use solstice::ClearSettings;
use solstice_glyph::{ab_glyph, GlyphBrushBuilder, Section, Text};
use std::error::Error;

fn main() -> Result<(), Box<dyn Error>> {
    env_logger::init();

    // Open window and create a surface
    let event_loop = glutin::event_loop::EventLoop::new();

    let window_builder = glutin::window::WindowBuilder::new().with_resizable(false);

    let context = glutin::ContextBuilder::new()
        .with_vsync(true)
        .build_windowed(window_builder, &event_loop)
        .expect("Open window");

    let context = unsafe { context.make_current().expect("Make OpenGL context current") };

    let mut size = context.window().inner_size();

    // Initialize OpenGL
    let gl = unsafe {
        solstice::glow::Context::from_loader_function(|s| context.get_proc_address(s) as *const _)
    };
    let mut gl = solstice::Context::new(gl);

    // Prepare glyph_brush
    let inconsolata = ab_glyph::FontArc::try_from_slice(include_bytes!("Inconsolata-Regular.ttf"))?;

    let mut glyph_brush = GlyphBrushBuilder::using_font(inconsolata).build(&mut gl);

    // Render loop
    context.window().request_redraw();

    event_loop.run(move |event, _, control_flow| {
        match event {
            glutin::event::Event::WindowEvent {
                event: glutin::event::WindowEvent::CloseRequested,
                ..
            } => *control_flow = glutin::event_loop::ControlFlow::Exit,
            glutin::event::Event::WindowEvent {
                event: glutin::event::WindowEvent::Resized(new_size),
                ..
            } => {
                context.resize(new_size);
                gl.set_viewport(0, 0, new_size.width as _, new_size.height as _);

                size = new_size;
            }
            glutin::event::Event::RedrawRequested { .. } => {
                let clear_color = solstice::Color {
                    red: 0.4,
                    blue: 0.4,
                    green: 0.4,
                    alpha: 1.,
                };
                solstice::Renderer::clear(
                    &mut gl,
                    ClearSettings {
                        color: Some(clear_color.into()),
                        ..Default::default()
                    },
                );

                glyph_brush.queue(Section {
                    screen_position: (30.0, 30.0),
                    bounds: (size.width as f32, size.height as f32),
                    text: vec![Text::default()
                        .with_text("Hello solstice_glyph!")
                        .with_color([0.0, 0.0, 0.0, 1.0])
                        .with_scale(40.0)],
                    ..Section::default()
                });

                glyph_brush.queue(Section {
                    screen_position: (30.0, 90.0),
                    bounds: (size.width as f32, size.height as f32),
                    text: vec![Text::default()
                        .with_text("Hello solstice_glyph!")
                        .with_color([1.0, 1.0, 1.0, 1.0])
                        .with_scale(40.0)],
                    ..Section::default()
                });

                // Draw the text!
                glyph_brush
                    .draw_queued(&mut gl, size.width, size.height)
                    .expect("Draw queued");

                context.swap_buffers().expect("Swap buffers");
            }
            _ => {
                *control_flow = glutin::event_loop::ControlFlow::Poll;
            }
        }
    })
}