module type
  
export MCTSNode

# ---------------------------------------------- 100 --------------------------------------------- #


""" a node for MCTS search tree

# Arguments
  - `state::T`
    a state of a game. Can be a Dict or something else. 
  - `visits::Integer `
    number of time the game visits this state
  - `stateValue::Float64`
    state value
  - `children::Dict{T, MCTSNode}`
    children node

# Return
  - `nothing`
# Example
```jldoctest
julia> state = Dict(
        :info=> Dict(),           # keyword info
        :thoughtHistory=> Dict(
          :question=> _,
          :thought_1=> _, 
          :action_1=> _, 
          :observation_1=> _, 
          :thought_2=> _,
          ...
          )  
        )
```

# TODO
  [] update docstring

# Signature
"""
mutable struct MCTSNode{T1<:AbstractDict, T2<:AbstractString}
  nodekey::T2
  state::T1
  visits::Integer
  progressvalue::Number # estimate value by LLM's reasoning
  statevalue::Number  # store discounted commulative reward (gather from its child node)
  reward::Number  # this node's own reward
  isterminal::Bool
  parent::Union{MCTSNode, Nothing} 
  children::Dict{String, MCTSNode}
end































































end # module type