#!/usr/bin/env bash

########## Competition Block ##########

# tc = test compete
_tc_tmp="${test_dir:-"/tmp"}/tmp_compete"

# Each competition link is given to both tools
# and the output is compared
#
# Array format:
# [0] = Title
# [1] = path for competition
# [2] = path for competition
# ...

# Compete test suites (arrays) 
compete_canonicalize=( "Canonicalize invalid path"
  "-v" # Not recommended file naming
  "///tmp//./b"
  #"//tmp//./b/.." # TODO return empty
  #"//tmp//./b/." # TODO return empty
)
  
compete_all=( "Test - everything starting from /"
  /**/*
)


tocompete_init() {
  # initialize custom test structure
  {
    tocompete_clean
    mkdir -p "${_tc_tmp}"
    # compete_links
    touch "${_tc_tmp}/a"
    ln -s "${_tc_tmp}/a" "${_tc_tmp}/a 2"
    ln -s "${_tc_tmp}/a 2" "${_tc_tmp}/a 3"
    
    # compete_no_permission
    mkdir -p "${_tc_tmp}/noperm"
    chmod 400 "${_tc_tmp}/noperm"
    ln -s "noperm" "${_tc_tmp}/noperml"
    ln -s "/" "${_tc_tmp}/lroot"
    ln -s "/root" "${_tc_tmp}/lroothome"
    
    #echo "rl: " && readlink "${_tc_tmp}/lnoperm"  
    #ls -l "${_tc_tmp}"
  }

  # Base directory for the test
  cd "${_tc_tmp}"

  # Compete test arrays with "dynamic" cases need to be inside the init function
  # e.g. "$(cd ../test && pwd)/file" - base directory must be set first
  # e.g. "${_tc_tmp}/"* - _tc_tmp must be populated first
  compete_invalid=( "Invalid files with and without valid path"
    "${_tc_tmp}/invalid_file"
    "/invalid_file"
    "/invalid_direcotry/invalidfile"
  )

  compete_links=( "Test - Valid links"
    "${_tc_tmp}/a 3" # slink chain a3 -> a2 -> a
    "${_tc_tmp}/a"*
    "/dev/stdin"
    "/bin/adb"
    "/dev/fd" # Test skip - /dev/fd is different on every call
    "/dev/stdout" # skip - different output
    "/etc/mtab" # skip - Always different
    "/proc/mounts" # skip - Always different
    "/proc/net/"* # skip - Always different
  )

  compete_no_permission=( "No permission to enter directory (direct and link)"
    "/proc/"**/cwd # special - no permission for links 
    "noperm"*
    "lroot"*
    "/"
  )

  # Add tests to global test array from test_rdlink
  tocompete+=(
    compete_invalid
    compete_links
    compete_no_permission
    compete_canonicalize
    compete_all
  )
}

tocompete_clean() {
  rm -rf "${_tc_tmp}" 
}

########## Assertion Block ##########

# ta = test assert
_ta_tmp="${test_dir:-"/tmp"}/tmp_assert"

# Assertion string compare test arrays
#
# Array format
# [0] = Title
# [1] input == [2] expected
# [3] input == [4] expected
# ...

toassert_init() {
  {
    mkdir -p "${_ta_tmp}"
  }

  # Base directory for the test
  cd "${_ta_tmp}"

  # Assert test arrays with "dynamic" cases need to be inside the init function
  # e.g. "$(cd ../test && pwd)/file" - base directory must be set first
  # e.g. "${_tc_tmp}/"* - _tc_tmp must be populated first
  assert_invalid_files=( "Assert - invalid files"
    "${_ta_tmp}/missing_file" "${_ta_tmp}/missing_file"
    "${_ta_tmp}/missd/missf" ""
    "${_ta_tmp}/miss c" "${_ta_tmp}/miss c"
    "rel_a" "${_ta_tmp}/rel_a"
    "../rel_b" "$(cd ".." && pwd)/rel_b"
  )

  # Add test arrays to global test array from test_rdlink
  toassert+=(
    assert_invalid_files
  )
}

toassert_clean() {
  rm -rf "${_ta_tmp}"
}

########## Common data and functions ##########
#
# [0] exclude regex [1] Reason for exclution
# [2] exclude regex [3] Reason for exclution
exclude_path=(
  "/dev/fd$" "Different on every call"
  "/dev/stdout$" "Always different in pipes"
  "/etc/mtab$" "Different on every call"
  "/proc/mounts$" "Different on every call"
  "/proc/net$" "Different on every call"
  "/proc/net/.*" "Different on every call"
  "/proc/self/fd/(1|3|255)" "Different on every call"
  "/proc/self$" "Different on every call"
  "/proc/self/(attr|fdinfo|map_files|net|ns|task)/.*" "Different on every call"
  "/proc/thread-self$" "Different on every call"
)

toexclude() {
  local path=
  local exclude=
  for path in "${exclude_path[@]}" ; do
    if [[ ! "${exclude}" ]] ; then
      exclude="${path}"
    else 
      # return reason for exclution
      if [[ "${1:-}" =~ ${exclude} ]] ; then
        printf "${path}"
        return 0
      fi
      exclude=
    fi
  done
  return 1
}

########## Clean custom test data ##########
#
totest_cleanall() {
  tocompete_clean
  toassert_clean
}
trap totest_cleanall EXIT