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from pydantic import BaseModel, ConfigDict
from datetime import datetime, date
from typing import Optional, List, Dict


# Ingredient Schemas
class IngredientCreate(BaseModel):
    name: str
    quantity: float
    unit: str
    category: Optional[str] = None
    expiry_date: Optional[date] = None


class IngredientRead(BaseModel):
    id: int
    name: str
    quantity: float
    unit: str
    category: Optional[str]
    expiry_date: Optional[date]
    added_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class IngredientUpdate(BaseModel):
    name: Optional[str] = None
    quantity: Optional[float] = None
    unit: Optional[str] = None
    category: Optional[str] = None
    expiry_date: Optional[date] = None


# MealIngredient Schemas
class MealIngredientCreate(BaseModel):
    ingredient_name: str
    quantity_used: Optional[float] = None
    unit: Optional[str] = None


class MealIngredientRead(BaseModel):
    id: int
    meal_log_id: int
    ingredient_name: str
    quantity_used: Optional[float]
    unit: Optional[str]

    model_config = ConfigDict(from_attributes=True)


class MealIngredientUpdate(BaseModel):
    ingredient_name: Optional[str] = None
    quantity_used: Optional[float] = None
    unit: Optional[str] = None


# MealLog Schemas
class MealLogCreate(BaseModel):
    meal_name: str
    meal_type: str
    eaten_at: Optional[datetime] = None
    notes: Optional[str] = None
    servings: int = 1
    ingredients: Optional[List[MealIngredientCreate]] = None


class MealLogRead(BaseModel):
    id: int
    meal_name: str
    meal_type: str
    eaten_at: datetime
    notes: Optional[str]
    servings: int
    ingredients: List[MealIngredientRead]

    model_config = ConfigDict(from_attributes=True)


class MealLogUpdate(BaseModel):
    meal_name: Optional[str] = None
    meal_type: Optional[str] = None
    eaten_at: Optional[datetime] = None
    notes: Optional[str] = None
    servings: Optional[int] = None


# Recipe Schemas
class RecipeCreate(BaseModel):
    name: str
    meal_type: str
    ingredients: str
    instructions: Optional[str] = None
    estimated_time_minutes: Optional[int] = None
    servings: int = 2
    source: str = "ai"


class RecipeRead(BaseModel):
    id: int
    name: str
    meal_type: str
    ingredients: str
    instructions: Optional[str]
    estimated_time_minutes: Optional[int]
    servings: int
    source: str
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class RecipeUpdate(BaseModel):
    name: Optional[str] = None
    meal_type: Optional[str] = None
    ingredients: Optional[str] = None
    instructions: Optional[str] = None
    estimated_time_minutes: Optional[int] = None
    servings: Optional[int] = None
    source: Optional[str] = None


# MenuPlan Schemas
class MenuPlanCreate(BaseModel):
    week_start: date
    plan: str
    model_used: Optional[str] = None


class MenuPlanRead(BaseModel):
    id: int
    week_start: date
    plan: str
    generated_at: datetime
    model_used: Optional[str]

    model_config = ConfigDict(from_attributes=True)


class MenuPlanUpdate(BaseModel):
    week_start: Optional[date] = None
    plan: Optional[str] = None
    model_used: Optional[str] = None


# GroceryList Schemas
class GroceryListCreate(BaseModel):
    generated_for: date
    items: str
    total_estimate: Optional[float] = None
    notes: Optional[str] = None


class GroceryListRead(BaseModel):
    id: int
    generated_for: date
    items: str
    total_estimate: Optional[float]
    generated_at: datetime
    is_purchased: bool
    notes: Optional[str]

    model_config = ConfigDict(from_attributes=True)


class GroceryListUpdate(BaseModel):
    generated_for: Optional[date] = None
    items: Optional[str] = None
    total_estimate: Optional[float] = None
    is_purchased: Optional[bool] = None
    notes: Optional[str] = None


# Complex domain schemas
class GroceryItem(BaseModel):
    name: str
    quantity: float
    unit: str
    store_section: Optional[str] = None
    estimated_cost: Optional[float] = None
    used_in_meals: List[str] = []
    reason: Optional[str] = None


class PantryContext(BaseModel):
    available_ingredients: List[IngredientRead] = []
    expiring_soon: List[IngredientRead] = []
    recent_meals: List[MealLogRead] = []
    meal_frequency: Dict[str, int] = {}


class WeeklyMenuSlot(BaseModel):
    name: str
    ingredients: List[str] = []
    instructions: Optional[str] = None
    time_minutes: Optional[int] = None


class WeeklyMenuDay(BaseModel):
    breakfast: Optional[WeeklyMenuSlot] = None
    lunch: Optional[WeeklyMenuSlot] = None
    dinner: Optional[WeeklyMenuSlot] = None