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use std::ffi::{ CString, OsStr };
use std::ptr::null_mut;
use libc::{ self, c_void, c_long, size_t };
use { Face, FtResult, Error };
use ffi;

extern "C" fn alloc_library(_memory: ffi::FT_Memory, size: c_long) -> *mut c_void {
    unsafe {
        libc::malloc(size as size_t)
    }
}

extern "C" fn free_library(_memory: ffi::FT_Memory, block: *mut c_void) {
    unsafe {
        libc::free(block)
    }
}

extern "C" fn realloc_library(_memory: ffi::FT_Memory,
                              _cur_size: c_long,
                              new_size: c_long,
                              block: *mut c_void) -> *mut c_void {
    unsafe {
        libc::realloc(block, new_size as size_t)
    }
}

static mut MEMORY: ffi::FT_MemoryRec = ffi::FT_MemoryRec {
    user: 0 as *mut c_void,
    alloc: alloc_library,
    free: free_library,
    realloc: realloc_library
};

pub struct Library {
    raw: ffi::FT_Library
}

impl Library {
    /// This function is used to create a new FreeType library instance and add the default
    /// modules. It returns a struct encapsulating the freetype library. The library is correctly
    /// discarded when the struct is dropped.
    pub fn init() -> FtResult<Self> {
        let mut raw = null_mut();

        let err = unsafe {
            ffi::FT_New_Library(&mut MEMORY, &mut raw)
        };
        if err == ffi::FT_Err_Ok {
            unsafe {
                ffi::FT_Add_Default_Modules(raw);
            }
            Ok(Library {
                raw: raw
            })
        } else {
            Err(err.into())
        }
    }

    /// Open a font file using its pathname. `face_index` should be 0 if there is only 1 font
    /// in the file.
    pub fn new_face<P>(&self, path: P, face_index: isize) -> FtResult<Face<'static>>
        where P: AsRef<OsStr>
    {
        let mut face = null_mut();

        let path = try!(path.as_ref()
                            .to_str()
                            .and_then(|s| CString::new(s).ok())
                            .ok_or(Error::InvalidPath));
        let err = unsafe {
            ffi::FT_New_Face(self.raw, path.as_ptr() as *const _, face_index as ffi::FT_Long, &mut face)
        };
        if err == ffi::FT_Err_Ok {
            Ok(unsafe { Face::from_raw(self.raw, face) })
        } else {
            Err(err.into())
        }
    }

    /// Similar to `new_face`, but loads file data from a byte array in memory
    pub fn new_memory_face<'a>(&self, buffer: &'a [u8], face_index: isize) -> FtResult<Face<'a>> {
        let mut face = null_mut();

        let err = unsafe {
            ffi::FT_New_Memory_Face(self.raw, buffer.as_ptr(), buffer.len() as ffi::FT_Long,
                                    face_index as ffi::FT_Long, &mut face)
        };
        if err == ffi::FT_Err_Ok {
            Ok(unsafe { Face::from_raw(self.raw, face) })
        } else {
            Err(err.into())
        }
    }

    /// Get the underlying library object
    pub fn raw(&self) -> ffi::FT_Library {
        self.raw
    }
}

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