use std::time::Duration;

use axum::{http::HeaderMap, response::IntoResponse, Extension, Json};
use tetratto_core::model::{auth::Notification, permissions::FinePermission, ApiReturn, Error};
use stripe::{EventObject, EventType};
use crate::State;

pub async fn stripe_webhook(
    Extension(data): Extension<State>,
    headers: HeaderMap,
    body: String,
) -> impl IntoResponse {
    let data = &(data.read().await).0;

    if data.0.stripe.is_none() {
        return Json(Error::MiscError("Disabled".to_string()).into());
    }

    let sig = match headers.get("Stripe-Signature") {
        Some(s) => s,
        None => return Json(Error::NotAllowed.into()),
    };

    let req = match stripe::Webhook::construct_event(
        &body,
        &sig.to_str().unwrap(),
        &data.0.stripe.as_ref().unwrap().webhook_signing_secret,
    ) {
        Ok(e) => e,
        Err(e) => return Json(Error::MiscError(e.to_string()).into()),
    };

    match req.type_ {
        EventType::CheckoutSessionCompleted => {
            // checkout session ended, store user customer id (from stripe) in their user data
            let session = match req.data.object {
                EventObject::CheckoutSession(c) => c,
                _ => unreachable!("cannot be this"),
            };

            let user_id = session
                .client_reference_id
                .unwrap()
                .parse::<usize>()
                .unwrap();

            let customer_id = session.customer.unwrap().id();

            let user = match data.get_user_by_id(user_id).await {
                Ok(ua) => ua,
                Err(e) => return Json(e.into()),
            };

            tracing::info!("subscribe {} (stripe: {})", user.id, customer_id);
            if let Err(e) = data
                .update_user_stripe_id(user.id, customer_id.as_str())
                .await
            {
                return Json(e.into());
            }
        }
        EventType::InvoicePaymentSucceeded => {
            // payment finished and subscription created
            // we're doing this *instead* of CustomerSubscriptionDeleted because
            // the invoice happens *after* the checkout session ends... which is what we need
            let invoice = match req.data.object {
                EventObject::Invoice(c) => c,
                _ => unreachable!("cannot be this"),
            };

            let customer_id = invoice.customer.unwrap().id();

            // allow 30s for everything to finalize
            tokio::time::sleep(Duration::from_secs(30)).await;

            // pull user and update role
            let user = match data.get_user_by_stripe_id(customer_id.as_str()).await {
                Ok(ua) => ua,
                Err(e) => return Json(e.into()),
            };

            if user.permissions.check(FinePermission::SUPPORTER) {
                return Json(ApiReturn {
                    ok: true,
                    message: "Already applied".to_string(),
                    payload: (),
                });
            }

            tracing::info!("invoice {} (stripe: {})", user.id, customer_id);
            let new_user_permissions = user.permissions | FinePermission::SUPPORTER;

            if let Err(e) = data
                .update_user_role(user.id, new_user_permissions, user.clone(), true)
                .await
            {
                return Json(e.into());
            }

            if let Err(e) = data
                .create_notification(Notification::new(
                    "Welcome new supporter!".to_string(),
                    "Thank you for your support! Your account has been updated with your new role."
                        .to_string(),
                    user.id,
                ))
                .await
            {
                return Json(e.into());
            }
        }
        EventType::CustomerSubscriptionDeleted => {
            // payment failed and subscription deleted
            let subscription = match req.data.object {
                EventObject::Subscription(c) => c,
                _ => unreachable!("cannot be this"),
            };

            let customer_id = subscription.customer.id();

            let user = match data.get_user_by_stripe_id(customer_id.as_str()).await {
                Ok(ua) => ua,
                Err(e) => return Json(e.into()),
            };

            tracing::info!("unsubscribe {} (stripe: {})", user.id, customer_id);
            let new_user_permissions = user.permissions - FinePermission::SUPPORTER;

            if let Err(e) = data
                .update_user_role(user.id, new_user_permissions, user.clone(), true)
                .await
            {
                return Json(e.into());
            }

            if let Err(e) = data
                .create_notification(Notification::new(
                    "Sorry to see you go... :(".to_string(),
                    "Thank you for your past support! Please feel free to leave us feedback on why you decided to cancel."
                        .to_string(),
                    user.id,
                ))
                .await
            {
                return Json(e.into());
            }
        }
        _ => return Json(Error::Unknown.into()),
    }

    Json(ApiReturn {
        ok: true,
        message: "Acceptable".to_string(),
        payload: (),
    })
}