#!/usr/bin/env bash
# Renders stats-site (Hugo project) without requiring Hugo, deploys atomically
# to /var/www/stats-site/. The Hugo project uses only two template variables;
# we substitute them with sed.
#
# Usage: build.sh [--src DIR] [--dest DIR]
#   --src  default /opt/stats-site
#   --dest default /var/www/stats-site
set -euo pipefail

SRC="${SRC:-/opt/stats-site}"
DEST="${DEST:-/var/www/stats-site}"

# Hugo variables (mirror config.toml).
SITE_TITLE='PSP Speedtest Stats'
SITE_DESC='Метрики латентности и времени отклика двух geo-распределённых OpenSpeedTest нод. Snapshot обновляется каждые 10 минут.'

[ -d "$SRC" ] || { echo "src $SRC not found" >&2; exit 1; }

TMP=$(mktemp -d)
trap "rm -rf $TMP" EXIT

# 1. Copy static/ verbatim
cp -r "$SRC/static/." "$TMP/"

# 2. Render layouts/index.html with sed-substitution
sed \
  -e "s|{{ \.Site\.Title }}|${SITE_TITLE}|g" \
  -e "s|{{ \.Site\.Params\.description }}|${SITE_DESC}|g" \
  "$SRC/layouts/index.html" > "$TMP/index.html"

# 3. Set perms in TMP that nginx (www-data) can read. mktemp creates 700;
#    --archive in rsync preserves them, leading to 403s in nginx logs.
find "$TMP" -type d -exec chmod 0755 {} +
find "$TMP" -type f -exec chmod 0644 {} +

# 4. Atomic rsync, preserving runtime data (snapshot.json) and ownership.
#    --delete removes files in DEST that aren't in TMP (cleans old assets),
#    --exclude protects data/ (snapshot generator owns that).
rsync -a --delete \
  --exclude='data/snapshot.json' \
  --exclude='data/snapshot.json.tmp' \
  --chown=deploy:www-data \
  "$TMP/" "$DEST/"

echo "site built: $(find $DEST -type f | wc -l) files in $DEST"