#!/bin/bash
#
# docker-update.sh - aktualizace Docker Compose projektu na tomto serveru
# (docker compose pull + up -d) + Telegram notifikace.
#
# Spust jednou rucne: bash docker-update.sh
# Spust automaticky: systemd timer docker-update.timer (kazdou sobotu 18:00)
#
# Konfigurace: /home/mates/.telegram.conf
# Log: /home/mates/skripty/update-docker-script/docker-update.log
#

set -euo pipefail

# === KONFIGURACE ===
USER_NAME="mates"
WORK_DIR="/home/$USER_NAME"
ZAKLADNI_SLOZKA="$WORK_DIR/docker"
LOG="$WORK_DIR/skripty/update-docker-script/docker-update.log"
CONFIG_FILE="$WORK_DIR/.telegram.conf"
DATUM=$(date '+%Y-%m-%d %H:%M:%S')
HOST=$(hostname)

# Seznam sluzeb k aktualizaci (uprav podle potreby)
AKTUALIZOVAT=(
 audiobookshelf
 calibre-web
 glance
 homeassistant
 jswiki
 plex
 portainer
 rustdesk
 speedtest
 vaultwarden
 nginx
)

# === 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 "$DATUM ️ Telegram neni nakonfigurovan, preskakuji" >> "$LOG"
 return 0
 fi

 curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
 -d chat_id="${TELEGRAM_CHAT_ID}" \
 -d text="$TEXT" \
 -d parse_mode="Markdown" \
 --max-time 10 \
 --retry 3 > /dev/null || echo "$DATUM ️ Telegram chyba" >> "$LOG"
}

# === HLAVNI LOGIKA ===
echo "$DATUM === docker-update.sh spusten ===" >> "$LOG"
send_msg " *[$HOST]* Spoustim aktualizaci Docker kontejneru..."

# Vytvor log adresar pokud neexistuje
mkdir -p "$(dirname "$LOG")"

AKTUALIZOVANO=()
CHYBY=()

for SLUZBA in "${AKTUALIZOVAT[@]}"; do
 SLUZBA_PATH="$ZAKLADNI_SLOZKA/$SLUZBA"

 if [[ ! -d "$SLUZBA_PATH" ]]; then
 echo "$DATUM SKIP: $SLUZBA (slozka neexistuje)" >> "$LOG"
 continue
 fi

 if [[ ! -f "$SLUZBA_PATH/docker-compose.yml" ]]; then
 echo "$DATUM SKIP: $SLUZBA (docker-compose.yml chybi)" >> "$LOG"
 continue
 fi

 echo "$DATUM === Aktualizuji: $SLUZBA ===" >> "$LOG"

 cd "$SLUZBA_PATH"

 # Stahnout nove image
 if docker compose pull 2>>"$LOG"; then
 # Restart s novym image
 if docker compose up -d 2>>"$LOG"; then
 AKTUALIZOVANO+=("$SLUZBA")
 echo "$DATUM OK: $SLUZBA aktualizovan" >> "$LOG"
 else
 CHYBY+=("$SLUZBA (up)")
 echo "$DATUM CHYBA: $SLUZBA - up -d selhalo" >> "$LOG"
 fi
 else
 CHYBY+=("$SLUZBA (pull)")
 echo "$DATUM CHYBA: $SLUZBA - pull selhalo" >> "$LOG"
 fi
done

# === SOUHRN ===
POCET_OK=${#AKTUALIZOVANO[@]}
POCET_CHYB=${#CHYBY[@]}

if [[ $POCET_CHYB -eq 0 ]]; then
 send_msg " *[$HOST]* Docker aktualizace dokoncena.
Aktualizovano: $POCET_OK sluzeb
Seznam: ${AKTUALIZOVANO[*]}"
else
 send_msg "️ *[$HOST]* Docker aktualizace dokoncena s chybami.
Aktualizovano: $POCET_OK
Chyby: ${CHYBY[*]}"
fi

echo "$DATUM === docker-update.sh dokoncen ===" >> "$LOG"
exit 0