--- **Core (WIP)** -- Base class to allow the modeling of processes to achieve Goals.
--
-- ===
-- 
-- GOAL models processes that have an objective with a defined achievement. Derived classes implement the ways how the achievements can be realized.
-- 
-- ===
-- 
-- ### Author: **FlightControl**
-- 
-- ===
-- 
-- @module Core.Goal
-- @image Core_Goal.JPG

do -- Goal

  --- @type GOAL
  -- @extends Core.Fsm#FSM


  --- GOAL models processes that have an objective with a defined achievement. Derived classes implement the ways how the achievements can be realized.
  -- 
  -- ## 1. GOAL constructor
  --   
  --   * @{#GOAL.New}(): Creates a new GOAL object.
  -- 
  -- ## 2. GOAL is a finite state machine (FSM).
  -- 
  -- ### 2.1 GOAL States
  -- 
  --   * **Pending**: The goal object is in progress.
  --   * **Achieved**: The goal objective is Achieved.
  -- 
  -- ### 2.2 GOAL Events
  -- 
  --   * **Achieved**: Set the goal objective to Achieved.
  -- 
  -- @field #GOAL
  GOAL = {
    ClassName = "GOAL",
  }
  
  --- @field #table GOAL.Players
  GOAL.Players = {}

  --- @field #number GOAL.TotalContributions
  GOAL.TotalContributions = 0
  
  --- GOAL Constructor.
  -- @param #GOAL self
  -- @return #GOAL
  function GOAL:New()
  
    local self = BASE:Inherit( self, FSM:New() ) -- #GOAL
    self:F( {} )

    --- Achieved State for GOAL
    -- @field GOAL.Achieved

    --- Achieved State Handler OnLeave for GOAL
    -- @function [parent=#GOAL] OnLeaveAchieved
    -- @param #GOAL self
    -- @param #string From
    -- @param #string Event
    -- @param #string To
    -- @return #boolean

    --- Achieved State Handler OnEnter for GOAL
    -- @function [parent=#GOAL] OnEnterAchieved
    -- @param #GOAL self
    -- @param #string From
    -- @param #string Event
    -- @param #string To
    
    
    self:SetStartState( "Pending" )
    self:AddTransition( "*",  "Achieved", "Achieved" )
    
    --- Achieved Handler OnBefore for GOAL
    -- @function [parent=#GOAL] OnBeforeAchieved
    -- @param #GOAL self
    -- @param #string From
    -- @param #string Event
    -- @param #string To
    -- @return #boolean
    
    --- Achieved Handler OnAfter for GOAL
    -- @function [parent=#GOAL] OnAfterAchieved
    -- @param #GOAL self
    -- @param #string From
    -- @param #string Event
    -- @param #string To
    
    --- Achieved Trigger for GOAL
    -- @function [parent=#GOAL] Achieved
    -- @param #GOAL self
    
    --- Achieved Asynchronous Trigger for GOAL
    -- @function [parent=#GOAL] __Achieved
    -- @param #GOAL self
    -- @param #number Delay
    
    self:SetEventPriority( 5 )

    return self
  end
  
  
  --- @param #GOAL self
  -- @param #string PlayerName
  function GOAL:AddPlayerContribution( PlayerName )
    self.Players[PlayerName] = self.Players[PlayerName] or 0
    self.Players[PlayerName] = self.Players[PlayerName] + 1
    self.TotalContributions = self.TotalContributions + 1
  end
  
  
  --- @param #GOAL self
  -- @param #number Player contribution.
  function GOAL:GetPlayerContribution( PlayerName )
    return self.Players[PlayerName] or 0 
  end

  
  --- @param #GOAL self
  function GOAL:GetPlayerContributions()
    return self.Players or {}
  end

  
  --- @param #GOAL self
  function GOAL:GetTotalContributions()
    return self.TotalContributions or 0
  end
  
  
  
  --- @param #GOAL self
  -- @return #boolean true if the goal is Achieved
  function GOAL:IsAchieved()
    return self:Is( "Achieved" )
  end

end