#!/usr/bin/env bash
set -Eeuo pipefail
cd "$(dirname "${BASH_SOURCE[0]}")"
cd ../

if git grep FIXME | grep -v '^TODOs.org' | grep -v '^scripts/assert-todos.sh'; then
  echo "Found dangling FIXME markers on the project."
  echo "You should write them down properly on TODOs.org."
  exit 1
fi

contains-element() {
  local e match="$1"
  shift
  for e; do [[ "$e" == "$match" ]] && return 0; done
  return 1
}

KNOWN_IDS=()
has_error=0
# shellcheck disable=2013
for todo in $(sed -e '/^\* Tasks$/,/^\* Improvements$/!d' TODOs.org | grep -nE '^\*\* .*$' | cut -d: -f1); do
  if grep -E '^\*\* (CANCELLED|DONE)' <(sed "${todo}q;d" TODOs.org) > /dev/null; then
    ID_OFFSET=3
  else
    ID_OFFSET=2
  fi
  ID="$(sed "$((todo+ID_OFFSET))q;d" TODOs.org)"
  if grep '^:CUSTOM_ID: .*$' <(echo "$ID") > /dev/null; then
    if contains-element "$ID" "${KNOWN_IDS[@]}"; then
      echo "Duplicated ID: $ID"
      has_error=1
    else
      KNOWN_IDS+=("$ID")
    fi
  else
    echo "Missing ID for TODO in line $todo"
    has_error=1
  fi
done

exit "$has_error"