import nodemailer from "nodemailer";
import { getSettings, type NotificationEvents } from "./settingsStore.js";
import { enqueueNotification, listQueuedNotifications, clearQueuedNotifications } from "./notificationQueue.js";

// ─── Channel senders (best-effort — failures are logged, never thrown) ──────

async function sendGotify(title: string, message: string) {
  const { gotify } = await getSettings();
  if (!gotify.enabled || !gotify.url || !gotify.token) return;
  const base = gotify.url.replace(/\/$/, "");
  try {
    const res = await fetch(`${base}/message?token=${encodeURIComponent(gotify.token)}`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ title, message, priority: gotify.priority ?? 5 }),
    });
    if (!res.ok) console.error(`[notify] Gotify error ${res.status}: ${await res.text().catch(() => "")}`);
  } catch (err) {
    console.error("[notify] Gotify failed:", err instanceof Error ? err.message : err);
  }
}

async function sendNtfy(title: string, message: string) {
  const { ntfy } = await getSettings();
  if (!ntfy.enabled || !ntfy.url || !ntfy.topic) return;
  const base = ntfy.url.replace(/\/$/, "");
  const headers: Record<string, string> = {
    "Content-Type": "text/plain",
    Title: title,
    Priority: String(ntfy.priority ?? 3),
  };
  if (ntfy.token) headers.Authorization = `Bearer ${ntfy.token}`;
  try {
    const res = await fetch(`${base}/${encodeURIComponent(ntfy.topic)}`, { method: "POST", headers, body: message });
    if (!res.ok) console.error(`[notify] ntfy error ${res.status}: ${await res.text().catch(() => "")}`);
  } catch (err) {
    console.error("[notify] ntfy failed:", err instanceof Error ? err.message : err);
  }
}

async function sendSmtp(title: string, message: string) {
  const { smtp } = await getSettings();
  if (!smtp.enabled || !smtp.host || !smtp.to || !smtp.from) return;
  try {
    const transporter = nodemailer.createTransport({
      host: smtp.host,
      port: Number(smtp.port) || 587,
      secure: !!smtp.secure,
      auth: smtp.username ? { user: smtp.username, pass: smtp.password } : undefined,
    });
    await transporter.sendMail({ from: smtp.from, to: smtp.to, subject: title, text: message });
  } catch (err) {
    console.error("[notify] SMTP failed:", err instanceof Error ? err.message : err);
  }
}

async function sendWebhook(title: string, message: string) {
  const { webhook } = await getSettings();
  if (!webhook.enabled || !webhook.url) return;
  const headers: Record<string, string> = { "Content-Type": "application/json" };
  if (webhook.secret) headers["X-Webhook-Secret"] = webhook.secret;
  try {
    const res = await fetch(webhook.url, {
      method: "POST",
      headers,
      body: JSON.stringify({ content: `**${title}**\n${message}` }),
    });
    if (!res.ok) console.error(`[notify] Webhook error ${res.status}: ${await res.text().catch(() => "")}`);
  } catch (err) {
    console.error("[notify] Webhook failed:", err instanceof Error ? err.message : err);
  }
}

async function sendToChannels(title: string, message: string): Promise<void> {
  await Promise.all([sendGotify(title, message), sendNtfy(title, message), sendSmtp(title, message), sendWebhook(title, message)]);
}

function currentTimeInZone(timezone: string): { hh: number; mm: number } {
  const parts = new Intl.DateTimeFormat("en-GB", { timeZone: timezone, hour: "2-digit", minute: "2-digit", hour12: false }).formatToParts(
    new Date(),
  );
  return {
    hh: Number(parts.find((p) => p.type === "hour")?.value ?? "0"),
    mm: Number(parts.find((p) => p.type === "minute")?.value ?? "0"),
  };
}

function toMinutes(hhmm: string): number {
  const [h, m] = hhmm.split(":").map(Number);
  return (Number.isFinite(h) ? h : 0) * 60 + (Number.isFinite(m) ? m : 0);
}

async function isQuietHoursActive(): Promise<boolean> {
  const { quietHours, notifications } = await getSettings();
  if (!quietHours.enabled) return false;
  const { hh, mm } = currentTimeInZone(notifications.timezone);
  const nowMin = hh * 60 + mm;
  const startMin = toMinutes(quietHours.start);
  const endMin = toMinutes(quietHours.end);
  if (startMin === endMin) return false; // zero-length window — treat as always off
  // A same-day window (e.g. 09:00 -> 17:00) is a simple range; a window that
  // wraps past midnight (e.g. 22:00 -> 07:00, the common case) means "active"
  // is everything outside [end, start) instead.
  return startMin < endMin ? nowMin >= startMin && nowMin < endMin : nowMin >= startMin || nowMin < endMin;
}

export async function notify(title: string, message: string): Promise<void> {
  if (await isQuietHoursActive()) {
    await enqueueNotification(title, message);
    return;
  }
  await sendToChannels(title, message);
}

/** Called by the daily scheduler at quiet-hours end (or manually) — sends everything queued during the window as one digest, then clears it. */
export async function flushQuietHoursQueue(): Promise<number> {
  const queued = await listQueuedNotifications();
  if (queued.length === 0) return 0;
  const sections = queued.map((q) => `— ${q.title} —\n${q.message}`);
  await sendToChannels(
    "Homelab Manager — Notifications from quiet hours",
    `${queued.length} notification${queued.length !== 1 ? "s were" : " was"} held during quiet hours:\n\n${sections.join("\n\n")}`,
  );
  await clearQueuedNotifications();
  return queued.length;
}

// ─── Test senders — throw on failure so the route can report it ────────────

export async function testGotify(cfg: { url: string; token: string; priority?: number }): Promise<void> {
  const base = cfg.url.replace(/\/$/, "");
  const res = await fetch(`${base}/message?token=${encodeURIComponent(cfg.token)}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      title: "Homelab Manager — Test",
      message: "Gotify notifications are working correctly.",
      priority: cfg.priority ?? 5,
    }),
  });
  if (!res.ok) throw new Error(`Gotify returned ${res.status}: ${await res.text().catch(() => "")}`);
}

export async function testNtfy(cfg: { url: string; topic: string; token?: string; priority?: number }): Promise<void> {
  const base = cfg.url.replace(/\/$/, "");
  const headers: Record<string, string> = { "Content-Type": "text/plain", Title: "Homelab Manager — Test", Priority: String(cfg.priority ?? 3) };
  if (cfg.token) headers.Authorization = `Bearer ${cfg.token}`;
  const res = await fetch(`${base}/${encodeURIComponent(cfg.topic)}`, {
    method: "POST",
    headers,
    body: "ntfy notifications are working correctly.",
  });
  if (!res.ok) throw new Error(`ntfy returned ${res.status}: ${await res.text().catch(() => "")}`);
}

export async function testSmtp(cfg: {
  host: string;
  port?: number;
  secure?: boolean;
  username?: string;
  password?: string;
  from: string;
  to: string;
}): Promise<void> {
  const transporter = nodemailer.createTransport({
    host: cfg.host,
    port: Number(cfg.port) || 587,
    secure: !!cfg.secure,
    auth: cfg.username ? { user: cfg.username, pass: cfg.password } : undefined,
  });
  await transporter.verify();
  await transporter.sendMail({ from: cfg.from, to: cfg.to, subject: "Homelab Manager — Test", text: "SMTP notifications are working correctly." });
}

export async function testWebhook(cfg: { url: string; secret?: string }): Promise<void> {
  const headers: Record<string, string> = { "Content-Type": "application/json" };
  if (cfg.secret) headers["X-Webhook-Secret"] = cfg.secret;
  const res = await fetch(cfg.url, {
    method: "POST",
    headers,
    body: JSON.stringify({ content: "**Homelab Manager — Test**\nWebhook notifications are working correctly." }),
  });
  if (!res.ok) throw new Error(`Webhook returned ${res.status}: ${await res.text().catch(() => "")}`);
}

// ─── Event helpers ───────────────────────────────────────────────────────────

async function eventEnabled(key: keyof NotificationEvents): Promise<boolean> {
  const { notifications } = await getSettings();
  return notifications[key] !== false;
}

export async function notifyDnsRecordAdded(
  providerLabel: string,
  zoneName: string,
  record: { type: string; name: string; content: string },
): Promise<void> {
  if (!(await eventEnabled("dnsAdd"))) return;
  await notify("DNS Record Added", `[${providerLabel}] ${zoneName}\n+  ${record.type}  ${record.name}  →  ${record.content}`);
}

export async function notifyDnsRecordUpdated(
  providerLabel: string,
  zoneName: string,
  record: { type: string; name: string; content: string },
): Promise<void> {
  if (!(await eventEnabled("dnsUpdate"))) return;
  await notify("DNS Record Updated", `[${providerLabel}] ${zoneName}\n✎  ${record.type}  ${record.name}  →  ${record.content}`);
}

export async function notifyDnsRecordDeleted(
  providerLabel: string,
  zoneName: string,
  record: { type: string; name: string; content: string },
): Promise<void> {
  if (!(await eventEnabled("dnsDelete"))) return;
  await notify("DNS Record Deleted", `[${providerLabel}] ${zoneName}\n−  ${record.type}  ${record.name}  ${record.content}`);
}

export async function notifySecretExpiry(
  expiring: { name: string; status: "expired" | "expiring"; daysLeft: number }[],
): Promise<void> {
  if (expiring.length === 0) return;
  if (!(await eventEnabled("secretCheck"))) return;
  const lines = expiring.map((s) => (s.status === "expired" ? `✕ EXPIRED — ${s.name}` : `⚠ ${s.daysLeft}d left — ${s.name}`));
  await notify(
    "Homelab Manager — Secrets Alert",
    `${expiring.length} secret${expiring.length !== 1 ? "s" : ""} need attention:\n\n${lines.join("\n")}`,
  );
}

export async function notifyDockerUpdates(
  updatesAvailable: { integrationName: string; containerName: string; environmentName: string; newerVersion: string | null }[],
): Promise<void> {
  if (updatesAvailable.length === 0) return;
  if (!(await eventEnabled("dockerUpdateCheck"))) return;
  const lines = updatesAvailable.map(
    (u) => `${u.containerName} [${u.environmentName}, ${u.integrationName}]${u.newerVersion ? ` → ${u.newerVersion}` : ""}`,
  );
  await notify(
    "Homelab Manager — Docker Updates Available",
    `${updatesAvailable.length} container${updatesAvailable.length !== 1 ? "s have" : " has"} an image update available:\n\n${lines.join("\n")}`,
  );
}

export async function notifyProxmoxBackupFailure(
  failures: { integrationName: string; node: string; guestId: string | null; status: string }[],
): Promise<void> {
  if (failures.length === 0) return;
  if (!(await eventEnabled("proxmoxBackupCheck"))) return;
  const lines = failures.map(
    (f) => `${f.node}${f.guestId ? ` (guest ${f.guestId})` : ""} [${f.integrationName}]: ${f.status}`,
  );
  await notify(
    "Homelab Manager — Proxmox Backup Failed",
    `${failures.length} node${failures.length !== 1 ? "s have" : " has"} a failing most-recent backup run:\n\n${lines.join("\n")}`,
  );
}

export async function notifyProxmoxUncoveredGuests(
  uncovered: { integrationName: string; guestName: string; vmid: number; node: string }[],
): Promise<void> {
  if (uncovered.length === 0) return;
  if (!(await eventEnabled("proxmoxBackupCheck"))) return;
  const lines = uncovered.map((u) => `${u.guestName} (#${u.vmid}) on ${u.node} [${u.integrationName}]`);
  await notify(
    "Homelab Manager — Proxmox Guests Without Backup Coverage",
    `${uncovered.length} guest${uncovered.length !== 1 ? "s are" : " is"} not covered by any enabled backup job:\n\n${lines.join("\n")}`,
  );
}

export async function notifyTailscaleKeyExpiry(
  expiring: { integrationName: string; deviceLabel: string; daysLeft: number }[],
): Promise<void> {
  if (expiring.length === 0) return;
  if (!(await eventEnabled("tailscaleKeyCheck"))) return;
  const lines = expiring.map(
    (d) => `${d.daysLeft < 0 ? "✕ EXPIRED" : `⚠ ${d.daysLeft}d left`} — ${d.deviceLabel} [${d.integrationName}]`,
  );
  await notify(
    "Homelab Manager — Tailscale Key Expiry",
    `${expiring.length} device key${expiring.length !== 1 ? "s" : ""} need attention:\n\n${lines.join("\n")}`,
  );
}

// Diagnostic-log "source" values (see integrations/*/adapter.ts and dns/adapters/*.ts) to display names.
const SOURCE_LABELS: Record<string, string> = {
  cloudflare: "Cloudflare",
  loopia: "Loopia",
  pihole: "Pi-hole",
  azure: "Azure DNS",
  cpanel: "cPanel",
  technitium: "Technitium",
  tailscale: "Tailscale",
  proxmox: "Proxmox",
  synology: "Synology",
  semaphore: "Semaphore",
  gitea: "Gitea",
  dockhand: "Dockhand",
};

function sourceLabel(source: string): string {
  return SOURCE_LABELS[source] ?? source;
}

export async function notifyIntegrationDown(source: string, consecutiveFailures: number): Promise<void> {
  if (!(await eventEnabled("integrationFailureAlerts"))) return;
  await notify(
    "Homelab Manager — Integration Down",
    `${sourceLabel(source)} has failed its last ${consecutiveFailures} call${consecutiveFailures !== 1 ? "s" : ""} in a row. Check the Diagnostic Log for details.`,
  );
}

export async function notifyIntegrationRecovered(source: string): Promise<void> {
  if (!(await eventEnabled("integrationFailureAlerts"))) return;
  await notify("Homelab Manager — Integration Recovered", `${sourceLabel(source)} succeeded again after failing.`);
}