-- This file contains functions to convert from
-- the old areas format and other compatability code.

minetest.register_chatcommand("legacy_load_areas", {
	params = "<version>",
	description = "Loads, converts, and saves the areas from"
		.." a legacy save file.",
	privs = {areas=true, server=true},
	func = function(name, param)
		minetest.chat_send_player(name, "Converting areas...")
		local version = tonumber(param)
		if version == 0 then
			local err = areas:node_ownership_load()
			if err then
				minetest.chat_send_player(name, "Error loading legacy file: "..err)
				return
			end
		else
			minetest.chat_send_player(name, "Invalid version number. (0 allowed)")
			return
		end
		minetest.chat_send_player(name, "Legacy file loaded.")

		for k, area in pairs(areas.areas) do
			-- New position format
			area.pos1 = {x=area.x1, y=area.y1, z=area.z1}
			area.pos2 = {x=area.x2, y=area.y2, z=area.z2}

			area.x1, area.y1, area.z1,
			area.x2, area.y2, area.z2 =
				nil, nil, nil, nil, nil, nil

			-- Area positions sorting
			areas:sortPos(area.pos1, area.pos2)

			-- Add name
			area.name = "unnamed"

			-- Remove ID
			area.id = nil
		end
		minetest.chat_send_player(name, "Table format updated.")

		areas:save()
		minetest.chat_send_player(name, "Converted areas saved. Done.")
	end
})

function areas:node_ownership_load()
	local filename = minetest.get_worldpath().."/owners.tbl"
	local tables, err
	tables, err = loadfile(filename)
	if err then
		return err
	end

	tables = tables()
	for idx = 1, #tables do
		local tolinkv, tolinki = {}, {}
		for i, v in pairs(tables[idx]) do
			if type(v) == "table" and tables[v[1]] then
				table.insert(tolinkv, {i, tables[v[1]]})
			end
			if type(i) == "table" and tables[i[1]] then
				table.insert(tolinki, {i, tables[i[1]]})
			end
		end
		-- link values, first due to possible changes of indices
		for _, v in ipairs(tolinkv) do
			tables[idx][v[1]] = v[2]
		end
		-- link indices
		for _, v in ipairs(tolinki) do
			tables[idx][v[2]], tables[idx][v[1]] =  tables[idx][v[1]], nil
		end
	end
	self.areas = tables[1]
end

-- Returns the name of the first player that owns an area
function areas.getNodeOwnerName(pos)
	for id, area in pairs(areas:getAreasAtPos(pos)) do
		return area.owner
	end
	return false
end

-- Checks if a node is owned by you
function areas.isNodeOwner(pos, name)
	if minetest.check_player_privs(name, areas.adminPrivs) then
		return true
	end
	for id, area in pairs(areas:getAreasAtPos(pos)) do
		if name == area.owner then
			return true
		end
	end
	return false
end

-- Checks if an area has an owner
function areas.hasOwner(pos)
	for id, area in pairs(areas:getAreasAtPos(pos)) do
		return true
	end
	return false
end

IsPlayerNodeOwner = areas.isNodeOwner
GetNodeOwnerName  = areas.getNodeOwnerName
HasOwner          = areas.hasOwner

-- This is entirely untested and may break in strange and new ways.
if areas.config.legacy_table then
	owner_defs = setmetatable({}, {
		__index = function(table, key)
			local a = rawget(areas.areas, key)
			if not a then return a end
			local b = {}
			for k, v in pairs(a) do b[k] = v end
			b.x1, b.y1, b.z1 = b.pos1.x, b.pos1.y, b.pos1.z
			b.x2, b.y1, b.z2 = b.pos2.x, b.pos2.y, b.pos2.z
			b.pos1, b.pos2 = nil, nil
			b.id = key
			return b
		end,
		__newindex = function(table, key, value)
			local a = value
			a.pos1, a.pos2 = {x=a.x1, y=a.y1, z=a.z1},
					{x=a.x2, y=a.y2, z=a.z2}
			a.x1, a.y1, a.z1, a.x2, a.y2, a.z2 =
				nil, nil, nil, nil, nil, nil
			a.name = a.name or "unnamed"
			a.id = nil
			return rawset(areas.areas, key, a)
		end
	})
end