--[[
  ReAction.lua

  The ReAction core manages several collections:
    - modules (via AceAddon)
    - bars
    - bar-type constructors
    
  and publishes events when those collections change. It also implements a couple properties
  and has a couple convenience methods which drill down to particular modules.
  
  Most of the "real work" of the addon happens in Bar.lua, Overlay.lua, State.lua, and the various modules.

  Events (with handler arguments):
  --------------------------------
  "OnCreateBar" (bar, name)             : after a bar object is created
  "OnDestroyBar" (bar, name)            : before a bar object is destroyed
  "OnEraseBar" (bar, name)              : before a bar config is removed from the profile db
  "OnRenameBar" (bar, oldname, newname) : after a bar is renamed
  "OnRefreshBar" (bar, name)            : after a bar's state has been updated
  "OnConfigModeChanged" (mode)          : after the config mode is changed

  ReAction is also an AceAddon-3.0 and contains an AceDB-3.0, which in turn publish more events.
]]--
local _, addonTable = ...
local ReAction = LibStub("AceAddon-3.0"):NewAddon( "ReAction",
  "AceEvent-3.0"
)
ReAction.version = "1.0"
addonTable.ReAction = ReAction

------ LIBRARIES ------
local callbacks = LibStub("CallbackHandler-1.0"):New(ReAction)
local LKB = LibStub("LibKeyBound-1.0")
local L = LibStub("AceLocale-3.0"):GetLocale("ReAction")
ReAction.L = L
ReAction.LKB = LKB
ReAction.callbacks = callbacks

------ PRIVATE ------
local private = { }
local bars = {}
local defaultBarConfig = {}


local SelectBar, DestroyBar, InitializeBars, TearDownBars, DeepCopy
do
  local pcall = pcall
  local geterrorhandler = geterrorhandler
  local self = ReAction
  local inited = false

  function SelectBar(x)
    local bar, name
    if type(x) == "string" then
      name = x
      bar = self:GetBar(name)
    else
      for k,v in pairs(bars) do
        if v == x then
          name = k
          bar = x
        end
      end
    end
    return bar, name
  end

  function DestroyBar(x)
    local bar, name = SelectBar(x)
    if bar and name then
      bars[name] = nil
      callbacks:Fire("OnDestroyBar", bar, name)
      bar:Destroy()
    end
  end

  function InitializeBars()
    if not inited then
      for name, config in pairs(self.db.profile.bars) do
        if config then
          self:CreateBar(name, config)
        end
      end
      -- re-anchor and refresh in case anchor order does not match init order
      for name, bar in pairs(bars) do
        bar:ApplyAnchor()
        callbacks:Fire("OnRefreshBar", bar, name)
      end
      inited = true
    end
  end

  function TearDownBars()
    for name, bar in pairs(bars) do
      if bar then
        bars[name] = DestroyBar(bar)
      end
    end
    inited = false
  end

  function DeepCopy(x)
    if type(x) ~= "table" then
      return x
    end
    local r = {}
    for k,v in pairs(x) do
      r[k] = DeepCopy(v)
    end
    return r
  end

end


------ HANDLERS ------
function ReAction:OnInitialize()
  self.db = LibStub("AceDB-3.0"):New("ReAction_DB", 
    { 
      profile = {
        bars = { },
        defaultBar = { },
      }
    },
    true -- use global 'Default' (locale-specific)
  )
  LKB.RegisterCallback(self,"LIBKEYBOUND_ENABLED")
  LKB.RegisterCallback(self,"LIBKEYBOUND_DISABLED")

  self:RegisterEvent("PLAYER_REGEN_DISABLED")

  self:InitializeOptions()
end

function ReAction:OnEnable()
  InitializeBars()
end

function ReAction:OnDisable()
  TearDownBars()
end

function ReAction:PLAYER_REGEN_DISABLED()
  if private.configMode == true then
    self:UserError(L["ReAction config mode disabled during combat."])
    self:SetConfigMode(false)
    self:SetKeybindMode(false)
    self:CloseEditor()
  end
end

function ReAction:LIBKEYBOUND_ENABLED( evt )
  self:SetKeybindMode(true)
end

function ReAction:LIBKEYBOUND_DISABLED( evt )
  return self:SetKeybindMode(false)
end



------ API ------

function ReAction:UserError(msg)
  -- any user errors should be flashed to the UIErrorsFrame
  UIErrorsFrame:AddMessage(msg)
end

function ReAction:RebuildAll()
  TearDownBars()
  InitializeBars()
end


-- usage:
--  (1) ReAction:CreateBar(name, [cfgTable])
--  (2) ReAction:CreateBar(name, "barType", [nRows], [nCols], [btnSize], [btnSpacing])
function ReAction:CreateBar(name, config, ...)
  local profile = self.db.profile

  if name then
    if bars[name] then
      self:UserError(format(L["ReAction: name '%s' already in use"],name))
      return nil
    end
  else
    local prefix = L["Bar "]
    local i = 1
    repeat
      name = prefix..i
      i = i + 1
    until bars[name] == nil
  end

  if type(config) == "string" then
    config = defaultBarConfig[config]
    if not config then
      error(("ReAction:CreateBar() - unknown bar type '%s'"):format(tostring(select(1,...))))
    end
    config = DeepCopy(config)
    config.btnRows    = select(1,...) or config.btnRows    or 1
    config.btnColumns = select(2,...) or config.btnColumns or 12
    config.btnWidth   = select(3,...) or config.btnWidth   or 36
    config.btnHeight  = select(3,...) or config.btnHeight  or 36
    config.spacing    = select(4,...) or config.spacing    or 3
    config.width      = config.width or config.btnColumns*(config.btnWidth + config.spacing) + 1
    config.height     = config.height or config.btnRows*(config.btnHeight + config.spacing) + 1
    config.anchor     = config.anchor or "UIParent"
    config.point      = config.point or "BOTTOM"
    config.relpoint   = config.relpoint or "BOTTOM"
    config.y          = config.y or 200
    config.x          = config.x or 0
  end
  config = config or profile.bars[name] or DeepCopy(profile.defaultBar)

  profile.bars[name] = config
  local bar = self.Bar:New( name, config )  -- ReAction.Bar defined in Bar.lua
  bars[name] = bar
  callbacks:Fire("OnCreateBar", bar, name)
  if private.configMode then
    bar:ShowControls(true)
  end

  return bar
end

function ReAction:EraseBar(x)
  local bar, name = SelectBar(x)
  if bar and name then
    callbacks:Fire("OnEraseBar", bar, name)
    DestroyBar(bar)
    self.db.profile.bars[name] = nil
  end
end

function ReAction:GetBar(name)
  return bars[name]
end

-- returns pairs of name, bar
function ReAction:IterateBars()
  return pairs(bars)
end

function ReAction:RenameBar(x, newname)
  local bar, name = SelectBar(x)
  if type(newname) ~= "string" then
    error("ReAction:RenameBar() - second argument must be a string")
  end
  if bar and name and #newname > 0 then
    if newname == name then
      return
    end
    if bars[newname] then
      self:UserError(format(L["ReAction: name '%s' already in use"],newname))
    else
      bars[newname], bars[name] = bars[name], nil
      bar:SetName(newname or "")
      local cfg = self.db.profile.bars
      cfg[newname], cfg[name] = cfg[name], nil
      callbacks:Fire("OnRenameBar", bar, name, newname)
    end
  end
end

function ReAction:RefreshBar(x)
  local bar, name = SelectBar(x)
  if bar and name then
    callbacks:Fire("OnRefreshBar", bar, name)
  end
end

function ReAction:RegisterBarType( name, config, isDefaultChoice )
  defaultBarConfig[name] = config
  if isDefaultChoice then
    private.defaultBarConfigChoice = name
  end
  self:RefreshEditor()
end

function ReAction:UnregisterBarType( name )
  defaultBarConfig[name] = nil
  if private.defaultBarConfigChoice == name then
    private.defaultBarConfigChoice = nil
  end
  self:RefreshEditor()
end

function ReAction:IterateBarTypes()
  return pairs(defaultBarConfig)
end

function ReAction:GetBarTypeConfig(name)
  if name then
    return defaultBarConfig[name]
  end
end

function ReAction:GetBarTypeOptions( fill )
  fill = fill or { }
  for k in self:IterateBarTypes() do
    fill[k] = k
  end
  return fill
end

function ReAction:GetDefaultBarType()
  return private.defaultBarConfigChoice
end

function ReAction:SetConfigMode( mode )
  if mode ~= private.configMode then
    private.configMode = mode
    callbacks:Fire("OnConfigModeChanged", mode)
  end
end

function ReAction:GetConfigMode()
  return private.configMode
end

function ReAction:SetKeybindMode( mode )
  if mode ~= private.kbMode then
    if mode then
      LKB:Activate()
    else
      LKB:Deactivate()
    end
    private.kbMode = LKB:IsShown() or false
  end
end

function ReAction:GetKeybindMode( mode )
  return private.kbMode
end