local Luan = require "luan:Luan.luan"
local error = Luan.error
local ipairs = Luan.ipairs or error()
local Number = require "luan:Number.luan"
local long = Number.long or error()
local Db = require "site:/lib/Db.luan"
local run_in_transaction = Db.run_in_transaction or error()


local Post = {}

local function from_doc(doc)
	doc.type == "post" or error "wrong type"
	return Post.new {
		id = doc.id
		chat_id = doc.post_chat_id
		author_id = doc.author_id
		date = doc.post_date
		content = doc.content
		reply = doc.reply
	}
end

local function to_doc(post)
	return {
		type = "post"
		id = post.id
		post_chat_id = long(post.chat_id)
		author_id = long(post.author_id)
		post_date = long(post.date)
		content = post.content or error()
		reply = post.reply and long(post.reply)
	}
end

function Post.new(post)
	function post.save()
		local doc = to_doc(post)
		Db.save(doc)
		post.id = doc.id
	end

	function post.reload()
		return Post.get_by_id(post.id) or error(post.id)
	end

	function post.delete()
		run_in_transaction( function()
			local id = post.id
			Db.delete("id:"..id)
		end )
	end

	return post
end

function Post.search(query,sort,rows)
	rows = rows or 1000000
	local posts = {}
	local docs = Db.search(query,1,rows,{sort=sort})
	for _, doc in ipairs(docs) do
		posts[#posts+1] = from_doc(doc)
	end
	return posts
end

function Post.get_by_id(id)
	local doc = Db.get_document("id:"..id)
	return doc and doc.type=="post" and from_doc(doc) or nil
end

return Post