#!/bin/bash
#
# server-report.sh - denni report stavu serveru na Telegram.
# Obsahuje: uptime, load, RAM, disk, teplota CPU, Docker kontejnery,
# Docker update log, zalohy, sitovy traffic.
#
# Spust jednou rucne: bash server-report.sh
# Spust automaticky: systemd timer server-report.timer (kazdy den 09:30)
#
# Konfigurace: /home/mates/.telegram.conf
#

set -euo pipefail

# === KONFIGURACE ===
USER_NAME="mates"
WORK_DIR="/home/$USER_NAME"
CONFIG_FILE="$WORK_DIR/.telegram.conf"
DOCKER_ROOT="$WORK_DIR/docker"
DOCKER_UPDATE_LOG="$WORK_DIR/skripty/update-docker-script/docker-update.log"
DOCKER_BACKUP_DIR="$WORK_DIR/zalohy/docker"
HOST=$(hostname)
INTERFACE="eth0"  # nastav podle sveho serveru

# Prahy pro upozorneni
DISK_WARN=80
DISK_CRIT=90
TEMP_WARN=70
TEMP_CRIT=80

# === 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:-}"

send_msg() {
    local TEXT="$1"

    if [[ -z "$TELEGRAM_BOT_TOKEN" || -z "$TELEGRAM_CHAT_ID" ]]; then
        echo "Telegram neni nakonfigurovan, preskakuji"
        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 "⚠️ Telegram chyba"
}

# === SYSTEMOVE STATISTIKY ===
UPTIME=$(uptime -p | sed 's/^up //')
LOAD=$(awk '{print $1" "$2" "$3}' /proc/loadavg)
RAM_USED=$(free -h | awk '/^Mem:/ {print $3}')
RAM_TOTAL=$(free -h | awk '/^Mem:/ {print $2}')
DISK_USED_HUMAN=$(df -h / | awk 'NR==2 {print $3}')
DISK_TOTAL_HUMAN=$(df -h / | awk 'NR==2 {print $2}')
DISK_PERCENT_RAW=$(df -P / | awk 'NR==2 {print $5}' | tr -d '%')

# CPU teplota (pokud je k dispozici)
TEMP_RAW=""
if [[ -f /sys/class/thermal/thermal_zone0/temp ]]; then
    TEMP_RAW=$(cat /sys/class/thermal/thermal_zone0/temp 2>/dev/null || echo "")
fi
TEMP_HUMAN=""
if [[ -n "$TEMP_RAW" && "$TEMP_RAW" -gt 0 ]]; then
    TEMP_C=$((TEMP_RAW / 1000))
    TEMP_HUMAN="🌡️ CPU: ${TEMP_C}°C\n"
fi

# Docker kontejnery
CONTAINERS_RUNNING=$(docker ps -q 2>/dev/null | wc -l | tr -d ' ')
CONTAINERS_TOTAL=$(docker ps -aq 2>/dev/null | wc -l | tr -d ' ')
CONTAINERS_STOPPED=$((CONTAINERS_TOTAL - CONTAINERS_RUNNING))

# Sitovy traffic (pokud je dostupny)
NETWORK_RX=$(cat /sys/class/net/$INTERFACE/statistics/rx_bytes 2>/dev/null || echo "0")
NETWORK_TX=$(cat /sys/class/net/$INTERFACE/statistics/tx_bytes 2>/dev/null || echo "0")
NETWORK_RX_HUMAN=$(awk "BEGIN {printf \"%.2f GB\", $NETWORK_RX/1073741824}")
NETWORK_TX_HUMAN=$(awk "BEGIN {printf \"%.2f GB\", $NETWORK_TX/1073741824}")

# Posledni Docker update a zaloha
LAST_UPDATE="zatim neprobehla"
if [[ -f "$DOCKER_UPDATE_LOG" ]]; then
    LAST_UPDATE=$(grep -E "=== (docker-update|update.sh) (spusten|dokoncen)" "$DOCKER_UPDATE_LOG" | tail -1 | awk '{print $1, $2}')
fi

LAST_BACKUP="zatim neprobehla"
if [[ -d "$DOCKER_BACKUP_DIR" ]]; then
    LAST_BACKUP=$(ls -t "$DOCKER_BACKUP_DIR"/*/ 2>/dev/null | head -1 | xargs -I {} basename {} 2>/dev/null || echo "neni")
fi

# === SESTAVENI REPORTU ===
ALERTS=""
if [[ $DISK_PERCENT_RAW -ge $DISK_CRIT ]]; then
    ALERTS="${ALERTS}🚨 *DISK KRITICKY: ${DISK_PERCENT_RAW}%*\n"
elif [[ $DISK_PERCENT_RAW -ge $DISK_WARN ]]; then
    ALERTS="${ALERTS}⚠️ *DISK: ${DISK_PERCENT_RAW}%*\n"
fi

if [[ -n "$TEMP_RAW" && "$TEMP_RAW" -gt 0 ]]; then
    TEMP_C=$((TEMP_RAW / 1000))
    if [[ $TEMP_C -ge $TEMP_CRIT ]]; then
        ALERTS="${ALERTS}🚨 *CPU KRITICKY: ${TEMP_C}°C*\n"
    elif [[ $TEMP_C -ge $TEMP_WARN ]]; then
        ALERTS="${ALERTS}⚠️ *CPU: ${TEMP_C}°C*\n"
    fi
fi

# === ODESLANI ===
REPORT="${ALERTS}📊 *[$HOST]* Denni report

⏱️ Uptime: \`$UPTIME\`
📈 Load: \`$LOAD\`
🧠 RAM: $RAM_USED / $RAM_TOTAL
💾 Disk: $DISK_USED_HUMAN / $DISK_TOTAL_HUMAN (${DISK_PERCENT_RAW}%)
${TEMP_HUMAN}🌐 Sit ($INTERFACE):
  RX: $NETWORK_RX_HUMAN | TX: $NETWORK_TX_HUMAN

🐳 Docker:
  Bezi: $CONTAINERS_RUNNING | Celkem: $CONTAINERS_TOTAL
  Stopped: $CONTAINERS_STOPPED

📅 Posledni Docker update: \`$LAST_UPDATE\`
💾 Posledni zaloha: \`$LAST_BACKUP\`"

send_msg "$REPORT"
exit 0