use {
    crate::{
        async_engine::SpawnedFuture,
        backend::transaction::{
            BackendConnectorTransaction, BackendConnectorTransactionError,
            BackendConnectorTransactionType, BackendConnectorTransactionTypeDyn,
        },
        drm_feedback::DrmFeedback,
        format::Format,
        gfx_api::{FdSync, GfxApi, GfxFramebuffer},
        video::drm::{ConnectorType, DrmConnector, DrmError, DrmVersion},
    },
    std::{
        any::Any,
        error::Error,
        fmt::{Debug, Display, Formatter},
        rc::Rc,
    },
    uapi::{OwnedFd, c},
};

pub mod transaction;

pub use jay_output_types::{
    BackendColorSpace, BackendConnectorState, BackendConnectorStateSerial,
    BackendConnectorStateSerials, BackendEotfs, BackendGammaLut, BackendGammaLutElement,
    BackendLuminance, CONCAP_CONNECTOR, CONCAP_MODE_SETTING, CONCAP_PHYSICAL_DISPLAY,
    ConnectorCaps, ConnectorId, ConnectorIds, DrmDeviceId, DrmDeviceIds, Mode, MonitorInfo,
    OutputId,
};

pub use jay_input_types::{
    AXIS_120, AxisSource, ButtonState, InputDeviceAccelProfile, InputDeviceCapability,
    InputDeviceClickMethod, InputDeviceGroupId, InputDeviceGroupIds, InputDeviceId,
    InputDeviceIds, InputEvent, KeyState, Leds, PadButtonState, ScrollAxis, SwitchEvent, TabletId,
    TabletIds, TabletInit, TabletPadGroupInit, TabletPadId, TabletPadIds, TabletPadInit,
    TabletRingEventSource, TabletStripEventSource, TabletTool2dChange, TabletToolCapability,
    TabletToolChanges, TabletToolId, TabletToolIds, TabletToolInit, TabletToolPositionChange,
    TabletToolType, TabletToolWheelChange, ToolButtonState, TransformMatrix,
};

pub trait Backend: Any {
    fn run(self: Rc<Self>) -> SpawnedFuture<Result<(), Box<dyn Error>>>;
    fn clear(&self) {
        // nothing
    }

    fn switch_to(&self, vtnr: u32) {
        let _ = vtnr;
    }

    fn import_environment(&self) -> bool {
        false
    }

    fn supports_presentation_feedback(&self) -> bool {
        false
    }

    fn get_input_fds(&self) -> Vec<Rc<OwnedFd>> {
        vec![]
    }
}

#[derive(Copy, Clone, Debug)]
pub struct ConnectorKernelId {
    pub ty: ConnectorType,
    pub idx: u32,
}

impl Display for ConnectorKernelId {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}-{}", self.ty, self.idx)
    }
}

pub trait Connector: Any {
    fn id(&self) -> ConnectorId;
    fn kernel_id(&self) -> ConnectorKernelId;
    fn event(&self) -> Option<ConnectorEvent>;
    fn on_change(&self, cb: Rc<dyn Fn()>);
    fn damage(&self);
    fn drm_dev(&self) -> Option<DrmDeviceId>;
    fn effectively_locked(&self) -> bool;
    fn state(&self) -> BackendConnectorState;
    fn caps(&self) -> ConnectorCaps {
        ConnectorCaps::none()
    }
    fn drm_feedback(&self) -> Option<Rc<DrmFeedback>> {
        None
    }
    fn drm_object_id(&self) -> Option<DrmConnector> {
        None
    }
    fn before_non_desktop_override_update(&self, overrd: Option<bool>) {
        let _ = overrd;
    }
    fn transaction_type(&self) -> Box<dyn BackendConnectorTransactionTypeDyn> {
        #[derive(Hash, Eq, PartialEq)]
        struct UnimplementedConnectorTransactionType;
        impl BackendConnectorTransactionType for UnimplementedConnectorTransactionType {}
        Box::new(UnimplementedConnectorTransactionType)
    }
    fn create_transaction(
        &self,
    ) -> Result<Box<dyn BackendConnectorTransaction>, BackendConnectorTransactionError> {
        Err(BackendConnectorTransactionError::TransactionsNotSupported(
            self.kernel_id(),
        ))
    }
    fn gamma_lut_size(&self) -> Option<u32> {
        None
    }
    fn name(&self) -> String {
        self.kernel_id().to_string()
    }
}

#[derive(Debug)]
pub enum ConnectorEvent {
    Connected(MonitorInfo),
    HardwareCursor(Option<Rc<dyn HardwareCursor>>),
    Disconnected,
    Removed,
    Unavailable,
    Available,
    State(BackendConnectorState),
    FormatsChanged(Rc<Vec<&'static Format>>),
}

pub trait HardwareCursorUpdate {
    fn set_enabled(&mut self, enabled: bool);
    fn get_buffer(&self) -> Rc<dyn GfxFramebuffer>;
    fn set_position(&mut self, x: i32, y: i32);
    fn swap_buffer(&mut self, sync: Option<FdSync>);
    fn size(&self) -> (i32, i32);
}

pub trait HardwareCursor: Debug {
    fn damage(&self);
}

pub trait InputDevice {
    fn id(&self) -> InputDeviceId;
    fn removed(&self) -> bool;
    fn event(&self) -> Option<InputEvent>;
    fn on_change(&self, cb: Rc<dyn Fn()>);
    fn grab(&self, grab: bool);
    fn has_capability(&self, cap: InputDeviceCapability) -> bool;
    fn left_handed(&self) -> Option<bool> {
        None
    }
    fn set_left_handed(&self, left_handed: bool);
    fn accel_profile(&self) -> Option<InputDeviceAccelProfile> {
        None
    }
    fn set_accel_profile(&self, profile: InputDeviceAccelProfile);
    fn accel_speed(&self) -> Option<f64> {
        None
    }
    fn set_accel_speed(&self, speed: f64);
    fn transform_matrix(&self) -> Option<TransformMatrix> {
        None
    }
    fn set_transform_matrix(&self, matrix: TransformMatrix);
    fn calibration_matrix(&self) -> Option<[[f32; 3]; 2]> {
        None
    }
    fn set_calibration_matrix(&self, m: [[f32; 3]; 2]) {
        let _ = m;
    }
    fn name(&self) -> Rc<String>;
    fn dev_t(&self) -> Option<c::dev_t> {
        None
    }
    fn tap_enabled(&self) -> Option<bool> {
        None
    }
    fn set_tap_enabled(&self, enabled: bool);
    fn drag_enabled(&self) -> Option<bool> {
        None
    }
    fn set_drag_enabled(&self, enabled: bool);
    fn drag_lock_enabled(&self) -> Option<bool> {
        None
    }
    fn set_drag_lock_enabled(&self, enabled: bool);
    fn natural_scrolling_enabled(&self) -> Option<bool> {
        None
    }
    fn set_natural_scrolling_enabled(&self, enabled: bool);
    fn click_method(&self) -> Option<InputDeviceClickMethod> {
        None
    }
    fn set_click_method(&self, method: InputDeviceClickMethod);
    fn middle_button_emulation_enabled(&self) -> Option<bool> {
        None
    }
    fn set_middle_button_emulation_enabled(&self, enabled: bool);
    fn tablet_info(&self) -> Option<Box<TabletInit>> {
        None
    }
    fn tablet_pad_info(&self) -> Option<Box<TabletPadInit>> {
        None
    }

    fn set_enabled_leds(&self, leds: Leds) {
        let _ = leds;
    }
}

pub enum BackendEvent {
    NewDrmDevice(Rc<dyn BackendDrmDevice>),
    NewConnector(Rc<dyn Connector>),
    NewInputDevice(Rc<dyn InputDevice>),
    DevicesEnumerated,
}

pub enum DrmEvent {
    #[expect(dead_code)]
    Removed,
    GfxApiChanged,
}

pub trait BackendDrmDevice {
    fn id(&self) -> DrmDeviceId;
    fn event(&self) -> Option<DrmEvent>;
    fn on_change(&self, cb: Rc<dyn Fn()>);
    fn dev_t(&self) -> c::dev_t;
    fn make_render_device(&self);
    fn set_gfx_api(&self, api: GfxApi);
    fn gtx_api(&self) -> GfxApi;
    fn version(&self) -> Result<DrmVersion, DrmError>;
    fn set_direct_scanout_enabled(&self, enabled: bool);
    fn is_render_device(&self) -> bool;
    fn direct_scanout_enabled(&self) -> bool {
        false
    }
    fn gfx_fast_ram_access(&self) -> bool {
        false
    }
    fn create_lease(
        self: Rc<Self>,
        lessee: Rc<dyn BackendDrmLessee>,
        connector_ids: &[ConnectorId],
    ) {
        let _ = lessee;
        let _ = connector_ids;
    }
    fn set_flip_margin(&self, margin: u64) {
        let _ = margin;
    }
}

pub trait BackendDrmLease {
    fn fd(&self) -> &Rc<OwnedFd>;
}

pub trait BackendDrmLessee {
    fn created(&self, lease: Rc<dyn BackendDrmLease>);
}