use crate::data;
use druid::widget::{Controller, Padding};
use druid::{
    widget::{Container, Flex, Label, LensWrap, TextBox},
    Color, FontDescriptor, FontFamily, FontWeight, RenderContext, Widget, WidgetExt, WidgetPod,
};
use druid::{Data, LifeCycle, TextAlignment};

pub struct ModalContainer {
    child: WidgetPod<data::AppData, Box<dyn Widget<data::AppData>>>,
    modal: Option<WidgetPod<data::AppData, Box<dyn Widget<data::AppData>>>>,
}

impl ModalContainer {
    pub fn new(child: impl Widget<data::AppData> + 'static) -> Self {
        Self {
            child: WidgetPod::new(child).boxed(),
            modal: None,
        }
    }
}

impl Widget<data::AppData> for ModalContainer {
    fn event(
        &mut self,
        ctx: &mut druid::EventCtx,
        event: &druid::Event,
        data: &mut data::AppData,
        env: &druid::Env,
    ) {
        if let druid::Event::Notification(n) = event {
            if n.is(crate::commands::CLOSE_MODAL) {
                self.modal = None;
                data.modals.rename_block = data::RenameBlock::default();
                ctx.children_changed();
                return;
            }
        }

        if let druid::Event::Command(c) = event {
            if let Some(idx) = c.get(crate::commands::RENAME_BLOCK) {
                data.modals.rename_block = data::RenameBlock {
                    name: data
                        .blocks
                        .get(*idx)
                        .map(|i| i.name.clone())
                        .unwrap_or_default(),
                    input: data
                        .blocks
                        .get(*idx)
                        .map(|i| i.name.clone())
                        .unwrap_or_default(),
                    block_index: *idx,
                };
                self.modal = Some(WidgetPod::new(rename_block()).boxed());
                ctx.children_changed();
                return;
            }
        }

        if let Some(m) = self.modal.as_mut() {
            m.event(ctx, event, data, env);
        } else {
            self.child.event(ctx, event, data, env);
        }
    }

    fn lifecycle(
        &mut self,
        ctx: &mut druid::LifeCycleCtx,
        event: &druid::LifeCycle,
        data: &data::AppData,
        env: &druid::Env,
    ) {
        if let Some(modal) = self.modal.as_mut() {
            modal.lifecycle(ctx, event, data, env);
        }
        self.child.lifecycle(ctx, event, data, env);
    }

    fn update(
        &mut self,
        ctx: &mut druid::UpdateCtx,
        _old_data: &data::AppData,
        data: &data::AppData,
        env: &druid::Env,
    ) {
        if let Some(modal) = self.modal.as_mut() {
            modal.update(ctx, data, env);
        }
        self.child.update(ctx, data, env);
    }

    fn layout(
        &mut self,
        ctx: &mut druid::LayoutCtx,
        bc: &druid::BoxConstraints,
        data: &data::AppData,
        env: &druid::Env,
    ) -> druid::Size {
        if let Some(modal) = self.modal.as_mut() {
            modal.layout(ctx, bc, data, env);
        }
        self.child.layout(ctx, bc, data, env)
    }

    fn paint(&mut self, ctx: &mut druid::PaintCtx, data: &data::AppData, env: &druid::Env) {
        self.child.paint(ctx, data, env);
        let full_rect = ctx.size().to_rect();
        if let Some(m) = self.modal.as_mut() {
            ctx.fill(full_rect, &druid::Color::rgba8(0, 0, 0, 100));
            m.paint(ctx, data, env)
        }
    }
}

fn rename_block() -> impl Widget<data::AppData> {
    modal_container(
        "Rename Block",
        (300.0, 150.0),
        Flex::column()
            .with_child(
                Label::new("Block name")
                    .with_text_color(druid::Color::WHITE)
                    .with_text_alignment(TextAlignment::Start)
                    .with_font(
                        FontDescriptor::new(FontFamily::SYSTEM_UI)
                            .with_weight(FontWeight::BOLD)
                            .with_size(14.0),
                    )
                    .fix_width(300.0),
            )
            .with_spacer(5.0)
            .with_child(LensWrap::new(
                LensWrap::new(
                    TextBox::default()
                        .lens(data::RenameBlock::input)
                        .fix_width(300.0),
                    data::Modals::rename_block,
                ),
                data::AppData::modals,
            ))
            .with_spacer(20.0)
            .with_child(
                Flex::row()
                    .must_fill_main_axis(true)
                    .with_child(modal_action("Cancel").on_click(|ctx, _, _| {
                        ctx.submit_notification(crate::commands::CLOSE_MODAL)
                    }))
                    .with_flex_spacer(1.0)
                    .with_child(modal_action("Rename").on_click(
                        |ctx, data: &mut data::AppData, _| {
                            let input = data.modals.rename_block.input.clone();
                            if let Some(blk) =
                                data.blocks.get_mut(data.modals.rename_block.block_index)
                            {
                                blk.name = input;
                                data.modals.rename_block = data::RenameBlock::default();
                                ctx.submit_notification(crate::commands::CLOSE_MODAL)
                            }
                        },
                    ))
                    .fix_width(300.0),
            ),
    )
}

fn modal_container<S: Into<druid::Size>>(
    title: &str,
    size: S,
    child: impl Widget<data::AppData> + 'static,
) -> impl Widget<data::AppData> {
    let size = size.into();
    Flex::column()
        .with_child(modal_title(title, size.width))
        .with_child(Padding::new(15.0, child))
        .background(Color::rgb8(20, 20, 20))
        .center()
        .fix_size(size.width, size.height)
}

fn modal_title(title: &str, width: f64) -> impl Widget<data::AppData> {
    Container::new(Padding::new(
        8.0,
        Flex::row()
            .with_spacer(10.0)
            .with_child(
                Label::new(title)
                    .with_text_color(Color::rgb8(150, 150, 150))
                    .with_text_alignment(TextAlignment::Start)
                    .with_font(
                        FontDescriptor::new(FontFamily::SYSTEM_UI)
                            .with_weight(FontWeight::BOLD)
                            .with_size(14.0),
                    )
                    .fix_width(width),
            )
            .with_spacer(10.0),
    ))
    .background(Color::rgb8(10, 10, 10))
}

fn modal_action<T: Data>(text: &str) -> impl Widget<T> {
    Container::new(Padding::new(5.0, Label::new(text)))
        .rounded(4.0)
        .controller(ModalActionController)
}

pub struct ModalActionController;

impl<T: Data> Controller<T, Container<T>> for ModalActionController {
    fn event(
        &mut self,
        child: &mut Container<T>,
        ctx: &mut druid::EventCtx,
        event: &druid::Event,
        data: &mut T,
        env: &druid::Env,
    ) {
        ctx.set_cursor(&druid::Cursor::Pointer);
        child.event(ctx, event, data, env)
    }

    fn lifecycle(
        &mut self,
        child: &mut Container<T>,
        ctx: &mut druid::LifeCycleCtx,
        event: &druid::LifeCycle,
        data: &T,
        env: &druid::Env,
    ) {
        match event {
            LifeCycle::HotChanged(true) => {
                child.set_background(Color::rgb8(100, 100, 100));
                ctx.request_paint();
            }
            LifeCycle::HotChanged(false) => {
                child.set_background(Color::TRANSPARENT);
                ctx.request_paint();
            }
            _ => {}
        }
        child.lifecycle(ctx, event, data, env)
    }

    fn update(
        &mut self,
        child: &mut Container<T>,
        ctx: &mut druid::UpdateCtx,
        old_data: &T,
        data: &T,
        env: &druid::Env,
    ) {
        child.update(ctx, old_data, data, env)
    }
}