// Writes `projekt/konfiguration.xml` from Java's view of a project — the
// counterpart of topology.ts and, for the system software, of
// systemSoftware.ts. The four values Java's netzwerkLaden reads: the
// version line, the list of GUIKnotenItem, of GUIKabelItem and of
// GUIDocuItem. What a node's constructor makes (its interfaces, a switch's
// ports) is reached through getters and changed there, as XMLEncoder does;
// what the constructor does not make is added. Cable ends name the port
// objects of the nodes, so the same cable joins the same ports when Java
// loads the file.
//
// The system software is the one the node's constructor makes; its settings
// are set through getters. A router's or home router's firewall is reached
// the way XMLEncoder reaches it: through the web server's `konfig` plug-in,
// which holds the same object (its key among the installed applications
// differs: Firewall on a router, NatGateway on a home router). Files are
// added to the constructor's root, as XMLEncoder adds them — on a router
// after the files its constructor makes. The installed applications of a PC
// or notebook follow the files, as in Java's own files: the constructors of
// the web server, the peer-to-peer application and the e-mail server make
// their directories only where the files lack them, and the DNS server reads
// /dns/hosts when it is installed. Each is put under its key and given the
// system software, as installApp does. A project's own application is
// written as the file had it (beanCapture.ts).
//
// E-mail: the server's domain and bean accounts with their mailboxes, the
// client's three folders and address book. The client's account is no bean
// (FILIUS 2.14 has no kontoListe property): it lives in /konten.txt, a file.
// Java's errors are not copied: a recipient an older file keeps as a string
// is written as the AddressEntry Java's own AddressEntry(String) makes of it
// — Java puts the string into the typed list unchecked, and its e-mail
// window fails on it; a null recipient is left out.
//
// Checked by Java: every corpus file, read and written again, loads in Java
// FILIUS to the same topology and system software (topologyWriter.test.ts,
// tools/java-oracle).

import { withSystemSoftware } from './beanCapture.js';
import {
  encodeJavaBeans,
  int,
  long,
  object,
  reference,
  type BeanObject,
  type BeanReference,
  type BeanStatement,
  type BeanValue,
  short,
} from './javaBeansWriter.js';
import { addressEntry, type JavaAddressEntry, type JavaContact, type JavaEmail, type JavaEmailAccount, type JavaRecipient } from './javaEmail.js';
import { forwardsByDefault, type FlsApplication, type FlsFileTree, type FlsFirewall, type FlsSystemSoftware } from './systemSoftware.js';
import type { FlsDocumentationItem, FlsInterface, FlsLink, FlsNode, FlsNodeClass } from './topology.js';

/** The version line of the files this writer makes: the format of FILIUS 2.14. */
export const WRITTEN_VERSION_LINE = 'Filius version: 2.14.0 (mdg-filius)';

/**
 * An installed application with its settings. The e-mail accounts Java reads
 * from files (/mailserver/konten.txt, /konten.txt) are written with the
 * files; an older file's kontoListe, which FILIUS 2.14 does not read, is not
 * written.
 */
export type ApplicationToWrite = Omit<FlsApplication, 'source' | 'fileAccounts' | 'fileAccount' | 'legacyAccounts'>;

/** The system software's settings, files and applications. */
export type SystemToWrite = Omit<FlsSystemSoftware, 'applications'> & {
  readonly applications?: readonly ApplicationToWrite[];
};

export type NodeToWrite = Pick<
  FlsNode,
  'javaClass' | 'name' | 'x' | 'y' | 'useIpAsName' | 'useMacAsName' | 'interfaces' | 'portCount'
> & { readonly system: SystemToWrite; readonly cloud?: boolean };

export interface TopologyToWrite {
  readonly nodes: readonly NodeToWrite[];
  readonly links: readonly FlsLink[];
  readonly documentation: readonly FlsDocumentationItem[];
}

/** What each device class's constructor makes, and whether it is a host. */
const CONSTRUCTED: Record<FlsNodeClass, { count: number; local: boolean; host: boolean }> = {
  Rechner: { count: 1, local: false, host: true },
  Notebook: { count: 1, local: false, host: true },
  Vermittlungsrechner: { count: 1, local: false, host: false },
  Gateway: { count: 2, local: false, host: false },
  Switch: { count: 24, local: true, host: false },
  Modem: { count: 1, local: true, host: false },
};

export function writeTopologyXml(topology: TopologyToWrite): string {
  return encodeJavaBeans(topologyBeans(topology));
}

export function topologyBeans(topology: TopologyToWrite): BeanValue[] {
  const ports: BeanValue[][] = [];
  const items = topology.nodes.map((node, index) => {
    const nodePorts: BeanValue[] = [];
    ports[index] = nodePorts;
    return nodeItem(node, nodePorts);
  });
  const cables = topology.links.map((link) => cableItem(link, items, ports));
  return [
    WRITTEN_VERSION_LINE,
    listOf(items),
    listOf(cables),
    listOf(topology.documentation.map(documentationItem)),
  ];
}

function listOf(values: readonly BeanValue[]): BeanObject {
  return object(
    'java.util.LinkedList',
    values.map((value) => ({ call: 'add', args: [value] })),
  );
}

/**
 * A GUIKnotenItem: its label (the position) and its device; `ports`
 * receives the device's port objects. The label's size is Java's to work
 * out when it loads the file; the written 0 × 0 does not move it (measured
 * on the corpus).
 */
function nodeItem(node: NodeToWrite, ports: BeanValue[]): BeanObject {
  const label = object('filius.gui.netzwerksicht.JSidebarButton', [
    { set: 'bounds', value: object('java.awt.Rectangle', [], [int(node.x), int(node.y), int(0), int(0)]) },
  ]);
  return object('filius.gui.netzwerksicht.GUIKnotenItem', [
    { set: 'imageLabel', value: label },
    { set: 'knoten', value: device(node, ports) },
  ]);
}

function device(node: NodeToWrite, ports: BeanValue[]): BeanObject {
  const constructed = CONSTRUCTED[node.javaClass];
  // A switch drawn as a cloud: written only when true, before the name, as XMLEncoder orders Switch's properties.
  const statements: BeanStatement[] = [...(node.cloud === true ? [{ set: 'cloud', value: true }] : []), { set: 'name', value: node.name }];
  if (constructed.host) {
    statements.push({ set: 'useIPAsName', value: node.useIpAsName }, { set: 'useMACAsName', value: node.useMacAsName });
  }
  if (constructed.local) {
    statements.push(
      constructedList('anschluesse', node.portCount, constructed.count, ports, () => ({ statements: [] }), () => {
        const port = object('filius.hardware.Port');
        return { value: port, port };
      }),
    );
  } else {
    statements.push(
      constructedList(
        'netzwerkInterfaces',
        node.interfaces.length,
        constructed.count,
        ports,
        (index) => {
          const port = reference('Port');
          return { statements: [...interfaceStatements(node.interfaces[index]!), { get: 'port', statements: [], as: port }], port };
        },
        (index) => {
          const port = reference('Port');
          const nic = object('filius.hardware.NetzwerkInterface', [
            ...interfaceStatements(node.interfaces[index]!),
            { get: 'port', statements: [], as: port },
          ]);
          return { value: nic, port };
        },
      ),
    );
  }
  // Named for the applications, which are given it.
  const applicationCount = (node.system.applications?.length ?? 0) + (node.system.ownApplications?.length ?? 0);
  const system = applicationCount > 0 ? reference('SystemSoftware') : undefined;
  const systemStatementList = systemStatements(node.system, node.javaClass, system);
  statements.push(
    system === undefined
      ? { get: 'systemSoftware', statements: systemStatementList }
      : { get: 'systemSoftware', statements: systemStatementList, as: system },
  );
  return object(`filius.hardware.knoten.${node.javaClass}`, statements);
}

const WEB_SERVER_CLASS = 'filius.software.www.WebServer';

/**
 * The settings the file has, each set on the constructor's system software.
 * A switch's SSID the file lacked stays unwritten, so Java rolls one as it did.
 */
function systemStatements(system: SystemToWrite, javaClass: FlsNodeClass, self: BeanReference | undefined): BeanStatement[] {
  const statements: BeanStatement[] = [];
  if (system.firewall !== undefined) {
    statements.push({
      get: 'installierteAnwendungen',
      statements: [
        {
          call: 'get',
          args: [WEB_SERVER_CLASS],
          statements: [
            { get: 'plugins', statements: [{ call: 'get', args: ['konfig'], statements: [{ get: 'firewall', statements: firewallStatements(system.firewall) }] }] },
          ],
        },
      ],
    });
  }
  if (system.fileSystem !== undefined) statements.push(fileSystemStatement(system.fileSystem, system.templateFiles !== false));
  if (self !== undefined) {
    statements.push({
      get: 'installierteAnwendungen',
      statements: [
        ...(system.applications ?? []).map((application): BeanStatement => ({
          call: 'put',
          args: [application.key, object(application.javaClass, applicationStatements(application, self))],
        })),
        // A project's own: its bean as the file had it, on this node's system software.
        ...(system.ownApplications ?? []).map((application): BeanStatement => ({
          call: 'put',
          args: [application.key, withSystemSoftware(application.bean, self)],
        })),
      ],
    });
  }
  if (system.dhcpServer !== undefined) {
    const server = system.dhcpServer;
    statements.push({
      get: 'DHCPServer',
      statements: [
        { set: 'aktiv', value: server.isActive },
        { set: 'untergrenze', value: server.lowerBound },
        { set: 'obergrenze', value: server.upperBound },
        { set: 'gatewayip', value: server.gateway },
        { set: 'dnsserverip', value: server.dnsServer },
        { set: 'ownSettings', value: server.useOwnSettings },
        {
          set: 'staticAssignedAddresses',
          value: object(
            'java.util.ArrayList',
            server.staticAssignedAddresses.map(({ mac, ip }) => ({ call: 'add', args: [`${mac} ${ip}`] })),
          ),
        },
      ],
    });
  }
  if (system.dhcpClient !== undefined) statements.push({ set: 'DHCPKonfiguration', value: system.dhcpClient });
  // Written only where it differs from what Java's constructor sets, as XMLEncoder does.
  if (system.ipForwardingEnabled !== undefined && system.ipForwardingEnabled !== forwardsByDefault(javaClass)) {
    statements.push({ set: 'ipForwardingEnabled', value: system.ipForwardingEnabled });
  }
  if (system.manualRoutes !== undefined) {
    statements.push({ get: 'weiterleitungstabelle', statements: [{ set: 'manuelleTabelle', value: rows(system.manualRoutes) }] });
  }
  if (system.ripEnabled !== undefined) statements.push({ set: 'ripEnabled', value: system.ripEnabled });
  if (system.retentionTime !== undefined) statements.push({ set: 'retentionTime', value: long(system.retentionTime) });
  if (system.staticNAT !== undefined) statements.push({ set: 'staticNAT', value: rows(system.staticNAT) });
  if (system.modem !== undefined) {
    statements.push(
      { set: 'mode', value: int(system.modem.mode) },
      { set: 'port', value: int(system.modem.port) },
      { set: 'ipAdresse', value: system.modem.ipAddress },
    );
  }
  // SwitchFirmware.setSSID, Betriebssystem.setSsid.
  if (system.ssid !== undefined) statements.push({ set: javaClass === 'Switch' ? 'SSID' : 'ssid', value: system.ssid });
  return statements;
}

/**
 * The file system: the root's children added to the constructor's root
 * (named "root", empty on a PC or notebook), or a root of its own that
 * replaces it with the files a router's constructor makes. `arbeitsVerzeichnis`
 * is the property Java writes; `root` names the same field.
 */
function fileSystemStatement(root: FlsFileTree, constructedRoot: boolean): BeanStatement {
  if (!constructedRoot) return { get: 'dateisystem', statements: [{ set: 'arbeitsVerzeichnis', value: treeNode(root) }] };
  const statements: BeanStatement[] = [];
  if (!(root.kind === 'directory' && root.name === 'root')) statements.push({ set: 'userObject', value: userObject(root) });
  statements.push(...childStatements(root));
  return { get: 'dateisystem', statements: [{ get: 'arbeitsVerzeichnis', statements }] };
}

function childStatements(tree: FlsFileTree): BeanStatement[] {
  return tree.children.map((child) => ({ call: 'add', args: [treeNode(child)] }));
}

/** A DefaultMutableTreeNode; one of another kind than directory or file is written without a user object. */
function treeNode(tree: FlsFileTree): BeanObject {
  return object('javax.swing.tree.DefaultMutableTreeNode', childStatements(tree), tree.kind === 'other' ? [] : [userObject(tree)]);
}

/** A directory's name, or a file as `new Datei(name, typ, inhalt)`. */
function userObject(tree: FlsFileTree): BeanValue {
  if (tree.kind === 'file') return object('filius.software.system.Datei', [], [tree.name, tree.type, tree.content]);
  return tree.kind === 'directory' ? tree.name : null;
}

/**
 * An application's settings, after the system software it runs on. A
 * peer-to-peer application's peer count the file lacked stays unwritten, so
 * Java rolls one as it did.
 */
function applicationStatements(application: ApplicationToWrite, system: BeanReference): BeanStatement[] {
  const statements: BeanStatement[] = [{ set: 'systemSoftware', value: system }];
  if (application.isActive !== undefined) statements.push({ set: 'aktiv', value: application.isActive });
  if (application.port !== undefined) statements.push({ set: 'port', value: int(application.port) });
  if (application.targetAddress !== undefined) statements.push({ set: 'zielIPAdresse', value: application.targetAddress });
  if (application.targetPort !== undefined) statements.push({ set: 'zielPort', value: int(application.targetPort) });
  if (application.recursiveResolutionEnabled !== undefined) {
    statements.push({ set: 'recursiveResolutionEnabled', value: application.recursiveResolutionEnabled });
  }
  if (application.useVirtualHosts !== undefined) statements.push({ set: 'useVHost', value: application.useVirtualHosts });
  if (application.maxPeers !== undefined && application.maxPeers !== null) {
    statements.push({ set: 'maxTeilnehmerZahl', value: int(application.maxPeers) });
  }
  if (application.firewall !== undefined) statements.push(...firewallStatements(application.firewall));
  if (application.mailDomain !== undefined) statements.push({ set: 'mailDomain', value: application.mailDomain });
  if (application.beanAccounts !== undefined) {
    statements.push({ set: 'listeBenutzerkonten', value: listOf(application.beanAccounts.map(emailAccount)) });
  }
  if (application.received !== undefined) statements.push({ set: 'empfangeneNachrichten', value: emails(application.received) });
  if (application.sent !== undefined) statements.push({ set: 'gesendeteNachrichten', value: emails(application.sent) });
  if (application.drafts !== undefined) statements.push({ set: 'erstellteNachrichten', value: emails(application.drafts) });
  if (application.addressBook !== undefined) {
    statements.push({
      set: 'adressbuch',
      value: object(
        'java.util.Vector',
        application.addressBook.map((entry) => ({ call: 'add', args: [contact(entry)] })),
      ),
    });
  }
  return statements;
}

const EMAIL_PACKAGE = 'filius.software.email';

function emailAccount(account: JavaEmailAccount): BeanObject {
  return object(`${EMAIL_PACKAGE}.EmailKonto`, [
    { set: 'benutzername', value: account.username },
    { set: 'passwort', value: account.password },
    { set: 'nachname', value: account.lastName },
    { set: 'vorname', value: account.firstName },
    { set: 'emailAdresse', value: account.emailAddress },
    { set: 'pop3server', value: account.pop3Server },
    { set: 'pop3port', value: account.pop3Port },
    { set: 'smtpserver', value: account.smtpServer },
    { set: 'smtpport', value: account.smtpPort },
    { set: 'nachrichten', value: emails(account.messages) },
  ]);
}

function emails(messages: readonly JavaEmail[]): BeanObject {
  return listOf(
    messages.map((message) =>
      object(`${EMAIL_PACKAGE}.Email`, [
        { set: 'absender', value: address(message.sender) },
        { set: 'empfaenger', value: recipients(message.to) },
        { set: 'cc', value: recipients(message.cc) },
        { set: 'bcc', value: recipients(message.bcc) },
        { set: 'betreff', value: message.subject },
        { set: 'text', value: message.text },
        { set: 'dateReceived', value: message.dateReceived },
        { set: 'neu', value: message.isNew },
        { set: 'delete', value: message.isDeleted },
        { set: 'versendet', value: message.isSent },
      ]),
    ),
  );
}

/** A list of AddressEntry: a string read as Java's AddressEntry(String) reads it, null left out. */
function recipients(entries: readonly JavaRecipient[]): BeanObject {
  return object(
    'java.util.ArrayList',
    entries.flatMap((entry) =>
      entry === null ? [] : [{ call: 'add', args: [address(typeof entry === 'string' ? addressEntry(entry) : entry)] }],
    ),
  );
}

function address(entry: JavaAddressEntry): BeanObject {
  const statements: BeanStatement[] = [];
  if (entry.name !== null) statements.push({ set: 'name', value: entry.name });
  if (entry.mailAddress !== null) statements.push({ set: 'mailAddress', value: entry.mailAddress });
  return object(`${EMAIL_PACKAGE}.AddressEntry`, statements);
}

function contact(entry: JavaContact): BeanObject {
  return object(`${EMAIL_PACKAGE}.Kontakt`, [
    { set: 'name', value: entry.name },
    { set: 'vorname', value: entry.firstName },
    { set: 'strasse', value: entry.street },
    { set: 'hausnr', value: int(entry.houseNumber) },
    { set: 'plz', value: int(entry.postalCode) },
    { set: 'wohnort', value: entry.city },
    { set: 'email', value: entry.email },
    { set: 'telefon', value: entry.phone },
  ]);
}

/** A LinkedList of String arrays: routes, static NAT. */
function rows(table: readonly (readonly (string | null)[])[]): BeanObject {
  return listOf(table.map((row) => ({ kind: 'array', componentClass: 'java.lang.String', items: [...row] })));
}

function firewallStatements(firewall: FlsFirewall): BeanStatement[] {
  return [
    { set: 'activated', value: firewall.activated },
    { set: 'defaultPolicy', value: short(firewall.defaultPolicy) },
    { set: 'dropICMP', value: firewall.dropICMP },
    { set: 'filterSYNSegmentsOnly', value: firewall.filterSYNSegmentsOnly },
    { set: 'filterUdp', value: firewall.filterUdp },
    {
      set: 'ruleset',
      value: object(
        'java.util.Vector',
        firewall.rules.map((rule) => ({
          call: 'add',
          args: [
            object('filius.software.firewall.FirewallRule', [], [
              rule.srcIP,
              rule.srcMask,
              rule.destIP,
              rule.destMask,
              int(rule.port),
              short(rule.protocol),
              short(rule.action),
            ]),
          ],
        })),
      ),
    },
  ];
}

/**
 * A list the constructor filled with `constructed` elements: those are
 * changed through `get(index)`, more are added. With fewer, the list is set
 * anew. `ports` receives each element's port, in order.
 */
function constructedList(
  property: string,
  count: number,
  constructed: number,
  ports: BeanValue[],
  existing: (index: number) => { statements: BeanStatement[]; port?: BeanReference },
  added: (index: number) => { value: BeanValue; port: BeanValue },
): BeanStatement {
  if (count < constructed) {
    const values = Array.from({ length: count }, (_, index) => {
      const { value, port } = added(index);
      ports.push(port);
      return value;
    });
    return { set: property, value: listOf(values) };
  }
  const statements: BeanStatement[] = [];
  for (let index = 0; index < count; index++) {
    if (index < constructed) {
      // The element's own port, or — a switch's — the element itself.
      const { statements: inner, port } = existing(index);
      if (port === undefined) {
        const element = reference('Port');
        ports.push(element);
        statements.push({ getIndex: index, statements: inner, as: element });
      } else {
        ports.push(port);
        statements.push({ getIndex: index, statements: inner });
      }
    } else {
      const { value, port } = added(index);
      ports.push(port);
      statements.push({ call: 'add', args: [value] });
    }
  }
  return { get: property, statements };
}

/**
 * A network interface's setters. An address Java's setter rejected (null)
 * is not written: setIp(null) throws, and the constructor's address stays.
 * A MAC the file lacked stays unwritten, so Java rolls one as it did.
 */
function interfaceStatements(nic: FlsInterface): BeanStatement[] {
  const statements: BeanStatement[] = [];
  if (nic.ip !== null) statements.push({ set: 'ip', value: nic.ip });
  if (nic.mask !== null) statements.push({ set: 'subnetzMaske', value: nic.mask });
  if (nic.mac !== undefined) statements.push({ set: 'mac', value: nic.mac });
  statements.push({ set: 'gateway', value: nic.gateway }, { set: 'dns', value: nic.dns });
  if (nic.wireless) statements.push({ set: 'wireless', value: true });
  return statements;
}

function cableItem(link: FlsLink, items: readonly BeanObject[], ports: readonly BeanValue[][]): BeanObject {
  const [first, second] = link.ends;
  const end = (reference: { node: number; port: number }) => ports[reference.node]![reference.port]!;
  const cable = object('filius.hardware.Kabel', [
    { set: 'anschluesse', value: { kind: 'array', componentClass: 'filius.hardware.Port', items: [end(first), end(second)] } },
    ...(link.wireless ? [{ set: 'wireless', value: true }] : []),
  ]);
  return object('filius.gui.netzwerksicht.GUIKabelItem', [
    { set: 'dasKabel', value: cable },
    {
      get: 'kabelpanel',
      statements: [
        { set: 'ziel1', value: items[first.node]! },
        { set: 'ziel2', value: items[second.node]! },
      ],
    },
  ]);
}

function documentationItem(item: FlsDocumentationItem): BeanObject {
  const statements: BeanStatement[] = [];
  if (item.color !== null) statements.push({ set: 'color', value: object('java.awt.Color', [], item.color.map(int)) });
  if (item.font !== null) {
    statements.push({ set: 'font', value: object('java.awt.Font', [], [item.font.name, int(item.font.style), int(item.font.size)]) });
  }
  statements.push(
    { set: 'height', value: int(item.height) },
    { set: 'text', value: item.text },
    { set: 'type', value: int(item.type) },
    { set: 'width', value: int(item.width) },
    { set: 'x', value: int(item.x) },
    { set: 'y', value: int(item.y) },
  );
  return object('filius.gui.netzwerksicht.GUIDocuItem', statements);
}