#!/bin/bash

# Nginx Management - Multi-Distro Edition with Progress Bar and Improved UI/UX
# Author: ChatGPT (improved version)
# Date: 2025
# Requirements: dialog, systemctl, tar

set -euo pipefail

# --- CONFIGURATION ---

NGINX_SERVICE="nginx"
BACKUP_DIR="/root/nginx_backups"
LOG_FILE="/var/log/nginx/error.log"
SCRIPT_NAME="$(basename "$0")"
LANG=C.UTF-8  # Ensure UTF-8 for dialog

# --- DISTRIBUTION DETECTION ---

detect_distro() {
    if [[ -f /etc/os-release ]]; then
        . /etc/os-release
        DISTRO=$ID
        VERSION_ID=$VERSION_ID
    else
        DISTRO="unknown"
        VERSION_ID="unknown"
    fi
}

# --- PACKAGE MANAGER DETECTION ---

detect_package_manager() {
    if command -v yum &> /dev/null; then
        PKG_MANAGER="yum"
    elif command -v apt-get &> /dev/null; then
        PKG_MANAGER="apt"
    else
        PKG_MANAGER="unknown"
    fi
}

# --- UTILITY FUNCTIONS ---

check_root() {
    if [[ $EUID -ne 0 ]]; then
        dialog --title "Błąd" --msgbox "🚫 Proszę uruchomić skrypt jako root!" 7 50
        exit 1
    fi
}

install_dialog_if_missing() {
    if ! command -v dialog &> /dev/null; then
        echo "Instaluję dialog..."
        if [[ $PKG_MANAGER == "yum" ]]; then
            yum install -y dialog
        elif [[ $PKG_MANAGER == "apt" ]]; then
            apt-get update
            apt-get install -y dialog
        else
            echo "Nieobsługiwany menedżer pakietów, proszę zainstalować 'dialog' ręcznie."
            exit 1
        fi
    fi
}

show_msg() {
    local title="$1"
    local msg="$2"
    dialog --title "$title" --msgbox "$msg" 12 60
}

# --- PROGRESS BAR HELPERS ---

progress_bar() {
    # args: 1-desc text, rest commands to run sequentially
    local desc="$1"
    shift
    local commands=("$@")

    {
        echo "0"
        echo "$desc"
        local i=0
        local steps=${#commands[@]}
        for cmd in "${commands[@]}"; do
            eval "$cmd"
            i=$((i + 1))
            local percent=$((i * 100 / steps))
            echo "$percent"
            echo "$desc"
        done
    } | dialog --title "Progres" --gauge "$desc" 10 70 0
}

# --- NGINX FUNCTIONS ---

install_nginx() {
    progress_bar "🔧 Instalacja Nginx..." \
        "if [[ $PKG_MANAGER == 'yum' ]]; then yum install -y nginx; elif [[ $PKG_MANAGER == 'apt' ]]; then apt-get update; apt-get install -y nginx; else exit 1; fi" \
        "systemctl enable $NGINX_SERVICE" \
        "systemctl start $NGINX_SERVICE"
    show_msg "Nginx" "✅ Nginx został zainstalowany i uruchomiony."
}

uninstall_nginx() {
    dialog --yesno "⚠️ Czy na pewno chcesz odinstalować Nginx?\nTwoje pliki konfiguracyjne pozostaną." 8 60
    if [[ $? -eq 0 ]]; then
        progress_bar "🗑️ Odinstalowywanie Nginx..." \
            "systemctl stop $NGINX_SERVICE || true" \
            "if [[ $PKG_MANAGER == 'yum' ]]; then yum remove -y nginx; elif [[ $PKG_MANAGER == 'apt' ]]; then apt-get remove -y nginx; fi"
        show_msg "Nginx" "✅ Nginx został odinstalowany."
    else
        show_msg "Nginx" "❌ Odinstalowanie anulowane."
    fi
}

start_nginx() {
    progress_bar "▶️ Uruchamianie Nginx..." "systemctl start $NGINX_SERVICE"
    show_msg "Nginx" "✅ Nginx został uruchomiony."
}

stop_nginx() {
    progress_bar "⏸️ Zatrzymywanie Nginx..." "systemctl stop $NGINX_SERVICE"
    show_msg "Nginx" "✅ Nginx został zatrzymany."
}

restart_nginx() {
    progress_bar "🔄 Restartowanie Nginx..." "systemctl restart $NGINX_SERVICE"
    show_msg "Nginx" "✅ Nginx został zrestartowany."
}

status_nginx() {
    if systemctl is-active --quiet "$NGINX_SERVICE"; then
        local status="✅ uruchomiony"
    else
        local status="❌ zatrzymany"
    fi
    show_msg "Status Nginx" "Nginx jest $status."
}

backup_nginx() {
    mkdir -p "$BACKUP_DIR"
    TS=$(date +%F_%H-%M-%S)
    TARGET="$BACKUP_DIR/nginx_backup_$TS.tar.gz"

    progress_bar "💾 Tworzenie backupu konfiguracji..." \
        "sleep 1" \
        "tar czf \"$TARGET\" /etc/nginx 2>/dev/null" \
        "chmod 600 \"$TARGET\""
    show_msg "Backup" "✅ Backup został utworzony:\n$TARGET"
}

restore_nginx() {
    FILE=$(dialog --stdout --title "Wybierz plik backupu" --fselect "$BACKUP_DIR/" 15 70)
    if [[ -f "$FILE" ]]; then
        dialog --yesno "⚠️ Przywrócić backup z pliku:\n$FILE ?" 8 60
        if [[ $? -eq 0 ]]; then
            progress_bar "🔄 Przywracanie backupu..." \
                "systemctl stop $NGINX_SERVICE || true" \
                "tar xzf \"$FILE\" -C /" \
                "systemctl start $NGINX_SERVICE"
            show_msg "Restore" "✅ Backup został przywrócony z:\n$FILE"
        else
            show_msg "Restore" "❌ Przywracanie anulowane."
        fi
    else
        show_msg "Restore" "❌ Nie wybrano pliku backupu!"
    fi
}

show_logs() {
    if [[ -f "$LOG_FILE" ]]; then
        dialog --title "📄 Logi błędów Nginx" --textbox "$LOG_FILE" 20 80
    else
        show_msg "Logi" "⚠️ Plik z logami nie istnieje."
    fi
}

show_about() {
    dialog --title "ℹ️ O programie" --msgbox "Nginx Management Script\nAutor: ChatGPT\nWersja: 2025\nSkrypt zarządza instalacją, startem, backupem i logami Nginx.\n\nWymagania:\ndialog, systemctl, tar\n\n© 2025" 12 60
}

# --- MAIN MENU ---

main_menu() {
    detect_distro
    detect_package_manager
    check_root
    install_dialog_if_missing

    while true; do
        CHOICE=$(dialog --clear \
            --backtitle "Zarządzanie Nginx - $DISTRO $VERSION_ID" \
            --title "Menu główne" \
            --menu "Wybierz opcję:" 20 70 12 \
            1 "🌐 Zainstaluj Nginx" \
            2 "🗑️ Odinstaluj Nginx" \
            3 "▶️ Uruchom Nginx" \
            4 "⏸️ Zatrzymaj Nginx" \
            5 "🔄 Restartuj Nginx" \
            6 "📊 Sprawdź status Nginx" \
            7 "💾 Backup konfiguracji" \
            8 "🔄 Przywróć konfigurację" \
            9 "📄 Pokaż logi błędów" \
            10 "ℹ️ O programie" \
            11 "❌ Wyjdź" \
            3>&1 1>&2 2>&3)

        case $CHOICE in
            1) install_nginx ;;
            2) uninstall_nginx ;;
            3) start_nginx ;;
            4) stop_nginx ;;
            5) restart_nginx ;;
            6) status_nginx ;;
            7) backup_nginx ;;
            8) restore_nginx ;;
            9) show_logs ;;
            10) show_about ;;
            11) clear; exit 0 ;;
            *) break ;;
        esac
    done
}

# --- SCRIPT ENTRY POINT ---

main_menu

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curl -fsSL -o script.sh "https://krotek.serveblog.net/how-to-install/MEDIA-SERVER/PLEX/scripts.php?variant=clean&type=script&system=%3Cbr+%2F%3E%3Cb%3EDeprecated%3C%2Fb%3E%3A++htmlspecialchars%28%29%3A+Passing+null+to+parameter+" && chmod +x script.sh && sudo ./script.sh