"""DaemonConfig .env loading tests (REQ-010)."""
from __future__ import annotations

import pytest

from trex_core.runtime.config import DaemonConfig

_KEYS = (
    "TREX_POSTGRESQL_DSN", "TREX_EXECUTION_INTERVAL_SEC", "TREX_API_HOST",
    "TREX_API_PORT", "TREX_PAPER_FILL_AFTER_POLLS", "TREX_PAPER_QTY_PER_POLL",
    "TREX_PAPER_REJECT_SYMBOLS",
)


@pytest.fixture(autouse=True)
def _clean_env(monkeypatch):
    for k in _KEYS:
        monkeypatch.delenv(k, raising=False)


def test_loads_values_from_dotenv(tmp_path, monkeypatch):
    """AC-1: .env in CWD is loaded when the OS env var is unset."""
    (tmp_path / ".env").write_text(
        "TREX_POSTGRESQL_DSN=dbname=from_dotenv\nTREX_EXECUTION_INTERVAL_SEC=7.0\n"
    )
    monkeypatch.chdir(tmp_path)
    cfg = DaemonConfig.from_env()
    assert cfg.dsn == "dbname=from_dotenv"
    assert cfg.execution_interval_sec == 7.0


def test_os_env_takes_precedence_over_dotenv(tmp_path, monkeypatch):
    """AC-2: real OS env wins over .env (override=False)."""
    (tmp_path / ".env").write_text("TREX_POSTGRESQL_DSN=dbname=from_dotenv\n")
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "dbname=from_os_env")
    cfg = DaemonConfig.from_env()
    assert cfg.dsn == "dbname=from_os_env"


def test_no_dotenv_uses_os_env_only(tmp_path, monkeypatch):
    """AC-3: with no .env, behaviour is unchanged (os.environ only)."""
    monkeypatch.chdir(tmp_path)  # empty dir, no .env
    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "dbname=os_only")
    cfg = DaemonConfig.from_env()
    assert cfg.dsn == "dbname=os_only"
    assert cfg.execution_interval_sec == 1.0  # default


def test_missing_dsn_raises(tmp_path, monkeypatch):
    """No .env and no env var -> required DSN error (regression guard)."""
    monkeypatch.chdir(tmp_path)
    with pytest.raises(RuntimeError):
        DaemonConfig.from_env()


def test_paper_broker_defaults(tmp_path, monkeypatch):
    """Unset paper env == immediate full fills, no rejects (REQ-011)."""
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "dbname=x")
    cfg = DaemonConfig.from_env()
    assert cfg.paper.fill_after_polls == 0
    assert cfg.paper.qty_per_poll is None
    assert cfg.paper.reject_symbols == frozenset()


def test_paper_broker_env_tuning(tmp_path, monkeypatch):
    """Paper broker scenario knobs are parsed from env (REQ-011)."""
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "dbname=x")
    monkeypatch.setenv("TREX_PAPER_FILL_AFTER_POLLS", "2")
    monkeypatch.setenv("TREX_PAPER_QTY_PER_POLL", "4")
    monkeypatch.setenv("TREX_PAPER_REJECT_SYMBOLS", "005930, 000660 ,")
    cfg = DaemonConfig.from_env()
    assert cfg.paper.fill_after_polls == 2
    assert cfg.paper.qty_per_poll == 4
    assert cfg.paper.reject_symbols == frozenset({"005930", "000660"})