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use crate::ArwenApiImpl;
use alloc::vec::Vec;
use elrond_wasm::api::{StorageReadApi, StorageWriteApi};
use elrond_wasm::types::BoxedBytes;

#[rustfmt::skip]
extern "C" {
	// general
	fn storageStore(keyOffset: *const u8, keyLength: i32, dataOffset: *const u8, dataLength: i32) -> i32;
	fn storageLoadLength(keyOffset: *const u8, keyLength: i32) -> i32;
	fn storageLoad(keyOffset: *const u8, keyLength: i32, dataOffset: *mut u8) -> i32;

	// big int API
	fn bigIntNew(value: i64) -> i32;
	fn bigIntStorageStoreUnsigned(keyOffset: *const u8, keyLength: i32, source: i32) -> i32;
	fn bigIntStorageLoadUnsigned(keyOffset: *const u8, keyLength: i32, destination: i32) -> i32;

	// small int API
	fn smallIntStorageStoreUnsigned(keyOffset: *const u8, keyLength: i32, value: i64) -> i32;
	fn smallIntStorageStoreSigned(keyOffset: *const u8, keyLength: i32, value: i64) -> i32;
	fn smallIntStorageLoadUnsigned(keyOffset: *const u8, keyLength: i32) -> i64;
	fn smallIntStorageLoadSigned(keyOffset: *const u8, keyLength: i32) -> i64;
}

impl StorageReadApi for ArwenApiImpl {
	#[inline]
	fn storage_load_len(&self, key: &[u8]) -> usize {
		unsafe { storageLoadLength(key.as_ref().as_ptr(), key.len() as i32) as usize }
	}

	fn storage_load_vec_u8(&self, key: &[u8]) -> Vec<u8> {
		unsafe {
			let value_len = self.storage_load_len(key);
			let mut res = Vec::with_capacity(value_len);
			storageLoad(key.as_ref().as_ptr(), key.len() as i32, res.as_mut_ptr());
			res.set_len(value_len);
			res
		}
	}

	fn storage_load_boxed_bytes(&self, key: &[u8]) -> BoxedBytes {
		let len = self.storage_load_len(key);
		unsafe {
			let mut res = BoxedBytes::allocate(len);
			if len > 0 {
				storageLoad(key.as_ref().as_ptr(), key.len() as i32, res.as_mut_ptr());
			}
			res
		}
	}

	#[inline]
	fn storage_load_big_uint_raw(&self, key: &[u8]) -> i32 {
		unsafe {
			let handle = bigIntNew(0);
			bigIntStorageLoadUnsigned(key.as_ref().as_ptr(), key.len() as i32, handle);
			handle
		}
	}

	#[inline]
	fn storage_load_u64(&self, key: &[u8]) -> u64 {
		unsafe { smallIntStorageLoadUnsigned(key.as_ref().as_ptr(), key.len() as i32) as u64 }
	}

	#[inline]
	fn storage_load_i64(&self, key: &[u8]) -> i64 {
		unsafe { smallIntStorageLoadSigned(key.as_ref().as_ptr(), key.len() as i32) }
	}
}

impl StorageWriteApi for ArwenApiImpl {
	fn storage_store_slice_u8(&self, key: &[u8], value: &[u8]) {
		unsafe {
			storageStore(
				key.as_ref().as_ptr(),
				key.len() as i32,
				value.as_ptr(),
				value.len() as i32,
			);
		}
	}

	#[inline]
	fn storage_store_big_uint_raw(&self, key: &[u8], handle: i32) {
		unsafe {
			bigIntStorageStoreUnsigned(key.as_ref().as_ptr(), key.len() as i32, handle);
		}
	}

	#[inline]
	fn storage_store_u64(&self, key: &[u8], value: u64) {
		unsafe {
			smallIntStorageStoreUnsigned(key.as_ref().as_ptr(), key.len() as i32, value as i64);
		}
	}

	#[inline]
	fn storage_store_i64(&self, key: &[u8], value: i64) {
		unsafe {
			smallIntStorageStoreSigned(key.as_ref().as_ptr(), key.len() as i32, value);
		}
	}
}