#!/bin/bash
# GRUB UEFI install with dual-boot (Windows on /dev/nvme0n1p3 via os-prober).

# shellcheck source=common.sh
source "$(dirname "${BASH_SOURCE[0]}")/common.sh"

install_grub() {
    step "Installing GRUB (UEFI, bootloader-id=$BOOTLOADER_ID)"

    local TARGET="${TARGET:-/mnt}"

    if ! is_uefi; then
        die "non-UEFI boot detected; this installer only supports UEFI"
    fi

    # Configure /etc/default/grub
    cat > "$TARGET/etc/default/grub" <<'GRUBEOF'
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="Void"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=4 nvidia-drm.modeset=1"
GRUB_CMDLINE_LINUX=""
GRUB_DISABLE_OS_PROBER=false
GRUB_TERMINAL_OUTPUT="gfxterm"
GRUB_GFXMODE=auto
GRUBEOF

    # Make sure os-prober can see the NTFS partitions to enumerate Windows.
    run_chroot "modprobe efivarfs 2>/dev/null || true"
    run_chroot "xbps-install -y os-prober ntfs-3g >/dev/null 2>&1 || true"

    run_chroot "grub-install \
        --target=x86_64-efi \
        --efi-directory=/boot/efi \
        --bootloader-id='$BOOTLOADER_ID' \
        --recheck"

    # Ensure os-prober actually runs (some hosts skip it without this).
    mkdir -p "$TARGET/etc/grub.d"

    # Generate config
    run_chroot "grub-mkconfig -o /boot/grub/grub.cfg"

    # Verify Windows entry was found (best-effort, non-fatal in test mode)
    if grep -q -i 'windows\|microsoft' "$TARGET/boot/grub/grub.cfg"; then
        ok "Windows boot entry detected in grub.cfg"
    else
        if [[ "${TEST_MODE:-0}" == "1" ]]; then
            log "no Windows entry (expected in test mode)"
        else
            warn "no Windows entry in grub.cfg — os-prober may have failed; you can re-run grub-mkconfig later"
        fi
    fi

    ok "GRUB installed"
}