import { db } from "../db";
import { clients, tags as tagsTable } from "../db/schema";
import { eq, and } from "drizzle-orm";

export const MAX_LENGTHS = {
  name: 255,
  email: 320,
  password: 128,
  phone: 50,
  address: 255, // street, city, state, zip, country
  currency: 10,
  invoiceNumber: 50,
  invoiceNotes: 5000,
  itemDescription: 2000,
  description: 2000, // time entry description
} as const;

export function exceedsLength(
  field: string,
  value: string | null | undefined,
  maxLength: number,
): string | null {
  if (value && value.length > maxLength) {
    return `${field} must be ${maxLength} characters or fewer`;
  }
  return null;
}

export async function validateTimeEntryResources({
  organizationId,
  clientId,
  tagId,
}: {
  organizationId: string;
  clientId: string;
  tagId?: string | null;
}) {
  const client = await db
    .select()
    .from(clients)
    .where(
      and(eq(clients.id, clientId), eq(clients.organizationId, organizationId)),
    )
    .get();

  if (!client) {
    return { valid: false, error: "Invalid client" };
  }

  if (tagId) {
    const validTag = await db
      .select()
      .from(tagsTable)
      .where(
        and(
          eq(tagsTable.id, tagId),
          eq(tagsTable.organizationId, organizationId),
        ),
      )
      .get();

    if (!validTag) {
      return { valid: false, error: "Invalid tag" };
    }
  }

  return { valid: true };
}

export function validateTimeRange(
  start: string | number | Date,
  end: string | number | Date,
) {
  const startDate = new Date(start);
  const endDate = new Date(end);

  if (isNaN(startDate.getTime()) || isNaN(endDate.getTime())) {
    return { valid: false, error: "Invalid date format" };
  }

  if (endDate <= startDate) {
    return { valid: false, error: "End time must be after start time" };
  }

  return { valid: true, startDate, endDate };
}

const EMAIL_REGEX = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

export function isValidEmail(email: string): boolean {
  return EMAIL_REGEX.test(email) && email.length <= 320;
}