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use crate::{ffi, Bitmap};
use std::ptr::null_mut;

pub struct BitmapGlyph {
	library_raw: ffi::FT_Library,
	raw: ffi::FT_BitmapGlyph,
}

impl BitmapGlyph {
	pub unsafe fn from_raw(library_raw: ffi::FT_Library, raw: ffi::FT_BitmapGlyph) -> Self {
		ffi::FT_Reference_Library(library_raw);
		BitmapGlyph { library_raw, raw }
	}

	#[inline(always)]
	pub fn left(&self) -> i32 {
		unsafe { (*self.raw).left }
	}

	#[inline(always)]
	pub fn top(&self) -> i32 {
		unsafe { (*self.raw).top }
	}

	#[inline(always)]
	pub fn bitmap(&self) -> Bitmap {
		unsafe { Bitmap::from_raw(&(*self.raw).bitmap) }
	}

	#[inline(always)]
	pub fn raw(&self) -> &ffi::FT_BitmapGlyphRec {
		unsafe { &*self.raw }
	}
}

impl Clone for BitmapGlyph {
	fn clone(&self) -> Self {
		let mut target = null_mut();

		let err = unsafe { ffi::FT_Glyph_Copy(self.raw as ffi::FT_Glyph, &mut target) };
		if err == ffi::FT_Err_Ok {
			unsafe { BitmapGlyph::from_raw(self.library_raw, target as ffi::FT_BitmapGlyph) }
		} else {
			panic!("Failed to copy bitmap glyph")
		}
	}
}

impl Drop for BitmapGlyph {
	fn drop(&mut self) {
		let err = unsafe {
			ffi::FT_Done_Glyph(self.raw as ffi::FT_Glyph);
			ffi::FT_Done_Library(self.library_raw)
		};
		if err != ffi::FT_Err_Ok {
			panic!("Failed to drop library")
		}
	}
}