use crate::Globals;
use util::ResultExt;

use wayland_client::protocol::wl_pointer::WlPointer;
use wayland_client::protocol::wl_surface::WlSurface;
use wayland_client::Connection;
use wayland_cursor::{CursorImageBuffer, CursorTheme};

pub(crate) struct Cursor {
    theme: Option<CursorTheme>,
    surface: WlSurface,
}

impl Drop for Cursor {
    fn drop(&mut self) {
        self.theme.take();
        self.surface.destroy();
    }
}

impl Cursor {
    pub fn new(connection: &Connection, globals: &Globals, size: u32) -> Self {
        Self {
            theme: CursorTheme::load(&connection, globals.shm.clone(), size).log_err(),
            surface: globals.compositor.create_surface(&globals.qh, ()),
        }
    }

    pub fn set_icon(&mut self, wl_pointer: &WlPointer, serial_id: u32, mut cursor_icon_name: &str) {
        if let Some(theme) = &mut self.theme {
            let mut buffer: Option<&CursorImageBuffer>;

            if let Some(cursor) = theme.get_cursor(&cursor_icon_name) {
                buffer = Some(&cursor[0]);
            } else if let Some(cursor) = theme.get_cursor("default") {
                buffer = Some(&cursor[0]);
                cursor_icon_name = "default";
                log::warn!(
                    "Linux: Wayland: Unable to get cursor icon: {}. Using default cursor icon",
                    cursor_icon_name
                );
            } else {
                buffer = None;
                log::warn!("Linux: Wayland: Unable to get default cursor too!");
            }

            if let Some(buffer) = &mut buffer {
                let (width, height) = buffer.dimensions();
                let (hot_x, hot_y) = buffer.hotspot();

                wl_pointer.set_cursor(serial_id, Some(&self.surface), hot_x as i32, hot_y as i32);
                self.surface.attach(Some(&buffer), 0, 0);
                self.surface.damage(0, 0, width as i32, height as i32);
                self.surface.commit();
            }
        } else {
            log::warn!("Linux: Wayland: Unable to load cursor themes");
        }
    }
}