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// Copyright 2022 The AccessKit Authors. All rights reserved.
// Licensed under the Apache License, Version 2.0 (found in
// the LICENSE-APACHE file).

use accesskit::{ActionHandler, ActionRequest, TreeUpdate};
use parking_lot::Mutex;
use winit::{
    event_loop::EventLoopProxy,
    window::{Window, WindowId},
};

mod platform_impl;

#[derive(Debug)]
pub struct ActionRequestEvent {
    pub window_id: WindowId,
    pub request: ActionRequest,
}

struct WinitActionHandler<T: From<ActionRequestEvent> + Send + 'static> {
    window_id: WindowId,
    proxy: Mutex<EventLoopProxy<T>>,
}

impl<T: From<ActionRequestEvent> + Send + 'static> ActionHandler for WinitActionHandler<T> {
    fn do_action(&self, request: ActionRequest) {
        let proxy = self.proxy.lock();
        let event = ActionRequestEvent {
            window_id: self.window_id,
            request,
        };
        proxy.send_event(event.into()).ok();
    }
}

pub struct Adapter {
    adapter: platform_impl::Adapter,
}

impl Adapter {
    pub fn new<T: From<ActionRequestEvent> + Send + 'static>(
        window: &Window,
        source: impl 'static + FnOnce() -> TreeUpdate + Send,
        event_loop_proxy: EventLoopProxy<T>,
    ) -> Self {
        let action_handler = WinitActionHandler {
            window_id: window.id(),
            proxy: Mutex::new(event_loop_proxy),
        };
        Self::with_action_handler(window, source, Box::new(action_handler))
    }

    /// Use this if you need to provide your own AccessKit action handler
    /// rather than dispatching action requests through the winit event loop.
    /// Remember that an AccessKit action handler can be called on any thread,
    /// depending on the underlying AccessKit platform adapter.
    pub fn with_action_handler(
        window: &Window,
        source: impl 'static + FnOnce() -> TreeUpdate + Send,
        action_handler: Box<dyn ActionHandler>,
    ) -> Self {
        let adapter = platform_impl::Adapter::new(window, source, action_handler);
        Self { adapter }
    }

    pub fn update(&self, update: TreeUpdate) {
        self.adapter.update(update)
    }

    pub fn update_if_active(&self, updater: impl FnOnce() -> TreeUpdate) {
        self.adapter.update_if_active(updater)
    }
}