posix = require 'posix'
json = require 'json'
http = require 'lcurl'

require 'tokyocabinet'
require 'corz'

CACHE = "/srv/tears/embed.db"

cache = tokyocabinet.bdbnew()
cache:open(CACHE, cache.OWRITER + cache.OREADER)

function userurl(basename, basecache, home, fallback)
  local path = ("/home/%s/%s"):format(home, basename)
  local cache = ("/srv/www/users/%s"):format(basecache)
  if not posix.stat(path) then return fallback end
  if not posix.stat(cache) then
    posix.unlink(cache)
    posix.link(path, cache, true)
  end
  return ("https://intern.radionova.no/users/%s"):format(basecache)
end

function userfile(basename, home, fallback)
  local path = ("/home/%s/%s"):format(home, basename)
  local ok, data = pcall(function()
    return io.open(path):read("*l")
  end)
  if ok then
    return data:gsub("[\r\n]*", "")
  else
    return fallback
  end
end

function oembed(endpoint, id)
  local url = endpoint .. id
  local cached = cache:get(id)
  if cached then
    local data = json.decode(cached)
    return data.html
  end

  local body = ""
  local result = http.easy{url=url, writefunction=function(s)
    body = body .. s
  end}:perform()
  if result:getinfo(http.INFO_RESPONSE_CODE) == 200 then
    cache:put(id, body)
    local data = json.decode(body)
    return "<div class=embed>" .. data.html .. "</div>"
  else
    return ("<b>Klarte ikke embedde %s :(</b>"):format(url)
  end
end

function twitter(id)
  return oembed("https://publish.twitter.com/oembed?url=", id)
end

function youtube(id)
  return oembed("http://www.youtube.com/oembed?url=", id)
end

function soundcloud(id)
  return oembed("https://soundcloud.com/oembed?format=json&url=", id)
end

function vimeo(id)
  return oembed("https://developer.vimeo.com/apis/oembed.json?url=", id)
end

function twitch(id)
  return oembed("https://api.twitch.tv/v4/oembed?url=", id)
end

function instagram(id)
  return oembed("https://api.instagram.com/oembed/?url=", id)
end

function flickr(id)
  return oembed("https://www.flickr.com/services/oembed?url=", id)
end

function facebook(id)
  return oembed("https://www.facebook.com/plugins/video/oembed.json?url=", id)
end


local function printf(...) io.write(string.format(...)) end

local function setfenv(fn, env)
  local i = 1
  while true do
    local name = debug.getupvalue(fn, i)
    if name == "_ENV" then
      debug.upvaluejoin(fn, i, (function()
        return env
      end), 1)
      break
    elseif not name then
      break
    end
    i = i + 1
  end
  return fn
end


local html = {}
function html.print(...)
  printf(...)
end
function html.tag(tag, options)
  options = options or {}
  local text = options.text; options.text = nil
  printf("<%s", tag)
  for k, v in pairs(options) do
    if v and v ~= "" then
      printf(" %s='%s'", k, v)
    else
      printf(" %s", k)
    end
  end
  printf(">")
  if text then
    printf(text or "")
    printf("</%s>", tag)
  end
  printf("\n")
end
function html.dl(facts)
  if #facts < 1 then return end
  printf("<dl>")
  for i,v in ipairs(facts) do
    local term, fact = v:match("^(.-)%s*:%s*(.-)$")
    html.tag("dt", { text=term })
    html.tag("dd", { text=fact })
  end
  printf("</dl>")
end
function html.label(options)
  options.text = options.text or error("no text")
  html.tag("label", options)
end
function html.orz(options)
  if options.inline then
    html.tag("a", { class = 'orz', text = 'orz'})
    return
  end
  local n = options.name or "orz"
  local v = options.value or "//:0"
  local uri = options.uri or "/orz/"
  html.tag('img', { class='orz', ['data-name']=n, src=v, ['data-uri']=uri})
  html.tag('input', { name=n, value=v, type='hidden'})
  html.tag('a', { class='orz', ['data-name']=n, ['data-uri']=uri, text='orz'})
end
function html.infobox(options)
  html.print("<ul class=infobox>")
  options.terms = options.terms or {}
  options.terms[''] = ""
  -- table.insert(options.terms, "")
  local n = options.name or "info[]"
  for k, v in ipairs(options.values) do
    html.print("<li>")
    local term, fact = v:match("^(.-)%s*:%s*(.-)$")
    html.select(n, options.terms, term)
    html.tag('input', { name=n, value=fact})
  end
  html.print("<li class=last>")
  html.select(n, options.terms, "")
  html.tag('input', { name=n })
  html.print("</ul>")
end
function html.date(options)
  local n = options.name or "date"
  local s = options.size or 10
  local v = options.value or ""
  html.tag('input', { type='date', name=n, size=s, value=v})
end
function html.text(options)
  local n = options.name or "text"
  local s = options.size or 18
  local v = options.value or ""
  html.tag("input", { type='text', name=n, size=s, value=v})
end
function html.hidden(options)
  local n = options.name or "hidden"
  local v = options.value or ""
  html.tag('input', { type='hidden', name=n, value=v})
end
function html.textarea(options)
  local n = options.name or "textarea"
  local v = (options.value or ""):gsub("[\n]$", "")
  local cols = options.cols or 72
  local rows = options.rows or 12
  html.tag('textarea', { name=n, cols=cols, rows=rows, text=v})
end
function html.select(k, options, selected)
  local p = ""
  printf("<select name='%s'>", k)
  for k,v in pairs(options) do
    if selected and selected == tostring(k) then
      p = "selected "
    end
    printf("<option %svalue='%s'>%s</option>", p, k, v)
    p = ""
  end
  printf("</select>")
end
function html.submit(value)
  printf("<input type=submit value='%s'>", value)
end
function html.img(options)
  html.tag('img', { src=options.src, alt=options.alt})
end
function html.p(options)
  html.tag("p", options)
end
function html.h1(...)
  printf("<h1>%s</h1>", ... or '')
end
function html.h2(...)
  printf("<h2>%s</h2>", ... or '')
end
function html.h3(...)
  printf("<h3>%s</h3>", ... or '')
end
function html.marxup(raw)
  corz.marxup(raw, io.output())
end

help = { html = html, os = os, posix = posix, pairs = pairs, ipairs = ipairs }

lupin = {}
lupin.blueprints = {}
lupin.blueprints.default = {
  pure = function(body, data)
    print(data.title)
    if data.type ~= "default" then
      printf("# type: %s\n", data.type)
    end
    data.title = nil
    data.type = nil
    print(body)
    for key, value in pairs(data) do
      if key == "info" then
        local term
        for i,v in ipairs(data.info) do
          if i % 2 == 1 then
            term = v
          else
            if #data.info >= i then print(("# info: %s: %s"):format(term, v)) end
          end
        end
      else
        print(("# %s: %s"):format(key, value))
      end
    end
  end,
  form = function(body, data)
    help.form.text('overskrift', data.title)
  end,
  html = function(body, data)
    if data.mode == "title" then
      printf("<h2>%s</h2>", data.title)
      return
    elseif data.mode == "full" then
      printf("<h1>%s</h1>", data.title)
    end
    corz.marxup(body, io.output())
    if not next(data) then return end
    print("<dl>")
    for key, value in pairs(data) do
      printf("<dt>%s</dt><dd>%s</dd>", key, value)
    end
    print("</dl>")
  end
}
function help.blueprint(id)
  return setmetatable({ id = id }, { __index = lupin.blueprints.default })
end

function lupin.loadblueprints(path)
  local blueprints = posix.glob(path .. "/*.lua")
  if blueprints then
    for i, file in pairs(blueprints) do
      local chunk = loadfile(file)
      setfenv(chunk, help)
      local blueprint = chunk()
      lupin.blueprints[blueprint.id] = blueprint
    end
  end
end

function lupin.transform(path, format, env, mode)
  if path ~= "-" then
    io.input(path)
  end

  local raw, data = "", {}

  data.info = {}
  if env then
    data.type = os.getenv("POST_type") or "default"
    data.title = os.getenv("POST_title") or "default"
    raw = os.getenv("POST_text") or ""
    raw = raw:gsub("\r\n", "\n")
    raw = raw:gsub("[\n]+$", "")
    raw = raw:match("(.-)%s*$")
    if lupin.blueprints[data.type] and lupin.blueprints[data.type].env then
      lupin.blueprints[data.type].env(data)
    end
    if os.getenv("POST_info") then
      for line in os.getenv("POST_info"):gmatch("[^\r\n]+") do
        table.insert(data.info, line)
      end
    end
  else
    for line in io.lines() do
      if line:match("^#") then
        local key, value = line:match("^#%s*(.-):%s*(.+)")
        if key and value and key == "info" then table.insert(data.info, value)
        elseif key and value then data[key] = value end
      else
        if not data.title then
          data.title = line
        else
          line = line:gsub("[\r\n]*", "")
          raw = raw .. line .. "\n"
        end
      end
    end
    data.type = data.type or "default"
  end
  data.mode = mode
  if data.mode == "short" then
    raw = data.lead or raw:match("[^\r\n]+")
  end
  if path ~= "-" then
    local stat = posix.stat(path)
    local pwd = posix.getpasswd(stat.uid)

    data.author = pwd.name
    data.authorname = userfile("navn", data.author, data.author)

    data.group = posix.getgroup(stat.gid).name
    data.groupname = userfile("navn", data.group, data.group)

    if data.published then
      data.date = os.date("%A %d. %B %Y, kl. %H.%M", data.published)
    else
      local root = "/srv/www/happiest.place/tears/artikler"
      y, m, d = path:match(root .. "/(.*)/(.*)/(.*)/(.*)")
      data.date = ("%s/%s/%s"):format(y, m, d)
    end

    data.portrait = userurl("selfie.jpg", data.author .. ".jpg", data.author)
  end

  if format == "later" then
    data.raw = raw
    local info = data.info
    data.info = {}
    for i,v in ipairs(info) do
      local term, fact = v:match("^(.-)%s*:%s*(.-)$")
      table.insert(data.info, { term = term, fact = fact })
    end
    data.text = function()
      local f = io.tmpfile()
      corz.marxup(data.raw, f)
      f:seek("set")
      local result = f:read("*a")
      result = result:gsub("$%s*twitter:%s*(.-)\n", twitter)
      result = result:gsub("$%s*youtube:%s*(.-)\n", youtube)
      result = result:gsub("$%s*soundcloud:%s*(.-)\n", soundcloud)
      result = result:gsub("$%s*twitch:%s*(.-)\n", twitch)
      result = result:gsub("$%s*vimeo:%s*(.-)\n", vimeo)
      result = result:gsub("$%s*instagram:%s*(.-)\n", instagram)
      result = result:gsub("$%s*flickr:%s*(.-)\n", flickr)
      result = result:gsub("$%s*facebook:%s*(.-)\n", facebook)
      return result
    end
    return data
  end

  lupin.blueprints[data.type][format](raw, data)
end