module.exports = class {
  onCreate(input) {
    this.state = {
      characters: [],
      channels: [],
      eventNames: [],
      filters: [],
      search: "",
      activeMap: {
        events: {},
        characters: {},
        channels: {},
      },
    }
  }

  onInput(input) {
    this.update(input)
  }

  onMount(input) {
    this.getEl("search").addEventListener("keydown", ev => {
      if (this.waiting) {
        return
      }

      if (this.timeout != null) {
        clearTimeout(this.timeout)
      }

      if (ev.key === "Enter") {
        this.emit("add", "search", ev.target.value)
        this.getEl("search").value = ""
      }

      this.timeout = setTimeout(() => {
        this.timeout = null
        this.state.search = ev.target.value

        this.update(this.input)
      }, 200)
    })
  }

  update(input) {
    if (input.filter) {
      this.updateActive(input)
    }

    const search = this.state.search.toLocaleLowerCase()

    this.state.characters = input.characters.filter(c => !this.state.activeMap.characters[c.id]).filter(c => this.matches(c.name, search)).sort((a,b) => compareFilters(a.name, b.name, search))
    this.state.channels = input.channels.filter(c => !this.state.activeMap.channels[c.name]).filter(c => this.matches(c.name, search)).sort((a,b) => compareFilters(a.name, b.name, search))
    this.state.eventNames = input.eventNames.filter(e => !this.state.activeMap.events[e]).filter(e => this.matches(e, search)).sort((a,b) => compareFilters(a, b, search))
  }

  updateActive({filter, characters, channels, eventNames}) {
    const filters = []
    const activeMap = {
      events: {},
      characters: {},
      channels: {},
    }

    if (filter.search != null) {
      filters.push({
        type: "search",
        key: "search",
        icon: "T",
        color: "color-text",
        text: filter.search,
      })
    }

    for (const character of (filter.characters || [])) {
      activeMap.characters[character] = true

      filters.push({
        type: "characters",
        key: character,
        icon: "C",
        color: "color-tag-character",
        id: character,
        text: (characters.find(c => c.id === character) || {name: "Unknown ("+character+")"}).name,
      })
    }

    for (const channel of (filter.channels || [])) {
      activeMap.channels[channel] = true

      filters.push({
        type: "channels",
        key: channel.replace(/'/g, "__"),
        icon: "#",
        color: "color-tag-location",
        id: channel,
        text: channel,
      })
    }

    for (const event of (filter.events || [])) {
      activeMap.events[event] = true

      filters.push({
        type: "events",
        key: event.replace(/['\s\.]/g, "__"),
        icon: "E",
        color: "color-tag-event",
        id: event,
        text: event,
      })
    }

    this.state.filters = filters
    this.state.activeMap = activeMap
  }

  matches(str, search) {
    if (search == "") {
      return true
    }

    if (search.length > str.length) {
      return false
    }

    return str.toLowerCase().indexOf(search) !== -1
  }
}

/**
 * 
 * @param {string} a 
 * @param {string} b 
 * @param {string} search 
 */
function compareFilters(a, b, search) {
  if (search != "") {
    if (search.charAt(0) != "#" && a.charAt(0) == "#" && b.charAt(0) == "#") {
      search = '#' + search
    }

    const aStarts = a.toLocaleLowerCase().startsWith(search)
    const bStarts = b.toLocaleLowerCase().startsWith(search)
  
    if (aStarts && !bStarts) {
      return -1
    } else if (bStarts && !aStarts) {
      return 1
    }
  }

  return a.localeCompare(b)
}