use serde::{de::DeserializeOwned, Deserialize, Serialize};
use std::{io, path::Path};

#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum Key {
    Backspace,
    Left,
    Right,
    Up,
    Down,
    Home,
    End,
    PageUp,
    PageDown,
    BackTab,
    Delete,
    Insert,
    F(u8),
    Char(char),
    Alt(char),
    Ctrl(char),
    Null,
    Esc,
}

// TODO: use same struct from main crate?
#[derive(Default, Debug, Clone, Serialize, Deserialize)]
pub struct Help {
    pub mode: InputMode,
    pub mode_is_persistent: bool,
    pub keybinds: Vec<(String, String)>,
}

// TODO: use same struct from main crate?
#[derive(Debug, Clone, Deserialize, Serialize)]
pub enum InputMode {
    Normal,
    Command,
    CommandPersistent,
    Resize,
    Pane,
    Tab,
    Scroll,
    Exiting,
}

impl Default for InputMode {
    fn default() -> InputMode {
        InputMode::Normal
    }
}

pub fn get_key() -> Key {
    deserialize_from_stdin().unwrap()
}

pub fn open_file(path: &Path) {
    println!("{}", path.to_string_lossy());
    unsafe { host_open_file() };
}

pub fn set_max_height(max_height: i32) {
    unsafe { host_set_max_height(max_height) };
}

pub fn set_invisible_borders(invisible_borders: bool) {
    let invisible_borders = if invisible_borders { 1 } else { 0 };
    unsafe { host_set_invisible_borders(invisible_borders) };
}

pub fn set_selectable(selectable: bool) {
    let selectable = if selectable { 1 } else { 0 };
    unsafe { host_set_selectable(selectable) };
}

pub fn get_help() -> Help {
    unsafe { host_get_help() };
    deserialize_from_stdin().unwrap_or_default()
}

fn deserialize_from_stdin<T: DeserializeOwned>() -> Option<T> {
    let mut json = String::new();
    io::stdin().read_line(&mut json).unwrap();
    serde_json::from_str(&json).ok()
}

#[link(wasm_import_module = "zellij")]
extern "C" {
    fn host_open_file();
    fn host_set_max_height(max_height: i32);
    fn host_set_selectable(selectable: i32);
    fn host_set_invisible_borders(invisible_borders: i32);
    fn host_get_help();
}