// Wallet panel. All state comes from the add-on's activate() context via
// window.silentmode.invoke / on; this file only renders and collects input.
const $ = (id) => document.getElementById(id);
const S = window.silentmode;
let state = null;
let tab = "receive";

// 8 decimals, trailing zeros trimmed, never fewer than two: 0.00, 0.001, 1.23456789
function fmtBch(sats) {
  let s = (Number(sats || 0) / 1e8).toFixed(8).replace(/0+$/, "");
  if (s.endsWith(".")) s += "00"; else if (/\.\d$/.test(s)) s += "0";
  return s;
}
const fmtSats = (sats) => Number(sats || 0).toLocaleString("en-US");
const esc = (s) => String(s ?? "").replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[c]);
const hostOf = (url) => { try { return new URL(url).host; } catch { return url; } };
const openUrl = (url) => S.invoke("openUrl", { url }).catch(() => {});

// ---- tabs ------------------------------------------------------------------
document.querySelectorAll("nav button").forEach((b) => b.addEventListener("click", () => showTab(b.dataset.tab)));
function showTab(name) {
  tab = name;
  document.querySelectorAll("nav button").forEach((b) => b.classList.toggle("on", b.dataset.tab === name));
  document.querySelectorAll("main section").forEach((s) => { s.hidden = s.id !== "tab-" + name; });
  if (name === "settings") fillSettings();
}

// ---- render ----------------------------------------------------------------
function render() {
  if (!state) return;
  const ready = state.phase === "ready";
  const gate = $("gate");
  $("tabs").hidden = !ready;
  gate.hidden = ready;
  if (!ready) {
    const copy = {
      locked:  ["🔒", "Unlock your password vault to open the wallet.", "Settings › Passwords. The wallet keys derive from the vault seed, so there is nothing separate to unlock."],
      nosetup: ["🗝", "Set up a password vault to create your wallet.", "Settings › Passwords › Set up. Use a recovery phrase there and this wallet can be recreated from it on any machine."],
      error:   ["⚠", "The wallet could not start.", state.error || ""],
    }[state.phase] || ["…", "Starting…", ""];
    gate.innerHTML = `<div class="big">${copy[0]}</div><div><b>${esc(copy[1])}</b></div><div class="hint" style="margin-top:8px">${esc(copy[2])}</div>`;
  }
  // header
  const dot = $("dot");
  dot.className = "dot " + (state.server ? (state.scanning ? "busy" : "on") : "");
  $("netlbl").textContent = state.server ? hostOf(state.server) + (state.scanning ? " · syncing" : "") : (ready ? "connecting…" : "mainnet");
  if (ready) {
    const total = (state.balance?.confirmed || 0) + (state.balance?.unconfirmed || 0);
    $("balBch").textContent = fmtBch(total);
    const parts = [fmtSats(total) + " sat"];
    if (state.balance?.unconfirmed) parts.push(fmtBch(state.balance.unconfirmed) + " unconfirmed");
    if (state.height) parts.push("block " + fmtSats(state.height));
    $("balSub").textContent = parts.join(" · ");
  } else { $("balBch").textContent = "—"; $("balSub").textContent = "mainnet"; }
  if (!ready) return;
  // receive
  if (state.address && $("addr").textContent !== state.address) {
    $("addr").textContent = state.address;
    drawQr("bitcoincash:" + state.address.replace(/^bitcoincash:/, ""));
  }
  $("addrMeta").textContent = `· #${state.addressIndex} · ${state.addressPath || ""}`;
  // history
  renderHistory();
  if (state.error) { $("balSub").textContent = state.error; }
}

function drawQr(text) {
  const cv = $("qr");
  const g = cv.getContext("2d");
  let q;
  try { q = window.QR.build(text); } catch { g.clearRect(0, 0, cv.width, cv.height); return; }
  const scale = Math.max(2, Math.floor(200 / (q.size + 2)));
  const px = (q.size + 2) * scale;
  cv.width = cv.height = px;
  cv.style.width = cv.style.height = px + "px";
  g.fillStyle = "#fff"; g.fillRect(0, 0, px, px);
  g.fillStyle = "#000";
  for (let r = 0; r < q.size; r++) for (let c = 0; c < q.size; c++) if (q.modules[r][c]) g.fillRect((c + 1) * scale, (r + 1) * scale, scale, scale);
}

function renderHistory() {
  const list = state.history || [];
  const el = $("txlist");
  if (!list.length) { el.innerHTML = `<div class="empty">${state.scanning ? "Syncing…" : "No transactions yet."}</div>`; return; }
  el.innerHTML = list.map((t) => {
    const inc = t.delta >= 0;
    const when = t.time ? new Date(t.time * 1000).toLocaleString(undefined, { dateStyle: "medium", timeStyle: "short" }) : "pending";
    const what = inc ? "Received" : ("Sent" + (t.to ? " to " + esc(t.to.replace(/^bitcoincash:/, "").slice(0, 12)) + "…" : ""));
    const conf = t.confirmations > 0 ? (t.confirmations >= 6 ? "confirmed" : t.confirmations + " conf") : "unconfirmed";
    return `<div class="tx" data-txid="${esc(t.txid)}" title="${esc(t.txid)}">
      <div class="ic ${inc ? "in" : "out"}">${inc ? "↓" : "↑"}</div>
      <div class="what">${what}</div>
      <div class="amt2 ${inc ? "in" : ""}">${inc ? "+" : "−"}${fmtBch(Math.abs(t.delta))}</div>
      <div class="when">${esc(when)}${t.fee != null ? " · fee " + fmtSats(t.fee) + " sat" : ""}</div>
      <div class="conf ${t.confirmations > 0 ? "" : "pending"}">${conf}</div>
    </div>`;
  }).join("");
  el.querySelectorAll(".tx").forEach((row) => row.addEventListener("click", () => openUrl(state.explorerTx + row.dataset.txid)));
}

// ---- receive actions -------------------------------------------------------
$("copyAddr").addEventListener("click", async () => {
  try { await navigator.clipboard.writeText(state.address); flash($("copyAddr"), "Copied"); } catch {}
});
$("nextAddr").addEventListener("click", async () => {
  try { state = await S.invoke("nextAddress"); render(); } catch (e) { flash($("nextAddr"), "Failed"); }
});
$("viewAddr").addEventListener("click", () => openUrl(state.explorerAddr + state.address));
function flash(btn, text) {
  const old = btn.textContent; btn.textContent = text;
  setTimeout(() => { btn.textContent = old; }, 1200);
}

// ---- send ------------------------------------------------------------------
let unit = "bch";
let sendMax = false;
let planTimer = null;
let lastPlan = null;
function amountSats() {
  const raw = $("sendAmt").value.trim().replace(/,/g, "");
  if (!raw) return 0;
  if (unit === "sat") return Math.round(Number(raw));
  const [w, f = ""] = raw.split(".");
  return Number(w || 0) * 1e8 + Math.round(Number("0." + (f || "0")) * 1e8);
}
function setUnit(u) {
  if (u === unit) return;
  const s = amountSats();
  unit = u;
  $("unitBch").classList.toggle("on", u === "bch"); $("unitSat").classList.toggle("on", u === "sat");
  $("sendAmt").placeholder = u === "bch" ? "0.00" : "0";
  if (s) $("sendAmt").value = u === "bch" ? fmtBch(s) : String(s);
}
$("unitBch").addEventListener("click", () => setUnit("bch"));
$("unitSat").addEventListener("click", () => setUnit("sat"));
$("sendMax").addEventListener("click", () => {
  sendMax = !sendMax;
  $("sendMax").classList.toggle("primary", sendMax);
  $("sendAmt").disabled = sendMax;
  if (!sendMax) $("sendAmt").value = "";
  schedulePlan();
});
$("feeRate").addEventListener("input", () => { $("feeLbl").textContent = $("feeRate").value + " sat/B"; schedulePlan(); });
["sendTo", "sendAmt"].forEach((id) => $(id).addEventListener("input", () => { if (id === "sendAmt" && sendMax) return; schedulePlan(); }));
function schedulePlan() { clearTimeout(planTimer); planTimer = setTimeout(updatePlan, 250); }
async function updatePlan() {
  const to = $("sendTo").value.trim();
  const msg = $("sendMsg"); msg.hidden = true;
  lastPlan = null; $("sendBtn").disabled = true;
  $("sumAmt").textContent = $("sumFee").textContent = $("sumTotal").textContent = "—";
  $("sendToHint").textContent = "";
  if (!to || (!sendMax && !amountSats())) return;
  try {
    const p = await S.invoke("planSend", { to, amount: amountSats(), feeRate: Number($("feeRate").value), sendMax });
    lastPlan = p;
    $("sendToHint").textContent = p.recipients[0].to !== to ? "→ " + p.recipients[0].to : "";
    $("sumAmt").textContent = fmtBch(p.recipients[0].value) + " BCH";
    $("sumFee").textContent = fmtSats(p.fee) + " sat";
    $("sumTotal").textContent = fmtBch(p.total) + " BCH";
    if (sendMax) $("sendAmt").value = unit === "bch" ? fmtBch(p.recipients[0].value) : String(p.recipients[0].value);
    $("sendBtn").disabled = false;
  } catch (e) {
    msg.className = "msg err"; msg.textContent = cleanErr(e); msg.hidden = false;
  }
}
$("sendBtn").addEventListener("click", async () => {
  if (!lastPlan) return;
  const msg = $("sendMsg"); msg.hidden = true;
  $("sendBtn").disabled = true; $("sendBtn").textContent = "Waiting for approval…";
  try {
    const r = await S.invoke("send", { to: $("sendTo").value.trim(), amount: amountSats(), feeRate: Number($("feeRate").value), sendMax });
    msg.className = "msg ok";
    msg.innerHTML = `Sent. <a class="link" data-tx="${esc(r.txid)}">${esc(r.txid.slice(0, 16))}…</a>`;
    msg.querySelector("a").addEventListener("click", () => openUrl(state.explorerTx + r.txid));
    msg.hidden = false;
    $("sendTo").value = ""; $("sendAmt").value = ""; sendMax = false; $("sendMax").classList.remove("primary"); $("sendAmt").disabled = false;
    lastPlan = null;
  } catch (e) {
    const t = cleanErr(e);
    if (t !== "cancelled") { msg.className = "msg err"; msg.textContent = t; msg.hidden = false; }
    $("sendBtn").disabled = !lastPlan;
  } finally { $("sendBtn").textContent = "Send"; }
});

// ---- settings --------------------------------------------------------------
let settingsFilled = false;
function fillSettings() {
  if (!state) return;
  if (!settingsFilled) {
    $("setPath").value = state.accountPath || "";
    $("setServers").value = (state.servers || []).join("\n");
    settingsFilled = true;
  }
  $("serverHint").textContent = (state.customServers ? "Custom list." : "Bundled defaults.") + (state.server ? " Connected to " + hostOf(state.server) + "." : " Not connected.");
  $("purpose").textContent = "silentmode/addons/bchwallet/mainnet/0";
  renderSites();
}
async function renderSites() {
  let perms = {};
  try { perms = await S.invoke("permissions"); } catch {}
  const origins = Object.keys(perms).filter((o) => perms[o] && perms[o].readAddress);
  const el = $("sites");
  if (!origins.length) { el.innerHTML = `<div class="hint">None yet.</div>`; return; }
  el.innerHTML = origins.map((o) => `<div class="tx" style="grid-template-columns:1fr auto;cursor:default"><div class="mono">${esc(o)}</div><button class="btn sm" data-origin="${esc(o)}">Revoke</button></div>`).join("");
  el.querySelectorAll("button[data-origin]").forEach((b) => b.addEventListener("click", async () => {
    try { await S.invoke("revoke", { origin: b.dataset.origin }); renderSites(); } catch {}
  }));
}
$("applySettings").addEventListener("click", async () => {
  const msg = $("settingsMsg"); msg.hidden = true;
  try {
    const servers = $("setServers").value.split(/\n+/).map((s) => s.trim()).filter(Boolean);
    state = await S.invoke("setSettings", { accountPath: $("setPath").value, servers: state.customServers || servers.join() !== (state.servers || []).join() ? servers : undefined });
    settingsFilled = false; fillSettings(); render();
    flash($("applySettings"), "Applied");
  } catch (e) { msg.textContent = cleanErr(e); msg.hidden = false; }
});
$("resetServers").addEventListener("click", async () => {
  try { state = await S.invoke("setSettings", { servers: [] }); settingsFilled = false; fillSettings(); render(); } catch (e) { $("settingsMsg").textContent = cleanErr(e); $("settingsMsg").hidden = false; }
});
$("showXpub").addEventListener("click", async () => {
  try { const r = await S.invoke("recovery", {}); $("recovery").innerHTML = recoveryHtml(r); } catch (e) { $("recovery").textContent = cleanErr(e); }
});
$("showXprv").addEventListener("click", async () => {
  try { const r = await S.invoke("recovery", { reveal: true }); $("recovery").innerHTML = recoveryHtml(r); } catch (e) { $("recovery").textContent = cleanErr(e); }
});
function recoveryHtml(r) {
  let h = `<div class="lbl">Account path</div><div class="mono">${esc(r.accountPath)}</div><div class="lbl">Account xpub</div><div class="mono">${esc(r.xpub)}</div>`;
  if (r.xprv) h += `<div class="lbl">Account private key (xprv)</div><div class="mono" style="color:var(--danger)">${esc(r.xprv)}</div>`;
  return h;
}
const cleanErr = (e) => String(e?.message || e).replace(/^Error invoking remote method '[^']+': Error: /, "");
// Wipe a revealed key when the user leaves the Settings tab.
document.querySelectorAll("nav button").forEach((b) => b.addEventListener("click", () => { if (b.dataset.tab !== "settings") $("recovery").innerHTML = ""; }));

// ---- boot ------------------------------------------------------------------
S.on("state", (s) => { state = s; render(); });
(async () => {
  try { state = await S.invoke("state"); render(); }
  catch (e) { $("gate").hidden = false; $("gate").innerHTML = `<div class="big">⚠</div><div>${esc(cleanErr(e))}</div>`; }
})();