import { Event } from 'nostr-tools'
import { getTagValue } from './nostr'
import { ModDetails } from '../types'

/**
 * Extracts and normalizes mod data from an event.
 *
 * This function extracts specific tag values from an event and maps them to properties
 * of a `PageData` object. It handles default values and type conversions as needed.
 *
 * @param event - The event object from which to extract data.
 * @returns A `Partial<PageData>` object containing extracted data.
 */
export const extractModData = (event: Event): ModDetails => {
  // Helper function to safely get the first value of a tag or return a default value
  const getFirstTagValue = (tagIdentifier: string, defaultValue = '') => {
    const tagValue = getTagValue(event, tagIdentifier)
    return tagValue ? tagValue[0] : defaultValue
  }

  // Helper function to safely parse integer values from tags
  const getIntTagValue = (tagIdentifier: string, defaultValue: number = -1) => {
    const tagValue = getTagValue(event, tagIdentifier)
    return tagValue ? parseInt(tagValue[0], 10) : defaultValue
  }

  return {
    author: event.pubkey,
    edited_at: event.created_at,
    body: event.content,
    site: getFirstTagValue('t'),
    published_at: getIntTagValue('published_at'),
    game: getFirstTagValue('game'),
    title: getFirstTagValue('title'),
    featuredImageUrl: getFirstTagValue('featuredImageUrl'),
    summary: getFirstTagValue('summary'),
    nsfw: Boolean(getFirstTagValue('nsfw')),
    screenshotsUrls: getTagValue(event, 'screenshotsUrls') || [],
    tags: getTagValue(event, 'tags') || [],
    downloadUrls: (getTagValue(event, 'downloadUrls') || []).map((item) =>
      JSON.parse(item)
    )
  }
}