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use std::ops::Deref;

use crate::icons::ICON_CHEVRON_DOWN;
use crate::prelude::*;

pub struct PickList {
    on_select: Option<Box<dyn Fn(&mut EventContext, usize)>>,
}

pub enum PickListEvent {
    SetOption(usize),
}

impl PickList {
    pub fn new<L1, L2, T>(
        cx: &mut Context,
        list_lens: L1,
        selected: L2,
        show_handle: bool,
    ) -> Handle<Self>
    where
        L1: Lens,
        L1::Target: Deref<Target = [T]> + Data,
        T: 'static + Data + ToStringLocalized,
        L2: Lens<Target = usize>,
    {
        Self { on_select: None }.build(cx, |cx| {
            // Dropdown List
            Dropdown::new(
                cx,
                move |cx| {
                    Button::new(cx, |cx| {
                        // A Label and an optional Icon
                        HStack::new(cx, move |cx| {
                            Label::new(cx, "")
                                .bind(list_lens, move |handle, list| {
                                    handle.bind(selected, move |handle, sel| {
                                        let selected_index = sel.get(&handle);
                                        handle.text(list.idx(selected_index));
                                    });
                                })
                                .hoverable(false);
                            if show_handle {
                                Svg::new(cx, ICON_CHEVRON_DOWN)
                                    .class("icon")
                                    .size(Pixels(16.0))
                                    .hoverable(false);
                            }
                        })
                        .child_left(Pixels(0.0))
                        .child_right(Pixels(0.0))
                        .width(Stretch(1.0))
                        .col_between(Stretch(1.0))
                    })
                    .width(Stretch(1.0))
                    .on_press(|cx| cx.emit(PopupEvent::Switch));
                },
                move |cx| {
                    ScrollView::new(cx, 0.0, 0.0, false, true, move |cx| {
                        List::new(cx, list_lens, move |cx, index, item| {
                            Label::new(cx, item)
                                .child_top(Stretch(1.0))
                                .child_bottom(Stretch(1.0))
                                .checked(selected.map(move |selected| *selected == index))
                                .navigable(true)
                                .on_press(move |cx| {
                                    cx.emit(PickListEvent::SetOption(index));
                                    cx.emit(PopupEvent::Close);
                                });
                        });
                    })
                    .height(Auto);
                },
            )
            .width(Stretch(1.0));
        })
    }
}

impl View for PickList {
    fn element(&self) -> Option<&'static str> {
        Some("picklist")
    }

    fn event(&mut self, cx: &mut EventContext, event: &mut Event) {
        event.map(|picklist_event, _| match picklist_event {
            PickListEvent::SetOption(index) => {
                if let Some(callback) = &self.on_select {
                    (callback)(cx, *index);
                }
            }
        });
    }
}

impl<'v> Handle<'v, PickList> {
    pub fn on_select<F>(self, callback: F) -> Self
    where
        F: 'static + Fn(&mut EventContext, usize),
    {
        self.modify(|picklist: &mut PickList| picklist.on_select = Some(Box::new(callback)))
    }
}

pub struct ScrollList {
    on_select: Option<Box<dyn Fn(&mut EventContext, usize)>>,
}

impl ScrollList {
    pub fn new<L1, L2, T>(cx: &mut Context, list_lens: L1, selected: L2) -> Handle<Self>
    where
        L1: Lens,
        L1::Target: Deref<Target = [T]> + Data,
        T: 'static + Data + ToStringLocalized,
        L2: Lens<Target = usize>,
    {
        Self { on_select: None }
            .build(cx, |cx| {
                // Dropdown List

                let window_height = cx.cache.get_height(Entity::root());
                let scale = cx.scale_factor();
                ScrollView::new(cx, 0.0, 0.0, false, true, move |cx| {
                    List::new(cx, list_lens, move |cx, index, item| {
                        Label::new(cx, item)
                            .child_top(Stretch(1.0))
                            .child_bottom(Stretch(1.0))
                            .checked(selected.map(move |selected| *selected == index))
                            .navigable(true)
                            .on_press(move |cx| {
                                cx.emit(PickListEvent::SetOption(index));
                                // cx.emit(PopupEvent::Close);s
                            });
                    });
                })
                .height(Auto)
                .max_height(Pixels(window_height / scale));
            })
            .height(Auto)
    }
}

impl View for ScrollList {
    fn element(&self) -> Option<&'static str> {
        Some("scroll-list")
    }

    fn event(&mut self, cx: &mut EventContext, event: &mut Event) {
        event.map(|picklist_event, _| match picklist_event {
            PickListEvent::SetOption(index) => {
                if let Some(callback) = &self.on_select {
                    (callback)(cx, *index);
                }
            }
        });
    }
}

impl<'v> Handle<'v, ScrollList> {
    pub fn on_select<F>(self, callback: F) -> Self
    where
        F: 'static + Fn(&mut EventContext, usize),
    {
        self.modify(|scroll_list: &mut ScrollList| scroll_list.on_select = Some(Box::new(callback)))
    }
}