use axum::{
    extract::{Path, Query},
    http::StatusCode,
    response::IntoResponse,
    routing::get,
    Json, Router,
};
use prisma_client_rust::Direction;

use crate::{
    meilisearch::{get_meili_client, BookMeili},
    prisma::{
        author,
        book::{self},
        book_annotation, book_author, book_genre, book_sequence, genre, translator,
    },
    serializers::{
        allowed_langs::AllowedLangs,
        book::{BaseBook, Book, BookFilter, DetailBook, RandomBookFilter, RemoteBook},
        book_annotation::BookAnnotation,
        pagination::{Page, Pagination},
    },
};

use super::{common::get_random_item::get_random_item, Database};

pub async fn get_books(
    db: Database,
    axum_extra::extract::Query(book_filter): axum_extra::extract::Query<BookFilter>,
    pagination: Query<Pagination>,
) -> impl IntoResponse {
    let filter = book_filter.get_filter_vec();

    let books_count = db.book().count(filter.clone()).exec().await.unwrap();

    let books = db
        .book()
        .find_many(filter)
        .with(book::book_annotation::fetch())
        .with(book::source::fetch())
        .with(
            book::book_authors::fetch(vec![])
                .with(book_author::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(
            book::translations::fetch(vec![])
                .with(translator::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(book::book_sequences::fetch(vec![]).with(book_sequence::sequence::fetch()))
        .order_by(book::id::order(Direction::Asc))
        .skip((pagination.page - 1) * pagination.size)
        .take(pagination.size)
        .exec()
        .await
        .unwrap();

    let page: Page<RemoteBook> = Page::new(
        books.iter().map(|item| item.clone().into()).collect(),
        books_count,
        &pagination,
    );

    Json(page)
}

pub async fn get_base_books(
    db: Database,
    axum_extra::extract::Query(book_filter): axum_extra::extract::Query<BookFilter>,
    pagination: Query<Pagination>,
) -> impl IntoResponse {
    let filter = book_filter.get_filter_vec();

    let books_count = db.book().count(filter.clone()).exec().await.unwrap();

    let books = db
        .book()
        .find_many(filter)
        .with(book::source::fetch())
        .order_by(book::id::order(Direction::Asc))
        .skip((pagination.page - 1) * pagination.size)
        .take(pagination.size)
        .exec()
        .await
        .unwrap();

    let page: Page<BaseBook> = Page::new(
        books.iter().map(|item| item.clone().into()).collect(),
        books_count,
        &pagination,
    );

    Json(page)
}

pub async fn get_random_book(
    db: Database,
    axum_extra::extract::Query(book_filter): axum_extra::extract::Query<RandomBookFilter>,
) -> impl IntoResponse {
    let book_id = {
        let client = get_meili_client();

        let authors_index = client.index("books");

        let filter = {
            let langs_filter = format!("lang IN [{}]", book_filter.allowed_langs.join(", "));
            let genre_filter = match book_filter.genre {
                Some(v) => format!(" AND genres = {v}"),
                None => "".to_string(),
            };

            format!("{langs_filter}{genre_filter}")
        };

        get_random_item::<BookMeili>(authors_index, filter).await
    };

    let book = db
        .book()
        .find_unique(book::id::equals(book_id))
        .with(book::book_annotation::fetch())
        .with(book::source::fetch())
        .with(
            book::book_authors::fetch(vec![])
                .with(book_author::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(
            book::translations::fetch(vec![])
                .with(translator::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(book::book_sequences::fetch(vec![]).with(book_sequence::sequence::fetch()))
        .with(
            book::book_genres::fetch(vec![])
                .with(book_genre::genre::fetch().with(genre::source::fetch())),
        )
        .exec()
        .await
        .unwrap()
        .unwrap();

    Json::<DetailBook>(book.into()).into_response()
}

pub async fn get_remote_book(
    db: Database,
    Path((source_id, remote_id)): Path<(i32, i32)>,
) -> impl IntoResponse {
    let book = db
        .book()
        .find_unique(book::source_id_remote_id(source_id, remote_id))
        .with(book::book_annotation::fetch())
        .with(book::source::fetch())
        .with(
            book::book_authors::fetch(vec![])
                .with(book_author::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(
            book::translations::fetch(vec![])
                .with(translator::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(book::book_sequences::fetch(vec![]).with(book_sequence::sequence::fetch()))
        .with(
            book::book_genres::fetch(vec![])
                .with(book_genre::genre::fetch().with(genre::source::fetch())),
        )
        .exec()
        .await
        .unwrap();

    match book {
        Some(book) => Json::<DetailBook>(book.into()).into_response(),
        None => StatusCode::NOT_FOUND.into_response(),
    }
}

pub async fn search_books(
    db: Database,
    Path(query): Path<String>,
    axum_extra::extract::Query(AllowedLangs { allowed_langs }): axum_extra::extract::Query<
        AllowedLangs,
    >,
    pagination: Query<Pagination>,
) -> impl IntoResponse {
    let client = get_meili_client();

    let book_index = client.index("books");

    let filter = format!("lang IN [{}]", allowed_langs.join(", "));

    let result = book_index
        .search()
        .with_query(&query)
        .with_filter(&filter)
        .with_offset(
            ((pagination.page - 1) * pagination.size)
                .try_into()
                .unwrap(),
        )
        .with_limit(pagination.size.try_into().unwrap())
        .execute::<BookMeili>()
        .await
        .unwrap();

    let total = result.estimated_total_hits.unwrap();
    let book_ids: Vec<i32> = result.hits.iter().map(|a| a.result.id).collect();

    let mut books = db
        .book()
        .find_many(vec![book::id::in_vec(book_ids.clone())])
        .with(book::book_annotation::fetch())
        .with(book::source::fetch())
        .with(
            book::book_authors::fetch(vec![])
                .with(book_author::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(
            book::translations::fetch(vec![])
                .with(translator::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(book::book_sequences::fetch(vec![]).with(book_sequence::sequence::fetch()))
        .exec()
        .await
        .unwrap();

    books.sort_by(|a, b| {
        let a_pos = book_ids.iter().position(|i| *i == a.id).unwrap();
        let b_pos = book_ids.iter().position(|i| *i == b.id).unwrap();

        a_pos.cmp(&b_pos)
    });

    let page: Page<Book> = Page::new(
        books.iter().map(|item| item.clone().into()).collect(),
        total.try_into().unwrap(),
        &pagination,
    );

    Json(page)
}

pub async fn get_book(db: Database, Path(book_id): Path<i32>) -> impl IntoResponse {
    let book = db
        .book()
        .find_unique(book::id::equals(book_id))
        .with(book::book_annotation::fetch())
        .with(book::source::fetch())
        .with(
            book::book_authors::fetch(vec![])
                .with(book_author::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(
            book::translations::fetch(vec![])
                .with(translator::author::fetch().with(author::author_annotation::fetch())),
        )
        .with(book::book_sequences::fetch(vec![]).with(book_sequence::sequence::fetch()))
        .with(
            book::book_genres::fetch(vec![])
                .with(book_genre::genre::fetch().with(genre::source::fetch())),
        )
        .exec()
        .await
        .unwrap();

    match book {
        Some(book) => Json::<DetailBook>(book.into()).into_response(),
        None => StatusCode::NOT_FOUND.into_response(),
    }
}

pub async fn get_book_annotation(db: Database, Path(book_id): Path<i32>) -> impl IntoResponse {
    let book_annotation = db
        .book_annotation()
        .find_unique(book_annotation::book_id::equals(book_id))
        .exec()
        .await
        .unwrap();

    match book_annotation {
        Some(book_annotation) => Json::<BookAnnotation>(book_annotation.into()).into_response(),
        None => StatusCode::NOT_FOUND.into_response(),
    }
}

pub async fn get_books_router() -> Router {
    Router::new()
        .route("/", get(get_books))
        .route("/base/", get(get_base_books))
        .route("/random", get(get_random_book))
        .route("/remote/:source_id/:remote_id", get(get_remote_book))
        .route("/search/:query", get(search_books))
        .route("/:book_id", get(get_book))
        .route("/:book_id/annotation", get(get_book_annotation))
}