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// Copyright 2022 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use std::path::Path;

use base::AsRawDescriptor;
use base::RawDescriptor;
use base::WaitContext;

use crate::gpu_display_wl::DisplayWl;
use crate::DisplayEventToken;
use crate::DisplayT;
use crate::EventDevice;
use crate::GpuDisplay;
use crate::GpuDisplayExt;
use crate::GpuDisplayResult;

pub(crate) trait UnixDisplayT: DisplayT {}

impl GpuDisplayExt for GpuDisplay {
    fn import_event_device(&mut self, event_device: EventDevice) -> GpuDisplayResult<u32> {
        let new_event_device_id = self.next_id;

        self.wait_ctx.add(
            &event_device,
            DisplayEventToken::EventDevice {
                event_device_id: new_event_device_id,
            },
        )?;
        self.event_devices.insert(new_event_device_id, event_device);

        self.next_id += 1;
        Ok(new_event_device_id)
    }

    fn handle_event_device(&mut self, event_device_id: u32) {
        if let Some(event_device) = self.event_devices.get(&event_device_id) {
            // TODO(zachr): decode the event and forward to the device.
            let _ = event_device.recv_event_encoded();
        }
    }
}

pub trait UnixGpuDisplayExt {
    /// Opens a fresh connection to the compositor.
    fn open_wayland<P: AsRef<Path>>(wayland_path: Option<P>) -> GpuDisplayResult<GpuDisplay>;
}

impl UnixGpuDisplayExt for GpuDisplay {
    fn open_wayland<P: AsRef<Path>>(wayland_path: Option<P>) -> GpuDisplayResult<GpuDisplay> {
        let display = match wayland_path {
            Some(s) => DisplayWl::new(Some(s.as_ref()))?,
            None => DisplayWl::new(None)?,
        };

        let wait_ctx = WaitContext::new()?;
        wait_ctx.add(&display, DisplayEventToken::Display)?;

        Ok(GpuDisplay {
            inner: Box::new(display),
            next_id: 1,
            event_devices: Default::default(),
            surfaces: Default::default(),
            wait_ctx,
        })
    }
}

impl AsRawDescriptor for GpuDisplay {
    fn as_raw_descriptor(&self) -> RawDescriptor {
        self.wait_ctx.as_raw_descriptor()
    }
}