#!/bin/bash

# theme repository
THEME_REPO=$HOME/repositories/danix2-hugo-theme.git
# repository logical name
REPO="danix.xyz-2"
# Directory where to work on our site
TARGET_DIR=/tmp/danix.xyz-compile
GIT_DIR=$HOME/repositories/${REPO}.git
# Public dir where to push the site once compiled
PUBLIC_WWW="/var/www/html"
BACKUP_WWW=$HOME/danix.xyz-backup
SITE_DOMAIN=https://danix.xyz
# Branch that is going to be deployed to server
BRANCH="master"
# date to be appended to latest tag
NOW=$(date +"%d%m%Y-%H%M")
# Log file
LOG_DIR=/tmp/hugo-danix-site
LOG_FILE=$LOG_DIR/post-receive.log


set -e

# Ensure log directory exists
mkdir -p "$LOG_DIR"

# Tee all output (stdout + stderr) to the log file, appending
exec > >(tee -a "$LOG_FILE") 2>&1

log() {
	echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*"
}

log "========================================"
log "POST-RECEIVE HOOK STARTED"
log "Repo   : $REPO"
log "Branch : $BRANCH"
log "Tag    : release_$NOW"
log "========================================"

# delete the working directory first
log "Removing old working directory: $TARGET_DIR"
rm -rf $TARGET_DIR

# create new temporary site
log "Creating fresh Hugo site at: $TARGET_DIR"
/usr/local/bin/hugo new site $TARGET_DIR

# backup public www directory first then setup trap
log "Backing up $PUBLIC_WWW → $BACKUP_WWW"
rsync -avz --no-t $PUBLIC_WWW/ $BACKUP_WWW
trap "log 'A problem occurred. Reverting to backup.'; rsync -avz --no-t --del $BACKUP_WWW/ $PUBLIC_WWW; rm -rf $TARGET_DIR; log 'Revert complete.'" EXIT

while read oldrev newrev ref
do
	log "Received ref: $ref (${oldrev:0:8} → ${newrev:0:8})"

	# if TARGET_DIR is empty we don't want deploy for this project
	if [[ ! $TARGET_DIR == "" ]]; then
		if [[ "$GL_REPO" == "$REPO" ]]; then
			# let's check that we are deploying to the correct branch
			if [[ $ref = refs/heads/${BRANCH} ]]; then
				log "Deploying '$BRANCH' branch to production..."

				log "Checking out content into $TARGET_DIR"
				git --git-dir=$GIT_DIR --work-tree=. -C "$TARGET_DIR" checkout -f

				log "Cloning theme from $THEME_REPO"
				git clone $THEME_REPO ${TARGET_DIR}/themes/danix-xyz-hacker
				log "Theme cloned at commit: $(git -C ${TARGET_DIR}/themes/danix-xyz-hacker rev-parse --short HEAD)"

				log "Clearing $PUBLIC_WWW"
				rm -rf $PUBLIC_WWW/*

				log "Tagging: release_$NOW"
				git tag release_$NOW $BRANCH

				log "Running Hugo build..."
				/usr/local/bin/hugo -s $TARGET_DIR -d $PUBLIC_WWW -b "${SITE_DOMAIN}" -t "danix-xyz-hacker" --noTimes --minify
				log "Hugo build complete."

				log "========================================"
				log "DEPLOYMENT COMPLETED - ${REPO}"
				log "Target branch : ${BRANCH}"
				log "Target folder : ${PUBLIC_WWW}"
				log "Tag name      : release_${NOW}"
				log "========================================"
			else
				log "Ref $ref received. Doing nothing: only the ${BRANCH} branch may be deployed on this server."
			fi
		else
			log "GL_REPO='$GL_REPO' does not match '$REPO'. Skipping."
		fi
	else
		log "Target directory not declared. Skipping deploy to server."
	fi
done

trap - EXIT
log "Hook finished successfully."