-- Advanced NPC by Zorman2000
-- Based on original NPC by Tenplus1 

local S = mobs.intllib

npc = {}

-- Constants
npc.FEMALE = "female"
npc.MALE = "male"

npc.age = {
  adult = "adult",
  child = "child"
}

npc.INVENTORY_ITEM_MAX_STACK = 99

npc.ANIMATION_STAND_START = 0
npc.ANIMATION_STAND_END = 79
npc.ANIMATION_SIT_START = 81
npc.ANIMATION_SIT_END = 160
npc.ANIMATION_LAY_START = 162
npc.ANIMATION_LAY_END = 166
npc.ANIMATION_WALK_START = 168
npc.ANIMATION_WALK_END = 187

npc.direction = {
  north = 0,
  east  = 1,
  south = 2,
  west  = 3,
  north_east = 4,
  north_west = 5,
  south_east = 6,
  south_west = 7
}

npc.action_state = {
  none = 0,
  executing = 1,
  interrupted = 2
}

npc.log_level = {
  INFO = true,
  WARNING = true,
  ERROR = true,
  DEBUG = false
}

npc.texture_check = {
  timer = 0,
  interval = 0
}

---------------------------------------------------------------------------------------
-- General functions
---------------------------------------------------------------------------------------
-- Logging
function npc.log(level, message)
  if npc.log_level[level] then
    minetest.log("[advanced_npc] "..level..": "..message)
  end
end

-- NPC chat
function npc.chat(npc_name, player_name, message)
  minetest.chat_send_player(player_name, npc_name..": "..message)
end

-- Gets name of player or NPC
function npc.get_entity_name(entity)
  if entity:is_player() then
    return entity:get_player_name()
  else
    return entity:get_luaentity().name
  end
end

-- Returns the item "wielded" by player or NPC
-- TODO: Implement NPC
function npc.get_entity_wielded_item(entity)
  if entity:is_player() then
    return entity:get_wielded_item()
  end
end

---------------------------------------------------------------------------------------
-- Spawning functions
---------------------------------------------------------------------------------------
-- These functions are used at spawn time to determine several
-- random attributes for the NPC in case they are not already
-- defined. On a later phase, pre-defining many of the NPC values
-- will be allowed.

local function get_random_name(sex)
  local i = math.random(#npc.data.FIRST_NAMES[sex])
  return npc.data.FIRST_NAMES[sex][i]
end

local function initialize_inventory()
  return {
    [1] = "",  [2] = "",  [3] = "",  [4] = "",
    [5] = "",  [6] = "",  [7] = "",  [8] = "",
    [9] = "",  [10] = "", [11] = "", [12] = "",
    [13] = "", [14] = "", [15] = "", [16] = "",
  }
end

-- This function checks for "female" text on the texture name
local function is_female_texture(textures)
  for i = 1, #textures do
    if string.find(textures[i], "female") ~= nil then
      return true
    end
  end
  return false
end

local function get_random_texture(sex, age)
  local textures = {}
  local filtered_textures = {}
    -- Find textures by sex and age
  if age == npc.age.adult then
    --minetest.log("Registered: "..dump(minetest.registered_entities["advanced_npc:npc"]))
    textures = minetest.registered_entities["advanced_npc:npc"].texture_list
  elseif age == npc.age.child then
    textures = minetest.registered_entities["advanced_npc:npc"].child_texture
  end

  for i = 1, #textures do
    local current_texture = textures[i][1]
    if (sex == npc.MALE 
        and string.find(current_texture, sex) 
        and not string.find(current_texture, npc.FEMALE))
    or (sex == npc.FEMALE 
        and string.find(current_texture, sex)) then
      table.insert(filtered_textures, current_texture)
    end
  end

  -- Check if filtered textures is empty
  if filtered_textures == {} then
    return textures[1][1]
  end

  return filtered_textures[math.random(1,#filtered_textures)]
end

-- Choose whether NPC can have relationships. Only 30% of NPCs cannot have relationships
local function can_have_relationships(age)
  -- Children can't have relationships
  if not age then
    return false
  end
  local chance = math.random(1,10)
  return chance > 3
end

-- Choose a maximum of two items that the NPC will have at spawn time
-- These items are chosen from the favorite items list.
local function choose_spawn_items(self)
  local number_of_items_to_add = math.random(1, 2)
  local number_of_items = #npc.FAVORITE_ITEMS[self.sex].phase1
  
  for i = 1, number_of_items_to_add do
    npc.add_item_to_inventory(
       self,
       npc.FAVORITE_ITEMS[self.sex].phase1[math.random(1, number_of_items)].item, 
       math.random(1,5)
      )
  end
  -- Add currency to the items spawned with. Will add 5-10 tier 3
  -- currency items
  local currency_item_count = math.random(5, 10)
  npc.add_item_to_inventory(self, npc.trade.prices.currency.tier3.string, currency_item_count)

  -- For test
  npc.add_item_to_inventory(self, "default:tree", 10)
  npc.add_item_to_inventory(self, "default:cobble", 10)
  npc.add_item_to_inventory(self, "default:diamond", 2)
  npc.add_item_to_inventory(self, "default:mese_crystal", 2)
  npc.add_item_to_inventory(self, "flowers:rose", 2)
  npc.add_item_to_inventory(self, "advanced_npc:marriage_ring", 2)
  npc.add_item_to_inventory(self, "flowers:geranium", 2)
  npc.add_item_to_inventory(self, "mobs:meat", 2)
  npc.add_item_to_inventory(self, "mobs:leather", 2)
  npc.add_item_to_inventory(self, "default:sword_stone", 2)
  npc.add_item_to_inventory(self, "default:shovel_stone", 2)
  npc.add_item_to_inventory(self, "default:axe_stone", 2)

  --minetest.log("Initial inventory: "..dump(self.inventory))
end

-- Spawn function. Initializes all variables that the
-- NPC will have and choose random, starting values
function npc.initialize(entity, pos, is_lua_entity, npc_stats)
  npc.log("INFO", "Initializing NPC at "..minetest.pos_to_string(pos))

  -- Get variables
  local ent = entity
  if not is_lua_entity then
    ent = entity:get_luaentity()
  end

  ent.initialized = true

  -- Avoid NPC to be removed by mobs_redo API
  ent.remove_ok = false
  
  -- Determine sex and age
  -- If there's no previous NPC data, sex and age will be randomly chosen.
  --   - Sex: Female or male will have each 50% of spawning
  --   - Age: 90% chance of spawning adults, 10% chance of spawning children.
  -- If there is previous data then:
  --   - Sex: The unbalanced sex will get a 75% chance of spawning
  --          - Example: If there's one male, then female will have 75% spawn chance.
  --          -          If there's male and female, then each have 50% spawn chance.
  --   - Age: For each two adults, the chance of spawning a child next will be 50%
  --          If there's a child for two adults, the chance of spawning a child goes to
  --          40% and keeps decreasing unless two adults have no child.
  if npc_stats then
    -- Default chances
    local male_s, male_e = 0, 50
    local female_s, female_e = 51, 100
    local adult_s, adult_e = 0, 90
    local child_s, child_e = 91, 100
    -- Determine sex probabilities
    if npc_stats[npc.FEMALE].total > npc_stats[npc.MALE].total then
      male_e = 75
      female_s, female_e = 76, 100
    elseif npc_stats[npc.FEMALE].total < npc_stats[npc.MALE].total then
      male_e = 25
      female_s, female_e = 26, 100
    end
    -- Determine age probabilities
    if npc_stats["adult_total"] >= 2 then
      if npc_stats["adult_total"] % 2 == 0 
        and (npc_stats["adult_total"] / 2 > npc_stats["child_total"]) then
        child_s,child_e = 26, 100
        adult_e = 25
      else
        child_s, child_e = 61, 100
        adult_e = 60
      end
    end
    -- Get sex and age based on the probabilities
    local sex_chance = math.random(1, 100)
    local age_chance = math.random(1, 100)
    local selected_sex = ""
    local selected_age = ""
    -- Select sex
    if male_s <= sex_chance and sex_chance <= male_e then
      selected_sex = npc.MALE
    elseif female_s <= sex_chance and sex_chance <= female_e then
      selected_sex = npc.FEMALE
    end
    -- Set sex for NPC
    ent.sex = selected_sex
    -- Select age
    if adult_s <= age_chance and age_chance <= adult_e then
      selected_age = npc.age.adult
    elseif child_s <= age_chance and age_chance <= child_e then
      selected_age = npc.age.child
      ent.visual_size = {
        x = 0.5,
        y = 0.5
      }
      ent.collisionbox = {-0.10,-0.50,-0.10, 0.10,0.40,0.10}
      ent.is_child = true
      ent.child = true
    end
    -- Set texture accordingly
    local selected_texture = get_random_texture(selected_sex, selected_age)
    --minetest.log("Selected texture: "..dump(selected_texture))
    -- Store selected texture due to the need to restore it later
    ent.selected_texture = selected_texture
    -- Set texture and base texture
    ent.textures = {selected_texture}
    ent.base_texture = {selected_texture}
  else
    -- Get sex based on texture. This is a 50% chance for
    -- each sex as there's same amount of textures for male and female.
    -- Do not spawn child as first NPC
    if (is_female_texture(ent.base_texture)) then
      ent.sex = npc.FEMALE
    else
      ent.sex = npc.MALE
    end
  end

  -- Nametag is initialized to blank
  ent.nametag = ""

  -- Set name
  ent.npc_name = get_random_name(ent.sex)

  -- Set ID
  ent.npc_id = tostring(math.random(1000, 9999))..":"..ent.npc_name
  
  -- Initialize all gift data
  ent.gift_data = {
    -- Choose favorite items. Choose phase1 per default
    favorite_items = npc.relationships.select_random_favorite_items(ent.sex, "phase1"),
    -- Choose disliked items. Choose phase1 per default
    disliked_items = npc.relationships.select_random_disliked_items(ent.sex),
  }
  
  -- Flag that determines if NPC can have a relationship
  ent.can_have_relationship = can_have_relationships(ent.is_child)

  -- Initialize relationships object
  ent.relationships = {}

  -- Determines if NPC is married or not
  ent.is_married_to = nil

  -- Initialize dialogues
  ent.dialogues = npc.dialogue.select_random_dialogues_for_npc(ent.sex, 
                                                               "phase1",
                                                               ent.gift_data.favorite_items,
                                                               ent.gift_data.disliked_items)
  
  -- Declare NPC inventory
  ent.inventory = initialize_inventory()

  -- Choose items to spawn with
  choose_spawn_items(ent)

  -- Flags: generic booleans or functions that help drive functionality
  ent.flags = {}

  -- Declare trade data
  ent.trader_data = {
    -- Type of trader
    trader_status = npc.trade.get_random_trade_status(),
    -- Current buy offers
    buy_offers = {},
    -- Current sell offers
    sell_offers = {},
    -- Items to buy change timer
    change_offers_timer = 0,
    -- Items to buy change timer interval
    change_offers_timer_interval = 60,
    -- Trading list: a list of item names the trader is expected to trade in.
    -- It is mostly related to its occupation.
    -- If empty, the NPC will revert to casual trading
    -- If not, it will try to sell those that it have, and buy the ones it not.
    trade_list = {
      sell = {},
      buy = {},
      both = {}
    },
    -- Custom trade allows to specify more than one payment
    -- and a custom prompt (instead of the usual buy or sell prompts)
    custom_trades = {}
  }

  -- Initialize trading offers for NPC
  --npc.trade.generate_trade_offers_by_status(ent)
  -- if ent.trader_data.trader_status == npc.trade.CASUAL then
  --   select_casual_trade_offers(ent)
  -- end

  -- Actions data
  ent.actions = {
    -- The queue is a queue of actions to be performed on each interval
    queue = {},
    -- Current value of the action timer
    action_timer = 0,
    -- Determines the interval for each action in the action queue
    -- Default is 1. This can be changed via actions
    action_interval = 1,
    -- Avoid the execution of the action timer
    action_timer_lock = false,
    -- Defines the state of the current action
    current_action_state = npc.action_state.none,
    -- Store information about action on state before lock
    state_before_lock = {
      -- State of the mobs_redo API
      freeze = false,
      -- State of execution
      action_state = npc.action_state.none,
      -- Action executed while on lock
      interrupted_action = {}
    },
		-- Walking variables -- required for implementing accurate movement code
		walking = {
			-- Defines whether NPC is walking to specific position or not
			is_walking = false,
			-- Path that the NPC is following
			path = {},
			-- Target position the NPC is supposed to walk to in this step. NOTE: 
			-- This is NOT the end of the path, but the next position in the path
			-- relative to the last position
			target_pos = {}
		}
  }

  -- This flag is checked on every step. If it is true, the rest of 
  -- Mobs Redo API is not executed
  ent.freeze = nil

  -- This map will hold all the places for the NPC
  -- Map entries should be like: "bed" = {x=1, y=1, z=1}
  ent.places_map = {}

  -- Schedule data
  ent.schedules = {
    -- Flag to enable or disable the schedules functionality
    enabled = true, 
    -- Lock for when executing a schedule
    lock = false,
    -- An array of schedules, meant to be one per day at some point
    -- when calendars are implemented. Allows for only 7 schedules,
    -- one for each day of the week
    generic = {},
    -- An array of schedules, meant to be for specific dates in the 
    -- year. Can contain as many as possible. The keys will be strings
    -- in the format MM:DD
    date_based = {}
  }

  -- Dedicated trade test
  ent.trader_data.trade_list.both = {
    ["default:tree"] = {},
    ["default:cobble"] = {},
    ["default:wood"] = {},
    ["default:diamond"] = {},
    ["default:mese_crystal"] = {},
    ["flowers:rose"] = {},
    ["advanced_npc:marriage_ring"] = {},
    ["flowers:geranium"] = {},
    ["mobs:meat"] = {},
    ["mobs:leather"] = {},
    ["default:sword_stone"] = {},
    ["default:shovel_stone"] = {},
    ["default:axe_stone"] = {}
  }

  npc.trade.generate_trade_offers_by_status(ent)

  -- Add a custom trade offer
  local offer1 = npc.trade.create_custom_sell_trade_offer("Do you want me to fix your steel sword?", "Fix steel sword", "Fix steel sword", "default:sword_steel", {"default:sword_steel", "default:iron_lump 5"})
  table.insert(ent.trader_data.custom_trades, offer1)
  local offer2 = npc.trade.create_custom_sell_trade_offer("Do you want me to fix your mese sword?", "Fix mese sword", "Fix mese sword", "default:sword_mese", {"default:sword_mese", "default:copper_lump 10"})
  table.insert(ent.trader_data.custom_trades, offer2)

  --minetest.log(dump(ent))
  npc.log("INFO", "Successfully initialized NPC with name "..dump(ent.npc_name)
    ..", sex: "..ent.sex..", is child: "..dump(ent.is_child)
    ..", texture: "..dump(ent.textures))
  -- Refreshes entity
  ent.object:set_properties(ent)
end

---------------------------------------------------------------------------------------
-- Trading functions
---------------------------------------------------------------------------------------
function npc.generate_trade_list_from_inventory(self)
  local list = {}
  for i = 1, #self.inventory do
    list[npc.get_item_name(self.inventory[i])] = {}
  end
  self.trader_data.trade_list.both = list
end

function npc.set_trading_status(self, status)
  -- Set status
  self.trader_data.trader_status = status
  -- Re-generate trade offers
  npc.trade.generate_trade_offers_by_status(self)
end

---------------------------------------------------------------------------------------
-- Inventory functions
---------------------------------------------------------------------------------------
-- NPCs inventories are restrained to 16 slots.
-- Each slot can hold one item up to 99 count.

-- Utility function to get item name from a string
function npc.get_item_name(item_string)
  return ItemStack(item_string):get_name()
end

-- Utility function to get item count from a string
function npc.get_item_count(item_string)
  return ItemStack(item_string):get_count()
end

-- Add an item to inventory. Returns true if add successful
-- These function can be used to give items to other NPCs
-- given that the "self" variable can be any NPC
function npc.add_item_to_inventory(self, item_name, count)
  -- Check if NPC already has item
  local existing_item = npc.inventory_contains(self, item_name)
  if existing_item ~= nil and existing_item.item_string ~= nil then
    -- NPC already has item. Get count and see
    local existing_count = npc.get_item_count(existing_item.item_string)
    if (existing_count + count) < npc.INVENTORY_ITEM_MAX_STACK then
      -- Set item here
      self.inventory[existing_item.slot] = 
        npc.get_item_name(existing_item.item_string).." "..tostring(existing_count + count)
        return true
    else
      --Find next free slot
      for i = 1, #self.inventory do
        if self.inventory[i] == "" then
          -- Found slot, set item
          self.inventory[i] = 
            item_name.." "..tostring((existing_count + count) - npc.INVENTORY_ITEM_MAX_STACK)
          return true
        end
      end
      -- No free slot found
      return false
    end
  else
    -- Find a free slot
    for i = 1, #self.inventory do
      if self.inventory[i] == "" then
        -- Found slot, set item
        self.inventory[i] = item_name.." "..tostring(count)
        return true
      end
    end
    -- No empty slot found
    return false
  end
end

-- Same add method but with itemstring for convenience
function npc.add_item_to_inventory_itemstring(self, item_string)
  local item_name = npc.get_item_name(item_string)
  local item_count = npc.get_item_count(item_string)
  npc.add_item_to_inventory(self, item_name, item_count)
end

-- Checks if an item is contained in the inventory. Returns
-- the item string or nil if not found
function npc.inventory_contains(self, item_name)
  for key,value in pairs(self.inventory) do
    if value ~= "" and string.find(value, item_name) then
      return {slot=key, item_string=value}
    end
  end
  -- Item not found
  return nil
end

-- Removes the item from an NPC inventory and returns the item
-- with its count (as a string, e.g. "default:apple 2"). Returns
-- nil if unable to get the item.
function npc.take_item_from_inventory(self, item_name, count)
  local existing_item = npc.inventory_contains(self, item_name)
  if existing_item ~= nil then
    -- Found item
    local existing_count = npc.get_item_count(existing_item.item_string)
    local new_count = existing_count
    if existing_count - count  < 0 then
      -- Remove item first
      self.inventory[existing_item.slot] = ""
      -- TODO: Support for retrieving from next stack. Too complicated
      -- and honestly might be unecessary.
      return item_name.." "..tostring(new_count)
    else
      new_count = existing_count - count
      if new_count == 0 then
        self.inventory[existing_item.slot] = ""
      else
        self.inventory[existing_item.slot] = item_name.." "..new_count
      end
      return item_name.." "..tostring(count)
    end
  else
    -- Not able to take item because not found
    return nil
  end
end

-- Same take method but with itemstring for convenience
function npc.take_item_from_inventory_itemstring(self, item_string)
  local item_name = npc.get_item_name(item_string)
  local item_count = npc.get_item_count(item_string)
  npc.take_item_from_inventory(self, item_name, item_count)
end

---------------------------------------------------------------------------------------
-- Flag functionality
---------------------------------------------------------------------------------------
-- TODO: Consider removing them as they are pretty simple and straight forward.
-- Generic variables or function that help drive some functionality for the NPC.
function npc.add_flag(self, flag_name, value)
  self.flags[flag_name] = value
end

function npc.update_flag(self, flag_name, value)
  self.flags[flag_name] = value
end

function npc.get_flag(self, flag_name)
  return self.flags[flag_name]
end

---------------------------------------------------------------------------------------
-- Dialogue functionality
---------------------------------------------------------------------------------------
function npc.start_dialogue(self, clicker, show_married_dialogue)

  -- Call dialogue function as normal
  npc.dialogue.start_dialogue(self, clicker, show_married_dialogue)

  -- Check and update relationship if needed
  npc.relationships.dialogue_relationship_update(self, clicker)

end

---------------------------------------------------------------------------------------
-- Action functionality
---------------------------------------------------------------------------------------
-- This function adds a function to the action queue.
-- Actions should be added in strict order for tasks to work as expected.
function npc.add_action(self, action, arguments)
  local action_entry = {action=action, args=arguments, is_task=false}
  table.insert(self.actions.queue, action_entry)
end

-- This function adds task actions in-place, as opposed to
-- at the end of the queue. This allows for continued order
function npc.add_task(self, task, args)
  local action_entry = {action=task, args=args, is_task=true}
  table.insert(self.actions.queue, action_entry)
end

-- This function removes the first action in the action queue
-- and then executes it
function npc.execute_action(self)
  -- Check if an action was interrupted
  if self.actions.current_action_state == npc.action_state.interrupted then
    npc.log("DEBUG", "Re-inserting interrupted action for NPC: '"..dump(self.npc_name).."': "..dump(self.actions.state_before_lock.interrupted_action))
    -- Insert into queue the interrupted action
    table.insert(self.actions.queue, 1, self.actions.state_before_lock.interrupted_action)
    -- Clear the action
    self.actions.state_before_lock.interrupted_action = {}
    -- Clear the position
    self.actions.state_before_lock.pos = {}
  end
  local result = nil
  if table.getn(self.actions.queue) == 0 then
    -- Set state to none
    self.actions.current_action_state = npc.action_state.none
    -- Keep state the same if there are no more actions in actions queue
    return self.freeze
  end
  local action_obj = self.actions.queue[1]
  if action_obj.action == nil then
    return
  end
  -- If the entry is a task, then push all this new operations in
  -- stack fashion
  if action_obj.is_task == true then
    npc.log("DEBUG", "Executing task for NPC '"..dump(self.npc_name).."': "..dump(action_obj))
    -- Backup current queue
    local backup_queue = self.actions.queue
    -- Remove this "task" action from queue
    table.remove(self.actions.queue, 1)
    -- Clear queue
    self.actions.queue = {}
    -- Now, execute the task with its arguments
    result = npc.actions.execute(self, action_obj.action, action_obj.args)
    --result = action_obj.action(self, action_obj.args)
    -- After all new actions has been added by task, add the previously
    -- queued actions back
    for i = 1, #backup_queue do
      table.insert(self.actions.queue, backup_queue[i])
    end
  else
    npc.log("DEBUG", "Executing action for NPC '"..dump(self.npc_name).."': "..dump(action_obj))
    -- Store the action that is being executed
    self.actions.state_before_lock.interrupted_action = action_obj
    -- Store current position
    self.actions.state_before_lock.pos = self.object:getpos()
    -- Execute action as normal
    result = npc.actions.execute(self, action_obj.action, action_obj.args)
    --result = action_obj.action(self, action_obj.args)
    -- Remove task
    table.remove(self.actions.queue, 1)
    -- Set state
    self.actions.current_action_state = npc.action_state.executing
  end
  return result
end

function npc.lock_actions(self)

  -- Avoid re-locking if already locked
  if self.actions.action_timer_lock == true then
    return
  end

  local pos = self.object:getpos()

  if self.freeze == false then
    -- Round current pos to avoid the NPC being stopped on positions
    -- where later on can't walk to the correct positions
    -- Choose which position is to be taken as start position
    if self.actions.state_before_lock.pos ~= {} then
      pos = vector.round(self.actions.state_before_lock.pos)
    else
      pos = vector.round(self.object:getpos())
    end
    pos.y = self.object:getpos().y
  end
  -- Stop NPC
  npc.actions.execute(self, npc.actions.cmd.STAND, {pos=pos})
  -- Avoid all timer execution
  self.actions.action_timer_lock = true
  -- Reset timer so that it has some time after interaction is done
  self.actions.action_timer = 0
  -- Check if there are is an action executing
  if self.actions.current_action_state == npc.action_state.executing 
    and self.freeze == false then
    -- Store the current action state
    self.actions.state_before_lock.action_state = self.actions.current_action_state
    -- Set current action state to interrupted
    self.actions.current_action_state = npc.action_state.interrupted
  end
  -- Store the current freeze variable
  self.actions.state_before_lock.freeze = self.freeze
  -- Freeze mobs_redo API
  self.freeze = false

  npc.log("DEBUG", "Locking NPC "..dump(self.npc_id).." actions")
end

function npc.unlock_actions(self)
  -- Allow timers to execute
  self.actions.action_timer_lock = false
  -- Restore the value of self.freeze
  self.freeze = self.actions.state_before_lock.freeze
  
  if table.getn(self.actions.queue) == 0 then
    -- Allow mobs_redo API to execute since action queue is empty
    self.freeze = true
  end

  npc.log("DEBUG", "Unlocked NPC "..dump(self.npc_id).." actions")
end

---------------------------------------------------------------------------------------
-- Schedule functionality
---------------------------------------------------------------------------------------
-- Schedules allow the NPC to do different things depending on the time of the day.
-- The time of the day is in 24 hours and is consistent with the Minetest Game 
-- /time command. Hours will be written as numbers: 1 for 1:00, 13 for 13:00 or 1:00 PM
-- The API is as following: a schedule can be created for a specific date or for a
-- day of the week. A date is a string in the format MM:DD
npc.schedule_types = {
  ["generic"] = "generic",
  ["date_based"] = "date_based"
}

npc.schedule_properties = {
  put_item = "put_item",
  take_item = "take_item",
  trader_status = "trader_status"
}

local function get_time_in_hours() 
  return minetest.get_timeofday() * 24
end

-- Create a schedule on a NPC.
-- Schedule types:
--  - Generic: Returns nil if there are already
--    seven schedules, one for each day of the
--    week or if the schedule attempting to add
--    already exists. The date parameter is the 
--    day of the week it represents as follows:
--      - 1: Monday
--      - 2: Tuesday
--      - 3: Wednesday
--      - 4: Thursday
--      - 5: Friday
--      - 6: Saturday
--      - 7: Sunday
--  - Date-based: The date parameter should be a
--    string of the format "MM:DD". If it already
--    exists, function retuns nil
function npc.create_schedule(self, schedule_type, date)
  if schedule_type == npc.schedule_types.generic then
    -- Check that there are no more than 7 schedules
    if #self.schedules.generic == 7 then
      -- Unable to add schedule
      return nil
    elseif #self.schedules.generic < 7 then
      -- Check schedule doesn't exists already
      if self.schedules.generic[date] == nil then
        -- Add schedule
        self.schedules.generic[date] = {}
      else
        -- Schedule already present
        return nil
      end
    end
  elseif schedule_type == npc.schedule_types.date then
    -- Check schedule doesn't exists already
    if self.schedules.date_based[date] == nil then
      -- Add schedule 
      self.schedules.date_based[date] = {}
    else
      -- Schedule already present
      return nil
    end
  end
end

function npc.delete_schedule(self, schedule_type, date)
  -- Delete schedule by setting entry to nil
  self.schedules[schedule_type][date] = nil
end

-- Schedule entries API
-- Allows to add, get, update and delete entries from each
-- schedule. Attempts to be as safe-fail as possible to avoid crashes. 

-- Actions is an array of actions and tasks that the NPC
-- will perform at the scheduled time on the scheduled date
function npc.add_schedule_entry(self, schedule_type, date, time, check, actions)
  -- Check that schedule for date exists
  if self.schedules[schedule_type][date] ~= nil then
    -- Add schedule entry
    if check == nil then
      self.schedules[schedule_type][date][time] = actions
    else
      self.schedules[schedule_type][date][time].check = check
    end
  else
    -- No schedule found, need to be created for date
    return nil
  end
end

function npc.get_schedule_entry(self, schedule_type, date, time)
  -- Check if schedule for date exists
  if self.schedules[schedule_type][date] ~= nil then
    -- Return schedule
    return self.schedules[schedule_type][date][time]
  else
    -- Schedule for date not found
    return nil
  end
end

function npc.update_schedule_entry(self, schedule_type, date, time, check, actions)
  -- Check schedule for date exists
  if self.schedules[schedule_type][date] ~= nil then
    -- Check that a schedule entry for that time exists
    if self.schedules[schedule_type][date][time] ~= nil then
      -- Set the new actions
      if check == nil then
        self.schedules[schedule_type][date][time] = actions
      else
        self.schedules[schedule_type][date][time].check = check
      end
    else
      -- Schedule not found for specified time
      return nil
    end
  else
    -- Schedule not found for date
    return nil
  end
end

function npc.delete_schedule_entry(self, schedule_type, date, time)
  -- Check schedule for date exists
  if self.schedules[schedule_type][date] ~= nil then
    -- Remove schedule entry by setting to nil
    self.schedules[schedule_type][date][time] = nil
  else
    -- Schedule not found for date
    return nil
  end
end

function npc.schedule_change_property(self, property, args)
  if property == npc.schedule_properties.trader_status then
    -- Get status from args
    local status = args.status
    -- Set status to NPC
    npc.set_trading_status(self, status)
  elseif property == npc.schedule_properties.put_item then

  elseif property == npc.schedule_properties.take_item then

  end
end

---------------------------------------------------------------------------------------
-- NPC Definition
---------------------------------------------------------------------------------------
mobs:register_mob("advanced_npc:npc", {
	type = "npc",
	passive = false,
	damage = 3,
	attack_type = "dogfight",
	attacks_monsters = true,
	-- Added group attack
	group_attack = true,
	--pathfinding = true,
	pathfinding = 1,
	hp_min = 10,
	hp_max = 20,
	armor = 100,
  collisionbox = {-0.20,-1.0,-0.20, 0.20,0.8,0.20},
  --collisionbox = {-0.35,-1.0,-0.35, 0.35,0.8,0.35},
	visual = "mesh",
	mesh = "character.b3d",
	drawtype = "front",
	textures = {
		{"npc_male1.png"},
    {"npc_male2.png"},
    {"npc_male3.png"},
    {"npc_male4.png"},
    {"npc_male5.png"},
    {"npc_male6.png"},
		{"npc_female1.png"}, -- female by nuttmeg20
	},
	child_texture = {
		{"npc_baby_male1.png"},
	  {"npc_baby_female1.png"},
  },
	makes_footstep_sound = true,
	sounds = {},
	-- Added walk chance
	walk_chance = 30,
	-- Added stepheight
	stepheight = 0.6,
	walk_velocity = 1,
	run_velocity = 3,
	jump = false,
	drops = {
		{name = "default:wood", chance = 1, min = 1, max = 3},
		{name = "default:apple", chance = 2, min = 1, max = 2},
		{name = "default:axe_stone", chance = 5, min = 1, max = 1},
	},
	water_damage = 0,
	lava_damage = 2,
	light_damage = 0,
	--follow = {"farming:bread", "mobs:meat", "default:diamond"},
	view_range = 15,
	owner = "",
	order = "follow",
	--order = "stand",
	fear_height = 3,
	animation = {
		speed_normal = 30,
		speed_run = 30,
		stand_start = 0,
		stand_end = 79,
		walk_start = 168,
		walk_end = 187,
		run_start = 168,
		run_end = 187,
		punch_start = 200,
		punch_end = 219,
	},
	on_rightclick = function(self, clicker)

    -- Rotate NPC toward its clicker
    npc.dialogue.rotate_npc_to_player(self)

    -- Get information from clicker
		local item = clicker:get_wielded_item()
		local name = clicker:get_player_name()

    --self.child = true
    --self.textures = {"mobs_npc_child_male1.png"}
    --self.base_texture = "mobs_npc_child_male1.png"
    --self.object:set_properties(self)
    --npc.log("INFO", "NPC places: "..dump(self.places_map))
    npc.log("DEBUG", "Right-clicked NPC: "..dump(self))

    -- Receive gift or start chat. If player has no item in hand
    -- then it is going to start chat directly
    if self.can_have_relationship and item:to_table() ~= nil then
      -- Get item name
      local item = minetest.registered_items[item:get_name()]
      local item_name = item.description

      -- Show dialogue to confirm that player is giving item as gift
      npc.dialogue.show_yes_no_dialogue(
        self,
        "Do you want to give "..item_name.." to "..self.npc_name.."?",
        npc.dialogue.POSITIVE_GIFT_ANSWER_PREFIX..item_name,
        function()
          npc.relationships.receive_gift(self, clicker)
        end,
        npc.dialogue.NEGATIVE_ANSWER_LABEL,
        function()
          npc.start_dialogue(self, clicker, true)
        end,
        name
      )
    else
      npc.start_dialogue(self, clicker, true)
    end

	end,
	do_custom = function(self, dtime)
    if self.initialized == nil then
      -- Initialize NPC if spawned using the spawn egg built in from
      -- mobs_redo. This functionality will be removed in the future in
      -- favor of a better manual spawning method with customization 
      npc.log("WARNING", "Initializing NPC from entity step. This message should only be appearing if an NPC is being spawned from inventory with egg!")
      npc.initialize(self, self.object:getpos(), true)
      self.tamed = false
      self.owner = nil
    else
      -- NPC is initialized, check other variables
      -- Check child texture issues
      if self.is_child then
        -- Check texture 
        npc.texture_check.timer = npc.texture_check.timer + dtime
        if npc.texture_check.timer > npc.texture_check.interval then
          -- Reset timer
          npc.texture_check.timer = 0
          -- Set hornytimer to zero every 60 seconds so that children
          -- don't grow automatically
          self.hornytimer = 0
          -- Set correct textures
          self.texture = {self.selected_texture}
          self.base_texture = {self.selected_texture}
          self.object:set_properties(self)
          -- Set interval to large interval so this code isn't called frequently
          npc.texture_check.interval = 60
        end
      end

      -- Timer function for casual traders to reset their trade offers  
      self.trader_data.change_offers_timer = self.trader_data.change_offers_timer + dtime
      -- Check if time has come to change offers
      if self.trader_data.trader_status == npc.trade.CASUAL and 
        self.trader_data.change_offers_timer >= self.trader_data.change_offers_timer_interval then
        -- Reset timer
        self.trader_data.change_offers_timer = 0
        -- Re-select casual trade offers
        npc.trade.generate_trade_offers_by_status(self)
      end
  
  		-- Timer function for gifts
      for i = 1, #self.relationships do
        local relationship = self.relationships[i]
        -- Gift timer check
        if relationship.gift_timer_value < relationship.gift_interval then
          relationship.gift_timer_value = relationship.gift_timer_value + dtime
        elseif relationship.talk_timer_value < relationship.gift_interval then
          -- Relationship talk timer - only allows players to increase relationship
          -- by talking on the same intervals as gifts
          relationship.talk_timer_value = relationship.talk_timer_value + dtime
        else
          -- Relationship decrease timer
          if relationship.relationship_decrease_timer_value 
              < relationship.relationship_decrease_interval then
            relationship.relationship_decrease_timer_value = 
              relationship.relationship_decrease_timer_value + dtime
          else
            -- Check if married to decrease half
            if relationship.phase == "phase6" then
              -- Avoid going below the marriage phase limit
              if (relationship.points - 0.5) >= 
                npc.relationships.RELATIONSHIP_PHASE["phase5"].limit then
                relationship.points = relationship.points - 0.5
              end
            else
              relationship.points = relationship.points - 1
            end
            relationship.relationship_decrease_timer_value = 0
            --minetest.log(dump(self))
          end
        end
      end

      -- Action queue timer
      -- Check if actions and timers aren't locked
      if self.actions.action_timer_lock == false then
        -- Increment action timer
        self.actions.action_timer = self.actions.action_timer + dtime
        if self.actions.action_timer >= self.actions.action_interval then
          -- Reset action timer
          self.actions.action_timer = 0
          -- Check if NPC is walking
          if self.actions.walking.is_walking == true then
            local pos = self.actions.walking.target_pos
            self.object:moveto({x=pos.x, y=pos.y + 0.5, z=pos.z})
          end
          -- Execute action
          self.freeze = npc.execute_action(self)
          -- Check if there are still remaining actions in the queue
          if self.freeze == nil and table.getn(self.actions.queue) > 0 then
            self.freeze = false
          end
        end
      end

      -- Schedule timer
      -- Check if schedules are enabled
      if self.schedules.enabled == true then
        -- Get time of day
        local time = get_time_in_hours()
        -- Check if time is an hour
        if time % 1 < 0.1 and self.schedules.lock == false then
          -- Activate lock to avoid more than one entry to this code
          self.schedules.lock = true
          -- Get integer part of time
          time = (time) - (time % 1)
          -- Check if there is a schedule entry for this time
          -- Note: Currently only one schedule is supported, for day 0
          --minetest.log("Time: "..dump(time))
          local schedule = self.schedules.generic[0]
          if schedule ~= nil then
            -- Check if schedule for this time exists
            --minetest.log("Found default schedule")
            if schedule[time] ~= nil then
              -- Check if schedule has a check function
              if schedule[time].check ~= nil then
                -- Execute check function and then add corresponding action
                -- to action queue. This is for jobs.
                -- TODO: Need to implement
              else
                npc.log("DEBUG", "Adding actions to action queue")
                -- Add to action queue all actions on schedule
                for i = 1, #schedule[time] do
                  --minetest.log("schedule[time]: "..dump(schedule[time]))
                  if schedule[time][i].task ~= nil then
                    -- Add task
                    npc.add_task(self, schedule[time][i].task, schedule[time][i].args)
                  elseif schedule[time][i].action ~= nil then
                    -- Add action
                    npc.add_action(self, schedule[time][i].action, schedule[time][i].args)
                  elseif schedule[time][i].property ~= nil then
                    -- Change NPC property
                    npc.schedule_change_property(self, schedule[time][i].property, schedule[time][i].args)
                  end
                end
                npc.log("DEBUG", "New action queue: "..dump(self.actions))
              end
            end
          end
        else
          -- Check if lock can be released
          if time % 1 > 0.1 then
            -- Release lock
            self.schedules.lock = false
          end
        end
      end
      
      return self.freeze
    end
	end
})

-- Spawn
-- mobs:spawn({
--   name = "advanced_npc:npc",
--   nodes = {"advanced_npc:plotmarker_auto_spawner", "mg_villages:plotmarker"},
--   min_light = 3,
--   active_object_count = 1,
--   interval = 5,
--   chance = 1,
--   --max_height = 0,
--   on_spawn = npc.initialize
-- })

-------------------------------------------------------------------------
-- Item definitions
-------------------------------------------------------------------------

mobs:register_egg("advanced_npc:npc", S("NPC"), "default_brick.png", 1)

-- compatibility
mobs:alias_mob("mobs:npc", "advanced_npc:npc")

-- Marriage ring
minetest.register_craftitem("advanced_npc:marriage_ring", {
	description = S("Marriage Ring"),
	inventory_image = "marriage_ring.png",
})

-- Marriage ring craft recipe
minetest.register_craft({
	output = "advanced_npc:marriage_ring",
	recipe = { {"", "", ""},
             {"", "default:diamond", ""},
             {"", "default:gold_ingot", ""} },
})