use fuzzy::StringMatchCandidate;
use gpui::{div, prelude::*, KeyBinding, Render, SharedString, Styled, Task, View, WindowContext};
use picker::{Picker, PickerDelegate};
use std::sync::Arc;
use ui::{prelude::*, ListItemSpacing};
use ui::{Label, ListItem};

pub struct PickerStory {
    picker: View<Picker<Delegate>>,
}

struct Delegate {
    candidates: Arc<[StringMatchCandidate]>,
    matches: Vec<usize>,
    selected_ix: usize,
}

impl Delegate {
    fn new(strings: &[&str]) -> Self {
        Self {
            candidates: strings
                .iter()
                .copied()
                .enumerate()
                .map(|(id, string)| StringMatchCandidate {
                    id,
                    char_bag: string.into(),
                    string: string.into(),
                })
                .collect(),
            matches: vec![],
            selected_ix: 0,
        }
    }
}

impl PickerDelegate for Delegate {
    type ListItem = ListItem;

    fn match_count(&self) -> usize {
        self.candidates.len()
    }

    fn placeholder_text(&self, _cx: &mut WindowContext) -> Arc<str> {
        "Test".into()
    }

    fn render_match(
        &self,
        ix: usize,
        selected: bool,
        _cx: &mut gpui::ViewContext<Picker<Self>>,
    ) -> Option<Self::ListItem> {
        let candidate_ix = self.matches.get(ix)?;
        // TASK: Make StringMatchCandidate::string a SharedString
        let candidate = SharedString::from(self.candidates[*candidate_ix].string.clone());

        Some(
            ListItem::new(ix)
                .inset(true)
                .spacing(ListItemSpacing::Sparse)
                .selected(selected)
                .child(Label::new(candidate)),
        )
    }

    fn selected_index(&self) -> usize {
        self.selected_ix
    }

    fn set_selected_index(&mut self, ix: usize, cx: &mut gpui::ViewContext<Picker<Self>>) {
        self.selected_ix = ix;
        cx.notify();
    }

    fn confirm(&mut self, secondary: bool, _cx: &mut gpui::ViewContext<Picker<Self>>) {
        let candidate_ix = self.matches[self.selected_ix];
        let candidate = self.candidates[candidate_ix].string.clone();

        if secondary {
            eprintln!("Secondary confirmed {}", candidate)
        } else {
            eprintln!("Confirmed {}", candidate)
        }
    }

    fn dismissed(&mut self, cx: &mut gpui::ViewContext<Picker<Self>>) {
        cx.quit();
    }

    fn update_matches(
        &mut self,
        query: String,
        cx: &mut gpui::ViewContext<Picker<Self>>,
    ) -> Task<()> {
        let candidates = self.candidates.clone();
        self.matches = cx
            .background_executor()
            .block(fuzzy::match_strings(
                &candidates,
                &query,
                true,
                100,
                &Default::default(),
                cx.background_executor().clone(),
            ))
            .into_iter()
            .map(|r| r.candidate_id)
            .collect();
        self.selected_ix = 0;
        Task::ready(())
    }
}

impl PickerStory {
    pub fn new(cx: &mut WindowContext) -> View<Self> {
        cx.new_view(|cx| {
            cx.bind_keys([
                KeyBinding::new("up", menu::SelectPrev, Some("picker")),
                KeyBinding::new("pageup", menu::SelectFirst, Some("picker")),
                KeyBinding::new("shift-pageup", menu::SelectFirst, Some("picker")),
                KeyBinding::new("ctrl-p", menu::SelectPrev, Some("picker")),
                KeyBinding::new("down", menu::SelectNext, Some("picker")),
                KeyBinding::new("pagedown", menu::SelectLast, Some("picker")),
                KeyBinding::new("shift-pagedown", menu::SelectFirst, Some("picker")),
                KeyBinding::new("ctrl-n", menu::SelectNext, Some("picker")),
                KeyBinding::new("cmd-up", menu::SelectFirst, Some("picker")),
                KeyBinding::new("cmd-down", menu::SelectLast, Some("picker")),
                KeyBinding::new("enter", menu::Confirm, Some("picker")),
                KeyBinding::new("ctrl-enter", menu::SecondaryConfirm, Some("picker")),
                KeyBinding::new("cmd-enter", menu::SecondaryConfirm, Some("picker")),
                KeyBinding::new("escape", menu::Cancel, Some("picker")),
                KeyBinding::new("ctrl-c", menu::Cancel, Some("picker")),
            ]);

            PickerStory {
                picker: cx.new_view(|cx| {
                    let mut delegate = Delegate::new(&[
                        "Baguette (France)",
                        "Baklava (Turkey)",
                        "Beef Wellington (UK)",
                        "Biryani (India)",
                        "Borscht (Ukraine)",
                        "Bratwurst (Germany)",
                        "Bulgogi (Korea)",
                        "Burrito (USA)",
                        "Ceviche (Peru)",
                        "Chicken Tikka Masala (India)",
                        "Churrasco (Brazil)",
                        "Couscous (North Africa)",
                        "Croissant (France)",
                        "Dim Sum (China)",
                        "Empanada (Argentina)",
                        "Fajitas (Mexico)",
                        "Falafel (Middle East)",
                        "Feijoada (Brazil)",
                        "Fish and Chips (UK)",
                        "Fondue (Switzerland)",
                        "Goulash (Hungary)",
                        "Haggis (Scotland)",
                        "Kebab (Middle East)",
                        "Kimchi (Korea)",
                        "Lasagna (Italy)",
                        "Maple Syrup Pancakes (Canada)",
                        "Moussaka (Greece)",
                        "Pad Thai (Thailand)",
                        "Paella (Spain)",
                        "Pancakes (USA)",
                        "Pasta Carbonara (Italy)",
                        "Pavlova (Australia)",
                        "Peking Duck (China)",
                        "Pho (Vietnam)",
                        "Pierogi (Poland)",
                        "Pizza (Italy)",
                        "Poutine (Canada)",
                        "Pretzel (Germany)",
                        "Ramen (Japan)",
                        "Rendang (Indonesia)",
                        "Sashimi (Japan)",
                        "Satay (Indonesia)",
                        "Shepherd's Pie (Ireland)",
                        "Sushi (Japan)",
                        "Tacos (Mexico)",
                        "Tandoori Chicken (India)",
                        "Tortilla (Spain)",
                        "Tzatziki (Greece)",
                        "Wiener Schnitzel (Austria)",
                    ]);
                    delegate.update_matches("".into(), cx).detach();

                    let picker = Picker::uniform_list(delegate, cx);
                    picker.focus(cx);
                    picker
                }),
            }
        })
    }
}

impl Render for PickerStory {
    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl IntoElement {
        div()
            .bg(cx.theme().styles.colors.background)
            .size_full()
            .child(self.picker.clone())
    }
}
