extern crate "libnotify-sys" as sys;
extern crate "glib-2_0-sys" as glib;

use std::ffi::CString;
use std::marker::PhantomData;

use glib::types::{
    TRUE,
    FALSE
};

/// Error that can happen on context creation
#[derive(Debug)]
pub enum ContextCreationError {
    /// Context already exists
    AlreadyExists,
    InitFailure,
    NulError
}

#[derive(Debug)]
pub enum NotificationCreationError {
    NulError,
    Unknown
}

/// The context which within libnotify operates
pub struct Context;

impl Context {
    /// Create a new context
    ///
    /// Arguments:
    ///
    /// - app_name: The name of the application using the context
    pub fn new(app_name: &str) -> Result<Context, ContextCreationError> {
        unsafe {
            if sys::notify_is_initted() == TRUE {
                return Err(ContextCreationError::AlreadyExists);
            }
            let app_name = match CString::new(app_name) {
                Ok(name) => name,
                Err(_) => return Err(ContextCreationError::NulError)
            };
            if sys::notify_init(app_name.as_ptr()) == FALSE {
                return Err(ContextCreationError::InitFailure);
            }
        }
        Ok(Context)
    }
    /// Creates a new Notification.
    ///
    /// Arguments:
    ///
    /// - summary: Required summary text
    /// - body: Optional body text
    /// - icon: Optional icon theme icon name or filename
    pub fn new_notification(&self, summary: &str,
                                   body: Option<&str>,
                                   icon: Option<&str>)
        -> Result<Notification, NotificationCreationError> {
        let summary = match CString::new(summary) {
            Ok(cstr) => cstr,
            Err(_) => return Err(NotificationCreationError::NulError)
        };
        let body = match body {
            Some(body) => match CString::new(body) {
                Ok(cstr) => Some(cstr),
                Err(_) => return Err(NotificationCreationError::NulError)
            },
            None => None
        };
        let body_ptr = match body {
            Some(body) => body.as_ptr(),
            None => std::ptr::null()
        };
        let icon = match icon {
            Some(icon) => match CString::new(icon) {
                Ok(cstr) => Some(cstr),
                Err(_) => return Err(NotificationCreationError::NulError)
            },
            None => None
        };
        let icon_ptr = match icon {
            Some(icon) => icon.as_ptr(),
            None => std::ptr::null()
        };
        unsafe {
            let n = sys::notify_notification_new(summary.as_ptr(),
                                                 body_ptr,
                                                 icon_ptr);
            if n.is_null() {
                return Err(NotificationCreationError::Unknown);
            }

            Ok(Notification{handle: n, _phantom: PhantomData})
        }
    }
}

impl Drop for Context {
    fn drop(&mut self) {
        unsafe {
            sys::notify_uninit();
        }
    }
}

/// A passive pop-up notification
pub struct Notification<'a> {
    handle: *mut sys::NotifyNotification,
    _phantom: PhantomData<&'a Context>
}

impl<'a> Notification<'a> {
    /// Tells the notification server to display the notification
    /// on the screen.
    pub fn show(&'a self) -> Result<(), ()> {
        unsafe {
            let mut err: *mut glib::GError = std::ptr::null_mut();
            sys::notify_notification_show(self.handle, &mut err);
            if !err.is_null() {
                glib::g_error_free(err);
                return Err(())
            }
            return Ok(())
        }
    }
}