// Integration test: full PXE boot provisioning flow.
//
// This test validates the ENTIRE bastion flow end-to-end:
//   1. Starts the bastion (HTTP + dnsmasq) on an isolated libvirt network
//   2. Creates a blank UEFI VM that PXE boots
//   3. VM discovers itself via PXE -> bastion
//   4. We queue the machine for install
//   5. VM reboots, PXE boots again, installs Fedora via kickstart
//   6. Verifies: discovery, progress events, SSH access, installed state
//
// Prerequisites:
//   - libvirtd running
//   - OVMF firmware installed (sudo dnf install edk2-ovmf)
//   - iPXE packages installed (sudo dnf install ipxe-bootimgs-x86 ipxe-bootimgs-aarch64)
//   - sudo access
//   - Internet access (downloads Fedora kernel+initrd on first run)
//
// Run: sudo pnpm run test:integration:pxe

import { describe, it, expect, beforeAll, afterAll } from "vitest";
import { readFileSync, existsSync, mkdirSync, rmSync, copyFileSync, symlinkSync, writeFileSync } from "node:fs";
import { execSync } from "node:child_process";
import { join } from "node:path";
import { homedir, tmpdir } from "node:os";
import { log, waitForSsh } from "./helpers/libvirt.js";
import { ensurePxeNetwork, destroyPxeNetwork, PXE_NETWORK_NAME, PXE_GATEWAY, PXE_SUBNET } from "./helpers/pxe-network.js";
import { createPxeVm, destroyPxeVm, getVmMac, rebootPxeVm, setBootDisk } from "./helpers/pxe-vm.js";
import { sshExec } from "./helpers/ssh.js";

// --- Test constants ---
const VM_NAME = "lab-pxe-test";
const VM_MEMORY = 4096;     // 4GB (Anaconda needs ~2GB minimum)
const VM_VCPUS = 2;
const VM_DISK_GB = 250;      // LVM layout needs ~204GB (swap 27 + root 33 + var 100 + etc). QCOW2 is sparse.
const HTTP_PORT = 8099;      // Avoid conflicts with real bastion
const SSH_USER = "michal";   // Admin user created by kickstart
const BASTION_IP = PXE_GATEWAY; // 192.168.251.1
const DHCP_RANGE_START = `${PXE_SUBNET}.100`;
const DHCP_RANGE_END = `${PXE_SUBNET}.200`;

// Fedora install takes a while
const DISCOVERY_TIMEOUT_MS = 5 * 60_000;    // 5 min for PXE boot + discovery
const INSTALL_TIMEOUT_MS = 30 * 60_000;     // 30 min for full Fedora install
const SSH_TIMEOUT_MS = 10 * 60_000;         // 10 min: OVMF retries PXE/HTTP Boot (~3min) before disk boot + OS startup

function findSshKey(): { pubKey: string; keyPath: string } {
  const homes = [homedir()];
  const sudoUser = process.env["SUDO_USER"];
  if (sudoUser) homes.push(join("/home", sudoUser));
  if (process.env["SSH_KEY_PATH"]) {
    const keyPath = process.env["SSH_KEY_PATH"];
    const pubPath = `${keyPath}.pub`;
    if (existsSync(keyPath) && existsSync(pubPath)) {
      return { pubKey: readFileSync(pubPath, "utf-8").trim(), keyPath };
    }
  }
  for (const home of homes) {
    for (const name of ["id_ed25519", "id_ecdsa", "id_rsa"]) {
      const keyPath = join(home, ".ssh", name);
      const pubPath = `${keyPath}.pub`;
      if (existsSync(keyPath) && existsSync(pubPath)) {
        return { pubKey: readFileSync(pubPath, "utf-8").trim(), keyPath };
      }
    }
  }
  throw new Error("No SSH key found — set SSH_KEY_PATH or ensure keys exist in ~/.ssh/");
}

function sleep(ms: number): Promise<void> {
  return new Promise((r) => setTimeout(r, ms));
}

/** Poll the bastion API until a condition is met. */
async function pollApi<T>(
  url: string,
  check: (data: T) => boolean,
  timeoutMs: number,
  intervalMs = 5000,
): Promise<T> {
  const start = Date.now();
  while (Date.now() - start < timeoutMs) {
    try {
      const res = await fetch(url);
      if (res.ok) {
        const data = (await res.json()) as T;
        if (check(data)) return data;
      }
    } catch { /* bastion not ready yet or network hiccup */ }
    await sleep(intervalMs);
  }
  throw new Error(`Timeout after ${timeoutMs}ms polling ${url}`);
}

describe("PXE boot provisioning", () => {
  let bastionApp: { close: () => Promise<void> };
  let testDir: string;
  let vmMac: string;
  let vmIp: string;
  let sshKeyPath: string;
  let sshPubKey: string;

  beforeAll(async () => {
    const { pubKey, keyPath } = findSshKey();
    sshKeyPath = keyPath;
    sshPubKey = pubKey;

    // 1. Create isolated network (no DHCP — bastion provides it)
    log("Setting up PXE test network...");
    ensurePxeNetwork();

    // 2. Set up bastion directories and config
    testDir = join(tmpdir(), `lab-pxe-test-${Date.now()}`);
    mkdirSync(testDir, { recursive: true });
    mkdirSync(join(testDir, "tftp"), { recursive: true });
    mkdirSync(join(testDir, "http"), { recursive: true });
    mkdirSync(join(testDir, "logs"), { recursive: true });

    // 3. Start the bastion (HTTP server + dnsmasq)
    log("Starting bastion...");

    const { createApp } = await import("../../src/bastion/src/server.js");
    const { loadConfig } = await import("../../src/bastion/src/config.js");
    const { generateDnsmasqConf, startDnsmasq } = await import("../../src/bastion/src/services/dnsmasq.js");
    const { generateDiscoverKickstart } = await import("../../src/bastion/src/services/kickstart-generator.js");
    const { renderBootIpxe } = await import("../../src/bastion/src/templates/boot.ipxe.js");

    const config = loadConfig({
      bastionDir: testDir,
      httpPort: HTTP_PORT,
      iface: "virbr-pxe",
      serverIp: BASTION_IP,
      network: `${PXE_SUBNET}.0`,
      gateway: BASTION_IP,
      dhcpMode: "full",
      dhcpRangeStart: DHCP_RANGE_START,
      dhcpRangeEnd: DHCP_RANGE_END,
      domain: "pxe-test.local",
      sshKeys: [sshPubKey],
      adminUser: SSH_USER,
    });

    // Prepare boot artifacts
    log("Preparing boot artifacts (iPXE, kernel, initrd)...");

    // iPXE UEFI binary
    const ipxeSrc = "/usr/share/ipxe/ipxe-snponly-x86_64.efi";
    const ipxeDest = join(config.tftpDir, "ipxe.efi");
    if (!existsSync(ipxeSrc)) {
      throw new Error(`iPXE not found: ${ipxeSrc}. Install: sudo dnf install ipxe-bootimgs-x86`);
    }
    copyFileSync(ipxeSrc, ipxeDest);

    // Fedora kernel + initrd (cached across runs)
    const cacheDir = "/var/lib/libvirt/images/lab-pxe-cache";
    execSync(`mkdir -p "${cacheDir}"`, { stdio: "pipe" });

    const kernel = join(cacheDir, `vmlinuz-${config.fedoraVersion}`);
    const initrd = join(cacheDir, `initrd-${config.fedoraVersion}.img`);

    if (!existsSync(kernel)) {
      log(`Downloading Fedora ${config.fedoraVersion} kernel...`);
      execSync(`curl -# -L -f -o "${kernel}" "${config.fedoraMirror}/images/pxeboot/vmlinuz"`, { stdio: "inherit", timeout: 300_000 });
    } else {
      log("Fedora kernel cached");
    }
    if (!existsSync(initrd)) {
      log(`Downloading Fedora ${config.fedoraVersion} initrd...`);
      execSync(`curl -# -L -f -o "${initrd}" "${config.fedoraMirror}/images/pxeboot/initrd.img"`, { stdio: "inherit", timeout: 300_000 });
    } else {
      log("Fedora initrd cached");
    }

    copyFileSync(kernel, join(config.httpDir, "vmlinuz"));
    copyFileSync(initrd, join(config.httpDir, "initrd.img"));

    // Symlink iPXE into HTTP dir for UEFI HTTP Boot fallback
    try { symlinkSync(ipxeDest, join(config.httpDir, "ipxe.efi")); } catch { /* exists */ }

    // Generate boot scripts
    const discoverKs = generateDiscoverKickstart(config);
    writeFileSync(join(config.httpDir, "discover.ks"), discoverKs);
    const bootIpxe = renderBootIpxe({ serverIp: config.serverIp, httpPort: config.httpPort });
    writeFileSync(join(config.httpDir, "boot.ipxe"), bootIpxe);

    // Generate dnsmasq config
    generateDnsmasqConf(config);

    // Start HTTP server
    const { app, state } = createApp(config);
    bastionApp = app;
    await app.listen({ port: config.httpPort, host: "0.0.0.0" });
    log(`Bastion HTTP server listening on :${HTTP_PORT}`);

    // Start dnsmasq (fire-and-forget — it runs until killed)
    log("Starting dnsmasq (full DHCP mode)...");
    void startDnsmasq(config);
    // Give dnsmasq a moment to bind ports
    await sleep(1000);

    // 4. Create blank PXE-bootable VM
    log("Creating PXE VM (blank disk, UEFI boot)...");
    createPxeVm({
      name: VM_NAME,
      memory: VM_MEMORY,
      vcpus: VM_VCPUS,
      diskSize: VM_DISK_GB,
      network: PXE_NETWORK_NAME,
    });

    // Get the VM's MAC address (assigned by libvirt)
    const mac = getVmMac(VM_NAME);
    if (!mac) throw new Error("Could not determine VM MAC address");
    vmMac = mac;
    log(`VM MAC: ${vmMac}`);

    // 5. Wait for discovery — the VM PXE boots and calls /api/discover
    log("Waiting for VM to PXE boot and discover...");
    type MachinesResponse = { discovered: Record<string, unknown> };
    await pollApi<MachinesResponse>(
      `http://${BASTION_IP}:${HTTP_PORT}/api/machines`,
      (data) => vmMac in data.discovered,
      DISCOVERY_TIMEOUT_MS,
    );
    log("VM discovered!");

    // 6. Queue the machine for install
    log("Queueing machine for install...");
    const installRes = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/install`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        mac: vmMac,
        hostname: VM_NAME,
        disk: "",  // auto-detect
        role: "vanilla",  // fastest — skip k3s
      }),
    });
    const installResult = await installRes.json();
    log(`Install queued: ${JSON.stringify(installResult)}`);

    // 7. After discovery, the VM reboots (discovery kickstart does 'poweroff').
    //    Wait a bit and then start it again for the install boot.
    log("Waiting for discovery reboot cycle...");
    await sleep(15_000);

    // Force restart the VM (it should have shut down after discovery)
    rebootPxeVm(VM_NAME);

    // 8. Wait for install to complete
    log("Waiting for install to complete (this takes 10-20 minutes)...");
    type LogsResponse = { status: string; progress: string; ip?: string };
    const finalState = await pollApi<LogsResponse>(
      `http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`,
      (data) => data.status === "installed" || data.progress === "error",
      INSTALL_TIMEOUT_MS,
      10_000,
    );

    if (finalState.progress === "error") {
      // Grab logs for diagnostics
      const logsRes = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`);
      const logs = await logsRes.json();
      log(`INSTALL FAILED. Last state: ${JSON.stringify(logs, null, 2)}`);
      throw new Error("Install failed — check logs above");
    }

    vmIp = finalState.ip ?? "";
    log(`Install complete! VM IP: ${vmIp}`);

    // 9. Switch VM boot to disk (OVMF PXE/HTTP Boot loop prevents reaching installed OS)
    log("Switching VM boot order to disk...");
    await sleep(10_000); // Let kickstart reboot settle
    setBootDisk(VM_NAME);

    // 10. Wait for SSH
    log("Waiting for SSH access...");
    await waitForSsh(vmIp, SSH_USER, SSH_TIMEOUT_MS, sshKeyPath);

    log("PXE provision test setup complete.");
  }, DISCOVERY_TIMEOUT_MS + INSTALL_TIMEOUT_MS + SSH_TIMEOUT_MS + 120_000); // total timeout

  afterAll(async () => {
    log("Cleaning up...");

    // Stop bastion
    if (bastionApp) {
      await bastionApp.close().catch(() => {});
    }

    // Stop dnsmasq
    const { stopDnsmasq } = await import("../../src/bastion/src/services/dnsmasq.js");
    stopDnsmasq();

    // Destroy VM
    destroyPxeVm(VM_NAME);

    // Destroy network
    destroyPxeNetwork();

    // Clean up test dir
    if (testDir) {
      rmSync(testDir, { recursive: true, force: true });
    }
  });

  it("machine was discovered with hardware info", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/machines`);
    const data = (await res.json()) as { discovered: Record<string, { cpu_cores: number; memory_gb: number }> };
    // After install, machine moves from discovered to installed — check installed
    const machines = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/machines`);
    const all = (await machines.json()) as { installed: Record<string, { hostname: string }> };
    expect(all.installed[vmMac]).toBeDefined();
    expect(all.installed[vmMac].hostname).toBe(VM_NAME);
  });

  it("machine is in installed state with IP", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/machines`);
    const data = (await res.json()) as { installed: Record<string, { ip: string; role: string }> };
    const machine = data.installed[vmMac];
    expect(machine).toBeDefined();
    expect(machine.ip).toMatch(/^\d+\.\d+\.\d+\.\d+$/);
    expect(machine.role).toBe("vanilla");
  });

  it("progress stages were recorded", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`);
    const data = (await res.json()) as { status: string; progress: string };
    expect(data.status).toBe("installed");
    expect(data.progress).toBe("complete");
  });

  it("log lines were captured", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`);
    const data = (await res.json()) as { log_total?: number; log_lines?: Array<{ line: string }> };
    // Should have at least some log lines from the log streamer
    expect(data.log_total).toBeGreaterThan(0);
  });

  it("SSH works with admin user", () => {
    const result = sshExec(vmIp, SSH_USER, "whoami", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    expect(result.stdout.trim()).toBe(SSH_USER);
  });

  it("admin user has sudo access", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo whoami", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    expect(result.stdout.trim()).toBe("root");
  });

  it("hostname is set correctly", () => {
    const result = sshExec(vmIp, SSH_USER, "hostname -f", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    expect(result.stdout.trim()).toContain(VM_NAME);
  });

  it("provisioning metadata file exists", () => {
    const result = sshExec(vmIp, SSH_USER, "cat /etc/lab-provisioned", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    expect(result.stdout).toContain(`hostname: ${VM_NAME}`);
    expect(result.stdout).toContain("role: vanilla");
    expect(result.stdout).toContain(`bastion: ${BASTION_IP}`);
  });

  it("SSH root login is key-only", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo grep '^PermitRootLogin' /etc/ssh/sshd_config", { keyPath: sshKeyPath });
    expect(result.stdout).toContain("prohibit-password");
  });

  it("password auth is disabled", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo grep '^PasswordAuthentication' /etc/ssh/sshd_config", { keyPath: sshKeyPath });
    expect(result.stdout).toContain("no");
  });

  it("EFI boot order has Fedora first (local disk before PXE)", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo efibootmgr", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    // Boot order should start with the Fedora entry
    expect(result.stdout).toContain("BootOrder:");
  });

  it("tmpfs mount for /tmp is configured", () => {
    const result = sshExec(vmIp, SSH_USER, "grep tmpfs /etc/fstab", { keyPath: sshKeyPath });
    expect(result.stdout).toContain("tmpfs /tmp");
  });

  it("LVM volume group exists", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo vgs labvg", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    expect(result.stdout).toContain("labvg");
  });

  it("all expected LVM logical volumes exist", () => {
    const result = sshExec(vmIp, SSH_USER, "sudo lvs labvg --noheadings -o lv_name", { keyPath: sshKeyPath });
    expect(result.exitCode).toBe(0);
    const lvs = result.stdout.trim().split("\n").map((l: string) => l.trim());
    for (const expected of ["root", "var", "varlog", "swap", "home", "srv"]) {
      expect(lvs).toContain(expected);
    }
  });
});