import { Controller } from 'stimulus'
import { Liquid } from 'liquidjs'

const lunr = require("lunr")
require("lunr-languages/lunr.stemmer.support")(lunr)
require("lunr-languages/lunr.es")(lunr)

export default class extends Controller {
  static targets = [ 'q' ]

  get q () {
    if (!this.hasQTarget) return
    if (!this.qTarget.value.trim().length === 0) return

    return this.qTarget.value.trim().replace(':', '')
  }

  connect () {
    const q = new URLSearchParams(window.location.search).get('q').trim()

    if (q) {
      this.qTarget.value = q
      this.search()
    }
  }

  async search (event) {
    // Detiene el envío del formulario
    if (event) {
      event.preventDefault()
      event.stopPropagation()
    }

    this.formDisable = true

    // Obtiene el término de búsqueda
    const q = this.q
    // Si no hay término de búsqueda, no hay búsqueda
    if (q) {
      // Trae el índice de búsqueda
      await this.fetch()

      // Hasta que no haya índice no buscamos nada, esto evita que se
      // aprete enter dos veces y se fallen cosas.
      if (!window.index) return
    }

    const main = document.querySelector('main')
    const results = window.index.search(q).map(r => window.data.find(a => a.id == r.ref))
    const site = await this.site()
    const request = await fetch('assets/templates/results.html')
    const template = await request.text()
    const html = await this.engine.parseAndRender(template, { q, site, results })
    const title = `${site.i18n.search.title} - ${q}`
    const query = new URLSearchParams({ q })

    window.history.pushState({ q }, title, `?${query.toString()}`)
    document.title = title

    main.innerHTML = html
    this.formDisable = false
  }

  async fetch () {
    // Solo permite descargar uno a la vez
    if (this.fetching) return

    this.fetching = true
    let response

    // Si no existe el índice, lo descarga y procesa Lunr
    if (!window.data) {
      response = await fetch('data.json')
      window.data = await response.json()
    }

    if (!window.index) {
      response = await fetch('idx.json')
      const idx = await response.json()
      window.index = lunr.Index.load(idx)
    }

    // Permitir volver a ejecutar
    this.fetching = false
  }

  set formDisable (disable) {
    this.element.elements.forEach(x => x.disabled = disable)
  }

  /*
   * Liquid renderer
   *
   * @return Liquid
   */
  get engine () {
    if (!window.liquid) window.liquid = new Liquid()

    return window.liquid
  }

  async site () {
    if (!window.site) {
      const data = await fetch('assets/data/site.json')
      window.site = await data.json()
    }

    return window.site
  }
}