from __future__ import annotations

from pathlib import Path
from unittest.mock import patch

import pytest


def _write_env(tmp_path: Path, body: str) -> Path:
    env = tmp_path / ".env"
    env.write_text(body)
    return env


def test_load_settings_reads_env_and_creates_runtime_dirs(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    _write_env(
        tmp_path,
        "ANTHROPIC_API_KEY=sk-ant-test\nANTHROPIC_MODEL=claude-haiku-4-5-20251001\nNTFY_TOPIC=topictopic12\n",
    )
    monkeypatch.setattr("relay.config.REPO_ROOT", tmp_path)
    monkeypatch.setattr("relay.config.ENV_FILE", tmp_path / ".env")
    monkeypatch.setattr("relay.config.CONFIG_FILE", tmp_path / "config.yaml")

    from relay.config import load_settings  # import after monkeypatch

    s = load_settings()
    assert s.api_key == "sk-ant-test"
    assert s.model == "claude-haiku-4-5-20251001"
    assert s.ntfy_topic == "topictopic12"
    for d in (s.queue_dir, s.dispatch_dir, s.state_dir, s.logs_dir):
        assert d.exists()


def test_load_settings_generates_ntfy_topic_when_blank(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    _write_env(tmp_path, "ANTHROPIC_API_KEY=sk-ant-test\nNTFY_TOPIC=\n")
    monkeypatch.setattr("relay.config.REPO_ROOT", tmp_path)
    monkeypatch.setattr("relay.config.ENV_FILE", tmp_path / ".env")
    monkeypatch.setattr("relay.config.CONFIG_FILE", tmp_path / "config.yaml")

    from relay.config import load_settings

    with patch("relay.config._generate_ntfy_topic", return_value="generatedtopic1"):
        s = load_settings()
    assert s.ntfy_topic == "generatedtopic1"
    # Persisted back to .env
    env_after = (tmp_path / ".env").read_text()
    assert "NTFY_TOPIC=generatedtopic1" in env_after


def test_load_settings_treats_inline_hash_comment_as_blank(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    """Defensive: dotenv parses 'KEY=  # comment' as 'KEY' = '  # comment'.

    The settings loader must recognise that as effectively blank so a
    fresh topic is generated.
    """
    _write_env(tmp_path, "ANTHROPIC_API_KEY=sk-ant-test\nNTFY_TOPIC=  # generated on first run\n")
    monkeypatch.setattr("relay.config.REPO_ROOT", tmp_path)
    monkeypatch.setattr("relay.config.ENV_FILE", tmp_path / ".env")
    monkeypatch.setattr("relay.config.CONFIG_FILE", tmp_path / "config.yaml")

    from relay.config import load_settings

    with patch("relay.config._generate_ntfy_topic", return_value="newtopic"):
        s = load_settings()
    assert s.ntfy_topic == "newtopic"


def test_missing_api_key_raises(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
    _write_env(tmp_path, "ANTHROPIC_MODEL=claude-opus-4-7\n")
    monkeypatch.setattr("relay.config.REPO_ROOT", tmp_path)
    monkeypatch.setattr("relay.config.ENV_FILE", tmp_path / ".env")
    monkeypatch.setattr("relay.config.CONFIG_FILE", tmp_path / "config.yaml")
    # Also ensure env var doesn't leak in
    monkeypatch.delenv("ANTHROPIC_API_KEY", raising=False)

    from relay.config import load_settings

    with pytest.raises(RuntimeError, match="ANTHROPIC_API_KEY"):
        load_settings()


def test_default_config_yaml_is_seeded_when_missing(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    _write_env(tmp_path, "ANTHROPIC_API_KEY=sk-ant-test\nNTFY_TOPIC=t1234\n")
    monkeypatch.setattr("relay.config.REPO_ROOT", tmp_path)
    monkeypatch.setattr("relay.config.ENV_FILE", tmp_path / ".env")
    monkeypatch.setattr("relay.config.CONFIG_FILE", tmp_path / "config.yaml")

    from relay.config import load_settings

    s = load_settings()
    cfg_path = tmp_path / "config.yaml"
    assert cfg_path.exists()
    assert any(sess.session_id == "session-1" for sess in s.sessions)