#!/usr/bin/env bash
set -euo pipefail

cLibVersion=0.21.0
os=$(uname)
cLibArgs="$*"

# verify installed Go version
goVersion=$(go version | cut -d' ' -f 3)
goVersionMajor=$(echo "${goVersion}" | cut -d'.' -f1)
goVersionMinor=$(echo "${goVersion}" | cut -d'.' -f2)
goVersionPatch=$(echo "${goVersion}" | cut -d'.' -f3)
if [[ ! "${goVersionMajor}" == "go1" ]]; then
  echo "Unexpected Go major version ${goVersionMajor}, expecting Go 1.11.4+."
  echo "You can proceed and let us know if you think we should extend the support to your version."
elif [[ "${goVersionMinor}" -lt "11" ]]; then
  echo "Invalid Go version ${goVersion}, at least 1.11.4 required."
  exit 1
elif [[ "${goVersionMinor}" == "11" ]] && [[ "${goVersionPatch}" -lt "4" ]]; then
  echo "Invalid Go version ${goVersion}, at least 1.11.4 required."
  exit 1
fi

# sudo might not be defined (e.g. when building a docker image)
sudo="sudo "
if [[ ! -x "$(command -v sudo)" ]]; then
    sudo=""
fi

# check a C/C++ compiler is available - it's used by CGO
if [[ "$os" != MINGW* ]] && [[ "$os" != CYGWIN* ]]; then
  if [[ -z "${CC:-}" ]] && [[ -z "$(command -v gcc)" ]] && [[ -z "$(command -v clang)" ]]; then
    echo "Could not find a C/C++ compiler - \$CC environment variable is empty and neither gcc nor clang commands are recognized."
    echo "The compiler is required for Go CGO, please install gcc or clang, e.g. using your package manager."
    manager=
    installCmd1=
    installCmd2=
    if [[ -x "$(command -v apt)" ]]; then
      manager="APT"
      installCmd1="${sudo}apt update"
      installCmd2="${sudo}apt install gcc"
    elif [[ -x "$(command -v yum)" ]]; then
      manager="Yum"
      installCmd1="${sudo}yum install gcc"
    fi

    installed=
    if [[ -n "${manager}" ]]; then
      echo "Seems like your package manager is ${manager}, you may want to try: ${installCmd1} ; ${installCmd2}"
      read -p "Would you like to execute that command(s) now? [y/N] " -r
      if [[ $REPLY =~ ^[Yy]$ ]]; then
        ${installCmd1}
        ${installCmd2}
        if [[ -n "${CC:-}" ]] || [[ -n "$(command -v gcc)" ]] || [[ -n "$(command -v clang)" ]]; then
          installed=1
        fi
      fi
    fi

    if [[ -z "${installed}" ]]; then
      echo "Please restart this script after installing the compiler manually."
      read -p "If you think this is a false finding and would like to continue with ObjectBox installation regardless, press Y. [y/N] " -r
      if [[ ! $REPLY =~ ^[Yy]$ ]]; then exit; fi
    fi
  fi
fi

# if there's no tty this is probably part of a docker build - therefore we install the c-api explicitly
if [[ "$os" != MINGW* ]] && [[ "$os" != CYGWIN* ]] && [[ "$cLibArgs" != *"--install"* ]]; then
  tty -s || cLibArgs="${cLibArgs} --install"
fi

# install the ObjectBox-C library
mkdir -p objectboxlib && cd objectboxlib
bash <(curl -s https://raw.githubusercontent.com/objectbox/objectbox-c/main/download.sh) ${cLibArgs} ${cLibVersion}
if [[ "$os" == MINGW* ]] || [[ "$os" == CYGWIN* ]]; then
  localLibDir=$(realpath lib)
  echo "Windows must be able to find the objectbox.dll when executing ObjectBox based programs (even tests)."
  echo "One way to accomplish that is to manually copy the objectbox.dll from ${localLibDir} to C:/Windows/System32/ folder."
  echo "See https://golang.objectbox.io/install#objectbox-library-on-windows for more details."
fi
cd -

if [[ -x "$(command -v ldconfig)" ]]; then
  libInfo=$(ldconfig -p | grep "libobjectbox." || true)
  if [ -z "${libInfo}" ]; then
    echo "Installation of the C library failed - ldconfig -p doesn't report libobjectbox. Please try running again."
    exit 1
  fi
fi

# go get flatbuffers (if not using go modules) and objectbox
if [[ ! -f "go.mod" ]]; then
  echo "Your project doesn't seem to be using go modules. Installing FlatBuffers & ObjectBox using go get."
  go get -u github.com/google/flatbuffers/go
  go get -u github.com/objectbox/objectbox-go/objectbox

elif grep -q "module github.com/objectbox/objectbox-go" "go.mod"; then
  echo "Seems like we're running inside the objectbox-go directory itself, skipping ObjectBox Go module installation."

else
  go get -u github.com/objectbox/objectbox-go/objectbox
fi

echo "Installation complete."
echo "You can start using ObjectBox by importing github.com/objectbox/objectbox-go/objectbox in your source code."