use crate::filesystem::FILE_SYSTEM;
use crate::info::master;
use crate::time::fetch_time;
use crate::wasm_jumploader::interp;
use crate::ALLOCATOR;
use crate::{
    arch::{shutdown, sloop},
    systeminfo::{KERNEL_VERSION, RELEASE_TYPE},
    KERNEL_STATE,
};
use genfs::{Fs, OpenOptions};
use rhai::Engine;
use spin::Lazy;
use x86_64::instructions::interrupts::{disable, enable};

pub static KEYBUFF: spin::Mutex<Vec<char>> = spin::Mutex::new(Vec::new());
pub static CURRENT_DIR: Lazy<spin::Mutex<String>> = Lazy::new(|| spin::Mutex::new("/".to_string()));

#[cfg(target_arch = "riscv64")]
pub fn shell() {}

#[cfg(target_arch = "x86_64")]
pub fn shell() {
    let _current_dir = "/".to_string();
    let engine = engine_construction();
    let mut scope = rhai::Scope::new();

    let mut buf = String::new();
    print!("> ");

    loop {
        match x86_64::instructions::interrupts::without_interrupts(|| KEYBUFF.lock().pop()) {
            Some('\n') => {
                match engine.eval_with_scope::<rhai::Dynamic>(&mut scope, &buf) {
                    Ok(o) => println!("{o}"),

                    Err(e) => println!("Eval error: {e}"),
                };

                buf.clear();
                print!("> ");
            }
            Some('\u{0008}') => {
                buf.pop();
            }

            Some('\u{0009}') => {
                buf.push(' ');
                buf.push(' ');
                buf.push(' ');
                buf.push(' ');
            }

            Some(chr) => buf.push(chr),
            None => (),
        }
    }
}

pub fn afetch() {
    let kstate = KERNEL_STATE.lock();

    let tick_time = fetch_time();

    disable();
    let allocator = ALLOCATOR.lock();
    let size = allocator.size();
    let used = allocator.used();
    enable();

    // let mem = format!("{}/{}", used, size);
    println!(
        include_str!("balloon.txt"),
        kstate.hostname,
        RELEASE_TYPE,
        KERNEL_VERSION,
        tick_time,
        master().unwrap().brand_string().unwrap(),
        // mem
        used,
        size
    );
    drop(kstate);
}

pub fn set_hostname(name: String) {
    let mut kstate = KERNEL_STATE.lock();
    kstate.hostname = name;
}

/// Examine a memory pointer
pub fn peek_memory(ptr: i64) -> i64 {
    println!(">:(");
    unsafe { *(ptr as *const u8) as _ }
}

pub fn poke_memory(ptr: i64, val: i64) {
    match val.try_into() {
        Ok(val) => unsafe { *(ptr as *mut u8) = val },
        Err(_) => println!("Error: {val} cannot be converted into u8"),
    }
}

pub fn ls() {
    let current_dir = CURRENT_DIR.lock();

    let fs = &*FILE_SYSTEM.lock();

    let file = fs
        .open(current_dir.as_bytes(), OpenOptions::new().read(true))
        .unwrap();

    let mut files = file.directory().unwrap();
    println!("current dir: {}", *current_dir);
    while let Some(Ok(entry)) = files.next() {
        let inode_name = entry.name;
        let s = String::from_utf8_lossy(&inode_name);
        println!("{}", s);
    }
}

pub fn log_dump() {
    use crate::network::socket::SimpleSock;
    use crate::relib::network::socket::Socket;
    let log_socket_id = SimpleSock::grab_socket("Logger".to_string());
    match log_socket_id {
        Some(mut log_socket_id) => {
            let log = log_socket_id.peek();

            match log {
                crate::network::socket::SocketReturns::ReadOk(ok) => {
                    for x in ok.iter() {
                        print!("{}", *x as char);
                    }
                }

                crate::network::socket::SocketReturns::ReadIndexOutOfBounds => todo!(),
                crate::network::socket::SocketReturns::WriteOk => todo!(),
            }
        }
        None => warn!("No socket found for Logger"),
    }
}

pub fn echo_file(path: String) {
    let mut current_dir = CURRENT_DIR.lock();

    let fs = &*FILE_SYSTEM.lock();

    current_dir.push_str(&path);

    let file = fs
        .open(current_dir.as_bytes(), OpenOptions::new().read(true))
        .unwrap();

    if file.is_dir() {
        println!("{} is a directory", path);
    } else {
        let mut file_contents = Vec::new();

        let _ret = file.read_to_end(&mut file_contents).unwrap();

        let file_contents_str = String::from_utf8_lossy(&file_contents);

        println!("{}", file_contents_str);
    }
}

pub fn change_directory(path: String) {
    let mut current_dir = CURRENT_DIR.lock();

    let _fs = &*FILE_SYSTEM.lock();
    if path == "." || path == ".." {
        let mut split_dir = current_dir.split('/').collect::<Vec<&str>>();
        let mut new_dir = String::new();
        split_dir.remove(split_dir.len() - 1);
        println!("{:?}", split_dir);
        if split_dir.is_empty() {
            new_dir = "/".to_string();
        } else {
            for x in split_dir {
                new_dir.push_str(x);
                new_dir.push('/');
            }
        }
        *current_dir = new_dir;
    } else {
        if !current_dir.ends_with('/') {
            current_dir.push('/');
        }
        current_dir.push_str(&path);
    }
}

fn engine_construction() -> Engine {
    let mut engine = rhai::Engine::new();

    engine.on_print(|x| println!("{}", x));
    engine.on_debug(|x, src, pos| {
        let src = src.unwrap_or("unknown");
        println!("DEBUG: {} at {:?}: {}", src, pos, x);
        debug!("{} at {:?}: {}", src, pos, x);
    });

    engine.register_fn("ls", ls);
    engine.register_fn("cat", echo_file);
    engine.register_fn("cd", change_directory);
    engine.register_fn("afetch", afetch);
    engine.register_fn("set_hostname", set_hostname);
    engine.register_fn("shutdown", shutdown);
    engine.register_fn("peek", peek_memory);
    engine.register_fn("poke", poke_memory);
    engine.register_fn("sloop", sloop);
    engine.register_fn("wasm", interp);
    engine.register_fn("log_dump", log_dump);

    engine
}