const state = {
  config: null,
  selected: 0,
  view: "servers",
  query: "",
  capabilities: null,
};

const els = {
  navItems: document.querySelectorAll(".nav-item"),
  views: {
    servers: document.querySelector("#serversView"),
    commands: document.querySelector("#commandsView"),
    settings: document.querySelector("#settingsView"),
  },
  viewTitle: document.querySelector("#viewTitle"),
  terminalStatus: document.querySelector("#terminalStatus"),
  searchInput: document.querySelector("#searchInput"),
  serverGrid: document.querySelector("#serverGrid"),
  serverForm: document.querySelector("#serverForm"),
  formTitle: document.querySelector("#formTitle"),
  deleteButton: document.querySelector("#deleteButton"),
  connectButton: document.querySelector("#connectButton"),
  addButton: document.querySelector("#addButton"),
  reloadButton: document.querySelector("#reloadButton"),
  sshButton: document.querySelector("#sshButton"),
  sshCommand: document.querySelector("#sshCommand"),
  commandsList: document.querySelector("#commandsList"),
  settingsForm: document.querySelector("#settingsForm"),
  toast: document.querySelector("#toast"),
};

async function loadConfig() {
  const [configResponse, capabilitiesResponse] = await Promise.all([
    fetch("/api/config"),
    fetch("/api/capabilities"),
  ]);

  const response = configResponse;
  if (!response.ok) throw new Error("Config konnte nicht geladen werden");
  state.config = await response.json();
  state.capabilities = capabilitiesResponse.ok ? await capabilitiesResponse.json() : null;
  state.selected = Math.min(state.selected, Math.max(0, state.config.servers.length - 1));
  render();
}

async function saveConfig(message = "Gespeichert") {
  const response = await fetch("/api/config", {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(state.config),
  });

  if (!response.ok) throw new Error("Config konnte nicht gespeichert werden");
  state.config = await response.json();
  showToast(message);
  render();
}

function render() {
  renderNavigation();
  renderServers();
  renderServerForm();
  renderCommands();
  renderSettings();
}

function renderNavigation() {
  els.navItems.forEach((item) => {
    item.classList.toggle("active", item.dataset.view === state.view);
  });

  Object.entries(els.views).forEach(([name, node]) => {
    node.classList.toggle("active", name === state.view);
  });

  const titles = {
    servers: "Server",
    commands: "Quick Commands",
    settings: "Settings",
  };
  els.viewTitle.textContent = titles[state.view];

  if (state.capabilities?.terminal_available) {
    els.terminalStatus.textContent = `Terminal: ${state.capabilities.terminal}`;
  } else {
    els.terminalStatus.textContent = "Kein unterstützter Terminal-Emulator gefunden";
  }
}

function filteredServers() {
  const query = state.query.trim().toLowerCase();
  const servers = state.config?.servers ?? [];
  if (!query) return servers.map((server, index) => ({ server, index }));

  return servers
    .map((server, index) => ({ server, index }))
    .filter(({ server }) => {
      return [server.name, server.host, server.user, server.group, server.auth]
        .join(" ")
        .toLowerCase()
        .includes(query);
    });
}

function renderServers() {
  const items = filteredServers();
  els.serverGrid.innerHTML = "";

  if (items.length === 0) {
    els.serverGrid.innerHTML = `<p class="server-meta">Keine Server gefunden.</p>`;
    return;
  }

  for (const { server, index } of items) {
    const card = document.createElement("article");
    card.className = "server-card";
    card.classList.toggle("active", index === state.selected);
    card.innerHTML = `
      <h3>${escapeHTML(server.name || "Unbenannt")}</h3>
      <p class="server-meta">${escapeHTML(server.user || "")}@${escapeHTML(server.host || "")}:${server.port || 22}</p>
      <div class="pill-row">
        <span class="pill">${escapeHTML(server.group || "Keine Gruppe")}</span>
        <span class="pill">${escapeHTML(server.auth || "key")}</span>
        ${server.kitty_fix ? `<span class="pill">kitty</span>` : ""}
      </div>
    `;
    card.addEventListener("click", () => {
      state.selected = index;
      els.sshCommand.hidden = true;
      render();
    });
    els.serverGrid.append(card);
  }
}

function renderServerForm() {
  const server = state.config?.servers?.[state.selected];
  const disabled = !server;
  els.serverForm.querySelectorAll("input, select, button").forEach((input) => {
    input.disabled = disabled;
  });
  els.connectButton.disabled = disabled || !state.capabilities?.terminal_available;

  if (!server) {
    els.formTitle.textContent = "Kein Server ausgewählt";
    els.serverForm.reset();
    return;
  }

  els.formTitle.textContent = server.name ? `${server.name} bearbeiten` : "Server bearbeiten";
  setFormValue("name", server.name);
  setFormValue("host", server.host);
  setFormValue("user", server.user);
  setFormValue("port", server.port || 22);
  setFormValue("group", server.group);
  setFormValue("auth", server.auth || "key");
  setFormValue("key", server.key);
  setFormValue("password_id", server.password_id);
  els.serverForm.elements.kitty_fix.checked = Boolean(server.kitty_fix);
}

function renderCommands() {
  const commands = state.config?.quick_commands ?? [];
  els.commandsList.innerHTML = "";

  if (commands.length === 0) {
    els.commandsList.innerHTML = `<p class="server-meta">Keine Quick Commands konfiguriert.</p>`;
    return;
  }

  for (const command of commands) {
    const item = document.createElement("article");
    item.className = "command-item";
    item.innerHTML = `
      <h3>${escapeHTML(command.name)}</h3>
      <code>${escapeHTML(command.command)}</code>
    `;
    els.commandsList.append(item);
  }
}

function renderSettings() {
  const settings = state.config?.settings;
  if (!settings) return;

  els.settingsForm.elements.theme.value = settings.theme || "neon-green";
  els.settingsForm.elements.term.value = settings.terminal?.term || "xterm-256color";
  els.settingsForm.elements.enable_kitty_fix.checked = Boolean(settings.terminal?.enable_kitty_fix);
}

function addServer() {
  state.config.servers.push({
    name: "Neuer Server",
    host: "",
    user: "root",
    port: 22,
    group: "Homelab",
    auth: "key",
    key: "",
    password_id: "",
    kitty_fix: true,
  });
  state.selected = state.config.servers.length - 1;
  state.view = "servers";
  render();
}

function collectServerForm() {
  const form = els.serverForm.elements;
  return {
    name: form.name.value.trim(),
    host: form.host.value.trim(),
    user: form.user.value.trim(),
    port: Number(form.port.value) || 22,
    group: form.group.value.trim(),
    auth: form.auth.value,
    key: form.key.value.trim(),
    password_id: form.password_id.value.trim(),
    kitty_fix: form.kitty_fix.checked,
  };
}

function setFormValue(name, value) {
  els.serverForm.elements[name].value = value ?? "";
}

async function showSSHCommand() {
  const response = await fetch(`/api/ssh-command/${state.selected}`, { method: "POST" });
  if (!response.ok) throw new Error("SSH Befehl konnte nicht erzeugt werden");

  const data = await response.json();
  els.sshCommand.textContent = data.command;
  els.sshCommand.hidden = false;
}

async function connectSSH() {
  const response = await fetch(`/api/connect/${state.selected}`, { method: "POST" });
  const data = await response.json();

  if (!response.ok) {
    throw new Error(data.error || "SSH Verbindung konnte nicht gestartet werden");
  }

  els.sshCommand.textContent = data.command;
  els.sshCommand.hidden = false;
  showToast("SSH Terminal gestartet");
}

function showToast(message) {
  els.toast.textContent = message;
  els.toast.hidden = false;
  window.setTimeout(() => {
    els.toast.hidden = true;
  }, 2200);
}

function escapeHTML(value) {
  return String(value ?? "")
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

els.navItems.forEach((item) => {
  item.addEventListener("click", () => {
    state.view = item.dataset.view;
    render();
  });
});

els.searchInput.addEventListener("input", (event) => {
  state.query = event.target.value;
  renderServers();
});

els.addButton.addEventListener("click", addServer);
els.reloadButton.addEventListener("click", () => loadConfig().then(() => showToast("Neu geladen")).catch((error) => showToast(error.message)));
els.sshButton.addEventListener("click", () => showSSHCommand().catch((error) => showToast(error.message)));
els.connectButton.addEventListener("click", () => connectSSH().catch((error) => showToast(error.message)));

els.deleteButton.addEventListener("click", async () => {
  if (!state.config.servers[state.selected]) return;
  state.config.servers.splice(state.selected, 1);
  state.selected = Math.max(0, state.selected - 1);
  await saveConfig("Server gelöscht");
});

els.serverForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  const server = collectServerForm();

  if (!server.name || !server.host || !server.user) {
    showToast("Name, Host und User sind Pflichtfelder");
    return;
  }

  state.config.servers[state.selected] = server;
  await saveConfig("Server gespeichert");
});

els.settingsForm.addEventListener("submit", async (event) => {
  event.preventDefault();
  const form = els.settingsForm.elements;
  state.config.settings = {
    theme: form.theme.value.trim() || "neon-green",
    terminal: {
      term: form.term.value.trim() || "xterm-256color",
      enable_kitty_fix: form.enable_kitty_fix.checked,
    },
  };
  await saveConfig("Settings gespeichert");
});

loadConfig().catch((error) => showToast(error.message));