staff = {}

local f, err = io.open(minetest.get_worldpath() .. "/staff", "r")
if f == nil then
     local f, err = io.open(minetest.get_worldpath() .. "/staff", "w")
     f:write(minetest.serialize(staff))
     f:close()
end

function save_table_data()
     local data = staff
     local f, err = io.open(minetest.get_worldpath() .. "/staff", "w")
     if err then
          return err
     end
     f:write(minetest.serialize(data))
     f:close()
end

function read_table_data()
     local f, err = io.open(minetest.get_worldpath() .. "/staff", "r")
     local data = minetest.deserialize(f:read("*a"))
     f:close()
          return data
end

-- Shows a message in chat when a player kills another player.
minetest.register_on_punchplayer(function(player, hitter, tool_capabilities, damage)
     local player_hit = player:get_player_name()
     local criminal = hitter:get_player_name()
     local murder_weapon = hitter:get_wielded_item():to_string()
     minetest.after(.1, function()
          local health = player:get_hp()
          if health == 0 then
               minetest.chat_send_all(criminal .. " killed " .. player_hit .. " with " .. murder_weapon .. ".")
          end
     end)
end)

-- Shows a connecting message when someone is connecting.
minetest.register_on_prejoinplayer(function(name, ip)
     minetest.chat_send_all(name .." is connecting!")
end)

-- Server Reboot.
minetest.register_chatcommand("reboot", {
     description = "Warn players and reboot server",
     func = function(name, param)
          if minetest.check_player_privs(name, {server=true}) == true then
               minetest.chat_send_all("[Server] Rebooting in 1 minute!")
               minetest.after(60, function()
                    minetest.request_shutdown()
               end)
               minetest.after(10, function()
                    minetest.chat_send_all("[Server] Rebooting in 50 seconds!")
               end)
               minetest.after(20, function()
                    minetest.chat_send_all("[Server] Rebooting in 40 seconds!")
               end)
               minetest.after(30, function()
                    minetest.chat_send_all("[Server] Rebooting in 30 seconds!")
               end)
               minetest.after(40, function()
                    minetest.chat_send_all("[Server] Rebooting in 20 seconds!")
               end)
               minetest.after(50, function()
                    minetest.chat_send_all("[Server] Rebooting in 10 seconds!")
               end)
          end
     end
})

-- Manipulate other players.
minetest.register_chatcommand("manipulate", {
     params = "<name> <text>",
     description = "Say something as someone else if you have the server priv.",
     func = function(name, params)
          if minetest.check_player_privs(name, {server=true}) == true then
               local s = params
               local manipulated_name = s:match("%w+")
               local manipulated_text = s:match(" %w+ ..+") or s:match(" %w+")
               if manipulated_text == nil then
                    minetest.chat_send_player(name, "Invalid Parameters.")
                    return false
               else
                    if minetest.check_player_privs(name, {server=true}) == true then
                         minetest.chat_send_all("<" .. manipulated_name .. ">" .. manipulated_text)
                    end
               end
          end
     end
})

minetest.register_chatcommand("set_staff", {
     func = function(name, param)
          minetest.show_formspec(name, "chat_enhancements:staff_sheet",
               "size[8,8]" ..
               "field[1,1;5,1;host;Host:;]" ..
               "field[1,2.5;5,1;headadmin;Head Admin:;]" ..
               "field[1,4;5,1;admins;Admins:;]" ..
               "field[1,5.5;5,1;mods;Moderators:;]" ..
               "button_exit[1,7;2,1;exit;Close]")
     end
})

minetest.register_on_player_receive_fields(function(player, formname, fields)
     if formname == "chat_enhancements:staff_sheet" then
          table.insert(staff, {host=fields.host,headadmin=fields.headadmin,admins=fields.admins,moderators=fields.mods})
          save_table_data()
     end
end)

minetest.register_on_joinplayer(function(player)
     staff = read_table_data()
     local playername = player:get_player_name()
     if staff.host[playername] then
          player:set_nametag_attributes({
               color = {r = 255, g = 0, b = 0}
          })
     end
end)