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

import argparse
import os
import sys
import shutil
import subprocess

from common import git
from common import Colors


PROJECTNAME = "GStreamer 'all'"

ROOTDIR = os.path.abspath(os.path.dirname(__file__))


def get_meson(update_meson):
    meson = os.path.join(ROOTDIR, 'meson', 'meson.py')
    if update_meson or not os.path.exists(meson):
        print("Updating meson submodule... ", end='')
        sys.stdout.flush()
        git('submodule', 'update', '--init', repository_path=ROOTDIR)
        print("DONE")

    return meson


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):
     return ['-D', 'werror=true']


def configure_meson(args, options):
    """Configures meson and generate the Makefile."""
    meson = get_meson(options.update_meson)
    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)

    try:
        subprocess.check_call([sys.executable, meson, "../"] + args, cwd=build_dir)
        subprocess.check_call([sys.executable, os.path.join(ROOTDIR, 'meson', 'mesonconf.py')]
                              + get_configs(meson), cwd=build_dir)
    except subprocess.CalledProcessError as e:
        print("EXIT meson return %s" % e.returncode)
        exit(1)


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.')
    parser.add_argument("-u", "--update-meson", action='store_true',
                        default=False, help='Do not update meson')
    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, options)