-- switch_creative mod by h3ndrik

switch_creative = {}

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

switch_creative.area_privs = {}

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

function switch_creative: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))
	
	switch_creative:set_area_privs(astore_id, "+creative, +fast, +fly")
end

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

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

function switch_creative:decode_privs_string(str)
	-- minetest/builtin/common/misc_helpers.lua:core.string_to_privs()
	assert(type(str) == "string")
	local 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
			privs_revoke[priv] = nil
		elseif toggle == '-' then
			privs_revoke[priv] = true
			privs_grant[priv] = nil
		end
	end
	return privs_grant, privs_revoke
end

function switch_creative: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 switch_creative:get_area_size(astore_area)
	local pos1 = astore_area.min
	local pos2 = astore_area.max
	local x = math.abs( pos2.x - pos1.x )
	local z = math.abs( pos2.z - pos1.x )
	return x*z
end

function switch_creative: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("switch_creative.saved_privs", minetest.serialize(privs))
end

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

function switch_creative:save_player_inventory(player, listname)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local inv = player:get_inventory()
	local player_items = inv:get_list("main")
	inv:set_list(listname, player_items)
end

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

function switch_creative:player_enter_area(player, privstring)
	local name = player:get_player_name()
	local has_creative = minetest.check_player_privs(name, {creative=true})
	
	local privs_grant, privs_revoke = switch_creative: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")
		switch_creative:save_player_inventory(player, "saved_survival")
		switch_creative:restore_player_inventory(player, "saved_creative")
		if minetest.get_modpath("unified_inventory") then
			unified_inventory.set_inventory_formspec(player, unified_inventory.default)
		end
	elseif has_creative and privs_revoke.creative then
		minetest.chat_send_player(name, "You entered survival mode")
		switch_creative:save_player_inventory(player, "saved_creative")
		switch_creative: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 switch_creative: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("switch_creative.active_areas")
	local player_last_active_areas = pmeta:get_string("switch_creative.active_areas") or "-1"
	local player_active_areas = "-1"
	local areas_owner = false
	local areas_guest = false
	local areas_open = false
	local new_area = nil
	local smallest_area = {}

	if minetest.check_player_privs(name, { protection_bypass=true }) then
		minetest.chat_send_player(name, "Changed area. You have protection_bypass priv")
		return
	end

	-- enter area
	local current_areas = self.astore:get_areas_for_pos(pos, true, true)
	for astore_id, astore_area in pairs( current_areas ) do
		local areasize = switch_creative:get_area_size(astore_area)
		if not smallest_area.size or areasize < smallest_area.size then
			smallest_area.id = astore_id
			smallest_area.size = areasize
		end
	end
	if smallest_area.id then
		player_active_areas = tostring(smallest_area.id)
	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
			player_active_areas = player_active_areas .. ", a"..a_id
			if a_area.owner == name then
				areas_owner = true
				break
			elseif a_area.open then
				areas_open = true
				break
			else
				areas_guest = true
				--continue
			end
		end
	end

	local privstring = default_privs
	if smallest_area.id and switch_creative.area_privs[smallest_area.id] then
		privstring = switch_creative.area_privs[smallest_area.id]
	end
	if areas_owner or areas_open then
		privstring = privstring .. ", " .. areas_owner_privs
	elseif areas_guest then
		privstring = privstring .. ", " .. areas_guest_privs
		for _, a in pairs(string.split(player_active_areas, ",")) do
			a = a:trim()
			if string.sub(a, 1, 1) == "a" then
				if switch_creative.area_privs[a] then
					privstring = privstring .. ", " .. switch_creative.area_privs[a]
				end
			end
		end
	end

	if player_active_areas ~= player_last_active_areas then
		switch_creative:player_enter_area(player, privstring)
		pmeta:set_string("switch_creative.active_areas", player_active_areas)
	end

--	print(dump(pmeta:to_table()))
end

switch_creative: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
			switch_creative: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 = switch_creative.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