use xcb::{
    x::{
        self, ChangeProperty, ChangeWindowAttributes, ConfigWindow, ConfigWindowMask,
        ConfigureNotifyEvent, ConfigureWindow, Cw, EventMask, MapWindow, PropMode, SendEvent,
        SendEventDest, StackMode, UnmapWindow, Window,
    },
    VoidCookieChecked, Xid,
};

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

use super::{hints, MonitorGeometry, Tag};

/// Information about a single client / window
#[derive(Debug)]
#[allow(clippy::struct_excessive_bools)]
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,
    layout_mode: LayoutMode,

    pub tag: Tag,
}

/// How this window's geometry is determined,
#[derive(Debug)]
pub enum LayoutMode {
    /// By the tiling algorithm
    Tiled,

    /// By the user
    Floating,

    /// By the monitor its on
    Fullscreen,
}

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

    /// Send a configure notify event with the current geometry.
    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.
    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 client's geometry as requested by the given event.
    /// Properties not specified in `e` are not changed.
    pub fn set_geom_from(&mut self, conn: &Connection, e: &x::ConfigureRequestEvent) {
        let Self {
            mut x,
            mut y,
            mut width,
            mut height,
            mut border_width,
            ..
        } = self;

        if e.value_mask().contains(ConfigWindowMask::X) {
            x = e.x();
        }
        if e.value_mask().contains(ConfigWindowMask::Y) {
            y = e.y();
        }
        if e.value_mask().contains(ConfigWindowMask::HEIGHT) {
            height = e.height();
        }
        if e.value_mask().contains(ConfigWindowMask::WIDTH) {
            width = e.width();
        }
        if e.value_mask().contains(ConfigWindowMask::BORDER_WIDTH) {
            border_width = e.border_width();
        }

        self.set_geom(conn, x, y, height, width, border_width);
    }

    /// Set the border colour of the X11 window to the given value (see `crate::colours::Colours`)
    pub fn set_border(&self, conn: &Connection<'_>, colour: u32) {
        conn.send_request(&ChangeWindowAttributes {
            window: self.window(),
            value_list: &[Cw::BorderPixel(colour)],
        });
    }

    /// Whether the client is tiled
    pub const fn tiled(&self) -> bool {
        matches!(self.layout_mode, LayoutMode::Tiled)
    }

    /// Whether the client is fullscreen
    pub const fn fullscreen(&self) -> bool {
        matches!(self.layout_mode, LayoutMode::Fullscreen)
    }

    /// Whether the client is floating
    pub const fn floating(&self) -> bool {
        matches!(self.layout_mode, LayoutMode::Floating)
    }

    /// Set the window as tiled
    pub fn set_tiled(&mut self, conn: &Connection<'_>) {
        let dirty = !matches!(self.layout_mode, LayoutMode::Tiled);
        self.layout_mode = LayoutMode::Tiled;
        if dirty {
            self.apply_net_wm_state(conn);
        }
    }

    /// Set the window as floating
    pub fn set_floating(&mut self, conn: &Connection<'_>) {
        let dirty = !matches!(self.layout_mode, LayoutMode::Floating);
        self.layout_mode = LayoutMode::Floating;

        if dirty {
            conn.send_request(&ConfigureWindow {
                window: self.window,
                value_list: &[ConfigWindow::StackMode(StackMode::Above)],
            });
            self.apply_net_wm_state(conn);
        }
    }

    /// Set the window as fullscreen
    pub fn set_fullscreen(&mut self, conn: &Connection<'_>, mon_geom: &MonitorGeometry) {
        let dirty = !matches!(self.layout_mode, LayoutMode::Fullscreen);
        self.layout_mode = LayoutMode::Fullscreen;

        if dirty {
            conn.send_request(&ConfigureWindow {
                window: self.window,
                value_list: &[ConfigWindow::StackMode(StackMode::Above)],
            });

            self.set_geom(
                conn,
                mon_geom.x_org,
                mon_geom.y_org,
                mon_geom.width,
                mon_geom.height,
                self.border_width,
            );
            self.apply_net_wm_state(conn);
        }
    }

    fn apply_net_wm_state(&self, conn: &Connection<'_>) {
        conn.send_request(&ChangeProperty {
            mode: PropMode::Replace,
            window: self.window,
            property: conn.atoms.net_wm_state,
            r#type: x::ATOM_ATOM,
            data: &[match self.layout_mode {
                LayoutMode::Tiled | LayoutMode::Floating => 0_u32,
                LayoutMode::Fullscreen => conn.atoms.net_wm_fullscreen.resource_id(),
            }],
        });
    }

    /// Ensure this client is currently unmapped
    pub fn ensure_unmapped(&mut self, conn: &Connection<'_>) {
        if self.mapped {
            conn.send_request(&UnmapWindow {
                window: self.window,
            });
            self.mapped = false;
        }
    }

    /// Ensure this client is currently mapped / visible
    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
    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 hints with EWMH hints
    pub fn sync_hints(&mut self, conn: &Connection<'_>, focused: bool) {
        let Some(mut hints) = hints::Ewm::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);
    }

    /// Apply any geometry-related EWM hints on the window
    pub fn apply_geometry_hints(&mut self, conn: &Connection<'_>, mon_geom: &MonitorGeometry) {
        if hints::is_fullscreen(conn, self.window) {
            self.set_fullscreen(conn, mon_geom);
        } else if hints::is_dialog(conn, self.window) {
            self.set_floating(conn);
        }
    }

    /// 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 x(&self) -> i16 {
        self.x
    }

    pub const fn y(&self) -> i16 {
        self.y
    }

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

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

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

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