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

use assetpath::AssetPath;

use super::validator::{
    buttoninfo::NeighbourInfo,
    uiinfoelement::UiInfoElement,
    validator::{handle_function_suffix, Validator},
};
use crate::prelude::*;
use anyhow::Result;

pub struct GuiSnippet {
    grid: Arc<Grid>,

    ids: HashMap<String, UiElement>,
}

impl GuiSnippet {
    pub fn new(gui_handler: Arc<GuiHandler>, path: &AssetPath) -> Result<Arc<Self>> {
        let validator = Validator::new(
            #[cfg(feature = "audio")]
            &gui_handler,
            path,
        )?;

        let root = validator.root();

        let mut ids = HashMap::new();
        let mut custom_neighbours = Vec::new();

        if root.children.len() != 1 {
            return Err(anyhow::Error::msg(format!(
                "Expected exact 1 root in {}. Found {} roots",
                path.full_path(),
                root.children.len()
            )));
        }

        let grid_info = &root.children[0];
        let grid = Grid::try_from(grid_info, &gui_handler, false)?;

        GuiBuilder::insert_id(&mut ids, &grid_info.id, &grid)?;

        for child in grid_info.children.read().unwrap().iter() {
            Self::create_child(&gui_handler, child, &grid, &mut ids, &mut custom_neighbours)?;
        }

        GuiBuilder::connect_custom_neighbours(&ids, custom_neighbours)?;

        Ok(Arc::new(GuiSnippet { grid, ids }))
    }
}

macro_rules! impl_element {
    ($data_type:ident $(< $($lt:lifetime),+ >)?) => {
        impl GetElement<$data_type$(<$($lt,)+>)?> for GuiSnippet {
            fn element(&self, id: &str) -> Result<Arc<$data_type$(<$($lt,)+>)?>> {
                self.ids.element(id)
            }
        }
    };
}

impl_element!(Button);
impl_element!(Grid);
impl_element!(Label);
impl_element!(TextField);
impl_element!(Icon);
impl_element!(ProgressBar);
impl_element!(MultiLineLabel);
impl_element!(MultiLineTextField);

impl Visibility for GuiSnippet {
    fn visible(&self) -> bool {
        self.grid.visible()
    }

    fn set_visibility(&self, visibility: bool) -> Result<()> {
        self.grid.set_visibility(visibility)
    }
}

impl GuiElementTraits for GuiSnippet {
    fn gridable(&self) -> Option<&dyn Gridable> {
        Some(self)
    }

    fn visibility(&self) -> Option<&dyn Visibility> {
        Some(self)
    }

    fn downcast<'a>(&'a self) -> Option<GuiElement<'a>> {
        Some(GuiElement::GuiSnippet(self))
    }
}

impl Gridable for GuiSnippet {
    fn set_frame(
        &self,
        x: i32,
        y: i32,
        w: u32,
        h: u32,
        vert_align: VerticalAlign,
        hori_align: HorizontalAlign,
    ) -> Result<()> {
        self.grid.set_frame(x, y, w, h, vert_align, hori_align)
    }

    fn selectable(&self) -> Option<&Arc<Selectable>> {
        self.grid.selectable()
    }

    fn type_name(&self) -> &str {
        "GuiSnippet"
    }

    fn set_layer(&self, layer: i32) -> Result<()> {
        self.grid.set_layer(layer)
    }
}

impl Functionality for GuiSnippet {
    fn set_click_callbacks(
        &self,
        functions: Vec<(&str, Box<dyn Fn() -> Result<()> + Send + Sync>)>,
    ) -> Result<()> {
        for (function_name, callback) in functions {
            let suffix_less_function_name = handle_function_suffix(function_name);

            let button: Arc<Button> = self.element(&suffix_less_function_name)?;
            button.set_callback(callback);
        }

        Ok(())
    }

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

    fn set_select_callbacks(
        &self,
        callbacks: Vec<(&str, Box<CustomCallback<bool, ()>>)>,
    ) -> Result<()> {
        for (function_name, callback) in callbacks {
            let suffix_less_function_name = handle_function_suffix(function_name);

            let button: Arc<Button> = self.element(&suffix_less_function_name)?;
            button.set_select_callback(callback);
        }

        Ok(())
    }

    fn set_custom_callbacks(
        &self,
        callbacks: Vec<(&str, Box<CustomCallback<ControllerButton, bool>>)>,
    ) -> Result<()> {
        for (function_name, callback) in callbacks {
            let suffix_less_function_name = handle_function_suffix(function_name);

            let button: Arc<Button> = self.element(&suffix_less_function_name)?;
            button.set_custom_callback(callback);
        }

        Ok(())
    }
}

impl GuiSnippet {
    fn create_child(
        gui_handler: &Arc<GuiHandler>,
        child: &UiInfoElement,
        grid: &Grid,
        ids: &mut HashMap<String, UiElement>,
        neighbour_infos: &mut Vec<(String, Vec<NeighbourInfo>)>,
    ) -> Result<()> {
        match child {
            UiInfoElement::Button(button_info) => {
                let button = Button::try_from(button_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &button_info.id, &button)?;

                grid.attach(
                    button.clone(),
                    button_info.x_slot.get()?,
                    button_info.y_slot.get()?,
                    button_info.x_dim,
                    button_info.y_dim,
                )?;

                neighbour_infos.push((button_info.id.clone(), button_info.neighbour_infos.clone()));
            }
            UiInfoElement::Label(label_info) => {
                let label = Label::try_from(label_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &label_info.id, &label)?;

                grid.attach(
                    label,
                    label_info.x_slot.get()?,
                    label_info.y_slot.get()?,
                    label_info.x_dim,
                    label_info.y_dim,
                )?;
            }
            UiInfoElement::MultiLineLabel(multi_line_label_info) => {
                let multi_line_label =
                    MultiLineLabel::try_from(multi_line_label_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &multi_line_label_info.id, &multi_line_label)?;

                grid.attach(
                    multi_line_label,
                    multi_line_label_info.x_slot.get()?,
                    multi_line_label_info.y_slot.get()?,
                    multi_line_label_info.x_dim,
                    multi_line_label_info.y_dim,
                )?;
            }
            UiInfoElement::MultiLineTextField(multi_line_text_field_info) => {
                let multi_line_text_field =
                    MultiLineTextField::try_from(multi_line_text_field_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &multi_line_text_field_info.id, &multi_line_text_field)?;

                grid.attach(
                    multi_line_text_field,
                    multi_line_text_field_info.x_slot.get()?,
                    multi_line_text_field_info.y_slot.get()?,
                    multi_line_text_field_info.x_dim,
                    multi_line_text_field_info.y_dim,
                )?;
            }
            UiInfoElement::TextField(text_field_info) => {
                let text_field = TextField::try_from(text_field_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &text_field_info.id, &text_field)?;

                grid.attach(
                    text_field,
                    text_field_info.x_slot.get()?,
                    text_field_info.y_slot.get()?,
                    text_field_info.x_dim,
                    text_field_info.y_dim,
                )?;
            }
            UiInfoElement::Icon(icon_info) => {
                let icon = Icon::try_from(icon_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &icon_info.id, UiElement::Icon(Arc::downgrade(&icon)))?;

                grid.attach(
                    icon,
                    icon_info.x_slot.get()?,
                    icon_info.y_slot.get()?,
                    icon_info.x_dim,
                    icon_info.y_dim,
                )?;
            }
            UiInfoElement::ProgressBar(progress_bar_info) => {
                let progress_bar = ProgressBar::try_from(progress_bar_info, gui_handler)?;

                GuiBuilder::insert_id(ids, &progress_bar_info.id, &progress_bar)?;

                grid.attach(
                    progress_bar,
                    progress_bar_info.x_slot.get()?,
                    progress_bar_info.y_slot.get()?,
                    progress_bar_info.x_dim,
                    progress_bar_info.y_dim,
                )?;
            }
            UiInfoElement::Grid(grid_info) => {
                let sub_grid = Grid::try_from(grid_info, gui_handler, false)?;

                GuiBuilder::insert_id(ids, &grid_info.id, &sub_grid)?;

                grid.attach(
                    sub_grid.clone(),
                    grid_info.x_slot.get()?,
                    grid_info.y_slot.get()?,
                    grid_info.x_dim,
                    grid_info.y_dim,
                )?;

                for child in grid_info.children.read().unwrap().iter() {
                    Self::create_child(gui_handler, child, &sub_grid, ids, neighbour_infos)?;
                }
            }
        }

        Ok(())
    }
}