import tempfile
from pathlib import Path
import os

import pytest

from scripts.snap_pac import check_skip, ConfigProcessor, get_snapper_configs, Prefile, SnapperCmd


@pytest.mark.parametrize("snapper_cmd, actual_cmd", [
    (
        SnapperCmd("root", "pre", "number", "foo"),
        "snapper --config root create --cleanup-algorithm number --print-number --description \"foo\" --type pre"
    ),
    (
        SnapperCmd("root", "post", "number", "bar", False, 1234),
        "snapper --config root create --cleanup-algorithm number --print-number"
        " --description \"bar\" --pre-number 1234 --type post"
    ),
    (
        SnapperCmd("root", "post", "number", "bar", True, 1234),
        "snapper --no-dbus --config root create --cleanup-algorithm number --print-number"
        " --description \"bar\" --pre-number 1234 --type post"
    ),
    (
        SnapperCmd("root", "post", "number", "bar", False, 1234, "important=yes"),
        "snapper --config root create --cleanup-algorithm number --print-number"
        " --description \"bar\" --userdata \"important=yes\" --pre-number 1234 --type post"
    ),
    (
        SnapperCmd("root", "post", "number", "bar", False, 1234, "foo=bar,important=yes"),
        "snapper --config root create --cleanup-algorithm number --print-number"
        " --description \"bar\" --userdata \"foo=bar,important=yes\" --pre-number 1234 --type post"
    ),
    (
        SnapperCmd("root", "post", "number", "bar", False, None, "foo=bar,important=yes"),
        "snapper --config root create --cleanup-algorithm number --print-number"
        " --description \"bar\" --userdata \"foo=bar,important=yes\" --type single"
    )
])
def test_snapper_cmd(snapper_cmd, actual_cmd):
    assert str(snapper_cmd) == actual_cmd


def test_get_snapper_configs():
    with tempfile.NamedTemporaryFile("w", delete=False) as f:
        f.write("## Path: System/Snapper\n")
        f.write("\n")
        f.write("## Type:        string\n")
        f.write("## Default:     \"\"\n")
        f.write("# List of snapper configurations.\n")
        f.write("SNAPPER_CONFIGS=\"home root foo bar\"\n")
        name = f.name
    assert get_snapper_configs(Path(name)) == ["home", "root", "foo", "bar"]


def test_skip_snap_pac():
    os.environ["SNAP_PAC_SKIP"] = "y"
    assert check_skip() is True


@pytest.mark.parametrize("section, command, packages, snapshot_type, result", [
    (
        "root", "foo", ["bar"], "pre",
        {"description": "foo", "cleanup_algorithm": "number", "userdata": "", "snapshot": True}
    ),
    (
        "root", "pacman -Syu", [], "pre",
        {"description": "pacman -Syu", "cleanup_algorithm": "number", "userdata": "important=yes", "snapshot": True}
    ),
    (
        "mail", "pacman -Syu", [], "pre",
        {"description": "pacman -Syu", "cleanup_algorithm": "number", "userdata": "", "snapshot": False}
    ),
    (
        "home", "pacman -Syu", [], "pre",
        {"description": "pac", "cleanup_algorithm": "number", "userdata": "foo=bar,requestid=42", "snapshot": True}
    ),
    (
        "home", "pacman -Syu", [], "post",
        {"description": "a r", "cleanup_algorithm": "number", "userdata": "foo=bar,requestid=42", "snapshot": True}
    ),
    (
        "myconfig", "pacman -S linux", ["linux"], "post",
        {"description": "linux", "cleanup_algorithm": "timeline",
         "userdata": "foo=bar,important=yes,requestid=42", "snapshot": True}
    ),
])
def test_config_processor(section, command, packages, snapshot_type, result):
    with tempfile.NamedTemporaryFile("w", delete=False) as f:
        f.write("[root]\n")
        f.write("important_commands = [\"pacman -Syu\"]\n\n")
        f.write("[home]\n")
        f.write("snapshot = True\n")
        f.write("desc_limit = 3\n")
        f.write("post_description = a really long description\n")
        f.write("userdata = [\"foo=bar\", \"requestid=42\"]\n\n")
        f.write("[myconfig]\n")
        f.write("snapshot = True\n")
        f.write("cleanup_algorithm = timeline\n")
        f.write("important_packages = [\"linux\", \"linux-lts\"]\n")
        f.write("userdata = [\"foo=bar\", \"requestid=42\"]\n")
        name = f.name
    config_processor = ConfigProcessor(name, snapshot_type, command, packages)
    assert config_processor(section) == result


def test_prefile_read_none():
    prefile = Prefile("root", "pre")
    assert prefile.read() is None


def test_prefile_read():
    prefile = Prefile("root", "pre")
    prefile.write("1234")
    prefile = Prefile("root", "post")
    assert prefile.read() == "1234"


def test_no_prefile():
    prefile = Prefile("foo-pre-file-not-found", "post")
    assert prefile.read() is None