from dataclasses import replace

import pytest

from okx_codex_trader.live_execution import TargetPosition
from okx_codex_trader.models import Candle
from scripts.run_bb_squeeze_executor import EMPTY_STATE, aligned_frame_from_candles, refresh_live_frame, run_once, save_state, signal_from_frame, strategy_name


def candles_with_latest_breakout() -> list[Candle]:
    candles = []
    price = 100.0
    for index in range(1_001):
        if index == 1_000:
            price = 101.5
        candles.append(
            Candle(
                symbol="ETH-USDT-SWAP",
                ts=1_700_000_000_000 + (index * 900_000),
                open=price,
                high=price,
                low=price,
                close=price,
                volume=1_000.0,
            )
        )
    return candles


def btc_up_candles(timestamps: list[int]) -> list[Candle]:
    return [
        Candle(
            symbol="BTC-USDT-SWAP",
            ts=ts,
            open=100.0 + index * 0.01,
            high=100.0 + index * 0.01,
            low=100.0 + index * 0.01,
            close=100.0 + index * 0.01,
            volume=1_000.0,
        )
        for index, ts in enumerate(timestamps)
    ]


def btc_down_candles(timestamps: list[int]) -> list[Candle]:
    return [
        Candle(
            symbol="BTC-USDT-SWAP",
            ts=ts,
            open=200.0 - index * 0.01,
            high=200.0 - index * 0.01,
            low=200.0 - index * 0.01,
            close=200.0 - index * 0.01,
            volume=1_000.0,
        )
        for index, ts in enumerate(timestamps)
    ]


def live_frame(candles: list[Candle]):
    return aligned_frame_from_candles(candles, btc_up_candles([candle.ts for candle in candles]))


def test_strategy_name_matches_live_parameters() -> None:
    assert strategy_name() == (
        "bb-rr-time-l96-bw960-q0.25-sl0.01-rr3-hybrid_signal_rr-both-btc-up-"
        "vc0.006-ddnone-cd24-mxbuf0.001-mxc1-entryweekday-openexitskip-be0.008-0.001"
    )


def test_signal_uses_latest_confirmed_candle() -> None:
    candles = candles_with_latest_breakout()
    frame = live_frame(candles)

    next_state, signal = signal_from_frame(frame, EMPTY_STATE)

    assert signal["decision_candle_ts"] == candles[-1].ts
    assert next_state.last_candle_ts == candles[-1].ts


def test_seen_latest_candle_replays_without_order_signal() -> None:
    candles = candles_with_latest_breakout()
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, last_candle_ts=candles[-1].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["decision_candle_ts"] == candles[-1].ts
    assert signal["signal"] == "state_replay"


def test_loop_predicate_skips_seen_decision_candle() -> None:
    candles = candles_with_latest_breakout()
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, last_candle_ts=candles[-1].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "state_replay"


def test_refresh_live_frame_fetches_recent_candles_after_initial_load() -> None:
    class Client:
        def __init__(self) -> None:
            self.limits = []

        def get_candles(self, symbol: str, bar: str, limit: int) -> list[Candle]:
            self.limits.append(limit)
            return candles_with_latest_breakout()

        def get_recent_candles(self, symbol: str, bar: str, limit: int) -> list[Candle]:
            self.limits.append(limit)
            candles = candles_with_latest_breakout()
            return [
                *candles[-19:],
                Candle(
                    symbol="ETH-USDT-SWAP",
                    ts=candles[-1].ts + 900_000,
                    open=102.0,
                    high=102.0,
                    low=102.0,
                    close=102.0,
                    volume=1_000.0,
                ),
            ]

    client = Client()
    initial = refresh_live_frame(client, None)
    refreshed = refresh_live_frame(client, initial)

    assert client.limits == [1_200, 1_200, 20, 20]
    assert int(refreshed.iloc[-1]["ts"]) == int(initial.iloc[-1]["ts"]) + 900_000


def middle_exit_candles(close_multiplier: float) -> list[Candle]:
    candles = []
    for index in range(1_001):
        close = 100.0
        if index == 1_000:
            close = 100.0 * close_multiplier
        candles.append(
            Candle(
                symbol="ETH-USDT-SWAP",
                ts=1_700_000_000_000 + (index * 900_000),
                open=close,
                high=close,
                low=close,
                close=close,
                volume=1_000.0,
            )
        )
    return candles


def shift_candles(candles: list[Candle], offset_ms: int) -> list[Candle]:
    return [
        Candle(candle.symbol, candle.ts + offset_ms, candle.open, candle.high, candle.low, candle.close, candle.volume)
        for candle in candles
    ]


def test_short_middle_exit_requires_buffer_break() -> None:
    candles = middle_exit_candles(1.0004)
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="short", entry_price=101.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "hold"
    assert signal["target_side"] == "short"


def test_short_middle_exit_triggers_after_buffer_break() -> None:
    candles = shift_candles(middle_exit_candles(1.002), 12 * 3_600_000)
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="short", entry_price=101.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "exit_middle"
    assert signal["target_side"] == "flat"


def test_us_open_middle_exit_is_skipped() -> None:
    candles = middle_exit_candles(1.001)
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="short", entry_price=101.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "hold"
    assert signal["target_side"] == "short"


def test_long_take_profit_triggers_exit() -> None:
    candles = middle_exit_candles(1.0)
    candles[-1] = Candle(
        symbol="ETH-USDT-SWAP",
        ts=candles[-1].ts,
        open=100.0,
        high=103.1,
        low=100.0,
        close=102.0,
        volume=1_000.0,
    )
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="long", entry_price=100.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts)

    _, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "exit_take_profit"
    assert signal["target_side"] == "flat"


def test_long_breakeven_protection_updates_after_favorable_move() -> None:
    candles = middle_exit_candles(1.0)
    candles[-1] = Candle(
        symbol="ETH-USDT-SWAP",
        ts=candles[-1].ts,
        open=100.0,
        high=100.9,
        low=100.0,
        close=100.4,
        volume=1_000.0,
    )
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="long", entry_price=100.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts, max_favorable_move_pct=0.0)

    next_state, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "hold"
    assert next_state.max_favorable_move_pct == pytest.approx(0.009)


def test_long_breakeven_protection_triggers_exit_after_prior_favorable_move() -> None:
    candles = middle_exit_candles(1.0)
    candles[-1] = Candle(
        symbol="ETH-USDT-SWAP",
        ts=candles[-1].ts,
        open=100.4,
        high=100.5,
        low=100.05,
        close=100.2,
        volume=1_000.0,
    )
    frame = live_frame(candles)
    state = replace(EMPTY_STATE, active_side="long", entry_price=100.0, entry_candle_ts=candles[-2].ts, last_candle_ts=candles[-2].ts, max_favorable_move_pct=0.008)

    next_state, signal = signal_from_frame(frame, state)

    assert signal["signal"] == "exit_breakeven"
    assert signal["target_side"] == "flat"
    assert next_state.active_side is None


def test_btc_down_filter_blocks_new_breakout_entry() -> None:
    candles = candles_with_latest_breakout()
    frame = aligned_frame_from_candles(candles, btc_down_candles([candle.ts for candle in candles]))

    _, signal = signal_from_frame(frame, EMPTY_STATE)

    assert signal["signal"] == "hold"
    assert signal["target_side"] == "flat"


def test_run_once_syncs_external_flat_without_reopening(monkeypatch, tmp_path) -> None:
    frame = live_frame(middle_exit_candles(0.999))
    state_dir = tmp_path / "state"
    previous = replace(
        EMPTY_STATE,
        active_side="short",
        entry_price=101.0,
        entry_candle_ts=int(frame.iloc[-2]["ts"]),
        last_candle_ts=int(frame.iloc[-2]["ts"]),
        middle_exit_streak=0,
    )
    save_state(state_dir / "runtime-state.json", previous)

    monkeypatch.setattr("scripts.run_bb_squeeze_executor.load_config", lambda: object())
    monkeypatch.setattr(
        "scripts.run_bb_squeeze_executor.account_current_position",
        lambda client, margin: (
            TargetPosition(side="flat", unit=0.0, known=True, reason="no open OKX position", contracts=0.0),
            {"positions": [], "instrument_meta": {"ct_val": 0.1, "lot_sz": 0.01, "min_sz": 0.01}, "mark_price": 100.0},
        ),
    )

    snapshot = run_once(
        state_dir=state_dir,
        margin_per_unit_usdt=100.0,
        max_new_margin_usdt=100.0,
        max_total_margin_usdt=200.0,
        submit_live=False,
        frame=frame,
    )

    assert snapshot["signal"]["signal"] == "external_flat_sync"
    assert snapshot["target_position"]["side"] == "flat"
    assert snapshot["rendered_orders"] == []
    assert snapshot["next_state"]["active_side"] is None