#!/usr/bin/env python3
"""Script for generating the Makefiles."""

import argparse
import os
import sys
import shutil
import subprocess


PROJECTNAME = "GStreamer 'all'"

ROOTDIR = os.path.abspath(os.path.dirname(__file__))
MAKEFILE_TMPL = """all:
%(tab)scd %(build_dir)s && %(ninja)s -k 100; %(ninja)s

install:
%(tab)scd %(build_dir)s && DESTDIR="${DESTDIR}" %(ninja)s install

check:
%(tab)scd %(build_dir)s && %(ninja)s test

uninstalled:
%(tab)scd %(build_dir)s && %(ninja)s uninstalled

clean:
%(tab)srm -Rf %(build_dir)s
%(tab)srm Makefile
"""


def accept_command(commands):
    """Checks if @command --version works."""
    for command in commands:
        try:
            subprocess.check_output([command, "--version"])
            return command
        except FileNotFoundError:
            pass

    return None


def get_configs(meson):
     meson_version = subprocess.check_output([meson, '--version']).decode().strip()
     if meson_version <= '0.33.0':
         print("Disabling the introspection as support for the introspection with subproject was introduced in 0.34")
         return ['-Dgstreamer:disable_introspection=true',
                 '-Dgst-editing-services:disable_introspection=true',
                 '-Dgst-devtools:disable_introspection=true']

     return ['-Dwerror=true']


def configure_meson(args):
    """Configures meson and generate the Makefile."""
    meson = accept_command(["meson", "meson.py"])
    if not meson:
        print("Install mesonbuild to build %s: http://mesonbuild.com/\n"
              "You can simply install it with:\n"
              "    $ sudo pip3 install meson" % PROJECTNAME)
        exit(1)

    ninja = accept_command(["ninja", "ninja-build"])
    if not ninja:
        print("Install ninja-build to build %s: https://ninja-build.org/"
              % PROJECTNAME)
        exit(1)

    build_dir = os.path.join(ROOTDIR, "build")
    shutil.rmtree(build_dir, True)
    os.mkdir(build_dir)
    os.chdir(build_dir)

    try:
        subprocess.check_call([meson, "../"] + args + get_configs(meson))
    except subprocess.CalledProcessError as e:
        print("EXIT meson return %s" % e.returncode)
        exit(1)

    with open(os.path.join(ROOTDIR, "Makefile"), "w") as makefile:
        makefile.write(MAKEFILE_TMPL %
                       {"build_dir": build_dir,
                        "ninja": ninja,
                        "tab": "	"})

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Process some integers.')
    parser.add_argument("--no-reconfigure", action='store_true',
                        default=False, help='Avoid removing the build dir'
                       ' if not necessary.')
    options, args = parser.parse_known_args()
    if options.no_reconfigure:
        if os.path.exists(
                ROOTDIR + "/build/build.ninja") and os.path.exists(
                    ROOTDIR + "/Makefile"):
            print("Not reconfiguring")
            exit(0)

    configure_meson(args)