// Logic simulation for the 74xx244 IC for the LogicSimulator
// Copyright (C) 2022 Sascha Nitsch

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

// eslint-disable-next-line @typescript-eslint/no-unused-vars
class Logic74xx244 extends BaseComponent {
  private oe = false;
  private i0 = false;
  private i1 = false;
  private i2 = false;
  private i3 = false;
  private o0 = false;
  private o1 = false;
  private o2 = false;
  private o3 = false;
  constructor(simulator: Simulator, id: string, param: BaseComponentParam) {
    super(simulator, id, param);
    this.pins.set('oe', new TriState(this, -40, -45));
    this.pins.set('i0', new TriState(this, -40, -15));
    this.pins.set('i1', new TriState(this, -40, 0));
    this.pins.set('i2', new TriState(this, -40, 15));
    this.pins.set('i3', new TriState(this, -40, 30));
    this.pins.set('o0', new TriState(this, 40, -15));
    this.pins.set('o1', new TriState(this, 40, 0));
    this.pins.set('o2', new TriState(this, 40, 15));
    this.pins.set('o3', new TriState(this, 40, 30));
  }

  setup(canvas: SVGElement) {
    super.doSetup('logic74xx244', canvas);
  }

  io() {
    this.oe = this.binary(this.getPin('oe').getAndReset(), true);
    this.i0 = this.binary(this.getPin('i0').getAndReset(), true);
    this.i1 = this.binary(this.getPin('i1').getAndReset(), true);
    this.i2 = this.binary(this.getPin('i2').getAndReset(), true);
    this.i3 = this.binary(this.getPin('i3').getAndReset(), true);
    this.o0 = this.binary(this.getPin('o0').getAndReset(), true);
    this.o1 = this.binary(this.getPin('o1').getAndReset(), true);
    this.o2 = this.binary(this.getPin('o2').getAndReset(), true);
    this.o3 = this.binary(this.getPin('o3').getAndReset(), true);
  }

  update(): boolean {
    if (this.startdelay) {
      --this.startdelay;
      return false;
    }
    let mod = false;
    if (this.oe === false) {
      mod ||= this.i0 !== this.o0;
      this.getPin('o0').setBool(this.i0);
      mod ||= this.i1 !== this.o1;
      this.getPin('o1').setBool(this.i1);
      mod ||= this.i2 !== this.o2;
      this.getPin('o2').setBool(this.i2);
      mod ||= this.i3 !== this.o3;
      this.getPin('o3').setBool(this.i3);
    }
    return mod;
  }
}