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use std::{path::Path, io::{self, Read}, fs::File, ops::Deref};
use super::packedfile;
use crate::utils::{LibraryId, ObjectId};
use hashbrown::HashMap;

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone,Debug,Copy)]
#[repr(i32)]
pub enum Color{
    NonColor = 0,
    Color = 1,
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone,Debug,Copy)]
#[repr(i32)]
pub enum Wrap{
    Repeat = 0,
    Extend = 1,
    Clip = 2,
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone,Debug,Copy)]
#[repr(i32)]
pub enum Projection{
    Flat = 0,
    BoxP = 1,
    Sphere = 2,
    Tube = 3,
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone,Debug,Copy)]
#[repr(i32)]
pub enum Interpolation{
    Linear = 0,
    Closest = 1,
    Cubic = 2,
    Smart = 3,
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone,Debug,Copy)]
pub enum Modifier{
    Hue(f32),
    Saturation(f32),
    Value(f32),
    Hsv(f32,f32,f32),
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone)]
pub struct Image{
    pub data: ObjectId,
    pub wrap: Wrap,
    pub color_space: Color,
    pub interpolation: Interpolation,
    pub projection: Projection,
    pub modifiers: Vec<(Modifier, f32)>,
}

#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
#[derive(Clone)]
pub struct Data{
    pub data: Vec<u8>,
}

impl Deref for Data{
    type Target = [u8];
    fn deref(&self) -> &[u8]{
        &self.data
    }
}

pub struct Texture<'a>{
    pub data: &'a Data,
    pub image: &'a Image
}


pub fn parse_img_data<P:AsRef<Path>>(img: &blender::Object, container_path: Option<P>) -> Result<Data, io::Error>{
    match img.get_object("packedfile"){
        Ok(packedfile) => {
            let img_data = packedfile::data(&packedfile)
                .map_err(|err| io::Error::new(io::ErrorKind::InvalidData, err))?;
            Ok(Data{
                data: img_data.to_vec(),
            })
        }
        Err(_) =>{
            if let Some(container_path) = container_path {
                let mut path = img.get_str("name").unwrap().to_owned();
                if path.starts_with("//"){
                    path = container_path.as_ref().join(&path[2..]).to_str().unwrap().to_owned();
                }
                let mut file = File::open(path)?;
                let mut data = Vec::new();
                file.read_to_end(&mut data)?;
                Ok(Data{
                    data,
                })
            }else{
                let msg = "Can't load non packed textures with file loaded from memory";
                let error = blender::Error::from(msg.to_string());
                Err(io::Error::new(io::ErrorKind::NotFound, error))
            }
        }
    }
}


pub fn parse_img_node(
    img: &blender::Object,
    library_id: LibraryId,
    node: Option<blender::Object>,
    libraries: &HashMap<LibraryId, blender::File>,
    images_data: &mut HashMap<ObjectId, Data>) -> Result<Image, io::Error>
{
    let wrap = node.as_ref()
        .and_then(|n| *n.get("extension").unwrap())
        .unwrap_or(Wrap::Repeat);
    let color_space = node.as_ref()
        .and_then(|n| *n.get("color_space").unwrap())
        .unwrap_or(Color::Color);
    let projection = node.as_ref()
        .and_then(|n| *n.get("projection").unwrap())
        .unwrap_or(Projection::Flat);
    let interpolation = node.as_ref()
        .and_then(|n| *n.get("interpolation").unwrap())
        .unwrap_or(Interpolation::Linear);
    let data = library_id.object_id(img);
    if !images_data.contains_key(&data){
        let library = &libraries[&data.source_file];
        let container_dir = library.file_path().and_then(|p| p.parent());
        let img_data = parse_img_data(&img, container_dir)?;
        images_data.insert(data.clone(), img_data);
    }

    Ok(Image{
        data,
        wrap,
        color_space,
        projection,
        interpolation,
        modifiers: vec![],
    })
}

pub fn parse_images(
    blend: &blender::File,
    library_id: &LibraryId,
    libraries: &HashMap<LibraryId, blender::File>) -> HashMap<ObjectId, Data>
{
    let container_dir = blend.file_path().and_then(|p| p.parent());
    blend.objects("Image")
        .filter_map(|img| {
            if let Some(lib_id) = library_id.linked_library_id(&img) {
                let library = &libraries[&lib_id];
                let img = library.object_by_name(img.name().unwrap())?;
                let img_data = parse_img_data(&img, container_dir).ok();
                let id = ObjectId::new(lib_id, img.name().unwrap());
                img_data.map(|img_data| (id, img_data))
            }else{
                let img_data = parse_img_data(&img, container_dir).ok();
                let id = ObjectId::new(library_id.clone(), img.name().unwrap());
                img_data.map(|img_data| (id, img_data))
            }
        }).collect()
}