"""
SQLModel database models for Silver Table Assistant.
Defines the data structure for profiles, orders, donations, and menu items.
"""

from datetime import datetime
from typing import Optional, Dict, Any, List
from uuid import UUID, uuid4

from sqlmodel import SQLModel, Field, Column, JSON
from sqlalchemy import Column as SQLColumn, DateTime
from sqlalchemy.dialects.postgresql import UUID as PostgresUUID
from sqlalchemy.sql import func
from enum import Enum


class OrderStatus(str, Enum):
    """Order status enumeration."""
    PENDING = "pending"
    PAID = "paid"
    COMPLETED = "completed"
    CANCELLED = "cancelled"


class DonationStatus(str, Enum):
    """Donation status enumeration."""
    PENDING = "pending"
    COMPLETED = "completed"
    FAILED = "failed"
    CANCELLED = "cancelled"


class Profile(SQLModel, table=True):
    """Senior profile model for storing health and dietary information."""
    
    id: UUID = Field(
        default_factory=uuid4,
        sa_column=SQLColumn(PostgresUUID(as_uuid=True), primary_key=True)
    )
    user_id: UUID = Field(
        description="Reference to the owner user",
        index=True
    )
    name: str = Field(
        max_length=255,
        description="Senior's name"
    )
    age: int = Field(
        description="Senior's age",
        ge=0,
        le=150
    )
    gender: str = Field(
        max_length=20,
        description="Senior's gender (male/female)"
    )
    height: float = Field(
        description="Senior's height in cm"
    )
    weight: float = Field(
        description="Senior's weight in kg"
    )
    # Using JSON for lists to maintain simplicity across DBs
    chronic_diseases: List[str] = Field(
        default_factory=list,
        sa_column=SQLColumn(JSON)
    )
    dietary_restrictions: List[str] = Field(
        default_factory=list,
        sa_column=SQLColumn(JSON)
    )
    chewing_ability: str = Field(
        default="normal",
        max_length=50,
        description="normal, soft, or pureed"
    )
    avatar_url: Optional[str] = Field(
        default=None,
        max_length=500
    )
    created_at: datetime = Field(
        default_factory=func.now,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now())
    )
    updated_at: datetime = Field(
        default_factory=datetime.utcnow,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )


class Order(SQLModel, table=True):
    """Order model for storing food orders and payment information."""
    
    id: Optional[UUID] = Field(
        default_factory=uuid4,
        sa_column=SQLColumn(PostgresUUID(as_uuid=True), primary_key=True)
    )
    profile_id: UUID = Field(
        foreign_key="profile.id",
        description="Reference to the profile that made this order",
        index=True
    )
    items: Dict[str, Any] = Field(
        sa_column=Column(JSON),
        description="JSON object containing order items with quantities and details"
    )
    total_amount: int = Field(
        description="Total order amount in cents",
        ge=0
    )
    status: str = Field(
        default=OrderStatus.PENDING.value,
        description="Order status: pending, paid, completed, cancelled",
        max_length=50
    )
    stripe_session_id: Optional[str] = Field(
        default=None,
        description="Stripe checkout session ID for payment tracking",
        max_length=1000
    )
    created_at: datetime = Field(
        default_factory=func.now,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now())
    )
    updated_at: datetime = Field(
        default_factory=datetime.utcnow,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )


class Donation(SQLModel, table=True):
    """Donation model for storing donation information and payment details."""
    
    id: Optional[UUID] = Field(
        default_factory=uuid4,
        sa_column=SQLColumn(PostgresUUID(as_uuid=True), primary_key=True)
    )
    user_id: Optional[UUID] = Field(
        default=None,
        description="Optional reference to authenticated user",
        index=True
    )
    donor_name: Optional[str] = Field(
        default=None,
        description="Donor's name (optional for anonymous donations)",
        max_length=255
    )
    amount: int = Field(
        description="Donation amount in cents",
        ge=1
    )
    status: str = Field(
        default=DonationStatus.PENDING.value,
        description="Donation status: pending, completed, failed, cancelled",
        max_length=50
    )
    stripe_session_id: Optional[str] = Field(
        default=None,
        description="Stripe checkout session ID for payment tracking",
        max_length=1000
    )
    created_at: datetime = Field(
        default_factory=func.now,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now())
    )
    updated_at: datetime = Field(
        default_factory=datetime.utcnow,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )


class MenuItem(SQLModel, table=True):
    """Menu item model for storing available food items and their nutritional information."""
    
    id: Optional[int] = Field(
        default=None,
        primary_key=True,
        description="Menu item ID"
    )
    name: str = Field(
        max_length=255,
        description="Name of the menu item"
    )
    description: Optional[str] = Field(
        default=None,
        description="Detailed description of the menu item",
        max_length=1000
    )
    suitable_for: List[str] = Field(
        default_factory=list,
        sa_column=Column(JSON),
        description="List of suitable health conditions (e.g., ['高血壓', '牙口不好'])"
    )
    image_url: Optional[str] = Field(
        default=None,
        description="URL to the menu item image",
        max_length=500
    )
    nutrition: Dict[str, Any] = Field(
        sa_column=Column(JSON),
        description="JSON object containing nutritional information (calories, protein, carbs, etc.)"
    )
    price: int = Field(
        description="Price of the menu item in cents",
        ge=0
    )
    category: Optional[str] = Field(
        default=None,
        description="Food category (e.g., 蛋白質類, 葷食類)",
        max_length=100
    )
    available: bool = Field(
        default=True,
        description="Whether this menu item is currently available"
    )
    created_at: datetime = Field(
        default_factory=func.now,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now())
    )


# Chat conversation model for storing AI chat history
class ChatConversation(SQLModel, table=True):
    """Chat conversation model for storing AI chat history with users."""
    
    id: Optional[int] = Field(
        default=None,
        primary_key=True,
        description="Chat conversation ID"
    )
    profile_id: Optional[UUID] = Field(
        default=None,
        foreign_key="profile.id",
        description="Reference to the profile",
        index=True
    )
    message: str = Field(
        description="User's message",
        max_length=5000
    )
    response: Optional[str] = Field(
        default=None,
        description="AI assistant's response",
        max_length=5000
    )
    meta_data: Optional[Dict[str, Any]] = Field(
        default={},
        sa_column=Column(JSON),
        description="Additional metadata (e.g., context, recommendations)"
    )
    created_at: datetime = Field(
        default_factory=func.now,
        sa_column=SQLColumn(DateTime(timezone=True), server_default=func.now())
    )