#!/usr/bin/env python
# Copyright (c) 2019-present, Facebook, Inc.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree. An additional grant
# of patent rights can be found in the PATENTS file in the same directory.


from __future__ import absolute_import, division, print_function, unicode_literals

import argparse
import os
import shutil
import subprocess
import sys

from getdeps.buildopts import setup_build_options
from getdeps.load import load_project, manifests_in_dependency_order
from getdeps.manifest import ManifestParser
from getdeps.platform import HostType, context_from_host_tuple
from getdeps.subcmd import SubCmd, add_subcommands, cmd


try:
    import getdeps.facebook  # noqa: F401
except ImportError:
    # we don't ship the facebook specific subdir,
    # so allow that to fail silently
    pass


sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "getdeps"))


@cmd("validate-manifest", "parse a manifest and validate that it is correct")
class ValidateManifest(SubCmd):
    def run(self, args):
        try:
            ManifestParser(file_name=args.file_name)
            print("OK", file=sys.stderr)
            return 0
        except Exception as exc:
            print("ERROR: %s" % str(exc), file=sys.stderr)
            return 1

    def setup_parser(self, parser):
        parser.add_argument("file_name", help="path to the manifest file")


@cmd("show-host-type", "outputs the host type tuple for the host machine")
class ShowHostType(SubCmd):
    def run(self, args):
        host = HostType()
        print("%s" % host.as_tuple_string())
        return 0


@cmd("fetch", "fetch the code for a given project")
class FetchCmd(SubCmd):
    def setup_parser(self, parser):
        parser.add_argument(
            "project",
            help=(
                "name of the project or path to a manifest "
                "file describing the project"
            ),
        )
        parser.add_argument(
            "--recursive",
            help="fetch the transitive deps also",
            action="store_true",
            default=False,
        )
        parser.add_argument(
            "--host-type",
            help=(
                "When recursively fetching, fetch deps for "
                "this host type rather than the current system"
            ),
        )

    def run(self, args):
        opts = setup_build_options(args)
        manifest = load_project(opts, args.project)
        ctx = context_from_host_tuple(args.host_type)
        if args.recursive:
            projects = manifests_in_dependency_order(opts, manifest, ctx)
        else:
            projects = [manifest]
        for m in projects:
            fetcher = m.create_fetcher(opts, ctx)
            fetcher.update()


@cmd("list-deps", "lists the transitive deps for a given project")
class ListDepsCmd(SubCmd):
    def run(self, args):
        opts = setup_build_options(args)
        manifest = load_project(opts, args.project)
        ctx = context_from_host_tuple(args.host_type)
        for m in manifests_in_dependency_order(opts, manifest, ctx):
            print(m.name)
        return 0

    def setup_parser(self, parser):
        parser.add_argument(
            "--host-type",
            help=(
                "Produce the list for the specified host type, "
                "rather than that of the current system"
            ),
        )
        parser.add_argument(
            "project",
            help=(
                "name of the project or path to a manifest "
                "file describing the project"
            ),
        )


def clean_dirs(opts):
    for d in ["build", "installed", "extracted", "shipit"]:
        d = os.path.join(opts.scratch_dir, d)
        print("Cleaning %s..." % d)
        if os.path.exists(d):
            shutil.rmtree(d)


@cmd("clean", "clean up the scratch dir")
class CleanCmd(SubCmd):
    def run(self, args):
        opts = setup_build_options(args)
        clean_dirs(opts)


@cmd("build", "build a given project")
class BuildCmd(SubCmd):
    def run(self, args):
        opts = setup_build_options(args)
        if args.clean:
            clean_dirs(opts)

        manifest = load_project(opts, args.project)

        ctx = context_from_host_tuple()
        projects = manifests_in_dependency_order(opts, manifest, ctx)

        # Accumulate the install directories so that the build steps
        # can find their dep installation
        install_dirs = []

        for m in projects:
            print("Assessing %s..." % m.name)
            fetcher = m.create_fetcher(opts, ctx)

            if args.clean:
                fetcher.clean()
            change_status = fetcher.update()
            reconfigure = change_status.build_changed()
            sources_changed = change_status.sources_changed()

            dirs = opts.compute_dirs(m, fetcher)
            build_dir = dirs["build_dir"]
            inst_dir = dirs["inst_dir"]

            built_marker = os.path.join(inst_dir, ".built-by-getdeps")
            if os.path.exists(built_marker):
                with open(built_marker, "r") as f:
                    built_hash = f.read().strip()
                if built_hash != hash:
                    # Some kind of inconsistency with a prior build,
                    # let's run it again to be sure
                    os.unlink(built_marker)

            if sources_changed or reconfigure or not os.path.exists(built_marker):
                if os.path.exists(built_marker):
                    os.unlink(built_marker)
                src_dir = fetcher.get_src_dir()
                builder = m.create_builder(opts, src_dir, build_dir, inst_dir, ctx)
                builder.build(install_dirs, reconfigure=reconfigure)

                with open(built_marker, "w") as f:
                    f.write(dirs["hash"])

            install_dirs.append(inst_dir)

    def setup_parser(self, parser):
        parser.add_argument(
            "project",
            help=(
                "name of the project or path to a manifest "
                "file describing the project"
            ),
        )
        parser.add_argument(
            "--clean",
            action="store_true",
            default=False,
            help=(
                "Clean up the build and installation area prior to building, "
                "causing the projects to be built from scratch"
            ),
        )


@cmd("test", "test a given project")
class TestCmd(SubCmd):
    def run(self, args):
        opts = setup_build_options(args)
        manifest = load_project(opts, args.project)

        ctx = context_from_host_tuple()
        projects = manifests_in_dependency_order(opts, manifest, ctx)

        # Accumulate the install directories so that the test steps
        # can find their dep installation
        install_dirs = []

        for m in projects:
            fetcher = m.create_fetcher(opts, ctx)

            dirs = opts.compute_dirs(m, fetcher)
            build_dir = dirs["build_dir"]
            inst_dir = dirs["inst_dir"]

            if m == manifest or args.test_all:
                built_marker = os.path.join(inst_dir, ".built-by-getdeps")
                if not os.path.exists(built_marker):
                    print("project %s has not been built" % m.name)
                    # TODO: we could just go ahead and build it here, but I
                    # want to tackle that as part of adding build-for-test
                    # support.
                    return 1
                src_dir = fetcher.get_src_dir()
                builder = m.create_builder(opts, src_dir, build_dir, inst_dir, ctx)
                builder.run_tests(install_dirs)

            install_dirs.append(inst_dir)

    def setup_parser(self, parser):
        parser.add_argument(
            "project",
            help=(
                "name of the project or path to a manifest "
                "file describing the project"
            ),
        )
        parser.add_argument(
            "--test-all",
            action="store_true",
            default=False,
            help="Enable running tests for the named project and all of its deps",
        )


def build_argparser():
    common_args = argparse.ArgumentParser(add_help=False)
    common_args.add_argument(
        "--scratch-path", help="Where to maintain checkouts and build dirs"
    )
    common_args.add_argument(
        "--install-prefix",
        help=(
            "Where the final build products will be installed "
            "(default is [scratch-path]/installed)"
        ),
    )
    common_args.add_argument(
        "--num-jobs",
        type=int,
        help=(
            "Number of concurrent jobs to use while building. "
            "(default=number of cpu cores)"
        ),
    )
    common_args.add_argument(
        "--use-shipit",
        help="use the real ShipIt instead of the simple shipit transformer",
        action="store_true",
        default=False,
    )

    ap = argparse.ArgumentParser(
        description="Get and build dependencies and projects", parents=[common_args]
    )
    sub = ap.add_subparsers(
        # metavar suppresses the long and ugly default list of subcommands on a
        # single line.  We still render the nicer list below where we would
        # have shown the nasty one.
        metavar="",
        title="Available commands",
        help="",
    )

    add_subcommands(sub, common_args)

    return ap


def main():
    ap = build_argparser()
    args = ap.parse_args()
    if getattr(args, "func", None) is None:
        ap.print_help()
        return 0
    try:
        return args.func(args)
    except subprocess.CalledProcessError:
        print("!! Failed", file=sys.stderr)
        return 1


if __name__ == "__main__":
    sys.exit(main())