use crate::error::{assume_d3d11_init, Result};
use librashader_common::{FilterMode, WrapMode};
use rustc_hash::FxHashMap;
use windows::Win32::Graphics::Direct3D11::{
    ID3D11Device, ID3D11SamplerState, D3D11_COMPARISON_NEVER, D3D11_FLOAT32_MAX,
    D3D11_SAMPLER_DESC, D3D11_TEXTURE_ADDRESS_MODE,
};
pub struct SamplerSet {
    samplers: FxHashMap<(WrapMode, FilterMode), ID3D11SamplerState>,
}

impl SamplerSet {
    pub fn get(&self, wrap: WrapMode, filter: FilterMode) -> &ID3D11SamplerState {
        self.samplers.get(&(wrap, filter)).unwrap()
    }
    pub fn new(device: &ID3D11Device) -> Result<SamplerSet> {
        let mut samplers = FxHashMap::default();
        let wrap_modes = &[
            WrapMode::ClampToBorder,
            WrapMode::ClampToEdge,
            WrapMode::Repeat,
            WrapMode::MirroredRepeat,
        ];
        for wrap_mode in wrap_modes {
            unsafe {
                let mut linear = None;
                device.CreateSamplerState(
                    &D3D11_SAMPLER_DESC {
                        Filter: FilterMode::Linear.into(),
                        AddressU: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        AddressV: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        AddressW: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        MipLODBias: 0.0,
                        MaxAnisotropy: 1,
                        ComparisonFunc: D3D11_COMPARISON_NEVER,
                        BorderColor: [0.0, 0.0, 0.0, 0.0],
                        MinLOD: -D3D11_FLOAT32_MAX,
                        MaxLOD: D3D11_FLOAT32_MAX,
                    },
                    Some(&mut linear),
                )?;

                assume_d3d11_init!(linear, "CreateSamplerState");

                let mut nearest = None;
                device.CreateSamplerState(
                    &D3D11_SAMPLER_DESC {
                        Filter: FilterMode::Nearest.into(),
                        AddressU: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        AddressV: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        AddressW: D3D11_TEXTURE_ADDRESS_MODE::from(*wrap_mode),
                        MipLODBias: 0.0,
                        MaxAnisotropy: 1,
                        ComparisonFunc: D3D11_COMPARISON_NEVER,
                        BorderColor: [0.0, 0.0, 0.0, 0.0],
                        MinLOD: -D3D11_FLOAT32_MAX,
                        MaxLOD: D3D11_FLOAT32_MAX,
                    },
                    Some(&mut nearest),
                )?;
                assume_d3d11_init!(nearest, "CreateSamplerState");

                samplers.insert((*wrap_mode, FilterMode::Linear), linear);
                samplers.insert((*wrap_mode, FilterMode::Nearest), nearest);
            }
        }

        Ok(SamplerSet { samplers })
    }
}