"""
Standalone game logic for the API.
Contains all game mechanics without bot dependencies.
"""
import random
import time
from typing import Dict, Any, Tuple, Optional, List
from . import database as db


async def move_player(player_id: int, direction: str, locations: Dict) -> Tuple[bool, str, Optional[str], int, int]:
    """
    Move player in a direction.
    Returns: (success, message, new_location_id, stamina_cost, distance_meters)
    """
    player = await db.get_player_by_id(player_id)
    if not player:
        return False, "Player not found", None, 0, 0
    
    current_location_id = player['location_id']
    current_location = locations.get(current_location_id)
    
    if not current_location:
        return False, "Current location not found", None, 0, 0
    
    # Check if direction is valid
    if direction not in current_location.exits:
        return False, f"You cannot go {direction} from here.", None, 0, 0
    
    new_location_id = current_location.exits[direction]
    new_location = locations.get(new_location_id)
    
    if not new_location:
        return False, "Destination not found", None, 0, 0
    
    # Calculate total weight
    from api.items import items_manager as ITEMS_MANAGER
    
    inventory = await db.get_inventory(player_id)
    total_weight = 0.0
    for inv_item in inventory:
        item = ITEMS_MANAGER.get_item(inv_item['item_id'])
        if item:
            total_weight += item.weight * inv_item['quantity']
    
    # Calculate distance between locations (1 coordinate unit = 100 meters)
    import math
    coord_distance = math.sqrt(
        (new_location.x - current_location.x)**2 + 
        (new_location.y - current_location.y)**2
    )
    distance = int(coord_distance * 100)  # Convert to meters, round to integer
    
    # Calculate stamina cost: base from distance, adjusted by weight and agility
    base_cost = max(1, round(distance / 50))  # 50m = 1 stamina
    weight_penalty = int(total_weight / 10)
    agility_reduction = int(player.get('agility', 5) / 3)
    stamina_cost = max(1, base_cost + weight_penalty - agility_reduction)
    
    # Check stamina
    if player['stamina'] < stamina_cost:
        return False, "You're too exhausted to move. Wait for your stamina to regenerate.", None, 0, 0
    
    # Update player location and stamina
    await db.update_player(
        player_id,
        location_id=new_location_id,
        stamina=max(0, player['stamina'] - stamina_cost)
    )
    
    return True, f"You travel {direction} to {new_location.name}.", new_location_id, stamina_cost, distance


async def inspect_area(player_id: int, location, interactables_data: Dict) -> str:
    """
    Inspect the current area and return detailed information.
    Returns formatted text with interactables and their actions.
    """
    player = await db.get_player_by_id(player_id)
    if not player:
        return "Player not found"
    
    # Check if player has enough stamina
    if player['stamina'] < 1:
        return "You're too exhausted to inspect the area thoroughly. Wait for your stamina to regenerate."
    
    # Deduct stamina
    await db.update_player_stamina(player_id, player['stamina'] - 1)
    
    # Build inspection message
    lines = [f"🔍 **Inspecting {location.name}**\n"]
    lines.append(location.description)
    lines.append("")
    
    if location.interactables:
        lines.append("**Interactables:**")
        for interactable in location.interactables:
            lines.append(f"• **{interactable.name}**")
            if interactable.actions:
                actions_text = ", ".join([f"{action.label} (⚡{action.stamina_cost})" for action in interactable.actions])
                lines.append(f"  Actions: {actions_text}")
        lines.append("")
    
    if location.npcs:
        lines.append(f"**NPCs:** {', '.join(location.npcs)}")
        lines.append("")
    
    # Check for dropped items
    dropped_items = await db.get_dropped_items(location.id)
    if dropped_items:
        lines.append("**Items on ground:**")
        for item in dropped_items:
            lines.append(f"• {item['item_id']} x{item['quantity']}")
    
    return "\n".join(lines)


async def interact_with_object(
    player_id: int,
    interactable_id: str,
    action_id: str,
    location,
    items_manager
) -> Dict[str, Any]:
    """
    Interact with an object using a specific action.
    Returns: {success, message, items_found, damage_taken, stamina_cost}
    """
    player = await db.get_player_by_id(player_id)
    if not player:
        return {"success": False, "message": "Player not found"}
    
    # Find the interactable
    interactable = None
    for obj in location.interactables:
        if obj.id == interactable_id:
            interactable = obj
            break
    
    if not interactable:
        return {"success": False, "message": "Object not found"}
    
    # Find the action
    action = None
    for act in interactable.actions:
        if act.id == action_id:
            action = act
            break
    
    if not action:
        return {"success": False, "message": "Action not found"}
    
    # Check stamina
    if player['stamina'] < action.stamina_cost:
        return {
            "success": False,
            "message": f"Not enough stamina. Need {action.stamina_cost}, have {player['stamina']}."
        }
    
    # Check cooldown
    cooldown_expiry = await db.get_interactable_cooldown(interactable_id)
    if cooldown_expiry:
        remaining = int(cooldown_expiry - time.time())
        return {
            "success": False,
            "message": f"This object is still recovering. Wait {remaining} seconds."
        }
    
    # Deduct stamina
    new_stamina = player['stamina'] - action.stamina_cost
    await db.update_player_stamina(player_id, new_stamina)
    
    # Determine outcome (simple success/failure for now)
    # TODO: Implement proper skill checks
    roll = random.randint(1, 100)
    
    if roll <= 10:  # 10% critical failure
        outcome_key = 'critical_failure'
    elif roll <= 30:  # 20% failure
        outcome_key = 'failure'
    else:  # 70% success
        outcome_key = 'success'
    
    outcome = action.outcomes.get(outcome_key)
    if not outcome:
        # Fallback to success if outcome not defined
        outcome = action.outcomes.get('success')
    
    if not outcome:
        return {
            "success": False,
            "message": "Action has no defined outcomes"
        }
    
    # Process outcome
    items_found = []
    items_dropped = []
    damage_taken = outcome.damage_taken
    
    # Calculate current capacity
    from api.main import calculate_player_capacity
    current_weight, max_weight, current_volume, max_volume = await calculate_player_capacity(player_id)
    
    # Add items to inventory (or drop if over capacity)
    for item_id, quantity in outcome.items_reward.items():
        item = items_manager.get_item(item_id)
        if not item:
            continue
        
        item_name = item.name if item else item_id
        emoji = item.emoji if item and hasattr(item, 'emoji') else ''
        
        # Check if item has durability (unique item)
        has_durability = hasattr(item, 'durability') and item.durability is not None
        
        # For items with durability, we need to create each one individually
        if has_durability:
            for _ in range(quantity):
                # Check if item fits in inventory
                if (current_weight + item.weight <= max_weight and 
                    current_volume + item.volume <= max_volume):
                    # Add to inventory with durability properties
                    await db.add_item_to_inventory(
                        player_id, 
                        item_id, 
                        quantity=1,
                        durability=item.durability,
                        max_durability=item.durability,
                        tier=getattr(item, 'tier', None)
                    )
                    items_found.append(f"{emoji} {item_name}")
                    current_weight += item.weight
                    current_volume += item.volume
                else:
                    # Create unique_item and drop to ground
                    unique_item_id = await db.create_unique_item(
                        item_id=item_id,
                        durability=item.durability,
                        max_durability=item.durability,
                        tier=getattr(item, 'tier', None)
                    )
                    await db.drop_item_to_world(item_id, 1, player['location_id'], unique_item_id=unique_item_id)
                    items_dropped.append(f"{emoji} {item_name}")
        else:
            # Stackable items - process as before
            item_weight = item.weight * quantity
            item_volume = item.volume * quantity
            
            if (current_weight + item_weight <= max_weight and 
                current_volume + item_volume <= max_volume):
                # Add to inventory
                await db.add_item_to_inventory(player_id, item_id, quantity)
                items_found.append(f"{emoji} {item_name} x{quantity}")
                current_weight += item_weight
                current_volume += item_volume
            else:
                # Drop to ground
                await db.drop_item_to_world(item_id, quantity, player['location_id'])
                items_dropped.append(f"{emoji} {item_name} x{quantity}")
    
    # Apply damage
    if damage_taken > 0:
        new_hp = max(0, player['hp'] - damage_taken)
        await db.update_player_hp(player_id, new_hp)
        
        # Check if player died
        if new_hp <= 0:
            await db.update_player(player_id, is_dead=True)
    
    # Set cooldown (60 seconds default)
    await db.set_interactable_cooldown(interactable_id, 60)
    
    # Build message
    final_message = outcome.text
    if items_dropped:
        final_message += f"\n⚠️ Inventory full! Dropped to ground: {', '.join(items_dropped)}"
    
    return {
        "success": True,
        "message": final_message,
        "items_found": items_found,
        "items_dropped": items_dropped,
        "damage_taken": damage_taken,
        "stamina_cost": action.stamina_cost,
        "new_stamina": new_stamina,
        "new_hp": player['hp'] - damage_taken if damage_taken > 0 else player['hp']
    }


async def use_item(player_id: int, item_id: str, items_manager) -> Dict[str, Any]:
    """
    Use an item from inventory.
    Returns: {success, message, effects}
    """
    player = await db.get_player_by_id(player_id)
    if not player:
        return {"success": False, "message": "Player not found"}
    
    # Check if player has the item
    inventory = await db.get_inventory(player_id)
    item_entry = None
    for inv_item in inventory:
        if inv_item['item_id'] == item_id:
            item_entry = inv_item
            break
    
    if not item_entry:
        return {"success": False, "message": "You don't have this item"}
    
    # Get item data
    item = items_manager.get_item(item_id)
    if not item:
        return {"success": False, "message": "Item not found in game data"}
    
    if not item.consumable:
        return {"success": False, "message": "This item cannot be used"}
    
    # Apply item effects
    effects = {}
    effects_msg = []
    
    if 'hp_restore' in item.effects:
        hp_restore = item.effects['hp_restore']
        old_hp = player['hp']
        new_hp = min(player['max_hp'], old_hp + hp_restore)
        actual_restored = new_hp - old_hp
        if actual_restored > 0:
            await db.update_player_hp(player_id, new_hp)
            effects['hp_restored'] = actual_restored
            effects_msg.append(f"+{actual_restored} HP")
    
    if 'stamina_restore' in item.effects:
        stamina_restore = item.effects['stamina_restore']
        old_stamina = player['stamina']
        new_stamina = min(player['max_stamina'], old_stamina + stamina_restore)
        actual_restored = new_stamina - old_stamina
        if actual_restored > 0:
            await db.update_player_stamina(player_id, new_stamina)
            effects['stamina_restored'] = actual_restored
            effects_msg.append(f"+{actual_restored} Stamina")
    
    # Consume the item (remove 1 from inventory)
    await db.remove_item_from_inventory(player_id, item_id, 1)
    
    # Track statistics
    stat_updates = {"items_used": 1, "increment": True}
    if 'hp_restored' in effects:
        stat_updates['hp_restored'] = effects['hp_restored']
    if 'stamina_restored' in effects:
        stat_updates['stamina_restored'] = effects['stamina_restored']
    await db.update_player_statistics(player_id, **stat_updates)
    
    # Build message
    msg = f"Used {item.name}"
    if effects_msg:
        msg += f" ({', '.join(effects_msg)})"
    
    return {
        "success": True,
        "message": msg,
        "effects": effects
    }


async def pickup_item(player_id: int, item_id: int, location_id: str, quantity: int = None, items_manager=None) -> Dict[str, Any]:
    """
    Pick up an item from the ground.
    item_id is the dropped_item id, not the item_id field.
    quantity: how many to pick up (None = all)
    items_manager: ItemsManager instance to get item definitions
    Returns: {success, message}
    """
    # Get the dropped item by its ID
    dropped_item = await db.get_dropped_item(item_id)
    
    if not dropped_item:
        return {"success": False, "message": "Item not found on ground"}
    
    # Get item definition
    item_def = items_manager.get_item(dropped_item['item_id']) if items_manager else None
    if not item_def:
        return {"success": False, "message": "Item data not found"}
    
    # Determine how many to pick up
    available_qty = dropped_item['quantity']
    if quantity is None or quantity >= available_qty:
        pickup_qty = available_qty
    else:
        if quantity < 1:
            return {"success": False, "message": "Invalid quantity"}
        pickup_qty = quantity
    
    # Get player and calculate capacity
    player = await db.get_player_by_id(player_id)
    inventory = await db.get_inventory(player_id)
    
    # Calculate current weight and volume (including equipped bag capacity)
    current_weight = 0.0
    current_volume = 0.0
    max_weight = 10.0  # Base capacity
    max_volume = 10.0  # Base capacity
    
    for inv_item in inventory:
        inv_item_def = items_manager.get_item(inv_item['item_id']) if items_manager else None
        if inv_item_def:
            current_weight += inv_item_def.weight * inv_item['quantity']
            current_volume += inv_item_def.volume * inv_item['quantity']
            
            # Check for equipped bags/containers that increase capacity
            if inv_item['is_equipped'] and inv_item_def.stats:
                max_weight += inv_item_def.stats.get('weight_capacity', 0)
                max_volume += inv_item_def.stats.get('volume_capacity', 0)
    
    # Calculate weight and volume for items to pick up
    item_weight = item_def.weight * pickup_qty
    item_volume = item_def.volume * pickup_qty
    new_weight = current_weight + item_weight
    new_volume = current_volume + item_volume
    
    # Check limits
    if new_weight > max_weight:
        return {
            "success": False, 
            "message": f"⚠️ Item too heavy! {item_def.emoji} {item_def.name} x{pickup_qty} ({item_weight:.1f}kg) would exceed capacity. Current: {current_weight:.1f}/{max_weight:.1f}kg"
        }
    
    if new_volume > max_volume:
        return {
            "success": False, 
            "message": f"⚠️ Item too large! {item_def.emoji} {item_def.name} x{pickup_qty} ({item_volume:.1f}L) would exceed capacity. Current: {current_volume:.1f}/{max_volume:.1f}L"
        }
    
    # Items fit - update dropped item quantity or remove it
    if pickup_qty >= available_qty:
        await db.remove_dropped_item(item_id)
    else:
        new_qty = available_qty - pickup_qty
        await db.update_dropped_item_quantity(item_id, new_qty)
    
    # Add to inventory (pass unique_item_id if it's a unique item)
    await db.add_item_to_inventory(
        player_id, 
        dropped_item['item_id'], 
        pickup_qty,
        unique_item_id=dropped_item.get('unique_item_id')
    )
    
    return {
        "success": True,
        "message": f"Picked up {item_def.emoji} {item_def.name} x{pickup_qty}"
    }


async def check_and_apply_level_up(player_id: int) -> Dict[str, Any]:
    """
    Check if player has enough XP to level up and apply it.
    Returns: {leveled_up: bool, new_level: int, levels_gained: int}
    """
    player = await db.get_player_by_id(player_id)
    if not player:
        return {"leveled_up": False, "new_level": 1, "levels_gained": 0}
    
    current_level = player['level']
    current_xp = player['xp']
    levels_gained = 0
    
    # Check for level ups (can level up multiple times if enough XP)
    while current_xp >= (current_level * 100):
        current_xp -= (current_level * 100)
        current_level += 1
        levels_gained += 1
    
    if levels_gained > 0:
        # Update player with new level, remaining XP, and unspent points
        new_unspent_points = player['unspent_points'] + levels_gained
        await db.update_player(
            player_id,
            level=current_level,
            xp=current_xp,
            unspent_points=new_unspent_points
        )
        
        return {
            "leveled_up": True,
            "new_level": current_level,
            "levels_gained": levels_gained
        }
    
    return {"leveled_up": False, "new_level": current_level, "levels_gained": 0}


# ============================================================================
# STATUS EFFECTS UTILITIES
# ============================================================================

def calculate_status_damage(effects: list) -> int:
    """
    Calculate total damage from all status effects.
    
    Args:
        effects: List of status effect dicts
    
    Returns:
        Total damage per tick
    """
    return sum(effect.get('damage_per_tick', 0) for effect in effects)