#!/bin/bash
# ============================================================================
# DarkForge Linux — Phase 0: Full Bootstrap
# ============================================================================
# Purpose:  Single entry point that runs the entire Phase 0 bootstrap:
#           1. Tear down & create fresh loopback filesystem
#           2. Set up directory structure, lfs user, env files
#           3. Download source tarballs
#           4. Copy toolchain scripts to $LFS so lfs user can access them
#           5. Launch build-all.sh as the lfs user
#
# Usage:    sudo -E bash toolchain/bootstrap.sh
#           (run from the project root, e.g. /home/danny/darkforge)
#
# Inputs:   LFS (default: /mnt/darkforge)
# Outputs:  A complete cross-toolchain and temporary tools on $LFS
# Assumes:  Running as root on Arch Linux, internet access
# ============================================================================

set -euo pipefail

# --- Configuration -----------------------------------------------------------
export LFS="${LFS:-/mnt/darkforge}"

# Detect the project root (parent of toolchain/)
BOOTSTRAP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(dirname "${BOOTSTRAP_DIR}")"
SCRIPT_SRC="${BOOTSTRAP_DIR}/scripts"

# Color output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
NC='\033[0m'

ok()   { echo -e "${GREEN}>>> $*${NC}"; }
warn() { echo -e "${YELLOW}>>> $*${NC}"; }
info() { echo -e "${CYAN}>>> $*${NC}"; }
fail() { echo -e "${RED}>>> $*${NC}"; exit 1; }

# --- Verify running as root --------------------------------------------------
[ "$(id -u)" -eq 0 ] || fail "This script must be run as root (use sudo -E)."

echo "============================================================"
echo " DarkForge Linux — Phase 0 Full Bootstrap"
echo "============================================================"
echo ""
echo "  Project root: ${PROJECT_ROOT}"
echo "  LFS mount:    ${LFS}"
echo ""

# =============================================================================
# Step 1: Create fresh loopback filesystem
# =============================================================================
info "STEP 1/5: Setting up build filesystem..."
bash "${SCRIPT_SRC}/000-setup-disk.sh"
echo ""

# =============================================================================
# Step 2: Set up directory structure, lfs user, and env
# =============================================================================
info "STEP 2/5: Setting up environment..."
bash "${SCRIPT_SRC}/000-env-setup.sh"
echo ""

# =============================================================================
# Step 3: Download all source tarballs
# =============================================================================
info "STEP 3/5: Downloading source tarballs..."
bash "${SCRIPT_SRC}/000a-download-sources.sh"
echo ""

# =============================================================================
# Step 4: Copy toolchain scripts to $LFS/sources/toolchain-scripts/
# =============================================================================
info "STEP 4/5: Copying toolchain scripts to ${LFS}/sources/toolchain-scripts/..."
SCRIPTS_DEST="${LFS}/sources/toolchain-scripts"
rm -rf "${SCRIPTS_DEST}"
mkdir -p "${SCRIPTS_DEST}"
cp -v "${SCRIPT_SRC}/"*.sh "${SCRIPTS_DEST}/"
chmod +x "${SCRIPTS_DEST}/"*.sh
chown -R lfs:lfs "${SCRIPTS_DEST}"
ok "Scripts copied and owned by lfs user"
echo ""

# =============================================================================
# Step 5: Run build-all.sh as lfs user
# =============================================================================
info "STEP 5/5: Building cross-toolchain as lfs user..."
echo "  This will take a while (30-60+ minutes on 32 threads)."
echo "  Logs will be in: ${LFS}/sources/logs/"
echo ""

# Run build-all.sh as the lfs user with a clean environment.
# We use 'su' without -l to avoid the lfs .bash_profile which does
# 'exec env -i /bin/bash' and would swallow our -c command.
# Instead, we build the clean environment ourselves.
env -i HOME=/home/lfs TERM="${TERM}" \
    LFS="${LFS}" \
    LC_ALL=POSIX \
    LFS_TGT=x86_64-darkforge-linux-gnu \
    PATH="${LFS}/tools/bin:/usr/bin" \
    MAKEFLAGS="-j32" \
    su lfs -s /bin/bash -c "bash ${SCRIPTS_DEST}/build-all.sh" || {
    fail "Build failed! Check logs in ${LFS}/sources/logs/"
}

echo ""
echo "============================================================"
echo -e "${GREEN} Phase 0 cross-compilation complete!${NC}"
echo "============================================================"
echo ""
echo "Next steps (run as root):"
echo ""
echo "  # Enter the chroot environment:"
echo "  sudo -E bash ${SCRIPTS_DEST}/023-chroot-setup.sh"
echo ""
echo "  # Then inside chroot, run these in order:"
echo "  bash /sources/toolchain-scripts/024-chroot-essentials.sh"
echo "  bash /sources/toolchain-scripts/025-gettext.sh"
echo "  bash /sources/toolchain-scripts/026-bison.sh"
echo "  bash /sources/toolchain-scripts/027-perl.sh"
echo "  bash /sources/toolchain-scripts/028-python.sh"
echo "  bash /sources/toolchain-scripts/029-texinfo.sh"
echo "  bash /sources/toolchain-scripts/030-util-linux.sh"
echo "  bash /sources/toolchain-scripts/031-cleanup.sh"