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use vulkano::image::{ImmutableImage, AttachmentImage};
use std::sync::Arc;
use vulkano::format::{Format, R8Unorm};
use vulkano::sampler::Sampler;
use vulkano::descriptor::DescriptorSet;
use vulkano::descriptor::descriptor_set::PersistentDescriptorSet;
use vulkano::buffer::{CpuAccessibleBuffer, BufferAccess};
use vulkano::pipeline::GraphicsPipelineAbstract;
use rusttype::Font;
use crate::canvas::{CanvasTextureHandle, CanvasImageHandle, CanvasFontHandle};


/// Canvas buffer which represents an allocated Texture with a key and dimensions
#[derive(Clone)]
pub struct CanvasTexture {
    pub(crate) handle: Arc<CanvasTextureHandle>,
    pub(crate) buffer: Arc<ImmutableImage<Format>>,
    pub(crate) name: String,
    pub(crate) size: (u32, u32),
}

impl CanvasTexture {
    pub fn get_descriptor_set(&self,
                              pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>,
                              sampler: Arc<Sampler>) -> Box<dyn DescriptorSet + Send + Sync> {
        let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
            PersistentDescriptorSet::start(
                pipeline.clone(), 0,
            )
                .add_sampled_image(self.buffer.clone(), sampler.clone()).unwrap()
                .build().unwrap());
        o
    }
}

/// Canvas buffer which represents an allocated image and dimension
#[derive(Clone)]
pub struct CanvasImage {
    pub(crate) handle: Arc<CanvasImageHandle>,
    pub(crate) buffer: Arc<AttachmentImage>,
    pub(crate) size: (u32, u32),
}

impl CanvasImage {
    pub fn get_descriptor_set(&self, pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>)
                              -> Box<dyn DescriptorSet + Send + Sync> {
        let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
            PersistentDescriptorSet::start(
                pipeline.clone(), 0,
            )
                .add_image(self.buffer.clone()).unwrap()
                .build().unwrap());
        o
    }
}

#[derive(Clone)]
pub struct CanvasFont {
    pub(crate) handle: Arc<CanvasFontHandle>,
    pub(crate) buffer: Arc<(dyn BufferAccess + Send + Sync)>, // Font atlas
    pub(crate) font: Font<'static>,
    pub(crate) name: String,

}

impl CanvasFont {
    pub fn get_descriptor_set(pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>)
                              -> Box<dyn DescriptorSet + Send + Sync> {
        let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
            PersistentDescriptorSet::start(
                pipeline.clone(), 0,
            )
                .build().unwrap());
        o
    }
}