use std::rc::Rc;

use gpui::{
    div, impl_internal_actions, prelude::FluentBuilder, px, App, AppContext, Corner, Element,
    InteractiveElement, IntoElement, ParentElement, RenderOnce, SharedString,
    StatefulInteractiveElement, Styled, WeakEntity, Window,
};
use serde::Deserialize;
use theme::ActiveTheme;

use crate::{
    button::{Button, ButtonVariants},
    input::InputState,
    popover::{Popover, PopoverContent},
    Icon,
};

#[derive(PartialEq, Clone, Debug, Deserialize)]
pub struct EmitEmoji(pub SharedString);

impl_internal_actions!(emoji, [EmitEmoji]);

#[derive(IntoElement)]
pub struct EmojiPicker {
    icon: Option<Icon>,
    anchor: Option<Corner>,
    target_input: WeakEntity<InputState>,
    emojis: Rc<Vec<SharedString>>,
}

impl EmojiPicker {
    pub fn new(target_input: WeakEntity<InputState>) -> Self {
        let mut emojis: Vec<SharedString> = vec![];

        emojis.extend(
            emojis::Group::SmileysAndEmotion
                .emojis()
                .map(|e| SharedString::from(e.as_str()))
                .collect::<Vec<SharedString>>(),
        );

        Self {
            target_input,
            emojis: emojis.into(),
            anchor: None,
            icon: None,
        }
    }

    pub fn icon(mut self, icon: impl Into<Icon>) -> Self {
        self.icon = Some(icon.into());
        self
    }

    pub fn anchor(mut self, corner: Corner) -> Self {
        self.anchor = Some(corner);
        self
    }
}

impl RenderOnce for EmojiPicker {
    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {
        Popover::new("emoji-picker")
            .map(|this| {
                if let Some(corner) = self.anchor {
                    this.anchor(corner)
                } else {
                    this.anchor(gpui::Corner::BottomLeft)
                }
            })
            .trigger(
                Button::new("emoji-trigger")
                    .when_some(self.icon, |this, icon| this.icon(icon))
                    .ghost(),
            )
            .content(move |window, cx| {
                let emojis = self.emojis.clone();
                let input = self.target_input.clone();

                cx.new(|cx| {
                    PopoverContent::new(window, cx, move |_window, cx| {
                        div()
                            .flex()
                            .flex_wrap()
                            .items_center()
                            .gap_2()
                            .children(emojis.iter().map(|e| {
                                div()
                                    .id(e.clone())
                                    .flex_auto()
                                    .size_10()
                                    .flex()
                                    .items_center()
                                    .justify_center()
                                    .rounded(cx.theme().radius)
                                    .child(e.clone())
                                    .hover(|this| this.bg(cx.theme().ghost_element_hover))
                                    .on_click({
                                        let item = e.clone();
                                        let input = input.upgrade();

                                        move |_, window, cx| {
                                            if let Some(input) = input.as_ref() {
                                                input.update(cx, |this, cx| {
                                                    let current = this.value();
                                                    let new_text = if current.is_empty() {
                                                        format!("{}", item)
                                                    } else if current.ends_with(" ") {
                                                        format!("{}{}", current, item)
                                                    } else {
                                                        format!("{} {}", current, item)
                                                    };
                                                    this.set_value(new_text, window, cx);
                                                });
                                            }
                                        }
                                    })
                            }))
                            .into_any()
                    })
                    .scrollable()
                    .max_h(px(300.))
                    .max_w(px(300.))
                })
            })
    }
}