"""
Authentication router.
Handles user registration, login, and profile retrieval.
"""
from fastapi import APIRouter, HTTPException, Depends, status, Request
from typing import Dict, Any

from ..services.helpers import get_game_message

from ..core.security import create_access_token, hash_password, verify_password, get_current_user
from ..services.models import UserRegister, UserLogin
from .. import database as db
from ..items import items_manager
from ..services.helpers import calculate_player_capacity, enrich_character_data

router = APIRouter(prefix="/api/auth", tags=["authentication"])


@router.post("/register")
async def register(user: UserRegister):
    """Register a new account"""
    # Check if email already exists
    existing = await db.get_account_by_email(user.email)
    if existing:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Email already registered"
        )
    
    # Hash password
    password_hash = hash_password(user.password)
    
    # Create account
    account = await db.create_account(
        email=user.email,
        password_hash=password_hash,
        account_type="web"
    )
    
    if not account:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Failed to create account"
        )
    
    # Get characters for this account (should be empty for new account)
    characters = await db.get_characters_by_account_id(account["id"])
    
    # Create access token with account_id (no character selected yet)
    access_token = create_access_token({
        "account_id": account["id"],
        "character_id": None
    })
    
    return {
        "access_token": access_token,
        "token_type": "bearer",
        "account": {
            "id": account["id"],
            "email": account["email"],
            "account_type": account["account_type"],
            "is_premium": account.get("premium_expires_at") is not None,
        },
        "characters": characters,
        "needs_character_creation": len(characters) == 0
    }


@router.post("/login")
async def login(user: UserLogin):
    """Login with email and password"""
    # Get account by email
    account = await db.get_account_by_email(user.email)
    if not account:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid email or password"
        )
    
    # Verify password
    if not account.get('password_hash'):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid email or password"
        )
    
    if not verify_password(user.password, account['password_hash']):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid email or password"
        )
    
    # Update last login
    await db.update_account_last_login(account["id"])
    
    # Get characters for this account
    characters = await db.get_characters_by_account_id(account["id"])
    
    # Create access token with account_id (no character selected yet)
    access_token = create_access_token({
        "account_id": account["id"],
        "character_id": None
    })
    
    return {
        "access_token": access_token,
        "token_type": "bearer",
        "account": {
            "id": account["id"],
            "email": account["email"],
            "account_type": account["account_type"],
            "is_premium": account.get("premium_expires_at") is not None,
        },
        "characters": [
            await enrich_character_data(char, items_manager)
            for char in characters
        ],
        "needs_character_creation": len(characters) == 0
    }


@router.get("/me")
async def get_me(current_user: Dict[str, Any] = Depends(get_current_user)):
    """Get current user profile"""
    return {
        "id": current_user["id"],
        "username": current_user.get("username"),
        "name": current_user["name"],
        "level": current_user["level"],
        "xp": current_user["xp"],
        "hp": current_user["hp"],
        "max_hp": current_user["max_hp"],
        "stamina": current_user["stamina"],
        "max_stamina": current_user["max_stamina"],
        "strength": current_user["strength"],
        "agility": current_user["agility"],
        "endurance": current_user["endurance"],
        "intellect": current_user["intellect"],
        "location_id": current_user["location_id"],
        "is_dead": current_user["is_dead"],
        "unspent_points": current_user["unspent_points"]
    }


@router.get("/account")
async def get_account(current_user: Dict[str, Any] = Depends(get_current_user)):
    """Get current account details including characters"""
    # Get account from current user's account_id
    account_id = current_user.get("account_id")
    if not account_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="No account associated with this user"
        )
    
    account = await db.get_account_by_id(account_id)
    if not account:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Account not found"
        )
    
    # Get characters for this account
    characters = await db.get_characters_by_account_id(account_id)
    
    return {
        "account": {
            "id": account["id"],
            "email": account["email"],
            "account_type": account["account_type"],
            "is_premium": account.get("premium_expires_at") is not None and account.get("premium_expires_at") > 0,
            "premium_expires_at": account.get("premium_expires_at"),
            "created_at": account.get("created_at"),
            "last_login_at": account.get("last_login_at"),
        },
        "characters": [
            await enrich_character_data(char, items_manager)
            for char in characters
        ]
    }


@router.post("/change-email")
async def change_email(
    request: "ChangeEmailRequest",
    req: Request,
    current_user: Dict[str, Any] = Depends(get_current_user)
):
    """Change account email address"""
    from ..services.models import ChangeEmailRequest
    locale = req.headers.get('Accept-Language', 'en')
    
    # Get account
    account_id = current_user.get("account_id")
    if not account_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="No account associated with this user"
        )
    
    account = await db.get_account_by_id(account_id)
    if not account:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Account not found"
        )
    
    # Verify current password
    if not account.get('password_hash'):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="This account does not have a password set"
        )
    
    if not verify_password(request.current_password, account['password_hash']):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Current password is incorrect"
        )
    
    # Validate new email format
    import re
    email_regex = r'^[^\s@]+@[^\s@]+\.[^\s@]+$'
    if not re.match(email_regex, request.new_email):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid email format"
        )
    
    # Update email
    try:
        await db.update_account_email(account_id, request.new_email)
        return {"message": get_game_message('email_updated', locale), "new_email": request.new_email}
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e)
        )


@router.post("/change-password")
async def change_password(
    request: "ChangePasswordRequest",
    req: Request,
    current_user: Dict[str, Any] = Depends(get_current_user)
):
    """Change account password"""
    from ..services.models import ChangePasswordRequest
    locale = req.headers.get('Accept-Language', 'en')
    
    # Get account
    account_id = current_user.get("account_id")
    if not account_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="No account associated with this user"
        )
    
    account = await db.get_account_by_id(account_id)
    if not account:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Account not found"
        )
    
    # Verify current password
    if not account.get('password_hash'):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="This account does not have a password set"
        )
    
    if not verify_password(request.current_password, account['password_hash']):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Current password is incorrect"
        )
    
    # Validate new password
    if len(request.new_password) < 6:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="New password must be at least 6 characters"
        )
    
    # Hash and update password
    new_password_hash = hash_password(request.new_password)
    await db.update_account_password(account_id, new_password_hash)
    
    return {"message": get_game_message('password_updated', locale)}


@router.post("/steam-login")
async def steam_login(steam_data: Dict[str, Any]):
    """
    Login or register with Steam account.
    Creates account if it doesn't exist.
    """
    steam_id = steam_data.get("steam_id")
    steam_name = steam_data.get("steam_name", "Steam User")
    
    if not steam_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Steam ID is required"
        )
    
    # Try to find existing account by steam_id
    account = await db.get_account_by_steam_id(steam_id)
    
    if not account:
        # Create new Steam account
        # Use steam_id as email (unique identifier)
        email = f"steam_{steam_id}@steamuser.local"
        
        account = await db.create_account(
            email=email,
            password_hash=None,  # Steam accounts don't have passwords
            account_type="steam",
            steam_id=steam_id
        )
        
        if not account:
            raise HTTPException(
                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                detail="Failed to create Steam account"
            )
    
    # Get characters for this account
    characters = await db.get_characters_by_account_id(account["id"])
    
    # Create access token with account_id (no character selected yet)
    access_token = create_access_token({
        "account_id": account["id"],
        "character_id": None
    })
    
    return {
        "access_token": access_token,
        "token_type": "bearer",
        "account": {
            "id": account["id"],
            "email": account["email"],
            "account_type": account["account_type"],
            "steam_id": steam_id,
            "steam_name": steam_name,
            "premium_expires_at": account.get("premium_expires_at"),
            "created_at": account.get("created_at"),
            "last_login_at": account.get("last_login_at")
        },
        "characters": [
            await enrich_character_data(char, items_manager)
            for char in characters
        ],
        "needs_character_creation": len(characters) == 0
    }