local danbooru = {}

function danbooru:init(config)
  danbooru.triggers = {
	"^/dan$",
	"^/dan (d)$",
	"^/dan (w)$",
	"^/dan (m)$",
	"^/(dan) (.+)$",
	"(danbooru.donmai.us)/posts/([0-9]+)"
  }
  danbooru.doc = [[*
]]..config.cmd_pat..[[dan*: Zufälliges Bild von Danbooru
*]]..config.cmd_pat..[[dan* _<d/w/m>_: Zufälliges Bild von Danbooru (populär heute/in der Woche/im Monat)
*]]..config.cmd_pat..[[dan* _<Tags>_: Sucht auf Danbooru mit diesen Tags
]]
end

danbooru.command = 'dan <Tags>'

local BASE_URL = "http://danbooru.donmai.us"
local URL_NEW = "/posts.json"
local URL_POP = "/explore/posts/popular.json"

local scale_day = "?scale=day"
local scale_week = "?scale=week"
local scale_month = "?scale=month"

function danbooru:get_post(url)
  local res, code = http.request(url)
  if code ~= 200 then return nil end
  local posts = json.decode(res)
  if not posts[1] then return nil end

  return posts[math.random(#posts)]
end

function danbooru:get_specific_post(id)
  local url = BASE_URL..'/posts/'..id..'.json'
  local res, code = http.request(url)
  if code ~= 200 then return nil end
  local db = json.decode(res)
  local link_image = BASE_URL..db.file_url
  return link_image
end

function danbooru:action(msg, config, matches)
  if matches[1] == 'danbooru.donmai.us' and matches[2] then
    local url = danbooru:get_specific_post(matches[2])
	if not url then utilities.send_reply(self, msg, config.errors.connection) return end
	utilities.send_typing(self, msg.chat.id, 'upload_photo')
    local file = download_to_file(url)
	if string.ends(url, ".gif") or string.ends(url, ".zip") or string.ends(url, ".webm") then
	  utilities.send_document(self, msg.chat.id, file)
	else
	  utilities.send_photo(self, msg.chat.id, file)
	end
	return
  end


  if matches[1] == "d" or matches[1] == "w" or matches[1] == "m" then
    url = BASE_URL..URL_POP
  else
	url = BASE_URL..URL_NEW
  end

  if matches[1] == "d" then
	url = url..scale_day
  elseif matches[1] == "w" then
	url = url..scale_week
  elseif matches[1] == "m" then
	url = url..scale_month
  elseif matches[1] == "dan" and matches[2] then
	local tag = string.gsub(matches[2], " ", '_' )
	local tag = string.gsub(tag, ":", '%%3A' )
    url = url..'?tags='..tag
  end

  local post = danbooru:get_post(url)

  if post then
    local download_url = BASE_URL..post.large_file_url
	utilities.send_typing(self, msg.chat.id, 'upload_photo')
    local img = download_to_file(download_url)
	if string.ends(download_url, ".gif") or string.ends(download_url, ".zip") or string.ends(download_url, ".webm") then
	  utilities.send_document(self, msg.chat.id, img)
	else
	  utilities.send_photo(self, msg.chat.id, img)
	end

    local txt = ''
    if post.tag_string_artist ~= '' then
      txt = 'Artist: ' .. post.tag_string_artist .. '\n'
    end
    if post.tag_string_character ~= '' then
      txt = txt .. 'Charakter: ' .. post.tag_string_character .. '\n'
    end
    if post.file_size ~= '' then
      txt = txt .. '[' .. math.ceil(post.file_size/1000) .. 'kb] ' .. BASE_URL .. post.file_url
    end
	if txt ~= '' then
	  utilities.send_reply(self, msg, txt)
	end
	return
  else
    utilities.send_reply(self, msg, config.errors.results)
	return
  end
end

return danbooru