from __future__ import annotations

import datetime
from typing import ClassVar, List, Optional

from pydantic import Field, model_validator

from common import ApiModel
from ingredients import Ingredient
from api.dtos import MemberRef
from recipes import Recipe


class MealRecipe(ApiModel):
    meal_id: int
    recipe_id: int
    servings: float

    recipe: Optional[Recipe] = None


class Meal(ApiModel):
    KEYS: ClassVar[List[str]] = ["id", "suggested_date", "consumed_date", "purchase_date"]
    id: int = -1
    suggested_date: datetime.datetime
    consumed_date: Optional[datetime.datetime] = None

    chefs: List[MemberRef] = Field(default_factory=list)
    cleanup: List[MemberRef] = Field(default_factory=list)
    consumers: List[MemberRef] = Field(default_factory=list)
    recipes: List[MealRecipe] = Field(default_factory=list)
    extra_ingredients: List[Ingredient] = Field(default_factory=list)

    # Set from shopping list
    purchase_date: Optional[datetime.datetime] = None

    @model_validator(mode="before")
    @classmethod
    def _coerce_members(cls, data: dict) -> dict:
        # Accept legacy Person objects in tests by coercing to MemberRef
        def to_member_ref(x):
            # Already a mapping suitable for MemberRef or an instance with id/display_name
            if isinstance(x, dict):
                if "id" in x and ("display_name" in x or "displayName" in x or "name" in x):
                    # normalize display_name key
                    if "display_name" not in x:
                        dn = x.get("displayName") or x.get("name")
                        x = {**x, "display_name": dn}
                    return x
                return x
            # Object with attributes
            pid = getattr(x, "id", None)
            dname = getattr(x, "display_name", None) or getattr(x, "name", None)
            if isinstance(pid, int) and dname:
                return {"id": pid, "display_name": dname}
            return x

        if isinstance(data, dict):
            for key in ("chefs", "cleanup", "consumers"):
                val = data.get(key)
                if isinstance(val, list):
                    data[key] = [to_member_ref(v) for v in val]
        return data