use std::path::Path;
use image::GenericImageView;

pub struct Texture {
    pub texture: wgpu::Texture,
    pub view: wgpu::TextureView,
    pub sampler: wgpu::Sampler,
}

impl Texture {

    pub fn from_file(device: &wgpu::Device, queue: &wgpu::Queue, str_path: &str) -> Self {
        let img_path = Path::new(str_path);
        let img = image::open(img_path).unwrap();
        Self::from_image(&device, &queue, &img)
    }

    pub fn from_image(device: &wgpu::Device, queue: &wgpu::Queue, img: &image::DynamicImage) -> Self {
        // Data from image
        let img_dim = img.dimensions();
        let img_data = img.as_rgba8().unwrap();
        
        // Create texture on device
        let texture_size = wgpu::Extent3d { width: img_dim.0, height: img_dim.1, depth: 1, };
        let texture = device.create_texture(&wgpu::TextureDescriptor {
            size: texture_size,
            mip_level_count: 1,
            sample_count: 1,
            dimension: wgpu::TextureDimension::D2,
            format: wgpu::TextureFormat::Rgba8UnormSrgb,
            usage: wgpu::TextureUsage::SAMPLED | wgpu::TextureUsage::COPY_DST,
            label: None,
        });

        // Write texture to memory
        queue.write_texture(
            wgpu::TextureCopyView { texture: &texture, mip_level: 0, origin: wgpu::Origin3d::ZERO },
            img_data,
            wgpu::TextureDataLayout { offset: 0, bytes_per_row: 4 * img_dim.0, rows_per_image: img_dim.1 },
            texture_size,
        );

        // Create view and sampler
        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
        let sampler = device.create_sampler(
            &wgpu::SamplerDescriptor {
                address_mode_u: wgpu::AddressMode::ClampToEdge,
                address_mode_v: wgpu::AddressMode::ClampToEdge,
                address_mode_w: wgpu::AddressMode::ClampToEdge,
                //mag_filter: wgpu::FilterMode::Linear,
                mag_filter: wgpu::FilterMode::Nearest,
                min_filter: wgpu::FilterMode::Nearest,
                mipmap_filter: wgpu::FilterMode::Nearest,
                ..Default::default()
            }
        );

        Self { texture, view, sampler }
    }

}