local S = minetest.get_translator("areas")

minetest.register_chatcommand("protect", {
	params = S("<AreaName>"),
	description = S("Protect your own area"),
	privs = {[areas.config.self_protection_privilege]=true},
	func = function(name, param)
		if param == "" then
			return false, S("Invalid usage, see /help @1.", "protect")
		end
		local pos1, pos2 = areas:getPos(name)
		if not (pos1 and pos2) then
			return false, S("You need to select an area first.")
		end

		minetest.log("action", "/protect invoked, owner="..name..
				" AreaName="..param..
				" StartPos="..minetest.pos_to_string(pos1)..
				" EndPos="  ..minetest.pos_to_string(pos2))

		local canAdd, errMsg = areas:canPlayerAddArea(pos1, pos2, name)
		if not canAdd then
			return false, S("You can't protect that area: @1", errMsg)
		end

		local id = areas:add(name, param, pos1, pos2, nil)
		areas:save()

		return true, S("Area protected. ID: @1", id)
	end
})


minetest.register_chatcommand("set_owner", {
	params = S("<PlayerName>").." "..S("<AreaName>"),
	description = S("Protect an area between two positions and give"
		.." a player access to it without setting the parent of the"
		.." area to any existing area"),
	privs = areas.adminPrivs,
	func = function(name, param)
		local ownerName, areaName = param:match('^(%S+)%s(.+)$')

		if not ownerName then
			return false, S("Invalid usage, see /help @1.", "set_owner")
		end

		local pos1, pos2 = areas:getPos(name)
		if not (pos1 and pos2) then
			return false, S("You need to select an area first.")
		end

		if not areas:player_exists(ownerName) then
			return false, S("The player \"@1\" does not exist.", ownerName)
		end

		minetest.log("action", name.." runs /set_owner. Owner = "..ownerName..
				" AreaName = "..areaName..
				" StartPos = "..minetest.pos_to_string(pos1)..
				" EndPos = "  ..minetest.pos_to_string(pos2))

		local id = areas:add(ownerName, areaName, pos1, pos2, nil)
		areas:save()

		minetest.chat_send_player(ownerName,
				S("You have been granted control over area #@1. "..
				"Type /list_areas to show your areas.", id))
		return true, S("Area protected. ID: @1", id)
	end
})


minetest.register_chatcommand("add_owner", {
	params = S("<ParentID>").." "..S("<PlayerName>").." "..S("<AreaName>"),
	description = S("Give a player access to a sub-area between two"
		.." positions that have already been protected,"
		.." Use set_owner if you don't want the parent to be set."),
	func = function(name, param)
		local pid, ownerName, areaName = param:match('^(%d+) ([^ ]+) (.+)$')

		if not pid then
			minetest.chat_send_player(name, S("Invalid usage, see /help @1.", "add_owner"))
			return
		end

		local pos1, pos2 = areas:getPos(name)
		if not (pos1 and pos2) then
			return false, S("You need to select an area first.")
		end

		if not areas:player_exists(ownerName) then
			return false, S("The player \"@1\" does not exist.", ownerName)
		end

		minetest.log("action", name.." runs /add_owner. Owner = "..ownerName..
				" AreaName = "..areaName.." ParentID = "..pid..
				" StartPos = "..pos1.x..","..pos1.y..","..pos1.z..
				" EndPos = "  ..pos2.x..","..pos2.y..","..pos2.z)

		-- Check if this new area is inside an area owned by the player
		pid = tonumber(pid)
		if (not areas:isAreaOwner(pid, name)) or
		   (not areas:isSubarea(pos1, pos2, pid)) then
			return false, S("You can't protect that area.")
		end

		local id = areas:add(ownerName, areaName, pos1, pos2, pid)
		areas:save()

		minetest.chat_send_player(ownerName,
				S("You have been granted control over area #@1. "..
				"Type /list_areas to show your areas.", id))
		return true, S("Area protected. ID: @1", id)
	end
})


minetest.register_chatcommand("rename_area", {
	params = S("<ID>").." "..S("<newName>"),
	description = S("Rename an area that you own"),
	func = function(name, param)
		local id, newName = param:match("^(%d+)%s(.+)$")
		if not id then
			return false, S("Invalid usage, see /help @1.", "rename_area")
		end

		id = tonumber(id)
		if not id then
			return false, S("That area doesn't exist.")
		end

		if not areas:isAreaOwner(id, name) then
			return true, S("You don't own that area.")
		end

		areas.areas[id].name = newName
		areas:save()
		return true, S("Area renamed.")
	end
})


minetest.register_chatcommand("find_areas", {
	params = "<regexp>",
	description = S("Find areas using a Lua regular expression"),
	privs = areas.adminPrivs,
	func = function(name, param)
		if param == "" then
			return false, S("A regular expression is required.")
		end

		-- Check expression for validity
		local function testRegExp()
			("Test [1]: Player (0,0,0) (0,0,0)"):find(param)
		end
		if not pcall(testRegExp) then
			return false, S("Invalid regular expression.")
		end

		local matches = {}
		for id, area in pairs(areas.areas) do
			local str = areas:toString(id)
			if str:find(param) then
				table.insert(matches, str)
			end
		end
		if #matches > 0 then
			return true, table.concat(matches, "\n")
		else
			return true, S("No matches found.")
		end
	end
})


minetest.register_chatcommand("list_areas", {
	params = S("[<name>]"),
	description = S("List your areas. Admins can list all areas or those of a specific player."),
	func = function(name, param)
		local admin = minetest.check_player_privs(name, areas.adminPrivs)
		local admin_show_summary = admin
		local owner_name = name

		if admin and #param > 0 then
			owner_name = param
			admin_show_summary = false
		end

		local areaStrings = {}
		if admin_show_summary then
			-- Summary per-player
			local indices = {}
			local counts = {} -- { [1] = name, [2] = count }, ...
			for _, area in pairs(areas.areas) do
				local i = indices[area.owner]
				if i then
					counts[i][2] = counts[i][2] + 1
				else
					table.insert(counts, { area.owner, 1 })
					indices[area.owner] = #counts
				end
			end
			-- Alphabatical name sorting
			table.sort(counts, function (kv_a, kv_b)
				return kv_a[1] < kv_b[1]
			end)
			--  Output
			for _, kv in ipairs(counts) do
				table.insert(areaStrings, S("@1 : @2 area(s)", kv[1], kv[2]))
			end
		else
			-- Detailed list
			for id, area in pairs(areas.areas) do
				if areas:isAreaOwner(id, owner_name) then
					table.insert(areaStrings, areas:toString(id))
				end
			end
		end
		if #areaStrings == 0 then
			return true, S("No visible areas.")
		end
		return true, table.concat(areaStrings, "\n")
	end
})


minetest.register_chatcommand("recursive_remove_areas", {
	params = S("<ID>"),
	description = S("Recursively remove areas using an ID"),
	func = function(name, param)
		local id = tonumber(param)
		if not id then
			return false, S("Invalid usage, see"
					.." /help @1.", "recursive_remove_areas")
		end

		if not areas:isAreaOwner(id, name) then
			return false, S("Area @1 does not exist or is"
					.." not owned by you.", id)
		end

		areas:remove(id, true)
		areas:save()
		return true, S("Removed area @1 and its sub areas.", id)
	end
})


minetest.register_chatcommand("remove_area", {
	params = S("<ID>"),
	description = S("Remove an area using an ID"),
	func = function(name, param)
		local id = tonumber(param)
		if not id then
			return false, S("Invalid usage, see /help @1.", "remove_area")
		end

		if not areas:isAreaOwner(id, name) then
			return false, S("Area @1 does not exist or"
					.." is not owned by you.", id)
		end

		areas:remove(id)
		areas:save()
		return true, S("Removed area @1", id)
	end
})


minetest.register_chatcommand("change_owner", {
	params = S("<ID>").." "..S("<NewOwner>"),
	description = S("Change the owner of an area using its ID"),
	func = function(name, param)
		local id, newOwner = param:match("^(%d+)%s(%S+)$")
		if not id then
			return false, S("Invalid usage, see"
					.." /help @1.", "change_owner")
		end

		if not areas:player_exists(newOwner) then
			return false, S("The player \"@1\" does not exist.", newOwner)
		end

		id = tonumber(id)
		if not areas:isAreaOwner(id, name) then
			return false, S("Area @1 does not exist"
					.." or is not owned by you.", id)
		end
		areas.areas[id].owner = newOwner
		areas:save()
		minetest.chat_send_player(newOwner,
			S("@1 has given you control over the area \"@2\" (ID @3).",
				name, areas.areas[id].name, id))
		return true, S("Owner changed.")
	end
})


minetest.register_chatcommand("area_open", {
	params = S("<ID>"),
	description = S("Toggle an area open (anyone can interact) or closed"),
	func = function(name, param)
		local id = tonumber(param)
		if not id then
			return false, S("Invalid usage, see /help @1.", "area_open")
		end

		if not areas:isAreaOwner(id, name) then
			return false, S("Area @1 does not exist"
					.." or is not owned by you.", id)
		end
		local open = not areas.areas[id].open
		-- Save false as nil to avoid inflating the DB.
		areas.areas[id].open = open or nil
		areas:save()
		return true, open and S("Area opened.") or S("Area closed.")
	end
})


if areas.factions_available then
	minetest.register_chatcommand("area_faction_open", {
		params = S("<ID> [faction_name]"),
		description = S("Toggle an area open/closed for members in your faction."),
		func = function(name, param)
			local params = param:split(" ")

			local id = tonumber(params[1])
			local faction_name = params[2]

			if not id or not faction_name then
				return false, S("Invalid usage, see /help @1.", "area_faction_open")
			end

			if not areas:isAreaOwner(id, name) then
				return false, S("Area @1 does not exist"
						.." or is not owned by you.", id)
			end

			if not factions.get_owner(faction_name) then
				return false, S("Faction doesn't exists")
			end
			local fnames = areas.areas[id].faction_open or {}
			local pos = table.indexof(fnames, faction_name)
			if pos < 0 then
				-- Add new faction to the list
				table.insert(fnames, faction_name)
			else
				table.remove(fnames, pos)
			end
			if #fnames == 0 then
				-- Save {} as nil to avoid inflating the DB.
				fnames = nil
			end
			areas.areas[id].faction_open = fnames
			areas:save()
			return true, fnames and S("Area is open for members of: @1", table.concat(fnames, ", "))
				or S("Area closed for faction members.")
		end
	})
end


minetest.register_chatcommand("move_area", {
	params = S("<ID>"),
	description = S("Move (or resize) an area to the current positions."),
	privs = areas.adminPrivs,
	func = function(name, param)
		local id = tonumber(param)
		if not id then
			return false, S("Invalid usage, see /help @1.", "move_area")
		end

		local area = areas.areas[id]
		if not area then
			return false, S("Area does not exist.")
		end

		local pos1, pos2 = areas:getPos(name)
		if not pos1 then
			return false, S("You need to select an area first.")
		end

		areas:move(id, area, pos1, pos2)
		areas:save()

		return true, S("Area successfully moved.")
	end,
})


minetest.register_chatcommand("area_info", {
	description = S("Get information about area configuration and usage."),
	func = function(name, param)
		local lines = {}
		local privs = minetest.get_player_privs(name)

		-- Short (and fast to access) names
		local cfg = areas.config
		local self_prot  = cfg.self_protection
		local prot_priv  = cfg.self_protection_privilege
		local limit      = cfg.self_protection_max_areas
		local limit_high = cfg.self_protection_max_areas_high
		local size_limit = cfg.self_protection_max_size
		local size_limit_high = cfg.self_protection_max_size_high

		local has_high_limit = privs.areas_high_limit
		local has_prot_priv = not prot_priv or privs[prot_priv]
		local can_prot = privs.areas or (self_prot and has_prot_priv)
		local max_count = can_prot and
			(has_high_limit and limit_high or limit) or 0
		local max_size = has_high_limit and
			size_limit_high or size_limit

		-- Self protection information
		local self_prot_line = self_prot and S("Self protection is enabled.") or
					S("Self protection is disabled.")
		table.insert(lines, self_prot_line)
		-- Privilege information
		local priv_line = has_prot_priv and
					S("You have the necessary privilege (\"@1\").", prot_priv) or
					S("You don't have the necessary privilege (\"@1\").", prot_priv)
		table.insert(lines, priv_line)
		if privs.areas then
			table.insert(lines, S("You are an area"..
				" administrator (\"areas\" privilege)."))
		elseif has_high_limit then
			table.insert(lines,
				S("You have extended area protection"..
				" limits (\"areas_high_limit\" privilege)."))
		end

		-- Area count
		local area_num = 0
		for id, area in pairs(areas.areas) do
			if area.owner == name then
				area_num = area_num + 1
			end
		end
		table.insert(lines, S("You have @1 areas.", area_num))

		-- Area limit
		local area_limit_line = privs.areas and
			S("Limit: no area count limit") or
			S("Limit: @1 areas", max_count)
		table.insert(lines, area_limit_line)

		-- Area size limits
		local function size_info(str, size)
			table.insert(lines, S("@1 spanning up to @2x@3x@4.",
				str, size.x, size.y, size.z))
		end
		local function priv_limit_info(lpriv, lmax_count, lmax_size)
			size_info(S("Players with the \"@1\" privilege"..
				" can protect up to @2 areas", lpriv, lmax_count),
				lmax_size)
		end
		if self_prot then
			if privs.areas then
				priv_limit_info(prot_priv,
					limit, size_limit)
				priv_limit_info("areas_high_limit",
					limit_high, size_limit_high)
			elseif has_prot_priv then
				size_info(S("You can protect areas"), max_size)
			end
		end

		return true, table.concat(lines, "\n")
	end,
})


minetest.register_chatcommand("areas_cleanup", {
	description = S("Removes all ownerless areas"),
	privs = areas.adminPrivs,
	func = function()
		local total, count = 0, 0

		local aareas = areas.areas
		for id, _ in pairs(aareas) do
			local owner = aareas[id].owner

			if not areas:player_exists(owner) then
				areas:remove(id)
				count = count + 1
			end

			total = total + 1
		end
		areas:save()

		return true, "Total areas: " .. total .. ", Removed " ..
			count .. " areas. New count: " .. (total - count)
	end
})