#!/bin/bash

# LXS - Common library
# Sourced by lxs.sh and all sub-scripts. Provides colors, UI helpers, loggers,
# spinner, OS guards, and shared utilities (public IP, password generation,
# apt lock wait, root re-exec, apt non-interactive setup).
# Repo: https://git.hyko.cx/hykocx/lxs

# ═══════════════════════════════════════════════════════════════════════════
# Colors — Cyberpunk 2077 neon palette
# ═══════════════════════════════════════════════════════════════════════════

RED='\033[1;91m'      # ICE alert
GREEN='\033[1;92m'    # phosphor green
YELLOW='\033[1;93m'   # signature electric yellow
MAGENTA='\033[1;95m'  # hot pink neon
CYAN='\033[1;96m'     # neon cyan
WHITE='\033[1;97m'    # bold white
GRAY='\033[0;90m'     # dark gray
PURPLE='\033[1;95m'   # alias on MAGENTA for legacy sub-scripts
NC='\033[0m'
BOLD='\033[1m'
DIM='\033[2m'
BLINK='\033[5m'
REV='\033[7m'

# ═══════════════════════════════════════════════════════════════════════════
# UI helpers
# ═══════════════════════════════════════════════════════════════════════════

show_separator() {
    local cols
    cols=$(tput cols 2>/dev/null || echo 64)
    printf "${YELLOW}"
    printf '▀%.0s' $(seq 1 "$cols")
    printf "${NC}\n"
}

show_title() {
    local title="$1"
    local subtitle="${2:-SYS_MODULE}"
    echo ""
    echo -e "${YELLOW}${REV} ${title} ${NC}  ${MAGENTA}// ${subtitle}${NC}"
    show_separator
}

info()  { echo -e "${MAGENTA}[··]${NC} $*"; }
ok()    { echo -e "${GREEN}[OK]${NC} $*"; }
warn()  { echo -e "${YELLOW}[!!]${NC} $*"; }
err()   { echo -e "${RED}[KO]${NC} $*" >&2; }

# ═══════════════════════════════════════════════════════════════════════════
# Spinner — runs a shell command, redirects output to a log file, shows
# a spinner with a label, prints ✓/✗ on completion. Returns the command's
# exit code.
#
# Usage:
#   run_spinner "Installing foo..." "apt-get install -y foo"
#
# Log file: ${LXS_LOG_FILE:-/tmp/lxs.log}
# ═══════════════════════════════════════════════════════════════════════════

run_spinner() {
    local message=$1
    shift
    local command="$*"
    local spinstr='|/-\'
    local log="${LXS_LOG_FILE:-/tmp/lxs.log}"

    echo -e "${MAGENTA}[··] ${message}${NC}"
    eval "$command" > "$log" 2>&1 &
    local pid=$!

    while kill -0 "$pid" 2>/dev/null; do
        local temp=${spinstr#?}
        printf "\r${MAGENTA}[%c·]${NC} ${message}" "$spinstr"
        spinstr=$temp${spinstr%"$temp"}
        sleep 0.15
    done

    wait "$pid"
    local exit_code=$?
    if [ $exit_code -eq 0 ]; then
        printf "\r${GREEN}[OK]${NC} ${message}\n"
    else
        printf "\r${RED}[KO]${NC} ${message}\n"
    fi
    return $exit_code
}

# ═══════════════════════════════════════════════════════════════════════════
# Guards
# ═══════════════════════════════════════════════════════════════════════════

require_debian_ubuntu() {
    if ! grep -qiE 'debian|ubuntu' /etc/os-release 2>/dev/null; then
        err "This script supports Debian/Ubuntu only."
        return 1
    fi
}

# Re-exec the current script via sudo if not already root. Preserves env and
# arguments. Call near the top of a sub-script:
#   require_root "$0" "$@"
require_root() {
    [ "$EUID" -eq 0 ] && return 0
    local self=$1
    shift
    exec sudo -E "$self" "$@"
}

# ═══════════════════════════════════════════════════════════════════════════
# Network / random / apt helpers
# ═══════════════════════════════════════════════════════════════════════════

get_public_ip() {
    local ip=""
    ip=$(curl -s --max-time 5 ifconfig.me 2>/dev/null) || \
    ip=$(curl -s --max-time 5 icanhazip.com 2>/dev/null) || \
    ip=$(curl -s --max-time 5 ipinfo.io/ip 2>/dev/null) || \
    ip=$(hostname -I 2>/dev/null | awk '{print $1}')
    echo "$ip"
}

# Generate a random alphanumeric string. Default length: 32.
generate_password() {
    local length=${1:-32}
    LC_ALL=C tr -dc 'a-zA-Z0-9' </dev/urandom | head -c "$length"
}

# Configure apt/debconf for fully non-interactive runs. Safe to call multiple
# times. No-op when apt is absent.
apt_noninteractive() {
    command -v apt >/dev/null 2>&1 || return 0
    export DEBIAN_FRONTEND=noninteractive
    export NEEDRESTART_MODE=a
    export NEEDRESTART_SUSPEND=1
    echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections 2>/dev/null || true
}

# Add a UFW allow rule, but only if UFW is installed AND active. No-op
# otherwise — so app installers can declare the ports they need without
# forcing UFW on hosts that don't use it.
#
# Usage:
#   ufw_allow 8000/tcp "Coolify dashboard"
#   ufw_allow 80/tcp
ufw_allow() {
    command -v ufw >/dev/null 2>&1 || return 0
    ufw status 2>/dev/null | grep -q "Status: active" || return 0
    local rule=$1 comment=${2:-}
    if [ -n "$comment" ]; then
        ufw allow "$rule" comment "$comment" >/dev/null
    else
        ufw allow "$rule" >/dev/null
    fi
    ok "UFW :: allowed ${rule}${comment:+ (${comment})}"
}

# Wait for other apt/dpkg processes to release their locks. Up to 120s.
wait_for_apt() {
    command -v apt >/dev/null 2>&1 || return 0

    local max_wait=120
    local wait_count=0
    local lock_detected=false

    while fuser /var/lib/dpkg/lock-frontend >/dev/null 2>&1 || \
          fuser /var/lib/dpkg/lock >/dev/null 2>&1 || \
          fuser /var/lib/apt/lists/lock >/dev/null 2>&1; do

        [ "$lock_detected" = false ] && lock_detected=true && \
            echo -e "${YELLOW}[!!] Waiting for other package manager to finish...${NC}"

        wait_count=$((wait_count + 1))
        [ $wait_count -ge $max_wait ] && \
            echo -e "${RED}[KO] Timeout waiting for package manager${NC}" && return 1

        printf "\r${GRAY}[··] Waiting... (%ds/%ds)${NC}" $wait_count $max_wait
        sleep 1
    done

    [ "$lock_detected" = true ] && \
        echo -e "\n${GREEN}[OK] Package manager is now available${NC}"
    return 0
}