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use glyph_brush::rusttype::Font;
use serde::{Deserialize, Serialize};

use amethyst_assets::{Asset, Format, Handle, ProcessableAsset, ProcessingState};
use amethyst_core::ecs::prelude::VecStorage;
use amethyst_error::{format_err, Error, ResultExt};

/// A loaded set of fonts from a file.
#[derive(Clone)]
#[allow(missing_debug_implementations)]
pub struct FontAsset(pub Font<'static>);

/// A handle to font data stored with `amethyst_assets`.
pub type FontHandle = Handle<FontAsset>;

#[derive(Clone)]
#[allow(missing_debug_implementations)]
pub struct FontData(Font<'static>);

amethyst_assets::register_format_type!(FontData);

impl Asset for FontAsset {
    const NAME: &'static str = "ui::Font";
    type Data = FontData;
    type HandleStorage = VecStorage<Handle<Self>>;
}

impl ProcessableAsset for FontAsset {
    fn process(data: FontData) -> Result<ProcessingState<FontAsset>, Error> {
        Ok(ProcessingState::Loaded(FontAsset(data.0)))
    }
}

/// Loads font files, supports TrueType and **some** OpenType files.
///
/// OpenType is a superset of TrueType, so if your OpenType file uses any features that don't
/// exist in TrueType this will fail.  This will only load the first font contained in a file.
/// If this is a problem for you please file an issue with Amethyst on GitHub.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct TtfFormat;

amethyst_assets::register_format!("TTF", TtfFormat as FontData);
impl Format<FontData> for TtfFormat {
    fn name(&self) -> &'static str {
        "TTF"
    }

    fn import_simple(&self, bytes: Vec<u8>) -> Result<FontData, Error> {
        Font::from_bytes(bytes)
            .map(FontData)
            .with_context(|_| format_err!("Font parsing error"))
    }
}