// This file is part of Bizinikiwi.

// Copyright (C) Parity Technologies (UK) Ltd. and Dijital Kurdistan Tech Institute
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![no_std]
#![no_main]
include!("../panic_handler.rs");

use uapi::{u256_bytes, u64_output, HostFn, HostFnImpl as api};

#[no_mangle]
#[polkavm_derive::polkavm_export]
pub extern "C" fn deploy() {}

#[no_mangle]
#[polkavm_derive::polkavm_export]
pub extern "C" fn call() {
	let balance = u64_output!(api::balance,);

	let mut output_buf = [0u8; 32];
	let output = &mut &mut output_buf[..];
	let _ = api::call(
		uapi::CallFlags::READ_ONLY,
		&uapi::SYSTEM_PRECOMPILE_ADDR,
		u64::MAX,       // How much ref_time to devote for the execution. u64::MAX = use all.
		u64::MAX,       // How much proof_size to devote for the execution. u64::MAX = use all.
		&[u8::MAX; 32], // No deposit limit.
		&[0u8; 32],     // Value transferred to the contract.
		&uapi::solidity_selector("minimumBalance()"),
		Some(output),
	).unwrap();
	assert_ne!(output_buf, [0u8; 32]);

	let mut u64_buf = [0u8; 8];
	u64_buf[..8].copy_from_slice(&output_buf[24..32]);
	let minimum_balance = u64::from_be_bytes(u64_buf);

	// Make the transferred value exceed the balance by adding the minimum balance.
	let balance = balance + minimum_balance;

	// Try to self-destruct by sending more balance to the 0 address.
	// The call will fail because a contract transfer has a keep alive requirement.
	let res = api::call(
		uapi::CallFlags::empty(),
		&[0u8; 20],
		0,
		0,
		&[u8::MAX; 32],
		&u256_bytes(balance),
		&[],
		None,
	);
	assert!(matches!(res, Err(uapi::ReturnErrorCode::TransferFailed)));
}