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use crate::base::*;
use crate::view::{View, ViewAlign, ViewBase, ViewTree};
use crate::view::decorators::{BorderDecorator, TextDecorator};
use crate::view::decorators::BuilderViewBorderDecoratorExt;
use crate::view::decorators::BuilderViewTextDecoratorExt;
use crate::view::panels::{CanvasLayout, DockLayout, BuilderViewDockPanelExt};
use dep_obj::{Builder, Change, DepObjBuilder, DepObjId, dep_type, ext_builder};
use dep_obj::binding::{Re, Binding1, BindingExt3, Param};
use dyn_context::{State, StateExt};
use either::Right;
use alloc::borrow::Cow;
use tuifw_screen_base::*;

dep_type! {
    #[derive(Debug)]
    pub struct Window = Widget[WidgetObjKey] {
        header: Cow<'static, str> = Cow::Borrowed(""),
        #[ref]
        content: Option<Widget> = None,
        bg: Option<Color> = Some(Color::Blue),
        bounds: Rect = Rect { tl: Point { x: 0, y: 0 }, size: Vector { x: 0, y: 0 } },
    }
}

ext_builder!(<'a> Builder<'a, Widget> as BuilderWidgetWindowExt[Widget] {
    fn window() -> (Window);
});

impl<T: DepObjBuilder<Id=Widget>> WindowBuilder<T> {
    pub fn content(
        mut self,
        storage: Option<&mut Option<Widget>>,
        new: impl FnOnce(&mut dyn State) -> Widget,
    ) -> Self {
        let window = self.id();
        let content = new(self.state_mut());
        storage.map(|x| x.replace(content));
        Window::CONTENT.set(self.state_mut(), window, Some(content)).immediate();
        self
    }
}

struct WindowBehavior;

impl WidgetBehavior for WindowBehavior {
    fn init_bindings(&self, widget: Widget, state: &mut dyn State) {
        let init_new_view = Binding1::new(state, (), |(), change: Option<Change<Option<View>>>|
            change.and_then(|change| change.new)
        );
        init_new_view.set_target_fn(state, widget, |state, widget, view: View| {
            let mut header = None;
            view.build(state, |view| view
                .border_decorator(|decorator| decorator
                    .fill(Cow::Borrowed(" "))
                    .enable_t_padding(false)
                )
                .dock_panel(|panel| panel
                    .child(Some(&mut header), (), |layout| layout.dock(Right(Side::Top)), |child| child
                        .text_decorator(|decorator| decorator)
                    )
                )
            );
            header.unwrap().bind_decorator_to_widget(state, TextDecorator::TEXT, widget, Window::HEADER, |x| x);
            view.bind_base_to_widget(state, ViewBase::BG, widget, Window::BG, |x| x);
            view.bind_layout_to_widget(state, CanvasLayout::TL, widget, Window::BOUNDS, |x| x.tl);
            view.bind_align_to_widget(state, ViewAlign::W, widget, Window::BOUNDS, |x| Some(x.w()));
            view.bind_align_to_widget(state, ViewAlign::H, widget, Window::BOUNDS, |x| Some(x.h()));
            view.bind_decorator_to_base(state, BorderDecorator::TL, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "╔" } else { "┌" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::TR, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "╗" } else { "┐" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::BL, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "╚" } else { "└" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::BR, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "╝" } else { "┘" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::L, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "║" } else { "│" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::T, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "═" } else { "─" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::R, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "║" } else { "│" })
            );
            view.bind_decorator_to_base(state, BorderDecorator::B, ViewBase::IS_FOCUSED, |focused|
                Cow::Borrowed(if focused { "═" } else { "─" })
            );
        });
        widget.add_binding::<Window, _>(state, init_new_view);
        init_new_view.set_source_1(state, &mut WidgetBase::VIEW.change_initial_source(widget));

        let content = BindingExt3::new(state, (None, None), |
            state,
            content_cache: Param<(Option<Widget>, Option<View>)>,
            view: Option<View>,
            new_content: Option<Change<Option<Widget>>>,
            old_content: Option<Change<Option<Widget>>>,
        | -> Re<!> {
            if let Some(content) = new_content {
                content_cache.get_mut(state).0 = content.new;
                if let Some(view) = view {
                    if let Some(content) = content.new {
                        let view_tree: &ViewTree = state.get();
                        let prev = view.last_child(view_tree);
                        return content.load(state, view, prev, |state, content_view|
                            DockLayout::new(state, content_view)
                        );
                    } else {
                        let view_tree: &ViewTree = state.get();
                        let prev = view.last_child(view_tree);
                        let content_view = View::new(state, view, prev);
                        DockLayout::new(state, content_view);
                        let ok = content_cache.get_mut(state).1.replace(content_view).is_none();
                        debug_assert!(ok);
                    }
                }
            } else if let Some(content) = old_content {
                if view.is_some() {
                    if let Some(content) = content.old {
                        return content.unload(state);
                    } else {
                        content_cache.get_mut(state).1.take().unwrap().drop_view(state);
                    }
                }
            } else {
                if let Some(content) = content_cache.get(state).0 {
                    if let Some(view) = view {
                        let view_tree: &ViewTree = state.get();
                        let prev = view.last_child(view_tree);
                        return content.load(state, view, prev, |state, content_view|
                            DockLayout::new(state, content_view)
                        );
                    } else {
                        return content.unload(state);
                    }
                } else {
                    if let Some(view) = view {
                        let view_tree: &ViewTree = state.get();
                        let prev = view.last_child(view_tree);
                        let content_view = View::new(state, view, prev);
                        DockLayout::new(state, content_view);
                        let ok = content_cache.get_mut(state).1.replace(content_view).is_none();
                        debug_assert!(ok);
                    } else {
                        content_cache.get_mut(state).1.take().unwrap().drop_view(state);
                    }
                }
            }
            Re::Continue
        });
        widget.add_binding::<Window, _>(state, content);
        content.set_source_1(state, &mut WidgetBase::VIEW.value_source(widget));
        content.set_source_2(state, &mut Window::CONTENT.change_initial_source(widget));
        content.set_source_3(state, &mut Window::CONTENT.change_final_source(widget));
    }

    fn drop_bindings(&self, _widget: Widget, _state: &mut dyn State) { }
}

impl Window {
    const BEHAVIOR: WindowBehavior = WindowBehavior;

    #[allow(clippy::new_ret_no_self)]
    pub fn new(state: &mut dyn State) -> Widget {
        Widget::new(state, Window::new_priv())
    }
}

impl WidgetObj for Window {
    fn behavior(&self) -> &'static dyn WidgetBehavior { &Self::BEHAVIOR }
}