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use crate::{error_hook, VmApiImpl};
use alloc::vec::Vec;
use elrond_wasm::{
    api::{EndpointArgumentApi, Handle},
    err_msg,
    types::BoxedBytes,
};

extern "C" {
    fn getNumArguments() -> i32;
    fn getArgumentLength(id: i32) -> i32;
    fn getArgument(id: i32, dstOffset: *mut u8) -> i32;

    // big int API
    fn bigIntNew(value: i64) -> i32;
    fn bigIntGetUnsignedArgument(arg_id: i32, dest: i32);
    fn bigIntGetSignedArgument(arg_id: i32, dest: i32);

    // small int API
    fn smallIntGetUnsignedArgument(id: i32) -> i64;
    fn smallIntGetSignedArgument(id: i32) -> i64;

    // managed buffer API
    fn mBufferNew() -> i32;
    fn mBufferGetArgument(argId: i32, mBufferHandle: i32) -> i32;
}

/// Interface to only be used by code generated by the macros.
/// The smart contract code doesn't have access to these methods directly.
impl EndpointArgumentApi for VmApiImpl {
    #[inline]
    fn get_num_arguments(&self) -> i32 {
        unsafe { getNumArguments() }
    }

    #[inline]
    fn get_argument_len(&self, arg_index: i32) -> usize {
        unsafe { getArgumentLength(arg_index) as usize }
    }

    fn copy_argument_to_slice(&self, arg_index: i32, slice: &mut [u8]) {
        unsafe {
            let byte_len = getArgument(arg_index, slice.as_mut_ptr()) as usize;
            if byte_len != slice.len() {
                error_hook::signal_error(err_msg::ARG_BAD_LENGTH);
            }
        }
    }

    fn get_argument_vec_u8(&self, arg_index: i32) -> Vec<u8> {
        let len = self.get_argument_len(arg_index);
        let mut res = Vec::with_capacity(len);
        if len > 0 {
            unsafe {
                res.set_len(len);
                getArgument(arg_index, res.as_mut_ptr());
            }
        }
        res
    }

    fn get_argument_boxed_bytes(&self, arg_index: i32) -> BoxedBytes {
        let len = self.get_argument_len(arg_index);
        unsafe {
            let mut res = BoxedBytes::allocate(len);
            if len > 0 {
                getArgument(arg_index, res.as_mut_ptr());
            }
            res
        }
    }

    #[inline]
    fn get_argument_big_uint_raw(&self, arg_id: i32) -> i32 {
        unsafe {
            let handle = bigIntNew(0);
            bigIntGetUnsignedArgument(arg_id, handle);
            handle
        }
    }

    #[inline]
    fn get_argument_big_int_raw(&self, arg_id: i32) -> i32 {
        unsafe {
            let handle = bigIntNew(0);
            bigIntGetSignedArgument(arg_id, handle);
            handle
        }
    }

    #[inline]
    fn get_argument_managed_buffer_raw(&self, arg_id: i32) -> Handle {
        unsafe {
            let handle = mBufferNew();
            mBufferGetArgument(arg_id, handle);
            handle
        }
    }

    #[inline]
    fn get_argument_u64(&self, arg_id: i32) -> u64 {
        unsafe { smallIntGetUnsignedArgument(arg_id) as u64 }
    }

    #[inline]
    fn get_argument_i64(&self, arg_id: i32) -> i64 {
        unsafe { smallIntGetSignedArgument(arg_id) }
    }
}