import { Handler } from 'aws-lambda'
import lunr, { Index } from 'lunr'

import idxJson from '../build/idx.json'
import { dbPost, initDatabase } from '../server/db'

let idx: Index

export const handler: Handler = async (evt) => {
  const { q = '', tag, page: _page = '1' } = evt.queryStringParameters || {}
  const perPage = 5
  const offset = (parseInt(_page) - 1) * perPage

  idx = idx || lunr.Index.load(idxJson)
  await initDatabase()

  let cond = dbPost.chain()

  if (q) {
    cond = cond.find({
      path: { $in: idx.search(q).map(({ ref }) => ref) },
    })
  }

  if (tag) {
    cond = cond.find({
      tag: { $contains: tag },
    })
  }

  const count = cond.branch().count()
  const result = cond
    .offset(offset)
    .limit(5)
    .data()
    .map(({ title, path, date, excerptHtml }) => ({
      title,
      path,
      date,
      excerptHtml,
    }))

  return {
    statusCode: 200,
    body: JSON.stringify({
      count,
      result,
    }),
  }
}