#[macro_use]
extern crate diesel;
#[macro_use]
extern crate diesel_migrations;

use std::str::FromStr;

use anyhow::Context;
use actix_web::{web, App, HttpServer, HttpResponse, Responder, Result};

mod db;
mod model;
mod schema;

use crate::db::DbPool;

embed_migrations!("migrations");

#[derive(Debug, serde::Deserialize)]
pub struct PersonCreateRequestData {
    name: String,
    age: i32,

    country: String,
    city: String,
    street: String,
    number: i32,
}

#[derive(Debug, serde::Serialize)]
pub struct PersonCreateResponse {
    id: i32
}

async fn create_person(db: web::Data<DbPool>, person: web::Json<PersonCreateRequestData>) -> impl Responder {
    log::debug!("Creating person = {:?}", person);

    let inner = |db: &DbPool, person: &PersonCreateRequestData| {
        let country = crate::model::Country::create_or_fetch(&db, &person.country)?;
        let city = crate::model::City::create_or_fetch(&db, &person.city)?;
        let street = crate::model::Street::create_or_fetch(&db, &person.street)?;
        let address = crate::model::Address::create_or_fetch(&db, &country, &city, &street, person.number)?;
        let person = crate::model::Person::create_or_fetch(&db, &address, &person.name, person.age)?;
        Ok(person.id())
    };

    inner(&db, &person)
        .map_err(|anyhow_error: anyhow::Error| {
            log::error!("{}", anyhow_error);
            HttpResponse::build(actix_web::http::StatusCode::INTERNAL_SERVER_ERROR).finish()
        })
        .map(|id| HttpResponse::Ok().json(PersonCreateResponse { id }))
}


#[actix_web::main]
async fn main() -> anyhow::Result<()> {
    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
    let bind = std::env::var("HOST").expect("environment: HOST variable not set");
    let port = std::env::var("PORT")
        .as_ref()
        .map(|p| u16::from_str(p))
        .expect("environment: PORT variable not set")
        .context("Failed to parse port as integer")?;

    let db_connection_pool = crate::db::establish_connection();

    {
        let conn = db_connection_pool.get().expect("Failed to get connection from pool");
        embedded_migrations::run_with_output(&conn, &mut std::io::stdout())?;
    } // drop `conn` here

    HttpServer::new(move || {
        App::new()
            .data(db_connection_pool.clone())
            .route("/create", web::post().to(create_person))
    })
    .bind(format!("{}:{}", bind, port))?
    .run()
    .await
    .map_err(anyhow::Error::from)
}