const { google } = require('#api');
const { paginator } = require('#client');

const { createEmbed, formatPaginationEmbeds, page } = require('#utils/embed')
const { link, citation, icon, stringwrap, codeblock, pill, smallPill } = require('#utils/markdown')
const { editOrReply } = require('#utils/message')
const { STATICS, STATIC_ICONS } = require('#utils/statics')

// TODO: Turn this into a general purpose permissions constant
const { Permissions } = require("detritus-client/lib/constants");
const { description } = require('../../interaction/slash/search/google');

function renderFooter(context, doodle){
  if(doodle.label) return {
    iconUrl: doodle.super_g,
    text: `${doodle.label} • Google Search`
  }
  
  return {
    iconUrl: STATICS.google,
    text: `Google Search • ${context.application.name}`
  }
}

// These have to be synced with the backend (search_service/endpoints/google).
const SEARCH_CARD_TYPES = {
  UNKNONW: 0,
  SEARCH_RESULT: 1,
  KNOWLEDGE_GRAPH: 2,
  DOODLE: 3,
  ENTITY: 4,
  CALCULATOR: 5,
  UNIT_CONVERTER: 6,
  DICTIONARY: 7,
  FUNBOX_COIN_FLIP: 10,
  FUNBOX_COLOR_PICKER: 11,
}

// TODO: create a favicon() util
function createSearchResultPage(context, result, doodle){
  let res;
  switch(result.type){
    case SEARCH_CARD_TYPES.SEARCH_RESULT:
      res = createEmbed("default", context, {
          author: {
            iconUrl: `https://www.google.com/s2/favicons?domain=${encodeURIComponent(result.url)}&sz=256`,
            name: result.title,
            url: result.url
          },
          description: result.content,
          footer: renderFooter(context, doodle)
        })

      if(result.thumbnail) res.thumbnail = { url: result.thumbnail };
    
      break;
    case SEARCH_CARD_TYPES.KNOWLEDGE_GRAPH:
      let header = result.card.title;
      if(result.card.url) header = link(result.card.url, result.card.title)
      res = createEmbed("default", context, {
          description: `### ${header}\n`,
          footer: renderFooter(context, doodle)
        })

      if(result.card.image) res.thumbnail = { url: result.card.image };
      if(result.card.description) res.description += `-# ${result.card.description}\n`
      if(result.card.content){
        let cnt = result.card.content.replace(/\n/g, '')
        if(cnt.endsWith(" ")) cnt = cnt.substr(0,cnt.length - 1)
        res.description += "\n" + cnt + citation(1, result.card.url, "Source")
      }
      break;
    case SEARCH_CARD_TYPES.DOODLE:
      res = createEmbed("default", context, {
        description: `### ${result.card.title}\n${result.card.description}\n\n${link(result.card.learn_more, `Learn More ${icon("link_open_external")}`, "Learn more about this Doodle")}`,
        thumbnail: {
          url: result.card.images.thumbnail 
        },
        image: {
          url: result.card.images.image
        },
        footer: renderFooter(context, doodle)
      })
      break;
    case SEARCH_CARD_TYPES.ENTITY:
      res = createEmbed("default", context, {
        author: {
          name: result.card.title
        },
        thumbnail: {
          url: result.card.images.thumbnail
        },
        description: '',
        footer: renderFooter(context, doodle)
      })

      if(!result.card.images.preview && result.card.link == ""){
        delete res.author
        res.description = `### ${result.card.title}\n`
      }

      if(result.card.type) res.description += `-# ${result.card.type}`

      if(result.card.color !== "") res.color = parseInt(result.card.color.substring(1,10), 16)

      if(result.card.description !== ""){
        res.description += "\n\n" + result.card.description
        if(result.card.source) res.description += citation(1, result.card.source, "Source") + "\n\n" + link(result.card.source, `Learn More ${icon("link_open_external")}`, "Learn more about this topic");
        else if(result.card.link !== "") res.description += "\n\n" + link(result.card.link, `Learn More ${icon("link_open_external")}`, "Learn more about this topic");
      }

      if(result.card.images.preview) res.author.iconUrl = result.card.images.preview;

      if(result.card.link) res.author.url = result.card.link

      break;
    case SEARCH_CARD_TYPES.CALCULATOR:
      res = createEmbed("default", context, {
        author: {
          name: result.query,
          iconUrl: STATIC_ICONS.search_calculator
        },
        description: codeblock("ansi",[result.result]),
        footer: renderFooter(context, doodle)
      })
      break;
    case SEARCH_CARD_TYPES.UNIT_CONVERTER:
      res = createEmbed("default", context, {
        author: {
          name: result.query,
          iconUrl: STATIC_ICONS.search_calculator
        },
        description: `### Unit Converter\n${smallPill(result.units[0])} ​ ​ ​​${icon("arrow_right")} ​ ​ ​ ​${pill(result.units[1])}`,
        footer: renderFooter(context, doodle)
      })
      break;
    case SEARCH_CARD_TYPES.FUNBOX_COIN_FLIP:
      res = createEmbed("default", context, {
        description: `### Flip a coin\n**${result.result}**!`,
        thumbnail: {
          url: result.sprite
        },
        footer: renderFooter(context, doodle)
      })
      break;
    case SEARCH_CARD_TYPES.FUNBOX_COLOR_PICKER:
      res = createEmbed("default", context, {
        description: `### ${result.card.title}\n${result.card.components.map((c)=>`${pill(c.label)}  ${smallPill(c.content)}`).join('\n')}`,
        thumbnail: {
          url: result.card.thumbnail
        },
        footer: renderFooter(context, doodle)
      })
      break;
    default:
      res = createEmbed("error", context, "Unknown GoogleResult Type: " + result.type)
      break;
  }
  return page(res);
}

module.exports = {
  name: 'google',
  label: 'query',
  aliases: ['g', 'search'],
  metadata: {
    description: 'Returns search results from Google.',
    description_short: 'Search on Google',
    examples: ['google Eurasian Small Clawed Otter'],
    category: 'search',
    usage: 'google <query>',
    slashCommand: "google"
  },
  permissionsClient: [Permissions.EMBED_LINKS, Permissions.SEND_MESSAGES, Permissions.USE_EXTERNAL_EMOJIS, Permissions.READ_MESSAGE_HISTORY],
  run: async (context, args) => {
    context.triggerTyping();
    if(!args.query) return editOrReply(context, createEmbed("warning", context, `Missing Parameter (query).`))
    try{
      let search = await google(context, args.query, context.channel.nsfw)
      search = search.response
     
      if(search.body.status == 2) return editOrReply(context, createEmbed("error", context, search.body.message))

      let pages = []
      for(const res of search.body.results){
        pages.push(createSearchResultPage(context, res, search.body.doodle))
      }

      if(!pages.length) return editOrReply(context, createEmbed("warning", context, `No results found.`))
      
      await paginator.createPaginator({
        context,
        pages: formatPaginationEmbeds(pages)
      });
    }catch(e){
      console.log(e)
      return editOrReply(context, createEmbed("error", context, `Unable to perform google search.`))
    }
  },
};