#!/usr/bin/env bash

[ -z "$BASH" ] && {
  echo "This script must be run with 'bash' instead of '$0'." >&2
  exit 1
}

[[ ${DEBUG-} == 1 ]] && set -x

set -e -u -o pipefail

YAMLSCRIPT_VERSION=0.2.8
VERSION=${VERSION:-$YAMLSCRIPT_VERSION}
export VERSION

main() (
  setup "$@"

  if [[ ${BIN-} ]]; then
    install ys
  elif [[ ${LIB-} ]]; then
    install libys
  else
    install ys
    install libys
  fi
)

install() (
  name=$1

  url+=/$vers/$name-$vers-$os-$arch.tar.xz

  curl -s -S -L -o "$dir/download.tar.xz" "$url"

  release_dir=$dir/$name
  mkdir -- "$release_dir"
  tar -xf "$dir/download.tar.xz" -C "$release_dir"

  (
    CDPATH='' cd -- "$release_dir" || exit

    make -s --no-print-directory -C "$name"-* install
  )

  if [[ ! ${QUIET-} &&
        $name == ys &&
        $PATH != *"$PREFIX"/bin*
     ]]; then
    echo "
  *** WARNING: '$PREFIX/bin' is not in your PATH yet ***

  You can add it by running:
    export PATH=$PREFIX/bin:\$PATH

  Make it permanent by adding the above line to your shell profile.

  For full details: https://yamlscript.org/doc/install
"
  fi

  if [[ ! ${QUIET-} &&
        $name == libys &&
        $PREFIX != "$HOME/.local" &&
        $PREFIX != /usr/local &&
        ${LD_LIBRARY_PATH-} != *"$PREFIX"/lib*
     ]]; then
    echo
    echo "  *** WARNING: '$PREFIX/lib' is not in your LD_LIBRARY_PATH yet ***"
    echo
  fi
)

setup() {

  vers=${VERSION:-$DEFAULT_VERSION}

  if [[ ! ${PREFIX-} ]]; then
    if [[ $(id -u) == 0 ]]; then
      PREFIX=/usr/local
    else
      PREFIX=$HOME/.local
    fi
  fi
  export PREFIX

  if [[ $OSTYPE == *darwin* ]]; then
    os=macos
  elif [[ $OSTYPE == *linux* ]]; then
    os=linux
  else
    die "Unknown/unsupported OS type: '$OSTYPE'"
  fi

  if [[ $MACHTYPE == *x86_64* ]]; then
    arch=x64
  elif [[ $MACHTYPE == *arm64* || $MACHTYPE == *aarch64* ]]; then
    arch=aarch64
  else
    die "Unknown machine/unsupported type: '$MACHTYPE'"
  fi

  url=https://github.com/yaml/yamlscript/releases/download/

  if [[ ${PREFIX-} && $PREFIX != /* ]]; then
    export PREFIX=$PWD/$PREFIX
  fi

  unset -v dir

  trap '[[ ${dir-} ]] && rm -fr -- "$dir"' EXIT

  dir=$(mktemp -d)
}

die() {
  printf '%s\n' "$@" >&2
  exit 1
}

main "$@"