use macroquad::prelude::*;
use crate::parts::address_bus::AddressBus;
use crate::parts::data_bus::DataBus;

pub struct DisplayMatrix {
    width: f32,
    height: f32,
    text_buffer: String,
    data_bus: DataBus,
    rs: bool,
    rw: bool,
    cursor_position: u8
}

impl DisplayMatrix {
    pub fn new(width: f32, height: f32) -> DisplayMatrix {
        DisplayMatrix {
            width,
            height,
            text_buffer: String::from(""),
            data_bus: DataBus::new(),
            rs: false,
            rw: false,
            cursor_position: 0x00
        }
    }

    /// Tick
    ///
    /// Checks the data bus and sees what the setup is.
    ///
    /// 0 0 0 0 0 0 0 1 -> Clear Display
    /// 0 0 0 0 0 0 1 - -> Return Home
    /// 0 0 0 0 0 0 A B -> Sets cursor move direction and shift
    ///                    A -> 0 = Insert, 1 = Delete
    ///                    B -> Scroll bool
    /// 0 0 0 0 1 D C B -> Sets display mode
    ///                    D -> Display On/Off
    ///                    C -> Cursor On/Off
    ///                    B -> Blink
    pub fn tick(&mut self) {
        // parse whats on the data bus.

    }

    pub fn set_busses(&mut self, address_bus: &mut AddressBus, data_bus: &mut DataBus) {

    }

    pub fn push_letter(&mut self, letter_to_push: char) {
        self.cursor_position += 1;
        self.text_buffer.push(letter_to_push)
    }

    pub fn clear_display(&mut self) {
        self.cursor_position = 0;
        self.text_buffer.clear()
    }

    pub fn render(&self, x_offset: f32, y_offset: f32) {
        DisplayMatrix::draw_square(x_offset,
                                   y_offset,
                                   x_offset + self.width ,
                                   y_offset + self.height,
                                   BLACK);

        let mut tmp = self.text_buffer.clone();
        tmp.push('#');
        draw_text(&*tmp, x_offset + 5.0, y_offset + 20.0, 20.0, BLACK);
    }

    fn draw_square(x1: f32, y1: f32, x2: f32, y2: f32, color: Color) {
        // println!("Square from {x1:2.0}x{y1:2.0} to {x2:2.0}x{y2:2.0} with {:?}", color);
        draw_line(x1, y1, x2, y1, 1.0, color);
        draw_line(x1, y1, x1, y2, 1.0, color);
        draw_line(x1, y2, x2, y2, 1.0, color);
        draw_line(x2, y1, x2, y2, 1.0, color);
    }
}