// Pull-Up or Pull-Down component 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 Pull extends BaseComponent {
  private a = WireState.float;
  private b = WireState.float;
  constructor(simulator: Simulator, id: string, param: BaseComponentParam) {
    super(simulator, id, param);
    const r = (this.rotate / 180) * Math.PI;
    this.pins.set('a', new TriState(this, 0, 0, undefined, { id: id + '-a' }));
    this.pins.set(
      'b',
      new TriState(this, Math.sin(r) * -40 * this.scaleX, Math.cos(r) * 40 * this.scaleY, undefined, {
        type: 'Pull',
        id: id + '-b',
      })
    );
  }

  setup(canvas: SVGElement) {
    super.doSetup('pull', canvas);
    if (this.breadboard) {
      this.simulator.wire(null, [this.getPin('a'), this.breadboard.getPin(this.pin)]);
    }
  }

  io() {
    this.a = this.getPin('a').getAndReset();
    this.b = this.getPin('b').getAndReset();
  }

  update() {
    let mod = false;
    let s: WireState;
    if (this.b === WireState.high || this.b === WireState.low) {
      // up, down driven by b
      s = this.b === WireState.high ? WireState.up : WireState.down;
      mod ||= s !== this.a;
      this.getPin('a').setState(s);
      this.getPin('b').setState(WireState.float);
    } else if (this.a === WireState.high || this.a === WireState.low) {
      // up, down driven by a
      s = this.a === WireState.high ? WireState.up : this.a === WireState.low ? WireState.down : this.a;
      this.getPin('b').setState(s);
      mod ||= s !== this.b;
      this.getPin('a').setState(WireState.float);
    } else if (this.b !== WireState.float) {
      // b is pushed up or pulled down
      s = this.b === WireState.up ? WireState.up : WireState.down;
      mod ||= s !== this.a;
      this.getPin('a').setState(s);
    } else if (this.a !== WireState.float) {
      // s is pushed up or pulled down
      s = this.a === WireState.up ? WireState.up : WireState.down;
      mod ||= s !== <WireState>this.b;
      this.getPin('b').setState(s);
    }
    //console.log(this.id,"a:",this.state.a, "b:",this.state.b, "new a:", this.a.get(), "new b:", this.b.get());
    return mod;
  }
}