local blessCurseManagerApi = require("chaosbag/BlessCurseManagerApi")
local guidReferenceApi = require("core/GUIDReferenceApi")
local mythosAreaApi = require("core/MythosAreaApi")
local navigationOverlayApi = require("core/NavigationOverlayApi")
local playAreaApi = require("core/PlayAreaApi")
local playmatApi = require("playermat/PlaymatApi")
local soundCubeApi = require("core/SoundCubeApi")
local tokenArrangerApi = require("accessories/TokenArrangerApi")
local tokenChecker = require("core/token/TokenChecker")
local tokenManager = require("core/token/TokenManager")

---------------------------------------------------------
-- general setup
---------------------------------------------------------

ENCOUNTER_DECK_POS = { -3.93, 1, 5.76 }
ENCOUNTER_DECK_DISCARD_POSITION = { -3.85, 1, 10.38 }

-- GUIDs that will not be interactable (e.g. parts of the table)
local NOT_INTERACTABLE = {
  "6161b4", -- Decoration-Map
  "721ba2", -- PlayArea
  "9f334f", -- MythosArea
  "463022", -- Panel behind tentacle stand
  "f182ee", -- InvestigatorCount
  "7bff34", -- Tentacle stand
  "8646eb", -- horizontal border left
  "75937e", -- horizontal border right
  "612072", -- vertical border left
  "975c39", -- vertical border right
}

local guidHandler, DATA_HELPER

-- global variable for access
chaosTokens = {}
local chaosTokensLastMat = nil

local bagSearchers = {}
local MAT_COLORS = { "White", "Orange", "Green", "Red" }
local hideTitleSplashWaitFunctionId = nil

-- online functionality related variables
local MOD_VERSION = "3.3.0"
local SOURCE_REPO = 'https://raw.githubusercontent.com/chr1z93/loadable-objects/main'
local library, requestObj, modMeta
local acknowledgedUpgradeVersions = {}
local contentToShow = "campaigns"
local currentListItem = 1
local xmlVisibility = {
  downloadWindow = false,
  optionPanel = false,
  updateNotification = false
}
local tabIdTable = {
  tab1 = "campaigns",
  tab2 = "scenarios",
  tab3 = "fanmadeCampaigns",
  tab4 = "fanmadeScenarios",
  tab5 = "fanmadePlayerCards"
}

-- optionPanel data
optionPanel = {}
local LANGUAGES = {
  { code = "zh_CN", name = "简体中文" },
  { code = "zh_TW", name = "繁體中文" },
  { code = "de", name = "Deutsch" },
  { code = "en", name = "English" },
  { code = "es", name = "Español" },
  { code = "fr", name = "Français" },
  { code = "it", name = "Italiano" }
}
local RESOURCE_OPTIONS = {
  "enabled",
  "custom",
  "disabled"
}

---------------------------------------------------------
-- data for tokens
---------------------------------------------------------

TOKEN_DATA = {
  damage   = {image = "http://cloud-3.steamusercontent.com/ugc/1758068501357115146/903D11AAE7BD5C254C8DC136E9202EE516289DEA/", scale = {0.17, 0.17, 0.17}},
  horror   = {image = "http://cloud-3.steamusercontent.com/ugc/1758068501357163535/6D9E0756503664D65BDB384656AC6D4BD713F5FC/", scale = {0.17, 0.17, 0.17}},
  resource = {image = "http://cloud-3.steamusercontent.com/ugc/1758068501357192910/11DDDC7EF621320962FDCF3AE3211D5EDC3D1573/", scale = {0.17, 0.17, 0.17}},
  doom     = {image = "https://i.imgur.com/EoL7yaZ.png", scale = {0.17, 0.17, 0.17}},
  clue     = {image = "http://cloud-3.steamusercontent.com/ugc/1758068501357164917/1D06F1DC4D6888B6F57124BD2AFE20D0B0DA15A8/", scale = {0.15, 0.15, 0.15}}
}

ID_URL_MAP = {
  ['blue']    = {name = "Elder Sign", url = 'https://i.imgur.com/nEmqjmj.png'},
  ['p1']      = {name = "+1", url = 'https://i.imgur.com/uIx8jbY.png'},
  ['0']       = {name = "0", url = 'https://i.imgur.com/btEtVfd.png'},
  ['m1']      = {name = "-1", url = 'https://i.imgur.com/w3XbrCC.png'},
  ['m2']      = {name = "-2", url = 'https://i.imgur.com/bfTg2hb.png'},
  ['m3']      = {name = "-3", url = 'https://i.imgur.com/yfs8gHq.png'},
  ['m4']      = {name = "-4", url = 'https://i.imgur.com/qrgGQRD.png'},
  ['m5']      = {name = "-5", url = 'https://i.imgur.com/3Ym1IeG.png'},
  ['m6']      = {name = "-6", url = 'https://i.imgur.com/c9qdSzS.png'},
  ['m7']      = {name = "-7", url = 'https://i.imgur.com/4WRD42n.png'},
  ['m8']      = {name = "-8", url = 'https://i.imgur.com/9t3rPTQ.png'},
  ['skull']   = {name = "Skull", url = 'https://i.imgur.com/stbBxtx.png'},
  ['cultist'] = {name = "Cultist", url = 'https://i.imgur.com/VzhJJaH.png'},
  ['tablet']  = {name = "Tablet", url = 'https://i.imgur.com/1plY463.png'},
  ['elder']   = {name = "Elder Thing", url = 'https://i.imgur.com/ttnspKt.png'},
  ['red']     = {name = "Auto-fail", url = 'https://i.imgur.com/lns4fhz.png'},
  ['bless']   = {name = "Bless", url = 'http://cloud-3.steamusercontent.com/ugc/1655601092778627699/339FB716CB25CA6025C338F13AFDFD9AC6FA8356/'},
  ['curse']   = {name = "Curse", url = 'http://cloud-3.steamusercontent.com/ugc/1655601092778636039/2A25BD38E8C44701D80DD96BF0121DA21843672E/'},
	['frost']   = {name = "Frost", url = 'http://cloud-3.steamusercontent.com/ugc/1858293462583104677/195F93C063A8881B805CE2FD4767A9718B27B6AE/'}
}

---------------------------------------------------------
-- data for chaos token stat tracker
---------------------------------------------------------

local tokenDrawingStats = {
  ["Overall"] = {},
  ["8b081b"]  = {},
  ["bd0ff4"]  = {},
  ["383d8b"]  = {},
  ["0840d5"]  = {}
}

---------------------------------------------------------
-- general code
---------------------------------------------------------

-- saving state of optionPanel to restore later
function onSave()
  return JSON.encode({
    optionPanel = optionPanel,
    acknowledgedUpgradeVersions = acknowledgedUpgradeVersions
  })
end

function onLoad(savedData)
  if savedData then
    loadedData = JSON.decode(savedData)
    optionPanel = loadedData.optionPanel
    acknowledgedUpgradeVersions = loadedData.acknowledgedUpgradeVersions
    updateOptionPanelState()
  else
    print("Saved state could not be found!")
  end

  for _, guid in ipairs(NOT_INTERACTABLE) do
    local obj = getObjectFromGUID(guid)
    if obj ~= nil then obj.interactable = false end
  end

  DATA_HELPER = guidReferenceApi.getObjectByOwnerAndType("Mythos", "DataHelper")
  resetChaosTokenStatTracker()
  getModVersion()
  math.randomseed(os.time())

  -- initialization of loadable objects library (delay to let Navigation Overlay build)
  Wait.time(function()
    WebRequest.get(SOURCE_REPO .. '/library.json', libraryDownloadCallback)
  end, 1)
end

-- Event hook for any object search.  When chaos tokens are manipulated while the chaos bag
-- container is being searched, a TTS bug can cause tokens to duplicate or vanish.  We lock the
-- chaos bag during search operations to avoid this.
function onObjectSearchStart(object, playerColor)
  chaosbag = findChaosBag()
  if object == chaosbag then
    bagSearchers[playerColor] = true
  end
end

-- Event hook for any object search.  When chaos tokens are manipulated while the chaos bag
-- container is being searched, a TTS bug can cause tokens to duplicate or vanish.  We lock the
-- chaos bag during search operations to avoid this.
function onObjectSearchEnd(object, playerColor)
  chaosbag = findChaosBag()
  if object == chaosbag then
    bagSearchers[playerColor] = nil
  end
end

-- Pass object enter container events to the PlayArea to clear vector lines from dragged cards.
-- This requires the try method as cards won't exist any more after they enter a deck, so the lines
-- can't be cleared.
function tryObjectEnterContainer(container, object)
  playAreaApi.tryObjectEnterContainer(container, object)
  return true
end

---------------------------------------------------------
-- chaos token drawing
---------------------------------------------------------

-- checks scripting zone for chaos bag (also called by a lot of objects!)
function findChaosBag()
  local chaosbag_zone = getObjectFromGUID("83ef06")

  -- error handling: scripting zone not found
  if chaosbag_zone == nil then
    printToAll("Zone for chaos bag detection couldn't be found.", "Red")
    return
  end

  for _, item in ipairs(chaosbag_zone.getObjects()) do
    if item.getDescription() == "Chaos Bag" then
      return item
    end
  end

  -- error handling: chaos bag not found
  printToAll("Chaos bag couldn't be found.", "Red")
end

function returnChaosTokens()
  for _, token in pairs(chaosTokens) do
    if token ~= nil then chaosbag.putObject(token) end
  end
  chaosTokens = {}
end

-- Checks to see if the chaos bag can be manipulated.  If a player is searching the bag when tokens
-- are drawn or replaced a TTS bug can cause those tokens to vanish.  Any functions which change the
-- contents of the bag should check this method before doing so.
-- This method will broadcast a message to all players if the bag is being searched.
---@return Boolean.  True if the bag is manipulated, false if it should be blocked.
function canTouchChaosTokens()
  for color, searching in pairs(bagSearchers) do
    if searching then
      broadcastToAll("Someone is searching the chaos bag, can't touch the tokens.", "Red")
      return false
    end
  end
  return true
end

-- called by playermats (by the "Draw chaos token" button)
function drawChaosToken(params)
  if not canTouchChaosTokens() then return end

  local mat = params[1]
  local tokenOffset = params[2]
  local isRightClick = params[3]
  chaosbag = findChaosBag()

  -- return token(s) on other playmat first
  if chaosTokensLastMat ~= nil and chaosTokensLastMat ~= mat and #chaosTokens ~= 0 then
    returnChaosTokens()
    chaosTokensLastMat = nil
    return
  end

  chaosTokensLastMat = mat

  -- if we have left clicked and have no tokens OR if we have right clicked
  if isRightClick or #chaosTokens == 0 then
    if #chaosbag.getObjects() == 0 then return end
    chaosbag.shuffle()

    -- add the token to the list, compute new position based on list length
    tokenOffset[1] = tokenOffset[1] + (0.17 * #chaosTokens)
    local token = chaosbag.takeObject({
      index = 0,
      position = mat.positionToWorld(tokenOffset),
      rotation = mat.getRotation()
    })

    -- get data for token description
    local name = token.getName()
    local tokenData = mythosAreaApi.returnTokenData().tokenData or {}
    local specificData = tokenData[name] or {}
    token.setDescription(specificData.description or "")

    -- track the chaos token (for stat tracker and future returning)
    trackChaosToken(name, mat.getGUID())
    chaosTokens[#chaosTokens + 1] = token
    return
  else
    returnChaosTokens()
  end
end

---------------------------------------------------------
-- token spawning
---------------------------------------------------------

-- DEPRECATED.  Use TokenManager instead.
-- Spawns a single token.
---@param params Table.  Array with arguments to the method.  1 = position, 2 = type, 3 = rotation
function spawnToken(params)
  return tokenManager.spawnToken(params[1], params[2], params[3])
end

---------------------------------------------------------
-- chaos token stat tracker
---------------------------------------------------------

function trackChaosToken(tokenName, matGUID)
  tokenDrawingStats["Overall"][tokenName] = (tokenDrawingStats["Overall"][tokenName] or 0) + 1
  tokenDrawingStats[matGUID][tokenName]   = (tokenDrawingStats[matGUID][tokenName] or 0) + 1
end

-- Left-click: print stats, Right-click: reset stats
function handleStatTrackerClick(_, _, isRightClick)
  if isRightClick then
    resetChaosTokenStatTracker()
  else
    local squidKing     = "Nobody"
    local maxSquid      = 0
    local foundAnyStats = false

    for key, personalStats in pairs(tokenDrawingStats) do
      local playerColor, playerName

      if key == "Overall" then
        playerColor = "White"
        playerName = "Overall"
      else
        -- get mat color
        local matColor = playmatApi.getMatColorByPosition(getObjectFromGUID(key).getPosition())
        playerColor = playmatApi.getPlayerColor(matColor)
        playerName = Player[playerColor].steam_name or playerColor

        local playerSquidCount = personalStats["Auto-fail"]
        if playerSquidCount > maxSquid then
          squidKing = playerName
          maxSquid = playerSquidCount
        end
      end

      -- get the total count of drawn tokens for the player
      local totalCount = 0
      for tokenName, value in pairs(personalStats) do
        totalCount = totalCount + value
      end

      -- only print the personal stats if any tokens were drawn
      if totalCount > 0 then
        foundAnyStats = true
        printToAll("------------------------------")
        printToAll(playerName .. " Stats", playerColor)

        for tokenName, value in pairs(personalStats) do
          if value ~= 0 then
            printToAll(tokenName .. ': ' .. tostring(value))
          end
        end
        printToAll('Total: ' .. tostring(totalCount))
      end
    end

    -- detect if any player drew tokens
    if foundAnyStats then
      printToAll("------------------------------")
      printToAll(squidKing .. " is an auto-fail magnet.", { 255, 0, 0 })
    else
      printToAll("No tokens have been drawn yet.", "Yellow")
    end
  end
end

-- resets the count for each token to 0
function resetChaosTokenStatTracker()
  for key, _ in pairs(tokenDrawingStats) do
    tokenDrawingStats[key] = {}
    for _, token in pairs(ID_URL_MAP) do
      tokenDrawingStats[key][token.name] = 0
    end
  end
end

---------------------------------------------------------
-- Difficulty selector script
---------------------------------------------------------

-- called for button creation on the difficulty selectors
---@param object object Usually "self"
---@param key string Name of the scenario
function createSetupButtons(args)
  local data = getDataValue('modeData', args.key)
  if data ~= nil then
    local buttonParameters          = {}
    buttonParameters.function_owner = args.object
    buttonParameters.position       = { 0, 0.1, -0.15 }
    buttonParameters.scale          = { 0.47, 1, 0.47 }
    buttonParameters.height         = 200
    buttonParameters.width          = 1150
    buttonParameters.color          = { 0.87, 0.8, 0.7 }

    if data.easy ~= nil then
      buttonParameters.label = "Easy"
      buttonParameters.click_function = "easyClick"
      args.object.createButton(buttonParameters)
      buttonParameters.position[3] = buttonParameters.position[3] + 0.20
    end

    if data.normal ~= nil then
      buttonParameters.label = "Standard"
      buttonParameters.click_function = "normalClick"
      args.object.createButton(buttonParameters)
      buttonParameters.position[3] = buttonParameters.position[3] + 0.20
    end

    if data.hard ~= nil then
      buttonParameters.label = "Hard"
      buttonParameters.click_function = "hardClick"
      args.object.createButton(buttonParameters)
      buttonParameters.position[3] = buttonParameters.position[3] + 0.20
    end

    if data.expert ~= nil then
      buttonParameters.label = "Expert"
      buttonParameters.click_function = "expertClick"
      args.object.createButton(buttonParameters)
      buttonParameters.position[3] = buttonParameters.position[3] + 0.20
    end

    if data.standalone ~= nil then
      buttonParameters.label = "Standalone"
      buttonParameters.click_function = "standaloneClick"
      args.object.createButton(buttonParameters)
    end
  end
end

-- called for adding chaos tokens
---@param object object Usually "self"
---@param key string Name of the scenario
---@param mode string difficulty (e.g. "hard" or "expert")
function fillContainer(args)
  local data = getDataValue('modeData', args.key)
  if data == nil then return end

  local value = data[args.mode]
  if value == nil or value.token == nil then return end

  local tokenList = {}

  for _, tokenId in ipairs(value.token) do
    table.insert(tokenList, tokenId)
  end

  if value.append ~= nil then
    for _, tokenId in ipairs(value.append) do
      table.insert(tokenList, tokenId)
    end
  end

  -- randomly choose tokens for specific Carcosa scenarios in standalone
  if value.random then
    local n = #value.random
    if n > 0 then
      for _, tokenId in ipairs(value.random[math.random(1, n)]) do
        table.insert(tokenList, tokenId)
      end
    end
  end

  setChaosBagState(tokenList)

  if value.message then
    broadcastToAll(value.message)
  end

  if value.warning then
    broadcastToAll(value.warning, { 1, 0.5, 0.5 })
  end
end

function getDataValue(storage, key)
  local data = DATA_HELPER.getTable(storage)
  if data ~= nil then
    local value = data[key]
    if value ~= nil then
      local res = {}
      for m, v in pairs(value) do
        res[m] = v
        if res[m].parent ~= nil then
          local parentData = getDataValue(storage, res[m].parent)
          if parentData ~= nil and parentData[m] ~= nil and parentData[m].token ~= nil then
            res[m].token = parentData[m].token
          end
          res[m].parent = nil
        end
      end
      return res
    end
  end
end

function createChaosTokenNameLookupTable()
  local namesToIds = {}
  for k, v in pairs(ID_URL_MAP) do
    namesToIds[v.name] = k
  end
  return namesToIds
end

-- returns a Table List of chaos token ids in the current chaos bag
---@api chaosbag/ChaosBagApi
function getChaosBagState()
  local tokens = {}
  local invertedTable = createChaosTokenNameLookupTable()
  local chaosbag = findChaosBag()

  for _, v in ipairs(chaosbag.getObjects()) do
    local id = invertedTable[v.name]
    if id then
      table.insert(tokens, id)
    else
      printToAll(v.name .. " token not recognized. Will not be recorded.", "Yellow")
    end
  end

  return tokens
end

-- respawns the chaos bag with a new state of tokens
---@param tokenList Table List of chaos token ids
---@api chaosbag/ChaosBagApi
function setChaosBagState(tokenList)
  if not canTouchChaosTokens() then return end

  local chaosbag = findChaosBag()
  local chaosbagData = chaosbag.getData()
  local reserveData = getObjectFromGUID("106418").getData()
  local tokenCache = {}
  local containedObjects = {}

  -- create a temporary copy of the data for each chaos token
  for _, objData in ipairs(reserveData.ContainedObjects) do
    tokenCache[objData.Nickname] = objData
  end

  -- iterate over tokenlist and insert specified tokens into new table
  for _, tokenId in ipairs(tokenList) do
    local tokenName = ID_URL_MAP[tokenId].name
    table.insert(containedObjects, tokenCache[tokenName])
  end

  -- overwrite chaos bag content and respawn it
  chaosbagData.ContainedObjects = containedObjects
  chaosbag.destruct()
  spawnObjectData({ data = chaosbagData })

  -- remove tokens that are still in play
  for _, token in pairs(chaosTokens) do
    if token ~= nil then token.destruct() end
  end
  chaosTokens = {}
  chaosTokensLastMat = nil

  -- reset bless / curse manager
  blessCurseManagerApi.removeTakenTokensAndReset()

  printToAll("Chaos bag set to chosen difficulty.", "Green")
end

-- spawns the specified chaos token and puts it into the chaos bag
---@param id String ID of the chaos token
function spawnChaosToken(id)
  if not canTouchChaosTokens() then return end

  id = id:lower()
  local chaosbag = findChaosBag()
  local url = ID_URL_MAP[id].url or ""

  if url ~= "" then
    return spawnObject({
      type = 'Custom_Tile',
      position = { 0.49, 3, 0 },
      scale = { 0.81, 1.0, 0.81 },
      rotation = { 0, 270, 0 },
      callback_function = function(obj)
        obj.setName(ID_URL_MAP[id].name)
        chaosbag.putObject(obj)
        tokenArrangerApi.layout()
      end
    }).setCustomObject({
      type = 2,
      image = url,
      thickness = 0.1
    })
  end
end

-- removes the specified chaos token from the chaos bag
---@param id String ID of the chaos token
function removeChaosToken(id)
  if not canTouchChaosTokens() then return end

  local tokens = {}
  local chaosbag = findChaosBag()
  local name = ID_URL_MAP[id].name

  for _, v in ipairs(chaosbag.getObjects()) do
    if v.name == name then table.insert(tokens, v.guid) end
  end

  -- error handling: no matching token found
  if #tokens == 0 then
    printToAll("No " .. name .. " tokens in the chaos bag.", "Yellow")
    return
  end

  chaosbag.takeObject({
    guid = tokens[1],
    smooth = false,
    callback_function = function(obj)
      obj.destruct()
      tokenArrangerApi.layout()
    end
  })
  printToAll("Removing " .. name .. " token (in bag: " .. #tokens - 1 .. ")", "White")
end

-- empty the chaos bag
function emptyChaosBag()
  if not canTouchChaosTokens() then return end

  local chaosbag = findChaosBag()
  for _, object in ipairs(chaosbag.getObjects()) do
    chaosbag.takeObject({ callback_function = function(item) item.destruct() end })
  end
end

-- returns all sealed tokens on cards to the chaos bag
function releaseAllSealedTokens(playerColor)
  local chaosbag = findChaosBag()
  for _, obj in ipairs(getObjectsWithTag("CardThatSeals")) do
    obj.call("releaseAllTokens", playerColor)
  end
end

---------------------------------------------------------
-- Content Importing and XML functions
---------------------------------------------------------

-- forwards the requested content type to the update function and sets highlight to clicked tab
---@param tabId String Id of the clicked tab
function onClick_tab(_, _, tabId)
  for listId, listContent in pairs(tabIdTable) do
    if listId == tabId then
      UI.setClass(listId, 'downloadTab activeTab')
      contentToShow = listContent
    else
      UI.setClass(listId, 'downloadTab')
    end
  end
  currentListItem = 1
  updateDownloadItemList()
end

-- click function for the items in the download window
-- updates backgroundcolor for row panel and fontcolor for list item
function onClick_select(_, _, identificationKey)
  UI.setAttribute("panel" .. currentListItem, "color", "clear")
  UI.setAttribute(contentToShow .. "_" .. currentListItem, "color", "white")
  
  -- parses the identification key (contentToShow_currentListItem)
  if identificationKey then
    contentToShow = nil
    currentListItem = nil
    for str in string.gmatch(identificationKey, "([^_]+)") do
      if not contentToShow then
        -- grab the first part to know the content type
        contentToShow = str
      else
        -- get the index
        currentListItem = tonumber(str)
        break
      end
    end
  end

  UI.setAttribute("panel" .. currentListItem, "color", "grey")
  UI.setAttribute(contentToShow .. "_" .. currentListItem, "color", "black")
  updatePreviewWindow()
end

-- click function for the download button in the preview window
function onClick_download()
  placeholder_download(library[contentToShow][currentListItem])
end

-- the download button on the placeholder objects calls this to directly initiate a download
---@param param Table contains url and guid of replacement object
function placeholder_download(params)
  local url = SOURCE_REPO .. '/' .. params.url
  requestObj = WebRequest.get(url, function (request) contentDownloadCallback(request, params) end)
  startLuaCoroutine(Global, 'downloadCoroutine')
end

function downloadCoroutine()
  -- show progress bar
  UI.setAttribute('download_progress', 'active', true)

  -- update progress bar
  while requestObj do
    UI.setAttribute('download_progress', 'percentage', requestObj.download_progress * 100)
    coroutine.yield(0)
  end
  UI.setAttribute('download_progress', 'percentage', 100)

  -- wait 30 frames
  for i = 1, 30 do
    coroutine.yield(0)
  end

  -- hide progress bar
  UI.setAttribute('download_progress', 'active', false)

  -- hide download window
  if xmlVisibility.downloadWindow then
    xmlVisibility.downloadWindow = false
    UI.hide('downloadWindow')
  end
  return 1
end

-- toggles the visibility of the respective UI
---@param player LuaPlayer Player that triggered this
---@param title String Name of the UI to toggle
function onClick_toggleUi(player, title)
  if title == "Navigation Overlay" then
    navigationOverlayApi.cycleVisibility(player.color)
    return
  end

  if xmlVisibility[title] then
    -- small delay to allow button click sounds to play
    Wait.time(function() UI.hide(title) end, 0.1)
  else
    UI.show(title)
  end
  xmlVisibility[title] = not xmlVisibility[title]
end

-- updates the preview window
function updatePreviewWindow()
  local item = library[contentToShow][currentListItem]
  local tempImage = "http://cloud-3.steamusercontent.com/ugc/2115061845788345842/2CD6ABC551555CCF58F9D0DDB7620197BA398B06/"

  -- set default image if not defined
  if item.boxsize == nil or item.boxsize == "" or item.boxart == nil or item.boxart == "" then
    item.boxsize = "big"
    item.boxart = "http://cloud-3.steamusercontent.com/ugc/762723517667628371/18438B0A0045038A7099648AA3346DFCAA267C66/"
  end

  UI.setValue("previewTitle", item.name)
  UI.setValue("previewAuthor", "by " .. (item.author or "- Author not found -"))
  UI.setValue("previewDescription", item.description or "- Description not found -")

  -- update mask according to size (hardcoded values to align image in mask)
  local maskData = {}
  if item.boxsize == "big" then
    maskData = {
        image = "box-cover-mask-big",
        width = "870",
        height = "435",
        offsetXY = "154 60"
      }
  elseif item.boxsize == "small" then
    maskData = {
        image = "box-cover-mask-small",
        width = "792",
        height = "594",
        offsetXY = "135 13"
      }
  elseif item.boxsize == "wide" then
    maskData = {
        image = "box-cover-mask-wide",
        width = "756",
        height = "630",
        offsetXY = "-190 -70"
      }
  end

  -- loading empty image as placeholder until real image is loaded
  UI.setAttribute("previewArtImage", "image", tempImage)
  
  -- insert the image itself
  UI.setAttribute("previewArtImage", "image", item.boxart)
  UI.setAttributes("previewArtMask", maskData)
end

-- formats the json response from the webrequest into a key-value lua table
-- strips the prefix from the community content items
function formatLibrary(json_response)
  library = {}
  library["campaigns"] = json_response.campaigns
  library["scenarios"] = json_response.scenarios
  library["extras"] = json_response.extras
  library["fanmadeCampaigns"] = {}
  library["fanmadeScenarios"] = {}
  library["fanmadePlayerCards"] = {}

  for _, item in ipairs(json_response.community) do
    local identifier = nil
    for str in string.gmatch(item.name, "([^:]+)") do
      if not identifier then
        -- grab the first part to know the content type
        identifier = str
      else
        -- update the name without the content type
        item.name = str
        break
      end
    end

    if identifier == "Fan Investigators" then
      table.insert(library["fanmadePlayerCards"], item)
    elseif identifier == "Fan Campaign" then
      table.insert(library["fanmadeCampaigns"], item)
    elseif identifier == "Fan Scenario" then
      table.insert(library["fanmadeScenarios"], item)
    end
  end
end

-- updates the window content to the requested content
function updateDownloadItemList()
  if not library then return end

  -- addition of list items according to library file
  local globalXml = UI.getXmlTable()
  local contentList = getXmlTableElementById(globalXml, 'contentList')

  contentList.children = {}
  for i, v in ipairs(library[contentToShow]) do
    table.insert(contentList.children,
      {
        tag = "Panel",
        attributes = { id = "panel" .. i },
        children = {
          tag = 'Text',
          value = v.name,
          attributes = {
            id = contentToShow .. "_" .. i,
            onClick = 'onClick_select',
            alignment = 'MiddleLeft'
          }
        }
      })
  end

  contentList.attributes.height = #contentList.children * 27
  UI.setXmlTable(globalXml)

  -- select the first item
  Wait.time(onClick_select, 0.2)
end

-- called after the webrequest of downloading an item
-- deletes the placeholder and spawns the downloaded item
function contentDownloadCallback(request, params)
  requestObj = nil

  -- error handling
  if request.is_error or request.response_code ~= 200 then
    print('Error: ' .. request.error)
    return
  end

  -- initiate content spawning
  local spawnTable = { json = request.text }
  if params.replace then
    local replacedObject = getObjectFromGUID(params.replace)
    if replacedObject then
      spawnTable.position = replacedObject.getPosition()
      spawnTable.rotation = replacedObject.getRotation()
      spawnTable.scale    = replacedObject.getScale()
      destroyObject(replacedObject)
    end
  end

  -- if spawned from menu, ping the position
  if params.name then
    spawnTable["callback_function"] = function(obj)
      Player.getPlayers()[1].pingTable(obj.getPosition())
    end
  end

  if pcall(function() spawnObjectJSON(spawnTable) end) then
    print('Object loaded.')
  else
    print('Error loading object.')
  end
end

-- downloading of the library file
function libraryDownloadCallback(request)
  if request.is_error or request.response_code ~= 200 then
    print('error: ' .. request.error)
    return
  end

  local json_response = nil
  if pcall(function () json_response = JSON.decode(request.text) end) then
    formatLibrary(json_response)
    updateDownloadItemList()
  else
    print('error parsing downloaded library')
  end
end

-- loops through an XML table and returns the specified object
---@param ui Table XmlTable (get this via getXmlTable)
---@param id String Id of the object to return
function getXmlTableElementById(ui, id)
  for _, obj in ipairs(ui) do
    if obj.attributes and obj.attributes.id and obj.attributes.id == id then return obj end
    if obj.children then
      local result = getXmlTableElementById(obj.children, id)
      if result then return result end
    end
  end
  return nil
end

---------------------------------------------------------
-- Option Panel related functionality
---------------------------------------------------------

-- called by toggling an option
function onClick_toggleOption(_, id)
  local state = self.UI.getAttribute(id, "isOn")

  -- flip state (and handle stupid "False" value)
  if state == "False" then
    state = true
  else
    state = false
  end

  self.UI.setAttribute(id, "isOn", state)
  applyOptionPanelChange(id, state)
end

-- called by the language selection dropdown
function languageSelected(_, selectedIndex, id)
  optionPanel[id] = LANGUAGES[tonumber(selectedIndex) + 1].code
end

-- returns the ID (position in the table) for a provided language code
function returnLanguageId(code)
  for index, tbl in ipairs(LANGUAGES) do
    if tbl.code == code then
      return index
    end
  end
end

-- called by the resource counter selection dropdown
function resourceCounterSelected(_, selectedIndex, id)
  optionPanel[id] = RESOURCE_OPTIONS[tonumber(selectedIndex) + 1]
end

-- returns the ID for the provided option name
function returnResourceCounterId(name)
  for index, optionName in ipairs(RESOURCE_OPTIONS) do
    if optionName == name then
      return index
    end
  end
end

-- sets the option panel to the correct state (corresponding to 'optionPanel')
function updateOptionPanelState()
  for id, optionValue in pairs(optionPanel) do
    if id == "cardLanguage" and type(optionValue) == "string" then
      local dropdownId = returnLanguageId(optionValue) - 1
      UI.setAttribute(id, "value", dropdownId)
    elseif id == "useResourceCounters" and type(optionValue) == "string" then
      local dropdownId = returnResourceCounterId(optionValue) - 1
      UI.setAttribute(id, "value", dropdownId)
    elseif (type(optionValue) == "boolean" and optionValue)
        or (type(optionValue) == "string" and optionValue)
        or (type(optionValue) == "table" and #optionValue ~= 0) then
      UI.setAttribute(id, "isOn", true)
    else
      UI.setAttribute(id, "isOn", "False")
    end
  end
end

-- handles the applying of option selections and calls the respective functions based
---@param id String ID of the option that was selected or deselected
---@param state Boolean State of the option (true = enabled)
function applyOptionPanelChange(id, state)
  -- option: Snap tags
  if id == "useSnapTags" then
    playmatApi.setLimitSnapsByType(state, "All")
    optionPanel[id] = state

  -- option: Draw 1 button
  elseif id == "showDrawButton" then
    playmatApi.showDrawButton(state, "All")
    optionPanel[id] = state

  -- option: Clickable clue counters
  elseif id == "useClueClickers" then
    playmatApi.clickableClues(state, "All")
    optionPanel[id] = state

    -- update master clue counter
    local counter = guidHandler.call("getObjectByOwnerAndType", { owner = "Mythos", type = "MasterClueCounter" })
    counter.setVar("useClickableCounters", state)

  -- option: Play area snap tags
  elseif id == "playAreaSnapTags" then
    playAreaApi.setLimitSnapsByType(state)
    optionPanel[id] = state

  -- option: Show Title on placing scenarios
  elseif id == "showTitleSplash" then
    optionPanel[id] = state

  -- option: Show clean up helper
  elseif id == "showCleanUpHelper" then
    optionPanel[id] = spawnOrRemoveHelper(state, "Clean Up Helper", {-66, 1.6, 46})

  -- option: Show hand helper for each player
  elseif id == "showHandHelper" then
    for i, color in ipairs(MAT_COLORS) do
      local pos = playmatApi.transformLocalPosition({0.05, 0, -1.182}, color)
      local rot = playmatApi.returnRotation(color)
      optionPanel[id][i] = spawnOrRemoveHelper(state, "Hand Helper", pos, rot)
    end

  -- option: Show search assistant for each player
  elseif id == "showSearchAssistant" then
    for i, color in ipairs(MAT_COLORS) do
      local pos = playmatApi.transformLocalPosition({-0.3, 0, -1.182}, color)
      local rot = playmatApi.returnRotation(color)
      optionPanel[id][i] = spawnOrRemoveHelper(state, "Search Assistant", pos, rot)
    end

  -- option: Show attachment helper
  elseif id == "showAttachmentHelper" then
    optionPanel[id] = spawnOrRemoveHelper(state, "Attachment Helper", {-62, 1.4, 0})

  -- option: Show CYOA campaign guides
  elseif id == "showCYOA" then
    optionPanel[id] = spawnOrRemoveHelper(state, "CYOA Campaign Guides", {39, 1.3, -20})

  -- option: Show custom playmat images
  elseif id == "showCustomPlaymatImages" then
    optionPanel[id] = spawnOrRemoveHelper(state, "Custom Playmat Images", {67.5, 1.6, 37})

  -- option: Show displacement tool
  elseif id == "showDisplacementTool" then
    optionPanel[id] = spawnOrRemoveHelper(state, "Displacement Tool", {-57, 1.6, 46})
  end
end

-- handler for spawn / remove functions of helper objects
---@param state Boolean Contains the state of the option: true = spawn it, false = remove it
---@param name String Name of the helper object
---@param position Vector Position of the object (where it will spawn)
---@param rotation Vector Rotation of the object for spawning (default: {0, 270, 0})
---@return. GUID of the spawnedObj (or nil if object was removed)
function spawnOrRemoveHelper(state, name, position, rotation)
  if (type(state) == "table" and #state == 0) then
    return removeHelperObject(name)
  elseif state then
    Player.getPlayers()[1].pingTable(position)
    return spawnHelperObject(name, position, rotation).getGUID()
  else
    return removeHelperObject(name)
  end
end

-- copies the specified tool (by name) from the option panel source bag
---@param name String Name of the object that should be copied
---@param position Table Desired position of the object
---@param rotation Table Desired rotation of the object (defaults to object's rotation)
function spawnHelperObject(name, position, rotation)
  local sourceBag = guidHandler.call("getObjectByOwnerAndType", { owner = "Mythos", type = "OptionPanelSource" })

  -- error handling for missing sourceBag
  if not sourceBag then
    broadcastToAll("Option panel source bag could not be found!", "Red")
    return
  end

  local spawnTable = { position = position }

  -- only overrride rotation if there is one provided (object's rotation used instead)
  if rotation then
    spawnTable.rotation = rotation
  end

  for _, obj in ipairs(sourceBag.getData().ContainedObjects) do
    if obj["Nickname"] == name then
      spawnTable.data = obj
      spawnTable.callback_function = function(spawnedObj)
        Wait.time(function() spawnedObj.setLock(true) end, 2)
      end
      return spawnObjectData(spawnTable)
    end
  end
end

-- removes the specified tool (by name)
---@param name String Object that should be removed
function removeHelperObject(name)
  -- links objects name to the respective option name (to grab the GUID for removal)
  local referenceTable = {
    ["Clean Up Helper"]       = "showCleanUpHelper",
    ["Hand Helper"]           = "showHandHelper",
    ["Search Assistant"]      = "showSearchAssistant",
    ["Displacement Tool"]     = "showDisplacementTool",
    ["Custom Playmat Images"] = "showCustomPlaymatImages",
    ["Attachment Helper"]     = "showAttachmentHelper",
    ["CYOA Campaign Guides"]  = "showCYOA"
  }

  local data = optionPanel[referenceTable[name]]

  -- if there is a GUID stored, remove that object
  if type(data) == "string" then
    local obj = getObjectFromGUID(data)
    if obj then obj.destruct() end

  -- if it is a table (e.g. for the "Hand Helper", remove all of them)
  elseif type(data) == "table" then
    for _, guid in pairs(data) do
      local obj = getObjectFromGUID(guid)
      if obj then obj.destruct() end
    end
  end
end

-- loads saved options
function loadSettings(newOptions)
  optionPanel = newOptions
  updateOptionPanelState()
  for id, state in pairs(optionPanel) do
    applyOptionPanelChange(id, state)
  end
end

-- loads the default options
function onClick_defaultSettings()
  for id, _ in pairs(optionPanel) do
    local state = false
    -- override for settings that are enabled by default
    if id == "useSnapTags" or id == "showTitleSplash" then
      state = true
    end
    applyOptionPanelChange(id, state)
  end

  -- clean reset of variables
  optionPanel = {
    cardLanguage = "en",
    playAreaSnapTags = true,
    showAttachmentHelper = false,
    showCleanUpHelper = false,
    showCustomPlaymatImages = false,
    showCYOA = false,
    showDisplacementTool = false,
    showDrawButton = false,
    showHandHelper = {},
    showSearchAssistant = {},
    showTitleSplash = true,
    useClueClickers = false,
    useResourceCounters = "disabled",
    useSnapTags = true
  }

  -- update UI
  updateOptionPanelState()
end

-- splash scenario title on setup
function titleSplash(scenarioName)
  if optionPanel['showTitleSplash'] then
    -- if there's any ongoing title being displayed, hide it and cancel the waiting function
    if hideTitleSplashWaitFunctionId then
      Wait.stop(hideTitleSplashWaitFunctionId)
      hideTitleSplashWaitFunctionId = nil
      UI.setAttribute('title_splash', 'active', false)
    end

    -- display scenario name and set a 4 seconds (2 seconds animation and 2 seconds on screen)
    -- wait timer to hide the scenario name
    UI.setValue('title_splash_text', scenarioName)
    UI.show('title_splash')
    hideTitleSplashWaitFunctionId = Wait.time(function()
      UI.hide('title_splash')
      hideTitleSplashWaitFunctionId = nil
    end, 4)

    soundCubeApi.playSoundByName("Deep Bell")
  end
end

---------------------------------------------------------
-- Update notification related functionality
---------------------------------------------------------

-- grabs the latest mod version and release notes from GitHub (called onLoad())
function getModVersion()
  WebRequest.get(SOURCE_REPO .. '/modversion.json', compareVersion)
end

-- compares the modversion with GitHub and possibly shows the update notification
function compareVersion(request)
  if request.is_error then
    log(request.error)
    return
  end

  -- global variable to make it accessible for other functions
  modMeta = JSON.decode(request.text)

  -- stop here if on latest version
  if MOD_VERSION == modMeta["latestVersion"] then return end

  -- stop here if "don't show again" was clicked for this version before
  if acknowledgedUpgradeVersions[modMeta["latestVersion"]] then return end

  updateNotificationLoading()

  -- delay to avoid lagging during onLoad()
  Wait.time(function() UI.show("FinnIcon") end, 1)
end

-- updates the XML update notification based on the mod metadata
function updateNotificationLoading()
  -- grab data
  local highlights = modMeta["releaseHighlights"]

  -- concatenate the release highlights
  local highlightText = "• " .. highlights[1]
  for i, entry in pairs(highlights) do
    if i ~= 1 then
      highlightText = highlightText .. "\n• " .. entry
    end
  end

  -- update the XML UI
  UI.setValue("notificationHeader", "New version available: " .. modMeta["latestVersion"])
  UI.setValue("releaseHighlightText", highlightText)
  UI.setAttribute("highlightRow", "preferredHeight", 20*#highlights)
  UI.setAttribute("updateNotification", "height", 20*#highlights + 125)
end

-- close / don't show again buttons on the update notification
function onClick_notification(_, parameter)
  if parameter == "dontShowAgain" then
    -- this variable tracks if "don't show again" was pressed for a version
    acknowledgedUpgradeVersions[modMeta["latestVersion"]] = true
  end
  UI.hide("FinnIcon")
  UI.hide("updateNotification")
  xmlVisibility["updateNotification"] = false
end