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use crate::{error::NoDataError, prelude::*};
use anyhow::Result;
use parking_lot::Mutex;
use std::sync::Arc;
use vulkano::buffer::Subbuffer;

/// The custom model of an object made of vertices and indices.
#[derive(Clone, Debug, PartialEq)]
pub struct ModelData {
    vertex_sub_buffer: Subbuffer<[Vertex]>,
    index_sub_buffer: Subbuffer<[u32]>,
    data: Data,
}

impl ModelData {
    /// Makes a new model with given data.
    ///
    /// Can return an error in case the GPU memory is full.
    pub fn new(data: Data) -> Result<Self> {
        Self::new_from_loader(data, RESOURCES.loader())
    }

    pub(crate) fn new_from_loader(data: Data, loader: &Arc<Mutex<Loader>>) -> Result<Self> {
        if data.is_empty() {
            return Err(NoDataError.into());
        }
        let loader = loader.lock();
        let vertex_sub_buffer = loader
            .vertex_buffer_allocator
            .allocate_slice(data.vertices().len() as _)?;
        let index_sub_buffer = loader
            .index_buffer_allocator
            .allocate_slice(data.indices().len() as _)?;

        vertex_sub_buffer.write()?.copy_from_slice(data.vertices());
        index_sub_buffer.write()?.copy_from_slice(data.indices());

        Ok(Self {
            vertex_sub_buffer,
            index_sub_buffer,
            data,
        })
    }

    /// Returns the index and vertex data of this object.
    pub fn data(&self) -> &Data {
        &self.data
    }

    /// Returns the size of this model in number of indices.
    pub fn size(&self) -> usize {
        self.data.indices().len()
    }

    //TODO(Letronix624): This along with texture updates comes in the future when we optimize.
    // /// Writes data into the model influencing the model data of every instance of this model.
    // ///
    // /// Returns an error if the data given is bigger than the size of this objects vertices and indices.
    // pub fn write(&self, data: Data) -> Result<()> {
    //     if self.vertex_sub_buffer.len() < data.vertices().len() as u64
    //         || self.index_sub_buffer.len() < data.indices().len() as u64
    //     {
    //         return Err(anyhow::Error::msg("Writing into a model requires the given data size to match with the current data size. Load a new model instead."));
    //     }

    //     self.vertex_sub_buffer
    //         .write()?
    //         .copy_from_slice(data.vertices());
    //     self.index_sub_buffer
    //         .write()?
    //         .copy_from_slice(data.indices());
    //     Ok(())
    // }

    pub(crate) fn vertex_buffer(&self) -> Subbuffer<[Vertex]> {
        self.vertex_sub_buffer.clone()
    }

    pub(crate) fn index_buffer(&self) -> Subbuffer<[u32]> {
        self.index_sub_buffer.clone()
    }
}

/// The model of an appearance.
#[derive(Clone, Debug, PartialEq)]
pub enum Model {
    /// Your own model data.
    Custom(ModelData),
    /// A default model most useful for most things.
    ///
    /// A square going from -1.0 to 1.0 in both x and y.
    Square,
    /// A triangle going from -1.0 to 1.0 in both x and y.
    Triangle,
}

impl Default for Model {
    fn default() -> Self {
        Self::Square
    }
}