use std::sync::Arc;

use axum::{extract::{Path, State}, Json};
use reqwest::{StatusCode};
use sea_orm::{ActiveModelTrait, ActiveValue::{NotSet, Set}, EntityTrait, TryIntoModel};
use serde::{Deserialize, Serialize};
use utoipa::IntoParams;

use crate::{entities::{book_instance, prelude::*}, routes::auth::Claims, utils::auth::{user_is_bal_owner, user_is_book_instance_owner}, AppState};


#[derive(IntoParams)]
#[into_params(names("id"), parameter_in = Path)]
#[allow(dead_code)]
struct BookInstanceByIdParams(u32);

#[axum::debug_handler]
#[utoipa::path(
    get,
    path = "/book_instance/{id}",
    params(BookInstanceByIdParams),
    security(("jwt" = [])),
    responses(
        (status = OK, body = book_instance::Model, description = "Found book instance with corresponding ID in the database"),
        (status = NOT_FOUND, description = "No book instance with this id exists in the database")
    ),
    summary = "Get a book instance by its ID",
    description = "Get a book instance from its ID",
    tag = "book-instance-api",
)]
pub async fn get_book_instance_by_id(
    State(state): State<Arc<AppState>>,
    Path(id): Path<u32>,
) -> (StatusCode, Json<Option<book_instance::Model>>) {
    if let Ok(Some(res)) = BookInstance::find_by_id(id).one(state.db_conn.as_ref()).await {
        (StatusCode::OK, Json(Some(res)))
    } else {
        (StatusCode::NOT_FOUND, Json(None))
    }
}

#[derive(Deserialize, Serialize, utoipa::ToSchema)]
pub struct BookInstanceCreateParams {
    book_id: u32,
    owner_id: u32,
    bal_id: u32,
    price: i32,
}

#[axum::debug_handler]
#[utoipa::path(
    post,
    path = "/book_instance",
    request_body = BookInstanceCreateParams,
    security(("jwt" = [])),
    responses(
        (status = OK, body = book_instance::Model, description = "Successfully created book instance"),
        (status = FORBIDDEN, description = "You don't own the specified BAL"),
    ),
    summary = "Create a new book instance",
    description = "Create a new book instance",
    tag = "book-instance-api",
)]
pub async fn create_book_instance(
    State(state): State<Arc<AppState>>,
    claims: Claims,
    Json(instance_payload): Json<BookInstanceCreateParams>,
) -> (StatusCode, Json<Option<book_instance::Model>>) {
    if !user_is_bal_owner(claims.user_id, instance_payload.bal_id, state.db_conn.as_ref()).await {
        return (StatusCode::FORBIDDEN, Json(None));
    }

    let book_instance = book_instance::ActiveModel {
        book_id: Set(instance_payload.book_id),
        owner_id: Set(instance_payload.owner_id),
        bal_id: Set(instance_payload.bal_id),
        price: Set(instance_payload.price),
        status: Set(book_instance::BookStatus::Available),
        ..Default::default()
    };

    let b = book_instance.save(state.db_conn.as_ref()).await;
    match b {
        Err(e) => {
            log::error!(target: "api", "Error while inserting new book instance: {:#?}", e);
            (StatusCode::BAD_REQUEST, Json(None))
        },
        Ok(res) => (StatusCode::OK, Json(Some(res.try_into_model().expect("All fields should be set once the book instance is saved"))))
    }
}

#[derive(Deserialize, Serialize, utoipa::ToSchema)]
pub struct BookInstanceUpdateParams {
    status: Option<book_instance::BookStatus>,
    owner_id: Option<u32>,
    price: Option<i32>,
}

#[axum::debug_handler]
#[utoipa::path(
    patch,
    path = "/book_instance/{id}",
    params(BookInstanceByIdParams),
    request_body = BookInstanceUpdateParams,
    security(("jwt" = [])),
    responses(
        (status = OK, body = book_instance::Model, description = "Successfully updated book instance"),
        (status = NOT_FOUND, description = "No book instance with specified id was found"),
        (status = FORBIDDEN, description = "You don't own the specified book instance"),
    ),
    summary = "Update a book instance",
    description = "Update a book instance",
    tag = "book-instance-api",
)]
pub async fn update_book_instance(
    State(state): State<Arc<AppState>>,
    claims: Claims,
    Path(id): Path<u32>,
    Json(instance_payload): Json<BookInstanceUpdateParams>,
) -> (StatusCode, Json<Option<book_instance::Model>>) {
    if !user_is_book_instance_owner(claims.user_id, id, state.db_conn.as_ref()).await {
        return (StatusCode::FORBIDDEN, Json(None));
    }

    if let Ok(Some(book_instance)) = BookInstance::find_by_id(id).one(state.db_conn.as_ref()).await {
        let mut book_instance: book_instance::ActiveModel = book_instance.into();
        book_instance.price = match instance_payload.price {
            None => book_instance.price,
            Some(v) => Set(v)
        };
        book_instance.owner_id = match instance_payload.owner_id {
            None => book_instance.owner_id,
            Some(v) => Set(v)
        };
        book_instance.status = match instance_payload.status {
            None => book_instance.status,
            Some(v) => Set(v)
        };
        
        match book_instance.update(state.db_conn.as_ref()).await {
            Err(e) => {
                log::error!(target: "api", "Error while updating book instance from api: {:#?}", e);
                (StatusCode::INTERNAL_SERVER_ERROR, Json(None))
            },
            Ok(res) => {
                let model = res.try_into_model().expect("All fields should be set once the book instance is saved");
                (StatusCode::OK, Json(Some(model)))
            }
        }
    } else {
        (StatusCode::NOT_FOUND, Json(None))
    }
}

#[derive(Deserialize, Serialize, utoipa::ToSchema)]
pub struct BookInstanceSaleParams {
    price: i32,
}

#[axum::debug_handler]
#[utoipa::path(
    post,
    path = "/book_instance/{id}/sell",
    params(BookInstanceByIdParams),
    request_body = BookInstanceSaleParams,
    security(("jwt" = [])),
    responses(
        (status = OK, body = book_instance::Model, description = "Successfully sold book instance"),
        (status = NOT_FOUND, description = "No book instance with specified id was found"),
    ),
    summary = "Sell a book instance",
    description = "Sell a book instance",
    tag = "book-instance-api",
)]
pub async fn sell_book_instance(
    State(state): State<Arc<AppState>>,
    claims: Claims,
    Path(id): Path<u32>,
    Json(instance_payload): Json<BookInstanceSaleParams>,
) -> (StatusCode, Json<Option<book_instance::Model>>) {
    if !user_is_book_instance_owner(claims.user_id, id, state.db_conn.as_ref()).await {
        return (StatusCode::FORBIDDEN, Json(None));
    }

    if let Ok(Some(book_instance)) = BookInstance::find_by_id(id).one(state.db_conn.as_ref()).await {
        let mut book_instance: book_instance::ActiveModel = book_instance.into();
        book_instance.sold_price = Set(Some(instance_payload.price));
        book_instance.status = Set(book_instance::BookStatus::Sold);
        
        match book_instance.update(state.db_conn.as_ref()).await {
            Err(e) => {
                log::error!(target: "api", "Error while selling book instance from api: {:#?}", e);
                (StatusCode::INTERNAL_SERVER_ERROR, Json(None))
            },
            Ok(res) => {
                let model = res.try_into_model().expect("All fields should be set once the book instance is saved");
                (StatusCode::OK, Json(Some(model)))
            }
        }
    } else {
        (StatusCode::NOT_FOUND, Json(None))
    }
}

#[axum::debug_handler]
#[utoipa::path(
    post,
    path = "/book_instance/bulk",
    request_body = Vec<BookInstanceCreateParams>,
    security(("jwt" = [])),
    responses(
        (status = OK, description = "Successfully created book instances"),
        (status = FORBIDDEN, description = "You don't own at least one specified bal of the book instances sent"),
    ),
    summary = "Create new book instances in bulk",
    description = "Create new book instances in bulk",
    tag = "book-instance-api",
)]
pub async fn bulk_create_book_instance(
    State(state): State<Arc<AppState>>,
    claims: Claims,
    Json(instance_payload): Json<Vec<BookInstanceCreateParams>>,
) -> StatusCode {
    for i in &instance_payload {
        if !user_is_bal_owner(claims.user_id, i.bal_id, state.db_conn.as_ref()).await {
            return StatusCode::FORBIDDEN;
        }
    }

     let instances = instance_payload
        .into_iter()
        .map(|p| {
            book_instance::ActiveModel {
                book_id: Set(p.book_id),
                owner_id: Set(p.owner_id),
                bal_id: Set(p.bal_id),
                price: Set(p.price),
                status: Set(book_instance::BookStatus::Available),
                id: NotSet,
                sold_price: NotSet
            }
        });

    match BookInstance::insert_many(instances).exec(state.db_conn.as_ref()).await {
        Err(e) => {
            log::error!(target: "api", "Error while bulk inserting new book instances: {:#?}", e);
            StatusCode::INTERNAL_SERVER_ERROR
        },
        Ok(_) => StatusCode::OK
    }
}