local function after_shoot() end
local function kill() end



function quake.register_weapon(name, def)

  minetest.register_node(name, {

    description = def.description,
    drawtype = "mesh",
    mesh = def.mesh,
    tiles = def.tiles,
    wield_scale = def.wield_scale,
    inventory_image = def.inventory_image,
    stack_max = 1,
    groups = {oddly_breakable_by_hand = "2"},
    on_drop = function() end,
    on_place = function() end,

    on_use = function(itemstack, user, pointed_thing)

      ----- gestione delay dell'arma -----
      if user:get_meta():get_int("quake_weap_delay") == 1 then
        return end

      user:get_meta():set_int("quake_weap_delay", 1)

      local inv = user:get_inventory()

      minetest.after(def.weap_delay, function()
        if inv:contains_item("main", "quake:match_over") then return end
        user:get_meta():set_int("quake_weap_delay", 0)
        end)
      -----fine gestione delay -----


      --se sono immune e sparo, perdo l'immunità
      if inv:contains_item("main", "arena_lib:immunity") then
        inv:remove_item("main", "arena_lib:immunity")
      end

      -- riproduzione suono
      minetest.sound_play(def.weap_sound_shooting, {
        to_player = user:get_player_name(),
        max_hear_distance = 5,
        })

      local dir = user:get_look_dir()
      local pos = user:get_pos()
      local pos_head = {x = pos.x, y = pos.y+1.475, z = pos.z}            -- deve sparare all'altezza mirino, ovvero dalla testa
      local username = user:get_player_name()

      -- controllo se è hitscan o usa proiettili, e sparo
      if def.is_hitscan then
        local pointed_players = get_pointed_players(pos_head, dir, def.range, username)
        if not pointed_players then return end

        quake.shoot(user:get_player_name(), pointed_players, def.weap_damage, def.has_knockback)

      else
        local bullet = def.bullet
        quake.shoot_bullet(user, bullet, pos_head, dir)
      end

    end,
    })

end



-- ritorna un array di player con il numero di player trovati a index 1. Se non
-- trova player diversi da se stessi ritorna nil
function get_pointed_players(head_pos, dir, dist, username)
	local p1 = vector.add(head_pos, vector.divide(dir,4))
	local p2 = vector.add(head_pos, vector.multiply(dir, dist))
	local ray = minetest.raycast(p1, p2, true, true)

	minetest.add_particlespawner({
  	amount = 20,
  	time = 0.3,
  	minpos = p1,
  	maxpos = p1,
  	minvel = vector.multiply(dir,120),
  	maxvel = vector.multiply(dir,120),
  	minexptime = 0.2,
  	maxexptime = 0.2,
  	size = 2,
  	collisiondetection = false,
  	vertical = false,
    texture = "quake_railgun_trail.png"
	})

	local players = {}

  -- check su ogni cosa attraversata dal raycast (p1 a p2)
	for hit in ray do
    -- se è un oggetto
		if hit.type == "object" and hit.ref then
      -- se è un giocatore
			if hit.ref:is_player() then
        -- e non è colui che spara
				if hit.ref:get_player_name() ~= username then
					table.insert(players, hit.ref)
				end
			end
		else
      -- se è un nodo mi fermo, e ritorno l'array se > 0 (ovvero ha trovato giocatori)
			if hit.type == "node" then
				if #players > 0 then
					return players
				else
					return nil
				end
			end
		end
	end

  -- se ho sparato a qualcuno puntando in aria (quindi senza incrociare blocchi)
	if #players > 0 then
		return players
	end
end



-- può avere uno o più target: formato ObjectRef
function quake.shoot(p_name, targets, damage, has_knockback)

  local arena = arena_lib.get_arena_by_player(p_name)
  local killed_players = 0

  if not arena then return end

  if type(targets) ~= "table" then
    targets = {targets}
  end

  -- per ogni giocatore colpito
  for _, target in pairs(targets) do

    if target:get_hp() <= 0 or arena.in_celebration then return end

    -- controllo le immunità
    if target:get_inventory():contains_item("main", "arena_lib:immunity") then
      --TODO: sostituire con un suono
      minetest.chat_send_player(p_name, minetest.colorize("#d7ded7", S("You can't hit @1 due to immunity", target:get_player_name())))
    return end

    -- eventuale knockback
    if has_knockback then
      local dir = minetest.get_player_by_name(p_name):get_look_dir()
      local knockback = vector.multiply(dir,14)
      target:add_player_velocity(knockback)
    end

    local t_name = target:get_player_name()
    local remaining_HP = target:get_hp() - damage

    -- controllo se è shutdown PRIMA di ucciderlo, sennò si resetta killstreak
    if remaining_HP <= 0 and arena.players[t_name].killstreak >= 3 then
      quake.add_achievement(p_name, 4)
      quake.show_achievement(p_name, 4)
      arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", t_name .. " ") .. minetest.colorize("#d7ded7", S("has been stopped by @1", minetest.colorize("#eea160", p_name))))
    end

    -- applico il danno
    target:set_hp(remaining_HP)

    -- eventuale morte
    if target:get_hp() <= 0 then
      kill(arena, p_name, target)
      killed_players = killed_players +1
    end

  end

  -- calcoli post-danno
  after_shoot(arena, p_name, killed_players)
end



function after_shoot(arena, p_name, killed_players)

  -- eventuale achievement doppia/tripla uccisione
  if killed_players > 1 then

    if killed_players == 2 then
      quake.add_achievement(p_name, 6)
      quake.show_achievement(p_name, 6)
    elseif killed_players >= 3 then
      quake.add_achievement(p_name, 7)
      quake.show_achievement(p_name, 7)
    end

    arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", p_name .. " ") .. minetest.colorize("#d7ded7", S("has killed @1 players in a row!", killed_players)))
  end

end



function kill(arena, p_name, target)

  -- riproduco suono morte
  minetest.sound_play("quake_kill", {
    to_player = p_name,
    max_hear_distance = 1,
  })

  local t_name = target:get_player_name()

  -- informo dell'uccisione
  minetest.chat_send_player(p_name, minetest.colorize("#d7ded7", S("You've killed @1", minetest.colorize("#eea160", t_name))))
  minetest.chat_send_player(t_name, minetest.colorize("#d7ded7", S("You've been killed by @1", minetest.colorize("#eea160", p_name))))

  local p_stats = arena.players[p_name]

  -- aggiungo la kill
  p_stats.kills = p_stats.kills +1
  p_stats.killstreak = p_stats.killstreak +1
  quake.calc_kill_leader(arena, p_name)

  --eventuale first blood
  if arena.first_blood == "" then
    arena.first_blood = p_name
    quake.add_achievement(p_name, 5)
    quake.show_achievement(p_name, 5)
    arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", p_name .. " ") .. minetest.colorize("#d7ded7", S("drew first blood")))
  end

  -- visibilità kill leader
  local kill_leader = arena.kill_leader
  for pl_name, stats in pairs(arena.players) do
    quake.update_HUD(arena, pl_name, "KLR_data", arena.players[kill_leader].kills .. "  |  " .. kill_leader)
  end

  -- eventuale killstreak
  if p_stats.killstreak == 3 then
    arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", p_name .. " ") .. minetest.colorize("#d7ded7", S("is on a @1", minetest.colorize("#eea160", S("killing spree")))) .. minetest.colorize("#d7ded7", "!"))
    --quake.add_xp(p_name, 10)
    quake.add_achievement(p_name, 1)
    quake.show_achievement(p_name, 1)
  elseif p_stats.killstreak == 5 then
    arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", p_name .. " ") .. minetest.colorize("#d7ded7", S("is @1", minetest.colorize("#eea160", S("unstoppable")))) .. minetest.colorize("#d7ded7", "!"))
    --quake.add_xp(p_name, 25)
    quake.add_achievement(p_name, 2)
    quake.show_achievement(p_name, 2)
  elseif p_stats.killstreak == 7 then
    arena_lib.send_message_players_in_arena(arena, minetest.colorize("#eea160", p_name .. " ") .. minetest.colorize("#d7ded7", S("made a @1", string.upper(minetest.colorize("#eea160", S("bloodbath"))))) .. minetest.colorize("#d7ded7", "!"))
    --quake.add_xp(p_name, 50)
    quake.add_achievement(p_name, 3)
    quake.show_achievement(p_name, 3)
  end

  -- aggiorno HUD
  quake.update_HUD(arena, p_name, "KLS_data", p_stats.kills)
  quake.update_stats(arena)

  -- aggiungo XP
  --quake.add_xp(p_name, 5)

  -- se kill cap raggiunto finisce match
  if arena.players[p_name].kills == arena.kill_cap then
    local mod = arena_lib.get_mod_by_player(p_name)
    arena_lib.load_celebration(mod, arena, p_name)
  end

end