--[[
    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
--]]
logikraft.cablenodes = {}
logikraft.cables = {}
function logikraft.registerCable(name,nodeboxes,connections,nbconn)
    local nodename = "logikraft:cable_"..name

    minetest.register_node(nodename, {
        tiles = {
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
            "cable_gray.png",
        },
        paramtype = "light",
        drawtype = "nodebox",
        node_box = {
            type = "fixed",
            fixed = nodeboxes
        },
        groups = {circuitry = 1,dig_immediate = 3},
        drop = nil
    })

    -- 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

    logikraft.cablenodes[nodename] = name
    logikraft.cables[name] = {
        nbs = nodeboxes,
        conns = connections2,
        nbToConn = nbconn2
    }
end

function logikraft.cableFromConns(conns)
    for name,cable in pairs(logikraft.cables)
    do
        if table.equals1(conns,cable.conns)
        then return name
        end
    end
    return nil
end

function logikraft.rotateCable(name,r)
    local conn = logikraft.cables[name].conns
    local newconn = {}
    for i,v in ipairs(conn)
    do
        newconn[i] = logikraft.rotate4dir(v,r)
    end
    table.sort(newconn)
    return logikraft.cableFromConns(newconn)
end

function logikraft.connectInCable(name,a,b)
    local conns = table.copy(logikraft.cables[name].conns)
    local cia = logikraft.cables[name].nbToConn[a]
    local cib = logikraft.cables[name].nbToConn[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 logikraft.cableFromConns(conns)
end

function logikraft.connFromDir(name,dir)
    local conns = logikraft.cables[name].conns
    local dir8 = math.pow(2,dir)
    for i,c in ipairs(conns)
    do
        if (math.fmod(c,2*dir8) - dir8 >= 0)
        then 
            return i
        end
    end
    return nil
end

--[[
    Returns {newcablea,newcableb} if the two cables are contiguous
    Returns nil otherwise
    If namea or nameb is nil, no cable is present, and we create a single pin, or we connect to the conn in the direction
    If a or b is nil, we consider that 
--]]
function logikraft.connectContiguousCable(namea,posa,a,nameb,posb,b)
    print("Connecting "..tostring(namea).."("..tostring(a)..") with "..tostring(nameb).."("..tostring(b)..")")
    local dira = (posa.y == posb.y) and (
        (posa.z + 1 == posb.z and posa.x == posb.x and 3) or 
        (posa.x + 1 == posb.x and posa.z == posb.z and 2) or 
        (posa.z - 1 == posb.z and posa.x == posb.x and 1) or 
        (posa.x - 1 == posb.x and posa.z == posb.z and 0) or 
        nil) or nil
    if dira == nil
    then return nil
    end

    if not namea
    then
        namea = logikraft.cableFromConns({logikraft.rotate4dir(4,6-dira)})
        a = 1 -- There is only one nodebox
    end
    if not nameb
    then
        nameb = logikraft.cableFromConns({logikraft.rotate4dir(4,4-dira)})
        b = 1 -- There is only one nodebox
    end

    local cia
    if not a
    then
        cia = logikraft.connFromDir(namea,dira)
        if not cia
        then
            -- We need to add a tip to a
            local connsa = table.copy(logikraft.cables[namea].conns)
            table.insert(connsa,logikraft.rotate4dir(4,6-dira))
            table.sort(connsa)
            namea = logikraft.cableFromConns(connsa)
            cia = logikraft.connFromDir(namea,dira)
        end
    else
        cia = logikraft.cables[namea].nbToConn[a]
    end

    local cib
    if not b
    then
        cib = logikraft.connFromDir(nameb,math.fmod(dira+2,4))
        if not cib
        then
            -- We need to add a tip to b
            local connsb = table.copy(logikraft.cables[nameb].conns)
            table.insert(connsb,logikraft.rotate4dir(4,4-dira))
            table.sort(connsb)
            nameb = logikraft.cableFromConns(connsb)
            cib = logikraft.connFromDir(nameb,math.fmod(dira+2,4))
        end
    else
        cib = logikraft.cables[nameb].nbToConn[b]
    end

    print(dira)
    print(namea)
    print(cia)
    print(nameb)
    print(cib)
    
    local connsa = table.copy(logikraft.cables[namea].conns)
    local connsb = table.copy(logikraft.cables[nameb].conns)
    --print(dump(connsa))
    --print(dump(connsb))
    local cia2 = logikraft.connFromDir(namea,dira)
    local cib2 = logikraft.connFromDir(nameb,math.fmod(dira+2,4))

    -- (nba == nil) -> Need to add dira to the a
    -- (a == nba) -> Already connected
    -- (a ~= nba) -> Need to connect a and nbas
    if (cia2 == nil)
    then
        connsa[cia] = connsa[cia] + math.pow(2,dira)
    elseif (cia ~= cia2)
    then
        -- We take the v size of selected cable
        local v = math.fmod(math.floor(connsa[cia]/16),2)
        connsa[cia] = math.fmod(connsa[cia],16) + math.fmod(connsa[cia2],16) + v*16
        table.remove(connsa,cia2)
    end

    if (cib2 == nil)
    then
        connsb[cib] = connsb[cib] + math.pow(2,math.fmod(dira+2,4))
    elseif (cib ~= cib2)
    then
        -- We take the v size of selected cable
        local v = math.fmod(math.floor(connsb[cib]/16),2)
        connsb[cib] = math.fmod(connsb[cib],16) + math.fmod(connsb[cib2],16) + v*16
        table.remove(connsb,cib2)
    end

    
    table.sort(connsa)
    table.sort(connsb)
    return {logikraft.cableFromConns(connsa),logikraft.cableFromConns(connsb)}

end

function logikraft.disconnectInCable(name,a)
    local conns = table.copy(logikraft.cables[name].conns)
    local cindex = logikraft.cables[name].nbToConn[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 logikraft.cableFromConns(conns)
end

function logikraft.resizeInCable(name,a)
    local conns = table.copy(logikraft.cables[name].conns)
    local cindex = logikraft.cables[name].nbToConn[a]
    
    conns[cindex] = (conns[cindex] >= 16) and (conns[cindex] - 16) or (conns[cindex] + 16)

    table.sort(conns)
    return logikraft.cableFromConns(conns)
end