"""Tests for reading the configuration file and expanding paths"""

import configparser
import os
import pwd
from pathlib import Path

import pytest

from simple_backup import simple_backup as sb

USER = pwd.getpwuid(os.getuid()).pw_name
HOME = pwd.getpwuid(os.getuid()).pw_dir


def write_config(path: Path, text: str) -> str:
    config_file = path / 'simple_backup.conf'
    config_file.write_text(text)

    return str(config_file)


def test_repo_copy_imported() -> None:
    repo = Path(__file__).resolve().parents[1]

    assert Path(sb.__file__).resolve().is_relative_to(repo)


@pytest.mark.parametrize('path, expected', [
    ('~', HOME),
    ('~/docs', f'{HOME}/docs'),
    ('/abs/~/path', '/abs/~/path'),
    ('relative', 'relative'),
])
def test_expand_home(path: str, expected: str) -> None:
    assert sb._expand_home(path, USER) == expected


def test_expand_inputs_glob(tmp_path: Path) -> None:
    for name in ['a.txt', 'b.txt', 'c.log']:
        (tmp_path / name).touch()

    result = sb._expand_inputs([f'{tmp_path}/*.txt', ''], USER)

    assert sorted(result) == [f'{tmp_path}/a.txt', f'{tmp_path}/b.txt']


def test_expand_inputs_no_match(tmp_path: Path, caplog: pytest.LogCaptureFixture) -> None:
    assert sb._expand_inputs([f'{tmp_path}/missing'], USER) == []
    assert 'No file or directory matching input' in caplog.text


def test_expand_inputs_tilde_without_user(caplog: pytest.LogCaptureFixture) -> None:
    sb._expand_inputs(['~/nothing-here'], None)

    assert 'Cannot expand' in caplog.text


def test_missing_config(tmp_path: Path, caplog: pytest.LogCaptureFixture) -> None:
    config_args = sb._read_config(str(tmp_path / 'missing.conf'), USER)

    assert config_args['inputs'] is None
    assert config_args['output'] is None
    assert config_args['keep'] == -1
    assert 'does not exist' in caplog.text


def test_missing_config_without_user(tmp_path: Path, caplog: pytest.LogCaptureFixture) -> None:
    sb._read_config(str(tmp_path / 'missing.conf'), None)

    assert 'User not specified' in caplog.text


def test_read_config(tmp_path: Path) -> None:
    (tmp_path / 'one').mkdir()
    (tmp_path / 'two').mkdir()

    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}/one, {tmp_path}/two, {tmp_path}/one
backup_dir=~/backups
exclude=*.bak, , *.tmp
keep=3
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['inputs'] is not None
    assert sorted(config_args['inputs']) == [f'{tmp_path}/one', f'{tmp_path}/two']
    # Expanded later, as it may be a path on the server
    assert config_args['output'] == '~/backups'
    assert config_args['exclude'] == ['*.bak', '*.tmp']
    assert config_args['keep'] == 3
    assert config_args['ssh_host'] is None
    assert config_args['ssh_user'] is None
    assert config_args['ssh_keyfile'] is None
    assert config_args['remote_sudo'] is False
    assert config_args['numeric_ids'] is False


def test_optional_keys_missing(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=/backups
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['exclude'] == []
    assert config_args['keep'] == -1


def test_old_default_section(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[default]
inputs={tmp_path}
backup_dir=/backups
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['inputs'] == [str(tmp_path)]
    assert config_args['output'] == '/backups'


def test_percent_in_values(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=/backups/100%
exclude=%temp%
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['output'] == '/backups/100%'
    assert config_args['exclude'] == ['%temp%']


def test_server_section(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=backups

[server]
ssh_host=server
ssh_user=user
ssh_keyfile=/keys/id_ed25519
remote_sudo=yes
numeric_ids=true
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['ssh_host'] == 'server'
    assert config_args['ssh_user'] == 'user'
    assert config_args['ssh_keyfile'] == '/keys/id_ed25519'
    assert config_args['remote_sudo'] is True
    assert config_args['numeric_ids'] is True


def test_empty_server_values(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=/backups

[server]
ssh_host=
ssh_user=
ssh_keyfile=
remote_sudo=
numeric_ids=
""")

    config_args = sb._read_config(config_file, USER)

    assert config_args['ssh_host'] is None
    assert config_args['ssh_user'] is None
    assert config_args['ssh_keyfile'] is None
    assert config_args['remote_sudo'] is False
    assert config_args['numeric_ids'] is False


def test_only_ssh_host(tmp_path: Path) -> None:
    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=/backups

[server]
ssh_host=server
""")

    config_args = sb._read_config(config_file, USER)

    # Kept, so that the missing user is reported instead of silently backing up locally
    assert config_args['ssh_host'] == 'server'
    assert config_args['ssh_user'] is None


@pytest.mark.parametrize('line', ['keep=abc', 'remote_sudo=maybe'])
def test_bad_value(tmp_path: Path, line: str) -> None:
    section = '[server]' if line.startswith('remote_sudo') else ''

    config_file = write_config(tmp_path, f"""
[backup]
inputs={tmp_path}
backup_dir=/backups
{section}
{line}
""")

    with pytest.raises(ValueError):
        sb._read_config(config_file, USER)


@pytest.mark.parametrize('text', [
    '[backup]\nbackup_dir=/backups\n',
    '[backup]\ninputs=/tmp\n',
    '[other]\ninputs=/tmp\n',
    'inputs=/tmp\n',
])
def test_bad_config(tmp_path: Path, text: str) -> None:
    config_file = write_config(tmp_path, text)

    with pytest.raises(configparser.Error):
        sb._read_config(config_file, USER)