import subprocess

import pytest

from okx_codex_trader.codex_analyzer import analyze_with_codex
from okx_codex_trader.models import Candle


def sample_candles() -> list[Candle]:
    return [
        Candle(symbol="BTC-USDT-SWAP", ts=1, open=100.0, high=105.0, low=99.0, close=104.0, volume=10.0),
        Candle(symbol="BTC-USDT-SWAP", ts=2, open=104.0, high=106.0, low=103.0, close=105.0, volume=12.0),
        Candle(symbol="BTC-USDT-SWAP", ts=3, open=105.0, high=107.0, low=104.0, close=106.0, volume=11.0),
    ]


def fake_runner(stdout: str, returncode: int = 0):
    calls: list[tuple[object, bool, bool, bool]] = []

    def runner(command, capture_output: bool, text: bool, check: bool):
        calls.append((command, capture_output, text, check))
        return subprocess.CompletedProcess(command, returncode, stdout=stdout, stderr="")

    runner.calls = calls
    return runner


def fake_which(path: str = "/tmp/fake-codex"):
    calls: list[str] = []

    def which(name: str) -> str:
        calls.append(name)
        return path

    which.calls = calls
    return which


def missing_which(name: str) -> None:
    assert name == "codex"
    return None


def test_analyzer_fails_when_codex_is_missing():
    with pytest.raises(FileNotFoundError):
        analyze_with_codex(candles=sample_candles(), symbol="BTC-USDT-SWAP", bar="1H", which=missing_which)


def test_analyzer_rejects_non_json_output():
    runner = fake_runner(stdout="not json")
    which = fake_which()

    with pytest.raises(ValueError):
        analyze_with_codex(candles=sample_candles(), symbol="BTC-USDT-SWAP", bar="1H", runner=runner, which=which)

    assert which.calls == ["codex"]


def test_analyzer_rejects_json_leverage_out_of_range():
    runner = fake_runner(
        stdout='{"action":"long","confidence":0.8,"leverage":4,"entry_price":null,"take_profit_price":null,"stop_loss_price":null,"reason":"x"}'
    )
    which = fake_which()

    with pytest.raises(ValueError):
        analyze_with_codex(candles=sample_candles(), symbol="BTC-USDT-SWAP", bar="1H", runner=runner, which=which)

    assert which.calls == ["codex"]


def test_analyzer_rejects_non_zero_exit_with_non_json_stdout():
    runner = fake_runner(stdout="not json", returncode=1)
    which = fake_which()

    with pytest.raises(ValueError, match="codex execution failed"):
        analyze_with_codex(candles=sample_candles(), symbol="BTC-USDT-SWAP", bar="1H", runner=runner, which=which)

    assert which.calls == ["codex"]


def test_analyzer_rejects_non_zero_exit_with_json_stdout():
    runner = fake_runner(
        stdout='{"action":"long","confidence":0.8,"leverage":2,"entry_price":null,"take_profit_price":null,"stop_loss_price":null,"reason":"x"}',
        returncode=1,
    )
    which = fake_which()

    with pytest.raises(ValueError, match="codex execution failed"):
        analyze_with_codex(candles=sample_candles(), symbol="BTC-USDT-SWAP", bar="1H", runner=runner, which=which)

    assert which.calls == ["codex"]


def test_analyzer_returns_valid_trade_signal():
    runner = fake_runner(
        stdout='{"action":"short","confidence":0.6,"leverage":2,"entry_price":101.5,"take_profit_price":99.0,"stop_loss_price":103.0,"reason":"trend"}'
    )
    which = fake_which()

    signal = analyze_with_codex(
        candles=sample_candles(),
        symbol="BTC-USDT-SWAP",
        bar="1H",
        runner=runner,
        which=which,
    )

    assert signal.action == "short"
    assert signal.confidence == 0.6
    assert signal.leverage == 2
    assert signal.entry_price == 101.5
    assert signal.take_profit_price == 99.0
    assert signal.stop_loss_price == 103.0
    assert signal.reason == "trend"
    assert which.calls == ["codex"]
    assert runner.calls
    assert runner.calls[0][0][0:2] == ["codex", "exec"]
    assert runner.calls[0][1:] == (True, True, False)
    prompt = runner.calls[0][0][2]
    assert "return exactly one JSON object" in prompt
    assert "Do not output markdown, prose, or code fences." in prompt
    assert '"action", "confidence", "leverage", "entry_price", "take_profit_price", "stop_loss_price", "reason"' in prompt
    assert 'Valid actions are "long", "short", and "flat".' in prompt
    assert 'candles: [{"symbol":"BTC-USDT-SWAP"' in prompt