use mlua::{IntoLua, UserData};
use ratatui::style::Color;

use crate::{config::{evalsto::EvalTo, GlobalConfig}, sheet::cell::CellRef};

use super::style::Style;

#[derive(Debug, Clone)]
pub struct SheetViewTheme {
    pub cursor: Style,
    pub selection: Style,
    pub cell: EvalTo<Style, CellRef>,
}

impl SheetViewTheme {
    pub const fn new() -> Self {
        Self {
            cursor: Style::new().fg(Color::Black).bg(Color::White),
            selection: Style::new().fg(Color::White).bg(Color::DarkGray),
            cell: EvalTo::Value(Style::new().fg(Color::White).bg(Color::Black)),
        }
    }
}

macro_rules! cfg {
    () => {
        GlobalConfig::instance().theme.sheetview
    };
}

macro_rules! cfg_mut {
    () => {
        GlobalConfig::instance_mut().theme.sheetview
    };
}

impl UserData for SheetViewTheme {
    fn add_fields<'lua, F: mlua::prelude::LuaUserDataFields<'lua, Self>>(fields: & mut F) {
        fields.add_field_function_get("cursor", |_, _| Ok(cfg!().cursor.clone()));

        fields.add_field_function_set("cursor", |_, _, pair: Style| {
            cfg_mut!().cursor = pair;
            Ok(())
        });

        fields.add_field_function_get("selection", |_, _| Ok(cfg!().selection.clone()));

        fields.add_field_function_set("selection", |_, _, pair: Style| {
            cfg_mut!().selection = pair;
            Ok(())
        });

        fields.add_field_function_get("cell", |lua, _| {
            Ok(cfg!().cell.clone().into_lua(lua)?)
        });

        fields.add_field_function_set("cell", |_, _, cell: EvalTo<Style, CellRef>| {
            cfg_mut!().cell = cell;
            Ok(())
        });
    }
}