use anyhow::Result;
use cgmath::vec2;
use rfactor_sm_reader::*;
use vulkan_rs::prelude::*;

use std::sync::Arc;

use super::rendering::PositionOnlyVertex;

pub trait RenderObject {
    fn descriptor(&self) -> &Arc<DescriptorSet>;
    fn buffer(&self) -> &Arc<Buffer<PositionOnlyVertex>>;
}

pub struct RFactorData {
    // rf2 memory mapped data
    // telemetry_reader: TelemetryReader,
    // scoring_reader: ScoringReader,

    // radar objects
    background: RadarObject,
    player_car: RadarObject,
    cars: Vec<RadarObject>,
}

impl RFactorData {
    pub fn new(device: Arc<Device>, descriptor_layout: &Arc<DescriptorSetLayout>) -> Result<Self> {
        let radar_extent = 0.2;
        let car_height = 0.05;
        let car_width = 0.025;

        Ok(Self {
            // telemetry_reader: TelemetryReader::new()?,
            // scoring_reader: ScoringReader::new()?,
            background: RadarObject::new(
                device.clone(),
                descriptor_layout,
                PositionOnlyVertex::from_2d_corners([
                    vec2(-radar_extent, -radar_extent),
                    vec2(-radar_extent, radar_extent),
                    vec2(radar_extent, radar_extent),
                    vec2(radar_extent, -radar_extent),
                ]),
                [0.5, 0.5, 0.5, 0.5],
            )?,
            player_car: RadarObject::new(
                device.clone(),
                descriptor_layout,
                PositionOnlyVertex::from_2d_corners([
                    vec2(-car_width, -car_height),
                    vec2(-car_width, car_height),
                    vec2(car_width, car_height),
                    vec2(car_width, -car_height),
                ]),
                [0.9, 0.9, 0.0, 0.9],
            )?,
            cars: Vec::new(),
        })
    }

    pub fn update(&mut self) -> Result<()> {
        Ok(())
    }

    pub fn objects(&self) -> Vec<&dyn RenderObject> {
        let mut objects: Vec<&dyn RenderObject> = Vec::new();

        objects.push(&self.background);

        for other_player_cars in &self.cars {
            objects.push(other_player_cars);
        }

        objects.push(&self.player_car);

        objects
    }
}

struct RadarObject {
    descriptor_set: Arc<DescriptorSet>,

    // uniform buffer
    color_buffer: Arc<Buffer<f32>>,

    // vertex buffer
    position_buffer: Arc<Buffer<PositionOnlyVertex>>,
}

impl RadarObject {
    fn new(
        device: Arc<Device>,
        descriptor_layout: &Arc<DescriptorSetLayout>,
        positions: [PositionOnlyVertex; 6],
        color: [f32; 4],
    ) -> Result<Self> {
        let color_buffer = Buffer::builder()
            .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
            .set_memory_usage(MemoryUsage::CpuOnly)
            .set_data(&color)
            .build(device.clone())?;

        let position_buffer = Buffer::builder()
            .set_usage(VK_BUFFER_USAGE_VERTEX_BUFFER_BIT)
            .set_memory_usage(MemoryUsage::CpuOnly)
            .set_data(&positions)
            .build(device.clone())?;

        let descriptor_pool = DescriptorPool::builder()
            .set_layout(descriptor_layout.clone())
            .build(device.clone())?;

        let descriptor_set = descriptor_pool.prepare_set().allocate()?;
        descriptor_set.update(&[DescriptorWrite::uniform_buffers(0, &[&color_buffer])])?;

        Ok(Self {
            descriptor_set,
            color_buffer,
            position_buffer,
        })
    }

    pub fn update_color(&self, color: [f32; 4]) -> Result<()> {
        self.color_buffer.fill(&color)
    }
}

impl RenderObject for RadarObject {
    fn descriptor(&self) -> &Arc<DescriptorSet> {
        &self.descriptor_set
    }

    fn buffer(&self) -> &Arc<Buffer<PositionOnlyVertex>> {
        &self.position_buffer
    }
}