#!/usr/bin/env python3
# Note: Do not embed any non-ASCII characters in this file until pip has been
# fixed. See https://github.com/xonsh/xonsh/issues/487.
import os
import subprocess
import sys

from setuptools import setup
from setuptools.command.build_py import build_py
from setuptools.command.develop import develop
from setuptools.command.install import install
from setuptools.command.install_scripts import install_scripts
from setuptools.command.sdist import sdist
from wheel.bdist_wheel import bdist_wheel

TABLES = [
    "xonsh/lexer_table.py",
    "xonsh/parser_table.py",
    "xonsh/completion_parser_table.py",
]


def python_tag():
    ver = sys.version_info
    return f"py{ver.major}{ver.minor}"


def clean_tables():
    """Remove the lexer/parser modules that are dynamically created."""
    for f in TABLES:
        if os.path.isfile(f):
            os.remove(f)
            print("Removed " + f)


os.environ["XONSH_DEBUG"] = "1"


def build_tables():
    """Build the lexer/parser modules."""
    print("Building lexer and parser tables.", file=sys.stderr)
    root_dir = os.path.abspath(os.path.dirname(__file__))
    sys.path.insert(0, root_dir)
    from xonsh.parser import Parser
    from xonsh.parsers.completion_context import CompletionContextParser

    Parser(
        yacc_table="parser_table",
        outputdir=os.path.join(root_dir, "xonsh"),
        yacc_debug=True,
    )
    CompletionContextParser(
        yacc_table="completion_parser_table",
        outputdir=os.path.join(root_dir, "xonsh"),
        debug=True,
    )
    sys.path.pop(0)


def dirty_version():
    """
    If install/sdist is run from a git directory (not a conda install), add
    a devN suffix to reported version number and write a gitignored file
    that holds the git hash of the current state of the repo to be queried
    by ``xonfig``
    """
    try:
        _version = subprocess.check_output(["git", "describe", "--tags"])
    except Exception:
        print("failed to find git tags", file=sys.stderr)
        return False
    _version = _version.decode("ascii")
    try:
        _, N, sha = _version.strip().split("-")
    except ValueError:  # tag name may contain "-"
        print("failed to parse git version", file=sys.stderr)
        return False
    sha = sha.strip("g")
    replace_version(N)
    _cmd = ["git", "show", "-s", "--format=%cd", "--date=local", sha]
    try:
        _date = subprocess.check_output(_cmd)
        _date = _date.decode("ascii")
        # remove weekday name for a shorter string
        _date = " ".join(_date.split()[1:])
    except Exception:
        _date = ""
        print("failed to get commit date", file=sys.stderr)
    with open("xonsh/dev.githash", "w") as f:
        f.write(f"{sha}|{_date}")
    print("wrote git version: " + sha, file=sys.stderr)
    return True


ORIGINAL_VERSION_LINE = None


def replace_version(N):
    """Replace version in `__init__.py` with devN suffix"""
    global ORIGINAL_VERSION_LINE
    with open("xonsh/__init__.py") as f:
        raw = f.read()
    lines = raw.splitlines()
    msg_assert = "__version__ must be the first line of the __init__.py"
    assert "__version__" in lines[0], msg_assert
    ORIGINAL_VERSION_LINE = lines[0]
    lines[0] = lines[0].rstrip(' "') + f'.dev{N}"'
    upd = "\n".join(lines) + "\n"
    with open("xonsh/__init__.py", "w") as f:
        f.write(upd)


def restore_version():
    """If we touch the version in __init__.py discard changes after install."""
    if ORIGINAL_VERSION_LINE is None:
        return
    with open("xonsh/__init__.py") as f:
        raw = f.read()
    lines = raw.splitlines()
    lines[0] = ORIGINAL_VERSION_LINE
    upd = "\n".join(lines) + "\n"
    with open("xonsh/__init__.py", "w") as f:
        f.write(upd)


class xbuild_py(build_py):
    """Xonsh specialization of setuptools build_py class."""

    def run(self):
        clean_tables()
        build_tables()
        # add dirty version number
        dirty = dirty_version()
        super().run()
        if dirty:
            restore_version()


class xbdist(bdist_wheel):
    def initialize_options(self):
        super().initialize_options()
        # because XonshParser will be build for each minor python version, we need separate builds
        self.python_tag = python_tag()


class xinstall(install):
    """Xonsh specialization of setuptools install class.
    For production, let setuptools generate the
    startup script, e.g: `pip installl .' rather than
    relying on 'python setup.py install'."""

    def run(self):
        clean_tables()
        build_tables()
        # add dirty version number
        dirty = dirty_version()

        super().run()
        if dirty:
            restore_version()


class xsdist(sdist):
    """Xonsh specialization of setuptools sdist class."""

    def make_release_tree(self, basedir, files):
        clean_tables()
        build_tables()
        dirty = dirty_version()
        files.extend(TABLES)
        super().make_release_tree(basedir, files)
        if dirty:
            restore_version()


# Hack to overcome pip/setuptools problem on Win 10.  See:
#   https://github.com/tomduck/pandoc-eqnos/issues/6
#   https://github.com/pypa/pip/issues/2783

# Custom install_scripts command class for setup()
class install_scripts_quoted_shebang(install_scripts):
    """Ensure there are quotes around shebang paths with spaces."""

    def write_script(self, script_name, contents, mode="t", *ignored):
        shebang = str(contents.splitlines()[0])
        if (
            shebang.startswith("#!")
            and " " in shebang[2:].strip()
            and '"' not in shebang
        ):
            quoted_shebang = '#!"%s"' % shebang[2:].strip()
            contents = contents.replace(shebang, quoted_shebang)
        super().write_script(script_name, contents, mode, *ignored)


class install_scripts_rewrite(install_scripts):
    """Change default python3 to the concrete python binary used to install/develop inside xon.sh script"""

    def run(self):
        super().run()
        if not self.dry_run:
            for file in self.get_outputs():
                if file.endswith("xon.sh"):
                    # this is the value distutils use on its shebang translation
                    bs_cmd = self.get_finalized_command("build_scripts")
                    exec_param = getattr(bs_cmd, "executable", None)

                    with open(file) as f:
                        content = f.read()

                    processed = content.replace(" python3 ", f' "{exec_param}" ')

                    with open(file, "w") as f:
                        f.write(processed)


class xdevelop(develop):
    """Xonsh specialization of setuptools develop class."""

    def run(self):
        clean_tables()
        build_tables()
        dirty = dirty_version()
        develop.run(self)
        if dirty:
            restore_version()

    def install_script(self, dist, script_name, script_text, dev_path=None):
        if script_name == "xon.sh":
            # change default python3 to the concrete python binary used to install/develop inside xon.sh script
            script_text = script_text.replace(" python3 ", f' "{sys.executable}" ')
        super().install_script(dist, script_name, script_text, dev_path)


# The custom install needs to be used on Windows machines
cmdclass = {
    "install": xinstall,
    "sdist": xsdist,
    "build_py": xbuild_py,
    "develop": xdevelop,
    "bdist_wheel": xbdist,
}
if os.name == "nt":
    cmdclass["install_scripts"] = install_scripts_quoted_shebang
else:
    cmdclass["install_scripts"] = install_scripts_rewrite


def main():
    """The main entry point."""
    setup(
        cmdclass=cmdclass,
    )


if __name__ == "__main__":
    main()
