// Logic source (toggle area) 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/>.

interface LogicSourceParam extends BaseComponentParam {
  tristate?: boolean;
  state?: boolean | null;
  floating?: string;
  attach?: string;
}

// eslint-disable-next-line @typescript-eslint/no-unused-vars
class LogicSource extends BaseComponent {
  private tristate: boolean;
  private pressed: number;
  private floating: WireState;
  private text: NodeList | null = null;
  private q = WireState.float;
  constructor(simulator: Simulator, id: string, param: LogicSourceParam) {
    super(simulator, id, param);
    this.tristate = param.tristate === undefined || param.tristate;
    if (this.tristate) {
      this.pressed = param.state !== undefined ? (param.state === null ? 0 : param.state === false ? 1 : 2) : 0;
    } else {
      this.pressed = param.state === true ? 2 : 1;
    }
    let x = 10;
    let y = 0;
    switch (param.attach) {
      case 'w':
        x = -10;
        y = 0;
    }

    this.floating = Wire.WireStateFromString(param.floating || 'down');
    this.pins.set('q', new TriState(this, x, y));
    this.update();
  }

  setup(canvas: SVGElement) {
    super.doSetup('logicsource', canvas);
    if (!this.element) return;
    this.text = this.element.querySelectorAll('.inner');
    this.text[0].textContent = this.pressed === 0 ? '-' : this.pressed === 1 ? '0' : '1';
    this.element.addEventListener('mousedown', this.activate.bind(this));
  }

  activate(e: MouseEvent) {
    e.preventDefault();
    if (this.tristate) {
      this.pressed = (this.pressed + 1) % 3;
    } else {
      this.pressed = this.pressed === 1 ? 2 : 1;
    }
    //document.text = this.text;
    if (this.text) {
      this.text[0].textContent = this.pressed === 0 ? '-' : this.pressed === 1 ? '0' : '1';
    }
    this.simulator.manualtick();
  }

  io() {
    this.getPin('q').getAndReset();
  }

  update(): boolean {
    const oldstate = this.q;
    this.q = this.pressed === 0 ? this.floating : this.pressed === 1 ? WireState.down : WireState.up;
    this.getPin('q').setState(this.q);
    return oldstate !== this.q;
  }
}