// Integration test: boot ISO provisioning flow (for machines without PXE support).
//
// This test validates the ISO boot chain:
//   1. Bastion generates a boot ISO containing iPXE + embedded kernel/initrd
//   2. VM boots from the ISO (CD-ROM, not PXE)
//   3. iPXE loads from ISO, does DHCP, chains to bastion
//   4. Normal discover -> install flow follows
//
// This simulates machines like the MinisForum R1 that have no UEFI PXE ROM.
//
// Prerequisites: same as PXE test + xorriso, mtools
// Run: sudo pnpm run test:integration:iso

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

const VM_NAME = "lab-iso-test";
const VM_MEMORY = 4096;
const VM_VCPUS = 2;
const VM_DISK_GB = 250;      // LVM layout needs ~204GB. QCOW2 is sparse.
const HTTP_PORT = 8098;       // different from PXE test
const SSH_USER = "michal";
const BASTION_IP = PXE_GATEWAY;
const DHCP_RANGE_START = `${PXE_SUBNET}.100`;
const DHCP_RANGE_END = `${PXE_SUBNET}.200`;

const DISCOVERY_TIMEOUT_MS = 5 * 60_000;
const INSTALL_TIMEOUT_MS = 30 * 60_000;
const SSH_TIMEOUT_MS = 10 * 60_000;         // 10 min: OVMF retries PXE/HTTP Boot 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));
}

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 */ }
    await sleep(intervalMs);
  }
  throw new Error(`Timeout after ${timeoutMs}ms polling ${url}`);
}

describe("ISO boot provisioning", () => {
  let bastionApp: ReturnType<typeof import("fastify").default>;
  let testDir: string;
  let vmMac: string;
  let vmIp: string;
  let sshKeyPath: string;

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

    // 1. Network
    log("Setting up PXE test network (for ISO boot test)...");
    ensurePxeNetwork();

    // 2. Bastion dirs
    testDir = join(tmpdir(), `lab-iso-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 bastion with boot ISO generation
    log("Starting bastion with boot ISO generation...");

    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 { ensureBootIso } = await import("../../src/bastion/src/routes/boot-iso.js");
    const fs = await import("node:fs");
    const { execSync } = await import("node:child_process");

    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: "iso-test.local",
      sshKeys: [pubKey],
      adminUser: SSH_USER,
    });

    // iPXE for TFTP (still needed — dnsmasq points PXE clients here)
    const ipxeSrc = "/usr/share/ipxe/ipxe-snponly-x86_64.efi";
    if (fs.existsSync(ipxeSrc)) {
      fs.copyFileSync(ipxeSrc, join(config.tftpDir, "ipxe.efi"));
    }

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

    fs.copyFileSync(kernel, join(config.httpDir, "vmlinuz"));
    fs.copyFileSync(initrd, join(config.httpDir, "initrd.img"));
    try { fs.symlinkSync(join(config.tftpDir, "ipxe.efi"), join(config.httpDir, "ipxe.efi")); } catch { /* exists */ }

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

    // Generate the boot ISO — this is the key artifact for this test
    log("Generating boot ISO...");
    ensureBootIso(config);

    const isoPath = join(config.httpDir, "boot.iso");
    if (!fs.existsSync(isoPath)) {
      throw new Error("Boot ISO was not generated");
    }
    const isoSize = fs.statSync(isoPath).size;
    log(`Boot ISO generated: ${isoPath} (${(isoSize / 1024 / 1024).toFixed(1)}MB)`);

    // dnsmasq config + start
    generateDnsmasqConf(config);

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

    log("Starting dnsmasq (full DHCP)...");
    void startDnsmasq(config);
    await sleep(1000);

    // 4. Create VM that boots from the ISO (not PXE)
    log("Creating ISO boot VM (blank disk, UEFI, CD-ROM boot)...");
    createIsoVm({
      name: VM_NAME,
      memory: VM_MEMORY,
      vcpus: VM_VCPUS,
      diskSize: VM_DISK_GB,
      network: PXE_NETWORK_NAME,
      isoPath,
    });

    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
    log("Waiting for VM to boot ISO -> iPXE -> DHCP -> bastion -> 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 via ISO boot!");

    // 6. Queue install
    log("Queueing machine for install...");
    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: "", role: "vanilla" }),
    });

    // 7. Reboot for install
    log("Waiting for discovery reboot...");
    await sleep(15_000);
    rebootPxeVm(VM_NAME);

    // 8. Wait for install
    log("Waiting for install to complete (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") {
      const logsRes = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`);
      const logs = await logsRes.json();
      log(`INSTALL FAILED. State: ${JSON.stringify(logs, null, 2)}`);
      throw new Error("Install failed — check logs above");
    }

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

    // 9. Wait for SSH
    log("Waiting for SSH...");
    await waitForSsh(vmIp, SSH_USER, SSH_TIMEOUT_MS, sshKeyPath);
    log("ISO boot provision test setup complete.");

  }, DISCOVERY_TIMEOUT_MS + INSTALL_TIMEOUT_MS + SSH_TIMEOUT_MS + 120_000);

  afterAll(async () => {
    log("Cleaning up ISO test...");
    if (bastionApp) await bastionApp.close().catch(() => {});
    const { stopDnsmasq } = await import("../../src/bastion/src/services/dnsmasq.js");
    stopDnsmasq();
    destroyPxeVm(VM_NAME);
    destroyPxeNetwork();
    if (testDir) rmSync(testDir, { recursive: true, force: true });
  });

  it("machine was discovered and installed", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/machines`);
    const data = (await res.json()) as { installed: Record<string, { hostname: string }> };
    expect(data.installed[vmMac]).toBeDefined();
    expect(data.installed[vmMac].hostname).toBe(VM_NAME);
  });

  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 from kickstart", async () => {
    const res = await fetch(`http://${BASTION_IP}:${HTTP_PORT}/api/logs/${encodeURIComponent(vmMac)}`);
    const data = (await res.json()) as { log_total?: number };
    expect(data.log_total).toBeGreaterThan(0);
  });

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

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

  it("hostname is correct", () => {
    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 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");
  });

  it("LVM layout is correct", () => {
    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);
    }
  });
});