use api::{
    AddRecipeIngredientRequest, CreateRecipeRequest, CreateRecipeResponse, EmptyResponse,
    IngredientInfo, ListRecipesResponse, RecipeEditRating, RecipeEditStepsRequest, RecipeInfo,
    RecipeIngredientEditRequest, RecipeRenameRequest, RecipeEditPersonCount,
};
use axum::{
    async_trait,
    extract::{FromRef, FromRequestParts, Path, State},
    http::request::Parts,
    Json,
};
use sea_orm::{prelude::*, ActiveValue, TransactionTrait};

use crate::entity::{ingredient, prelude::*, recipe, recipe_ingredients};

use super::{
    household::AuthorizedHousehold, ingredients::IngredientExtractor, AppState, JsonResult,
    RouteError,
};

pub(super) async fn create_recipe(
    AuthorizedHousehold(household): AuthorizedHousehold,
    State(state): State<AppState>,
    Json(request): Json<CreateRecipeRequest>,
) -> JsonResult<CreateRecipeResponse> {
    let id = state
        .db
        .transaction(|txn| {
            Box::pin(async move {
                let model = recipe::ActiveModel {
                    name: ActiveValue::Set(request.name),
                    ranking: ActiveValue::Set(request.rating as i32),
                    household: ActiveValue::Set(household.id),
                    steps: ActiveValue::Set(request.steps),
                    person_count: ActiveValue::Set(request.person_count.max(1) as i32),
                    ..Default::default()
                };

                let recipe = model.insert(txn).await?;

                for (ig, amount) in request.ingredients {
                    if 0 == household
                        .find_related(Ingredient)
                        .filter(ingredient::Column::Id.eq(ig))
                        .count(txn)
                        .await?
                    {
                        Err(RouteError::InvalidRequest(format!(
                            "No such ingredient {ig}"
                        )))?;
                    }

                    let model = recipe_ingredients::ActiveModel {
                        recipe_id: ActiveValue::Set(recipe.id),
                        ingredient_id: ActiveValue::Set(ig),
                        amount: ActiveValue::Set(amount),
                    };

                    model.insert(txn).await?;
                }

                Ok(recipe.id)
            })
        })
        .await?;

    Ok(CreateRecipeResponse { id }.into())
}

pub(super) async fn list_recipes(
    AuthorizedHousehold(household): AuthorizedHousehold,
    State(state): State<AppState>,
) -> JsonResult<ListRecipesResponse> {
    Ok(ListRecipesResponse {
        recipes: household
            .find_related(Recipe)
            .all(&state.db)
            .await?
            .into_iter()
            .map(|r| (r.id, r.name, r.ranking as _))
            .collect(),
    }
    .into())
}

pub(super) struct RecipeExtractor(recipe::Model);

#[async_trait]
impl<S> FromRequestParts<S> for RecipeExtractor
where
    S: Send + Sync,
    AppState: FromRef<S>,
{
    type Rejection = RouteError;

    async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
        let State(app_state): State<AppState> = State::from_request_parts(parts, state)
            .await
            .expect("No state");

        #[derive(serde::Deserialize)]
        pub(super) struct RecipeId {
            recipe_id: i64,
        }

        let household = AuthorizedHousehold::from_request_parts(parts, state).await?;
        let Path(recipe): Path<RecipeId> = Path::from_request_parts(parts, state).await?;

        match household
            .0
            .find_related(Recipe)
            .filter(recipe::Column::Id.eq(recipe.recipe_id))
            .one(&app_state.db)
            .await?
        {
            None => Err(RouteError::RessourceNotFound),
            Some(r) => Ok(Self(r)),
        }
    }
}

pub(super) async fn fetch_recipe(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
) -> JsonResult<RecipeInfo> {
    let recipe_ingredients = recipe.find_related(Ingredient).all(&state.db).await?;

    let mut ingredients = Vec::new();

    for ingredient in recipe_ingredients {
        ingredients.push((
            ingredient.id,
            IngredientInfo {
                name: ingredient.name,
                unit: ingredient.unit,
            },
            RecipeIngredients::find_by_id((recipe.id, ingredient.id))
                .one(&state.db)
                .await?
                .expect("Ingredient should exist as it was fetched")
                .amount,
        ));
    }

    Ok(RecipeInfo {
        person_count: recipe.person_count as _,
        name: recipe.name,
        steps: recipe.steps,
        rating: recipe.ranking as _,
        ingredients,
    }
    .into())
}

pub(super) async fn edit_name(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    Json(req): Json<RecipeRenameRequest>,
) -> JsonResult<EmptyResponse> {
    let active_model = recipe::ActiveModel {
        name: ActiveValue::Set(req.name),
        id: ActiveValue::Set(recipe.id),
        ..Default::default()
    };

    active_model.update(&state.db).await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn edit_ig_amount(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    IngredientExtractor(ingredient): IngredientExtractor,
    Json(req): Json<RecipeIngredientEditRequest>,
) -> JsonResult<EmptyResponse> {
    let active_model = recipe_ingredients::ActiveModel {
        recipe_id: ActiveValue::Set(recipe.id),
        ingredient_id: ActiveValue::Set(ingredient.id),
        amount: ActiveValue::Set(req.amount),
    };

    active_model.update(&state.db).await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn delete_ig(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    IngredientExtractor(ingredient): IngredientExtractor,
) -> JsonResult<EmptyResponse> {
    RecipeIngredients::delete_by_id((recipe.id, ingredient.id))
        .exec(&state.db)
        .await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn add_ig_request(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    IngredientExtractor(ingredient): IngredientExtractor,
    Json(req): Json<AddRecipeIngredientRequest>,
) -> JsonResult<EmptyResponse> {
    let model = recipe_ingredients::ActiveModel {
        recipe_id: ActiveValue::Set(recipe.id),
        ingredient_id: ActiveValue::Set(ingredient.id),
        amount: ActiveValue::Set(req.amount),
    };

    model.insert(&state.db).await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn edit_step(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    Json(req): Json<RecipeEditStepsRequest>,
) -> JsonResult<EmptyResponse> {
    let model = recipe::ActiveModel {
        id: ActiveValue::Set(recipe.id),
        steps: ActiveValue::Set(req.steps),
        ..Default::default()
    };

    model.update(&state.db).await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn edit_rating(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    Json(req): Json<RecipeEditRating>,
) -> JsonResult<EmptyResponse> {
    let model = recipe::ActiveModel {
        id: ActiveValue::Set(recipe.id),
        ranking: ActiveValue::Set(req.rating as _),
        ..Default::default()
    };

    model.update(&state.db).await?;

    Ok(EmptyResponse {}.into())
}

pub(super) async fn edit_person_count(
    State(state): State<AppState>,
    RecipeExtractor(recipe): RecipeExtractor,
    Json(req): Json<RecipeEditPersonCount>,
) -> JsonResult<EmptyResponse> {
    let model = recipe::ActiveModel {
        id: ActiveValue::Set(recipe.id),
        person_count: ActiveValue::Set(req.person_count.max(1) as _),
        ..Default::default()
    };

    model.update(&state.db).await?;

    Ok(EmptyResponse {}.into())
}