-- toggle_areas mod by h3ndrik

toggle_areas = {}

local mod_storage = minetest.get_mod_storage()
toggle_areas.astore = AreaStore()

toggle_areas.area_privs = {}
toggle_areas.registered_on_enter = {}
toggle_areas.registered_on_leave = {}

areas_owner_privs = minetest.settings:get("toggle_areas.owner_privs") ~= "+creative, +fly, +fast"
areas_guest_privs = minetest.settings:get("toggle_areas.guest_privs") ~= "-fly, -fast"
default_privs = minetest.settings:get("toggle_areas.default_privs") ~= "+fast"

function toggle_areas:load_areas()
	local test = minetest.deserialize(mod_storage:get_string("astore"))
	local edge1 = { x=-10, y=-10, z=-10 }
	local edge2 = { x=10, y=10, z=10 }
	local data = "Testarea"
	local astore_id = self.astore:insert_area(edge1, edge2, tostring(data))
	
	self.set_area_privs(astore_id, "+fly, +fast, +creative")

	self.register_on_enter(astore_id, function(player)
		local name = player:get_player_name()
		local privs = minetest.get_player_privs(name)
		minetest.log("warning", "[toggle_areas] callback worked")
		privs.fly = true
		privs.fast = false
		minetest.set_player_privs(name, privs)
	end)
end

function toggle_areas:save_areas()
	local datastr = minetest.serialize(self.astore)
	if not datastr then
		minetest.log("error", "[toggle_areas] Failed to serialize area data!")
		return
	end
	mod_storage:set_string("astore", datastr)
end

function toggle_areas:register_on_enter(id, func)
	toggle_areas.registered_on_enter[id] = func
end

function toggle_areas:set_area_privs(id, privs_string)
	toggle_areas.area_privs[id] = privs_string
end

function toggle_areas:decode_privs_string(str)
	-- minetest/builtin/common/misc_helpers.lua:core.string_to_privs()
	assert(type(str) == "string")
	delim = ','
	local privs_grant = {}
	local privs_revoke = {}
	for _, priv in pairs(string.split(str, delim)) do
		priv = priv:trim()
		local toggle = string.sub(priv, 1, 1)
		priv = string.sub(priv, 2)
		if toggle == '+' then
			privs_grant[priv] = true
		elseif toggle == '-' then
			privs_revoke[priv] = true
		end
	end
	return privs_grant, privs_revoke
end

function toggle_areas:is_areas_mod(area_id)
	local is_areas_id = string.sub(id, 1, 2) == "a_"
	local a_id = tonumber( string.sub(id, 3) )
	return is_areas_id, a_id
end

function toggle_areas:get_area_size(area_id)

end

function toggle_areas:save_player_privs(player)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local privs = minetest.get_player_privs(name)
	pmeta:set_string("toggle_areas_privs", minetest.serialize(privs))
end

function toggle_areas:restore_player_privs(player)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local privs = minetest.deserialize(pmeta:get_string("toggle_areas_privs"))
	if privs then
		minetest.set_player_privs(name, privs)
		pmeta:set_string("toggle_areas_privs", nil)
	end
end

function toggle_areas:save_player_inventory(player, listname)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local inv = minetest.get_inventory({type="player", name=name})
	local player_items = inv:get_list("main")
	inv:set_list(listname, player_items)
end

function toggle_areas:restore_player_inventory(player, listname)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local inv = minetest.get_inventory({type="player", name=name})
	local player_items = inv:get_list(listname) or {}
	inv:set_list("main", player_items)
end

function toggle_areas:player_enter_area(player, privstring)
	local name = player:get_player_name()
	local has_creative = minetest.check_player_privs(name, {creative=true})
	
	privs_grant, privs_revoke = toggle_areas:decode_privs_string(privstring)

	if not has_creative and privs_grant.creative and not privs_revoke.creative then
		minetest.chat_send_player(name, "You entered creative mode")
		toggle_areas:save_player_inventory(player, "saved_survival")
		toggle_areas:restore_player_inventory(player, "saved_creative")	
	elseif has_creative and not privs_grant.creative then
		minetest.chat_send_player(name, "You entered survival mode")
		toggle_areas:save_player_inventory(player, "saved_creative")
		toggle_areas:restore_player_inventory(player, "saved_survival")
	end
	
	local has_privs = minetest.get_player_privs(name)
	local privs = has_privs
	for newpriv, _ in pairs(privs_grant) do
		privs[newpriv] = true
	end
	for newpriv, _ in pairs(privs_revoke) do
		privs[newpriv] = nil
	end
	minetest.set_player_privs(name, privs)

end

function toggle_areas:update_player(player)
	local name = player:get_player_name()
	local pos = vector.round(player:get_pos())

	local pmeta = player:get_meta()
--	pmeta:mark_as_private("toggle_areas")
	local player_stored_areas = minetest.deserialize(pmeta:get_string("toggle_areas")) or {}
	local areas_owner = false
	local areas_guest = false

	if minetest.check_player_privs(name, { protection_bypass=true }) then
		minetest.log("warning", "[toggle_areas] Player has protection_bypass priv")
		return
	end

	-- enter areas mod area
	local a_current_areas =  {}
	if minetest.get_modpath("areas") then
		a_current_areas = areas:getAreasAtPos(pos)
		for a_id, a_area in pairs( a_current_areas ) do
			if a_area.owner == name then
				areas_owner = true
			else
				areas_guest = true
			end
			if not player_stored_areas["a_"..a_id] then
				player_stored_areas["a_"..a_id] = true
				minetest.log("warning", "[toggle_areas] Player entered area a_"..tostring(a_id))

			end
		end
	end

	-- enter area
	local current_areas = self.astore:get_areas_for_pos(pos, false, true)
	for astore_id, astore_area in pairs( current_areas ) do
		if not player_stored_areas[astore_id] then
			player_stored_areas[astore_id] = true
			minetest.chat_send_player(name, "You entered area ["..tostring(astore_id).."] "..astore_area.data)
			minetest.log("warning", "[toggle_areas] Player entered area "..tostring(astore_id))
--			for i=1, #toggle_areas.registered_on_enter[astore_id] do
--				toggle_areas.registered_on_enter[astore_id][i](player)
--			end
		end
	end

	-- leave area
	for id, _ in pairs(player_stored_areas) do
		local is_areas_id, a_id = toggle_areas:is_areas_mod(id)
		if not is_areas_id and not current_areas[id] then
				player_stored_areas[id] = nil
				minetest.log("warning", "[toggle_areas] Player left area "..tostring(id))
--				for i=1, #toggle_areas.registered_on_leave[id] do
--					toggle_areas.registered_on_leave[id][i](player)
--				end
		end
		-- leave areas mod area
		if is_areas_id and not a_current_areas[a_id] then
				player_stored_areas[id] = nil
				minetest.log("warning", "[toggle_areas] Player left areas area "..tostring(id))
		end
	end
	
	local current_player_area = -1
	for id, _ in pairs(player_stored_areas) do
	
	end
	local privstring = toggle_areas.area_privs[area_id] or default_privs
	-- todo areas owner / guest

--	print(dump(pmeta:to_table()))
	pmeta:set_string("toggle_areas", minetest.serialize(player_stored_areas))
end

toggle_areas:load_areas()

local timer = 0
minetest.register_globalstep(function(dtime)
	timer = timer + dtime
	if timer >= 1 then
		for _, player in pairs(minetest.get_connected_players()) do
			toggle_areas:update_player(player)
		end
	end
end)

-- areas mod hud
if minetest.get_modpath("areas") then
	local function areas_hud_handler(pos, areas)
		local current_areas = toggle_areas.astore:get_areas_for_pos(pos, false, true)
		for astore_id, astore_area in pairs( current_areas ) do
			if astore_id then
				table.insert(areas, {
					id = "mod:"..astore_id,
					name = astore_area.data,
					--owner = "",
				})
			end
		end
	end

	areas:registerHudHandler(areas_hud_handler)
end