#!/bin/bash
set -euo pipefail

#------------------------------------------
# Color helpers (no tput)
#------------------------------------------
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
CYAN='\033[0;36m'
PURPLE='\033[0;35m'
BLUE='\033[0;34m'
GRAY='\033[0;37m'
BOLD='\033[1m'
RESET='\033[0m'

# Disable colors if output is not a terminal
if [ ! -t 1 ]; then
    RED='' GREEN='' YELLOW='' CYAN='' PURPLE='' BLUE='' GRAY='' BOLD='' RESET=''
fi

color_yellow() { printf '%b' "$YELLOW"; }
color_cyan()   { printf '%b' "$CYAN"; }
color_red()    { printf '%b' "$RED"; }
color_green()  { printf '%b' "$GREEN"; }
color_reset()  { printf '%b' "$RESET"; }

#------------------------------------------
# Script Version 3.0
#------------------------------------------
echo
color_yellow
echo "----------------------------------------------------------------"
echo "                       script version 3.0"
echo "----------------------------------------------------------------"
color_reset
echo

#------------------------------------------
# OS Detection
#------------------------------------------
echo
color_yellow
echo "----------------------------------------------------------------"
echo                        Start OS Detection"
echo "----------------------------------------------------------------"
color_reset
echo

source /etc/os-release

OS_ID="${ID,,}"
OS_LIKE="${ID_LIKE:-}"
OS_LIKE="${OS_LIKE,,}"
OS_VERSION="${VERSION_ID:-unknown}"
OS_PRETTY="$PRETTY_NAME"
OS=""

case "$OS_ID" in
    arch)   OS="arch" ;;
    debian) OS="debian" ;;
    ubuntu) OS="ubuntu" ;;
    fedora) OS="fedora" ;;
    *)
        if [[ "$OS_LIKE" == *"ubuntu"* ]]; then
            OS="ubuntu"
        elif [[ "$OS_LIKE" == *"arch"* ]]; then
            OS="arch"
        elif [[ "$OS_LIKE" == *"debian"* ]]; then
            OS="debian"
        elif [[ "$OS_LIKE" == *"fedora"* || "$OS_LIKE" == *"rhel"* ]]; then
            OS="fedora"
        fi
        ;;
esac

if [[ -n "$OS" ]]; then
    color_cyan
    echo "----------------------------------------------------------------"
    printf "Detected OS: %s (%s)\n" "$OS" "$OS_PRETTY"
    printf "Version: %s\n" "$OS_VERSION"
    echo "----------------------------------------------------------------"
    color_reset
else
    color_red
    echo "----------------------------------------------------------------"
    printf "ERROR: Unsupported or unknown Linux distribution."
    printf "Detected: ID=$OS_ID, ID_LIKE=${OS_LIKE:-empty}"
    echo "----------------------------------------------------------------"
    color_reset
    exit 1
fi

#------------------------------------------
# Desktop Environment Detection / Selection
#------------------------------------------
echo
color_yellow
echo "----------------------------------------------------------------"
echo "                  Desktop Environment Selection"
echo "----------------------------------------------------------------"
color_reset
echo

DE_RAW="${XDG_CURRENT_DESKTOP:-${DESKTOP_SESSION:-}}"
DE=""

case "${DE_RAW,,}" in
    *xfce*)          DE="xfce" ;;
    *plasma*|*kde*)  DE="plasma" ;;
    *gnome*)         DE="gnome" ;;
    ""|none)         DE="" ;;
esac

if [[ -n "$DE" ]]; then
    echo
    color_cyan
    echo "----------------------------------------------------------------"
    printf "Detected Desktop Environment: $DE (${DE_RAW})"
    echo "----------------------------------------------------------------"
    color_reset
else
    echo
    printf "No Desktop Environment detected. Select one to install:"
    while true; do
        echo "  1) XFCE"
        echo "  2) Plasma"
        echo "  3) GNOME"
        echo "  x) None (default)"
        # Added timeout to avoid hanging
        if ! read -t 15 -rp "Enter choice [1/2/3/x] (default: x): " choice; then
            choice="x"
        fi
        
        case "${choice,,}" in
            1) DE="xfce"; break ;;
            2) DE="plasma"; break ;;
            3) DE="gnome"; break ;;
            x|"") DE="none"; break ;;
            *) echo "Invalid option. Please enter 1, 2, 3, or x." ;;
        esac
    done
    echo
    color_cyan
    echo "----------------------------------------------------------------"
    printf "Selected Desktop Environment: $DE"
    echo "----------------------------------------------------------------"
    color_reset
fi

#------------------------------------------
# Tiling Window Manager Selection
#------------------------------------------
echo
color_yellow
echo "----------------------------------------------------------------"
printf "                      Tiling WM Selection"
echo "----------------------------------------------------------------"
color_reset
echo

while true; do
    echo
    printf "Select a tiling window manager:"
    echo "  1) CHADWM"
    echo "  2) Hyprland"
    echo "  3) Niri"
    echo "  x) None (default)"
    if ! read -t 15 -rp "Enter choice [1/2/3/x] (default: x): " choice; then
        choice="x"
    fi

    case "${choice,,}" in
        1) TWM="chadwm"; break ;;
        2) TWM="hyprland"; break ;;
        3) TWM="niri"; break ;;
        x|"") TWM="none"; break ;;
        *) echo "Invalid option. Please enter 1, 2, 3 or x." ;;
    esac
done

echo
color_cyan
echo "----------------------------------------------------------------"
printf "Selected Tiling WM: $TWM"
echo "----------------------------------------------------------------"
color_reset

#------------------------------------------
# Installation Level Selection
#------------------------------------------
echo
color_yellow
echo "----------------------------------------------------------------"
printf "              Installation Level Selection"
echo "----------------------------------------------------------------"
color_reset
echo

while true; do
    echo
    printf "Select installation level:"
    echo "  1) minimal"
    echo "  2) full"
    echo "  3) workstation"
    echo "  4) server"
    if ! read -t 15 -rp "Enter choice [1/2/3/4] (default: 1): " choice; then
        choice="1"
    fi

    case "$choice" in
        1|"") INSTALL_LEVEL="minimal"; break ;;
        2) INSTALL_LEVEL="full"; break ;;
        3) INSTALL_LEVEL="workstation"; break ;;
        4) INSTALL_LEVEL="server"; break ;;
        *) echo "Invalid option. Please enter 1, 2, 3, or 4." ;;
    esac
done

echo
color_cyan
echo "----------------------------------------------------------------"
printf "Selected Installation Level: $INSTALL_LEVEL"
echo "----------------------------------------------------------------"
color_reset

#------------------------------------------
# Export selections for OS script
#------------------------------------------
export DETECTED_OS="$OS"
export DETECTED_DE="$DE_RAW"
export SELECTED_DE="$DE"
export SELECTED_TWM="$TWM"
export INSTALL_LEVEL

#------------------------------------------
# Determine OS script
#------------------------------------------
case "$OS" in
    debian) OS_SCRIPT="./debian/debian.sh" ;;
    ubuntu) OS_SCRIPT="./ubuntu/ubuntu.sh" ;;
    arch)   OS_SCRIPT="./arch/arch.sh" ;;
    fedora) OS_SCRIPT="./fedora/fedora.sh" ;;
    *)
        color_red
        echo
        echo "No OS script available for $OS"
        color_reset
        exit 1
        ;;
esac

#------------------------------------------
# Preflight check & run
#------------------------------------------
if [[ ! -f "$OS_SCRIPT" ]]; then
    color_red
    echo
    printf "ERROR: OS script not found: $OS_SCRIPT"
    color_reset
    exit 1
fi

if [[ ! -x "$OS_SCRIPT" ]]; then
    chmod +x "$OS_SCRIPT"
fi

echo
color_cyan
printf "Running OS script: $OS_SCRIPT"
color_reset
bash "$OS_SCRIPT" || {
    color_red
    echo
    printf "ERROR: OS script failed: $OS_SCRIPT"
    color_reset
    exit 1
}

echo
color_yellow
echo "----------------------------------------------------------------"
printf "End Detection"
echo "----------------------------------------------------------------"
color_reset