#!/bin/bash

# Hook called when commits are pushed to the remote git server
# Parameters:
# $1 - the branch reference
# $2 - the old branch HEAD hash
# $3 - the new branch HEAD hash
#
# If a branch is newly created, $2 will be all zeros.
# If a branch is deleted, $3 will be all zeros.


# set default encoding to UTF-8
export LANG=C.UTF-8
export LC_ALL=C.UTF-8

SCRIPT_DIR=`dirname $(readlink -f "$0")`

# Only run if we are pushing an update on a branch.
# Any other operation (for example pushing tags) will be allowed normally.
[[ "$1" =~ ^refs/heads/ ]] || exit 0

# get hook data
BRANCH_REF=$1
BRANCH_NAME=${1#"refs/heads/"}

# Only run if we are pushing a commit to TDE main branches (master, r14.#.x).
# Commits pushed to other branches (for example for PRs) won't be checked here,
# since gitea actions will take care of checking them prior to allow merging.
[[ "${BRANCH_NAME}" =~ ^master$ ]] || [[ "${BRANCH_NAME}" =~ ^r14\.[0-9]+\.x$ ]] || exit 0

OLD_HASH=$2
NEW_HASH=$3

# Do nothing if branch "r14.#.x" is removed (this should never happen anyway)
[[ "${BRANCH_NAME}" =~ ^r14 ]] && [[ "${NEW_HASH}" =~ ^0+$ ]] && exit 0

# If we are creating the branch "r14.#.x", find the diverge point from master
if [[ "${BRANCH_NAME}" =~ ^r14 ]] && [[ "${OLD_HASH}" =~ ^0+$ ]]; then
  OLD_HASH=`git merge-base master ${NEW_HASH}`
fi

ALL_HASHES=`git rev-list --reverse ${OLD_HASH}..${NEW_HASH}`

echo "-----------------"
echo "Branch name: ${BRANCH_NAME}"
echo "Old hash: ${OLD_HASH}"
echo "New hash: ${NEW_HASH}"
echo "-----------------"

# Check code format version, if present
git cat-file -e ${NEW_HASH}:.repo_settings/code_format.txt 2>/dev/null ||
  { echo "No code format version information file found for repository"; exit 0; }

MOD_CFG_ENTRY=`git show ${NEW_HASH}:.repo_settings/code_format.txt | grep "Version" | grep -v "^\s*#"`
[ -n "${MOD_CFG_ENTRY}" ] || { echo "No code format version information found for repository"; exit 0; }
[ `echo "${MOD_CFG_ENTRY}" | wc -l` = 1 ] ||
  { echo "Multiple versions found in the code format file. Aborting."; exit 1; }

MOD_CFG_VERSION=`echo "${MOD_CFG_ENTRY}" | sed "s|^\s*Version\s\+\([0-9]\+\)\s*$|\1|"`
MOD_CFG_FILE=${SCRIPT_DIR}/../uncrustify_cfg_files/uncrustify_tde_${MOD_CFG_VERSION}.cfg

# Check whether files adhere to the required code format
VALID_EXTENSIONS=".h .cpp .c .h.cmake .cpp.cmake .c.cmake .hpp .hxx .hh .cxx .cc .hpp.cmake"
while read -r COMMIT_HASH; do
  echo "Validating code format for commit: ${COMMIT_HASH}"
  echo "-----------------"
  while read -r FILE_AND_STATUS; do
    if [[ "${FILE_AND_STATUS}" =~ ([ACMR])[[:space:]]+(.*) ]]; then
      FILE_STATUS="${BASH_REMATCH[1]}"
      FILE_NAME="${BASH_REMATCH[2]}"
      # Only check files of the proper type
      for FILE_EXT in $VALID_EXTENSIONS; do
        if [[ "${FILE_NAME}" = *${FILE_EXT} ]]; then
          echo "File: ${FILE_NAME} --- Git status: ${FILE_STATUS}"
          ${SCRIPT_DIR}/../server-side/srv_format_file ${MOD_CFG_FILE} ${COMMIT_HASH} ${FILE_NAME}
          if [ $? -ne 0 ]; then
            echo -e "\n--------------------------------------------------------"
            echo      " Process aborted due to failed code format verification "
            echo -e   "--------------------------------------------------------\n"
            exit 1
          fi
          echo "------"
          break
        fi
      done
    fi
  done < <(git show --pretty="" --name-status ${COMMIT_HASH})
done < <(git rev-list --reverse ${OLD_HASH}..${NEW_HASH})

echo -e "\n----------------------------------------------"
echo      " All files adhere to the required code format "
echo      "----------------------------------------------"