"""Confluence checker for ICT signals.

Evaluates whether enough ICT conditions align (minimum 3 out of 6)
to produce a valid trade signal.
"""

from __future__ import annotations

from dataclasses import dataclass, field
from typing import List

import pandas as pd
from loguru import logger

from config import settings
from indicators.ict_engine import ICTSignals
from indicators.multi_timeframe import (
    MarketBias,
    MTFAnalysis,
    TradeDirection,
    TradeZone,
)


@dataclass
class ConditionResult:
    """Result for a single confluence condition."""

    name: str
    met: bool
    detail: str = ""


@dataclass
class ConfluenceResult:
    """Aggregated confluence evaluation."""

    score: int
    conditions: List[ConditionResult] = field(default_factory=list)
    is_valid: bool = False
    direction: TradeDirection = TradeDirection.NONE

    def summary(self) -> str:
        met = [c.name for c in self.conditions if c.met]
        return f"Score {self.score}/6 ({', '.join(met)})"


class ConfluenceChecker:
    """Check if enough ICT conditions align for a trade entry.

    Six conditions are evaluated:
      1. Market Structure (HTF bias alignment)
      2. Liquidity Sweep (sweep then reversal)
      3. Order Block (price in OB zone)
      4. Fair Value Gap (price in FVG)
      5. BOS (break of structure confirmation)
      6. CHOCH (change of character confirmation)
    """

    MIN_CONFLUENCE = settings.MIN_CONFLUENCE_SCORE

    def check(
        self,
        mtf: MTFAnalysis,
        current_price: float,
        htf_signals: ICTSignals | None = None,
        mtf_signals: ICTSignals | None = None,
        ltf_signals: ICTSignals | None = None,
    ) -> ConfluenceResult:
        """Evaluate all six conditions and return the result."""
        conditions: List[ConditionResult] = []
        bias = mtf.htf_bias
        target = 1 if bias == MarketBias.BULLISH else (-1 if bias == MarketBias.BEARISH else 0)

        # 1. Market Structure
        ms_met = bias != MarketBias.NEUTRAL
        conditions.append(
            ConditionResult("Market Structure", ms_met, f"HTF bias: {bias.value}")
        )

        # 2. Liquidity Sweep
        liq_met = False
        try:
            if mtf_signals and not mtf_signals.liquidity.empty:
                liq_col = mtf_signals.liquidity.get("Liquidity", pd.Series(dtype=float))
                swept = liq_col.dropna()
                if len(swept) > 0:
                    val = swept.iloc[-1]
                    if pd.notna(val) and int(val) == target:
                        liq_met = True
        except (ValueError, TypeError):
            pass
        conditions.append(
            ConditionResult("Liquidity Sweep", liq_met)
        )

        # 3. Order Block (price in or near aligned OB)
        ob_met = False
        for zone in mtf.mtf_zones:
            if zone.zone_type == "OB" and zone.direction == target:
                if zone.contains_price(current_price):
                    ob_met = True
                    break
                # Also check proximity (within 0.5% of zone)
                zone_size = zone.top - zone.bottom
                margin = max(zone_size * 0.5, current_price * 0.005)
                if (zone.bottom - margin) <= current_price <= (zone.top + margin):
                    ob_met = True
                    break
        conditions.append(
            ConditionResult(
                "Order Block",
                ob_met,
                "Price in/near aligned OB" if ob_met else "",
            )
        )

        # 4. Fair Value Gap (price in or near aligned FVG)
        fvg_met = False
        for zone in mtf.mtf_zones:
            if zone.zone_type == "FVG" and zone.direction == target:
                if zone.contains_price(current_price):
                    fvg_met = True
                    break
                zone_size = zone.top - zone.bottom
                margin = max(zone_size * 0.5, current_price * 0.005)
                if (zone.bottom - margin) <= current_price <= (zone.top + margin):
                    fvg_met = True
                    break
        conditions.append(
            ConditionResult(
                "Fair Value Gap",
                fvg_met,
                "Price in/near aligned FVG" if fvg_met else "",
            )
        )

        # 5. BOS confirmation
        bos_met = False
        if ltf_signals:
            bos_met = ltf_signals.latest_bos == target
        conditions.append(
            ConditionResult("BOS", bos_met)
        )

        # 6. CHOCH confirmation
        choch_met = False
        if ltf_signals:
            choch_met = ltf_signals.latest_choch == target
        elif mtf_signals:
            choch_met = mtf_signals.latest_choch == target
        conditions.append(
            ConditionResult("CHOCH", choch_met)
        )

        score = sum(1 for c in conditions if c.met)
        direction = (
            TradeDirection.LONG
            if target == 1
            else TradeDirection.SHORT
            if target == -1
            else TradeDirection.NONE
        )
        is_valid = score >= self.MIN_CONFLUENCE and direction != TradeDirection.NONE

        result = ConfluenceResult(
            score=score,
            conditions=conditions,
            is_valid=is_valid,
            direction=direction,
        )
        logger.info("Confluence check: {}", result.summary())
        return result