#include "textwindow.h"
#include "cga.h"

TextWindow::TextWindow(unsigned from_col, unsigned to_col, unsigned from_row,
                       unsigned to_row, bool use_cursor) {
  this->from_col = from_col;
  this->to_col = to_col;
  this->from_row = from_row;
  this->to_row = to_row;
  this->use_cursor = use_cursor;
}

void TextWindow::setPos(unsigned rel_x, unsigned rel_y) {
    if(use_cursor){
        CGA::setCursor(from_col + rel_x, from_row + rel_y);
    }else{
        pos_x = from_col + rel_x;
        pos_y = from_row + rel_y;
    }
}

void TextWindow::getPos(unsigned& rel_x, unsigned& rel_y) const {
    if(use_cursor){
        CGA::getCursor(rel_x, rel_y);
        rel_x -= from_col;
        rel_y -= from_row;
    }
    else {
        rel_x = pos_x - from_col;
        rel_y = pos_y - from_row;
    }
}

void TextWindow::setPos(int rel_x, int rel_y) {
    if(rel_x < 0)
        rel_x = to_col - from_col + rel_x;
    if(rel_y < 0)
        rel_y = to_row - from_row + rel_y;

    setPos((unsigned) rel_x, (unsigned) rel_y);
}

void TextWindow::getPos(int& rel_x, int& rel_y) const {
    unsigned x, y;
    getPos(x,y);
    rel_x = x;
    rel_y = y;
}

void TextWindow::print(const char* str, size_t length, CGA::Attribute attrib) {
    for(unsigned i=0; i<length; i++){
        unsigned x_now, y_now;
        getPos(x_now, y_now);
        if(str[i] == '\n'){
            x_now = 0;
            if(from_row + y_now >= to_row-1){
                //TODO scrollUp()
            }
            else{
                y_now++;
            }
            setPos(x_now, y_now);
            return;
        }

        CGA::show(x_now, y_now, str[i], attrib);
        if(from_col+x_now >= to_col-1){
            x_now = 0;
            if(from_row + y_now >= to_row-1){
                //TODO scrollUp()
            }
            else{
                y_now++;
            }
        }
        else {
            x_now++;
        }
        setPos(x_now, y_now);
    }
}

void TextWindow::reset(char character, CGA::Attribute attrib) {
    for(unsigned i=from_row; i<to_row; i++)
        for(unsigned j=from_col; j<to_col; j++)
            CGA::show(j, i, character, attrib);
    setPos(0, 0);
}