import type { Context } from "jsr:@hono/hono@4";
import { getCookie } from "jsr:@hono/hono@4/cookie";
import { sql } from "./db.ts";
import { valkey } from "./valkey.ts";

export interface AuthenticatedUser {
  userId: string;
  sessionId: string;
  username: string;
}

/**
 * Helper to get authenticated user from session cookie.
 * Checks Valkey cache first, with automatic PostgreSQL sessions table fallback.
 */
export async function getAuthenticatedUser(
  c: Context,
): Promise<AuthenticatedUser | null> {
  const sessionId = getCookie(c, "session_id");
  if (!sessionId) return null;

  // 1. Try Valkey cache
  try {
    const sessionDataStr = await valkey.get(sessionId);
    if (sessionDataStr) {
      const sessionData = JSON.parse(sessionDataStr);
      if (sessionData && sessionData.uuid) {
        return {
          userId: sessionData.uuid,
          sessionId,
          username: sessionData.username || "",
        };
      }
    }
  } catch (_err) {
    // Valkey cache miss or connection hiccup - fallback to DB
  }

  // 2. Fallback to PostgreSQL sessions table
  try {
    const session = await sql`
      SELECT s.user_id, s.expires_at, u.username
      FROM sessions s
      JOIN users u ON s.user_id = u.id
      WHERE s.id = ${sessionId} AND s.expires_at > NOW()
    `.then((res) => res[0]);

    if (session) {
      const username = session.username || "";
      // Repopulate Valkey in background
      try {
        const ttlSeconds = Math.max(
          1,
          Math.floor(
            (new Date(session.expires_at).getTime() - Date.now()) / 1000,
          ),
        );
        await valkey.setex(
          sessionId,
          ttlSeconds,
          JSON.stringify({ uuid: session.user_id, username }),
        );
      } catch (_e) {}
      return { userId: session.user_id, sessionId, username };
    }
  } catch (_err) {
    return null;
  }

  return null;
}

/**
 * Helper to check if user has global admin privileges.
 * Strict check: Requires an explicit 'admin' grant on the Management Console
 * or global role, or is the bootstrap root user.
 */
export async function isGlobalAdmin(userId: string): Promise<boolean> {
  try {
    // Check 1: User has an explicit 'admin' grant for the Auth-Yes Management Console or global app
    const adminGrant = await sql`
      SELECT g.id
      FROM grants g
      LEFT JOIN apps a ON g.app_id = a.id
      WHERE g.user_id = ${userId}
        AND g.role = 'admin'
        AND (
          a.spiffe_id = 'spiffe://system.local/auth-yes-management'
          OR a.name = 'Auth-Yes Management Console'
          OR g.app_id IS NULL
        )
    `.then((res) => res[0]);

    if (adminGrant) return true;

    // Check 2: First registered user in system fallback
    const firstUser = await sql`
      SELECT id FROM users ORDER BY created_at ASC LIMIT 1
    `.then((res) => res[0]);

    if (firstUser && firstUser.id === userId) {
      return true;
    }
  } catch (err) {
    console.error("[Auth API] isGlobalAdmin error:", err);
  }

  return false;
}