#!/usr/bin/env bash

set -e

normalize_file() {
  if [[ "${1}" == *patch ]]; then
    FILE="${1}"
  else
    FILE="${1}.patch"
  fi

  if [[ "${FILE}" == patches/* ]]; then
    FILE="../${FILE}"
  else
    FILE="../patches/${FILE}"
  fi
}

cd vscode || { echo "'vscode' dir not found"; exit 1; }

git add .
git reset -q --hard HEAD

while [[ -n "$( git log -1 | grep "VSCODIUM HELPER" )" ]]; do
  git reset -q --hard HEAD~
done

normalize_file "${1}"

if [[ "${FILE}" != "../patches/helper/settings.patch" ]]; then
  git apply --reject "../patches/helper/settings.patch"

  if [[ $# -gt 1 ]]; then
    while [ $# -gt 1 ]; do
      echo "Parameter: $1"
      normalize_file "${1}"

      git apply --reject "${FILE}"

      shift
    done

    git add .
    git commit --no-verify -q -m "VSCODIUM HELPER"

    normalize_file "${1}"
  else
    normalize_file "${1}"

    BASENAME=$(basename "${FILE}")
    DIRNAME=$(dirname "${FILE}")

    if [[ "${BASENAME}" =~ ^([0-9])([1-9])(-.*)\.patch$ ]]; then
      GROUP_ID="${BASH_REMATCH[1]}"
      INDEX="${BASH_REMATCH[2]}"
      ENDNAME="${BASH_REMATCH[3]}"

      for ((I = 0; I < INDEX; I++)); do
        NOT_FOUND=1

        for CANDIDATE in "${DIRNAME}/${GROUP_ID}${I}-"*.patch; do
          if [[ -f "$CANDIDATE" ]]; then
            echo "Candidate: ${CANDIDATE}"
            normalize_file "${CANDIDATE}"

            git apply --reject "${FILE}"

            NOT_FOUND=0
          fi
        done

        if (( $NOT_FOUND )); then
          for CANDIDATE in "${DIRNAME}/../${GROUP_ID}${I}-"*.patch; do
            if [[ -f "$CANDIDATE" ]]; then
              echo "Candidate: ${CANDIDATE}"
              normalize_file "${CANDIDATE}"

              git apply --reject "${FILE}"
            fi
          done
        fi
      done

      git add .
      git commit --no-verify -q -m "VSCODIUM HELPER"

      normalize_file "${1}"
    fi
  fi
fi

echo "FILE: ${FILE}"

if [[ -f "${FILE}" ]]; then
  if [[ -f "${FILE}.bak" ]]; then
    mv -f $FILE{.bak,}
  fi

  git apply --reject "${FILE}" || true
fi

read -rp "Press any key when the conflict have been resolved..." -n1 -s

while [[ -n "$( find . -name '*.rej' -print )" ]]; do
  echo
  read -rp "Press any key when the conflict have been resolved..." -n1 -s
done

git add .
git diff --staged -U1 > "${FILE}"

if [[ "${FILE}" != "../patches/helper/settings.patch" ]]; then
  git reset -q --hard HEAD
else
  git reset -q --hard HEAD~
fi

echo "The patch has been generated."