module snnUtil

export  refractoryStatus!, addNewSynapticConn!

using Random

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

function refractoryStatus!(refractoryCounter, refractoryActive, refractoryInactive)
    d1, d2, d3, d4 = size(refractoryCounter)
    for j in 1:d4
        for i in 1:d3
            if refractoryCounter[1, 1, i, j] > 0    # inactive
                view(refractoryActive, 1, 1, i, j) .= 0
                view(refractoryInactive, 1, 1, i, j) .= 1
            else    # active
                view(refractoryActive, 1, 1, i, j) .= 1
                view(refractoryInactive, 1, 1, i, j) .= 0
            end
        end
    end
end

# function frobenius_distance(A, B)
#     # Check if the matrices have the same size
#     if size(A) != size(B)
#         error("The matrices must have the same size")
#     end
#     # Initialize the distance to zero
#     distance = 0.0
#     # Loop over the elements of the matrices and add the squared differences
#     for i in 1:size(A, 1)
#         for j in 1:size(A, 2)
#             distance += (A[i, j] - B[i, j])^2
#         end
#     end
#     # Return the square root of the distance
#     return sqrt(distance)
# end

function addNewSynapticConn!(mask::AbstractArray{<:Any}, x::Number, wRec::AbstractArray{<:Any}, 
                            counter::AbstractArray{<:Any}, n=0; 
                            rng::AbstractRNG=MersenneTwister(1234))
    # println("mask ", mask, size(mask))
    # println("")
    # println("x ", x, size(x))
    # println("")
    # println("wRec ", wRec, size(wRec))
    # println("")
    # println("counter ", counter, size(counter))
    # println("")
    # println("n ", n, size(n))
    # println("")

    # check if mask and wRec have the same size
    if size(mask) != size(wRec)
        error("mask and wRec must have the same size")
    end
    # get the indices of elements in mask that equal x
    indices = findall(x -> x == x, mask)
    alreadySub = findall(x -> x != 0, wRec)    # get already subscribe
    setdiff!(indices, alreadySub)   # remove already sub conn from pool

    remaining = 0
    if n == 0 || n > length(indices)
        remaining = n - length(indices)
        n = length(indices)
    end

    # shuffle the indices using the rng function
    shuffle!(rng, indices)
    # select the first n indices
    n > length(indices) ? println(">>> ", total_x_tobeReplced) : nothing
    selected = indices[1:n]
    # replace the elements in wRec at the selected positions with a
    for i in selected
        wRec[i] = rand(0.01:0.01:0.1)
        if counter !== nothing
            counter[i] = 0   # counting start from 0
        end
    end
    # error("DEBUG    addNewSynapticConn!")
    return remaining
end



































end # module