## Nim-Codex
## Copyright (c) 2021 Status Research & Development GmbH
## Licensed under either of
##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.

import pkg/upraises

push: {.upraises: [].}

import std/os
import std/terminal
import std/options
import std/strutils
import std/typetraits

import pkg/chronos
import pkg/chronicles
import pkg/chronicles/helpers
import pkg/chronicles/topics_registry
import pkg/confutils/defs
import pkg/confutils/std/net
import pkg/toml_serialization
import pkg/metrics
import pkg/metrics/chronos_httpserver
import pkg/stew/shims/net as stewnet
import pkg/stew/shims/parseutils
import pkg/stew/byteutils
import pkg/libp2p
import pkg/ethers
import pkg/questionable
import pkg/questionable/results

import ./discovery
import ./stores
import ./units
import ./utils

export units
export net, DefaultQuotaBytes, DefaultBlockTtl, DefaultBlockMaintenanceInterval, DefaultNumberOfBlocksToMaintainPerInterval

const
  codex_enable_api_debug_peers* {.booldefine.} = false
  codex_enable_proof_failures* {.booldefine.} = false

type
  StartUpCommand* {.pure.} = enum
    noCommand,
    initNode

  LogKind* = enum
    Auto = "auto"
    Colors = "colors"
    NoColors = "nocolors"
    Json = "json"
    None = "none"

  RepoKind* = enum
    repoFS = "fs"
    repoSQLite = "sqlite"

  CodexConf* = object
    configFile* {.
      desc: "Loads the configuration from a TOML file"
      defaultValueDesc: "none"
      defaultValue: InputFile.none
      name: "config-file" }: Option[InputFile]

    logLevel* {.
      defaultValue: "info"
      desc: "Sets the log level",
      name: "log-level" }: string

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

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

    metricsAddress* {.
      desc: "Listening address of the metrics server"
      defaultValue: ValidIpAddress.init("127.0.0.1")
      defaultValueDesc: "127.0.0.1"
      name: "metrics-address" }: ValidIpAddress

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

    dataDir* {.
      desc: "The directory where codex will store configuration and data."
      defaultValue: defaultDataDir()
      defaultValueDesc: ""
      abbr: "d"
      name: "data-dir" }: OutDir

    case cmd* {.
      command
      defaultValue: noCommand }: StartUpCommand

    of noCommand:

      listenAddrs* {.
        desc: "Multi Addresses to listen on"
        defaultValue: @[
          MultiAddress.init("/ip4/0.0.0.0/tcp/0")
          .expect("Should init multiaddress")]
        defaultValueDesc: "/ip4/0.0.0.0/tcp/0"
        abbr: "i"
        name: "listen-addrs" }: seq[MultiAddress]

      # TODO: change this once we integrate nat support
      nat* {.
        desc: "IP Addresses to announce behind a NAT"
        defaultValue: ValidIpAddress.init("127.0.0.1")
        defaultValueDesc: "127.0.0.1"
        abbr: "a"
        name: "nat" }: ValidIpAddress

      discoveryIp* {.
        desc: "Discovery listen address"
        defaultValue: ValidIpAddress.init(IPv4_any())
        defaultValueDesc: "0.0.0.0"
        abbr: "e"
        name: "disc-ip" }: ValidIpAddress

      discoveryPort* {.
        desc: "Discovery (UDP) port"
        defaultValue: 8090.Port
        defaultValueDesc: "8090"
        abbr: "u"
        name: "disc-port" }: Port

      netPrivKeyFile* {.
        desc: "Source of network (secp256k1) private key file path or name"
        defaultValue: "key"
        name: "net-privkey" }: string

      bootstrapNodes* {.
        desc: "Specifies one or more bootstrap nodes to use when connecting to the network."
        abbr: "b"
        name: "bootstrap-node" }: seq[SignedPeerRecord]

      maxPeers* {.
        desc: "The maximum number of peers to connect to"
        defaultValue: 160
        name: "max-peers" }: int

      agentString* {.
        defaultValue: "Codex"
        desc: "Node agent string which is used as identifier in network"
        name: "agent-string" }: string

      apiBindAddress* {.
        desc: "The REST API bind address"
        defaultValue: "127.0.0.1"
        name: "api-bindaddr"
      }: string

      apiPort* {.
        desc: "The REST Api port",
        defaultValue: 8080.Port
        defaultValueDesc: "8080"
        name: "api-port"
        abbr: "p" }: Port

      repoKind* {.
        desc: "backend for main repo store (fs, sqlite)"
        defaultValueDesc: "fs"
        defaultValue: repoFS
        name: "repo-kind" }: RepoKind

      storageQuota* {.
        desc: "The size of the total storage quota dedicated to the node"
        defaultValue: DefaultQuotaBytes
        defaultValueDesc: $DefaultQuotaBytes
        name: "storage-quota"
        abbr: "q" }: NBytes

      blockTtl* {.
        desc: "Default block timeout in seconds - 0 disables the ttl"
        defaultValue: DefaultBlockTtl
        defaultValueDesc: $DefaultBlockTtl
        name: "block-ttl"
        abbr: "t" }: Duration

      blockMaintenanceInterval* {.
        desc: "Time interval in seconds - determines frequency of block maintenance cycle: how often blocks are checked for expiration and cleanup."
        defaultValue: DefaultBlockMaintenanceInterval
        defaultValueDesc: $DefaultBlockMaintenanceInterval
        name: "block-mi" }: Duration

      blockMaintenanceNumberOfBlocks* {.
        desc: "Number of blocks to check every maintenance cycle."
        defaultValue: DefaultNumberOfBlocksToMaintainPerInterval
        defaultValueDesc: $DefaultNumberOfBlocksToMaintainPerInterval
        name: "block-mn" }: int

      cacheSize* {.
        desc: "The size of the block cache, 0 disables the cache - might help on slow hardrives"
        defaultValue: 0
        defaultValueDesc: "0"
        name: "cache-size"
        abbr: "c" }: NBytes

      persistence* {.
        desc: "Enables persistence mechanism, requires an Ethereum node"
        defaultValue: false
        name: "persistence"
      .}: bool

      ethProvider* {.
        desc: "The URL of the JSON-RPC API of the Ethereum node"
        defaultValue: "ws://localhost:8545"
        name: "eth-provider"
      .}: string

      ethAccount* {.
        desc: "The Ethereum account that is used for storage contracts"
        defaultValue: EthAddress.none
        name: "eth-account"
      .}: Option[EthAddress]

      ethPrivateKey* {.
        desc: "File containing Ethereum private key for storage contracts"
        defaultValue: string.none
        name: "eth-private-key"
      .}: Option[string]

      marketplaceAddress* {.
        desc: "Address of deployed Marketplace contract"
        defaultValue: EthAddress.none
        name: "marketplace-address"
      .}: Option[EthAddress]

      validator* {.
        desc: "Enables validator, requires an Ethereum node"
        defaultValue: false
        name: "validator"
      .}: bool

      validatorMaxSlots* {.
        desc: "Maximum number of slots that the validator monitors"
        defaultValue: 1000
        name: "validator-max-slots"
      .}: int

      simulateProofFailures* {.
          desc: "Simulates proof failures once every N proofs. 0 = disabled."
          defaultValue: 0
          name: "simulate-proof-failures"
          hidden
        .}: int

      logFile* {.
          desc: "Logs to file"
          defaultValue: string.none
          name: "log-file"
          hidden
        .}: Option[string]

    of initNode:
      discard

  EthAddress* = ethers.Address

proc getCodexVersion(): string =
  let tag = strip(staticExec("git tag"))
  if tag.isEmptyOrWhitespace:
    return "untagged build"
  return tag

proc getCodexRevision(): string =
  # using a slice in a static context breaks nimsuggest for some reason
  var res = strip(staticExec("git rev-parse --short HEAD"))
  res.setLen(6)
  return res

proc getNimBanner(): string =
  staticExec("nim --version | grep Version")

const
  codexVersion* = getCodexVersion()
  codexRevision* = getCodexRevision()
  nimBanner* = getNimBanner()

  codexFullVersion* =
    "Codex version:  " & codexVersion & "\p" &
    "Codex revision: " & codexRevision & "\p" &
    nimBanner

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

  getHomeDir() / dataDir

proc parseCmdArg*(T: typedesc[MultiAddress],
                  input: string): MultiAddress
                 {.upraises: [ValueError, LPError].} =
  var ma: MultiAddress
  let res = MultiAddress.init(input)
  if res.isOk:
    ma = res.get()
  else:
    warn "Invalid MultiAddress", input=input, error=res.error()
    quit QuitFailure
  ma

proc parseCmdArg*(T: type SignedPeerRecord, uri: string): T =
  var res: SignedPeerRecord
  try:
    if not res.fromURI(uri):
      warn "Invalid SignedPeerRecord uri", uri=uri
      quit QuitFailure
  except CatchableError as exc:
    warn "Invalid SignedPeerRecord uri", uri=uri, error=exc.msg
    quit QuitFailure
  res

proc parseCmdArg*(T: type EthAddress, address: string): T =
  EthAddress.init($address).get()

proc parseCmdArg*(T: type NBytes, val: string): T =
  var num = 0'i64
  let count = parseSize(val, num, alwaysBin = true)
  if count == 0:
      warn "Invalid number of bytes", nbytes=val
      quit QuitFailure
  NBytes(num)

proc parseCmdArg*(T: type Duration, val: string): T =
  var dur: Duration
  let count = parseDuration(val, dur)
  if count == 0:
      warn "Invalid duration parse", dur=dur
      quit QuitFailure
  dur

proc readValue*(r: var TomlReader, val: var EthAddress)
               {.upraises: [SerializationError, IOError].} =
  val = EthAddress.init(r.readValue(string)).get()

proc readValue*(r: var TomlReader, val: var SignedPeerRecord) =
  without uri =? r.readValue(string).catch, err:
    error "invalid SignedPeerRecord configuration value", error = err.msg
    quit QuitFailure

  val = SignedPeerRecord.parseCmdArg(uri)

proc readValue*(r: var TomlReader, val: var MultiAddress) =
  without input =? r.readValue(string).catch, err:
    error "invalid MultiAddress configuration value", error = err.msg
    quit QuitFailure

  let res = MultiAddress.init(input)
  if res.isOk:
    val = res.get()
  else:
    warn "Invalid MultiAddress", input=input, error=res.error()
    quit QuitFailure

proc readValue*(r: var TomlReader, val: var NBytes)
               {.upraises: [SerializationError, IOError].} =
  var value = 0'i64
  var str = r.readValue(string)
  let count = parseSize(str, value, alwaysBin = true)
  if count == 0:
    error "invalid number of bytes for configuration value", value = str
    quit QuitFailure
  val = NBytes(value)

proc readValue*(r: var TomlReader, val: var Duration)
               {.upraises: [SerializationError, IOError].} =
  var str = r.readValue(string)
  var dur: Duration
  let count = parseDuration(str, dur)
  if count == 0:
    error "Invalid duration parse", value = str
    quit QuitFailure
  val = dur

# no idea why confutils needs this:
proc completeCmdArg*(T: type EthAddress; val: string): seq[string] =
  discard

proc completeCmdArg*(T: type NBytes; val: string): seq[string] =
  discard

proc completeCmdArg*(T: type Duration; val: string): seq[string] =
  discard

# silly chronicles, colors is a compile-time property
proc stripAnsi(v: string): string =
  var
    res = newStringOfCap(v.len)
    i: int

  while i < v.len:
    let c = v[i]
    if c == '\x1b':
      var
        x = i + 1
        found = false

      while x < v.len: # look for [..m
        let c2 = v[x]
        if x == i + 1:
          if c2 != '[':
            break
        else:
          if c2 in {'0'..'9'} + {';'}:
            discard # keep looking
          elif c2 == 'm':
            i = x + 1
            found = true
            break
          else:
            break
        inc x

      if found: # skip adding c
        continue
    res.add c
    inc i

  res

proc updateLogLevel*(logLevel: string) {.upraises: [ValueError].} =
  # Updates log levels (without clearing old ones)
  let directives = logLevel.split(";")
  try:
    setLogLevel(parseEnum[LogLevel](directives[0].toUpperAscii))
  except ValueError:
    raise (ref ValueError)(msg: "Please specify one of: trace, debug, info, notice, warn, error or fatal")

  if directives.len > 1:
    for topicName, settings in parseTopicDirectives(directives[1..^1]):
      if not setTopicState(topicName, settings.state, settings.logLevel):
        warn "Unrecognized logging topic", topic = topicName

proc setupLogging*(conf: CodexConf) =
  when defaultChroniclesStream.outputs.type.arity != 3:
    warn "Logging configuration options not enabled in the current build"
  else:
    var logFile: ?IoHandle
    proc noOutput(logLevel: LogLevel, msg: LogOutputStr) = discard
    proc writeAndFlush(f: File, msg: LogOutputStr) =
      try:
        f.write(msg)
        f.flushFile()
      except IOError as err:
        logLoggingFailure(cstring(msg), err)

    proc stdoutFlush(logLevel: LogLevel, msg: LogOutputStr) =
      writeAndFlush(stdout, msg)

    proc noColorsFlush(logLevel: LogLevel, msg: LogOutputStr) =
      writeAndFlush(stdout, stripAnsi(msg))

    proc fileFlush(logLevel: LogLevel, msg: LogOutputStr) =
      if file =? logFile:
        if error =? file.writeFile(stripAnsi(msg).toBytes).errorOption:
          error "failed to write to log file", errorCode = $error

    defaultChroniclesStream.outputs[2].writer = noOutput
    if logFilePath =? conf.logFile and logFilePath.len > 0:
      let logFileHandle = openFile(
        logFilePath,
        {OpenFlags.Write, OpenFlags.Create, OpenFlags.Truncate}
      )
      if logFileHandle.isErr:
        error "failed to open log file",
          path = logFilePath,
          errorCode = $logFileHandle.error
      else:
        logFile = logFileHandle.option
        defaultChroniclesStream.outputs[2].writer = fileFlush

    defaultChroniclesStream.outputs[1].writer = noOutput

    defaultChroniclesStream.outputs[0].writer =
      case conf.logFormat:
      of LogKind.Auto:
        if isatty(stdout):
          stdoutFlush
        else:
          noColorsFlush
      of LogKind.Colors: stdoutFlush
      of LogKind.NoColors: noColorsFlush
      of LogKind.Json:
        defaultChroniclesStream.outputs[1].writer = stdoutFlush
        noOutput
      of LogKind.None:
        noOutput

  try:
    updateLogLevel(conf.logLevel)
  except ValueError as err:
    try:
      stderr.write "Invalid value for --log-level. " & err.msg & "\n"
    except IOError:
      echo "Invalid value for --log-level. " & err.msg
    quit QuitFailure

proc setupMetrics*(config: CodexConf) =
  if config.metricsEnabled:
    let metricsAddress = config.metricsAddress
    notice "Starting metrics HTTP server",
      url = "http://" & $metricsAddress & ":" & $config.metricsPort & "/metrics"
    try:
      startMetricsHttpServer($metricsAddress, config.metricsPort)
    except CatchableError as exc:
      raiseAssert exc.msg
    except Exception as exc:
      raiseAssert exc.msg # TODO fix metrics