// The device sheet (plan §7.1): the settings of the selected device, the
// fields of FILIUS' settings panel of its kind (JHostKonfiguration,
// JSwitchKonfiguration, JModemKonfiguration; a router's and a home router's
// in RouterSheets.tsx) in the panels' order. Java shows the panel when a
// device is chosen; so does the sheet, beside the surface or below it on a
// phone. Each change is one step of the person's undo.

import { useEffect, useState } from 'react';
import type * as Y from 'yjs';
import {
  deviceSheet,
  setDhcpClient,
  setHostAddress,
  setHostLabels,
  setHostWireless,
  setIpForwarding,
  setModemPort,
  setSwitchCloud,
  setSwitchRetention,
  setSwitchSsid,
  type CheckedField,
  type DeviceSheet as Sheet,
  type HostSheet,
  type ModemSheet,
  type SwitchSheet,
  type WirelessError,
} from '@mdg-filius/doc';
import { iconOf } from '../canvas/layout.js';
import { ICON_URLS } from '../canvas/icons.js';
import { useTranslate } from '../i18n/i18n.js';
import { NameField, type Change } from './NameField.js';
import { HomeRouterFields, RouterFields } from './RouterSheets.js';
import { DhcpServerPanel, PortForwardingPanel } from './ServicePanels.js';
import { SheetCheck, SheetField } from './SheetField.js';
import './sheet.css';

/** The device's sheet, read anew after every change of the document. */
function useDeviceSheet(doc: Y.Doc, id: string): Sheet | undefined {
  const [sheet, setSheet] = useState(() => deviceSheet(doc, id));
  useEffect(() => {
    setSheet(deviceSheet(doc, id));
    const update = () => setSheet(deviceSheet(doc, id));
    doc.on('update', update);
    return () => doc.off('update', update);
  }, [doc, id]);
  return sheet;
}

export interface DeviceSheetProps {
  readonly doc: Y.Doc;
  readonly id: string;
  /** What the surface writes under the icon (a host's address or MAC address, when it shows them). */
  readonly label: string;
  readonly origin: object;
  /** After each change: ends the undo step. */
  readonly onChanged: () => void;
  readonly onMessage: (message: string) => void;
  readonly onClose: () => void;
  /** The cable to draw active (a router's card whose tab is open), or none. */
  readonly onHighlight: (link: string | null) => void;
}

/** A page of the sheet that Java opens as a dialog. */
export type SheetPage = 'dhcp' | 'forwarding';

export function DeviceSheet({ doc, id, label, origin, onChanged, onMessage, onClose, onHighlight }: DeviceSheetProps) {
  const t = useTranslate();
  const sheet = useDeviceSheet(doc, id);
  // The page open, if any; the editor makes a sheet per device, so another device starts at its fields.
  const [open, setOpen] = useState<SheetPage | null>(null);
  if (sheet === undefined) return null;
  const onOpen = (each: SheetPage) => setOpen(each);
  const change: Change = {
    doc,
    id,
    origin,
    run: (each) => {
      const result = each();
      onChanged();
      return result;
    },
  };
  const title = t(`device.${sheet.kind}`);
  return (
    <aside className="device-sheet" aria-label={t('sheet.title')} data-device={id}>
      <header>
        {open === null ? (
          <img src={ICON_URLS[iconOf(sheet.kind, sheet.kind === 'networkSwitch' && sheet.cloud)]} alt="" />
        ) : (
          <button type="button" className="sheet-close" onClick={() => setOpen(null)} aria-label={t('sheet.back')} title={t('sheet.back')}>
            ‹
          </button>
        )}
        <h2>{open === 'dhcp' ? t('sheet.dhcpServer') : open === 'forwarding' ? t('sheet.portForwarding') : title}</h2>
        <button type="button" className="sheet-close" onClick={onClose} aria-label={t('sheet.close')} title={t('sheet.close')}>
          ×
        </button>
      </header>
      {/* A field per device: a text typed for one device is not offered to the next. Kept while a page is open, so that its tab stays as Java's panel does behind a dialog. */}
      <div key={id} hidden={open !== null}>
        {sheet.kind === 'pc' || sheet.kind === 'notebook' ? (
          <HostFields sheet={sheet} label={label} change={change} onMessage={onMessage} onOpen={onOpen} />
        ) : sheet.kind === 'networkSwitch' ? (
          <SwitchFields sheet={sheet} change={change} />
        ) : sheet.kind === 'remoteLink' ? (
          <ModemFields sheet={sheet} change={change} />
        ) : sheet.kind === 'router' ? (
          <RouterFields sheet={sheet} change={change} onHighlight={onHighlight} />
        ) : sheet.kind === 'gateway' ? (
          <HomeRouterFields sheet={sheet} change={change} onHighlight={onHighlight} onOpen={onOpen} />
        ) : (
          <NameField name={sheet.name} change={change} />
        )}
      </div>
      {open === 'dhcp' && (sheet.kind === 'pc' || sheet.kind === 'notebook' || sheet.kind === 'gateway') ? (
        <div key={`${id}-dhcp`}>
          <DhcpServerPanel server={sheet.dhcpServer} change={change} />
        </div>
      ) : open === 'forwarding' && sheet.kind === 'gateway' ? (
        <div key={`${id}-forwarding`}>
          <PortForwardingPanel sheet={sheet} change={change} />
        </div>
      ) : null}
    </aside>
  );
}

function HostFields({
  sheet,
  label,
  change,
  onMessage,
  onOpen,
}: {
  readonly sheet: HostSheet;
  readonly label: string;
  readonly change: Change;
  readonly onMessage: (message: string) => void;
  readonly onOpen: (page: SheetPage) => void;
}) {
  const t = useTranslate();
  const address =
    (field: 'ipAddress' | 'subnetMask' | 'defaultGateway' | 'dnsServer') =>
    (text: string): CheckedField =>
      change.run(() => setHostAddress(change.doc, change.id, field, text, change.origin));
  // Java's list offers the switches' networks; an SSID none of them has shows as "please choose" (JHostKonfiguration.updateSsid).
  const chosen = sheet.networks.includes(sheet.ssid) ? sheet.ssid : '';
  const wireless = (on: boolean, ssid: string) => {
    const result = change.run(() => setHostWireless(change.doc, change.id, on, ssid, crypto.randomUUID(), change.origin));
    if ('error' in result) onMessage(wirelessMessage(t, result.error));
  };
  const labelled = sheet.labels.ipAddress || sheet.labels.macAddress;
  return (
    <>
      {/* Java's name field shows what the surface writes, and is closed while that is the address. */}
      <NameField name={sheet.name} shown={labelled ? label : sheet.name} disabled={labelled} change={change} />
      <SheetField name="macAddress" label={t('sheet.macAddress')} value={sheet.macAddress} rule="name" readOnly onCommit={() => ({ invalid: true })} />
      <SheetField name="ipAddress" label={t('sheet.ipAddress')} value={sheet.ipAddress} rule="ipAddress" inputMode="decimal" disabled={sheet.dhcpClient} onCommit={address('ipAddress')} />
      <SheetField name="subnetMask" label={t('sheet.subnetMask')} value={sheet.subnetMask} rule="subnetMask" inputMode="decimal" disabled={sheet.dhcpClient} onCommit={address('subnetMask')} />
      <SheetField
        name="defaultGateway"
        label={t('sheet.defaultGateway')}
        value={sheet.defaultGateway}
        rule="ipAddressOrEmpty"
        inputMode="decimal"
        disabled={sheet.dhcpClient}
        onCommit={address('defaultGateway')}
      />
      <SheetField name="dnsServer" label={t('sheet.dnsServer')} value={sheet.dnsServer} rule="ipAddressOrEmpty" inputMode="decimal" disabled={sheet.dhcpClient} onCommit={address('dnsServer')} />
      <fieldset className="sheet-group" role="radiogroup" aria-label={t('sheet.connection')}>
        <label className="sheet-check">
          <input type="radio" name="connection" value="cable" checked={!sheet.wireless} onChange={() => wireless(false, chosen)} />
          {t('sheet.cable')}
        </label>
        <label className={sheet.wirelessPossible ? 'sheet-check' : 'sheet-check disabled'}>
          <input type="radio" name="connection" value="wireless" checked={sheet.wireless} disabled={!sheet.wirelessPossible} onChange={() => wireless(true, chosen)} />
          {t('sheet.wireless')}
        </label>
      </fieldset>
      <label className="sheet-field">
        <span>{t('sheet.network')}</span>
        <select name="ssid" value={chosen} disabled={!sheet.wireless} onChange={(event) => wireless(sheet.wireless, event.target.value)}>
          <option value="">{t('sheet.chooseNetwork')}</option>
          {sheet.networks.map((network) => (
            <option key={network} value={network}>
              {network}
            </option>
          ))}
        </select>
      </label>
      <SheetCheck
        name="ipAsName"
        label={t('sheet.ipAsName')}
        checked={sheet.labels.ipAddress}
        onChange={(on) => change.run(() => setHostLabels(change.doc, change.id, { ...sheet.labels, ipAddress: on }, change.origin))}
      />
      <SheetCheck
        name="macAsName"
        label={t('sheet.macAsName')}
        checked={sheet.labels.macAddress}
        onChange={(on) => change.run(() => setHostLabels(change.doc, change.id, { ...sheet.labels, macAddress: on }, change.origin))}
      />
      <SheetCheck name="ipForwarding" label={t('sheet.ipForwarding')} checked={sheet.ipForwarding} onChange={(on) => change.run(() => setIpForwarding(change.doc, change.id, on, change.origin))} />
      <SheetCheck name="dhcpClient" label={t('sheet.dhcpClient')} checked={sheet.dhcpClient} onChange={(on) => change.run(() => setDhcpClient(change.doc, change.id, on, change.origin))} />
      {/* Java closes the server's dialog while DHCP configures the card. */}
      <div className="sheet-buttons">
        <button type="button" disabled={sheet.dhcpClient} onClick={() => onOpen('dhcp')}>
          {t('sheet.dhcpServer')}
        </button>
      </div>
    </>
  );
}

function wirelessMessage(t: ReturnType<typeof useTranslate>, error: WirelessError): string {
  return error === 'cablePlugged' ? t('sheet.cablePlugged') : t(`cable.${error}`);
}

function SwitchFields({ sheet, change }: { readonly sheet: SwitchSheet; readonly change: Change }) {
  const t = useTranslate();
  return (
    <>
      <NameField name={sheet.name} change={change} />
      <SheetField name="ssid" label={t('sheet.switchSsid')} value={sheet.ssid} rule="ssid" onCommit={(text) => change.run(() => setSwitchSsid(change.doc, change.id, text, change.origin))} />
      <SheetCheck name="cloud" label={t('sheet.cloud')} checked={sheet.cloud} onChange={(on) => change.run(() => setSwitchCloud(change.doc, change.id, on, change.origin))} />
      <SheetField
        name="retention"
        label={t('sheet.retention')}
        value={String(sheet.retentionSeconds)}
        rule="seconds"
        inputMode="numeric"
        onCommit={(text) => change.run(() => setSwitchRetention(change.doc, change.id, text, change.origin))}
      />
    </>
  );
}

function ModemFields({ sheet, change }: { readonly sheet: ModemSheet; readonly change: Change }) {
  const t = useTranslate();
  return (
    <>
      <NameField name={sheet.name} change={change} />
      <SheetField
        name="port"
        label={t('sheet.port')}
        value={String(sheet.port)}
        rule="port"
        inputMode="numeric"
        onCommit={(text) => change.run(() => setModemPort(change.doc, change.id, text, change.origin))}
      />
    </>
  );
}