#!/usr/bin/env bash
# ─────────────────────────────────────────────────────────────────────────────
# Arcline OS — shared build environment + helpers
#
# Every script under scripts/ sources this first. Values mirror versions.mk;
# when invoked through the Makefile the exported variables take precedence, so
# versions.mk stays the single source of truth.
# ─────────────────────────────────────────────────────────────────────────────
set -euo pipefail

# ── identity ────────────────────────────────────────────────────────────────
: "${DISTRO_NAME:=Arcline OS}"
: "${DISTRO_ID:=arclineos}"
: "${VERSION:=0.1.0}"
: "${RELEASE_NAME:=arclines}"
: "${DEBIAN_SUITE:=bookworm}"
: "${DEBIAN_MIRROR:=http://deb.debian.org/debian}"
: "${SECURITY_MIRROR:=http://security.debian.org/debian-security}"
: "${ARCH:=amd64}"
: "${KERNEL_PACKAGE:=linux-image-amd64}"
: "${KERNEL_VERSION:=6.1}"

# Toolchain policy for image builds:
#   auto    (default) install the Arcline tools if build/debs/*.deb exist,
#           otherwise build without them (with a warning)
#   skip    never install the tools, even if debs are present
#   require fail the build if no toolchain debs are available
: "${ARCLINE_TOOLCHAIN:=auto}"

# ── paths (relative to the repo root) ───────────────────────────────────────
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
: "${BUILD_DIR:=$ROOT/build}"
: "${ROOTFS_DIR:=$BUILD_DIR/rootfs}"
: "${IMAGE_DIR:=$BUILD_DIR/iso}"
: "${DEB_DIR:=$BUILD_DIR/debs}"
: "${LOG_DIR:=$BUILD_DIR/logs}"
: "${ARTIFACT_DIR:=$BUILD_DIR/artifacts}"

# Valid edition names, mirroring versions.mk.
EDITIONS=(server workstation cloud)

# ── output helpers ──────────────────────────────────────────────────────────
log()  { printf '\033[1;34m[arcline]\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m[arcline]\033[0m warning: %s\n' "$*" >&2; }
die()  { printf '\033[1;31m[arcline]\033[0m error: %s\n' "$*" >&2; exit 1; }

# ── path helpers ────────────────────────────────────────────────────────────
edition_dir() { printf '%s/editions/%s' "$ROOT" "$1"; }

validate_edition() {
  local e
  for e in "${EDITIONS[@]}"; do [[ "$e" == "$1" ]] && return 0; done
  die "unknown edition '$1' (expected: ${EDITIONS[*]})"
}

# ── privilege helper ────────────────────────────────────────────────────────
# Builds need root (debootstrap / chroot / mount). If we are not root and sudo
# is present, re-exec under sudo so the rest of the script can assume root.
require_root() {
  if [[ $EUID -eq 0 ]]; then
    return 0
  elif command -v sudo >/dev/null; then
    exec sudo -E "$0" "$@"
  else
    die "build requires root: run with sudo or as root (debootstrap + chroot need it)"
  fi
}