import { useState, useRef } from 'react';
import { DSP_DEFAULT_PARAMETERS, DSPTypes } from '../../types';
import Button from '../../components/Button/Button';
import Card from '../../components/Card/Card';
import ChoiceStepper from '../../components/ChoiceStepper/ChoiceStepper';
import ChoiceSelect from '../../components/ChoiceSelect/ChoiceSelect';

import './AddDspPage.css';

type DSPForm = {
  name: string;
  type: DSPTypes;
  ip: string;
  port: number;
  deviceId: number;
  demo: boolean;
};

const DSP_TYPES = Object.keys(DSP_DEFAULT_PARAMETERS) as DSPTypes[];

function isValidIPv4(value: string): boolean {
  const parts = value.trim().split('.');

  if (parts.length !== 4) return false;

  return parts.every((part) => {
    if (!/^\d+$/.test(part)) return false;

    const n = Number(part);

    return n >= 0 && n <= 255;
  });
}

function AddDSPForm({
  onCancel,
  onAdd,
}: {
  onCancel: () => void;
  onAdd: (params: DSPForm) => void;
}) {
  const [form, setForm] = useState<DSPForm>({
    name: '',
    type: 'DSP408',
    ip: DSP_DEFAULT_PARAMETERS['DSP408'].ip,
    port: DSP_DEFAULT_PARAMETERS['DSP408'].defaultPort,
    deviceId: DSP_DEFAULT_PARAMETERS['DSP408'].device_id,
    demo: false,
  });

  const lastValidIp = useRef(form.ip);

  const validIp = form.demo || isValidIPv4(form.ip);

  const canSubmit =
    form.name.trim().length > 0 &&
    validIp &&
    Number.isInteger(form.deviceId) &&
    form.deviceId >= 1 &&
    form.deviceId <= 255;

  function validateIp() {
    if (form.demo) return;

    const ip = form.ip.trim();

    if (isValidIPv4(ip)) {
      lastValidIp.current = ip;

      if (ip !== form.ip) {
        setForm((prev) => ({ ...prev, ip }));
      }

      return;
    }

    setForm((prev) => ({
      ...prev,
      ip: lastValidIp.current,
    }));
  }

  function submit() {
    if (!canSubmit) return;

    onAdd(form);
  }

  return (
    <Card className="add-dsp-form">
      <div className="add-dsp-form__header">
        <h1 className="add-dsp-form__title">Add DSP</h1>
        <p className="add-dsp-form__hint">Register a new device to control from this app.</p>
      </div>

      <div className="add-dsp-form__field">
        <label htmlFor="f-name">Name</label>
        <input
          id="f-name"
          placeholder="Main Room DSP"
          value={form.name}
          onChange={(e) => setForm({ ...form, name: e.target.value })}
        />
      </div>

      <div className="add-dsp-form__row">
        <div className="add-dsp-form__field">
          <label htmlFor="f-type">Model</label>
          <ChoiceSelect
            className=""
            id="f-type"
            value={form.type}
            options={DSP_TYPES}
            onChange={(type) => setForm({ ...form, type })}
          />
        </div>

        <div className="add-dsp-form__field">
          <label htmlFor="f-deviceid">Device ID</label>
          <ChoiceStepper
            id="f-deviceid"
            className="add-dsp-form__stepper"
            value={form.deviceId}
            min={1}
            max={255}
            formatLabel={(v) => String(v)}
            onChange={(deviceId) => setForm({ ...form, deviceId })}
          />
        </div>
      </div>

      <div className="add-dsp-form__row">
        <div className="add-dsp-form__field">
          <label htmlFor="f-ip">IP address</label>

          <input
            id="f-ip"
            className="mono"
            value={form.ip}
            disabled={form.demo}
            onChange={(e) =>
              setForm((prev) => ({
                ...prev,
                ip: e.target.value,
              }))
            }
            onBlur={validateIp}
            onKeyDown={(e) => {
              if (e.key === 'Enter') {
                e.preventDefault();
                validateIp();
                e.currentTarget.blur();
              }
            }}
          />
        </div>

        <div className="add-dsp-form__field">
          <label htmlFor="f-port">Port</label>
          <ChoiceStepper
            id="f-port"
            className="add-dsp-form__stepper"
            value={form.port}
            min={1}
            max={65535}
            disabled={form.demo}
            formatLabel={(v) => String(v)}
            onChange={(port) => setForm({ ...form, port })}
          />
        </div>
      </div>

      <div className="add-dsp-form__field add-dsp-form__field--checkbox">
        <label htmlFor="f-demo" className="add-dsp-form__checkbox-label">
          <input
            id="f-demo"
            type="checkbox"
            checked={form.demo}
            onChange={(e) => {
              const demo = e.target.checked;

              setForm({ ...form, demo });
            }}
          />
          Demo mode (simulate device, no network connection)
        </label>
      </div>

      <div className="add-dsp-form__actions">
        <Button variant="ghost" onClick={onCancel}>
          Cancel
        </Button>

        <Button variant="primary" onClick={submit} disabled={!canSubmit}>
          Add DSP
        </Button>
      </div>
    </Card>
  );
}

export default AddDSPForm;