR, name),
                osp.join(basedir, 'bu%s' % flavor, name),
            )


def write_changelog(
    version2,
    version1=None,
    basedir=None,
    flavor='',
    release_level='',
    architecture=64,
):
    """Write changelog between version1 and version2 of WinPython"""
    _copy_all_changelogs(
        version2,
        basedir,
        flavor=flavor,
        architecture=architecture,
    )
    print(
        'comparing_package_indexes',
        version2,
        basedir,
        flavor,
        architecture,
    )
    text = compare_package_indexes(
        version2,
        version1,
        basedir=basedir,
        flavor=flavor,
        architecture=architecture,
    )
    fname = osp.join(
        basedir,
        'bu%s' % flavor,
        'WinPython%s-%sbit-%s_History.md'
        % (flavor, architecture, version2),
    )
    with open(
        fname, 'w', encoding='utf-8-sig'
    ) as fdesc:  # python 3 need
        fdesc.write(text)
    # Copy to winpython/changelogs
    shutil.copyfile(
        fname, osp.join(CHANGELOGS_DIR, osp.basename(fname))
    )


def test_parse_package_index_wiki(
    version, basedir=None, flavor='', architecture=64
):
    """Parse the package index Wiki page"""
    pi = PackageIndex(
        version,
        basedir=basedir,
        flavor=flavor,
        architecture=architecture,
    )
    utils.print_box("WinPython %s:" % pi.version)
    utils.print_box("Tools:")
    for package in pi.other_packages.values():
        print(package)
        print('')
    utils.print_box("Python packages:")
    for package in pi.python_packages.values():
        print(package)
        print('')


def test_compare(
    basedir, version2, version1, architecture=64
):
    print(
        compare_package_indexes(
            basedir,
            version2,
            version1,
            architecture=architecture,
        )
    )


if __name__ == '__main__':
    print(
        compare_package_indexes(
            version2='3.7.4.0',
            version1='3.7.2.0',
            basedir=r'C:\WinP\bd37',
            flavor='Zero',
            flavor1='Zero',
            architecture=32
        ))
    write_changelog(
            version2='3.7.4.0',
            version1='3.7.2.0',
            basedir=r'C:\WinP\bd37',
            flavor='Ps2',
            architecture=64
            )
    # test_parse_package_index_wiki('2.7.3.3')
    # print(compare_package_indexes('2.7.3.3', '2.7.3.1'))
    # write_changelog('2.7.4.1', '2.7.4.0')
    # write_changelog('3.3.0.0beta2', '3.3.0.0beta1')