local sql = require("lsqlite3")

local db = require("db")
local queries = require("queries")
local util = require("util")
local tags = {}

local stmnt_get_tags, stmnt_ins_tag, stmnt_drop_tags

local oldconfigure = configure
function configure(...)
	--Tags for a story
	stmnt_ins_tag = assert(db.conn:prepare(queries.insert_tag))
	stmnt_get_tags = assert(db.conn:prepare(queries.select_tags))
	stmnt_drop_tags = assert(db.conn:prepare(queries.delete_tags))
	
	return oldconfigure(...)
end


function tags.get(id)
	local ret = {}
	stmnt_get_tags:bind_names{
		id = id
	}
	local err
	repeat
		err = stmnt_get_tags:step()
		if err == sql.BUSY then
			coroutine.yield()
		elseif err == sql.ROW then
			table.insert(ret,stmnt_get_tags:get_value(0))
		elseif err == sql.DONE then
			stmnt_get_tags:reset()
			return ret
		else
			error(string.format("Failed to get tags for story %d : %d", id, err))
		end
	until false
end

function tags.set(storyid,tags)
	assert(stmnt_drop_tags:bind_names{postid = storyid} == sql.OK)
	db.do_sql(stmnt_drop_tags)
	stmnt_drop_tags:reset()
	local err
	for _,tag in pairs(tags) do
		assert(stmnt_ins_tag:bind(1,storyid) == sql.OK)
		assert(stmnt_ins_tag:bind(2,tag) == sql.OK)
		err = db.do_sql(stmnt_ins_tag)
		stmnt_ins_tag:reset()
	end
	if err ~= sql.DONE then
		log(LOG_CRIT,"Failed to save tags on " .. storyid)
	end

end

return tags