// Logic simulation for the 74xx273 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 Logic74xx273 extends BaseComponent {
  private clock = false;
  private internalstate: boolean[];
  private d0 = true;
  private d1 = true;
  private d2 = true;
  private d3 = true;
  private d4 = true;
  private d5 = true;
  private d6 = true;
  private d7 = true;
  private cp = true;
  private mr = true;
  constructor(simulator: Simulator, id: string, param: BaseComponentParam) {
    super(simulator, id, param);
    this.pins.set('d0', new TriState(this, -40, -75));
    this.pins.set('d1', new TriState(this, -40, -60));
    this.pins.set('d2', new TriState(this, -40, -45));
    this.pins.set('d3', new TriState(this, -40, -30));
    this.pins.set('d4', new TriState(this, -40, -15));
    this.pins.set('d5', new TriState(this, -40, 0));
    this.pins.set('d6', new TriState(this, -40, 15));
    this.pins.set('d7', new TriState(this, -40, 30));
    this.pins.set('cp', new TriState(this, -40, 60));
    this.pins.set('mr', new TriState(this, -40, 75));

    this.pins.set('q0', new TriState(this, 40, -75));
    this.pins.set('q1', new TriState(this, 40, -60));
    this.pins.set('q2', new TriState(this, 40, -45));
    this.pins.set('q3', new TriState(this, 40, -30));
    this.pins.set('q4', new TriState(this, 40, -15));
    this.pins.set('q5', new TriState(this, 40, 0));
    this.pins.set('q6', new TriState(this, 40, 15));
    this.pins.set('q7', new TriState(this, 40, 30));

    this.internalstate = [];
    for (let i = 0; i < 8; ++i) {
      this.internalstate[i] = false;
    }
  }

  setup(canvas: SVGElement) {
    super.doSetup('logic74xx273', canvas);
  }

  io() {
    this.d0 = this.binary(this.getPin('d0').getAndReset(), true);
    this.d1 = this.binary(this.getPin('d1').getAndReset(), true);
    this.d2 = this.binary(this.getPin('d2').getAndReset(), true);
    this.d3 = this.binary(this.getPin('d3').getAndReset(), true);
    this.d4 = this.binary(this.getPin('d4').getAndReset(), true);
    this.d5 = this.binary(this.getPin('d5').getAndReset(), true);
    this.d6 = this.binary(this.getPin('d6').getAndReset(), true);
    this.d7 = this.binary(this.getPin('d7').getAndReset(), true);
    this.cp = this.binary(this.getPin('cp').getAndReset(), true);
    this.mr = this.binary(this.getPin('mr').getAndReset(), true);
  }

  update(): boolean {
    if (this.startdelay) {
      --this.startdelay;
      return false;
    }
    if (this.mr === false) {
      // reset
      for (let i = 0; i < 8; ++i) {
        this.internalstate[i] = false;
      }
    }
    let mod = false;
    if (this.cp && this.clock === false) {
      mod ||= this.internalstate[0] !== this.d0;
      this.internalstate[0] = this.d0;
      mod ||= this.internalstate[1] !== this.d1;
      this.internalstate[1] = this.d1;
      mod ||= this.internalstate[2] !== this.d2;
      this.internalstate[2] = this.d2;
      mod ||= this.internalstate[3] !== this.d3;
      this.internalstate[3] = this.d3;
      mod ||= this.internalstate[4] !== this.d4;
      this.internalstate[4] = this.d4;
      mod ||= this.internalstate[5] !== this.d5;
      this.internalstate[5] = this.d5;
      mod ||= this.internalstate[6] !== this.d6;
      this.internalstate[6] = this.d6;
      mod ||= this.internalstate[7] !== this.d7;
      this.internalstate[7] = this.d7;
    }
    this.getPin('q0').setBool(this.internalstate[0]);
    this.getPin('q1').setBool(this.internalstate[1]);
    this.getPin('q2').setBool(this.internalstate[2]);
    this.getPin('q3').setBool(this.internalstate[3]);
    this.getPin('q4').setBool(this.internalstate[4]);
    this.getPin('q5').setBool(this.internalstate[5]);
    this.getPin('q6').setBool(this.internalstate[6]);
    this.getPin('q7').setBool(this.internalstate[7]);
    this.clock = this.cp;
    return mod;
  }
}