;;; ---------------------------------------------------------------------------
;;; @title The Ethereum Name Service registry.
;;; @author Daniel Ellison <daniel@syrinx.net>

;;; @deprecated This file is only kept as a reference.

(seq

  ;; --------------------------------------------------------------------------
  ;; Constant definitions.

  ;; Memory layout.
  (def 'node-bytes  0x00)
  (def 'label-bytes 0x20)
  (def 'call-result 0x40)

  ;; Struct: Record
  (def 'resolver 0x00) ; address
  (def 'owner    0x20) ; address
  (def 'ttl      0x40) ; uint64

  ;; Precomputed function IDs.
  (def 'get-node-owner    0x02571be3) ; owner(bytes32)
  (def 'get-node-resolver 0x0178b8bf) ; resolver(bytes32)
  (def 'get-node-ttl      0x16a25cbd) ; ttl(bytes32)
  (def 'set-node-owner    0x5b0fc9c3) ; setOwner(bytes32,address)
  (def 'set-subnode-owner 0x06ab5923) ; setSubnodeOwner(bytes32,bytes32,address)
  (def 'set-node-resolver 0x1896f70a) ; setResolver(bytes32,address)
  (def 'set-node-ttl      0x14ab9038) ; setTTL(bytes32,uint64)

  ;; Jumping here causes an EVM error.
  (def 'invalid-location 0x02)

  ;; --------------------------------------------------------------------------
  ;; @notice Shifts the leftmost 4 bytes of a 32-byte number right by 28 bytes.
  ;; @param input A 32-byte number.

  (def 'shift-right (input)
    (div input (exp 2 224)))

  ;; --------------------------------------------------------------------------
  ;; @notice Determines whether the supplied function ID matches a known
  ;;         function hash and executes <code-body> if so.
  ;; @dev The function ID is in the leftmost four bytes of the call data.
  ;; @param function-hash The four-byte hash of a known function signature.
  ;; @param code-body The code to run in the case of a match.

  (def 'function (function-hash code-body)
    (when (= (shift-right (calldataload 0x00)) function-hash)
      code-body))

  ;; --------------------------------------------------------------------------
  ;; @notice Calculates record location for the node and label passed in.
  ;; @param node The parent node.
  ;; @param label The hash of the subnode label.

  (def 'get-record (node label)
    (seq
      (mstore node-bytes node)
      (mstore label-bytes label)
      (sha3 node-bytes 64)))

  ;; --------------------------------------------------------------------------
  ;; @notice Retrieves owner from node record.
  ;; @param node Get owner of this node.

  (def 'get-owner (node)
    (sload (+ node owner)))

  ;; --------------------------------------------------------------------------
  ;; @notice Stores new owner in node record.
  ;; @param node Set owner of this node.
  ;; @param new-owner New owner of this node.

  (def 'set-owner (node new-owner)
    (sstore (+ node owner) new-owner))

  ;; --------------------------------------------------------------------------
  ;; @notice Stores new subnode owner in node record.
  ;; @param node Set owner of this node.
  ;; @param label The hash of the label specifying the subnode.
  ;; @param new-owner New owner of the subnode.

  (def 'set-subowner (node label new-owner)
    (sstore (+ (get-record node label) owner) new-owner))

  ;; --------------------------------------------------------------------------
  ;; @notice Retrieves resolver from node record.
  ;; @param node Get resolver of this node.

  (def 'get-resolver (node)
    (sload node))

  ;; --------------------------------------------------------------------------
  ;; @notice Stores new resolver in node record.
  ;; @param node Set resolver of this node.
  ;; @param new-resolver New resolver for this node.

  (def 'set-resolver (node new-resolver)
    (sstore node new-resolver))

  ;; --------------------------------------------------------------------------
  ;; @notice Retrieves TTL From node record.
  ;; @param node Get TTL of this node.

  (def 'get-ttl (node)
    (sload (+ node ttl)))

  ;; --------------------------------------------------------------------------
  ;; @notice Stores new TTL in node record.
  ;; @param node Set TTL of this node.
  ;; @param new-resolver New TTL for this node.

  (def 'set-ttl (node new-ttl)
    (sstore (+ node ttl) new-ttl))

  ;; --------------------------------------------------------------------------
  ;; @notice Checks that the caller is the node owner.
  ;; @param node Check owner of this node.

  (def 'only-node-owner (node)
    (when (!= (caller) (get-owner node))
      (jump invalid-location)))

  ;; --------------------------------------------------------------------------
  ;; INIT

  ;; Set the owner of the root node (0x00) to the deploying account.
  (set-owner 0x00 (caller))

  ;; --------------------------------------------------------------------------
  ;; CODE

  (returnlll
    (seq

      ;; ----------------------------------------------------------------------
      ;; @notice Returns the address of the resolver for the specified node.
      ;; @dev Signature: resolver(bytes32)
      ;; @param node Return this node's resolver.
      ;; @return The associated resolver.

      (def 'node (calldataload 0x04))

      (function get-node-resolver
        (seq

          ;; Get the node's resolver and save it.
          (mstore call-result (get-resolver node))

          ;; Return result.
          (return call-result 32)))

      ;; ----------------------------------------------------------------------
      ;; @notice Returns the address that owns the specified node.
      ;; @dev Signature: owner(bytes32)
      ;; @param node Return this node's owner.
      ;; @return The associated address.

      (def 'node (calldataload 0x04))

      (function get-node-owner
        (seq

          ;; Get the node's owner and save it.
          (mstore call-result (get-owner node))

          ;; Return result.
          (return call-result 32)))

      ;; ----------------------------------------------------------------------
      ;; @notice Returns the TTL of a node and any records associated with it.
      ;; @dev Signature: ttl(bytes32)
      ;; @param node Return this node's TTL.
      ;; @return The node's TTL.

      (def 'node (calldataload 0x04))

      (function get-node-ttl
        (seq

          ;; Get the node's TTL and save it.
          (mstore call-result (get-ttl node))

          ;; Return result.
          (return call-result 32)))

      ;; ----------------------------------------------------------------------
      ;; @notice Transfers ownership of a node to a new address. May only be
      ;;         called by the current owner of the node.
      ;; @dev Signature: setOwner(bytes32,address)
      ;; @param node The node to transfer ownership of.
      ;; @param new-owner The address of the new owner.

      (def 'node (calldataload 0x04))
      (def 'new-owner (calldataload 0x24))

      (function set-node-owner
        (seq (only-node-owner node)

          ;; Transfer ownership by storing passed-in address.
          (set-owner node new-owner)

          ;; Emit an event about the transfer.
          ;; Transfer(bytes32 indexed node, address owner);
          (mstore call-result new-owner)
          (log2 call-result 32
              (sha3 0x00 (lit 0x00 "Transfer(bytes32,address)")) node)

          ;; Nothing to return.
          (stop)))

      ;; ----------------------------------------------------------------------
      ;; @notice Transfers ownership of a subnode to a new address. May only be
      ;;         called by the owner of the parent node.
      ;; @dev Signature: setSubnodeOwner(bytes32,bytes32,address)
      ;; @param node The parent node.
      ;; @param label The hash of the label specifying the subnode.
      ;; @param new-owner The address of the new owner.

      (def 'node (calldataload 0x04))
      (def 'label (calldataload 0x24))
      (def 'new-owner (calldataload 0x44))

      (function set-subnode-owner
        (seq (only-node-owner node)

          ;; Transfer ownership by storing passed-in address.
          (set-subowner node label new-owner)

          ;; Emit an event about the transfer.
          ;; NewOwner(bytes32 indexed node, bytes32 indexed label, address owner);
          (mstore call-result new-owner)
          (log3 call-result 32
              (sha3 0x00 (lit 0x00 "NewOwner(bytes32,bytes32,address)"))
              node label)

          ;; Nothing to return.
          (stop)))

      ;; ----------------------------------------------------------------------
      ;; @notice Sets the resolver address for the specified node.
      ;; @dev Signature: setResolver(bytes32,address)
      ;; @param node The node to update.
      ;; @param new-resolver The address of the resolver.

      (def 'node (calldataload 0x04))
      (def 'new-resolver (calldataload 0x24))

      (function set-node-resolver
        (seq (only-node-owner node)

          ;; Transfer ownership by storing passed-in address.
          (set-resolver node new-resolver)

          ;; Emit an event about the change of resolver.
          ;; NewResolver(bytes32 indexed node, address resolver);
          (mstore call-result new-resolver)
          (log2 call-result 32
              (sha3 0x00 (lit 0x00 "NewResolver(bytes32,address)")) node)

          ;; Nothing to return.
          (stop)))

      ;; ----------------------------------------------------------------------
      ;; @notice Sets the TTL for the specified node.
      ;; @dev Signature: setTTL(bytes32,uint64)
      ;; @param node The node to update.
      ;; @param ttl The TTL in seconds.

      (def 'node (calldataload 0x04))
      (def 'new-ttl (calldataload 0x24))

      (function set-node-ttl
        (seq (only-node-owner node)

          ;; Set new TTL by storing passed-in time.
          (set-ttl node new-ttl)

          ;; Emit an event about the change of TTL.
          ;; NewTTL(bytes32 indexed node, uint64 ttl);
          (mstore call-result new-ttl)
          (log2 call-result 32
              (sha3 0x00 (lit 0x00 "NewTTL(bytes32,uint64)")) node)

          ;; Nothing to return.
          (stop)))

      ;; ----------------------------------------------------------------------
      ;; @notice Fallback: No functions matched the function ID provided.

      (jump invalid-location)))

)