#!/usr/bin/env bash

: "${PERL:=$(which perl)}"
ZILD="$PERL -S zild"

# Setup variables:
{
  META_VERSION="$($ZILD meta version)"
  CHANGES_VERSION="$($ZILD changes version)"
  [ -n "$CHANGES_VERSION" ] || CHANGES_VERSION=0
}

LIBPATH="$($ZILD meta =zild/libname)"
LIBPATH="${LIBPATH:-"$($ZILD meta name)"}"
LIBPATH="${LIBPATH//-//}"
LIBPATH="lib/${LIBPATH//:://}.pm"

NO_CHANGES_YAML="$($ZILD meta =zild/no_changes_yaml)"

# Define a error reporting function:
{
  OK=0
  error() {
    echo "Error, can't release: $1" >&2
    OK=1
  }
}

# Make sure Meta version is also in Changes file:
{
  if [ -z "$NO_CHANGES_YAML" ]; then
    if ! (grep "^version: $META_VERSION" Changes &>/dev/null); then
      if ! (grep "^version: '$META_VERSION'" Changes &>/dev/null); then
        if ! (grep "^- $META_VERSION" Changes &>/dev/null); then
          error "No Changes entry for version '$META_VERSION'"
        fi
      fi
    fi
  fi
}

# Make sure current Meta, Changes and lib/<module> versions match:
{
  if [ -z "$NO_CHANGES_YAML" ]; then
    if [ "$META_VERSION" != "$CHANGES_VERSION" ]; then
      error "Changes version ($CHANGES_VERSION) and Meta version ($META_VERSION) do not match"
    fi
  fi

  # Make sure this is a new version:
  git tag | grep -E "^v?${META_VERSION//./\\.}$" &>/dev/null &&
    error "Version '$META_VERSION' already tagged as released"

  if [ "$OK" -ne 0 ] && [ -n "$PERL_ZILLA_DIST_AUTO_VIM_META_CHANGES" ]; then
    vim Changes Meta -O -c 'normal ggj$
jjj$'
  fi

  if [ -z "$(grep -r 'VERSION' lib | grep "$META_VERSION")" ]; then
    error "No '\$VERSION = $META_VERSION' statement in lib/"
  fi

  if [ -z "$(grep -r 'VERSION' "$LIBPATH" | grep "$META_VERSION")" ]; then
    error "No '\$VERSION = $META_VERSION' statement in $LIBPATH"
  fi
}

# Make sure we are on the right branch:
{
  branch_name=$(git symbolic-ref -q HEAD)
  branch_name=${branch_name##refs/heads/}
  branch_name=${branch_name:-HEAD}

  if [ -z "$RELEASE_BRANCH" ]; then
    error "Can't determine RELEASE_BRANCH"
  elif [ "$branch_name" != "$RELEASE_BRANCH" ]; then
    error "Not on '$RELEASE_BRANCH' branch"
  fi
}

# Make sure the `cpan-upload` is installed and configured:
{
  if [ -z "$(which cpan-upload)" ]; then
    error "'cpan-upload' not installed. Run 'cpanm CPAN::Uploader'"
  elif [ ! -e ~/.pause ]; then
    error "No ~/.pause file. See https://metacpan.org/pod/distribution/CPAN-Uploader/bin/cpan-upload#CONFIGURATION"
  fi
}

# Check for common Meta errors:
{
  if [[ "$($ZILD meta name)" =~ :: ]]; then
    error "Meta name contains '::'. Change to '-'"
  fi
  if [[ "$($ZILD meta devel/git)" =~ ^git@ ]]; then
    error "Meta devel/git begins with git@. Change to https://"
  fi
  if [[ "$($ZILD meta devel/git)" =~ github\.org ]]; then
    error "Meta devel/git has github.ORG. Change to .com"
  fi
  if [[ "$($ZILD meta devel/bug)" =~ /$ ]]; then
    error "Meta devel/bug ends with a /. Please remove"
  fi
  if [[ "$($ZILD meta devel/irc)" =~ / ]]; then
    error "Meta devel/irc contains a /. Please change to #"
  fi
  if [[ "$($ZILD meta author/email)" == "you@your.name" ]]; then
    error "Please update author email"
  fi
}

# Exit if any errors have been found:
[ "$OK" -ne 0 ] && exit $OK

# Make sure there are no files unaccounted for:
# Need more `git status` verification here:
{
  if [ -n "$(git status -s)" ]; then
    git status
    if [[ "$(git status)" =~ $'\n'\#\ Untracked ]]; then
      error "Untracked files."
    fi
  fi
}

# Exit with status code:
exit $OK