"""
state.py — Account state and position/order field helpers.
===========================================================
Holds the current snapshot of the account, positions, and orders.
Updated every loop from the API. All other modules read from here.

FIELD ACCESS HELPERS:
---------------------
Capital.com uses nested dicts with non-obvious field names.
Rather than repeating o["workingOrderData"]["orderLevel"] everywhere,
use the helper functions at the bottom of this file:
  pos_level(p)  → float entry price of a position
  pos_size(p)   → float size in shares
  pos_id(p)     → deal ID string
  pos_tp(p)     → take profit price (float) or None if not set
  pos_upl(p)    → unrealised P&L in USD (float)
  ord_level(o)  → float entry price of a working order
  ord_size(o)   → float size in shares
  ord_id(o)     → deal ID string
"""

import logging
import config

log = logging.getLogger("maxbot.state")


# ─────────────────────────────────────────────
#  FIELD ACCESS HELPERS
#  Use these everywhere instead of raw dict access.
#  If Capital.com ever changes field names, fix it here only.
# ─────────────────────────────────────────────

def pos_level(p) -> float:
    return float(p["position"]["level"])

def pos_size(p) -> float:
    return float(p["position"]["size"])

def pos_id(p) -> str:
    return p["position"]["dealId"]

def pos_tp(p):
    """Returns take profit price as float, or None if not set."""
    tp = p["position"].get("profitLevel")
    return float(tp) if tp is not None else None

def pos_upl(p) -> float:
    """Unrealised P&L in USD."""
    return float(p["position"].get("upl", 0))

def ord_level(o) -> float:
    return float(o["workingOrderData"]["orderLevel"])

def ord_size(o) -> float:
    return float(o["workingOrderData"]["orderSize"])

def ord_id(o) -> str:
    return o["workingOrderData"]["dealId"]


# ─────────────────────────────────────────────
#  BOT STATE
# ─────────────────────────────────────────────

class BotState:
    """
    Snapshot of the account updated every loop.
    All values are recalculated from scratch each time fetch() is called.
    """

    def __init__(self):
        self.positions:    list  = []
        self.orders:       list  = []
        self.equity:       float = 0.0   # running equity in GBP
        self.funds:        float = 0.0   # deposited funds in GBP
        self.available:    float = 0.0   # available to trade in GBP
        self.current_price: float = 0.0  # TSLA mid price in USD
        self.gbpusd:       float = config.GBPUSD_FALLBACK
        self.highest_open_price: float = 0.0  # highest open position entry
        self.lowest_level_price: float = 0.0  # lowest of positions OR orders
        self.total_margin_gbp:   float = 0.0  # estimated margin in use
        self.margin_level_pct:   float = 999.0
        self.last_price:   float = None  # previous loop price (gap detection)

    def update(self, positions, orders, account, price_data, gbpusd):
        """Recalculate all state from fresh API data."""
        self.positions = positions
        self.orders    = orders
        self.gbpusd    = gbpusd

        # Account balance
        for acc in account.get("accounts", []):
            if acc.get("preferred"):
                bal = acc.get("balance", {})
                self.equity    = float(bal.get("balance",   0))
                self.funds     = float(bal.get("deposit",   0))
                self.available = float(bal.get("available", 0))
                break

        # Current TSLA mid price
        snap = price_data.get("snapshot", {})
        self.current_price = (
            float(snap.get("bid",   0)) +
            float(snap.get("offer", 0))
        ) / 2.0

        # Highest open position entry price
        open_prices = [pos_level(p) for p in positions]
        self.highest_open_price = (
            max(open_prices) if open_prices else self.current_price
        )

        # Lowest level across all positions and orders
        order_prices = [ord_level(o) for o in orders]
        all_prices   = open_prices + order_prices
        self.lowest_level_price = (
            min(all_prices) if all_prices else self.current_price
        )

        # Approximate total margin in use (GBP)
        # Formula: entry_price * size * margin_rate / gbpusd
        self.total_margin_gbp = sum(
            pos_level(p) * pos_size(p) * config.MARGIN_RATE / gbpusd
            for p in positions
        )

        # Margin level % = equity / margin * 100
        self.margin_level_pct = (
            (self.equity / self.total_margin_gbp * 100)
            if self.total_margin_gbp > 0 else 999.0
        )

    def positions_sorted_asc(self) -> list:
        """Open positions sorted by entry price, lowest first."""
        return sorted(self.positions, key=pos_level)

    def orders_sorted_asc(self) -> list:
        """Pending orders sorted by level, lowest first."""
        return sorted(self.orders, key=ord_level)

    def all_levels(self) -> list:
        """
        Combined list of all open positions and pending orders
        as dicts with 'price' and 'size' keys.
        Used by the survival check calculator.
        """
        levels = []
        for p in self.positions:
            levels.append({"price": pos_level(p), "size": pos_size(p)})
        for o in self.orders:
            levels.append({"price": ord_level(o), "size": ord_size(o)})
        return levels