use crate::domain::SubscriberEmail;
use crate::domain::{NewSubscriber, SubscriberName};
use axum::extract::State;
use axum::routing::post;
use axum::Form;
use axum::Router;
use axum::{
    http::StatusCode,
    response::{IntoResponse, Response},
};
use chrono::Utc;
use serde::Deserialize;
use sqlx::PgPool;
use uuid::Uuid;

#[derive(Debug, Deserialize)]
struct FormData {
    email: String,
    name: String,
}

#[tracing::instrument(
    name = "Adding a new subscriber",
    skip(form, pool),
    fields(
        request_id = %Uuid::new_v4(),
        subscriber_email = %form.email,
        subscriber_name = %form.name
    )
)]
pub async fn subscribe(State(pool): State<PgPool>, Form(form): Form<FormData>) -> Response {
    let name = match SubscriberName::parse(form.name) {
        Ok(name) => name,
        Err(_) => {
            return (StatusCode::BAD_REQUEST, "Invalid name").into_response();
        }
    };
    let email = match SubscriberEmail::parse(form.email) {
        Ok(email) => email,
        Err(_) => {
            return (StatusCode::BAD_REQUEST, "Invalid email address").into_response();
        }
    };
    let new_subscriber = NewSubscriber { email, name };
    match insert_subscriber(&pool, &new_subscriber).await {
        Ok(_) => {
            return (StatusCode::OK,).into_response();
        }
        Err(_) => {
            return (StatusCode::INTERNAL_SERVER_ERROR, "Something went wrong").into_response();
        }
    }
}

#[tracing::instrument(
    name = "Saving new subscriber details in the database",
    skip(new_subscriber, pool)
)]
pub async fn insert_subscriber(
    pool: &PgPool,
    new_subscriber: &NewSubscriber,
) -> Result<(), sqlx::Error> {
    let _ = sqlx::query!(
        r#"
            INSERT INTO subscriptions (id, email, name, subscribed_at)
            VALUES ($1, $2, $3, $4)
            "#,
        Uuid::new_v4(),
        new_subscriber.email.as_ref(),
        new_subscriber.name.as_ref(),
        Utc::now()
    )
    // We use `get_ref` to get an immutable reference to the `PgConnection`
    // wrapped by `web::Data`.
    .execute(pool)
    .await
    .map_err(|e| {
        tracing::error!("Failed to execute query: {:?}", e);
        e
    });
    Ok(())
}

pub fn routes_subscriptions(pool: PgPool) -> Router {
    Router::new()
        .route("/subscriptions", post(subscribe))
        .with_state(pool)
}