#!/bin/bash
#
# docker-zalohy.sh - zaloha Docker Compose projektu a jejich dat (./data adresaru)
# na NAS (nebo jiny backup disk) + Telegram notifikace.
#
# Spust jednou rucne: bash docker-zalohy.sh
# Spust automaticky: systemd timer docker-zalohy.timer (kazde utery 20:00)
#
# Konfigurace: /home/mates/.telegram.conf
# Log: /home/mates/zalohy/docker/docker.log
#

set -euo pipefail

# === KONFIGURACE ===
USER_NAME="mates"
WORK_DIR="/home/$USER_NAME"
SOURCE_DIR="$WORK_DIR/docker"
BACKUP_DIR="$WORK_DIR/zalohy/docker"
LOG_FILE="$BACKUP_DIR/docker.log"
CONFIG_FILE="$WORK_DIR/.telegram.conf"

# Seznam sluzeb k zalohovani (uprav podle potreby)
APP_DIRS=(
 audiobookshelf
 calibre-web
 flatnotes
 homeassistant
 jswiki
 miniflux
 nginx
 plex
 speedtest
 vaultwarden
 wiki
 glance
)

DATE_DIR=$(date +"%Y%m%d")
TIMESTAMP=$(date +"%H%M%S")
HOST=$(hostname)

# === TELEGRAM KONFIGURACE ===
if [[ -f "$CONFIG_FILE" ]]; then
 # shellcheck disable=SC1090
 source "$CONFIG_FILE"
fi
TELEGRAM_BOT_TOKEN="${TELEGRAM_BOT_TOKEN:-}"
TELEGRAM_CHAT_ID="${TELEGRAM_CHAT_ID:-}"

# === TELEGRAM HELPER ===
send_msg() {
 local TEXT="$1"

 if [[ -z "$TELEGRAM_BOT_TOKEN" || -z "$TELEGRAM_CHAT_ID" ]]; then
 echo "[$(date '+%Y-%m-%d %H:%M:%S')] Telegram neni nakonfigurovan, preskakuji" >> "$LOG_FILE"
 return 0
 fi

 curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
 -d chat_id="${TELEGRAM_CHAT_ID}" \
 -d text="$TEXT" \
 -d parse_mode="Markdown" \
 --max-time 10 \
 --retry 3 > /dev/null || echo "[$(date '+%Y-%m-%d %H:%M:%S')] ️ Telegram chyba" >> "$LOG_FILE"
}

# === HLAVNI LOGIKA ===
mkdir -p "$BACKUP_DIR/$DATE_DIR"

START_TIME=$(date +%s)
ZALOHOVANO=()
CHYBY=()

for APP in "${APP_DIRS[@]}"; do
 APP_PATH="$SOURCE_DIR/$APP"
 if [[ ! -d "$APP_PATH" ]]; then
 continue
 fi

 cd "$APP_PATH"

 # Pokud existuje data/ adresar, zalohuj ho
 if [[ -d "./data" ]]; then
 BACKUP_FILE="$BACKUP_DIR/$DATE_DIR/${APP}-${TIMESTAMP}.tar.zst"

 if tar --zstd -cf "$BACKUP_FILE" -C "$APP_PATH" data 2>>"$LOG_FILE"; then
 ZALOHOVANO+=("$APP ($(du -h "$BACKUP_FILE" | cut -f1))")
 else
 CHYBY+=("$APP")
 fi
 fi
done

END_TIME=$(date +%s)
DURATION=$((END_TIME - START_TIME))

if [[ ${#CHYBY[@]} -eq 0 ]]; then
 send_msg " *[$HOST]* Docker zalohy dokonceny (${DURATION}s).
Zalohovano: ${#ZALOHOVANO[@]} sluzeb
Adresar: \`$BACKUP_DIR/$DATE_DIR\`"
else
 send_msg "️ *[$HOST]* Docker zalohy dokonceny s chybami.
Zalohovano: ${#ZALOHOVANO[@]}
Chyby: ${CHYBY[*]}"
fi

exit 0