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// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

use diem_events_fetcher::DiemEventsFetcher;
use diem_sdk::{client::views::EventDataView, transaction_builder::Currency};
use forge::{PublicUsageContext, PublicUsageTest, Result, Test};

pub struct EventFetcher;

impl Test for EventFetcher {
    fn name(&self) -> &'static str {
        "smoke-test::event-fetcher"
    }
}

impl PublicUsageTest for EventFetcher {
    fn run<'t>(&self, ctx: &mut PublicUsageContext<'t>) -> Result<()> {
        let runtime = tokio::runtime::Builder::new_current_thread()
            .enable_all()
            .build()?;
        runtime.block_on(self.async_run(ctx))
    }
}

impl EventFetcher {
    async fn async_run(&self, ctx: &mut PublicUsageContext<'_>) -> Result<()> {
        let client = ctx.rest_client();
        let factory = ctx.transaction_factory();

        let mut account1 = ctx.random_account();

        ctx.create_parent_vasp_account(account1.authentication_key())
            .await?;
        ctx.fund(account1.address(), 100_000_000).await?;

        let account2 = ctx.random_account();
        ctx.create_parent_vasp_account(account2.authentication_key())
            .await?;
        ctx.fund(account2.address(), 100_000_000).await?;

        let txn = account1.sign_with_transaction_builder(factory.peer_to_peer(
            Currency::XUS,
            account2.address(),
            3_000_000,
        ));
        client.submit_and_wait(&txn).await?;

        let txn = account1.sign_with_transaction_builder(factory.peer_to_peer(
            Currency::XUS,
            account2.address(),
            4_000_000,
        ));
        client.submit_and_wait(&txn).await?;

        let events_fetcher = DiemEventsFetcher::new(ctx.url())?;

        let (sent_handle, received_handle) = events_fetcher
            .get_payment_event_handles(account1.address())
            .await
            .unwrap()
            .unwrap();
        let mut sent_events = events_fetcher.get_all_events(&sent_handle).await.unwrap();
        let received_events = events_fetcher
            .get_all_events(&received_handle)
            .await
            .unwrap();

        assert_eq!(received_events.len(), 1);
        assert_eq!(received_handle.count(), 1);
        assert_eq!(sent_handle.count(), 2);
        assert_eq!(sent_events.len(), 2);
        let evt1 = sent_events.pop().unwrap();
        let evt2 = sent_events.pop().unwrap();

        if let EventDataView::SentPayment { amount, .. } = evt1.data {
            assert_eq!(amount.amount, 4000000);
        } else {
            panic!("invalid event");
        }

        if let EventDataView::SentPayment { amount, .. } = evt2.data {
            assert_eq!(amount.amount, 3000000);
        } else {
            panic!("invalid event");
        }

        Ok(())
    }
}