# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)

# Handler for git
# Usage (in package.mk):
# PKG_URL (mandatory) must point to a git repository (git://... or https://example.com/repo.git)
# PKG_VERSION (mandatory) must point to a commit SHA, e.g. a1b2c3d
# PKG_GIT_SHA (optional) full hash of git commit
# PKG_GIT_CLONE_BRANCH (optional) clone specific branch
# PKG_GIT_CLONE_SINGLE (optional) clone single branch only (set to yes)
# PKG_GIT_CLONE_DEPTH (optional) history to clone, must be a number
# PKG_GIT_SUBMODULE_DEPTH (optional) history of submodules to clone, must be a number

_get_repo_already_downloaded() {
  if [ -d $PACKAGE ]; then
    (
      cd $PACKAGE
      _get_repo_clean
      [ -n "$(git ls-remote . | grep -m1 HEAD | awk "/^${PKG_VERSION}/ {print \$1;}")" ] || exit 1
      [ "$PKG_URL" = "$(git remote get-url origin)" ] || exit 1
      [ -z "$PKG_GIT_CLONE_BRANCH" ] && exit 0
      [ "$PKG_GIT_CLONE_BRANCH" = "$(git branch | grep ^\* | cut -d ' ' -f2)" ] || exit 1
      exit 0
    )
    return
  else
    return 1
  fi
}

_get_repo_clean() {
  git clean -fdx
  git checkout -- .
}

# Latest file already present, exit now...
_get_repo_already_downloaded && exit 0

lock_source_dir $1

# Check again in case of concurrent access - if nothing needs to be downloaded, exit now...
_get_repo_already_downloaded && exit 0

# At this point, we need to download something...
printf "%${BUILD_INDENT}c $(print_color CLR_GET "GET")      $1 (git)\n" ' '>&$SILENT_OUT
export BUILD_INDENT=$((${BUILD_INDENT:-1}+$BUILD_INDENT_SIZE))

rm -f $STAMP_URL $STAMP_SHA

GIT_CLONE_PARAMS=""
GIT_SUBMODULE_PARAMS=""

[ -n "$PKG_GIT_CLONE_BRANCH" ] && GIT_CLONE_PARAMS="$GIT_CLONE_PARAMS --branch $PKG_GIT_CLONE_BRANCH"
[ "$PKG_GIT_CLONE_SINGLE" = "yes" ] && GIT_CLONE_PARAMS="$GIT_CLONE_PARAMS --single-branch"

if [ -n "$PKG_GIT_CLONE_DEPTH" ]; then
  if [[ $PKG_GIT_CLONE_DEPTH =~ ^[0-9]+$ ]]; then
    GIT_CLONE_PARAMS="$GIT_CLONE_PARAMS --depth $PKG_GIT_CLONE_DEPTH"
  else
    echo "Fatal: PKG_GIT_CLONE_DEPTH is not a number! ($PKG_GIT_CLONE_DEPTH)"
    exit 1
  fi
fi

if [ -n "$PKG_GIT_SUBMODULE_DEPTH" ]; then
  if [[ $PKG_GIT_SUBMODULE_DEPTH =~ ^[0-9]+$ ]]; then
    GIT_SUBMODULE_PARAMS="$GIT_SUBMODULE_PARAMS --depth $PKG_GIT_SUBMODULE_DEPTH"
  else
    echo "Fatal: PKG_GIT_SUBMODULE_DEPTH is not a number! ($PKG_GIT_SUBMODULE_DEPTH)"
    exit 1
  fi
fi

GIT_FOUND="no"
opwd=$(pwd)
for d in $SOURCES/$1/$1-* ; do
  if [ -d "$d/.git" ]; then
    if [ "${GIT_FOUND}" = "no" ]; then
      cd $d
      if [ "$PKG_URL" = "$(git remote get-url origin)" ]; then
        if [ -n "$PKG_GIT_CLONE_BRANCH" -a $(git branch | grep "^\* ${PKG_GIT_CLONE_BRANCH}$" | wc -l) -eq 1 -o -z "$PKG_GIT_CLONE_BRANCH" ]; then
          GIT_FOUND="yes"
          GIT_DIR="$d"
          _get_repo_clean
        elif [ -n "$PKG_GIT_CLONE_BRANCH" -a $(git branch | grep "^  ${PKG_GIT_CLONE_BRANCH}$" | wc -l) -eq 1 ]; then
          GIT_FOUND="yes"
          GIT_DIR="$d"
          _get_repo_clean
          git checkout $PKG_GIT_CLONE_BRANCH
        elif [ -n "$PKG_GIT_CLONE_BRANCH" -a $(git branch -a | grep "^  remotes/origin/${PKG_GIT_CLONE_BRANCH}$" | wc -l) -eq 1 ]; then
          GIT_FOUND="yes"
          GIT_DIR="$d"
          _get_repo_clean
          git checkout -b $PKG_GIT_CLONE_BRANCH origin/$PKG_GIT_CLONE_BRANCH
        else
          printf "%${BUILD_INDENT}c $(print_color CLR_CLEAN "DELETE") ($d)\n" ' '>&$SILENT_OUT
          cd "${opwd}"
          rm -rf "$d"
        fi
        if [ "$GIT_FOUND" = "yes" ]; then
          printf "%${BUILD_INDENT}c $(print_color CLR_GET "GIT PULL")   $1\n" ' '>&$SILENT_OUT
          git pull
          cd "${opwd}"
        fi
      else
        printf "%${BUILD_INDENT}c $(print_color CLR_CLEAN "DELETE") ($d)\n" ' '>&$SILENT_OUT
        cd "${opwd}"
        rm -rf "$d"
      fi
    else
      printf "%${BUILD_INDENT}c $(print_color CLR_CLEAN "DELETE") ($d)\n" ' '>&$SILENT_OUT
      rm -rf "$d"
    fi
  fi
done
cd "${opwd}"

if [ "${GIT_FOUND}" = "no" ]; then
  printf "%${BUILD_INDENT}c $(print_color CLR_GET "GIT CLONE")   $1\n" ' '>&$SILENT_OUT
  git clone $GIT_CLONE_PARAMS $PKG_URL $PACKAGE
else
  if [ ! "${GIT_DIR}" = "${PACKAGE}" ]; then
    mv "${GIT_DIR}" "${PACKAGE}"
  fi
fi

(
  cd $PACKAGE
  [ $(git log --oneline --pretty=tformat:"%H" | grep "^$PKG_VERSION" | wc -l) -eq 1 ] || { echo "There is no commit '$PKG_VERSION' on branch '$(git branch | grep ^\* | cut -d ' ' -f2)' of package '$1'! Aborting!" ; exit 1 ; }
  git reset --hard $PKG_VERSION
  printf "%${BUILD_INDENT}c $(print_color CLR_GET "GIT SUBMODULE")   $1\n" ' '>&$SILENT_OUT
  git submodule update --init --recursive $GIT_SUBMODULE_PARAMS
)

GIT_SHA=$(git ls-remote $PACKAGE | grep -m1 HEAD | awk '{print $1;}')

if [ -n "$PKG_GIT_SHA" ]; then
   [ "$PKG_GIT_SHA" = "$GIT_SHA" ] || printf "%${BUILD_INDENT}c $(print_color CLR_WARNING "WARNING") Incorrect git hash in respository: got ${GIT_SHA}, wanted ${PKG_GIT_SHA}\n\n" ' '>&$SILENT_OUT
fi