use crate::prelude::*;
use anyhow::Result;

use std::{any::Any, collections::HashMap, sync::Arc};

// simulate trait upcasting
pub trait TopLevelGui: Send + Sync {
    fn gui_traits(&self) -> &dyn GuiElementTraits;
    fn top_gui(&self) -> Option<&dyn TopGui>;
    fn elements(&self) -> Option<&HashMap<String, UiElement>>;
    fn functionality(&self) -> Option<&dyn Functionality>;
    fn enable(&self) -> Result<()>;
    fn disable(&self) -> Result<()>;
}

pub fn any_to<T>(any: &dyn Any) -> Result<&T>
where
    T: 'static,
{
    match any.downcast_ref::<T>() {
        Some(data) => Ok(data),
        None => Err(anyhow::Error::msg("Unable to downcast")),
    }
}

pub trait Functionality {
    fn set_click_callbacks(
        &self,
        callbacks: Vec<(&str, Box<dyn Fn() -> Result<()> + Send + Sync>)>,
    ) -> Result<()>;

    fn set_select_callbacks(
        &self,
        callbacks: Vec<(&str, Box<CustomCallback<bool, ()>>)>,
    ) -> Result<()>;

    fn set_custom_callbacks(
        &self,
        callbacks: Vec<(&str, Box<CustomCallback<ControllerButton, bool>>)>,
    ) -> Result<()>;

    fn set_vec_callbacks(
        &self,
        callbacks: Vec<(&str, Box<dyn Fn(&dyn Any) -> Result<()> + Send + Sync>)>,
    ) -> Result<()>;
}

pub trait GuiElementTraits: Send + Sync {
    fn gridable(&self) -> Option<&dyn Gridable>;
    fn visibility(&self) -> Option<&dyn Visibility>;
    fn downcast<'a>(&'a self) -> Option<GuiElement<'a>>;
}

pub trait Gridable {
    fn set_frame(
        &self,
        x: i32,
        y: i32,
        w: u32,
        h: u32,
        vert_align: VerticalAlign,
        hori_align: HorizontalAlign,
    ) -> Result<()>;

    fn selectable(&self) -> Option<&Arc<Selectable>>;

    fn type_name(&self) -> &str;

    fn set_layer(&self, layer: i32) -> Result<()>;

    fn position_extent(&self) -> (i32, i32, u32, u32);
}

pub trait Visibility {
    fn visible(&self) -> bool;
    fn set_visibility(&self, visibility: bool) -> Result<()>;
}

pub enum GuiElement<'a> {
    Button(&'a Button),
    Grid(&'a Grid),
    Label(&'a Label),
    MultiLineLabel(&'a MultiLineLabel),
    MultiLineTextField(&'a MultiLineTextField),
    TextField(&'a TextField),
    Icon(&'a Icon),
    ProgressBar(&'a ProgressBar),
    GuiSnippet(&'a GuiSnippet),
    GuiBuilder(&'a GuiBuilder),
    Custom(&'a dyn Any),
}

impl<'a> GuiElement<'a> {
    pub fn button(&self) -> Option<&Button> {
        match self {
            Self::Button(button) => Some(button),
            _ => None,
        }
    }

    pub fn grid(&self) -> Option<&Grid> {
        match self {
            Self::Grid(grid) => Some(grid),
            _ => None,
        }
    }

    pub fn label(&self) -> Option<&Label> {
        match self {
            Self::Label(label) => Some(label),
            _ => None,
        }
    }

    pub fn multi_line_label(&self) -> Option<&MultiLineLabel> {
        match self {
            Self::MultiLineLabel(multi_line_label) => Some(multi_line_label),
            _ => None,
        }
    }

    pub fn multi_line_text_field(&self) -> Option<&MultiLineTextField> {
        match self {
            Self::MultiLineTextField(multi_line_text_field) => Some(multi_line_text_field),
            _ => None,
        }
    }

    pub fn text_field(&self) -> Option<&TextField> {
        match self {
            Self::TextField(text_field) => Some(text_field),
            _ => None,
        }
    }

    pub fn icon(&self) -> Option<&Icon> {
        match self {
            Self::Icon(icon) => Some(icon),
            _ => None,
        }
    }

    pub fn progress_bar(&self) -> Option<&ProgressBar> {
        match self {
            Self::ProgressBar(progress_bar) => Some(progress_bar),
            _ => None,
        }
    }

    pub fn gui_snippet(&self) -> Option<&GuiSnippet> {
        match self {
            Self::GuiSnippet(gui_snippet) => Some(gui_snippet),
            _ => None,
        }
    }

    pub fn gui_builder(&self) -> Option<&GuiBuilder> {
        match self {
            Self::GuiBuilder(gui_builder) => Some(gui_builder),
            _ => None,
        }
    }
}