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mod simple;

pub use self::simple::*;

use {
    crate::{
        command::{QueueId, RenderPassEncoder},
        factory::Factory,
        graph::GraphContext,
        node::{
            render::{pass::SubpassBuilder, PrepareResult},
            BufferAccess, DescBuilder, ImageAccess, NodeBuffer, NodeImage,
        },
        BufferId, ImageId, NodeId,
    },
    gfx_hal::Backend,
};

/// Descriptor for render group
pub trait RenderGroupDesc<B: Backend, T: ?Sized>: std::fmt::Debug {
    /// Make render group builder.
    fn builder(self) -> DescBuilder<B, T, Self>
    where
        Self: Sized,
    {
        DescBuilder {
            desc: self,
            buffers: Vec::new(),
            images: Vec::new(),
            dependencies: Vec::new(),
            marker: std::marker::PhantomData,
        }
    }

    /// Get buffers used by the group. Empty by default.
    fn buffers(&self) -> Vec<BufferAccess> {
        Vec::new()
    }

    /// Get images used by the group. Empty by default.
    fn images(&self) -> Vec<ImageAccess> {
        Vec::new()
    }

    /// Number of color output images. One by default.
    fn colors(&self) -> usize {
        1
    }

    /// Is depth image used. True by default.
    fn depth(&self) -> bool {
        true
    }

    /// Build render group.
    fn build<'a>(
        self,
        ctx: &GraphContext<B>,
        factory: &mut Factory<B>,
        queue: QueueId,
        aux: &T,
        framebuffer_width: u32,
        framebuffer_height: u32,
        subpass: gfx_hal::pass::Subpass<'_, B>,
        buffers: Vec<NodeBuffer>,
        images: Vec<NodeImage>,
    ) -> Result<Box<dyn RenderGroup<B, T>>, failure::Error>;
}

/// One or more graphics pipelines to be called in subpass.
pub trait RenderGroup<B: Backend, T: ?Sized>: std::fmt::Debug + Send + Sync {
    /// Prepare resources and data for rendering.
    fn prepare(
        &mut self,
        factory: &Factory<B>,
        queue: QueueId,
        index: usize,
        subpass: gfx_hal::pass::Subpass<'_, B>,
        aux: &T,
    ) -> PrepareResult;

    /// Record commands.
    fn draw_inline(
        &mut self,
        encoder: RenderPassEncoder<'_, B>,
        index: usize,
        subpass: gfx_hal::pass::Subpass<'_, B>,
        aux: &T,
    );

    /// Free all resources and destroy group instance.
    fn dispose(self: Box<Self>, factory: &mut Factory<B>, aux: &T);
}

/// Builder fror render group.
pub trait RenderGroupBuilder<B: Backend, T: ?Sized>: std::fmt::Debug {
    /// Make subpass from render group.
    fn into_subpass(self) -> SubpassBuilder<B, T>
    where
        Self: Sized + 'static,
    {
        SubpassBuilder::new().with_group(self)
    }

    /// Number of color output images.
    fn colors(&self) -> usize;

    /// Is depth image used.
    fn depth(&self) -> bool;

    /// Get buffers used by the group
    fn buffers(&self) -> Vec<(BufferId, BufferAccess)>;

    /// Get images used by the group
    fn images(&self) -> Vec<(ImageId, ImageAccess)>;

    /// Get nodes this group depends on.
    fn dependencies(&self) -> Vec<NodeId>;

    /// Build render group instance.
    fn build<'a>(
        self: Box<Self>,
        ctx: &GraphContext<B>,
        factory: &mut Factory<B>,
        queue: QueueId,
        aux: &T,
        framebuffer_width: u32,
        framebuffer_height: u32,
        subpass: gfx_hal::pass::Subpass<'_, B>,
        buffers: Vec<NodeBuffer>,
        images: Vec<NodeImage>,
    ) -> Result<Box<dyn RenderGroup<B, T>>, failure::Error>;
}

impl<B, T, D> RenderGroupBuilder<B, T> for DescBuilder<B, T, D>
where
    B: Backend,
    T: ?Sized,
    D: RenderGroupDesc<B, T>,
{
    fn colors(&self) -> usize {
        self.desc.colors()
    }

    fn depth(&self) -> bool {
        self.desc.depth()
    }

    fn buffers(&self) -> Vec<(BufferId, BufferAccess)> {
        self.buffers
            .iter()
            .cloned()
            .zip(self.desc.buffers())
            .collect()
    }

    fn images(&self) -> Vec<(ImageId, ImageAccess)> {
        self.images
            .iter()
            .cloned()
            .zip(self.desc.images())
            .collect()
    }

    fn dependencies(&self) -> Vec<NodeId> {
        self.dependencies.clone()
    }

    fn build<'a>(
        self: Box<Self>,
        ctx: &GraphContext<B>,
        factory: &mut Factory<B>,
        queue: QueueId,
        aux: &T,
        framebuffer_width: u32,
        framebuffer_height: u32,
        subpass: gfx_hal::pass::Subpass<'_, B>,
        buffers: Vec<NodeBuffer>,
        images: Vec<NodeImage>,
    ) -> Result<Box<dyn RenderGroup<B, T>>, failure::Error> {
        self.desc.build(
            ctx,
            factory,
            queue,
            aux,
            framebuffer_width,
            framebuffer_height,
            subpass,
            buffers,
            images,
        )
    }
}