# vi: ft=sh
# shellcheck shell=bash

ZVM_DIRENV_VERSION=2.0.0

# Usage: zvm_direnv_version <version_at_least>
#
# Checks that the nix-direnv version is at least as old as <version_at_least>.
zvm_direnv_version() {
  _require_version zvm-direnv $ZVM_DIRENV_VERSION "$1"
}

_require_version() {
  local cmd=$1 version=$2 required=$3
  if ! printf "%s\n" "$required" "$version" | LC_ALL=C sort -c -V 2>/dev/null; then
    log_error \
      "zvm_direnv: minimum required $(basename "$cmd") version is $required (installed: $version)"
    return 1
  fi
}

use_zig() {
  # ZVM_SET_CU will turn off the upgrade check
  if [[ -z $1 ]]; then
    log_error "Must specify a zig version!"
    return 1
  fi
  if [[ "$1" == "master" ]]; then
    log_error "Please don't use master"
    return 1
  fi

  if ! command -v zvm > /dev/null 2>&1; then
    log_error "zvm not installed - please install it from https://www.zvm.app/"
    return 1
  fi
  local state_dir
  if ! ZVM_SET_CU=1 zvm env >/dev/null 2>&1; then
    # zvm env is not available, so we assume all the things are in ZVM_INSTALL
    state_dir="${ZVM_INSTALL}/.."
  else
    state_dir="$(ZVM_SET_CU=1 zvm env |grep -F '"state":' |cut -d: -f2 |cut -d\" -f2)"
  fi
  local version="$1"
  # This is a bad idea, because it will make a global change
  # zvm use $1
  # 
  # Check for existence of the version installed in the state directory
  if [ ! -d "${state_dir}/$version" ]; then
    log_status "zig/zls version $version not installed - downloading with zvm"
    local current
    # zvm 0.7.9 does not indicate which version is in use, so we have to find
    # the version that was hard linked into the bin directory
    # current="$(find "${ZVM_INSTALL}/.." -samefile "${ZVM_INSTALL}/../bin/zig" | \
    #   rev | \
    #   cut -d/ -f2 | \
    #   rev)"
    #
    # We will assume a version of zvm that does allow this
    current="$(ZVM_SET_CU=1 zvm ls --color off |grep -F ' [x]' |cut -d' ' -f1)"
    zvm install --zls "$1" # I think this is safe for all except master

    # zvm install will automatically use the installed version, which is normally
    # cool, but in this case, we don't want to do that, so we will revert
    zvm use "$current"
  fi
  # Don't muck with the path - allow this to be done at the system level
  PATH_add "${state_dir}/$1"
}