Bash Script to Stream line downloading Stuff

#!/usr/bin/env bash
# by austin staton 2024
# downloadthings script

# Function to install a single dependency using common package managers
install_dependency() {
    local dep="$1"
    echo -e "\e[94m$dep is not installed. Installing...\e[0m"

    if command -v apt &>/dev/null; then
        sudo apt update && sudo apt install -y "$dep"
    elif command -v dnf &>/dev/null; then
        sudo dnf install -y "$dep"
    elif command -v yum &>/dev/null; then
        sudo yum install -y "$dep"
    elif command -v pacman &>/dev/null; then
        sudo pacman -Sy --noconfirm "$dep"
    elif command -v zypper &>/dev/null; then
        sudo zypper install -y "$dep"
    elif command -v brew &>/dev/null; then
        brew install "$dep"
    else
        echo -e "\e[91mPackage manager not recognized. Please install $dep manually.\e[0m"
        exit 1
    fi
}

# Function to check and install dependencies
check_dependencies() {
    echo -e "\e[94mChecking for required dependencies...\e[0m"

    # List all dependencies here
    for dep in yt-dlp wget wkhtmltopdf aria2 httrack; do
        if ! command -v "$dep" &>/dev/null; then
            install_dependency "$dep"
        fi
    done

    echo -e "\e[94mAll dependencies are installed! Getting things ready...\e[0m"
}

# Functions for various tasks
grabvideoBest() {
    yt-dlp --console-title --geo-bypass --no-check-certificates -v \
        -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best' "$1"
}

grabAudioBest() {
    yt-dlp --console-title --geo-bypass --no-check-certificates -v -x \
        --audio-format best --audio-quality 0 "$1"
}

PlaylistgrabvideoBest() {
    yt-dlp --console-title --geo-bypass --no-check-certificates -v \
        -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best' --yes-playlist "$1"
}

PlaylistgrabAudioBest() {
    yt-dlp --console-title --geo-bypass --no-check-certificates -v -x \
        --audio-format best --audio-quality 0 --yes-playlist "$1"
}

grabwebpage() {
    wget -p -r --html-extension --convert-links -E -k -l 1 -np "$1"
}

grabwebpagePlus() {
    local url="$1"
    # Remove trailing slash
    url="${url%/}"

    # Derive a folder name from the URL
    local folderName
    folderName=$(basename "$url")

    # If empty, use fallback
    if [ -z "$folderName" ]; then
        folderName="downloaded_site"
    fi

    wget -p -r --html-extension --convert-links -E -k -l 1 -np \
        -P "./$folderName" "$url" && \
    wkhtmltopdf "$url" "./$folderName/${folderName}.pdf"
}

grabWithAria2() {
    aria2c -x 16 "$1"
}

grabWebsiteHTTrack() {
    httrack "$1" -O ./downloaded_sites
}

# New function for simply downloading an image
grabImageWithWget() {
    local url="$1"
    echo -e "\e[94mDownloading image from URL: $url\e[0m"
    wget -O downloaded_image.jpg "$url"
    echo -e "\e[94mImage downloaded as downloaded_image.jpg\e[0m"
}

# Updated 'explain_options' with color codes and new option #9
explain_options() {
    echo -e "\e[94mExplanation of Options:\e[0m"
    echo -e "\e[94m1. Download a single video: Download the best quality video using yt-dlp.\e[0m"
    echo -e "\e[94m2. Download a single audio file: Extract and download the best audio format using yt-dlp.\e[0m"
    echo -e "\e[94m3. Download a playlist of videos: Download a playlist of videos using yt-dlp.\e[0m"
    echo -e "\e[94m4. Download a playlist of audio files: Extract audio from a playlist using yt-dlp.\e[0m"
    echo -e "\e[94m5. Download a webpage (basic): Save a webpage using wget.\e[0m"
    echo -e "\e[94m6. Download a webpage and convert it to PDF: Use wget and wkhtmltopdf.\e[0m"
    echo -e "\e[94m7. Download using aria2: Download files with high-speed segmentation.\e[0m"
    echo -e "\e[94m8. Mirror a website with HTTrack: Download an entire website for offline browsing.\e[0m"
    echo -e "\e[94m9. Download an image using wget: Retrieve a remote image URL and save it locally.\e[0m"
    echo -e "\e[31m10. Exit: Exit the script.\e[0m"

    echo -e "\n\e[33m---- List of Functions Used in This Script ----\e[0m"
    echo -e "\e[92m- check_dependencies        # Checks and installs dependencies\n\
- grabvideoBest            # Downloads best-quality video using yt-dlp\n\
- grabAudioBest            # Downloads best-quality audio using yt-dlp\n\
- PlaylistgrabvideoBest    # Downloads a playlist of best-quality videos\n\
- PlaylistgrabAudioBest    # Downloads a playlist of best-quality audio\n\
- grabwebpage              # Downloads a webpage using wget\n\
- grabwebpagePlus          # Downloads a webpage + converts it to PDF\n\
- grabWithAria2            # Downloads a file using aria2 with segmentation\n\
- grabWebsiteHTTrack       # Mirrors a website with HTTrack\n\
- grabImageWithWget        # Downloads an image from a URL\n\
- explain_options          # Shows this explanation of options\n\
- main_menu                # Displays the main menu options\e[0m"
}

main_menu() {
    echo -e "\e[32mWelcome to Media Downloader slash Download Things Script lol\e[0m"
    echo -e "\e[33mNOTE: For some downloads, you might need to use a VPN. Ensure your VPN is active if necessary.\e[0m"
    echo -e "\e[94mPlease select an option:\e[0m"
    echo -e "\e[94m1. Download a single video\e[0m"
    echo -e "\e[94m2. Download a single audio file\e[0m"
    echo -e "\e[94m3. Download a playlist of videos\e[0m"
    echo -e "\e[94m4. Download a playlist of audio files\e[0m"
    echo -e "\e[94m5. Download a webpage (basic)\e[0m"
    echo -e "\e[94m6. Download a webpage and convert that webpage to PDF as well\e[0m"
    echo -e "\e[94m7. Download using aria2\e[0m"
    echo -e "\e[94m8. Mirror a website with HTTrack\e[0m"
    echo -e "\e[94m9. Download an image using wget\e[0m"
    echo -e "\e[94m10. Explain each option\e[0m"
    echo -e "\e[31m11. Exit\e[0m"
    read -rp "Enter your choice (1-11): " choice

    case $choice in
        1)
            read -rp "Enter video URL: " url
            grabvideoBest "$url"
            ;;
        2)
            read -rp "Enter audio URL: " url
            grabAudioBest "$url"
            ;;
        3)
            read -rp "Enter playlist URL: " url
            PlaylistgrabvideoBest "$url"
            ;;
        4)
            read -rp "Enter playlist URL: " url
            PlaylistgrabAudioBest "$url"
            ;;
        5)
            read -rp "Enter webpage URL: " url
            grabwebpage "$url"
            ;;
        6)
            read -rp "Enter webpage URL: " url
            grabwebpagePlus "$url"
            ;;
        7)
            read -rp "Enter file URL: " url
            grabWithAria2 "$url"
            ;;
        8)
            read -rp "Enter website URL to mirror: " url
            grabWebsiteHTTrack "$url"
            ;;
        9)
            echo -e "\e[94mEnter image file URL:\e[0m"
            read -rp "" imgURL
            grabImageWithWget "$imgURL"
            ;;
        10)
            explain_options
            ;;
        11)
            echo -e "\e[92mExiting. Goodbye!\e[0m"
            exit 0
            ;;
        *)
            echo -e "\e[91mInvalid choice. Please try again.\e[0m"
            main_menu
            ;;
    esac
}

# Start script
check_dependencies
main_menu