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extern crate tui;
use tui::{Frame, Terminal};
use tui::backend::Backend;
use tui::layout::{Alignment, Rect};
use tui::style::{Color, Style};
use tui::text::{Span, Spans};
use tui::widgets::{Block, Borders, Paragraph};

use crate::userinterface::widgets::{BORDERS, EMPTY_SPACES};

const EXTRA_SPACES: u16 = 3;
const LARGER_ROW: u16 = 37;

pub const WIN_WIDTH: u16 = LARGER_ROW + (EMPTY_SPACES + EXTRA_SPACES) * 2
  + BORDERS;

const TEXT_HEIGHT: u16 = 3;

pub const WIN_HEIGHT: u16 = TEXT_HEIGHT + EMPTY_SPACES + BORDERS;

pub fn render<B: Backend>(terminal: &mut Terminal<B>, text_error: &String) {
  terminal.draw(|frame| {

    let frame_area = frame.size();

    let frame_left = frame_area.left();
    let frame_top = frame_area.top();
    let frame_width = frame_area.right() - frame_left;
    let frame_height = frame_area.bottom() - frame_top;

    let window_area = Rect::new(frame_left + frame_width/2 - WIN_WIDTH/2,
      frame_top + frame_height/2 - WIN_HEIGHT/2, WIN_WIDTH, WIN_HEIGHT);
    let window_left = window_area.left();
    let window_top = window_area.top();
    let window_width = window_area.right() - window_left;
    let window_height = window_area.bottom() - window_top;

    let text_area =
      Rect::new(window_left + 1, window_top + 1 + window_height/2 - BORDERS,
        window_width - BORDERS, window_height - BORDERS);

    render_borders(frame, &window_area);
    render_text(frame, &text_area, &text_error);

  }).unwrap();
}

fn render_borders<B: Backend>(frame: &mut Frame<B>, area: &Rect) {
  let block = Block::default().borders(Borders::ALL)
    .border_style(Style::default().fg(Color::Red));
  frame.render_widget(block, *area);
}

fn render_text<B: Backend>(frame: &mut Frame<B>, area: &Rect,
  text: &str) {

    let generate_text = vec![
      Spans::from(Span::styled(text, Style::default().fg(Color::Red))),
      Spans::from(Span::raw("")),
      Spans::from(Span::raw("< Enter > to exit")),
    ];

    let generate_paragraph =
      Paragraph::new(generate_text).alignment(Alignment::Center);

    frame.render_widget(generate_paragraph, *area);
}