# beacon_chain
# Copyright (c) 2022-2023 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.

{.used.}

import
  # Standard library
  std/[algorithm, streams],
  # Status libraries
  stew/base10,
  # Third-party
  yaml,
  # Beacon chain internals
  ../../../beacon_chain/spec/helpers,
  # Test utilities
  ../testutil,
  ./fixtures_utils, ./os_ops

type
  TestMeta = object
    updates_count: uint64

proc runTest(path: string, lcDataFork: static LightClientDataFork) =
  test "Light client - Update ranking - " & path.relativePath(SszTestsDir):
    let meta = block:
      var s = openFileStream(path/"meta.yaml")
      defer: close(s)
      var res: TestMeta
      yaml.load(s, res)
      res

    var updates = newSeqOfCap[lcDataFork.LightClientUpdate](meta.updates_count)
    for i in 0 ..< meta.updates_count:
      updates.add parseTest(
        path/"updates_" & Base10.toString(i) & ".ssz_snappy",
        SSZ, lcDataFork.LightClientUpdate)

    proc cmp(a, b: lcDataFork.LightClientUpdate): int =
      if a.is_better_update(b):
        check: not b.is_better_update(a)
        -1
      elif b.is_better_update(a):
        1
      else:
        0
    check: updates.isSorted(cmp)

suite "EF - Light client - Update ranking" & preset():
  const presetPath = SszTestsDir/const_preset
  for kind, path in walkDir(presetPath, relative = true, checkDir = true):
    let testsPath =
      presetPath/path/"light_client"/"update_ranking"/"pyspec_tests"
    if kind != pcDir or not dirExists(testsPath):
      continue
    let fork = forkForPathComponent(path).valueOr:
      test "Light client - Update ranking - " & path:
        skip()
      continue
    for kind, path in walkDir(testsPath, relative = true, checkDir = true):
      withConsensusFork(fork):
        const lcDataFork = lcDataForkAtConsensusFork(consensusFork)
        when lcDataFork > LightClientDataFork.None:
          runTest(testsPath/path, lcDataFork)
        else: raiseAssert "Unreachable"