--[[
    cable_NS1 -> One connection from north to south
    cable_NW1_ES1 -> One connection from north to west, and another from east to south
    cable_NWE8_S8 -> One connection between north, west and east, 8bit single cable from south
    cable_0 -> The one cable without connection
--]]

local nodebox_single = {
    {-0.0625, -0.5, 0.25, 0.0625, -0.375, 0.5},
    {-0.125, -0.5, 0.25, 0.125, -0.25, 0.5}
}
local nodebox_straight = {
    {-0.0625, -0.5, -0.5, 0.0625, -0.375, 0.5},
    {-0.125, -0.5, -0.5, 0.125, -0.25, 0.5}
}
local nodeboxes_corner = {
    {
        {-0.5, -0.5, -0.0625, 0.0625, -0.375, 0.0625}, -- NodeBox1
        {-0.0625, -0.5, 0.0625, 0.0625, -0.375, 0.5}, -- NodeBox2
    },
    {
        {-0.5, -0.5, -0.125, 0.125, -0.25, 0.125}, -- NodeBox1
        {-0.125, -0.5, 0.125, 0.125, -0.25, 0.5}, -- NodeBox2
    }
}
local nodeboxes_jump = {
    {
        {-0.5, -0.5, -0.0625, -0.1875, -0.375, 0.0625}, -- NodeBox2
        {0.1875, -0.5, -0.0625, 0.5, -0.375, 0.0625}, -- NodeBox3
        {-0.3125, -0.1875, -0.0625, 0.3125, -0.0625, 0.0625}, -- NodeBox4
        {-0.3125, -0.375, -0.0625, -0.1875, -0.1875, 0.0625}, -- NodeBox5
        {0.1875, -0.375, -0.0625, 0.3125, -0.1875, 0.0625}, -- NodeBox6
    },
    {
        {-0.5, -0.5, -0.125, -0.1875, -0.25, 0.125}, -- NodeBox2
        {0.1875, -0.5, -0.125, 0.5, -0.25, 0.125}, -- NodeBox3
        {-0.4375, -0.1875, -0.125, 0.4375, 0.0625, 0.125}, -- NodeBox4
        {-0.4375, -0.25, -0.125, -0.1875, -0.1875, 0.125}, -- NodeBox5
        {0.1875, -0.25, -0.125, 0.4375, -0.1875, 0.125}, -- NodeBox6
    }
}
local nodeboxes_ccorner =  {
    {
        {-0.5, -0.5, -0.0625, -0.1875, -0.375, 0.0625}, -- NodeBox1
        {-0.0625, -0.5, 0.1875, 0.0625, -0.375, 0.5}, -- NodeBox2
        {-0.3125, -0.5, 0.0625, -0.1875, -0.375, 0.3125}, -- NodeBox3
        {-0.1875, -0.5, 0.1875, -0.0625, -0.375, 0.3125}, -- NodeBox4
    },
    {
        {-0.5, -0.5, -0.125, -0.125, -0.25, 0.125}, -- NodeBox1
        {-0.125, -0.5, 0.125, 0.125, -0.25, 0.5}, -- NodeBox2
        {-0.375, -0.5, 0.125, -0.125, -0.25, 0.375}, -- NodeBox4
    }
}
local nodeboxes_tri = {
    {
        {-0.5, -0.5, -0.0625, 0.5, -0.375, 0.0625}, -- NodeBox1
        {-0.0625, -0.5, 0.0625, 0.0625, -0.375, 0.5}, -- NodeBox2
    },
    {
        {-0.5, -0.5, -0.125, 0.5, -0.25, 0.125}, -- NodeBox1
        {-0.125, -0.5, 0.125, 0.125, -0.25, 0.5}, -- NodeBox2
    }
}
local nodeboxes_cross = {
    {
        {-0.5, -0.5, -0.0625, 0.5, -0.375, 0.0625}, -- NodeBox1
        {-0.0625, -0.5, 0.0625, 0.0625, -0.375, 0.5}, -- NodeBox2
        {-0.0625, -0.5, -0.5, 0.0625, -0.375, -0.0625}, -- NodeBox3
    },
    {
        {-0.5, -0.5, -0.125, 0.5, -0.25, 0.125}, -- NodeBox1
        {-0.125, -0.5, 0.125, 0.125, -0.25, 0.5}, -- NodeBox2
        {-0.125, -0.5, -0.5, 0.125, -0.25, -0.125}, -- NodeBox3
    }
}

local nodebox_disconnected = {-0.125, -0.5, -0.125, 0.125, -0.25, 0.125}

local function rotateNodebox(nb,rot)
    return
        (math.fmod(rot,4)==0) and {nb[1],nb[2],nb[3],nb[4],nb[5],nb[6]} or
        (math.fmod(rot,4)==1) and {nb[3],nb[2],-nb[1],nb[6],nb[5],-nb[4]} or
        (math.fmod(rot,4)==2) and {-nb[1],nb[2],-nb[3],-nb[4],nb[5],-nb[6]} or
        (math.fmod(rot,4)==3) and {-nb[3],nb[2],nb[1],-nb[6],nb[5],nb[4]} or
        nb -- Should not happen
end
local function rotate4dir(conn,r)
    local function rotate4dirOnce(conn)
        return math.floor(conn/2) + 8*math.fmod(conn,2)
    end
    local x = math.fmod(conn,16)
    for i=1,r do
        x = rotate4dirOnce(x)
    end
    return (conn - math.fmod(conn,16) + x)
end

local function constArray(val,size)
    local t = {}
    for i=1,size
    do
        table.insert(t,val)
    end
    return t
end

--[[
    name: the name of the cable
    nodeboxes: All the rendered nodeboxes
    connections: A list of connections between NSEW (N=8,E=4,S=2,W=1), +16 when it is 8bit
        ex: {4+2,16+1} -> ES + W8
    nbconn: Which correspond each nodebox correspond to
        ex: {1,1,2,1} -> nodeboxes 1,2,3 correspond to connection ES, and nodebox 2 correspond to connection W
--]]
circuits.cablesnb = {}
circuits.cablesconn = {}
circuits.cablesnbconn = {}
local function createCables(name,nodeboxes,connections,nbconn)
    minetest.register_node("circuits:cable_"..name, {
        tiles = {
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
        },
        drawtype = "nodebox",
        paramtype = "light",
        node_box = {
            type = "fixed",
            fixed = nodeboxes
        },
        groups = {circuitry = 1,dig_immediate = 3}
    })

    if name == "EW8_N1_S1"
    then print(dump(connections)) end

    -- We sort the connections and nbconn
    local connections2 = table.copy(connections)
    table.sort(connections2)
    local perm = table.arrperm(connections,connections2)
    local nbconn2 = {}
    for i,v in ipairs(nbconn)
    do
        nbconn2[i] = perm[v]
    end
    if name == "EW8_N1_S1"
    then print(dump(connections2)) end

    circuits.cablesnb[name] = nodeboxes
    circuits.cablesconn[name] = connections2
    circuits.cablesnbconn[name] = nbconn2
end

-- cable_NSEW0
for v=1,2 do
    createCables("NSEW"..tostring((v-1)*7+1),nodeboxes_cross[v],{(v-1)*16+8+4+2+1},constArray(1,#nodeboxes_cross[v]))
end

--[
-- cable_NW0_SE0
-- cable_NE0_SW0
-- cable_NS0_EW0
for v0=1,2 do
for v1=1,2 do
    local nodeboxes = {}
    local nbconn = {}
    for _,nb in ipairs(nodeboxes_ccorner[v0]) do 
        table.insert(nodeboxes, nb)
        table.insert(nbconn, 1)
    end
    for _,nb in ipairs(nodeboxes_ccorner[v1]) do 
        table.insert(nodeboxes, rotateNodebox(nb,2))
        table.insert(nbconn, 2)
    end
    createCables("NW"..tostring((v0-1)*7+1).."_SE"..tostring((v1-1)*7+1),nodeboxes,{(v0-1)*16+8+1,(v1-1)*16+4+2},nbconn)

    local nodeboxes = {}
    local nbconn = {}
    for _,nb in ipairs(nodeboxes_ccorner[v0]) do 
        table.insert(nodeboxes, rotateNodebox(nb,1))
        table.insert(nbconn, 1)
    end
    for _,nb in ipairs(nodeboxes_ccorner[v1]) do 
        table.insert(nodeboxes, rotateNodebox(nb,3))
        table.insert(nbconn, 2)
    end
    createCables("NE"..tostring((v0-1)*7+1).."_SW"..tostring((v1-1)*7+1),nodeboxes,{(v0-1)*16+8+4,(v1-1)*16+2+1},nbconn)

    local nodeboxes = {}
    local nbconn = {}
    table.insert(nodeboxes, nodebox_straight[v0]) 
    table.insert(nbconn, 1)
    for _,nb in ipairs(nodeboxes_jump[v1]) do 
        table.insert(nodeboxes, rotateNodebox(nb,2))
        table.insert(nbconn, 2)
    end
    createCables("NS"..tostring((v0-1)*7+1).."_EW"..tostring((v1-1)*7+1),nodeboxes,{(v0-1)*16+8+2,(v1-1)*16+4+1},nbconn)
end
end

-- cable_AB0_C0_D0 -- ("NW","NE","SE","SW") * (/ + C0 + D0 + C0D0)
-- cable_AB0_C0_D0 -- ("NS" "EW") * (/ + C0 + D0 + C0D0)
for v=1,2 do
for v1=0,2 do
for v2=0,2 do
    for r,rn in ipairs({{"NW","E","S"},{"NE","S","W"},{"SE","W","N"},{"SW","N","E"}}) do
        local nodeboxes = {}
        local nbconn = {}
        local connz = {rotate4dir((v-1)*16+8+1,r-1)}
        for _,nb in ipairs(nodeboxes_corner[v]) do 
            table.insert(nodeboxes, rotateNodebox(nb,r-1))
            table.insert(nbconn, 1)
        end
        if v1 ~= 0 then
            table.insert(nodeboxes, rotateNodebox(nodebox_single[v1],r))
            table.insert(nbconn, 2)
            table.insert(connz,rotate4dir((v1-1)*16+4,r-1))
        end
        if v2 ~= 0 then
            table.insert(nodeboxes, rotateNodebox(nodebox_single[v2],r+1))
            table.insert(nbconn, v1==0 and 2 or 3)
            table.insert(connz,rotate4dir((v2-1)*16+2,r-1))
        end
        createCables(
            rn[1]..tostring((v-1)*7+1)..
            (v1~=0 and ("_"..rn[2]..tostring((v1-1)*7+1)) or "")..
            (v2~=0 and ("_"..rn[3]..tostring((v2-1)*7+1)) or "")
            ,nodeboxes,connz,nbconn
        )
    end

    for r,rn in ipairs({{"NS","E","W"},{"EW","N","S"}}) do
        local nodeboxes = {}
        local nbconn = {}
        local connz = {rotate4dir((v-1)*16+8+2,r-1)}
        table.insert(nodeboxes, rotateNodebox(nodebox_straight[v],r-1))
        table.insert(nbconn, 1)
        if v1 ~= 0 then
            table.insert(nodeboxes, rotateNodebox(nodebox_single[v1],r))
            table.insert(nbconn, 2)
            table.insert(connz,rotate4dir((v1-1)*16+4,r-1))
        end
        if v2 ~= 0 then
            table.insert(nodeboxes, rotateNodebox(nodebox_single[v2],r+2))
            table.insert(nbconn, v1==0 and 2 or 3)
            table.insert(connz,rotate4dir((v2-1)*16+1,r-1))
        end
        createCables(
            rn[1]..tostring((v-1)*7+1)..
            (v1~=0 and ("_"..rn[2]..tostring((v1-1)*7+1)) or "")..
            (v2~=0 and ("_"..rn[3]..tostring((v2-1)*7+1)) or ""),
            nodeboxes,connz,nbconn
        )
    end
end
end
end

-- "cable_A0_B0_C0_D0" -- (n s e w ns ...)
for v1=0,2 do
for v2=0,2 do
for v3=0,2 do
for v4=0,2 do
    
    local nodeboxes = {}
    local nbconn = {}
    local name = ""
    local connz = {}
    if v1 ~= 0 then
        table.insert(nodeboxes, rotateNodebox(nodebox_single[v1],0))
        table.insert(nbconn, 1)
        table.insert(connz,(v1-1)*16+8)
        name = name.."_N"..tostring((v1-1)*7+1)
    end
    if v2 ~= 0 then
        table.insert(nodeboxes, rotateNodebox(nodebox_single[v2],1))
        table.insert(nbconn, #nbconn+1)
        table.insert(connz,(v2-1)*16+4)
        name = name.."_E"..tostring((v2-1)*7+1)
    end
    if v3 ~= 0 then
        table.insert(nodeboxes, rotateNodebox(nodebox_single[v3],2))
        table.insert(nbconn, #nbconn+1)
        table.insert(connz,(v3-1)*16+2)
        name = name.."_S"..tostring((v3-1)*7+1)
    end
    if v4 ~= 0 then
        table.insert(nodeboxes, rotateNodebox(nodebox_single[v4],3))
        table.insert(nbconn, #nbconn+1)
        table.insert(connz,(v4-1)*16+1)
        name = name.."_W"..tostring((v4-1)*7+1)
    end
    if name == "" then
        table.insert(nodeboxes, nodebox_disconnected)
        table.insert(nbconn, 1)
        table.insert(connz,(v1-1)*16+0) -- special case of no connection
        name = "_zero"
    end
         
    createCables(string.sub(name,2,-1),nodeboxes,connz,nbconn)

end
end
end
end

-- "cable_ABC0_D0" -- ("NEW","NES","ESW","SWN") * (/ + D0)
for v=1,2 do
for v1=0,2 do
    for r,rn in ipairs({{"NEW","S"},{"NES","W"},{"ESW","N"},{"SWN","E"}}) do
        local nodeboxes = {}
        local nbconn = {}
        local connz = {rotate4dir((v-1)*16+8+4+1,r-1)}
        for _,nb in ipairs(nodeboxes_tri[v]) do 
            table.insert(nodeboxes, rotateNodebox(nb,r-1))
            table.insert(nbconn, 1)
        end
        if v1 ~= 0 then
            table.insert(nodeboxes, rotateNodebox(nodebox_single[v1],r+1))
            table.insert(nbconn, 2)
            table.insert(connz,rotate4dir((v1-1)*16+2,r-1))
        end
        createCables(
            rn[1]..tostring((v-1)*7+1)..
            (v1~=0 and ("_"..rn[2]..tostring((v1-1)*7+1)) or ""),
            nodeboxes,connz,nbconn
        )
    end
end
end
--]]

circuits.cablesfromconn = table.invert(circuits.cablesconn)


function circuits.rotateCable(name,r)
    local conn = circuits.cablesconn[name]
    local newconn = {}
    for i,v in ipairs(conn)
    do
        newconn[i] = rotate4dir(v,r)
    end
    table.sort(newconn)
    return table.getkey1(circuits.cablesconn,newconn)
end

function circuits.connectInCable(name,a,b)
    local conns = table.copy(circuits.cablesconn[name])
    local cia = circuits.cablesnbconn[name][a]
    local cib = circuits.cablesnbconn[name][b]
    local conna = conns[cia]
    local connb = conns[cib]

    -- If mismatch, v is that of firstly selected cable
    local v = math.fmod(math.floor(conna/16),2)
    conns[cia] = math.fmod(conna,16) + math.fmod(connb,16) + v*16
    table.remove(conns,cib)
    
    table.sort(conns)
    return table.getkey1(circuits.cablesconn,conns)
end

function circuits.disconnectInCable(name,a)
    local conns = table.copy(circuits.cablesconn[name])
    local cindex = circuits.cablesnbconn[name][a]
    local conn = conns[cindex]
    
    table.remove(conns,cindex)

    if not (conn == 1 or conn == 2 or conn == 4 or conn == 8 or conn == 17 or conn == 18 or conn == 20 or conn == 24)
    then -- The connection was more than one-sided, so we recreate the «tips»
        if math.fmod(math.floor(conn/1),2)==1
        then table.insert(conns,conn>=16 and 17 or 1) end
        if math.fmod(math.floor(conn/2),2)==1
        then table.insert(conns,conn>=16 and 18 or 2) end
        if math.fmod(math.floor(conn/4),2)==1
        then table.insert(conns,conn>=16 and 20 or 4) end
        if math.fmod(math.floor(conn/8),2)==1
        then table.insert(conns,conn>=16 and 24 or 8) end
    end

    table.sort(conns)
    return table.getkey1(circuits.cablesconn,conns)
end