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use std::ptr;

use log::trace;

use crate::TryIntoJs;
use crate::sys::napi_value;
use crate::sys::napi_env;
use crate::val::JsEnv;
use crate::NjError;


/// pass rust byte arry as Node.js ArrayBuffer
pub struct ArrayBuffer{
    data: Vec<u8>
}

impl ArrayBuffer {

    pub fn new(data: Vec<u8>) -> Self {
        Self { data}
    }

    extern "C" fn finalize_buffer(_env: napi_env,_finalize_data: *mut ::std::os::raw::c_void,
        finalize_hint: *mut ::std::os::raw::c_void
    ) {

        trace!("finalize array buffer");
        unsafe {
            // use hint to reconstruct box instead of finalize data
            let ptr: *mut Vec<u8> = finalize_hint as *mut Vec<u8>;
            let _rust = Box::from_raw(ptr);
        }
        
    }

}

impl TryIntoJs for ArrayBuffer {

    fn try_to_js(self, js_env: &JsEnv) -> Result<napi_value,NjError> {

        let len = self.data.len();

        let box_data = Box::new(self.data);

        let mut napi_buffer = ptr::null_mut();
        
        // get pointer to vec's buffer
        let data_buffer = box_data.as_ptr();

        // get raw pointer to box, this will be used to reconstruct box
        let data_box_ptr = Box::into_raw(box_data) as *mut core::ffi::c_void;

        crate::napi_call_result!(
            crate::sys::napi_create_external_arraybuffer(
                js_env.inner(),
                data_buffer as *mut core::ffi::c_void ,
                len,
                Some(Self::finalize_buffer),
                data_box_ptr,
                &mut napi_buffer
            )
        )?;

        Ok(napi_buffer)

    }
}

use std::fmt;
use std::fmt::Debug;

impl Debug for ArrayBuffer {
   
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_fmt(format_args!("ArrayBuffer len: {}",self.data.len()))
    }

}