from typing import List, ClassVar
from pydantic import BaseModel
from person import Person

import datetime

class Meal(BaseModel):
    KEYS: ClassVar[List[str]] = ['id', 'date']
    id: int
    date: datetime.datetime
    chef: List[Person] = []
    cleanup: List[Person] = []
    consumers: List[Person] = []
    recipes: List[Person] = []

async def create(conn):
    await conn.execute('''
        CREATE TABLE IF NOT EXISTS Meal (
            id INTEGER PRIMARY KEY,
            date TEXT UNIQUE
        );''')
    
    await conn.execute('''
        CREATE TABLE IF NOT EXISTS MealParticipant (
            meal_id INTEGER,
            person_id INTEGER,
            role TEXT,
            FOREIGN KEY(meal_id) REFERENCES Meal(id),
            FOREIGN KEY(person_id) REFERENCES Person(id)
        );''')
    
    await conn.execute('''
        CREATE TABLE IF NOT EXISTS MealRecipe (
            meal_id INTEGER,
            recipe_id INTEGER,
            FOREIGN KEY(meal_id) REFERENCES Meal(id),
            FOREIGN KEY(recipe_id) REFERENCES Recipe(id)
        );''')
    
async def insert_meal(conn, meal: Meal):
    async with conn.execute('''
        INSERT INTO Meal (date)
        VALUES (?)
    ''', (meal.date,)) as cursor:
        return cursor.lastrowid

async def find_meal_by_id(conn, meal_id: int) -> Meal:
    async with conn.execute(f'''
        SELECT {','.join(Meal.KEYS)} FROM Meal
        WHERE id = ?
        LIMIT 1
    ''', (meal_id,)) as cursor:
        async for row in cursor:
            return Meal(**{k:v for k,v in zip(Meal.KEYS, row)})

async def find_meal_by_date(conn, date: datetime) -> Meal:
    async with conn.execute(f'''
        SELECT {','.join(Meal.KEYS)} FROM Meal
        WHERE date = ?
        LIMIT 1
    ''', (date,)) as cursor:
        async for row in cursor:
            return Meal(**{k:v for k,v in zip(Meal.KEYS, row)})