#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Sphinx extension to generate ReSTructured Text .inc snippets
# with version-based content for this IDF version

from __future__ import print_function, unicode_literals

import os
import re
import subprocess
from io import open

from .util import copy_if_modified

TEMPLATES = {
    'en': {
        'git-clone-bash': """
.. code-block:: bash

    mkdir -p ~/esp
    cd ~/esp
    git clone %(clone_args)s--recursive https://github.com/espressif/esp-idf.git
        """,

        'git-clone-windows': """
.. code-block:: batch

    mkdir %%userprofile%%\\esp
    cd %%userprofile%%\\esp
    git clone %(clone_args)s--recursive https://github.com/espressif/esp-idf.git
            """,

        'git-clone-notes': {
            'template': """
.. note::

    %(extra_note)s

.. note::

    %(zipfile_note)s
""",
            'master': 'This command will clone the master branch, which has the latest development ("bleeding edge") '
            'version of ESP-IDF. It is fully functional and updated on weekly basis with the most recent features and bugfixes.',
            'branch': 'The ``git clone`` option ``-b %(clone_arg)s`` tells git to clone the %(ver_type)s in the ESP-IDF repository ``git clone`` '
            'corresponding to this version of the documentation.',
            'zipfile': {
                'stable': 'As a fallback, it is also possible to download a zip file of this stable release from the `Releases page`_. '
                          'Do not download the "Source code" zip file(s) generated automatically by GitHub, they do not work with ESP-IDF.',
                'unstable': 'GitHub\'s "Download zip file" feature does not work with ESP-IDF, a ``git clone`` is required. As a fallback, '
                            '`Stable version`_ can be installed without Git.'
            },  # zipfile
        },  # git-clone-notes
        'version-note': {
            'master': """
.. note::
     This is documentation for the master branch (latest version) of ESP-IDF. This version is under continual development.
     `Stable version`_ documentation is available, as well as other :doc:`/versions`.
""",
            'stable': """
.. note::
     This is documentation for stable version %s of ESP-IDF. Other :doc:`/versions` are also available.
""",
            'branch': """
.. note::
     This is documentation for %s ``%s`` of ESP-IDF. Other :doc:`/versions` are also available.
"""
        },  # version-note
    },  # en
    'zh_CN': {
        'git-clone-bash': """
.. code-block:: bash

    mkdir -p ~/esp
    cd ~/esp
    git clone %(clone_args)s--recursive https://github.com/espressif/esp-idf.git
            """,

        'git-clone-windows': """
.. code-block:: batch

    mkdir %%userprofile%%\\esp
    cd %%userprofile%%\\esp
    git clone %(clone_args)s--recursive https://github.com/espressif/esp-idf.git
        """,

        'git-clone-notes': {
            'template': """
.. note::

    %(extra_note)s

.. note::

    %(zipfile_note)s
""",
            'master': '此命令将克隆 master 分支，该分支保存着 ESP-IDF 的最新版本，它功能齐全，每周都会更新一些新功能并修正一些错误。',
            'branch': '``git clone`` 命令的 ``-b %(clone_arg)s`` 选项告诉 git 从 ESP-IDF 仓库中克隆与此版本的文档对应的分支。',
            'zipfile': {
                'stable': '作为备份，还可以从 `Releases page`_ 下载此稳定版本的 zip 文件。不要下载由 GitHub 自动生成的"源代码"的 zip 文件，它们不适用于 ESP-IDF。',
                'unstable': 'GitHub 中"下载 zip 文档"的功能不适用于 ESP-IDF，所以需要使用 ``git clone`` 命令。作为备份，可以在没有安装 Git 的环境中下载 '
                            '`Stable version`_ 的 zip 归档文件。'
            },  # zipfile
        },  # git-clone
        'version-note': {
            'master': """
.. note::
     这是ESP-IDF master 分支（最新版本）的文档，该版本在持续开发中。还有 `Stable version`_ 的文档，以及其他版本的文档 :doc:`/versions` 供参考。
""",
            'stable': """
.. note::
     这是ESP-IDF 稳定版本 %s 的文档，还有其他版本的文档 :doc:`/versions` 供参考。
""",
            'branch': """
.. note::
     这是ESP-IDF %s ``%s`` 版本的文档，还有其他版本的文档 :doc:`/versions` 供参考。
"""
        },  # version-note
    }  # zh_CN
}


def setup(app):
    # doesn't need to be this event specifically, but this is roughly the right time
    app.connect('idf-info', generate_version_specific_includes)
    return {'parallel_read_safe': True, 'parallel_write_safe': True, 'version': '0.1'}


def generate_version_specific_includes(app, project_description):
    language = app.config.language
    tmp_out_dir = os.path.join(app.config.build_dir, 'version_inc')
    if not os.path.exists(tmp_out_dir):
        print('Creating directory %s' % tmp_out_dir)
        os.mkdir(tmp_out_dir)

    template = TEMPLATES[language]

    version, ver_type, is_stable = get_version()

    write_git_clone_inc_files(template, tmp_out_dir, version, ver_type, is_stable)
    write_version_note(template['version-note'], tmp_out_dir, version, ver_type, is_stable)
    copy_if_modified(tmp_out_dir, os.path.join(app.config.build_dir, 'inc'))
    print('Done')


def write_git_clone_inc_files(templates, out_dir, version, ver_type, is_stable):
    def out_file(basename):
            p = os.path.join(out_dir, '%s.inc' % basename)
            print('Writing %s...' % p)
            return p

    if version == 'master':
        clone_args = ''
    else:
        clone_args = '-b %s ' % version

    with open(out_file('git-clone-bash'), 'w', encoding='utf-8') as f:
        f.write(templates['git-clone-bash'] % locals())

    with open(out_file('git-clone-windows'), 'w', encoding='utf-8') as f:
        f.write(templates['git-clone-windows'] % locals())

    with open(out_file('git-clone-notes'), 'w', encoding='utf-8') as f:
        template = templates['git-clone-notes']

        zipfile = template['zipfile']

        if version == 'master':
            extra_note = template['master']
            zipfile_note = zipfile['unstable']
        else:
            extra_note = template['branch'] % {'clone_arg': version, 'ver_type': ver_type}
            zipfile_note = zipfile['stable'] if is_stable else zipfile['unstable']

        f.write(template['template'] % locals())

    print('Wrote git-clone-xxx.inc files')


def write_version_note(template, out_dir, version, ver_type, is_stable):
    if version == 'master':
        content = template['master']
    elif ver_type == 'tag' and is_stable:
        content = template['stable'] % version
    else:
        content = template['branch'] % (ver_type, version)
    out_file = os.path.join(out_dir, 'version-note.inc')
    with open(out_file, 'w', encoding='utf-8') as f:
        f.write(content)
    print('%s written' % out_file)


def get_version():
    """
    Returns a tuple of (name of branch/tag/commit-id, type branch/tag/commit, is_stable)
    """
    # Use git to look for a tag
    try:
        tag = subprocess.check_output(['git', 'describe', '--exact-match']).strip().decode('utf-8')
        is_stable = re.match(r'v[0-9\.]+$', tag) is not None
        return (tag, 'tag', is_stable)
    except subprocess.CalledProcessError:
        pass

    # No tag, look at branch name from CI, this will give the correct branch name even if the ref for the branch we
    # merge into has moved forward before the pipeline runs
    branch = os.environ.get('CI_COMMIT_REF_NAME', None)
    if branch is not None:
        return (branch, 'branch', False)

    # Try to find the branch name even if docs are built locally
    branch = subprocess.check_output(['git', 'rev-parse', '--abbrev-ref', 'HEAD']).strip().decode('utf-8')
    if branch != 'HEAD':
        return (branch, 'branch', False)

    # As a last resort we return commit SHA-1, should never happen in CI/docs that should be published
    return (subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']).strip().decode('utf-8'), 'commit', False)