web/server/routers/contentstack/metadata/utils.ts

import { getIntl } from "@/i18n"

import { RTETypeEnum } from "@/types/rte/enums"
import type { RawMetadataSchema } from "@/types/trpc/routers/contentstack/metadata"

export const affix = "metadata"

/**
 * Truncates the given text "intelligently" based on the last period found near the max length.
 *
 * - If a period exists within the extended range (`maxLength` to `maxLength + maxExtension`),
 *   the function truncates after the closest period to `maxLength`.
 * - If no period is found in the range, it truncates the text after the last period found in the max length of the text.
 * - If no periods exist at all, it truncates at `maxLength` and appends ellipsis (`...`).
 *
 * @param {string} text - The input text to be truncated.
 * @param {number} [maxLength=150] - The desired maximum length of the truncated text.
 * @param {number} [minLength=120] - The minimum allowable length for the truncated text.
 * @param {number} [maxExtension=10] - The maximum number of characters to extend beyond `maxLength` to find a period.
 * @returns {string} - The truncated text.
 */
function truncateTextAfterLastPeriod(
  text: string,
  maxLength: number = 150,
  minLength: number = 120,
  maxExtension: number = 10
): string {
  if (text.length <= maxLength) {
    return text
  }

  // Define the extended range
  const extendedEnd = Math.min(text.length, maxLength + maxExtension)
  const extendedText = text.slice(0, extendedEnd)

  // Find all periods within the extended range and filter after minLength to get valid periods
  const periodsInRange = [...extendedText.matchAll(/\./g)].map(
    ({ index }) => index
  )
  const validPeriods = periodsInRange.filter((index) => index + 1 >= minLength)

  if (validPeriods.length > 0) {
    // Find the period closest to maxLength
    const closestPeriod = validPeriods.reduce((closest, index) =>
      Math.abs(index + 1 - maxLength) < Math.abs(closest + 1 - maxLength)
        ? index
        : closest
    )
    return extendedText.slice(0, closestPeriod + 1)
  }

  // Fallback: If no period is found within the valid range, look for the last period in the truncated text
  const maxLengthText = text.slice(0, maxLength)
  const lastPeriodIndex = maxLengthText.lastIndexOf(".")
  if (lastPeriodIndex !== -1) {
    return text.slice(0, lastPeriodIndex + 1)
  }

  // Final fallback: Return maxLength text including ellipsis
  return `${maxLengthText}...`
}

export async function getTitle(data: RawMetadataSchema) {
  const intl = await getIntl()
  const metadata = data.web?.seo_metadata
  if (metadata?.title) {
    return metadata.title
  }
  if (data.hotelData) {
    return intl.formatMessage(
      { id: "Stay at HOTEL_NAME | Hotel in DESTINATION" },
      { hotelName: data.hotelData.name, destination: data.hotelData.city }
    )
  }
  if (data.web?.breadcrumbs?.title) {
    return data.web.breadcrumbs.title
  }
  if (data.heading) {
    return data.heading
  }
  if (data.header?.heading) {
    return data.header.heading
  }
  return ""
}

export async function getDescription(data: RawMetadataSchema) {
  const intl = await getIntl()
  const metadata = data.web?.seo_metadata
  if (metadata?.description) {
    return metadata.description
  }
  if (data.hotelData) {
    return data.hotelData.description
  }
  if (data.preamble) {
    return truncateTextAfterLastPeriod(data.preamble)
  }
  if (data.header?.preamble) {
    return truncateTextAfterLastPeriod(data.header.preamble)
  }
  if (data.blocks?.length) {
    const jsonData = data.blocks[0].content?.content?.json
    // Finding the first paragraph with text
    const firstParagraph = jsonData?.children?.find(
      (child) => child.type === RTETypeEnum.p && child.children[0].text
    )

    if (firstParagraph?.children?.length) {
      return firstParagraph.children[0].text
        ? truncateTextAfterLastPeriod(firstParagraph.children[0].text)
        : ""
    }
  }
  return ""
}

export function getImage(data: RawMetadataSchema) {
  const metadataImage = data.web?.seo_metadata?.seo_image
  const heroImage = data.hero_image

  // Currently we don't have the possibility to get smaller images from ImageVault (2024-11-15)
  if (metadataImage) {
    return {
      url: metadataImage.url,
      alt: metadataImage.meta.alt || undefined,
      width: metadataImage.dimensions.width,
      height: metadataImage.dimensions.height,
    }
  }
  if (data.hotelData?.image) {
    return data.hotelData.image
  }
  if (heroImage) {
    return {
      url: heroImage.url,
      alt: heroImage.meta.alt || undefined,
      width: heroImage.dimensions.width,
      height: heroImage.dimensions.height,
    }
  }
  return undefined
}