use mlua::UserData;
use ratatui::style::Color;

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

use super::style::Style;

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

impl SheetViewTheme {
    pub const fn new() -> Self {
        Self {
            cursor: EvalTo::Value(Style::new().fg(Color::Black).bg(Color::White)),
            selection: EvalTo::Value(Style::new().fg(Color::White).bg(Color::DarkGray)),
            cell: EvalTo::Value(Style::new().fg(Color::White).bg(Color::Black)),
            background: EvalTo::Value(Style::new().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: EvalTo<Style, CellRef>| {
            cfg_mut!().cursor = pair;
            Ok(())
        });

        fields.add_field_function_get("selection", |_, _| Ok(cfg!().selection.clone()));
        fields.add_field_function_set("selection", |_, _, pair: EvalTo<Style, CellRef>| {
            cfg_mut!().selection = pair;
            Ok(())
        });

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

        fields.add_field_function_get("background", |_, _| Ok(cfg!().background.clone()));
        fields.add_field_function_set("background", |_, _, background: EvalTo<Style, ()>| {
            cfg_mut!().background = background;
            Ok(())
        });
    }
}