# Copyright (c) 2014-present PlatformIO <contact@platformio.org>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os

from platformio import __core_packages__, exception
from platformio.package.exception import UnknownPackageError
from platformio.package.manager.tool import ToolPackageManager
from platformio.package.meta import PackageSpec


def get_installed_core_packages():
    result = []
    pm = ToolPackageManager()
    for name, requirements in __core_packages__.items():
        spec = PackageSpec(owner="platformio", name=name, requirements=requirements)
        pkg = pm.get_package(spec)
        if pkg:
            result.append(pkg)
    return result


def get_core_package_dir(name, spec=None, auto_install=True):
    if name not in __core_packages__:
        raise exception.PlatformioException("Please upgrade PlatformIO Core")
    pm = ToolPackageManager()
    spec = spec or PackageSpec(
        owner="platformio", name=name, requirements=__core_packages__[name]
    )
    pkg = pm.get_package(spec)
    if pkg:
        return pkg.path
    if not auto_install:
        return None
    assert pm.install(spec)
    remove_unnecessary_core_packages()
    return pm.get_package(spec).path


def update_core_packages():
    pm = ToolPackageManager()
    for name, requirements in __core_packages__.items():
        spec = PackageSpec(owner="platformio", name=name, requirements=requirements)
        try:
            pm.update(spec, spec)
        except UnknownPackageError:
            pass
    remove_unnecessary_core_packages()
    return True


def remove_unnecessary_core_packages(dry_run=False):
    candidates = []
    pm = ToolPackageManager()
    best_pkg_versions = {}

    for name, requirements in __core_packages__.items():
        spec = PackageSpec(owner="platformio", name=name, requirements=requirements)
        pkg = pm.get_package(spec)
        if not pkg:
            continue
        # pylint: disable=no-member
        best_pkg_versions[pkg.metadata.name] = pkg.metadata.version

    for pkg in pm.get_installed():
        skip_conds = [
            os.path.isfile(os.path.join(pkg.path, ".piokeep")),
            pkg.metadata.spec.owner != "platformio",
            pkg.metadata.name not in best_pkg_versions,
            pkg.metadata.name in best_pkg_versions
            and pkg.metadata.version == best_pkg_versions[pkg.metadata.name],
        ]
        if not any(skip_conds):
            candidates.append(pkg)

    if dry_run:
        return candidates

    for pkg in candidates:
        pm.uninstall(pkg)

    return candidates
