import path from 'path'
import Parent from '../base/serve.mjs'
import fs from 'fs/promises'
import fsSync from 'fs'
import dot from 'dot'
import config from '../base/config.mjs'
import AlphabeticID from './id.mjs'

export default class ServeHandler extends Parent {
  loadTemplate(indexFile) {
    this.template = dot.template(indexFile.toString(), { argName: [
      'imageLink',
      'videoLink',
      'error',
      'siteUrl',
      'siteUrlBase',
      'version',
      'nonce',
      'in_debug',
      'inputVideo',
      'inputImage'
    ] })
  }

  async serveIndex(ctx) {
    if (config.get('NODE_ENV') === 'development') {
      let indexFile = await fs.readFile(path.join(this.root, 'index.html'))
      this.loadTemplate(indexFile)
    }

    let videoLink = ctx.query.get('v') || ''
    let imageLink = ctx.query.get('i') || ''

    if (ctx.url.match(/^\/[a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9]+$/) && ctx.url.length < 7) {
      try {
        let id = AlphabeticID.decode(ctx.url.slice(1))
        if (id) {
          let res = await ctx.db.safeCallProc('discord_embed.link_get', [id - 3843])
          if (res.first.length) {
            ctx.state.video = res.first[0].video_link
            if (ctx.state.video.startsWith('https://cdn.discordapp.com')) {
              videoLink = ctx.state.video.replace('https://cdn.discordapp.com', 'https://discordproxy.nfp.is')
            } else {
              videoLink = this.frontend + '/video/' + ctx.url.slice(1) + '.webm'
            }
            imageLink = res.first[0].image_link
          } else {
            ctx.status = 404
          }
        }
      } catch (err) {
        ctx.log.error(err, 'Unable to fetch resource ' + ctx.url.slice(1))
        ctx.state.error = 'Unknown error while fetching link.'
      }
    } else if (ctx.url !== '/') {
      ctx.status = 404
    }

    let payload = {
      videoLink: videoLink,
      imageLink: imageLink,
      error: ctx.state.error || '',
      inputVideo: ctx.state.video || videoLink || '',
      inputImage: ctx.state.image || imageLink || '',
      siteUrl: this.frontend + ctx.url,
      siteUrlBase: this.frontend + '/',
      version: this.version,
      nonce: ctx.state.nonce,
      in_debug: config.get('NODE_ENV') === 'development' && false,
    }

    ctx.body = this.template(payload)
    ctx.type = 'text/html; charset=utf-8'
  }
}