'use strict'

const Koa = require('koa')
const app = new Koa()

const streamify = require('stream-array')

const send = require('koa-send')
const responders = require('./responders.js')

const config = require('./modules/config.js')

const Router = require('koa-router')
const router = new Router()

app.context.getURL = router.url.bind(router)

const Posts = require('./modules/posts.js')
const posts = Posts.getFolder(config.posts.folder)

function toArrayStream (iterator) {
  return streamify(Array.from(iterator.entries()))
}

const postsStream = toArrayStream(posts)
router.get('home', '/', async function (ctx, next) {
  responders.home(ctx, config, postsStream)
})

router.get('post', '/post/:filename', async function (ctx, next) {
  ctx.assert(posts.has(ctx.params.filename), 404, 'Post not found')
  const post = posts.get(ctx.params.filename)
  post.body = Posts.render(post)

  responders.post(ctx, config, post)
})

const taxonomies = Posts.taxonomise(config.taxonomies, posts)
for (let [term, items] of taxonomies) {
  router.get(`taxon-${term}`, `/${term}/:value`, async function (ctx, next) {
    const value = ctx.params.value
    ctx.assert(
      items.has(ctx.params.value),
      404,
      `Could not find ${term} ${value}`
    )

    const taxonItems = toArrayStream(items.get(value))

    responders.taxon(ctx, config, taxonItems)
  })
}

app.use(router.routes()).use(router.allowedMethods())

const prefix = /^\/static\//
app.use(async function (ctx) {
  if (prefix.test(ctx.path)) {
    await send(ctx, ctx.path.replace(prefix, ''), {
      root: './static'
    })
  }
})

module.exports = app