use lightning::chain::channelmonitor::CLOSED_CHANNEL_UPDATE_ID;
use lightning::events::ClosureReason;
use lightning::ln::functional_test_utils::{
	connect_block, create_announced_chan_between_nodes, create_chanmon_cfgs, create_dummy_block,
	create_network, create_node_cfgs, create_node_chanmgrs, send_payment,
};
use lightning::util::persist::{read_channel_monitors, KVStore, KVSTORE_NAMESPACE_KEY_MAX_LEN};
use lightning::util::test_utils;
use lightning::{check_added_monitors, check_closed_broadcast, check_closed_event};

use std::panic::RefUnwindSafe;

pub(crate) fn do_read_write_remove_list_persist<K: KVStore + RefUnwindSafe>(kv_store: &K) {
	let data = [42u8; 32];

	let primary_namespace = "testspace";
	let secondary_namespace = "testsubspace";
	let key = "testkey";

	// Test the basic KVStore operations.
	kv_store.write(primary_namespace, secondary_namespace, key, &data).unwrap();

	// Test empty primary_namespace/secondary_namespace is allowed, but not empty primary_namespace
	// and non-empty secondary_namespace, and not empty key.
	kv_store.write("", "", key, &data).unwrap();
	let res = std::panic::catch_unwind(|| kv_store.write("", secondary_namespace, key, &data));
	assert!(res.is_err());
	let res = std::panic::catch_unwind(|| {
		kv_store.write(primary_namespace, secondary_namespace, "", &data)
	});
	assert!(res.is_err());

	let listed_keys = kv_store.list(primary_namespace, secondary_namespace).unwrap();
	assert_eq!(listed_keys.len(), 1);
	assert_eq!(listed_keys[0], key);

	let read_data = kv_store.read(primary_namespace, secondary_namespace, key).unwrap();
	assert_eq!(data, &*read_data);

	kv_store.remove(primary_namespace, secondary_namespace, key, false).unwrap();

	let listed_keys = kv_store.list(primary_namespace, secondary_namespace).unwrap();
	assert_eq!(listed_keys.len(), 0);

	// Ensure we have no issue operating with primary_namespace/secondary_namespace/key being
	// KVSTORE_NAMESPACE_KEY_MAX_LEN
	let max_chars: String = std::iter::repeat('A').take(KVSTORE_NAMESPACE_KEY_MAX_LEN).collect();
	kv_store.write(&max_chars, &max_chars, &max_chars, &data).unwrap();

	let listed_keys = kv_store.list(&max_chars, &max_chars).unwrap();
	assert_eq!(listed_keys.len(), 1);
	assert_eq!(listed_keys[0], max_chars);

	let read_data = kv_store.read(&max_chars, &max_chars, &max_chars).unwrap();
	assert_eq!(data, &*read_data);

	kv_store.remove(&max_chars, &max_chars, &max_chars, false).unwrap();

	let listed_keys = kv_store.list(&max_chars, &max_chars).unwrap();
	assert_eq!(listed_keys.len(), 0);
}

// Integration-test the given KVStore implementation. Test relaying a few payments and check that
// the persisted data is updated the appropriate number of times.
pub(crate) fn do_test_store<K: KVStore>(store_0: &K, store_1: &K) {
	let chanmon_cfgs = create_chanmon_cfgs(2);
	let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let chain_mon_0 = test_utils::TestChainMonitor::new(
		Some(&chanmon_cfgs[0].chain_source),
		&chanmon_cfgs[0].tx_broadcaster,
		&chanmon_cfgs[0].logger,
		&chanmon_cfgs[0].fee_estimator,
		store_0,
		node_cfgs[0].keys_manager,
	);
	let chain_mon_1 = test_utils::TestChainMonitor::new(
		Some(&chanmon_cfgs[1].chain_source),
		&chanmon_cfgs[1].tx_broadcaster,
		&chanmon_cfgs[1].logger,
		&chanmon_cfgs[1].fee_estimator,
		store_1,
		node_cfgs[1].keys_manager,
	);
	node_cfgs[0].chain_monitor = chain_mon_0;
	node_cfgs[1].chain_monitor = chain_mon_1;
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

	// Check that the persisted channel data is empty before any channels are
	// open.
	let mut persisted_chan_data_0 =
		read_channel_monitors(store_0, nodes[0].keys_manager, nodes[0].keys_manager).unwrap();
	assert_eq!(persisted_chan_data_0.len(), 0);
	let mut persisted_chan_data_1 =
		read_channel_monitors(store_1, nodes[1].keys_manager, nodes[1].keys_manager).unwrap();
	assert_eq!(persisted_chan_data_1.len(), 0);

	// Helper to make sure the channel is on the expected update ID.
	macro_rules! check_persisted_data {
		($expected_update_id: expr) => {
			persisted_chan_data_0 =
				read_channel_monitors(store_0, nodes[0].keys_manager, nodes[0].keys_manager)
					.unwrap();
			assert_eq!(persisted_chan_data_0.len(), 1);
			for (_, mon) in persisted_chan_data_0.iter() {
				assert_eq!(mon.get_latest_update_id(), $expected_update_id);
			}
			persisted_chan_data_1 =
				read_channel_monitors(store_1, nodes[1].keys_manager, nodes[1].keys_manager)
					.unwrap();
			assert_eq!(persisted_chan_data_1.len(), 1);
			for (_, mon) in persisted_chan_data_1.iter() {
				assert_eq!(mon.get_latest_update_id(), $expected_update_id);
			}
		};
	}

	// Create some initial channel and check that a channel was persisted.
	let _ = create_announced_chan_between_nodes(&nodes, 0, 1);
	check_persisted_data!(0);

	// Send a few payments and make sure the monitors are updated to the latest.
	send_payment(&nodes[0], &vec![&nodes[1]][..], 8000000);
	check_persisted_data!(5);
	send_payment(&nodes[1], &vec![&nodes[0]][..], 4000000);
	check_persisted_data!(10);

	// Force close because cooperative close doesn't result in any persisted
	// updates.
	let error_message = "Channel force-closed";
	nodes[0]
		.node
		.force_close_broadcasting_latest_txn(
			&nodes[0].node.list_channels()[0].channel_id,
			&nodes[1].node.get_our_node_id(),
			error_message.to_string(),
		)
		.unwrap();
	check_closed_event!(
		nodes[0],
		1,
		ClosureReason::HolderForceClosed { broadcasted_latest_txn: Some(true) },
		[nodes[1].node.get_our_node_id()],
		100000
	);
	check_closed_broadcast!(nodes[0], true);
	check_added_monitors!(nodes[0], 1);

	let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
	assert_eq!(node_txn.len(), 1);

	connect_block(
		&nodes[1],
		&create_dummy_block(
			nodes[0].best_block_hash(),
			42,
			vec![node_txn[0].clone(), node_txn[0].clone()],
		),
	);
	check_closed_broadcast!(nodes[1], true);
	check_closed_event!(
		nodes[1],
		1,
		ClosureReason::CommitmentTxConfirmed,
		[nodes[0].node.get_our_node_id()],
		100000
	);
	check_added_monitors!(nodes[1], 1);

	// Make sure everything is persisted as expected after close.
	check_persisted_data!(CLOSED_CHANNEL_UPDATE_ID);
}