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use std::{cell::RefCell, rc::Rc};

use dioxus_core::{
    prelude::{consume_context, provide_context, spawn},
    use_hook,
};
use dioxus_hooks::{use_context_provider, use_memo};
use dioxus_signals::{Readable, Signal, Writable};
use freya_common::EventMessage;
use freya_core::prelude::NativePlatformReceiver;

use crate::use_platform;

pub type AccessibilityIdCounter = Rc<RefCell<u64>>;

#[derive(Clone)]
pub struct NavigationMark(bool);

impl NavigationMark {
    pub fn allowed(&self) -> bool {
        self.0
    }

    pub fn set_allowed(&mut self, allowed: bool) {
        self.0 = allowed;
    }
}

#[derive(Clone, Copy)]
pub struct UsePlatformEvents {
    pub navigation_mark: Signal<NavigationMark>,
}

/// Keep some native features (focused element, preferred theme, etc) on sync between the platform and the components
pub fn use_init_native_platform() -> UsePlatformEvents {
    // Init the Accessibility Node ID generator
    use_context_provider(|| Rc::new(RefCell::new(0u64)));

    // Init the NavigationMark signal
    let navigation_mark = use_context_provider(|| Signal::new(NavigationMark(true)));

    // Init the signals with platform values
    let platform_state_signal = use_hook(|| {
        let mut platform_receiver = consume_context::<NativePlatformReceiver>();

        let mut platform_state_signal = Signal::new(platform_receiver.borrow().clone());

        // Listen for any changes during the execution of the app
        spawn(async move {
            while platform_receiver.changed().await.is_ok() {
                let state = platform_receiver.borrow();
                platform_state_signal.set(state.clone());
            }
        });
        platform_state_signal
    });

    let preferred_theme = use_memo(move || platform_state_signal.read().preferred_theme);

    let navigation_mode = use_memo(move || platform_state_signal.read().navigation_mode);

    let information = use_memo(move || platform_state_signal.read().information);

    let focused_id = use_memo(move || platform_state_signal.read().focused_id);

    let platform = use_platform();

    // Tell the renderer the new focused node
    use_hook(|| {
        provide_context(preferred_theme);
        provide_context(navigation_mode);
        provide_context(information);
        provide_context(focused_id);

        platform
            .send(EventMessage::FocusAccessibilityNode(*focused_id.read()))
            .unwrap();
    });

    UsePlatformEvents { navigation_mark }
}

#[cfg(test)]
mod test {
    use freya::prelude::*;
    use freya_core::{accessibility::ACCESSIBILITY_ROOT_ID, events::EventName};
    use freya_testing::prelude::*;

    #[tokio::test]
    pub async fn focus_accessibility() {
        #[allow(non_snake_case)]
        fn OtherChild() -> Element {
            let mut focus_manager = use_focus();

            rsx!(rect {
                width: "100%",
                height: "50%",
                onclick: move |_| focus_manager.focus(),
            })
        }

        fn use_focus_app() -> Element {
            rsx!(
                rect {
                    width: "100%",
                    height: "100%",
                    OtherChild {},
                    OtherChild {}
                }
            )
        }

        let mut utils = launch_test_with_config(
            use_focus_app,
            TestingConfig {
                size: (100.0, 100.0).into(),
                ..TestingConfig::default()
            },
        );

        // Initial state
        utils.wait_for_update().await;
        assert_eq!(utils.focus_id(), ACCESSIBILITY_ROOT_ID);

        // Click on the first rect
        utils.push_event(PlatformEvent::Mouse {
            name: EventName::Click,
            cursor: (5.0, 5.0).into(),
            button: Some(MouseButton::Left),
        });

        // First rect is now focused
        utils.wait_for_update().await;
        utils.wait_for_update().await;
        utils.wait_for_update().await;
        let first_focus_id = utils.focus_id();
        assert_ne!(first_focus_id, ACCESSIBILITY_ROOT_ID);

        // Click on the second rect
        utils.push_event(PlatformEvent::Mouse {
            name: EventName::Click,
            cursor: (5.0, 75.0).into(),
            button: Some(MouseButton::Left),
        });

        // Second rect is now focused
        utils.wait_for_update().await;
        utils.wait_for_update().await;
        utils.wait_for_update().await;
        let second_focus_id = utils.focus_id();
        assert_ne!(first_focus_id, second_focus_id);
        assert_ne!(second_focus_id, ACCESSIBILITY_ROOT_ID);
    }
}