--
-- Map handling
--

nav.map_radius = 256

nav.waypoints = {}

local open_formspecs = {}

-- Timer

local timer_interval = 0.1
local timer = 10

function nav.add_waypoint(pos, name, label, isinfo, type)
   nav.waypoints[name] = {
      pos = pos,
      label = label,
      isinfo = isinfo or false,
      type = type
   }
end

function nav.remove_waypoint(name)
   nav.waypoints[name] = nil
end

function nav.relocate_waypoint(name, pos)
   nav.waypoints[name].pos = pos
end

function nav.get_waypoints_in_square(pos, radius)
   local wpts = {}

   for name, data in pairs(nav.waypoints) do
      local wp = data.pos

      if wp.x > pos.x-radius and wp.x < pos.x+radius
      and  wp.z > pos.z-radius and wp.z < pos.z+radius then
	 table.insert(wpts, name)
      end
   end

   return wpts
end

local function get_formspec_waypoint(x, y, name, label, isinfo)
   local img = "nav_waypoint.png"
   if isinfo then
      img = "nav_info.png"
   end

   local form = ""

   form = form .. "image_button[" .. (x-0.72) .. "," .. (y-0.53) .. ";0.5,0.5;"
      .. img .. ";" .. name .. ";;false;false;" .. img .. "]"
   form = form .. "tooltip[" .. name .. ";" .. minetest.formspec_escape(label) .. "]"

   return form
end

function nav.show_map(player)
   if player == nil then return end

   local name = player:get_player_name()

   if not open_formspecs[name] then return end

   local pos = player:getpos()

   local form = default.ui.get_page("default:default")

   form = form  ..  "field[-1,-1;0,0;nav_map_tracker;;]"

   form = form .. "label[0.25,0.25;" .. minetest.formspec_escape(name)
      .. " (x: " .. math.floor(pos.x+0.5)
      .. ", y: " .. math.floor(pos.y)
      .. ", z: " .. math.floor(pos.z+0.5) .. ")]"

   form = form .. "image[0.5,3;6,6;nav_background.png]"

   local wpts = nav.get_waypoints_in_square(pos, nav.map_radius)
   for _, wptname in pairs(wpts) do
      local wpt = nav.waypoints[wptname]

      form = form .. get_formspec_waypoint(
	 3.5+(((wpt.pos.x-pos.x)/nav.map_radius)*3),
	 6+(((pos.z-wpt.pos.z)/nav.map_radius)*3),
	 wptname,
	 wpt.label,
	 wpt.isinfo)
   end

   form = form .. "image[5.5,3;1,1;nav_map_compass.png]"

   form = form .. "label[6.25,6.6;" .. nav.map_radius .. "m]"
   form = form .. "image[5.5,5.5;3,3;"
      .. minetest.formspec_escape("nav_legend.png^[transformFX") .. "]"

   minetest.show_formspec(name, "nav:map", form)
end

-- Formspec interaction

local function on_player_recieve_fields(player, form_name, fields)
   if form_name == "nav:map" then
      if fields.quit or fields.nav_map_tracker then
	 open_formspecs[player:get_player_name()] = false
      end
   end
end

if minetest.setting_get_pos("static_spawnpoint")
and (not minetest.is_singleplayer()) then
   minetest.after(
      1.0,
      function()
	 nav.add_waypoint(minetest.setting_get_pos("static_spawnpoint"),
			  "spawn", "Spawn", true, "spawn")
   end)
end

-- Joining player

local function on_joinplayer(player)
   local name = player:get_player_name()

   minetest.after(
      1.0,
      function()
	 nav.add_waypoint(
            player:getpos(),
            "player_" .. name,
            name,
            true,
            "player"
         )
   end)
end

-- Disconnecting player

local function on_leaveplayer(player)
   local name = player:get_player_name()

   nav.remove_waypoint("player_" .. name)
end

-- Global update function

local function on_globalstep(dtime)
   timer = timer + dtime

   if timer < timer_interval then
      return
   end

   timer = 0

   local players = {}

   for _, player in pairs(minetest.get_connected_players()) do
      if player ~= nil then
         local name = player:get_player_name()

         players[name] = player

         nav.show_map(player)
      end
   end

   for wptname, wpt in pairs(nav.waypoints) do
      if wpt.type == "player" then
         if players[wpt.label] ~= nil and minetest.get_player_by_name(wpt.label) ~= nil then
            nav.relocate_waypoint(wptname, players[wpt.label]:getpos())
         end
      end
   end
end

minetest.register_on_joinplayer(on_joinplayer)
minetest.register_on_leaveplayer(on_leaveplayer)

minetest.register_on_player_receive_fields(on_player_recieve_fields)

minetest.register_globalstep(on_globalstep)

-- Items

minetest.register_craftitem(
   "nav:map",
   {
      description = "Map",
      inventory_image = "nav_inventory.png",
      wield_image = "nav_inventory.png",
      stack_max = 1,
      on_use = function(itemstack, player, pointed_thing)
         open_formspecs[player:get_player_name()] = true
         nav.show_map(player)
      end,
})

-- Crafting

crafting.register_craft(
   {
      output = "nav:map",
      items = {
         "default:stick 6",
         "default:paper 3",
      }
})


-- Achievements

achievements.register_achievement(
   "navigator",
   {
      title = "Navigator",
      description = "Craft a map",
      times = 1,
      craftitem = "nav:map",
})

default.log("map", "loaded")