import type { Event } from 'nostr-tools'
import type { Series } from '@/types/nostr'
import { extractTagsFromEvent } from '../nostrTagSystem'
import { buildObjectId } from '../urlGenerator'
import { generateHashId } from '../hashIdGenerator'
import { mapNostrCategoryToLegacy, readSeriesInput, resolveObjectIdParts, type ExtractedTags } from './shared'

export async function parseSeriesFromEvent(event: Event): Promise<Series | null> {
  try {
    const tags = extractTagsFromEvent(event)
    const input = readSeriesInput({ tags, eventContent: event.content })
    if (!input) {
      return null
    }
    const category = mapNostrCategoryToLegacy(tags.category) ?? 'science-fiction'
    const { hash, version, index } = await resolveObjectIdParts({
      ...(input.idTag ? { idTag: input.idTag } : {}),
      defaultVersion: input.defaultVersion,
      defaultIndex: 0,
      generateHash: async (): Promise<string> =>
        generateHashId({
          type: 'series',
          pubkey: event.pubkey,
          title: input.title,
          description: input.description,
          category: input.categoryTag,
          coverUrl: input.coverUrl,
        }),
    })
    return buildSeriesFromParsed({ event, input, hash, version, index, category, tags })
  } catch (e) {
    console.error('Error parsing series:', e)
    return null
  }
}

function buildSeriesFromParsed(params: {
  event: Event
  input: { title: string; description: string; preview: string; coverUrl: string }
  hash: string
  version: number
  index: number
  category: Series['category']
  tags: ExtractedTags
}): Series {
  const id = buildObjectId(params.hash, params.index, params.version)
  const series: Series = {
    id,
    hash: params.hash,
    version: params.version,
    index: params.index,
    pubkey: params.event.pubkey,
    title: params.input.title,
    description: params.input.description,
    preview: params.input.preview,
    thumbnailUrl: params.input.coverUrl,
    category: params.category,
    ...(params.input.coverUrl ? { coverUrl: params.input.coverUrl } : {}),
  }
  series.kindType = 'series'
  return series
}