from __future__ import annotations

from pathlib import Path

import pytest

from main import _build_rsync_cmd, _load_raw, load_config

# ── _build_rsync_cmd ─────────────────────────────────────────────────────────


def test_build_rsync_cmd_no_params() -> None:
    cmd = _build_rsync_cmd({})
    assert cmd == ("rsync", "-avh", "--progress", "--delete", "--stats")


def test_build_rsync_cmd_with_rsync_path() -> None:
    cmd = _build_rsync_cmd({"rsync_path": "/usr/local/bin/rsync"})
    assert "--rsync-path=/usr/local/bin/rsync" in cmd


def test_build_rsync_cmd_with_exclude_from() -> None:
    cmd = _build_rsync_cmd({"exclude_from": ".gitignore"})
    assert "--exclude-from=.gitignore" in cmd


def test_build_rsync_cmd_with_all_params() -> None:
    cmd = _build_rsync_cmd({"rsync_path": "/opt/rsync", "exclude_from": "exc.txt"})
    assert "--rsync-path=/opt/rsync" in cmd
    assert "--exclude-from=exc.txt" in cmd


# ── _load_raw ────────────────────────────────────────────────────────────────


def test_load_raw_toml(tmp_path: Path) -> None:
    p = tmp_path / "cfg.toml"
    p.write_text('remote_folder = "host:/dst"\nlocal_folders = ["a"]\n')
    raw = _load_raw(p)
    assert raw["remote_folder"] == "host:/dst"


def test_load_raw_json(tmp_path: Path) -> None:
    p = tmp_path / "cfg.json"
    p.write_text('{"remote_folder": "/dst", "local_folders": ["a"]}')
    raw = _load_raw(p)
    assert raw["remote_folder"] == "/dst"


def test_load_raw_unsupported_format(tmp_path: Path) -> None:
    p = tmp_path / "cfg.yaml"
    p.write_text("key: val")
    with pytest.raises(SystemExit):
        _load_raw(p)


# ── load_config ──────────────────────────────────────────────────────────────


def test_load_config_valid(tmp_path: Path) -> None:
    d = tmp_path / "src"
    d.mkdir()
    p = tmp_path / "cfg.toml"
    p.write_text(f'remote_folder = "host:/dst"\nlocal_folders = ["{d}"]\nn = 1\n')
    cfg = load_config(p)
    assert cfg["remote_folder"] == "host:/dst"
    assert cfg["local_folders"] == [d]
    assert cfg["n"] == 1
    assert cfg["log_level"] == "INFO"


def test_load_config_empty_folders(tmp_path: Path) -> None:
    p = tmp_path / "cfg.toml"
    p.write_text('remote_folder = "host:/dst"\nlocal_folders = []\n')
    with pytest.raises(SystemExit):
        load_config(p)


def test_load_config_missing_remote(tmp_path: Path) -> None:
    d = tmp_path / "src"
    d.mkdir()
    p = tmp_path / "cfg.toml"
    p.write_text(f'local_folders = ["{d}"]\n')
    with pytest.raises(SystemExit):
        load_config(p)


def test_load_config_n_clamped(tmp_path: Path) -> None:
    d = tmp_path / "src"
    d.mkdir()
    p = tmp_path / "cfg.toml"
    p.write_text(f'remote_folder = "host:/dst"\nlocal_folders = ["{d}"]\nn = 99\n')
    cfg = load_config(p)
    assert cfg["n"] == 1  # clamped to len(folders)


def test_load_config_invalid_log_level(tmp_path: Path) -> None:
    d = tmp_path / "src"
    d.mkdir()
    p = tmp_path / "cfg.toml"
    p.write_text(
        f'remote_folder = "host:/dst"\nlocal_folders = ["{d}"]\nlog_level = "TRACE"\n'
    )
    with pytest.raises(SystemExit):
        load_config(p)