use std::env;

use getopts::Options;

use std::io::prelude::*;

use std::io::{self, Read};

use std::net::{Shutdown, TcpStream};

use image::{GrayImage, imageops};

    generate_preview: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, preview: &mut PreviewInfo)>,

    dispose_preview: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, preview: &mut PreviewInfo)>,

    send_ipc: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, buf: *const u8, size: usize)>,

    read_ipc: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, buf: *mut u8, size: usize) -> usize>,

}

#[repr(C)]

#[derive(Copy, Clone)]

struct PreviewInfo {

  width: u32,

  height: u32,

  hedgehogs_number: u8,

  land: *const u8,

            generate_preview: hwlib.get(b"generate_preview").unwrap(),

            dispose_preview: hwlib.get(b"dispose_preview").unwrap(),

            send_ipc: hwlib.get(b"send_ipc").unwrap(),

            read_ipc: hwlib.get(b"read_ipc").unwrap(),

        let args: Vec<String> = env::args().collect();

        let mut opts = getopts::Options::new();

        opts.optflag("", "internal", "[internal]");

        opts.optflag("", "landpreview", "[internal]");

        opts.optflag("", "recorder", "[internal]");

        opts.optopt("", "port", "[internal]", "PORT");

        opts.optopt("", "user-prefix", "Set the path to the custom data folder to find game content", "PATH_TO_FOLDER");

        opts.optopt("", "prefix", "Set the path to the system game data folder", "PATH_TO_FOLDER");

        let matches = match opts.parse(&args[1..]) {

            Ok(m) => { m }

            Err(f) => { panic!(f.to_string()) }

        };

        let engine_state = &mut *engine.start_engine.deref()();

        let port: String = matches.opt_str("port").unwrap();

        println!("PORT: {}", port);

        if matches.opt_present("landpreview") {

            let mut stream = TcpStream::connect(format!("127.0.0.1:{}", port)).expect("Failed to connect to IPC port. Feelsbadman.");

            //stream.write(b"\x01C").unwrap(); // config

            //stream.write(b"\x01?").unwrap(); // ping

            let mut buf = [0;1];

            loop {

                let bytes_read = stream.read(&mut buf).unwrap();

                if bytes_read == 0 {

                    break;

                }

                engine.send_ipc.deref()(engine_state, &buf[0], buf.len());

                // this looks like length 1 is being announced

                if buf[0] == 1 {

                    let bytes_read = stream.read(&mut buf).unwrap();

                    if bytes_read == 0 {

                        break;

                    }

                    if buf[0] == 33 {

                        println!("Ping? Pong!");

                        break;

                    }

                }

            };

            let preview_info = &mut PreviewInfo {

                width: 0,

                height: 0,

                hedgehogs_number: 0,

                land: std::ptr::null(),

            };

            engine.generate_preview.deref()(engine_state, preview_info);

            println!("Sending preview...");

            //println!("Preview: w = {}, h = {}, n = {}", preview_info.width, preview_info.height, preview_info.hedgehogs_number);

            let land_size: usize = (preview_info.width * preview_info.height) as usize;

            let land_array: &[u8] = std::slice::from_raw_parts(preview_info.land, land_size);

            let raw_image = GrayImage::from_raw(preview_info.width, preview_info.height, land_array.to_vec()).unwrap();

            const PREVIEW_WIDTH: u32 = 256;

            const PREVIEW_HEIGHT: u32 = 128;

            let preview_image = imageops::resize(&raw_image, PREVIEW_WIDTH, PREVIEW_HEIGHT, imageops::FilterType::Triangle);

            stream.write(preview_image.as_raw()).unwrap();

            stream.flush().unwrap();

            stream.write(&[preview_info.hedgehogs_number]).unwrap();

            stream.flush().unwrap();

            println!("Preview sent, disconnect");

            stream.shutdown(Shutdown::Both).expect("IPC shutdown call failed");

            engine.dispose_preview.deref()(engine_state, preview_info);

        }

        engine.cleanup.deref()(engine_state);