import path from 'path'
import sharp from 'sharp-lite'
import fs from 'fs/promises'
import { HttpError } from '../error.mjs'
import * as security from './security.mjs'
import * as formidable from './formidable.mjs'

export default class MediaRoutes {
  constructor(opts = {}) {
    Object.assign(this, {
      security: opts.security || security,
      formidable: opts.formidable || formidable,
      sharp: opts.sharp || sharp,
      fs: opts.fs || fs,
    })
    this.siteCache = new Map()
    this.collator = new Intl.Collator('is-IS', { numeric: false, sensitivity: 'accent' })
  }

  init() {
    return fs.readdir('./public').then(folders => {
      return Promise.all(folders.map(folder => {
        return fs.readdir('./public/' + folder)
          .then(files => {
            return Promise.all(files.map(file => {
              return fs.stat(`./public/${folder}/${file}`)
                .then(function(stat) {
                  return { name: file, size: stat.size }
                })
            }))
          })
          .then(files => {
            this.siteCache.set(folder, files)
          })
          .catch(function() {})
      }))
    })
  }

  filesCacheGet(site) {
    let files = this.siteCache.get(site) || []
    return files.sort((a, b) => {
      return this.collator.compare(a.name, b.name)
    })
  }

  filesCacheAdd(site, filename, size) {
    let arr = this.siteCache.get(site)
    if (!arr) {
      this.siteCache.set(site, arr = [])
    }
    arr.push({ name: filename, size: size })
  }

  async listFiles(ctx) {
    let site = await this.security.verifyToken(ctx)

    ctx.body = this.filesCacheGet(site)
  }
  
  async listPublicFiles(ctx) {
    this.security.throwIfNotPublic(ctx.params.site)

    ctx.body = this.filesCacheGet(ctx.params.site)
  }

  async upload(ctx) {
    let site = await this.security.verifyToken(ctx)
    ctx.state.site = site

    let result = await this.formidable.uploadFile(ctx, ctx.state.site)

    ctx.log.info(`Uploaded ${result.filename}`)

    let stat = await this.fs.stat(`./public/${ctx.state.site}/${result.filename}`)
    this.filesCacheAdd(ctx.state.site, result.filename, stat.size)

    ctx.body = {
      filename: result.filename,
      path: `/${ctx.state.site}/${result.filename}`
    }
  }

  async resize(ctx) {
    await this.upload(ctx)

    this.security.verifyBody(ctx)

    let out = {
      original: ctx.body,
    }

    let keys = Object.keys(ctx.req.body)

    await Promise.all(keys.map(key => {
      return Promise.resolve()
      .then(async () => {
        let item = ctx.req.body[key]
        let sharp = this.sharp(`./public/${ctx.state.site}/${ctx.body.filename}`)
          .rotate()
  
        if (item.resize) {
          sharp = sharp.resize(item.resize)
        }
        sharp = sharp[item.format](item[item.format])
  
        let target = ctx.body.filename
        if (path.extname(target).length > 0) {
          target = target.slice(0, -path.extname(target).length)
        }
        target += `_${key}.${item.format.replace('jpeg', 'jpg')}`
  
        if (item.out === 'base64') {
          let buffer = await sharp.toBuffer()
          out[key] = {
            base64: `data:image/${item.format};base64,` + buffer.toString('base64'),
          }
          return
        }
        await sharp.toFile(`./public/${ctx.state.site}/${target}`)
  
        let stat = await this.fs.stat(`./public/${ctx.state.site}/${target}`)
        this.filesCacheAdd(ctx.state.site, target, stat.size)
  
        out[key] = {
          filename: target,
          path: `/${ctx.state.site}/${target}`,
        }
      }).then(
        function() {},
        function(err) {
          throw new HttpError(`Error processing ${key}: ${err.message}`, 422)
        }
      )
    }))

    ctx.body = out
  }
}