use anyhow::Result;
use wasmtime::*;

fn main() -> Result<()> {
	let engine = Engine::default ();
	
	let module = Module::from_file (&engine, "wasm_guest/pkg/wasm_guest_bg.wasm")?;
	
	let linker = Linker::new (&engine);
	
	let mut store = Store::new (&engine, ());
	let instance = linker.instantiate (&mut store, &module)?;
	
	{
		let malloc = instance.get_typed_func::<(i32), (i32), _> (&mut store, "our_malloc")?;
		let parse_string = instance.get_typed_func::<(i32, i32), (f64), _> (&mut store, "parse_string")?;
		
		let memory = instance.get_memory (&mut store, "memory").unwrap ();
		
		let s = "{\"bogus\": 42}";
		
		let ptr = malloc.call (&mut store, (s.len () as i32))?;
		dbg! (ptr);
		
		memory.write (&mut store, ptr as usize, s.as_bytes ());
		
		dbg! (parse_string.call (&mut store, (ptr, s.len () as i32))?);
	}
	
	Ok(())
}