# Fluffy
# Copyright (c) 2021-2024 Status Research & Development GmbH
# Licensed and distributed under either of
#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.

{.push raises: [].}

import
  std/[os, strutils],
  uri,
  confutils,
  confutils/std/net,
  chronicles,
  eth/common/keys,
  eth/p2p/discoveryv5/[enr, node, routing_table],
  nimcrypto/hash,
  stew/byteutils,
  eth/net/nat, # must be late (compilation annoyance)
  ./logging,
  ./network/wire/portal_protocol_config

proc defaultDataDir*(): string =
  let dataDir =
    when defined(windows):
      "AppData" / "Roaming" / "Fluffy"
    elif defined(macosx):
      "Library" / "Application Support" / "Fluffy"
    else:
      ".cache" / "fluffy"

  getHomeDir() / dataDir

const
  defaultListenAddress* = (static parseIpAddress("0.0.0.0"))
  defaultAdminListenAddress* = (static parseIpAddress("127.0.0.1"))

  defaultListenAddressDesc = $defaultListenAddress
  defaultAdminListenAddressDesc = $defaultAdminListenAddress
  defaultDataDirDesc = defaultDataDir()
  defaultStorageCapacity* = 2000'u32 # 2 GB default
  defaultStorageCapacityDesc* = $defaultStorageCapacity

  defaultTableIpLimitDesc* = $defaultPortalProtocolConfig.tableIpLimits.tableIpLimit
  defaultBucketIpLimitDesc* = $defaultPortalProtocolConfig.tableIpLimits.bucketIpLimit
  defaultBitsPerHopDesc* = $defaultPortalProtocolConfig.bitsPerHop
  defaultMaxGossipNodesDesc* = $defaultPortalProtocolConfig.maxGossipNodes
  defaultRpcApis* = @["eth", "portal"]
  defaultRpcApisDesc* = "eth,portal"

type
  RpcFlag* {.pure.} = enum
    eth
    debug
    portal
    portal_debug
    discovery

  TrustedDigest* = MDigest[32 * 8]

  PortalCmd* = enum
    noCommand

  PortalConf* = object
    logLevel* {.
      desc:
        "Sets the log level for process and topics (e.g. \"DEBUG; TRACE:discv5,portal_wire; REQUIRED:none; DISABLED:none\")",
      defaultValue: "INFO",
      name: "log-level"
    .}: string

    logStdout* {.
      hidden,
      desc:
        "Specifies what kind of logs should be written to stdout (auto, colors, nocolors, json)",
      defaultValueDesc: "auto",
      defaultValue: StdoutLogKind.Auto,
      name: "log-format"
    .}: StdoutLogKind

    udpPort* {.defaultValue: 9009, desc: "UDP listening port", name: "udp-port".}:
      uint16

    listenAddress* {.
      defaultValue: defaultListenAddress,
      defaultValueDesc: $defaultListenAddressDesc,
      desc: "Listening address for the Discovery v5 traffic",
      name: "listen-address"
    .}: IpAddress

    network* {.
      desc:
        "Select which Portal network to join. This will set the " &
        "Portal network specific bootstrap nodes automatically",
      defaultValue: PortalNetwork.mainnet,
      name: "network"
    .}: PortalNetwork

    portalSubnetworks* {.
      desc: "Select which networks (Portal sub-protocols) to enable",
      defaultValue: {PortalSubnetwork.history, PortalSubnetwork.state},
      name: "portal-subnetworks"
    .}: set[PortalSubnetwork]

    # Note: This will add bootstrap nodes for both Discovery v5 network and each
    # enabled Portal network. No distinction is made on bootstrap nodes per
    # specific network.
    bootstrapNodes* {.
      desc:
        "ENR URI of node to bootstrap Discovery v5 and the Portal networks from. Argument may be repeated",
      name: "bootstrap-node"
    .}: seq[Record]

    bootstrapNodesFile* {.
      desc:
        "Specifies a line-delimited file of ENR URIs to bootstrap Discovery v5 and Portal networks from",
      defaultValue: "",
      name: "bootstrap-file"
    .}: InputFile

    nat* {.
      desc:
        "Specify method to use for determining public address. " &
        "Must be one of: any, none, upnp, pmp, extip:<IP>",
      defaultValue: NatConfig(hasExtIp: false, nat: NatAny),
      defaultValueDesc: "any",
      name: "nat"
    .}: NatConfig

    enrAutoUpdate* {.
      defaultValue: false,
      desc:
        "Discovery can automatically update its ENR with the IP address " &
        "and UDP port as seen by other nodes it communicates with. " &
        "This option allows to enable/disable this functionality",
      name: "enr-auto-update"
    .}: bool

    dataDir* {.
      desc: "The directory where fluffy will store the content data",
      defaultValue: defaultDataDir(),
      defaultValueDesc: $defaultDataDirDesc,
      name: "data-dir"
    .}: OutDir

    networkKeyFile* {.
      desc: "Source of network (secp256k1) private key file",
      defaultValue: config.dataDir / "netkey",
      name: "netkey-file"
    .}: string

    networkKey* {.
      hidden,
      desc: "Private key (secp256k1) for the p2p network, hex encoded.",
      defaultValue: none(PrivateKey),
      defaultValueDesc: "none",
      name: "netkey-unsafe"
    .}: Option[PrivateKey]

    accumulatorFile* {.
      desc:
        "Get the master accumulator snapshot from a file containing an " &
        "pre-build SSZ encoded master accumulator.",
      defaultValue: none(InputFile),
      defaultValueDesc: "none",
      name: "accumulator-file"
    .}: Option[InputFile]

    metricsEnabled* {.
      defaultValue: false, desc: "Enable the metrics server", name: "metrics"
    .}: bool

    metricsAddress* {.
      defaultValue: defaultAdminListenAddress,
      defaultValueDesc: $defaultAdminListenAddressDesc,
      desc: "Listening address of the metrics server",
      name: "metrics-address"
    .}: IpAddress

    metricsPort* {.
      defaultValue: 8008,
      desc: "Listening HTTP port of the metrics server",
      name: "metrics-port"
    .}: Port

    rpcEnabled* {.
      desc: "Enable the HTTP JSON-RPC server", defaultValue: false, name: "rpc"
    .}: bool

    rpcAddress* {.
      desc: "Listening address of the RPC server",
      defaultValue: defaultAdminListenAddress,
      defaultValueDesc: $defaultAdminListenAddressDesc,
      name: "rpc-address"
    .}: IpAddress

    rpcPort* {.
      desc: "Port for the HTTP JSON-RPC server", defaultValue: 8545, name: "rpc-port"
    .}: Port

    rpcApi* {.
      desc:
        "Enable specific set of RPC APIs (available: eth, debug, portal, portal_debug, discovery)",
      defaultValue: defaultRpcApis,
      defaultValueDesc: $defaultRpcApisDesc,
      name: "rpc-api"
    .}: seq[string]

    wsEnabled* {.
      desc: "Enable the WebSocket JSON-RPC server", defaultValue: false, name: "ws"
    .}: bool

    wsPort* {.
      desc: "Port for the WebSocket JSON-RPC server",
      defaultValue: 8546,
      name: "ws-port"
    .}: Port

    wsCompression* {.
      desc: "Enable compression for the WebSocket JSON-RPC server",
      defaultValue: false,
      name: "ws-compression"
    .}: bool

    tableIpLimit* {.
      hidden,
      desc:
        "Maximum amount of nodes with the same IP in the routing table. " &
        "This option is currently required as many nodes are running from " &
        "the same machines. The option might be removed/adjusted in the future",
      defaultValue: defaultPortalProtocolConfig.tableIpLimits.tableIpLimit,
      defaultValueDesc: $defaultTableIpLimitDesc,
      name: "table-ip-limit"
    .}: uint

    bucketIpLimit* {.
      hidden,
      desc:
        "Maximum amount of nodes with the same IP in the routing table's buckets. " &
        "This option is currently required as many nodes are running from " &
        "the same machines. The option might be removed/adjusted in the future",
      defaultValue: defaultPortalProtocolConfig.tableIpLimits.bucketIpLimit,
      defaultValueDesc: $defaultBucketIpLimitDesc,
      name: "bucket-ip-limit"
    .}: uint

    bitsPerHop* {.
      hidden,
      desc: "Kademlia's b variable, increase for less hops per lookup",
      defaultValue: defaultPortalProtocolConfig.bitsPerHop,
      defaultValueDesc: $defaultBitsPerHopDesc,
      name: "bits-per-hop"
    .}: int

    maxGossipNodes* {.
      hidden,
      desc: "The maximum number of nodes to send content to during gossip",
      defaultValue: defaultPortalProtocolConfig.maxGossipNodes,
      defaultValueDesc: $defaultMaxGossipNodesDesc,
      name: "max-gossip-nodes"
    .}: int

    radiusConfig* {.
      desc:
        "Radius configuration for a fluffy node. Radius can be either `dynamic` " &
        "where the node adjusts the radius based on `storage-size` option, " &
        "or `static:<logRadius>` where the node has a hardcoded logarithmic radius value. " &
        "Warning: `static:<logRadius>` disables `storage-size` limits and " &
        "makes the node store a fraction of the network based on set radius.",
      defaultValue: defaultRadiusConfig,
      defaultValueDesc: $defaultRadiusConfigDesc,
      name: "radius"
    .}: RadiusConfig

    # TODO maybe it is worth defining minimal storage size and throw error if
    # value provided is smaller than minimum
    storageCapacityMB* {.
      desc:
        "Maximum amount (in megabytes) of content which will be stored " &
        "in the local database.",
      defaultValue: defaultStorageCapacity,
      defaultValueDesc: $defaultStorageCapacityDesc,
      name: "storage-capacity"
    .}: uint64

    trustedBlockRoot* {.
      desc:
        "Recent trusted finalized block root to initialize the consensus light client from. " &
        "If not provided by the user, portal light client will be disabled.",
      defaultValue: none(TrustedDigest),
      name: "trusted-block-root"
    .}: Option[TrustedDigest]

    forcePrune* {.
      hidden,
      desc:
        "Force the pruning of the database. This should be used when the " &
        "database is decreased in size, e.g. when a lower static radius " &
        "or a lower storage capacity is set.",
      defaultValue: false,
      name: "force-prune"
    .}: bool

    disablePoke* {.
      hidden,
      desc: "Disable POKE functionality for gossip mechanisms testing",
      defaultValue: defaultDisablePoke,
      defaultValueDesc: $defaultDisablePoke,
      name: "disable-poke"
    .}: bool

    disableStateRootValidation* {.
      hidden,
      desc: "Disables state root validation for content received by the state network.",
      defaultValue: false,
      name: "disable-state-root-validation"
    .}: bool

    case cmd* {.command, defaultValue: noCommand.}: PortalCmd
    of noCommand:
      discard

func parseCmdArg*(T: type TrustedDigest, input: string): T {.raises: [ValueError].} =
  TrustedDigest.fromHex(input)

func completeCmdArg*(T: type TrustedDigest, input: string): seq[string] =
  return @[]

proc parseCmdArg*(T: type enr.Record, p: string): T {.raises: [ValueError].} =
  let res = enr.Record.fromURI(p)
  if res.isErr():
    raise newException(ValueError, "Invalid ENR: " & $res.error)
  res.value

proc completeCmdArg*(T: type enr.Record, val: string): seq[string] =
  return @[]

proc parseCmdArg*(T: type Node, p: string): T {.raises: [ValueError].} =
  let res = enr.Record.fromURI(p)
  if res.isErr():
    raise newException(ValueError, "Invalid ENR: " & $res.error)

  let n = Node.fromRecord(res.value)
  if n.address.isNone():
    raise newException(ValueError, "ENR without address")

  n

proc completeCmdArg*(T: type Node, val: string): seq[string] =
  return @[]

proc parseCmdArg*(T: type PrivateKey, p: string): T {.raises: [ValueError].} =
  try:
    result = PrivateKey.fromHex(p).tryGet()
  except CatchableError:
    raise newException(ValueError, "Invalid private key")

proc completeCmdArg*(T: type PrivateKey, val: string): seq[string] =
  return @[]

proc parseCmdArg*(
    T: type set[PortalSubnetwork], p: string
): T {.raises: [ValueError].} =
  var res: set[PortalSubnetwork] = {}
  let values = p.split({' ', ','})
  for value in values:
    let stripped = value.strip()
    let network =
      try:
        parseEnum[PortalSubnetwork](stripped)
      except ValueError:
        raise newException(ValueError, "Invalid network: " & stripped)

    res.incl(network)
  res

proc completeCmdArg*(T: type set[PortalSubnetwork], val: string): seq[string] =
  return @[]

chronicles.formatIt(InputDir):
  $it
chronicles.formatIt(OutDir):
  $it
chronicles.formatIt(InputFile):
  $it

func processList(v: string, o: var seq[string]) =
  ## Process comma-separated list of strings.
  if len(v) > 0:
    for n in v.split({' ', ','}):
      if len(n) > 0:
        o.add(n)

iterator repeatingList(listOfList: openArray[string]): string =
  for strList in listOfList:
    var list = newSeq[string]()
    processList(strList, list)
    for item in list:
      yield item

proc getRpcFlags*(rpcApis: openArray[string]): set[RpcFlag] =
  if rpcApis.len == 0:
    error "No RPC APIs specified"
    quit QuitFailure

  var rpcFlags: set[RpcFlag]
  for apiStr in rpcApis.repeatingList():
    case apiStr.toLowerAscii()
    of "eth":
      rpcFlags.incl RpcFlag.eth
    of "debug":
      rpcFlags.incl RpcFlag.debug
    of "portal":
      rpcFlags.incl RpcFlag.portal
    of "portal_debug":
      rpcFlags.incl RpcFlag.portal_debug
    of "discovery":
      rpcFlags.incl RpcFlag.discovery
    else:
      error "Unknown RPC API: ", name = apiStr
      quit QuitFailure

  rpcFlags