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use std::ptr::null_mut;
use {
    ffi,
    BBox,
    BitmapGlyph,
    FtResult,
    Matrix,
    RenderMode,
    Vector
};

pub struct Glyph {
    library_raw: ffi::FT_Library,
    raw: ffi::FT_Glyph
}

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

    pub fn transform(&self, mut matrix: Option<Matrix>, mut delta: Option<Vector>)
                     -> FtResult<()> {
        let mut p_matrix = null_mut();
        let mut p_delta = null_mut();

        if let Some(ref mut m) = matrix {
            p_matrix = m as *mut Matrix;
        }
        if let Some(ref mut d) = delta {
            p_delta = d as *mut Vector;
        }
        let err = unsafe {
            ffi::FT_Glyph_Transform(self.raw, p_matrix, p_delta)
        };
        if err == ffi::FT_Err_Ok {
            Ok(())
        } else {
            Err(err.into())
        }
    }

    pub fn get_cbox(&self, bbox_mode: ffi::FT_Glyph_BBox_Mode) -> BBox {
        let mut acbox = ffi::FT_BBox {
            xMin: 0,
            yMin: 0,
            xMax: 0,
            yMax: 0
        };
        unsafe {
            ffi::FT_Glyph_Get_CBox(self.raw, bbox_mode, &mut acbox)
        };
        acbox
    }

    pub fn to_bitmap(&self, render_mode: RenderMode, mut origin: Option<Vector>) -> FtResult<BitmapGlyph> {
        let mut the_glyph = self.raw;
        let mut p_origin = null_mut();

        if let Some(ref mut o) = origin {
            p_origin = o as *mut Vector;
        }
        let err = unsafe {
            ffi::FT_Glyph_To_Bitmap(&mut the_glyph, render_mode as u32, p_origin, 0)
        };
        if err == ffi::FT_Err_Ok {
            Ok(BitmapGlyph::from_raw(the_glyph as ffi::FT_BitmapGlyph))
        } else {
            Err(err.into())
        }
    }

    pub fn advance_x(&self) -> isize {
        unsafe {
            (*self.raw).advance.x as isize
        }
    }

    pub fn advance_y(&self) -> isize {
        unsafe {
            (*self.raw).advance.y as isize
        }
    }

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

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

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

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

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