#!/usr/bin/env bash

set -o errexit
set -o nounset

fail() {
  echo "$1" >&2
  exit 1
}

preflight() {
  local cmd=$1
  local msg="%s not found: install it or use the --no-verify flag for the git commit to avoid the running this pre-commit hook.\n"
  command -v $cmd >/dev/null 2>&1 || fail \
    "$(printf "$msg" $cmd)"
}

#
# preflight checks
#
preflight terraform
preflight yq

# terraform fmt -check
tf_files=($(git diff --cached --name-only --diff-filter=ACM -- '*.tf' '*.tfvars'))
if [ ${#tf_files[@]} -gt 0 ]; then
  # terraform fmt -check returns a non-zero exit status and list of files to be
  # formatted: override that exit status so this entire script doesn't exit prematurely
  output=$(printf '%s\n' "${tf_files[@]}" | xargs terraform fmt -check 2>&1 || true)
  if [ -n "$output" ]; then
    printf 'The following files are incorrectly formated: run `terraform fmt` to fix them.\n' >&2
    fail $output
  fi
fi

# yq eval                                                                                                                                                                  
yaml_files=($(git diff --cached --name-only --diff-filter=ACM -- '*.yml' '*.yaml'))
if [ ${#yaml_files[@]} -gt 0 ]; then
  broken_files=()
  for f in ${yaml_files[@]}; do
    yq --exit-status 'tag == "!!map" or tag== "!!seq"' >/dev/null 2>&1 $f || broken_files+=($f)
  done 
  if [ ${#broken_files[@]} -gt 0 ]; then
    echo 'The following files appear to contain invalid yaml:' >&2
    fail "$(printf '%s\n' ${broken_files[@]})"
#    echo 'The following files appear to contain invalid yaml:' >&2
#  	printf '%s\n' ${broken_files[@]} >&2
#	  exit 1
  fi
fi