import pytest
from pydantic import ValidationError

from trademind.config import LIVE_CONFIRMATION_PHRASE, Config, Mode, load_config

MINIMAL = """
mode: paper
market:
  symbols: [btc/usdt]
"""


def write(tmp_path, text: str):
    path = tmp_path / "config.yaml"
    path.write_text(text, encoding="utf-8")
    return path


def test_minimal_config_uses_defaults(tmp_path):
    config = load_config(write(tmp_path, MINIMAL))
    assert config.mode is Mode.PAPER
    assert config.market.symbols == ["BTC/USDT"]  # normalisiert
    assert config.exchange.id == "binance"
    assert config.risk.max_open_positions == 3


def test_env_placeholders_are_resolved(tmp_path, monkeypatch):
    monkeypatch.setenv("MY_KEY", "abc123")
    config = load_config(
        write(tmp_path, "mode: paper\nexchange:\n  api_key: ${MY_KEY}\n  api_secret: ${MISSING}\n")
    )
    assert config.exchange.api_key == "abc123"
    assert config.exchange.api_secret is None


def test_env_placeholder_default_value(tmp_path, monkeypatch):
    monkeypatch.delenv("TRADEMIND_EXCHANGE", raising=False)
    config = load_config(write(tmp_path, "exchange:\n  id: ${TRADEMIND_EXCHANGE:-kraken}\n"))
    assert config.exchange.id == "kraken"


def test_double_underscore_env_override(tmp_path, monkeypatch):
    monkeypatch.setenv("TRADEMIND__RISK__MAX_OPEN_POSITIONS", "7")
    monkeypatch.setenv("TRADEMIND__MARKET__SYMBOLS", "BTC/USDT,ETH/USDT")
    monkeypatch.setenv("TRADEMIND__EXCHANGE__SANDBOX", "false")
    config = load_config(write(tmp_path, MINIMAL))
    assert config.risk.max_open_positions == 7
    assert config.market.symbols == ["BTC/USDT", "ETH/USDT"]
    assert config.exchange.sandbox is False


def test_live_mode_requires_confirmation(tmp_path):
    text = "mode: live\nexchange:\n  api_key: k\n  api_secret: s\n"
    with pytest.raises(ValueError, match="live_confirmation"):
        load_config(write(tmp_path, text))


def test_live_mode_requires_credentials(tmp_path):
    text = f"mode: live\nlive_confirmation: {LIVE_CONFIRMATION_PHRASE}\n"
    with pytest.raises(ValueError, match="api_key"):
        load_config(write(tmp_path, text))


def test_live_mode_accepted_when_complete(tmp_path):
    text = (
        f"mode: live\nlive_confirmation: {LIVE_CONFIRMATION_PHRASE}\n"
        "exchange:\n  api_key: k\n  api_secret: s\n"
    )
    config = load_config(write(tmp_path, text))
    assert config.mode is Mode.LIVE
    assert config.is_simulated is False


def test_unknown_key_is_rejected(tmp_path):
    with pytest.raises(ValidationError):
        load_config(write(tmp_path, "mode: paper\nrisk:\n  typo_here: 5\n"))


def test_ema_periods_must_be_ordered(tmp_path):
    with pytest.raises(ValueError, match="fast_ema"):
        load_config(write(tmp_path, "strategy:\n  rules:\n    fast_ema: 30\n    slow_ema: 10\n"))


def test_missing_file_raises(tmp_path):
    with pytest.raises(FileNotFoundError):
        load_config(tmp_path / "nope.yaml")


def test_empty_symbols_rejected(tmp_path):
    with pytest.raises(ValidationError):
        load_config(write(tmp_path, "market:\n  symbols: []\n"))


def test_config_is_simulated_flag():
    assert Config(mode=Mode.PAPER).is_simulated
    assert Config(mode=Mode.BACKTEST).is_simulated