#!/bin/zsh

error() {
    echo "Your package manager is not supported."
    echo "$COMMAND could not be installed automatically."
    echo "Please install $COMMAND manually before running this script."
    exit 1
}

install() {
    COMMAND=$1
    PACKAGE=$2

    if ! command -v $COMMAND &> /dev/null
    then
        if [[ "$OSTYPE" == "linux-gnu"* ]]; then
            echo "$COMMAND not found. Installing $PACKAGE..."

            DISTRO=$(cat /etc/os-release | grep -oP '(?<=^ID=).+' | tr -d '"')

            if [[ $DISTRO == "arch" ]]; then
                sudo pacman -S $PACKAGE
                exit 0
            elif [[ $DISTRO == "archarm" ]]; then
                sudo pacman -S $PACKAGE
                exit 0
            elif [[ $DISTRO == "ubuntu" ]]; then
                sudo apt-get install $PACKAGE
                exit 0
            elif [[ $DISTRO == "fedora" ]]; then
                sudo dnf install $PACKAGE
                exit 0
            elif [[ $DISTRO == "centos" ]]; then
                sudo yum install $PACKAGE
                exit 0
            elif [[ $DISTRO == "debian" ]]; then
                sudo apt install $PACKAGE
                exit 0
            else
                error
            fi

        elif [[ "$OSTYPE" == "darwin"* ]]; then
            echo "$COMMAND not found. Installing $PACKAGE..."

            if command -v "brew" &> /dev/null
            then
                brew install $PACKAGE

            elif command -v "port" &> /dev/null
            then
                sudo port install $PACKAGE

            else
                echo "Homebrew or MacPorts not found. Please install one of them before running this script."
                exit 1
            fi
        else
            error
        fi
    else
        echo "Package $PACKAGE which provides the command $COMMAND, is already installed."
    fi
}

# If the number of arguments is not 2, print the usage
if [[ $# -ne 2 ]]; then
    echo "Usage: check-dependency <command> <package>"
    echo "       check-dependency <--git> <user/repo>"
    echo "Checks if a command is installed and if not, installs the package."
    echo "If --git is specified, it will check if the git repository is executable."
    echo "Supported package managers: apt, pacman, dnf, yum, brew, port"
    exit 1
fi

COMMAND=$1
PACKAGE=$2

# If the command is git, we will clone the repository and install it
if $COMMAND == "--git"; then
    USER=$(echo $PACKAGE | cut -d'/' -f1)
    REPO=$(echo $PACKAGE | cut -d'/' -f2)

    # If the repository is not installed, we will clone it and install it
    if ! command -v $REPO &> /dev/null
    then
        cd /tmp
        git clone https://github.com/$USER/$REPO
        cd $REPO
        inst
        exit 0

    else
        echo "Repository $PACKAGE is already installed."
        exit 0
    fi
else
    install $COMMAND $PACKAGE
fi