Spawner = { }

-- Spawns a list of cards at the given position/rotation
-- @param cardList: A list of Player Card data structures (data/metadata)
-- @param pos Position table where the cards should be spawned (global)
-- @param rot Rotation table for the orientation of the spawned cards (global)
-- @param sort Boolean, true if this list of cards should be sorted before spawning
-- @param callback Function, callback to be called after the card/deck spawns
Spawner.spawnCards = function(cardList, pos, rot, sort, callback)
  if (sort) then
    table.sort(cardList, Spawner.cardComparator)
  end
  -- Spawn a single card directly
  if (#cardList == 1) then
    local cardPos = { pos.x, 2, pos.z}
    spawnObjectData({
      data = cardList[1].data,
      position = cardPos,
      rotation = rot,
      callback_function = callback,
    })
    return
  end

  -- Multiple cards, build a deck and spawn that
  local deck = Spawner.buildDeckDataTemplate()
  for _, spawnCard in ipairs(cardList) do
    Spawner.addCardToDeck(deck, spawnCard.data)
  end
  local deckPos = { pos.x, 3, pos.z }
  spawnObjectData({
    data = deck,
    position = deckPos,
    rotation = rot,
    callback_function = callback,
  })
end

-- Inserts a card into the given deck.  This does three things:
--   1. Add the card's data to ContainedObjects
--   2. Add the card's ID (the TTS CardID, not the Arkham ID) to the deck's
--      ID list.  Note that the deck's ID list is "DeckIDs" even though it
--      contains a list of card Ids
--   3. Extract the card's CustomDeck table and add it to the deck.  The deck's
--      "CustomDeck" field is a list of all CustomDecks used by cards within the
--      deck, keyed by the DeckID and referencing the custom deck table
---@param deck: TTS deck data structure to add to
---@param card: Data for the card to be inserted
Spawner.addCardToDeck = function(deck, cardData)
  for customDeckId, customDeckData in pairs(cardData.CustomDeck) do
    if (deck.CustomDeck[customDeckId] == nil) then
      -- CustomDeck not added to deck yet, add it
      deck.CustomDeck[customDeckId] = customDeckData
    elseif (deck.CustomDeck[customDeckId].FaceURL == customDeckData.FaceURL) then
      -- CustomDeck for this card matches the current one for the deck, do nothing
    else
      -- CustomDeck data conflict
      local newDeckId = nil
      for deckId, customDeck in pairs(deck.CustomDeck) do
        if (customDeckData.FaceURL == customDeck.FaceURL) then
          newDeckId = deckId
        end
      end
      if (newDeckId == nil) then
        -- No non-conflicting custom deck for this card, add a new one
        newDeckId = Spawner.findNextAvailableId(deck.CustomDeck, "1000")
        deck.CustomDeck[newDeckId] = customDeckData
      end
      -- Update the card with the new CustomDeck info
      cardData.CardID = newDeckId..string.sub(cardData.CardID, 5)
      cardData.CustomDeck[customDeckId] = nil
      cardData.CustomDeck[newDeckId] = customDeckData
      break
    end
  end
  table.insert(deck.ContainedObjects, cardData)
  table.insert(deck.DeckIDs, cardData.CardID)
end

-- Create an empty deck data table which can have cards added to it. This
-- creates a new table on each call without using metatables or previous
-- definitions because we can't be sure that TTS doesn't modify the structure
---@return: Table containing the minimal TTS deck data structure
Spawner.buildDeckDataTemplate = function()
  local deck = {}
  deck.Name = "Deck"

  -- Card data.  DeckIDs and CustomDeck entries will be built from the cards
  deck.ContainedObjects = {}
  deck.DeckIDs = {}
  deck.CustomDeck = {}

  -- Transform is required, Position and Rotation will be overridden by the spawn call so can be omitted here
  deck.Transform = {
    scaleX = 1,
    scaleY = 1,
    scaleZ = 1,
  }

  return deck
end

-- Returns the first ID which does not exist in the given table, starting at startId and increasing
-- @param objectTable Table keyed by strings which are numbers
-- @param startId First possible ID.
-- @return String ID >= startId
Spawner.findNextAvailableId = function(objectTable, startId)
  local id = startId
  while (objectTable[id] ~= nil) do
    id = tostring(tonumber(id) + 1)
  end

  return id
end

-- Get the PBCN (Permanent/Bonded/Customizable/Normal) value from the given metadata.
---@return: 1 for Permanent, 2 for Bonded or 4 for Normal. The actual values are
--      irrelevant as they provide only grouping and the order between them doesn't matter.
Spawner.getpbcn = function(metadata)
  if metadata.permanent then
    return 1
  elseif metadata.bonded_to ~= nil then
    return 2
  else -- Normal card
    return 3
  end
end

-- Comparison function used to sort the cards in a deck.  Groups bonded or
-- permanent cards first, then sorts within theose types by name/subname.
-- Normal cards will sort in standard alphabetical order, while
-- permanent/bonded/customizable will be in reverse alphabetical order.
--
-- Since cards spawn in the order provided by this comparator, with the first
-- cards ending up at the bottom of a pile, this ordering will spawn in reverse
-- alphabetical order.  This presents the cards in order for non-face-down
-- areas, and presents them in order when Searching the face-down deck.
Spawner.cardComparator = function(card1, card2)
  local pbcn1 = Spawner.getpbcn(card1.metadata)
  local pbcn2 = Spawner.getpbcn(card2.metadata)
  if pbcn1 ~= pbcn2 then
    return pbcn1 > pbcn2
  end
  if pbcn1 == 3 then
    if card1.data.Nickname ~= card2.data.Nickname then
      return card1.data.Nickname < card2.data.Nickname
    end
    return card1.data.Description < card2.data.Description
  else
    if card1.data.Nickname ~= card2.data.Nickname then
      return card1.data.Nickname > card2.data.Nickname
    end
    return card1.data.Description > card2.data.Description
  end
end