import random
import json
from datetime import datetime
from models import Box

def initialize_game_state(user_id):
    """Initialize game state for a new user"""
    return {
        "user_id": user_id,
        "box": None,
        "coins": 0,
        "wins": 0,
        "losses": 0,
        "inventory": [],
        "created_at": datetime.now().isoformat(),
        "last_login": datetime.now().isoformat()
    }

def create_box(name):
    """Create a new box with random stats"""
    box = Box(name=name)
    
    # Random base stats
    box.attack = random.randint(8, 15)
    box.defense = random.randint(6, 12)
    box.health = random.randint(40, 60)
    box.max_health = box.health
    box.speed = random.randint(3, 8)
    
    # Random ability
    abilities = [
        {"name": "Power Strike", "damage_bonus": 5, "description": "Extra damage on attacks"},
        {"name": "Iron Shield", "defense_bonus": 3, "description": "Better defense"},
        {"name": "Quick Attack", "speed_bonus": 2, "description": "Faster attacks"},
        {"name": "Regeneration", "heal_bonus": 2, "description": "Heals over time"},
        {"name": "Critical Hit", "crit_chance": 0.2, "description": "Chance for double damage"}
    ]
    box.ability = random.choice(abilities)
    
    return box

def calculate_battle_result(attacker, defender):
    """Calculate battle result between two boxes"""
    battle_log = []
    rounds = 0
    max_rounds = 20
    
    attacker_health = attacker.health
    defender_health = defender.health
    
    # Determine who goes first
    attacker_first = attacker.speed >= defender.speed
    
    while attacker_health > 0 and defender_health > 0 and rounds < max_rounds:
        rounds += 1
        battle_log.append(f"\n--- Round {rounds} ---")
        
        if attacker_first:
            # Attacker's turn
            damage = max(1, attacker.attack - defender.defense + random.randint(-2, 3))
            
            # Apply ability bonus
            if "damage_bonus" in attacker.ability:
                damage += attacker.ability["damage_bonus"]
                battle_log.append(f"{attacker.name} uses {attacker.ability['name']}!")
            
            # Critical hit chance
            if "crit_chance" in attacker.ability and random.random() < attacker.ability["crit_chance"]:
                damage *= 2
                battle_log.append(f"💥 CRITICAL HIT!")
            
            defender_health -= damage
            battle_log.append(f"{attacker.name} deals {damage} damage to {defender.name}")
            battle_log.append(f"{defender.name} health: {max(0, defender_health)}/{defender.max_health}")
            
            if defender_health <= 0:
                break
            
            # Defender's turn
            damage = max(1, defender.attack - attacker.defense + random.randint(-2, 3))
            
            # Apply ability bonus
            if "damage_bonus" in defender.ability:
                damage += defender.ability["damage_bonus"]
                battle_log.append(f"{defender.name} uses {defender.ability['name']}!")
            
            # Critical hit chance
            if "crit_chance" in defender.ability and random.random() < defender.ability["crit_chance"]:
                damage *= 2
                battle_log.append(f"💥 CRITICAL HIT!")
            
            attacker_health -= damage
            battle_log.append(f"{defender.name} deals {damage} damage to {attacker.name}")
            battle_log.append(f"{attacker.name} health: {max(0, attacker_health)}/{attacker.max_health}")
        else:
            # Defender goes first (same logic as above but reversed)
            damage = max(1, defender.attack - attacker.defense + random.randint(-2, 3))
            
            if "damage_bonus" in defender.ability:
                damage += defender.ability["damage_bonus"]
                battle_log.append(f"{defender.name} uses {defender.ability['name']}!")
            
            if "crit_chance" in defender.ability and random.random() < defender.ability["crit_chance"]:
                damage *= 2
                battle_log.append(f"💥 CRITICAL HIT!")
            
            attacker_health -= damage
            battle_log.append(f"{defender.name} deals {damage} damage to {attacker.name}")
            battle_log.append(f"{attacker.name} health: {max(0, attacker_health)}/{attacker.max_health}")
            
            if attacker_health <= 0:
                break
            
            damage = max(1, attacker.attack - defender.defense + random.randint(-2, 3))
            
            if "damage_bonus" in attacker.ability:
                damage += attacker.ability["damage_bonus"]
                battle_log.append(f"{attacker.name} uses {attacker.ability['name']}!")
            
            if "crit_chance" in attacker.ability and random.random() < attacker.ability["crit_chance"]:
                damage *= 2
                battle_log.append(f"💥 CRITICAL HIT!")
            
            defender_health -= damage
            battle_log.append(f"{attacker.name} deals {damage} damage to {defender.name}")
            battle_log.append(f"{defender.name} health: {max(0, defender_health)}/{defender.max_health}")
    
    # Determine winner
    if attacker_health > 0 and defender_health <= 0:
        winner = "attacker"
        battle_log.append(f"\n🎉 {attacker.name} WINS!")
    elif defender_health > 0 and attacker_health <= 0:
        winner = "defender"
        battle_log.append(f"\n💀 {defender.name} WINS!")
    else:
        # Draw or max rounds reached
        winner = "draw"
        if attacker_health > defender_health:
            winner = "attacker"
            battle_log.append(f"\n⏰ Time's up! {attacker.name} wins by health!")
        elif defender_health > attacker_health:
            winner = "defender"
            battle_log.append(f"\n⏰ Time's up! {defender.name} wins by health!")
        else:
            battle_log.append(f"\n🤝 It's a DRAW!")
    
    return {
        "winner": "user" if winner == "attacker" else "opponent" if winner == "defender" else "draw",
        "log": "\n".join(battle_log),
        "rounds": rounds
    }

def get_shop_items():
    """Get available shop items"""
    return [
        {
            "name": "Power Boost",
            "cost": 50,
            "description": "Increase attack by 3",
            "effect": "attack +3",
            "type": "attack"
        },
        {
            "name": "Defense Shield",
            "cost": 40,
            "description": "Increase defense by 3",
            "effect": "defense +3",
            "type": "defense"
        },
        {
            "name": "Health Potion",
            "cost": 30,
            "description": "Restore 20 health",
            "effect": "health +20",
            "type": "health"
        },
        {
            "name": "Speed Boots",
            "cost": 60,
            "description": "Increase speed by 2",
            "effect": "speed +2",
            "type": "speed"
        },
        {
            "name": "Mystery Box",
            "cost": 100,
            "description": "Random stat boost",
            "effect": "random +5",
            "type": "mystery"
        },
        {
            "name": "XP Boost",
            "cost": 80,
            "description": "Gain 50 XP instantly",
            "effect": "xp +50",
            "type": "xp"
        },
        {
            "name": "Coin Pouch",
            "cost": 20,
            "description": "Get 30 coins",
            "effect": "coins +30",
            "type": "coins"
        },
        {
            "name": "Ability Upgrade",
            "cost": 150,
            "description": "Upgrade your ability",
            "effect": "ability ++",
            "type": "ability"
        },
        {
            "name": "Max Health Boost",
            "cost": 70,
            "description": "Increase max health by 15",
            "effect": "max_health +15",
            "type": "max_health"
        },
        {
            "name": "Lucky Charm",
            "cost": 90,
            "description": "Increase critical hit chance",
            "effect": "crit +10%",
            "type": "crit"
        }
    ]

def purchase_item(user_data, item):
    """Purchase an item from the shop"""
    if user_data["coins"] < item["cost"]:
        return {"success": False, "message": "Not enough coins!"}
    
    box = user_data.get("box")
    if not box:
        return {"success": False, "message": "Create a box first!"}
    
    user_data["coins"] -= item["cost"]
    
    # Apply item effect
    if item["type"] == "attack":
        box.attack += 3
        message = f"Attack increased to {box.attack}!"
    elif item["type"] == "defense":
        box.defense += 3
        message = f"Defense increased to {box.defense}!"
    elif item["type"] == "health":
        box.health = min(box.max_health, box.health + 20)
        message = f"Health restored to {box.health}!"
    elif item["type"] == "speed":
        box.speed += 2
        message = f"Speed increased to {box.speed}!"
    elif item["type"] == "mystery":
        stat = random.choice(["attack", "defense", "speed"])
        if stat == "attack":
            box.attack += 5
            message = f"Mystery box gave +5 attack!"
        elif stat == "defense":
            box.defense += 5
            message = f"Mystery box gave +5 defense!"
        else:
            box.speed += 5
            message = f"Mystery box gave +5 speed!"
    elif item["type"] == "xp":
        box.gain_xp(50)
        message = f"Gained 50 XP! Current level: {box.level}"
    elif item["type"] == "coins":
        user_data["coins"] += 30
        message = f"Received 30 coins! Total: {user_data['coins']}"
    elif item["type"] == "ability":
        box.ability["level"] = box.ability.get("level", 1) + 1
        message = f"Ability upgraded to level {box.ability['level']}!"
    elif item["type"] == "max_health":
        box.max_health += 15
        box.health += 15
        message = f"Max health increased to {box.max_health}!"
    elif item["type"] == "crit":
        if "crit_chance" not in box.ability:
            box.ability["crit_chance"] = 0.1
        else:
            box.ability["crit_chance"] = min(0.5, box.ability["crit_chance"] + 0.1)
        message = f"Critical hit chance increased to {box.ability['crit_chance']*100:.0f}%!"
    
    user_data["inventory"].append(item["name"])
    
    return {"success": True, "message": message}

def get_leaderboard(game_state):
    """Get the global leaderboard"""
    players = []
    
    for user_id, data in game_state.items():
        if data.get("box"):
            players.append({
                "name": user_id,
                "box_name": data["box"].name,
                "level": data["box"].level,
                "wins": data.get("wins", 0),
                "losses": data.get("losses", 0),
                "total_battles": data.get("wins", 0) + data.get("losses", 0)
            })
    
    # Sort by wins, then by win rate
    players.sort(key=lambda x: (x["wins"], x["wins"]/(x["losses"]+1) if x["losses"] > 0 else x["wins"]), reverse=True)
    
    return players

def save_game_state(game_state, filename="game_state.json"):
    """Save game state to file"""
    try:
        with open(filename, 'w') as f:
            json.dump(game_state, f, default=str)
        return True
    except:
        return False

def load_game_state(filename="game_state.json"):
    """Load game state from file"""
    try:
        with open(filename, 'r') as f:
            return json.load(f)
    except:
        return {}