/**
 * inject.ts — autofill icon + selector overlay, injected into pages.
 *
 * Runs as a content script. Injects the Peach icon next to detected login
 * fields, anchors it via event-driven positioning (no perpetual rAF — see
 * Projects.md §4.7), and renders the inline autofill selector in a shadow
 * DOM. Never holds decrypted vault data directly: all entry lookups go
 * through `chrome.runtime.sendMessage`, and only the minimum fields needed
 * to fill come back across the boundary.
 */

import { ACCENT_COLORS } from "../shared/types";

let accentHex = "#E8956D";
chrome.runtime.sendMessage({ type: "GET_SETTINGS" }, (resp: { ok: boolean; data?: { accentColor?: string } } | undefined) => {
  const name = resp?.data?.accentColor ?? "peach";
  accentHex = ACCENT_COLORS.find(c => c.name === name)?.hex ?? "#E8956D";
});

export interface SelectorEntry {
  id: string;
  title: string;
  username?: string;
  url?: string;
  hasTotp?: boolean;
}

interface SelectorOptions {
  domain?: string;
  searchableEntries?: SelectorEntry[];
  /** True when shown on a signup form — changes header label and entry-click behaviour */
  isSignup?: boolean;
  /**
   * Called after the user picks a saved identity (signup mode only) or
   * after successfully saving a new entry on a signup form.
   * Lets the caller fill the visible username + password fields.
   */
  onFillFields?: (username: string, password: string) => void;
  /**
   * When true, show an inline unlock form instead of the entries list.
   * Used when the vault is locked so the user can unlock without opening
   * the popup.
   */
  locked?: boolean;
  /**
   * Called after a successful inline unlock — the caller should re-query
   * entries and re-open the selector with real data.
   */
  onUnlocked?: () => void;
  /**
   * Called when the user explicitly dismisses the selector (Escape, Tab, or
   * click outside) — NOT when an entry is selected or on auto-close.
   * Used by the caller to suppress spurious reopens on the same field.
   */
  onDismiss?: () => void;
}

function getDomainFromUrl(url: string): string {
  try { return new URL(url).hostname.replace(/^www\./, ""); } catch { return ""; }
}

function keySvgStr(): string {
  return `<svg xmlns="http://www.w3.org/2000/svg" width="12" height="13" viewBox="0 0 12 13" fill="none" stroke="rgba(240,232,216,0.35)" stroke-width="0.95" stroke-linecap="round"><rect x="2" y="5.5" width="8" height="6" rx="1.5"/><path d="M4 5.5V4.25A2 2 0 0 1 6 2.25A2 2 0 0 1 8 4.25V5.5"/></svg>`;
}

function plusSvgStr(): string {
  return `<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"><path d="M6 1.5v9M1.5 6h9"/></svg>`;
}

function peachIconSvg(): string {
  // Peach body is always brand-peach (#D96830), not `accentHex` — a sage
  // or sky accent must not turn the autofill icon green or blue. Accent
  // color still tints surrounding glow/hover halos below.
  return `<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 64 64" fill="none" aria-hidden="true"><path d="M32 54C16 54 8 44 8 31C8 18 17 10 27 10C28 7 30 5.5 32 5.5C34 5.5 36 7 37 10C47 10 56 18 56 31C56 44 48 54 32 54Z" fill="#D96830"/><path d="M37 8.5C40.5 3.5 48 5 46 10.5C42 11 37 8.5 37 8.5Z" fill="#7B9060"/></svg>`;
}

function genSvgStr(): string {
  return `<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10" viewBox="0 0 11 11" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round"><path d="M9.5 2A4.5 4.5 0 1 0 10.5 5.5"/><path d="M8.5 2H9.5V1"/></svg>`;
}

function checkSvgStr(): string {
  return `<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 20 20" fill="none" stroke="#7B9060" stroke-width="1.5" stroke-linecap="round"><path d="M4 10.5L8 14.5L16 6.5"/></svg>`;
}

function smartUrl(): { origin: string; title: string; loginSubdomain: boolean } {
  const { hostname, origin } = location;
  const parts = hostname.split(".");
  const AUTH_PREFIXES = ["accounts", "auth", "login", "signin", "sign-in", "sso",
    "id", "identity", "secure", "portal", "my", "am", "idp", "connect", "oauth",
    "oidc", "federation", "saml", "cas", "ldap"];
  const loginSubdomain = parts.length > 2 && AUTH_PREFIXES.includes(parts[0]!.toLowerCase());
  const rootName = parts.length >= 2 ? parts[parts.length - 2]! : parts[0]!;
  const title = rootName.charAt(0).toUpperCase() + rootName.slice(1);
  return { origin, title, loginSubdomain };
}

/**
 * Shows a bottom-of-page toast after filling credentials when the entry's
 * saved domain doesn't match the current site — offering to set the current
 * origin as the entry's default URL. Closes automatically after 9 seconds.
 */
export function showDomainConfirmToast(
  pageDomain: string,
  entryId: string,
): void {
  const host = document.createElement("div");
  host.style.cssText = "position:fixed;bottom:22px;left:50%;transform:translateX(-50%);z-index:2147483647;pointer-events:auto;";
  host.style.setProperty("--peach-accent", accentHex);
  const shadow = host.attachShadow({ mode: "closed" });

  const style = document.createElement("style");
  style.textContent = `
    .bar {
      display:flex;align-items:center;gap:10px;padding:10px 14px;
      background:#131109;border:1px solid rgba(240,232,216,0.09);
      border-radius:10px;box-shadow:0 8px 32px rgba(0,0,0,0.75);
      font-family:Inter,sans-serif;white-space:nowrap;
      animation:tf-in 180ms cubic-bezier(0.16,1,0.3,1) both;
    }
    @keyframes tf-in { from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none} }
    .txt { font-size:11px;color:rgba(240,232,216,0.55);font-family:"IBM Plex Mono",monospace; }
    .yes {
      padding:5px 12px;border-radius:6px;border:none;cursor:pointer;font-size:11px;
      background:var(--peach-accent);color:#fff;transition:background 100ms;font-family:Inter,sans-serif;
    }
    .yes:hover { background:color-mix(in srgb, var(--peach-accent) 82%, #000); }
    .no {
      padding:5px 10px;border-radius:6px;border:none;cursor:pointer;font-size:11px;
      background:rgba(240,232,216,0.07);color:rgba(240,232,216,0.45);font-family:Inter,sans-serif;
    }
  `;
  shadow.appendChild(style);

  const bar = document.createElement("div"); bar.className = "bar";
  const txt = document.createElement("span"); txt.className = "txt";
  txt.textContent = `Set ${pageDomain} as default for this entry?`;
  const yesBtn = document.createElement("button"); yesBtn.className = "yes";
  yesBtn.textContent = "Set default";
  yesBtn.addEventListener("click", async () => {
    await chrome.runtime.sendMessage({
      type: "UPDATE_ENTRY",
      payload: { id: entryId, patch: { url: location.origin } },
    });
    host.remove();
  });
  const noBtn = document.createElement("button"); noBtn.className = "no";
  noBtn.textContent = "Skip";
  noBtn.addEventListener("click", () => host.remove());
  bar.append(txt, yesBtn, noBtn);
  shadow.appendChild(bar);
  document.body.appendChild(host);
  setTimeout(() => host.remove(), 9000);
}

function generatePassword(): string {
  const u = "ABCDEFGHIJKLMNOPQRSTUVWXYZ", l = "abcdefghijklmnopqrstuvwxyz";
  const n = "0123456789", s = "!@#$%^&*";
  const all = u + l + n + s;
  const arr = new Uint8Array(20);
  crypto.getRandomValues(arr);
  const res = [u[arr[0]! % u.length]!, l[arr[1]! % l.length]!, n[arr[2]! % n.length]!, s[arr[3]! % s.length]!,
    ...Array.from(arr.slice(4), b => all[b % all.length]!)];
  for (let i = res.length - 1; i > 0; i--) {
    const j = arr[i % arr.length]! % (i + 1);
    [res[i], res[j]] = [res[j]!, res[i]!];
  }
  return res.join("");
}

export function observeAnchorPosition(
  anchorEl: HTMLElement,
  onUpdate: () => void
): () => void {
  let rafId = 0;
  let burstUntil = 0;

  const runUpdate = () => {
    rafId = 0;
    onUpdate();
    if (performance.now() < burstUntil) rafId = requestAnimationFrame(runUpdate);
  };
  const scheduleUpdate = () => { if (!rafId) rafId = requestAnimationFrame(runUpdate); };
  const scheduleBurst = (ms = 220) => {
    burstUntil = Math.max(burstUntil, performance.now() + ms);
    scheduleUpdate();
  };

  const resizeObserver = new ResizeObserver(() => scheduleBurst());
  resizeObserver.observe(anchorEl);
  if (anchorEl.parentElement) resizeObserver.observe(anchorEl.parentElement);

  const mutationObserver = new MutationObserver(() => scheduleBurst());
  mutationObserver.observe(anchorEl, { attributes: true, attributeFilter: ["class", "style", "type", "hidden"] });
  if (anchorEl.parentElement) {
    mutationObserver.observe(anchorEl.parentElement, { attributes: true, attributeFilter: ["class", "style", "hidden"] });
  }

  const onScroll = () => scheduleUpdate();
  window.addEventListener("scroll", onScroll, true);
  window.addEventListener("resize", onScroll);
  window.visualViewport?.addEventListener("resize", onScroll);
  window.visualViewport?.addEventListener("scroll", onScroll);
  anchorEl.addEventListener("focus", () => scheduleBurst());
  anchorEl.addEventListener("input", () => scheduleBurst());

  scheduleBurst(260);

  return () => {
    if (rafId) cancelAnimationFrame(rafId);
    resizeObserver.disconnect();
    mutationObserver.disconnect();
    window.removeEventListener("scroll", onScroll, true);
    window.removeEventListener("resize", onScroll);
    window.visualViewport?.removeEventListener("resize", onScroll);
    window.visualViewport?.removeEventListener("scroll", onScroll);
  };
}

export function injectFieldIcon(field: HTMLInputElement, onClick: () => void): () => void {
  const button = document.createElement("button");
  button.type = "button";
  button.setAttribute("aria-label", "Peach autofill");
  button.title = "Fill with Peach";
  button.innerHTML = peachIconSvg();
  // position: fixed is load-bearing — not absolute. Absolute positioning
  // inherits the nearest positioned ancestor's box, which on sites with
  // overflow:hidden or sticky parents clips or offsets the icon. Fixed
  // anchors to the viewport and escapes all parent layout.
  button.style.cssText = `
    position: fixed; z-index: 2147483646;
    width: 26px; height: 26px; cursor: pointer;
    pointer-events: auto; border: none; padding: 3px;
    display: inline-flex; align-items: center; justify-content: center;
    background: transparent; border-radius: 999px;
    transition: opacity 140ms ease, background 120ms ease, box-shadow 120ms ease, transform 80ms ease;
    opacity: 0;
  `;
  button.addEventListener("mouseenter", () => {
    button.style.background = `color-mix(in srgb, ${accentHex} 12%, transparent)`;
    button.style.boxShadow = `0 0 0 1px color-mix(in srgb, ${accentHex} 18%, transparent), 0 0 14px color-mix(in srgb, ${accentHex} 12%, transparent)`;
    button.style.transform = "scale(1.08)";
  });
  button.addEventListener("mouseleave", () => {
    button.style.background = "transparent";
    button.style.boxShadow = "none";
    button.style.transform = "none";
  });
  button.addEventListener("pointerdown", e => { e.stopPropagation(); e.preventDefault(); });
  button.addEventListener("click", e => { e.stopPropagation(); e.preventDefault(); onClick(); });

  document.body.appendChild(button);

  function updatePosition() {
    const rect = field.getBoundingClientRect();
    if (rect.width === 0 || rect.height === 0) {
      button.style.opacity = "0"; button.style.pointerEvents = "none";
      return;
    }
    const sz = 26;
    const inset = Math.max(5, Math.min(10, rect.height * 0.22));
    const top = rect.top + rect.height / 2 - sz / 2;
    // Clamp left so the icon stays fully inside the field's right edge, never
    // spilling onto an adjacent sibling button.
    const minLeft = rect.left + 4;
    const left = Math.max(minLeft, rect.right - sz - inset);
    // Hide if the field is too narrow to fit the icon cleanly (< 40px)
    if (rect.width < 40) {
      button.style.opacity = "0"; button.style.pointerEvents = "none";
      return;
    }
    button.style.top = `${top}px`;
    button.style.left = `${left}px`;
    button.style.opacity = "1"; button.style.pointerEvents = "auto";
  }
  updatePosition();
  requestAnimationFrame(() => { button.style.opacity = "1"; });
  const stopObserving = observeAnchorPosition(field, updatePosition);
  return () => { stopObserving(); button.remove(); };
}

// ── Shared selector + new-entry styles ────────────────────────────
const SELECTOR_STYLES = `
  :host { all: initial; }
  *,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
  .selector {
    background: #0f0e0b;
    border: 1px solid rgba(240,232,216,0.10);
    border-radius: 13px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.45), 0 16px 48px rgba(0,0,0,0.7);
    font-family: Inter, -apple-system, BlinkMacSystemFont, sans-serif;
    animation: sl-in 180ms cubic-bezier(0.16,1,0.3,1) both;
  }
  @keyframes sl-in {
    from { opacity:0; transform:translateY(-6px) scale(0.97) }
    to   { opacity:1; transform:none }
  }

  /* Domain header */
  .domain-header {
    padding: 9px 13px 7px;
    border-bottom: 1px solid rgba(240,232,216,0.055);
    display: flex; align-items: center; justify-content: space-between;
  }
  .domain-eyebrow {
    font-size: 8px; letter-spacing: 0.12em; text-transform: uppercase;
    color: rgba(240,232,216,0.28); font-family: "IBM Plex Mono", monospace;
  }
  .domain-name {
    font-size: 10px; color: color-mix(in srgb, var(--peach-accent) 60%, transparent);
    font-family: "IBM Plex Mono", monospace;
  }

  /* Search */
  .search-wrap {
    padding: 9px 12px 7px;
    border-bottom: 1px solid rgba(240,232,216,0.04);
  }
  .search {
    width: 100%; background: rgba(240,232,216,0.03);
    border: 1px solid rgba(240,232,216,0.08);
    border-radius: 7px; color: #F0E8D8; padding: 7px 10px;
    font-size: 12px; outline: none; font-family: "IBM Plex Mono", monospace;
    transition: border-color 120ms, box-shadow 120ms;
  }
  .search:focus {
    border-color: color-mix(in srgb, var(--peach-accent) 40%, transparent);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--peach-accent) 10%, transparent);
  }
  .search::placeholder { color: rgba(240,232,216,0.2); }

  /* Results */
  .results { max-height: 256px; overflow-y: auto; scrollbar-width: none; }
  .results::-webkit-scrollbar { display: none; }

  /* Entry rows */
  .entry {
    display: flex; align-items: center; padding: 8px 12px;
    cursor: pointer; border-bottom: 1px solid rgba(240,232,216,0.04);
    transition: background 70ms; position: relative; outline: none;
  }
  .entry:last-child { border-bottom: none; }
  .entry:hover { background: rgba(240,232,216,0.04); }
  .entry.focused { background: color-mix(in srgb, var(--peach-accent) 8%, transparent); }
  .entry.focused::before {
    content: ""; position: absolute; left: 0; top: 3px; bottom: 3px;
    width: 2px; border-radius: 2px; background: color-mix(in srgb, var(--peach-accent) 55%, transparent);
  }

  .entry-icon {
    width: 28px; height: 28px; border-radius: 7px; flex-shrink: 0;
    background: rgba(240,232,216,0.04); border: 1px solid rgba(240,232,216,0.07);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden; margin-right: 10px;
  }
  .entry-icon img { width: 15px; height: 15px; border-radius: 2px; display: block; }
  .entry-icon.is-new {
    background: color-mix(in srgb, var(--peach-accent) 8%, transparent);
    border-color: color-mix(in srgb, var(--peach-accent) 15%, transparent);
    color: color-mix(in srgb, var(--peach-accent) 80%, transparent);
  }

  .entry-info { flex: 1; min-width: 0; }
  .entry-title {
    font-size: 12.5px; color: #F0E8D8;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    line-height: 1.3;
  }
  .entry-title.is-new { color: color-mix(in srgb, var(--peach-accent) 90%, transparent); font-size: 12px; }
  .entry-sub {
    font-size: 10px; color: rgba(240,232,216,0.32);
    font-family: "IBM Plex Mono", monospace;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    margin-top: 1px;
  }

  .totp-badge {
    font-size: 8px; letter-spacing: 0.04em; padding: 2px 6px;
    border-radius: 4px; background: color-mix(in srgb, var(--peach-accent) 10%, transparent);
    color: color-mix(in srgb, var(--peach-accent) 75%, transparent); font-family: "IBM Plex Mono", monospace;
    flex-shrink: 0; margin-left: 8px;
  }

  .divider { height: 1px; background: rgba(240,232,216,0.05); margin: 2px 0; }

  .empty-hint {
    padding: 14px 13px; font-size: 11px; color: rgba(240,232,216,0.28);
    font-family: "IBM Plex Mono", monospace;
  }

  /* ── Create form ─────────────────────────────────────── */
  .create-form-wrap {
    animation: cf-in 180ms cubic-bezier(0.16,1,0.3,1) both;
  }
  @keyframes cf-in {
    from { opacity:0; transform:translateX(8px) }
    to { opacity:1; transform:none }
  }
  .create-head {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 12px; border-bottom: 1px solid rgba(240,232,216,0.055);
  }
  .back-btn {
    background: transparent; border: none; cursor: pointer;
    color: rgba(240,232,216,0.38); padding: 3px; border-radius: 5px;
    display: flex; align-items: center; line-height: 0;
    transition: color 100ms, background 100ms;
  }
  .back-btn:hover { color: rgba(240,232,216,0.75); background: rgba(240,232,216,0.05); }
  .create-label { font-size: 12px; color: rgba(240,232,216,0.65); font-weight: 500; flex: 1; }
  .create-body { padding: 12px; display: grid; gap: 9px; }
  .f-group { display: grid; gap: 3px; }
  .f-label {
    font-size: 8px; letter-spacing: 0.12em; text-transform: uppercase;
    color: rgba(240,232,216,0.28); font-family: "IBM Plex Mono", monospace;
  }
  .f-input {
    background: rgba(240,232,216,0.035); border: 1px solid rgba(240,232,216,0.09);
    border-radius: 7px; color: #F0E8D8; padding: 7px 10px;
    font-size: 11px; font-family: "IBM Plex Mono", monospace;
    outline: none; width: 100%; transition: border-color 120ms, box-shadow 120ms;
  }
  .f-input:focus { border-color: color-mix(in srgb, var(--peach-accent) 40%, transparent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--peach-accent) 10%, transparent); }
  .f-input::placeholder { color: rgba(240,232,216,0.18); }
  .f-input.url-f { font-size: 10px; color: rgba(240,232,216,0.5); letter-spacing: 0.01em; }
  .f-row { display: flex; gap: 6px; }
  .f-row .f-input { flex: 1; min-width: 0; }
  .gen-btn {
    padding: 0 10px; border-radius: 7px; border: none;
    background: color-mix(in srgb, var(--peach-accent) 10%, transparent);
    color: color-mix(in srgb, var(--peach-accent) 80%, transparent);
    font-size: 10px; font-family: "IBM Plex Mono", monospace;
    cursor: pointer; white-space: nowrap; flex-shrink: 0;
    display: flex; align-items: center; gap: 4px;
    transition: background 100ms;
  }
  .gen-btn:hover { background: color-mix(in srgb, var(--peach-accent) 18%, transparent); }
  .save-btn {
    width: 100%; padding: 8px; border-radius: 8px; border: none;
    background: var(--peach-accent); color: #fff; font-size: 12px;
    font-family: Inter, sans-serif; cursor: pointer; font-weight: 500;
    transition: background 120ms; letter-spacing: 0.01em;
  }
  .save-btn:hover { background: color-mix(in srgb, var(--peach-accent) 82%, #000); }
  .save-btn:disabled { opacity: 0.4; cursor: not-allowed; }
  .url-hint {
    font-size: 9px; color: color-mix(in srgb, var(--peach-accent) 45%, transparent);
    font-family: "IBM Plex Mono", monospace; font-style: italic;
  }

  /* ── Success ─────────────────────────────────────────── */
  .success-wrap {
    display: flex; flex-direction: column; align-items: center;
    padding: 24px 16px 20px; gap: 8px;
    animation: su-in 280ms cubic-bezier(0.16,1,0.3,1) both;
  }
  @keyframes su-in { from{opacity:0;transform:scale(0.9)}to{opacity:1;transform:none} }
  .success-ring {
    width: 40px; height: 40px; border-radius: 50%;
    background: rgba(123,144,96,0.10); border: 1.5px solid rgba(123,144,96,0.25);
    display: flex; align-items: center; justify-content: center;
  }
  .success-text { font-size: 12.5px; color: #F0E8D8; font-weight: 500; }
  .success-sub { font-size: 10px; color: rgba(240,232,216,0.3); font-family:"IBM Plex Mono",monospace; }

  /* ── Locked state ────────────────────────────────────── */
  .locked-wrap {
    display: flex; flex-direction: column; align-items: stretch;
    padding: 14px 13px 13px; gap: 9px;
    animation: sl-in 180ms cubic-bezier(0.16,1,0.3,1) both;
  }
  .locked-head {
    display: flex; align-items: center; gap: 8px; padding-bottom: 2px;
  }
  .locked-icon {
    width: 24px; height: 24px; border-radius: 6px; flex-shrink: 0;
    background: rgba(240,232,216,0.04); border: 1px solid rgba(240,232,216,0.08);
    display: flex; align-items: center; justify-content: center;
  }
  .locked-title {
    font-size: 11.5px; color: rgba(240,232,216,0.55); font-weight: 500;
  }
  .locked-input {
    width: 100%; background: rgba(240,232,216,0.035); border: 1px solid rgba(240,232,216,0.09);
    border-radius: 7px; color: #F0E8D8; padding: 7px 10px;
    font-size: 11px; font-family: "IBM Plex Mono", monospace;
    outline: none; transition: border-color 120ms, box-shadow 120ms;
  }
  .locked-input:focus { border-color: color-mix(in srgb, var(--peach-accent) 40%, transparent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--peach-accent) 10%, transparent); }
  .locked-input::placeholder { color: rgba(240,232,216,0.2); }
  .locked-btn {
    width: 100%; padding: 8px; border-radius: 8px; border: none;
    background: var(--peach-accent); color: #fff; font-size: 12px;
    font-family: Inter, sans-serif; cursor: pointer; font-weight: 500;
    transition: background 120ms; letter-spacing: 0.01em;
  }
  .locked-btn:hover { background: color-mix(in srgb, var(--peach-accent) 82%, #000); }
  .locked-btn:disabled { opacity: 0.4; cursor: not-allowed; }
  .locked-error {
    font-size: 10px; color: rgba(220,80,60,0.85);
    font-family: "IBM Plex Mono", monospace;
  }
`;

export function showAutofillSelector(
  anchorEl: HTMLInputElement,
  entries: SelectorEntry[],
  onSelect: (id: string) => void,
  options: SelectorOptions = {}
): () => void {
  const host = document.createElement("div");
  host.style.cssText = "position: absolute; z-index: 2147483647;";
  host.style.setProperty("--peach-accent", accentHex);
  const shadow = host.attachShadow({ mode: "closed" });

  const style = shadow.appendChild(document.createElement("style"));
  style.textContent = SELECTOR_STYLES;

  const rect = anchorEl.getBoundingClientRect();
  host.style.top = `${rect.bottom + window.scrollY + 5}px`;
  host.style.left = `${rect.left + window.scrollX}px`;
  host.style.width = `${Math.max(rect.width, 260)}px`;

  const container = shadow.appendChild(document.createElement("div"));
  container.className = "selector";

  const searchableEntries = options.searchableEntries ?? [];
  const { origin: sOrigin, title: sTitle, loginSubdomain } = smartUrl();

  let query = "";
  let focusedIndex = -1;
  let currentMode: "list" | "create" | "success" = "list";
  let searchInput: HTMLInputElement | null = null;

  // Pre-capture the anchor field value for username prefill
  const preUsername = (anchorEl.type !== "password") ? (anchorEl.value?.trim() ?? "") : "";
  const pwInForm = anchorEl.closest("form")?.querySelector<HTMLInputElement>("input[type='password']");
  const prePassword = pwInForm?.value?.trim() ?? (anchorEl.type === "password" ? anchorEl.value?.trim() : "") ?? "";

  function uniqueEntries(list: SelectorEntry[]): SelectorEntry[] {
    const seen = new Set<string>();
    return list.filter(e => { if (seen.has(e.id)) return false; seen.add(e.id); return true; });
  }

  function filterEntries(source: SelectorEntry[], value: string): SelectorEntry[] {
    const q = value.trim().toLowerCase();
    const deduped = uniqueEntries(source);
    if (!q) return deduped.slice(0, 8);
    return deduped.filter(e =>
      [e.title, e.username ?? "", e.url ?? ""].join(" ").toLowerCase().includes(q)
    ).slice(0, 12);
  }

  function activeEntries(): SelectorEntry[] {
    // When user is typing a search, filter across all known entries (domain matches + vault)
    if (query.trim()) {
      const merged = uniqueEntries([...entries, ...searchableEntries]);
      return filterEntries(merged, query);
    }
    // Default: show domain matches; fall back to vault search when no matches
    if (entries.length > 0) return entries;
    return filterEntries(searchableEntries, "").slice(0, 8);
  }

  function makeEntryIcon(url?: string, isNew = false): HTMLDivElement {
    const icon = document.createElement("div");
    icon.className = `entry-icon${isNew ? " is-new" : ""}`;
    if (isNew) {
      icon.innerHTML = plusSvgStr();
    } else {
      // Use the generic key glyph for all entries in the page-injected selector.
      // Avoids disclosing vault domains to any third party and avoids needing
      // to expose the browser favicon API to page context via web_accessible_resources.
      void url;
      icon.innerHTML = keySvgStr();
    }
    return icon;
  }

  function renderList() {
    container.innerHTML = "";
    focusedIndex = -1;
    searchInput = null;

    const current = activeEntries();

    // Domain header (always show)
    const domHdr = document.createElement("div");
    domHdr.className = "domain-header";
    const eyebrow = document.createElement("div");
    eyebrow.className = "domain-eyebrow";
    eyebrow.textContent = options.isSignup
      ? "Sign up as"
      : entries.length > 0 ? "Saved for this site" : "No saved login";
    const domName = document.createElement("div");
    domName.className = "domain-name";
    domName.textContent = options.domain ?? location.hostname.replace(/^www\./, "");
    domHdr.append(eyebrow, domName);
    container.appendChild(domHdr);

    // Search — always show so user can find entries beyond the domain matches
    const sw = document.createElement("div"); sw.className = "search-wrap";
    searchInput = document.createElement("input");
    searchInput.className = "search";
    searchInput.placeholder = entries.length > 0 ? "search for another entry…" : "search vault…";
    searchInput.value = query;
    searchInput.addEventListener("input", () => {
      query = searchInput?.value ?? "";
      renderList();
      searchInput?.focus();
      searchInput?.setSelectionRange(query.length, query.length);
    });
    sw.appendChild(searchInput);
    container.appendChild(sw);

    // Results
    const results = document.createElement("div");
    results.className = "results";
    container.appendChild(results);

    if (current.length === 0 && entries.length > 0) {
      // Show a hint but don't render empty entries
    }

    for (let i = 0; i < current.length; i++) {
      const e = current[i]!;
      const entryEl = document.createElement("div");
      entryEl.className = "entry";
      entryEl.dataset.id = e.id;
      entryEl.dataset.index = String(i);
      entryEl.setAttribute("tabindex", "-1");

      entryEl.appendChild(makeEntryIcon(e.url));

      const info = document.createElement("div"); info.className = "entry-info";
      const titleEl = document.createElement("div"); titleEl.className = "entry-title"; titleEl.textContent = e.title;
      const subEl = document.createElement("div"); subEl.className = "entry-sub";
      const domain = e.url ? getDomainFromUrl(e.url) : "";
      subEl.textContent = domain || e.username || "";
      info.append(titleEl, subEl);
      entryEl.appendChild(info);

      if (e.hasTotp) {
        const badge = document.createElement("span"); badge.className = "totp-badge"; badge.textContent = "TOTP";
        entryEl.appendChild(badge);
      }

      entryEl.addEventListener("click", () => {
        if (options.isSignup && options.onFillFields) {
          // Signup mode: clicking a saved identity fills the username field
          options.onFillFields(e.username ?? "", "");
          dismiss();
        } else {
          onSelect(e.id);
          dismiss();
        }
      });
      results.appendChild(entryEl);
    }

    // Divider before "New entry"
    if (current.length > 0) {
      results.appendChild(Object.assign(document.createElement("div"), { className: "divider" }));
    }

    // "New entry" row — always present
    const newEl = document.createElement("div");
    newEl.className = "entry";
    newEl.setAttribute("tabindex", "-1");
    newEl.appendChild(makeEntryIcon(undefined, true));

    const newInfo = document.createElement("div"); newInfo.className = "entry-info";
    const newTitle = document.createElement("div");
    newTitle.className = "entry-title is-new";
    newTitle.textContent = `New entry for ${sTitle}`;
    const newSub = document.createElement("div");
    newSub.className = "entry-sub";
    newSub.textContent = sOrigin;
    newInfo.append(newTitle, newSub);
    newEl.appendChild(newInfo);
    newEl.addEventListener("click", showCreateForm);
    results.appendChild(newEl);

    // Focus search if present
    if (searchInput) {
      requestAnimationFrame(() => searchInput?.focus());
    }
  }

  function setFocused(idx: number) {
    const all = container.querySelectorAll<HTMLElement>(".entry");
    all.forEach((el, i) => el.classList.toggle("focused", i === idx));
    focusedIndex = idx;
    if (idx >= 0) (all[idx] as HTMLElement).scrollIntoView({ block: "nearest" });
  }

  async function showCreateForm() {
    currentMode = "create";
    container.innerHTML = "";

    // Guard: the service worker may lock the vault between when the selector
    // opens and when the user clicks "New entry". Show the inline unlock form
    // instead of silently failing on save.
    const statusRes = await chrome.runtime.sendMessage({ type: "GET_VAULT_STATUS" }).catch(() => null) as { unlocked?: boolean } | null;
    if (!statusRes?.unlocked) {
      renderLocked();
      return;
    }

    const wrap = document.createElement("div");
    wrap.className = "create-form-wrap";

    // Header
    const head = document.createElement("div"); head.className = "create-head";
    const backBtn = document.createElement("button"); backBtn.className = "back-btn";
    backBtn.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="7" height="12" viewBox="0 0 8 14" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"><path d="M6 1L1.5 7L6 13"/></svg>`;
    backBtn.addEventListener("click", () => { currentMode = "list"; renderList(); });
    const lbl = document.createElement("div"); lbl.className = "create-label"; lbl.textContent = "New entry";
    head.append(backBtn, lbl);

    // Body
    const body = document.createElement("div"); body.className = "create-body";

    function fGroup(label: string): { g: HTMLDivElement; inp: HTMLInputElement } {
      const g = document.createElement("div"); g.className = "f-group";
      const l = document.createElement("div"); l.className = "f-label"; l.textContent = label;
      const inp = document.createElement("input"); inp.className = "f-input";
      g.append(l, inp); return { g, inp };
    }

    // Title
    const tg = fGroup("title"); tg.inp.value = sTitle; tg.inp.placeholder = "e.g. Google";
    body.appendChild(tg.g);

    // URL
    const ug = fGroup("website");
    ug.inp.className = "f-input url-f"; ug.inp.value = sOrigin; ug.inp.placeholder = "https://";
    if (loginSubdomain) {
      const h = document.createElement("div"); h.className = "url-hint";
      h.textContent = "⊘ Recognized sign-in subdomain"; ug.g.appendChild(h);
    }
    body.appendChild(ug.g);

    // Username (pre-fill from anchor field)
    const xg = fGroup("username / email");
    xg.inp.value = preUsername; xg.inp.placeholder = "your@email.com";
    xg.inp.setAttribute("autocomplete", "off");
    body.appendChild(xg.g);

    // Password + generate
    const pg = fGroup("password");
    const pwInp = document.createElement("input"); pwInp.className = "f-input";
    pwInp.type = "text"; pwInp.value = prePassword || generatePassword();
    pwInp.style.fontFamily = '"IBM Plex Mono", monospace';
    pwInp.style.letterSpacing = "0.04em";
    pwInp.setAttribute("autocomplete", "off"); pwInp.setAttribute("spellcheck", "false");
    const genBtn = document.createElement("button"); genBtn.className = "gen-btn"; genBtn.type = "button";
    genBtn.innerHTML = genSvgStr() + " regen";
    genBtn.addEventListener("click", () => { pwInp.value = generatePassword(); });
    const pwRow = document.createElement("div"); pwRow.className = "f-row";
    pwRow.append(pwInp, genBtn); pg.g.appendChild(pwRow);
    body.appendChild(pg.g);

    // Save
    const saveBtn = document.createElement("button"); saveBtn.className = "save-btn"; saveBtn.type = "button";
    saveBtn.textContent = "Save entry";
    const errEl = document.createElement("div"); errEl.className = "locked-error"; errEl.style.display = "none";
    function showFormError(msg: string) { errEl.textContent = msg; errEl.style.display = ""; }
    saveBtn.addEventListener("click", async () => {
      const title = tg.inp.value.trim();
      const pw = pwInp.value.trim();
      const username = xg.inp.value.trim();
      if (!title) {
        tg.inp.style.borderColor = "rgba(220,70,60,0.5)"; tg.inp.focus();
        showFormError("Entry needs a title");
        return;
      }
      if (!pw) {
        pwInp.style.borderColor = "rgba(220,70,60,0.5)"; pwInp.focus();
        showFormError("Entry needs a password");
        return;
      }
      errEl.style.display = "none";
      saveBtn.disabled = true; saveBtn.textContent = "Saving…";
      try {
        const res = await chrome.runtime.sendMessage({
          type: "ADD_ENTRY",
          payload: { entry: { title, url: ug.inp.value.trim(), username, password: pw, type: "login" } },
        });
        if ((res as { ok?: boolean }).ok) {
          // In signup mode, fill the username + password fields on the page
          if (options.isSignup && options.onFillFields) {
            options.onFillFields(username, pw);
          }
          showSuccess(title);
        } else {
          const errMsg = (res as { error?: string }).error === "vault locked"
            ? "Vault locked — open Peach to save"
            : "Could not save entry";
          showFormError(errMsg);
          saveBtn.disabled = false; saveBtn.textContent = "Save entry";
        }
      } catch { showFormError("Could not reach Peach"); saveBtn.disabled = false; saveBtn.textContent = "Save entry"; }
    });
    body.appendChild(saveBtn);
    body.appendChild(errEl);

    wrap.append(head, body);
    container.appendChild(wrap);
    requestAnimationFrame(() => { tg.inp.focus(); tg.inp.select(); });
  }

  function showSuccess(title: string) {
    currentMode = "success";
    container.innerHTML = "";
    const wrap = document.createElement("div"); wrap.className = "success-wrap";
    const ring = document.createElement("div"); ring.className = "success-ring";
    ring.innerHTML = checkSvgStr();
    const t = document.createElement("div"); t.className = "success-text"; t.textContent = `${title} saved`;
    const s = document.createElement("div"); s.className = "success-sub"; s.textContent = sOrigin;
    wrap.append(ring, t, s);
    container.appendChild(wrap);
    setTimeout(() => dismiss(), 1600);
  }

  function renderLocked() {
    container.innerHTML = "";

    // Domain header (same as list view)
    const domHdr = document.createElement("div");
    domHdr.className = "domain-header";
    const eyebrow = document.createElement("div");
    eyebrow.className = "domain-eyebrow";
    eyebrow.textContent = "vault locked";
    const domName = document.createElement("div");
    domName.className = "domain-name";
    domName.textContent = options.domain ?? location.hostname.replace(/^www\./, "");
    domHdr.append(eyebrow, domName);
    container.appendChild(domHdr);

    const wrap = document.createElement("div");
    wrap.className = "locked-wrap";

    // Icon + label row
    const head = document.createElement("div"); head.className = "locked-head";
    const icon = document.createElement("div"); icon.className = "locked-icon";
    icon.innerHTML = keySvgStr();
    const title = document.createElement("div"); title.className = "locked-title";
    title.textContent = "unlock to autofill";
    head.append(icon, title);

    // Password input
    const pwInp = document.createElement("input");
    pwInp.className = "locked-input";
    pwInp.type = "password";
    pwInp.placeholder = "master password";
    pwInp.setAttribute("autocomplete", "current-password");

    // Error line (hidden initially)
    const errEl = document.createElement("div");
    errEl.className = "locked-error";
    errEl.style.display = "none";

    // Unlock button
    const unlockBtn = document.createElement("button");
    unlockBtn.className = "locked-btn";
    unlockBtn.type = "button";
    unlockBtn.textContent = "unlock";

    async function tryUnlock() {
      const pw = pwInp.value.trim();
      if (!pw) { pwInp.focus(); return; }
      unlockBtn.disabled = true;
      unlockBtn.textContent = "unlocking…";
      errEl.style.display = "none";
      try {
        const res = await chrome.runtime.sendMessage({
          type: "UNLOCK",
          payload: { password: pw },
        });
        if ((res as { ok?: boolean }).ok) {
          dismiss();
          options.onUnlocked?.();
        } else {
          errEl.textContent = "incorrect password";
          errEl.style.display = "block";
          pwInp.value = "";
          pwInp.focus();
          unlockBtn.disabled = false;
          unlockBtn.textContent = "unlock";
        }
      } catch {
        errEl.textContent = "could not reach Peach";
        errEl.style.display = "block";
        unlockBtn.disabled = false;
        unlockBtn.textContent = "unlock";
      }
    }

    pwInp.addEventListener("keydown", (e) => { if (e.key === "Enter") void tryUnlock(); });
    unlockBtn.addEventListener("click", () => void tryUnlock());

    wrap.append(head, pwInp, errEl, unlockBtn);
    container.appendChild(wrap);
    requestAnimationFrame(() => pwInp.focus());
  }

  function handleKeyDown(e: KeyboardEvent) {
    if (options.locked) {
      if (e.key === "Escape") { e.preventDefault(); dismiss(true); }
      return;
    }
    if (currentMode === "create" || currentMode === "success") {
      if (e.key === "Escape") { e.preventDefault(); dismiss(true); }
      return;
    }
    const allEntryEls = container.querySelectorAll(".entry:not(.empty-state)");
    const count = allEntryEls.length;
    if (document.activeElement === searchInput) {
      if (e.key === "Escape" || e.key === "Tab") { e.preventDefault(); dismiss(true); return; }
      if (count === 0) return;
      if (!["ArrowDown", "ArrowUp", "Enter"].includes(e.key)) return;
    }
    if (count === 0) return;
    switch (e.key) {
      case "ArrowDown": e.preventDefault(); setFocused(focusedIndex < count - 1 ? focusedIndex + 1 : 0); break;
      case "ArrowUp": e.preventDefault(); setFocused(focusedIndex > 0 ? focusedIndex - 1 : count - 1); break;
      case "Enter": {
        if (focusedIndex >= 0) {
          const el = allEntryEls[focusedIndex] as HTMLElement;
          const id = el.dataset.id;
          if (id) { onSelect(id); dismiss(); }
          else if (el.classList.contains("is-new") || !id) {
            // "New entry" row (last item, no data-id)
            showCreateForm();
          }
        }
        break;
      }
      case "Escape": case "Tab": e.preventDefault(); dismiss(true); break;
    }
  }

  document.addEventListener("keydown", handleKeyDown);

  document.body.appendChild(host);
  if (options.locked) {
    renderLocked();
  } else {
    renderList();
  }

  function updatePosition() {
    const r = anchorEl.getBoundingClientRect();
    host.style.top = `${r.bottom + window.scrollY + 5}px`;
    host.style.left = `${r.left + window.scrollX}px`;
    host.style.width = `${Math.max(r.width, 260)}px`;
  }
  const stopObserving = observeAnchorPosition(anchorEl, updatePosition);

  function dismiss(userAction = false) {
    stopObserving();
    host.remove();
    document.removeEventListener("click", outsideClick, { capture: true });
    document.removeEventListener("keydown", handleKeyDown);
    if (userAction) options.onDismiss?.();
  }

  function outsideClick(ev: MouseEvent) {
    const path = ev.composedPath();
    // Never dismiss when clicking the anchor field itself — that click is
    // what triggered the selector to open, and the user may click the field
    // again to re-focus it without intending to close the selector.
    if (!path.includes(host) && !path.includes(anchorEl)) dismiss(true);
  }
  // capture: true so pages that call stopPropagation() on click don't block our dismiss handler
  setTimeout(() => document.addEventListener("click", outsideClick, { capture: true }), 0);

  return dismiss;
}