#!/usr/bin/env bash
#=== HELP START ===
# run.sh – local wrapper for the “deb-changelog-action”
#
# Behaviour:
#   • Clones https://git.0xmax42.io/actions/deb-changelog-action at the requested version into a temporary directory.
#   • Installs git-cliff via the action’s helper script.
#   • Generates a Debian-style changelog **in the current working directory** via the action’s generator script.
#
# Usage:
#   ./run.sh --version v0 \
#            --tag v2.9.1 \
#            --package_name mypkg \
#            --author_name  "Max Mustermann" \
#            --author_email max@example.com \
#            [--output_file debian/changelog] \
#            [--cliff_config path/to/cliff.toml]
#
# Options:
#   --version <ver>        Action version to clone (required)
#   --tag <tag>            Git tag used as starting point (required)
#   --package_name <name>  Debian package name (required)
#   --author_name <name>   Changelog author name (required)
#   --author_email <mail>  Changelog author e-mail (required)
#   --output_file <file>   Changelog path (default: debian/changelog)
#   --cliff_config <file>  git-cliff config file (default: configs/cliff.debian.toml)
#   -h, --help             Show this help message
#
# Notes:
#   • Paths given for --output_file are interpreted relative to the directory
#     where you run this script.
#   • If --cliff_config is omitted, the default config shipped with the action
#     (configs/cliff.debian.toml) is used.
#   • PACKAGE_NAME, AUTHOR_NAME, AUTHOR_EMAIL are exported so the TOML template
#     can reference them (e.g. {{ get_env(name="PACKAGE_NAME") }}).
#=== HELP END ===
set -euo pipefail

REPO_URL="https://git.0xmax42.io/actions/deb-changelog-action"

# ───────────────────────────────────────────────
VERSION=""
TAG=""
PACKAGE_NAME=""
AUTHOR_NAME=""
AUTHOR_EMAIL=""
OUTPUT_FILE="debian/changelog"
CLIFF_CONFIG=""
# ───────────────────────────────────────────────

show_help() {
  sed -n '/^#=== HELP START ===/,/^#=== HELP END ===/ {
    /^#=== HELP START ===/d
    /^#=== HELP END ===/d
    s/^#//
    p
  }' "$0"
}

# 1 ─ Parse CLI options ─────────────────────────
while [[ $# -gt 0 ]]; do
  case "$1" in
    --version)       VERSION="$2";       shift 2 ;;
    --tag)           TAG="$2";           shift 2 ;;
    --package_name)  PACKAGE_NAME="$2";  shift 2 ;;
    --author_name)   AUTHOR_NAME="$2";   shift 2 ;;
    --author_email)  AUTHOR_EMAIL="$2";  shift 2 ;;
    --output_file)   OUTPUT_FILE="$2";   shift 2 ;;
    --cliff_config)  CLIFF_CONFIG="$2";  shift 2 ;;
    -h|--help)       show_help; exit 0 ;;
    *) echo "❌ Unknown option: $1"; show_help; exit 1 ;;
  esac
done

# 2 ─ Validate mandatory inputs ────────────────
[[ -z "$VERSION"       ]] && { echo "❌ --version is required";       exit 1; }
[[ -z "$TAG"           ]] && { echo "❌ --tag is required";           exit 1; }
[[ -z "$PACKAGE_NAME"  ]] && { echo "❌ --package_name is required";  exit 1; }
[[ -z "$AUTHOR_NAME"   ]] && { echo "❌ --author_name is required";   exit 1; }
[[ -z "$AUTHOR_EMAIL"  ]] && { echo "❌ --author_email is required";  exit 1; }

# 3 ─ Prepare temporary clone ──────────────────
TMP_DIR=$(mktemp -d)
trap 'rm -rf "$TMP_DIR"' EXIT

echo "📥 Cloning ${REPO_URL}@${VERSION} → $TMP_DIR"
git clone --depth 1 --branch "$VERSION" "$REPO_URL" "$TMP_DIR" >/dev/null

# 4 ─ Install git-cliff via helper script ──────
bash "$TMP_DIR/scripts/install-git-cliff.sh"

# 5 ─ Determine config path ────────────────────
if [[ -z "$CLIFF_CONFIG" ]]; then
  CLIFF_CONFIG="$TMP_DIR/configs/cliff.debian.toml"
fi
[[ ! -r "$CLIFF_CONFIG" ]] && { echo "❌ Config not found: $CLIFF_CONFIG"; exit 1; }

# 6 ─ Generate changelog in CURRENT dir ────────
echo "📝 Generating changelog (output → $OUTPUT_FILE)"
env \
  PACKAGE_NAME="$PACKAGE_NAME" \
  AUTHOR_NAME="$AUTHOR_NAME" \
  AUTHOR_EMAIL="$AUTHOR_EMAIL" \
  bash "$TMP_DIR/scripts/generate-changelog.sh" \
    -c "$CLIFF_CONFIG" \
    -t "$TAG" \
    -o "$OUTPUT_FILE"

echo "✅ Changelog ready: $OUTPUT_FILE"