#!/usr/bin/env bash
set -e

envFile=Docker/.env
envExample=Docker/env.example

echo "Checking Docker installation..."
if ! command -v docker >/dev/null 2>&1; then
    echo "Docker not found. Install Docker? [y/N]"
    read -r install_docker
    if [[ "$install_docker" =~ ^[Yy]$ ]]; then
        curl -fsSL https://get.docker.com | sh
    else
        echo "Docker is required. Exiting."
        exit 1
    fi
else
    echo "Docker is already installed."
fi

echo "Checking Docker Compose..."
if ! docker compose version >/dev/null 2>&1; then
    echo "Docker Compose plugin missing. You may need to update Docker."
    exit 1
fi

echo "Preparing .env file..."
if [ ! -f $envFile ]; then
    if [ -f $envExample ]; then
        echo ".env not found. Creating interactively from .env.example."
        > $envFile

        while IFS= read -r line; do

            #ignore empty lines and comments
            [[ "$line" =~ ^#.*$ || -z "$line" ]] && continue


            key=$(printf "%s" "$line" | cut -d '=' -f 1)
            rest=$(printf "%s" "$line" | cut -d '=' -f 2-)

            # extract inline comment portion
            comment=$(printf "%s" "$rest" | sed -n 's/.*# \(.*\)$/\1/p')
            raw_val=$(printf "%s" "$rest" | sed 's/ *#.*//')
            default_value=$(printf "%s" "$raw_val" | sed 's/"//g')

            regex=""
            if [[ "$comment" =~ regex:(.*)$ ]]; then
                regex="${BASH_REMATCH[1]}"
            fi

            comment=$(printf "%s" "$comment" | sed 's/ regex:.*//')

        while true; do
            if [ -z "$comment" ]; then
                printf "Value for $key - $comment (default: $default_value"
            else
                printf "Value for $key (default: $default_value"
            fi
            if [ -n "$regex" ]; then
                printf ", must match: %s" "$regex"
            fi
            printf "):\n"

            read user_input < /dev/tty

            # empty input -> take default
            [ -z "$user_input" ] && user_input="$default_value"

            printf "\e[A$user_input\n"

            # validate
            if [ -n "$regex" ]; then
                if [[ "$user_input" =~ $regex ]]; then
                    echo "$key=$user_input" >> $envFile
                    break
                else
                    printf "Invalid value. Does not match regex: %s\n" "$regex"
                    continue
                fi
            else
                echo "$key=$user_input" >> $envFile
                break
            fi
        done

        done < $envExample

        echo ".env created."
    else
        echo "No .env or .env.example found."
        echo "Creating an empty .env file for manual editing."
        touch $envFile
    fi
else
    echo "Using existing .env. (found at $envFile)"
fi

echo "Start containers with docker compose up -d? [y/N]"
read -r start_containers
if [[ "$start_containers" =~ ^[Yy]$ ]]; then
    cd Docker
    docker compose up -d
    echo "Containers started."
else
    echo "You can start them manually with: docker compose up -d"
fi