#!/bin/bash

set -e

# Colors
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m' # No Color

# -----------------------------------------------------------------------------
# Input Framework
# -----------------------------------------------------------------------------

# Ensure we have a tty for input
if [ ! -e /dev/tty ]; then
    echo "Error: Script must be run in an interactive terminal (cannot find /dev/tty)." >&2
    exit 1
fi

# Function to prompt for user input
# Usage: get_input "VARIABLE_NAME" "Prompt Text" "Default Value" "is_secret(true/false)"
get_input() {
    local var_name="$1"
    local prompt_text="$2"
    local default_value="$3"
    local is_secret="$4"

    local input_val=""
    local prompt_full="${GREEN}${prompt_text}${NC}"

    if [ -n "$default_value" ]; then
        prompt_full+=" ${YELLOW}[$default_value]${NC}"
    fi
    prompt_full+=": "

    while true; do
        # Print prompt to stderr so it shows up even if stdout is redirected
        if [ "$is_secret" == "true" ]; then
            echo -ne "$prompt_full" >&2
            read -s input_val < /dev/tty
            echo "" >&2 # Newline after secret input
        else
            echo -ne "$prompt_full" >&2
            read input_val < /dev/tty
        fi

        # Use default if input is empty
        if [ -z "$input_val" ] && [ -n "$default_value" ]; then
            input_val="$default_value"
        fi

        # Validation: Require input if no default exists
        if [ -z "$input_val" ]; then
            echo -e "${RED}Error: This value is required.${NC}" >&2
        else
            break
        fi
    done

    # Set the variable dynamically in the parent scope
    printf -v "$var_name" "%s" "$input_val"
}

# Function to confirm collected inputs
# Usage: confirm_inputs "VAR1" "VAR2" "VAR3" ...
confirm_inputs() {
    echo "" >&2
    echo -e "${GREEN}=== Configuration Summary ===${NC}" >&2
    
    for var in "$@"; do
        local val="${!var}"
        # Mask secrets in summary if needed, or just show length
        # For now, just printing value. 
        # To improve: pass a list of secret vars to mask them.
        echo -e "${YELLOW}$var:${NC} $val" >&2
    done
    echo "" >&2
    
    get_input "CONFIRM" "Is this correct? (y/n)" "y" "false"
    if [[ "${CONFIRM,,}" != "y" ]]; then
        echo -e "${RED}Aborted by user.${NC}" >&2
        exit 1
    fi
}

# -----------------------------------------------------------------------------
# Script Logic
# -----------------------------------------------------------------------------

echo "Starting Interactive Setup..."
echo "-----------------------------"

# 1. Collect Inputs
# Example:
get_input "HOST_NAME" "Enter Hostname" "$(hostname)" "false"
# get_input "ADMIN_PASS" "Enter Admin Password" "" "true"

# 2. Confirm
# confirm_inputs "HOST_NAME" "ADMIN_PASS"

# 3. Execute
# echo "Configuring $HOST_NAME..."