local app = require("lapis").Application()

local db = require("lapis.db")
local constants = require("constants")

local util = require("util")

local models = require("models")
local Posts = models.Posts
local Threads = models.Threads


app:get("single_post", "/:post_id", function(self)
  local query = constants.FULL_POSTS_QUERY .. "WHERE posts.id = ?"
  local p = db.query(query, self.params.post_id)
  if p then
    self.post = p[1]
    self.thread = Threads:find({id = self.post.thread_id})
    self.page_title = self.post.username .. "'s post in " .. self.thread.title
  end

  return {render = "post.single-post"}
end)

app:get("edit_post", "/:post_id/edit", function(self)
  local user = util.get_logged_in_user(self)
  if not user then
    return {redirect_to = self:url_for"all_topics"}
  end
  
  local editing_query = constants.FULL_POSTS_QUERY .. "WHERE posts.id = ?"
  local p = db.query(editing_query, self.params.post_id)
  if not p then
    return {redirect_to = self:url_for"all_topics"}
  end
  if p[1].user_id ~= user.id then
    return {redirect_to = self:url_for"all_topics"}
  end
  self.me = user
  self.editing_post = p[1]
  self.thread = Threads:find({id = self.editing_post.thread_id})
  
  local thread_predicate = constants.FULL_POSTS_QUERY .. "WHERE posts.thread_id = ?\n"
  
  local context_prev_query = thread_predicate .. "AND posts.created_at < ? ORDER BY posts.created_at DESC LIMIT 2"
  local context_next_query = thread_predicate .. "AND posts.created_at > ? ORDER BY posts.created_at ASC LIMIT 2"
  
  self.prev_context = db.query(context_prev_query, self.thread.id, self.editing_post.created_at)
  self.next_context = db.query(context_next_query, self.thread.id, self.editing_post.created_at)
  
  return {render = "post.edit-post"}
end)

app:post("edit_post", "/:post_id/edit", function(self)
  local user = util.get_logged_in_user(self)
  if not user then
    return {redirect_to = self:url_for("all_topics")}
  end
  
  local post = Posts:find({id = self.params.post_id})
  if not post then
    return {redirect_to = self:url_for("all_topics")}
  end
  
  if post.user_id ~= user.id then
    return {redirect_to = self:url_for("all_topics")}
  end
  
  util.update_post(post, self.params.new_content)
  local thread = Threads:find({id = post.thread_id})
  local link = self:url_for("thread", {slug = thread.slug}, {after = post.id}) .. "#post-" .. post.id
  return {redirect_to = link}
end)

return app