// ABOUTME: PocketBase test harness for e2e tests - starts, configures, and stops PocketBase.
// ABOUTME: Provides ephemeral PocketBase instances with test data for Playwright tests.
import { type ChildProcess, execSync, spawn } from "node:child_process";
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import PocketBase from "pocketbase";
import {
  createCollection,
  getExistingCollectionNames,
  getMissingCollections,
} from "../scripts/setup-db";

/**
 * Configuration for the test harness.
 */
export interface HarnessConfig {
  port: number;
  adminEmail: string;
  adminPassword: string;
  testUserEmail: string;
  testUserPassword: string;
}

/**
 * Default configuration for e2e tests.
 */
export const DEFAULT_CONFIG: HarnessConfig = {
  port: 8091,
  adminEmail: "admin@e2e-test.local",
  adminPassword: "admin-password-e2e-123",
  testUserEmail: "e2e-test@phaseflow.local",
  testUserPassword: "e2e-test-password-123",
};

/**
 * State of a running PocketBase harness instance.
 */
export interface HarnessState {
  process: ChildProcess;
  dataDir: string;
  url: string;
  config: HarnessConfig;
}

let currentState: HarnessState | null = null;

/**
 * Gets the URL for the PocketBase instance.
 */
function getPocketBaseUrl(port: number): string {
  return `http://127.0.0.1:${port}`;
}

/**
 * Creates a temporary directory for PocketBase data.
 */
function createTempDataDir(): string {
  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "pocketbase-e2e-"));
  return tempDir;
}

/**
 * Waits for PocketBase to be ready by polling the health endpoint.
 */
async function waitForReady(url: string, timeoutMs = 30000): Promise<void> {
  const startTime = Date.now();
  const healthUrl = `${url}/api/health`;

  while (Date.now() - startTime < timeoutMs) {
    try {
      const response = await fetch(healthUrl);
      if (response.ok) {
        return;
      }
    } catch {
      // Server not ready yet, continue polling
    }
    await new Promise((resolve) => setTimeout(resolve, 100));
  }

  throw new Error(`PocketBase did not become ready within ${timeoutMs}ms`);
}

/**
 * Creates the admin superuser using the PocketBase CLI.
 */
function createAdminUser(
  dataDir: string,
  email: string,
  password: string,
): void {
  execSync(
    `pocketbase superuser upsert ${email} ${password} --dir=${dataDir}`,
    {
      stdio: "pipe",
    },
  );
}

/**
 * Adds custom fields to the users collection.
 */
async function addUserFields(pb: PocketBase): Promise<void> {
  const usersCollection = await pb.collections.getOne("users");

  // Define the custom user fields
  const customFields = [
    { name: "garminConnected", type: "bool" },
    { name: "garminOauth1Token", type: "text" },
    { name: "garminOauth2Token", type: "text" },
    { name: "garminTokenExpiresAt", type: "date" },
    { name: "calendarToken", type: "text" },
    { name: "lastPeriodDate", type: "date" },
    { name: "cycleLength", type: "number" },
    { name: "notificationTime", type: "text" },
    { name: "timezone", type: "text" },
    { name: "activeOverrides", type: "json" },
  ];

  // Get existing field names
  const existingFieldNames = new Set(
    (usersCollection.fields || []).map((f: { name: string }) => f.name),
  );

  // Filter to only new fields
  const newFields = customFields.filter((f) => !existingFieldNames.has(f.name));

  if (newFields.length > 0) {
    // Combine existing fields with new ones
    const allFields = [...(usersCollection.fields || []), ...newFields];

    await pb.collections.update(usersCollection.id, {
      fields: allFields,
    });
  }
}

/**
 * Sets up API rules for collections to allow user access.
 */
async function setupApiRules(pb: PocketBase): Promise<void> {
  // Allow users to read/write their own period_logs
  const periodLogs = await pb.collections.getOne("period_logs");
  await pb.collections.update(periodLogs.id, {
    listRule: "user = @request.auth.id",
    viewRule: "user = @request.auth.id",
    createRule: "user = @request.auth.id",
    updateRule: "user = @request.auth.id",
    deleteRule: "user = @request.auth.id",
  });

  // Allow users to read/write their own dailyLogs
  const dailyLogs = await pb.collections.getOne("dailyLogs");
  await pb.collections.update(dailyLogs.id, {
    listRule: "user = @request.auth.id",
    viewRule: "user = @request.auth.id",
    createRule: "user = @request.auth.id",
    updateRule: "user = @request.auth.id",
    deleteRule: "user = @request.auth.id",
  });
}

/**
 * Sets up the database collections using the SDK.
 */
async function setupCollections(pb: PocketBase): Promise<void> {
  // Add custom fields to users collection
  await addUserFields(pb);

  // Create period_logs and dailyLogs collections
  const existingNames = await getExistingCollectionNames(pb);
  const missing = getMissingCollections(existingNames);

  for (const collection of missing) {
    await createCollection(pb, collection);
  }

  // Set up API rules
  await setupApiRules(pb);
}

/**
 * Creates the test user with period data.
 */
async function createTestUser(
  pb: PocketBase,
  email: string,
  password: string,
): Promise<string> {
  // Calculate date 14 days ago for mid-cycle test data
  const fourteenDaysAgo = new Date();
  fourteenDaysAgo.setDate(fourteenDaysAgo.getDate() - 14);
  const lastPeriodDate = fourteenDaysAgo.toISOString().split("T")[0];

  // Create the test user
  const user = await pb.collection("users").create({
    email,
    password,
    passwordConfirm: password,
    emailVisibility: true,
    verified: true,
    lastPeriodDate,
    cycleLength: 28,
    timezone: "UTC",
  });

  // Create a period log entry
  await pb.collection("period_logs").create({
    user: user.id,
    startDate: lastPeriodDate,
  });

  return user.id;
}

/**
 * Starts a fresh PocketBase instance for e2e testing.
 */
export async function start(
  config: HarnessConfig = DEFAULT_CONFIG,
): Promise<HarnessState> {
  if (currentState) {
    throw new Error(
      "PocketBase harness is already running. Call stop() first.",
    );
  }

  const dataDir = createTempDataDir();
  const url = getPocketBaseUrl(config.port);

  // Start PocketBase process
  const pbProcess = spawn(
    "pocketbase",
    ["serve", `--dir=${dataDir}`, `--http=127.0.0.1:${config.port}`],
    {
      stdio: "pipe",
      detached: false,
    },
  );

  // Handle process errors
  pbProcess.on("error", (err) => {
    console.error("PocketBase process error:", err);
  });

  // Wait for PocketBase to be ready
  await waitForReady(url);

  // Create admin user via CLI
  createAdminUser(dataDir, config.adminEmail, config.adminPassword);

  // Connect to PocketBase as admin
  const pb = new PocketBase(url);
  pb.autoCancellation(false);
  await pb
    .collection("_superusers")
    .authWithPassword(config.adminEmail, config.adminPassword);

  // Set up collections
  await setupCollections(pb);

  // Create test user with period data
  await createTestUser(pb, config.testUserEmail, config.testUserPassword);

  currentState = {
    process: pbProcess,
    dataDir,
    url,
    config,
  };

  return currentState;
}

/**
 * Stops the running PocketBase instance and cleans up.
 */
export async function stop(): Promise<void> {
  if (!currentState) {
    return;
  }

  const { process: pbProcess, dataDir } = currentState;

  // Kill the PocketBase process
  pbProcess.kill("SIGTERM");

  // Wait a moment for graceful shutdown
  await new Promise((resolve) => setTimeout(resolve, 500));

  // Force kill if still running
  if (!pbProcess.killed) {
    pbProcess.kill("SIGKILL");
  }

  // Clean up the temporary data directory
  fs.rmSync(dataDir, { recursive: true, force: true });

  currentState = null;
}

/**
 * Gets the current harness state if running.
 */
export function getState(): HarnessState | null {
  return currentState;
}