use xcb::{
    x::{
        ChangeProperty, ChangeWindowAttributes, ConfigWindow, ConfigureNotifyEvent,
        ConfigureWindow, Cw, EventMask, MapWindow, SendEvent, SendEventDest, Window,
    },
    VoidCookie, VoidCookieChecked, Xid,
};

use crate::{config::BORDER_WIDTH, conn_info::Connection};

use super::hints;

/// Information about a single client / window
#[derive(Debug)]
pub struct Client {
    /// The corresponding X11 window
    window: Window,

    x: i16,
    y: i16,
    width: u16,
    height: u16,
    border_width: u16,
    mapped: bool,

    urgent: bool,
    never_focus: bool,
}

impl Client {
    pub const fn new(window: Window) -> Self {
        Self {
            window,
            x: 0,
            y: 0,
            width: 0,
            height: 0,
            border_width: BORDER_WIDTH,
            mapped: false,
            urgent: false,
            never_focus: false,
        }
    }

    /// Send a configure configure notify event with the current geometry.
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn configure_notify(&self, conn: &Connection<'_>) {
        conn.send_request(&SendEvent {
            destination: SendEventDest::Window(self.window),
            event_mask: EventMask::STRUCTURE_NOTIFY,
            event: &ConfigureNotifyEvent::new(
                self.window,
                self.window,
                Window::none(),
                self.x,
                self.y,
                self.width,
                self.height,
                self.border_width,
                false,
            ),
            propagate: false,
        });
    }

    /// Set this client's geometry, also updating the X11 window if needed.
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn set_geom(
        &mut self,
        conn: &Connection<'_>,
        x: i16,
        y: i16,
        width: u16,
        height: u16,
        border_width: u16,
    ) {
        if (x, y, width, height, border_width)
            == (self.x, self.y, self.width, self.height, self.border_width)
        {
            return;
        }

        self.x = x;
        self.y = y;
        self.width = width;
        self.height = height;
        self.border_width = border_width;

        conn.send_request(&ConfigureWindow {
            window: self.window,
            value_list: &[
                ConfigWindow::X(self.x.into()),
                ConfigWindow::Y(self.y.into()),
                ConfigWindow::Width(self.width.into()),
                ConfigWindow::Height(self.height.into()),
                ConfigWindow::BorderWidth(self.border_width.into()),
            ],
        });
    }

    /// Set the border colour of the X11 window to the given value (see `crate::colours::Colours`)
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn set_border(&self, conn: &Connection<'_>, colour: u32) {
        conn.send_request(&ChangeWindowAttributes {
            window: self.window(),
            value_list: &[Cw::BorderPixel(colour)],
        });
    }

    /// Ensure this client is currently mapped / visible
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn ensure_mapped(&mut self, conn: &Connection<'_>) {
        if !self.mapped {
            conn.send_request(&MapWindow {
                window: self.window,
            });
            self.mapped = true;
        }
    }

    /// Get the associated window
    pub const fn window(&self) -> Window {
        self.window
    }

    /// Set the event mask for this window
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn set_event_mask(
        &self,
        conn: &Connection<'_>,
        event_mask: EventMask,
    ) -> VoidCookieChecked {
        conn.send_request_checked(&ChangeWindowAttributes {
            window: self.window(),
            value_list: &[Cw::EventMask(event_mask)],
        })
    }

    /// Sync the non-geometry related properties with EWMH hints
    /// This function does not check for success, so `conn.flush()` should be called after.
    pub fn sync_properties(&mut self, conn: &Connection<'_>, focused: bool) {
        let Some(mut hints) = hints::Xwm::get(conn, self.window) else {
            return;
        };

        if focused && hints.is_urgent() {
            hints.set_urgent(false);
            hints.apply(conn, self.window);
        } else {
            self.urgent = hints.is_urgent();
        }

        self.never_focus = hints.input().is_some_and(|i| !i);
    }

    /// Set the given window as withdrawn / not withdrawn.
    pub fn set_withdrawn(&self, conn: &Connection<'_>, withdrawn: bool) -> VoidCookieChecked {
        conn.send_request_checked(&ChangeProperty {
            mode: xcb::x::PropMode::Replace,
            window: self.window,
            property: conn.atoms.wm_state,
            r#type: conn.atoms.wm_state,
            data: &[u32::from(!withdrawn), 0_u32],
        })
    }

    pub fn set_urgent(&mut self, urgent: bool) {
        self.urgent = urgent;
    }

    pub const fn border_width(&self) -> u16 {
        self.border_width
    }

    pub const fn never_focus(&self) -> bool {
        self.never_focus
    }
}