#!/usr/bin/env python3

"""
Build all of the packages in a given directory.
"""

import argparse
import json
from pathlib import Path
import shutil


from . import common
from . import buildpkg


def build_package(pkgname, dependencies, packagesdir, outputdir, args):
    reqs = dependencies[pkgname]
    # Make sure all of the package's requirements are built first
    for req in reqs:
        build_package(req, dependencies, packagesdir, outputdir, args)
    if not (packagesdir / pkgname / 'build' / '.packaged').is_file():
        print("BUILDING PACKAGE: " + pkgname)
        buildpkg.build_package(packagesdir / pkgname / 'meta.yaml', args)
    shutil.copyfile(
        packagesdir / pkgname / 'build' / (pkgname + '.data'),
        outputdir / (pkgname + '.data'))
    shutil.copyfile(
        packagesdir / pkgname / 'build' / (pkgname + '.js'),
        outputdir / (pkgname + '.js'))


def build_packages(packagesdir, outputdir, args):
    # We have to build the packages in the correct order (dependencies first),
    # so first load in all of the package metadata and build a dependency map.
    dependencies = {}
    for pkgdir in packagesdir.iterdir():
        pkgpath = pkgdir / 'meta.yaml'
        if pkgdir.is_dir() and pkgpath.is_file():
            pkg = common.parse_package(pkgpath)
            name = pkg['package']['name']
            reqs = pkg.get('requirements', {}).get('run', [])
            dependencies[name] = reqs

    for pkgname in dependencies.keys():
        build_package(pkgname, dependencies, packagesdir, outputdir, args)

    # The "test" package is built in a different way, so we hardcode its
    # existence here.
    dependencies['test'] = []

    # This is done last so the Makefile can use it as a completion token.
    with open(outputdir / 'packages.json', 'w') as fd:
        json.dump({'dependencies': dependencies}, fd)


def make_parser(parser):
    parser.description = "Build all of the packages in a given directory"
    parser.add_argument(
        'dir', type=str, nargs=1,
        help='Input directory containing a tree of package definitions')
    parser.add_argument(
        'output', type=str, nargs=1,
        help='Output directory in which to put all built packages')
    parser.add_argument(
        '--cflags', type=str, nargs='?', default=common.DEFAULTCFLAGS,
        help='Extra compiling flags')
    parser.add_argument(
        '--ldflags', type=str, nargs='?', default=common.DEFAULTLDFLAGS,
        help='Extra linking flags')
    parser.add_argument(
        '--host', type=str, nargs='?', default=common.HOSTPYTHON,
        help='The path to the host Python installation')
    parser.add_argument(
        '--target', type=str, nargs='?', default=common.TARGETPYTHON,
        help='The path to the target Python installation')
    return parser


def main(args):
    packagesdir = Path(args.dir[0]).resolve()
    outputdir = Path(args.output[0]).resolve()
    build_packages(packagesdir, outputdir, args)


if __name__ == '__main__':
    parser = make_parser(argparse.ArgumentParser())
    args = parser.parse_args()
    main(args)