use hbb_common::{bail, ResultType};
use std::sync::{Arc, Mutex};

const LIB_NAME_VIRTUAL_DISPLAY: &str = "dylib_virtual_display";

lazy_static::lazy_static! {
    static ref LIB_VIRTUAL_DISPLAY: Arc<Mutex<Result<libloading::Library, libloading::Error>>> = {
        Arc::new(Mutex::new(unsafe { libloading::Library::new(get_lib_name()) }))
    };
}

#[cfg(target_os = "windows")]
fn get_lib_name() -> String {
    format!("{}.dll", LIB_NAME_VIRTUAL_DISPLAY)
}

#[cfg(target_os = "linux")]
fn get_lib_name() -> String {
    format!("lib{}.so", LIB_NAME_VIRTUAL_DISPLAY)
}

#[cfg(target_os = "macos")]
fn get_lib_name() -> String {
    format!("lib{}.dylib", LIB_NAME_VIRTUAL_DISPLAY)
}

fn try_reload_lib() {
    let mut lock = LIB_VIRTUAL_DISPLAY.lock().unwrap();
    if lock.is_err() {
        *lock = unsafe { libloading::Library::new(get_lib_name()) };
    }
}

#[cfg(windows)]
pub fn get_dirver_install_path() -> ResultType<&'static str> {
    try_reload_lib();
    match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
        Ok(lib) => unsafe {
            match lib.get::<libloading::Symbol<fn() -> &'static str>>(b"get_dirver_install_path") {
                Ok(func) => Ok(func()),
                Err(e) => bail!("Failed to load func get_dirver_install_path, {}", e),
            }
        },
        Err(e) => bail!("Failed to load library {}, {}", LIB_NAME_VIRTUAL_DISPLAY, e),
    }
}

pub fn is_device_created() -> bool {
    try_reload_lib();
    match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
        Ok(lib) => unsafe {
            match lib.get::<libloading::Symbol<fn() -> bool>>(b"is_device_created") {
                Ok(func) => func(),
                Err(..) => false,
            }
        },
        Err(..) => false,
    }
}

pub fn close_device() {
    try_reload_lib();
    match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
        Ok(lib) => unsafe {
            match lib.get::<libloading::Symbol<fn()>>(b"close_device") {
                Ok(func) => func(),
                Err(..) => {}
            }
        },
        Err(..) => {}
    }
}

macro_rules! def_func_result {
    ($func:ident, $name: tt) => {
        pub fn $func() -> ResultType<()> {
            try_reload_lib();
            match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
                Ok(lib) => unsafe {
                    match lib.get::<libloading::Symbol<fn() -> ResultType<()>>>($name.as_bytes()) {
                        Ok(func) => func(),
                        Err(e) => bail!("Failed to load func {}, {}", $name, e),
                    }
                },
                Err(e) => bail!("Failed to load library {}, {}", LIB_NAME_VIRTUAL_DISPLAY, e),
            }
        }
    };
}

pub fn install_update_driver(reboot_required: &mut bool) -> ResultType<()> {
    try_reload_lib();
    match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
        Ok(lib) => unsafe {
            match lib.get::<libloading::Symbol<fn(&mut bool) -> ResultType<()>>>(
                b"install_update_driver",
            ) {
                Ok(func) => func(reboot_required),
                Err(e) => bail!("Failed to load func install_update_driver, {}", e),
            }
        },
        Err(e) => bail!("Failed to load library {}, {}", LIB_NAME_VIRTUAL_DISPLAY, e),
    }
}

pub fn uninstall_driver(reboot_required: &mut bool) -> ResultType<()> {
    try_reload_lib();
    match &*LIB_VIRTUAL_DISPLAY.lock().unwrap() {
        Ok(lib) => unsafe {
            match lib
                .get::<libloading::Symbol<fn(&mut bool) -> ResultType<()>>>(b"uninstall_driver")
            {
                Ok(func) => func(reboot_required),
                Err(e) => bail!("Failed to load func uninstall_driver, {}", e),
            }
        },
        Err(e) => bail!("Failed to load library {}, {}", LIB_NAME_VIRTUAL_DISPLAY, e),
    }
}

def_func_result!(download_driver, "download_driver");
def_func_result!(create_device, "create_device");
def_func_result!(plug_in_monitor, "plug_in_monitor");
def_func_result!(plug_out_monitor, "plug_out_monitor");
def_func_result!(update_monitor_modes, "update_monitor_modes");