import shutil
import subprocess
import sys
from pathlib import Path
from unittest import mock

import pytest

from briefcase.exceptions import BriefcaseCommandError
from briefcase.platforms.linux import system
from briefcase.platforms.linux.system import (
    LinuxSystemPackageCommand,
    debian_multiline_description,
)

from ....utils import create_file


@pytest.fixture
def package_command(dummy_console, first_app, tmp_path):
    command = LinuxSystemPackageCommand(
        console=dummy_console,
        base_path=tmp_path / "base_path",
        data_path=tmp_path / "briefcase",
    )
    command.tools.home_path = tmp_path / "home"

    # Mock ABI from packaging system
    command._deb_abi = "wonky"

    # Mock the app context
    command.tools.app_tools[first_app].app_context = mock.MagicMock()

    # Mock shutil
    command.tools.shutil = mock.MagicMock()
    # Make the mock rmtree still remove content
    command.tools.shutil.rmtree.side_effect = shutil.rmtree

    # Mock not using docker
    command.target_image = None
    command.extra_docker_build_args = []

    return command


@pytest.fixture
def first_app_deb(first_app):
    # Mock a debian app
    first_app.python_version_tag = "3.10"
    first_app.target_vendor_base = "debian"
    first_app.packaging_format = "deb"
    first_app.glibc_version = "2.99"
    first_app.long_description = "Long description\nfor the app"

    return first_app


@pytest.fixture
def external_first_app_deb(first_app_deb, tmp_path):
    # Make the app external
    first_app_deb.sources = None
    first_app_deb.external_package_path = tmp_path / "base_path/external/package-deb"

    # Move the generated first app to the external location
    (tmp_path / "base_path/external").mkdir()
    shutil.move(
        tmp_path / "base_path/build/first-app/somevendor/surprising/first-app-0.0.1",
        tmp_path / "base_path/external/package-deb",
    )
    return first_app_deb


def test_verify_no_docker(package_command, first_app_deb, monkeypatch):
    """If not using docker, existence of dpkg-deb is verified."""
    # Mock the existence of dpkg-deb
    package_command.tools.shutil.which = mock.MagicMock(return_value="/mybin/dpkg-deb")

    # App tools can be verified
    package_command.verify_app_tools(first_app_deb)

    # dpkg_deb was inspected
    package_command.tools.shutil.which.assert_called_once_with("dpkg-deb")


@pytest.mark.parametrize(
    "vendor_base, error_msg",
    [
        (
            "debian",
            "Can't find the dpkg tools. Try running `sudo apt install dpkg-dev`.",
        ),
        (None, "Can't find the dpkg-deb tool. Install this first to package the deb."),
    ],
)
def test_verify_dpkg_deb_missing(
    package_command,
    first_app_deb,
    vendor_base,
    error_msg,
    monkeypatch,
):
    """If dpkg-deb isn't installed, an error is raised."""
    # Mock distro so packager is found or not appropriately
    first_app_deb.target_vendor_base = vendor_base

    # Mock packager as missing
    package_command.tools.shutil.which = mock.MagicMock(return_value="")

    # Verifying app tools will raise an error
    with pytest.raises(BriefcaseCommandError, match=error_msg):
        package_command.verify_app_tools(first_app_deb)

    # which was called for dpkg-deb
    package_command.tools.shutil.which.assert_called_once_with("dpkg-deb")


def test_verify_docker(package_command, first_app_deb, monkeypatch):
    """If using Docker, no tool checks are needed."""
    # Mock using docker
    package_command.target_image = "somevendor:surprising"

    # Mock the existence of a valid non-docker system Python
    # with the same major/minor as the current Python,
    # plus the existence of dpkg-deb
    python3 = mock.MagicMock()
    python3.resolve.return_value = Path(
        f"/usr/bin/python{sys.version_info.major}.{sys.version_info.minor}"
    )

    dpkg_deb = mock.MagicMock()
    dpkg_deb.exists.return_value = False

    mock_Path = mock.MagicMock(side_effect=[python3, dpkg_deb])
    monkeypatch.setattr(system, "Path", mock_Path)

    # App tools can be verified
    package_command.verify_app_tools(first_app_deb)

    # dpkg_deb was not inspected
    dpkg_deb.exists.assert_not_called()


@pytest.mark.skipif(sys.platform == "win32", reason="Can't build debs on Windows")
def test_deb_package(package_command, first_app_deb, tmp_path):
    """A deb app can be packaged."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"

    # Package the app
    package_command.package_app(first_app_deb)

    # The control file is written
    assert (bundle_path / "first-app-0.0.1/DEBIAN/control").exists()
    with (bundle_path / "first-app-0.0.1/DEBIAN/control").open(encoding="utf-8") as f:
        assert (
            f.read()
            == "\n".join(
                [
                    "Package: first-app",
                    "Version: 0.0.1",
                    "Architecture: wonky",
                    "Maintainer: Megacorp <maintainer@example.com>",
                    "Homepage: https://example.com/first-app",
                    "Description: The first simple app \\ demonstration",
                    " Long description",
                    " for the app",
                    "Depends: libc6 (>=2.99), libpython3.10",
                    "Section: utils",
                    "Priority: optional",
                ]
            )
            + "\n"
        )

    package_command.tools.app_tools[
        first_app_deb
    ].app_context.run.assert_called_once_with(
        [
            "dpkg-deb",
            "--build",
            "--root-owner-group",
            bundle_path / "first-app-0.0.1",
        ],
        check=True,
        cwd=bundle_path,
    )

    # The deb was moved into the final location
    package_command.tools.shutil.move.assert_called_once_with(
        bundle_path / "first-app-0.0.1.deb",
        tmp_path / "base_path/dist/first-app_0.0.1-1~somevendor-surprising_wonky.deb",
    )


def test_deb_re_package(package_command, first_app_deb, tmp_path):
    """A deb app that has previously been packaged can be re-packaged."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"

    # Create an old control file that will be overwritten.
    create_file(bundle_path / "first-app-0.0.1/DEBIAN/control", "Old control content")

    # Package the app
    package_command.package_app(first_app_deb)

    # The control file is re-written
    assert (bundle_path / "first-app-0.0.1/DEBIAN/control").exists()
    with (bundle_path / "first-app-0.0.1/DEBIAN/control").open(encoding="utf-8") as f:
        assert (
            f.read()
            == "\n".join(
                [
                    "Package: first-app",
                    "Version: 0.0.1",
                    "Architecture: wonky",
                    "Maintainer: Megacorp <maintainer@example.com>",
                    "Homepage: https://example.com/first-app",
                    "Description: The first simple app \\ demonstration",
                    " Long description",
                    " for the app",
                    "Depends: libc6 (>=2.99), libpython3.10",
                    "Section: utils",
                    "Priority: optional",
                ]
            )
            + "\n"
        )

    package_command.tools.app_tools[
        first_app_deb
    ].app_context.run.assert_called_once_with(
        [
            "dpkg-deb",
            "--build",
            "--root-owner-group",
            bundle_path / "first-app-0.0.1",
        ],
        check=True,
        cwd=bundle_path,
    )

    # The deb was moved into the final location
    package_command.tools.shutil.move.assert_called_once_with(
        bundle_path / "first-app-0.0.1.deb",
        tmp_path / "base_path/dist/first-app_0.0.1-1~somevendor-surprising_wonky.deb",
    )


def test_deb_package_no_long_description(package_command, first_app_deb, tmp_path):
    """A deb app without a long description raises an error."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"

    # Delete the long description
    first_app_deb.long_description = None

    # Packaging the app will fail
    with pytest.raises(
        BriefcaseCommandError,
        match=r"App configuration does not define `long_description`. Debian projects require a long description.",
    ):
        package_command.package_app(first_app_deb)

    # The control file won't be written
    assert not (bundle_path / "first-app-0.0.1/DEBIAN/control").exists()


@pytest.mark.parametrize(
    "input, output",
    [
        ["", ""],
        ["one line", "one line"],
        ["first line\nsecond line", "first line\n second line"],
        ["first line\n\nsecond line", "first line\n second line"],
        ["first line\n  \nsecond line", "first line\n second line"],
    ],
)
def test_multiline_long_description(input, output):
    """Multiline debian descriptions are transformed."""
    assert debian_multiline_description(input) == output


def test_deb_package_extra_requirements(package_command, first_app_deb, tmp_path):
    """A deb app can be packaged with extra runtime requirements and configuration
    options."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"

    # Add system requirements and other optional settings.
    first_app_deb.system_runtime_requires = ["first", "second (>=1.2.3)"]
    first_app_deb.revision = 42
    first_app_deb.system_section = "Funny stuff"

    # Package the app
    package_command.package_app(first_app_deb)

    # The control file is written
    assert (bundle_path / "first-app-0.0.1/DEBIAN/control").exists()
    with (bundle_path / "first-app-0.0.1/DEBIAN/control").open(encoding="utf-8") as f:
        assert (
            f.read()
            == "\n".join(
                [
                    "Package: first-app",
                    "Version: 0.0.1",
                    "Architecture: wonky",
                    "Maintainer: Megacorp <maintainer@example.com>",
                    "Homepage: https://example.com/first-app",
                    "Description: The first simple app \\ demonstration",
                    " Long description",
                    " for the app",
                    "Depends: libc6 (>=2.99), libpython3.10, first, second (>=1.2.3)",
                    "Section: Funny stuff",
                    "Priority: optional",
                ]
            )
            + "\n"
        )

    package_command.tools.app_tools[
        first_app_deb
    ].app_context.run.assert_called_once_with(
        [
            "dpkg-deb",
            "--build",
            "--root-owner-group",
            bundle_path / "first-app-0.0.1",
        ],
        check=True,
        cwd=bundle_path,
    )

    # The deb was moved into the final location
    package_command.tools.shutil.move.assert_called_once_with(
        bundle_path / "first-app-0.0.1.deb",
        tmp_path / "base_path/dist/first-app_0.0.1-42~somevendor-surprising_wonky.deb",
    )


def test_deb_package_failure(package_command, first_app_deb, tmp_path):
    """If a packaging doesn't succeed, an error is raised."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"

    # Mock a packaging failure
    package_command.tools.app_tools[
        first_app_deb
    ].app_context.run.side_effect = subprocess.CalledProcessError(
        cmd="dpkg-deb ...", returncode=-1
    )

    # Package the app
    with pytest.raises(
        BriefcaseCommandError, match=r"Error while building .deb package for first-app."
    ):
        package_command.package_app(first_app_deb)

    # The control file is written
    assert (bundle_path / "first-app-0.0.1/DEBIAN/control").exists()
    with (bundle_path / "first-app-0.0.1/DEBIAN/control").open(encoding="utf-8") as f:
        assert (
            f.read()
            == "\n".join(
                [
                    "Package: first-app",
                    "Version: 0.0.1",
                    "Architecture: wonky",
                    "Maintainer: Megacorp <maintainer@example.com>",
                    "Homepage: https://example.com/first-app",
                    "Description: The first simple app \\ demonstration",
                    " Long description",
                    " for the app",
                    "Depends: libc6 (>=2.99), libpython3.10",
                    "Section: utils",
                    "Priority: optional",
                ]
            )
            + "\n"
        )

    # The call to package was made
    package_command.tools.app_tools[
        first_app_deb
    ].app_context.run.assert_called_once_with(
        [
            "dpkg-deb",
            "--build",
            "--root-owner-group",
            bundle_path / "first-app-0.0.1",
        ],
        check=True,
        cwd=bundle_path,
    )

    # The deb wasn't built, so it wasn't moved.
    package_command.tools.shutil.move.assert_not_called()


@pytest.mark.skipif(sys.platform == "win32", reason="Can't build debs on Windows")
def test_external_deb_package_docker(package_command, external_first_app_deb, tmp_path):
    """An external app cannot be packaged as a deb using Docker."""
    bundle_path = tmp_path / "base_path/build/first-app/somevendor/surprising"
    package_path = tmp_path / "base_path/external/package-deb"

    # Package the app
    package_command.package_app(external_first_app_deb)

    # The control file is written
    assert (package_path / "DEBIAN/control").exists()
    with (package_path / "DEBIAN/control").open(encoding="utf-8") as f:
        assert (
            f.read()
            == "\n".join(
                [
                    "Package: first-app",
                    "Version: 0.0.1",
                    "Architecture: wonky",
                    "Maintainer: Megacorp <maintainer@example.com>",
                    "Homepage: https://example.com/first-app",
                    "Description: The first simple app \\ demonstration",
                    " Long description",
                    " for the app",
                    "Depends: libc6 (>=2.99), libpython3.10",
                    "Section: utils",
                    "Priority: optional",
                ]
            )
            + "\n"
        )

    package_command.tools.app_tools[
        external_first_app_deb
    ].app_context.run.assert_called_once_with(
        [
            "dpkg-deb",
            "--build",
            "--root-owner-group",
            package_path,
        ],
        check=True,
        cwd=bundle_path,
    )

    # The deb was moved into the final location
    package_command.tools.shutil.move.assert_called_once_with(
        tmp_path / "base_path/external/package-deb.deb",
        tmp_path / "base_path/dist/first-app_0.0.1-1~somevendor-surprising_wonky.deb",
    )