"""Centralized configuration for the Village Simulation."""

from dataclasses import dataclass, field, asdict
from typing import Optional
import json
from pathlib import Path


@dataclass
class AgentStatsConfig:
    """Configuration for agent vital stats."""
    # Maximum values
    max_energy: int = 50
    max_hunger: int = 100
    max_thirst: int = 100  # Increased from 50 to give more buffer
    max_heat: int = 100
    
    # Starting values
    start_energy: int = 50
    start_hunger: int = 80
    start_thirst: int = 80  # Increased from 40 to start with more buffer
    start_heat: int = 100
    
    # Decay rates per turn
    energy_decay: int = 2
    hunger_decay: int = 2
    thirst_decay: int = 2  # Reduced from 3 to match hunger decay rate
    heat_decay: int = 2
    
    # Thresholds
    critical_threshold: float = 0.25  # 25% triggers survival mode
    low_energy_threshold: int = 15    # Minimum energy to work


@dataclass
class ResourceConfig:
    """Configuration for resource properties."""
    # Decay rates (turns until spoilage, 0 = infinite)
    meat_decay: int = 8   # Increased from 5 to give more time to use
    berries_decay: int = 25
    clothes_decay: int = 50
    
    # Resource effects
    meat_hunger: int = 30
    meat_energy: int = 5
    berries_hunger: int = 8   # Increased from 5
    berries_thirst: int = 3   # Increased from 2
    water_thirst: int = 50    # Increased from 40 for better thirst recovery
    fire_heat: int = 15       # Increased from 10


@dataclass
class ActionConfig:
    """Configuration for action costs and outcomes."""
    # Energy costs (positive = restore, negative = spend)
    sleep_energy: int = 60
    rest_energy: int = 10
    hunt_energy: int = -15
    gather_energy: int = -5
    chop_wood_energy: int = -10
    get_water_energy: int = -5
    weave_energy: int = -8
    build_fire_energy: int = -5
    trade_energy: int = -1
    
    # Success chances (0.0 to 1.0)
    hunt_success: float = 0.7
    chop_wood_success: float = 0.9
    
    # Output quantities
    hunt_meat_min: int = 1
    hunt_meat_max: int = 3
    hunt_hide_min: int = 0
    hunt_hide_max: int = 1
    gather_min: int = 2
    gather_max: int = 5
    chop_wood_min: int = 1
    chop_wood_max: int = 2


@dataclass
class WorldConfig:
    """Configuration for world properties."""
    width: int = 20
    height: int = 20
    initial_agents: int = 8
    day_steps: int = 10
    night_steps: int = 1
    
    # Agent configuration
    inventory_slots: int = 10
    starting_money: int = 100


@dataclass
class MarketConfig:
    """Configuration for market behavior."""
    turns_before_discount: int = 3
    discount_rate: float = 0.15  # 15% discount after waiting
    base_price_multiplier: float = 1.2  # Markup over production cost


@dataclass
class EconomyConfig:
    """Configuration for economic behavior and agent trading.
    
    These values control how agents perceive the value of money and trading.
    Higher values make agents more trade-oriented.
    """
    # How much agents value money vs energy
    # Higher = agents see money as more valuable (trade more)
    energy_to_money_ratio: float = 1.5  # 1 energy ≈ 1.5 coins
    
    # How strongly agents desire wealth (0-1)
    # Higher = agents will prioritize building wealth
    wealth_desire: float = 0.3
    
    # Buy efficiency threshold (0-1)
    # If market price < (threshold * fair_value), buy instead of gather
    # 0.7 means: buy if price is 70% or less of the fair value
    buy_efficiency_threshold: float = 0.7
    
    # Minimum wealth target - agents want at least this much money
    min_wealth_target: int = 50
    
    # Price adjustment limits
    max_price_markup: float = 2.0      # Maximum price = 2x base value
    min_price_discount: float = 0.5    # Minimum price = 50% of base value


@dataclass
class SimulationConfig:
    """Master configuration containing all sub-configs."""
    agent_stats: AgentStatsConfig = field(default_factory=AgentStatsConfig)
    resources: ResourceConfig = field(default_factory=ResourceConfig)
    actions: ActionConfig = field(default_factory=ActionConfig)
    world: WorldConfig = field(default_factory=WorldConfig)
    market: MarketConfig = field(default_factory=MarketConfig)
    economy: EconomyConfig = field(default_factory=EconomyConfig)
    
    # Simulation control
    auto_step_interval: float = 1.0  # Seconds between auto steps
    
    def to_dict(self) -> dict:
        """Convert to dictionary."""
        return {
            "agent_stats": asdict(self.agent_stats),
            "resources": asdict(self.resources),
            "actions": asdict(self.actions),
            "world": asdict(self.world),
            "market": asdict(self.market),
            "economy": asdict(self.economy),
            "auto_step_interval": self.auto_step_interval,
        }
    
    @classmethod
    def from_dict(cls, data: dict) -> "SimulationConfig":
        """Create from dictionary."""
        return cls(
            agent_stats=AgentStatsConfig(**data.get("agent_stats", {})),
            resources=ResourceConfig(**data.get("resources", {})),
            actions=ActionConfig(**data.get("actions", {})),
            world=WorldConfig(**data.get("world", {})),
            market=MarketConfig(**data.get("market", {})),
            economy=EconomyConfig(**data.get("economy", {})),
            auto_step_interval=data.get("auto_step_interval", 1.0),
        )
    
    def save(self, path: str = "config.json") -> None:
        """Save configuration to JSON file."""
        with open(path, "w") as f:
            json.dump(self.to_dict(), f, indent=2)
    
    @classmethod
    def load(cls, path: str = "config.json") -> "SimulationConfig":
        """Load configuration from JSON file."""
        try:
            with open(path, "r") as f:
                data = json.load(f)
            return cls.from_dict(data)
        except FileNotFoundError:
            return cls()  # Return defaults if file not found


# Global configuration instance
_config: Optional[SimulationConfig] = None


def get_config() -> SimulationConfig:
    """Get the global configuration instance.
    
    Loads from config.json if not already loaded.
    """
    global _config
    if _config is None:
        _config = load_config()
    return _config


def load_config(path: str = "config.json") -> SimulationConfig:
    """Load configuration from JSON file, falling back to defaults."""
    try:
        config_path = Path(path)
        if not config_path.is_absolute():
            # Try relative to workspace root (villsim/)
            # __file__ is backend/config.py, so .parent.parent is villsim/
            workspace_root = Path(__file__).parent.parent
            config_path = workspace_root / path

        if config_path.exists():
            with open(config_path, "r") as f:
                data = json.load(f)
            return SimulationConfig.from_dict(data)
    except (FileNotFoundError, json.JSONDecodeError) as e:
        print(f"Warning: Could not load config from {path}: {e}")

    return SimulationConfig()  # Return defaults if file not found


def set_config(config: SimulationConfig) -> None:
    """Set the global configuration instance."""
    global _config
    _config = config


def reset_config() -> SimulationConfig:
    """Reset configuration to defaults."""
    global _config
    _config = SimulationConfig()
    _reset_all_caches()
    return _config


def reload_config(path: str = "config.json") -> SimulationConfig:
    """Reload configuration from file and reset all caches."""
    global _config
    _config = load_config(path)
    _reset_all_caches()
    return _config


def _reset_all_caches() -> None:
    """Reset all module caches that depend on config values."""
    try:
        from backend.domain.action import reset_action_config_cache
        reset_action_config_cache()
    except ImportError:
        pass
    
    try:
        from backend.domain.resources import reset_resource_cache
        reset_resource_cache()
    except ImportError:
        pass