// Logic Rising Edge component for the LogicSimulator used on the 8-bit-Computer
// 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/>.

interface LogicRisingEdgeParam extends BaseComponentParam {
  delay?: number;
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
class LogicRisingEdge extends BaseComponent {
  private a = false;
  private olda = false;
  private q = false;
  private delay: number;
  private activeDelay = 0;
  constructor(simulator: Simulator, id: string, param: LogicRisingEdgeParam) {
    super(simulator, id, param);
    this.pins.set('a', new TriState(this, -30, 0));
    this.pins.set('q', new TriState(this, 30, 0));
    this.delay = param.delay || 0;
  }

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

  io() {
    this.a = this.binary(this.getPin('a').getAndReset(), true);
  }

  update(): boolean {
    const oldstate = this.q;
    if (this.olda === false && this.a === true) {
      this.activeDelay = this.delay;
    }
    this.q = this.activeDelay > 0;
    this.getPin('q').setBool(this.q);
    this.olda = this.a;
    if (this.activeDelay > 0) {
      this.activeDelay--;
    }
    return oldstate !== this.q || this.q === true;
  }
}