/*
    wearechat - generic multiplayer game with voip
    Copyright (C) 2025 metamuffin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
#![feature(iter_array_chunks)]
pub mod mesh;
pub mod physics;

use anyhow::Result;
use clap::Parser;
use gltf::{Gltf, image::Source, import_buffers};
use humansize::BINARY;
use image::{ImageReader, codecs::webp::WebPEncoder};
use log::{debug, info};
use mesh::import_mesh;
use physics::import_physics;
use rand::random;
use rayon::iter::{ParallelBridge, ParallelIterator};
use std::{
    borrow::Cow,
    fs::File,
    io::{Cursor, Read, Write},
    marker::PhantomData,
    net::{SocketAddr, TcpStream},
    path::{Path, PathBuf},
    thread::{self, sleep},
    time::Duration,
};
use weareshared::{
    Vec3A,
    helper::ReadWrite,
    packets::{Data, Object, Packet, Resource},
    resources::{EnvironmentPart, Image, LightPart, Prefab},
    store::ResourceStore,
    vec3a,
};

#[derive(Parser)]
pub struct Args {
    address: SocketAddr,
    /// Path to a glTF file, binary or json format
    scene: PathBuf,
    /// Send all resources to the server then quit
    #[arg(short, long)]
    push: bool,
    /// Spin the object
    #[arg(long)]
    spin: bool,
    /// Remove all other object from the world
    #[arg(short, long)]
    clear: bool,
    /// Add the object to the world
    #[arg(short, long)]
    add: bool,
    /// Transcode all textures to WebP
    #[arg(short, long)]
    webp: bool,
    /// Add skybox
    #[arg(long)]
    skybox: Option<PathBuf>,
    /// Override prefab name
    #[arg(short, long)]
    name: Option<String>,
    #[arg(short, long)]
    scale: Option<f32>,
    #[arg(short, long)]
    z_up: bool,
    #[arg(short, long)]
    dry_run: bool,
}

fn main() -> Result<()> {
    env_logger::init_from_env("LOG");
    let args = Args::parse();

    let store = ResourceStore::new_memory();

    let path_base = args.scene.parent().unwrap();
    let mut gltf = Gltf::from_reader_without_validation(File::open(&args.scene)?)?;
    let blob = gltf.blob.take();
    let buffers = import_buffers(&gltf, Some(path_base), blob)?;

    let mut prefab = gltf
        .nodes()
        .par_bridge()
        .map(|node| {
            let mut prefab = Prefab::default();
            if let Some(mesh) = node.mesh() {
                import_mesh(mesh, &buffers, &store, path_base, &node, &mut prefab, &args)?;
            }
            let (position, _, _) = node.transform().decomposed();
            if let Some(light) = node.light() {
                let name = node.name().map(|e| e.to_owned());
                if let Some(name) = &name {
                    info!("adding light {name:?}");
                } else {
                    info!("adding light");
                }
                let emission = Some(Vec3A::from_array(light.color()) * light.intensity());
                if let Some(e) = emission {
                    debug!("emission is {e}");
                }
                prefab.light.push((
                    Vec3A::from_array(position),
                    store.set(&LightPart {
                        emission,
                        name,
                        radius: None,
                    })?,
                ));
            }
            import_physics(&gltf, &node, &mut prefab, &store, &buffers, &args)?;
            Ok::<_, anyhow::Error>(prefab)
        })
        .reduce(
            || Ok(Prefab::default()),
            |a, b| {
                let mut a = a?;
                let b = b?;
                a.collision.extend(b.collision);
                a.mesh.extend(b.mesh);
                a.light.extend(b.light);
                a.environment = a.environment.or(b.environment);
                a.name = a.name.or(b.name);
                Ok(a)
            },
        )?;

    prefab.name = args.name.clone().or(gltf
        .default_scene()
        .map(|n| n.name())
        .flatten()
        .map(|n| n.to_owned()));

    if let Some(skybox) = args.skybox {
        let mut buf = Vec::new();
        File::open(skybox)?.read_to_end(&mut buf)?;
        prefab.environment = Some(store.set(&EnvironmentPart {
            skybox: Some(store.set(&Image(Cow::Owned(buf)))?),
            ..Default::default()
        })?);
    }

    let pres = store.set(&prefab)?;

    let mut size = 0;
    store.iter(|d| size += d.len()).unwrap();
    info!(
        "prefab has network size of {}",
        humansize::format_size(size, BINARY)
    );

    if args.dry_run {
        return Ok(());
    }

    let mut sock = TcpStream::connect(args.address)?;
    Packet::Connect(random()).write(&mut sock)?;
    Packet::AnnouncePrefab(pres.clone()).write(&mut sock)?;
    sock.flush()?;

    let ob = if args.add {
        let ob = Object::new();
        Packet::Add(ob, pres.clone()).write(&mut sock)?;
        sock.flush()?;
        Some(ob)
    } else {
        None
    };

    if args.spin {
        let ob = ob.clone().unwrap();
        let mut sock2 = sock.try_clone().unwrap();
        thread::spawn(move || {
            let mut x = 0.;
            loop {
                Packet::Position(ob, Vec3A::ZERO, vec3a(x, x * 0.3, x * 0.1))
                    .write(&mut sock2)
                    .unwrap();
                sock2.flush().unwrap();
                x += 0.1;
                sleep(Duration::from_millis(50));
            }
        });
    }

    if args.push {
        store.iter(|d| {
            Packet::RespondResource(Data(d.to_vec()))
                .write(&mut sock)
                .unwrap();
        })?;
        sock.flush()?;
    } else {
        loop {
            let packet = Packet::read(&mut sock)?;
            match packet {
                Packet::RequestResource(hash) => {
                    if let Some(d) = store.get_raw(hash)? {
                        Packet::RespondResource(Data(d)).write(&mut sock)?;
                        sock.flush()?;
                    }
                }
                Packet::Add(ob_a, _) => {
                    if args.clear {
                        if Some(ob_a) != ob {
                            info!("removing object {ob_a}");
                            Packet::Remove(ob_a).write(&mut sock)?;
                            sock.flush()?;
                        }
                    }
                }
                _ => (),
            }
        }
    }
    Ok(())
}

fn load_texture(
    name: &str,
    store: &ResourceStore,
    path: &Path,
    buffers: &[gltf::buffer::Data],
    source: &Source,
    webp: bool,
) -> Result<Resource<Image<'static>>> {
    let mut image = match source {
        gltf::image::Source::View { view, mime_type } => {
            debug!("{name} texture is embedded and of type {mime_type:?}");
            let buf =
                &buffers[view.buffer().index()].0[view.offset()..view.offset() + view.length()];
            Image(Cow::Borrowed(buf))
        }
        gltf::image::Source::Uri {
            uri,
            mime_type: Some(mime_type),
        } => {
            debug!("{name} texture is {uri:?} and of type {mime_type:?}");
            let path = path.join(uri);
            let mut buf = Vec::new();
            File::open(path)?.read_to_end(&mut buf)?;
            Image(buf.into())
        }
        gltf::image::Source::Uri {
            uri,
            mime_type: None,
        } => {
            debug!("{name} texture is {uri:?} and has no type");
            let path = path.join(uri);
            let mut buf = Vec::new();
            File::open(path)?.read_to_end(&mut buf)?;
            Image(buf.into())
        }
    };

    if webp {
        let mut image_out = Vec::new();

        let len = image.0.len();
        ImageReader::new(Cursor::new(image.0))
            .with_guessed_format()?
            .decode()?
            .write_with_encoder(WebPEncoder::new_lossless(&mut image_out))?;
        debug!("webp encode: {len} -> {}", image_out.len());
        image = Image(Cow::Owned(image_out));
    }
    Ok(Resource(store.set(&image)?.0, PhantomData))
}