from __future__ import annotations

from typing import Dict, List, Optional

import aiosqlite
from fastapi import APIRouter, Depends, Query, Response

import ingredients as ingredients_mod
import recipes
from api.deps import error_response, get_db, get_household_from_slug, get_current_user
from common import Page, ProblemDetails, ApiModel, Field
from api.dtos import MemberRef

router = APIRouter(prefix="/households/{householdSlug}/recipes", tags=["recipes"])
# Public, stateless recipes utilities
public = APIRouter(prefix="/recipes", tags=["recipes"])


class RecipeOut(ApiModel):
    id: int = -1
    name: str
    link: str
    serves: int
    image_urls: List[str] = Field(min_length=0, json_schema_extra={"minItems": 0})
    ingredients: List[ingredients_mod.Ingredient] = Field(
        min_length=0, json_schema_extra={"minItems": 0}
    )
    created_by_id: int
    created_by: Optional[MemberRef] = None
    hidden_by_id: Optional[int] = None
    hidden_by: Optional[MemberRef] = None


class RecipeCreate(ApiModel):
    name: str
    link: str
    serves: int
    image_urls: List[str] = Field(min_length=0, json_schema_extra={"minItems": 0})
    ingredients: List[ingredients_mod.Ingredient] = Field(
        min_length=0, json_schema_extra={"minItems": 0}
    )


class ParseUrlIn(ApiModel):
    url: str


@router.get("", response_model=Page[RecipeOut])
async def list_recipes(
    household=Depends(get_household_from_slug),
    q: Optional[str] = Query(default=None),
    cursor: Optional[str] = Query(default=None),
    limit: int = Query(50, ge=1, le=200),
    conn: aiosqlite.Connection = Depends(get_db),
):
    last_id = None
    if cursor:
        try:
            last_id = int(cursor)
        except ValueError:
            last_id = None
    fetch_limit = limit + 1
    hid = household["id"]
    paged: List[recipes.Recipe] = []
    if q:
        async for r in recipes.find_recipes_by_name_paged_scoped(
            conn, q, last_id, fetch_limit, hid
        ):
            paged.append(r)
    else:
        async for r in recipes.get_all_paged_scoped(conn, last_id, fetch_limit, hid):
            paged.append(r)
    # Filter by household_id once repositories are fully updated; currently placeholder until repo changes land.
    has_more = len(paged) > limit
    items = paged[:limit]
    if items:
        recipe_ids = [r.id for r in items]
        by_recipe = await ingredients_mod.find_ingredients_by_recipe_ids(conn, recipe_ids)
        for r in items:
            r.ingredients = by_recipe.get(r.id, [])
    # Lookup creators' display names
    creator_ids = {r.created_by_id for r in items if getattr(r, "created_by_id", None) is not None}
    creator_lookup: Dict[int, str] = {}
    if creator_ids:
        from users.repository import get_by_ids as get_users_by_ids

        users = await get_users_by_ids(conn, list(creator_ids))
        creator_lookup = {uid: u.display_name for uid, u in users.items()}

    def to_recipe_out(r: recipes.Recipe) -> RecipeOut:
        mref = None
        name = creator_lookup.get(r.created_by_id)
        if name is not None:
            mref = MemberRef(id=r.created_by_id, display_name=name)
        return RecipeOut(
            id=r.id,
            name=r.name,
            link=r.link,
            serves=r.serves,
            image_urls=r.image_urls,
            ingredients=r.ingredients,
            created_by_id=r.created_by_id,
            created_by=mref,
        )

    next_cursor = str(items[-1].id) if has_more and items else None
    total = await (
        recipes.count_by_name_scoped(conn, q, hid) if q else recipes.count_all_scoped(conn, hid)
    )
    outward_items = [to_recipe_out(r) for r in items]
    return Page(items=outward_items, nextCursor=next_cursor, prevCursor=None, total=total)


@router.get("/{recipe_id}", response_model=RecipeOut, responses={404: {"model": ProblemDetails}})
async def get_recipe(
    recipe_id: int,
    household=Depends(get_household_from_slug),
    conn: aiosqlite.Connection = Depends(get_db),
):
    r = await recipes.find_recipe_by_id_scoped(conn, recipe_id, household["id"])
    if not r:
        return error_response(None, 404, "Recipe not found")
    # Ensure ingredients are loaded for single-recipe fetch
    await recipes.load_recipe_ingredients(conn, r)
    # load creator display name
    mref = None
    from users.repository import get_by_id as get_user_by_id

    u = await get_user_by_id(conn, r.created_by_id)
    if u:
        mref = MemberRef(id=r.created_by_id, display_name=u.display_name)
    return RecipeOut(
        id=r.id,
        name=r.name,
        link=r.link,
        serves=r.serves,
        image_urls=r.image_urls,
        ingredients=r.ingredients,
        created_by_id=r.created_by_id,
        created_by=mref,
    )


@router.delete("/{recipe_id}", response_model=RecipeOut, responses={404: {"model": ProblemDetails}})
async def delete_recipe(
    recipe_id: int,
    household=Depends(get_household_from_slug),
    user=Depends(get_current_user),
    conn: aiosqlite.Connection = Depends(get_db),
):
    # Load recipe in-scope
    r = await recipes.find_recipe_by_id_scoped(conn, recipe_id, household["id"])
    if not r:
        return error_response(None, 404, "Recipe not found")
    # Hide within household via repository and set hidden_by_id using a single UPDATE
    from recipes.repository import hide_recipe_scoped_with_actor

    ok = await hide_recipe_scoped_with_actor(conn, recipe_id, household["id"], user.id)
    if not ok:
        return error_response(None, 404, "Recipe not found")
    # Best-effort creator lookup
    mref = None
    from users.repository import get_by_id as get_user_by_id

    u = await get_user_by_id(conn, r.created_by_id)
    if u:
        mref = MemberRef(id=r.created_by_id, display_name=u.display_name)
    # hiddenBy is the current user
    hidden = MemberRef(id=user.id, display_name=user.display_name)
    return RecipeOut(
        id=r.id,
        name=r.name,
        link=r.link,
        serves=r.serves,
        image_urls=r.image_urls,
        ingredients=r.ingredients,
        created_by_id=r.created_by_id,
        created_by=mref,
        hidden_by_id=user.id,
        hidden_by=hidden,
    )


@router.post("", response_model=RecipeOut, responses={400: {"model": ProblemDetails}})
async def create_recipe(
    recipe: RecipeCreate,
    response: Response,
    household=Depends(get_household_from_slug),
    user=Depends(get_current_user),
    conn: aiosqlite.Connection = Depends(get_db),
):
    if not recipe.ingredients:
        return error_response(None, 400, "Recipe must have at least one ingredient")
    # Disallow empty ingredients with neither product nor textual content
    for ing in recipe.ingredients:
        name = (ing.name or "").strip()
        line = (ing.line or "").strip()
        has_product = getattr(ing, "product", None) is not None or (
            getattr(ing, "product_id", None) is not None and getattr(ing, "product_id") >= 0
        )
        if not has_product and name == "" and line == "":
            return error_response(None, 400, "Ingredient must include a name or line or a product")
        # quantity must be > 0
        try:
            q = float(getattr(ing, "quantity", 0))
        except Exception:
            q = getattr(ing, "quantity", 0)
        if isinstance(q, (int, float)) and q <= 0:
            return error_response(None, 400, "Ingredient quantity must be greater than 0")
    hid = household["id"]
    # Build domain model and insert
    r = recipes.Recipe(
        id=-1,
        name=recipe.name,
        link=recipe.link,
        serves=recipe.serves,
        image_urls=recipe.image_urls,
        ingredients=list(recipe.ingredients),
        created_by_id=user.id,
    )
    await recipes.insert_recipe_scoped(conn, r, hid)
    for ingredient in recipe.ingredients:
        ingredient.recipe_id = r.id
        if ingredient.product:
            ingredient.product_id = ingredient.product.id
        try:
            await ingredients_mod.insert_ingredient(conn, ingredient)
        except ValueError as e:
            return error_response(None, 400, str(e))
    response.headers["Location"] = f"/api/v1/households/{household['slug']}/recipes/{r.id}"
    created = MemberRef(id=user.id, display_name=user.display_name)
    out = RecipeOut(
        id=r.id,
        name=r.name,
        link=r.link,
        serves=r.serves,
        image_urls=r.image_urls,
        ingredients=r.ingredients,
        created_by_id=r.created_by_id,
        created_by=created,
    )
    return out.model_dump(by_alias=False)


@router.post("/parse-from-url", response_model=RecipeCreate)
async def parse_from_url(
    body: ParseUrlIn,
    household=Depends(get_household_from_slug),
    user=Depends(get_current_user),
    conn: aiosqlite.Connection = Depends(get_db),
):
    # Build an unsaved Recipe object using NLP parsing and product matching; do not insert
    r = await recipes.parse_recipe(conn, user, body.url)
    if not r:
        # Parsing failed: treat as unprocessable rather than not-found
        return error_response(None, 422, "Unable to parse recipe from URL")
    # Return the same shape a client would POST to create
    return RecipeCreate(
        name=r.name,
        link=r.link,
        serves=r.serves,
        image_urls=r.image_urls,
        ingredients=r.ingredients,
    )


"""
Note: public parse endpoint moved to /api/v1/ingredients/parse (see api/ingredients.py)
"""