"""Tests for myagents.commands.switch."""

from pathlib import Path

import pytest
from click.testing import CliRunner

from myagents.commands import switch as sw_mod


@pytest.fixture()
def fake_home(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
    home = tmp_path / "home"
    home.mkdir()
    monkeypatch.setattr(Path, "home", staticmethod(lambda: home))
    monkeypatch.setattr(sw_mod, "_install_tools", lambda runtime: [])
    workspace = tmp_path / "ws"
    workspace.mkdir()
    monkeypatch.setattr(sw_mod, "get_workspace_root", lambda create=False: workspace)
    monkeypatch.setattr(
        sw_mod,
        "sync_workspace",
        lambda ws: {"added": [], "updated": [], "skipped": [], "removed": []},
    )
    return home


def _make_versions(home: Path, versions: tuple[str, ...], current: str) -> None:
    root = home / ".xiaohe" / "runtime"
    for name in versions:
        (root / name).mkdir(parents=True)
    (root / "current").symlink_to(root / current)


class TestSwitch:
    def test_switches_current_and_reinstalls(
        self, fake_home: Path, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        _make_versions(fake_home, ("v1", "v2"), "v2")
        installed: list[str] = []
        monkeypatch.setattr(
            sw_mod, "_install_tools", lambda rt: installed.append(rt.name) or []
        )
        result = CliRunner().invoke(sw_mod.switch_cmd, ["v1", "--yes"])
        assert result.exit_code == 0, result.output
        assert "Switched: v2 -> v1" in result.output
        current = fake_home / ".xiaohe" / "runtime" / "current"
        assert current.resolve().name == "v1"
        assert installed == ["v1"]

    def test_unknown_version_errors(self, fake_home: Path) -> None:
        _make_versions(fake_home, ("v1", "v2"), "v2")
        result = CliRunner().invoke(sw_mod.switch_cmd, ["v9", "--yes"])
        assert result.exit_code != 0
        assert "not installed" in result.output

    def test_already_current_is_noop(self, fake_home: Path) -> None:
        _make_versions(fake_home, ("v1", "v2"), "v2")
        result = CliRunner().invoke(sw_mod.switch_cmd, ["v2", "--yes"])
        assert result.exit_code == 0
        assert "Already on v2" in result.output

    def test_interactive_list_and_prompt(self, fake_home: Path) -> None:
        _make_versions(fake_home, ("v1", "v2"), "v2")
        result = CliRunner().invoke(sw_mod.switch_cmd, [], input="v1\ny\n")
        assert result.exit_code == 0, result.output
        assert "v2" in result.output and "(current)" in result.output
        assert (fake_home / ".xiaohe" / "runtime" / "current").resolve().name == "v1"

    def test_cancelled_keeps_current(self, fake_home: Path) -> None:
        _make_versions(fake_home, ("v1", "v2"), "v2")
        result = CliRunner().invoke(sw_mod.switch_cmd, ["v1"], input="n\n")
        assert result.exit_code == 0
        assert "Cancelled" in result.output
        assert (fake_home / ".xiaohe" / "runtime" / "current").resolve().name == "v2"

    def test_no_versions_errors(self, fake_home: Path) -> None:
        result = CliRunner().invoke(sw_mod.switch_cmd, ["v1", "--yes"])
        assert result.exit_code != 0
        assert "No installed runtime" in result.output