#!/usr/bin/env sh
# keru-install — the Keru OS TUI installer
#
# Walks you through crafting your exact system, then writes make.conf and
# kicks off the build. Everything is swappable here, at install time, and
# locked in when you boot.
#
# Designed to run from the Keru live ISO. Backed by dialog/whiptail if
# present; falls back to plain prompted input. All shell, no magic.

set -eu

. "$(dirname "$0")/../scripts/common.sh"

# ---- defaults (mirror profile/make.conf) --------------------------------
OUT="${MAKE_CONF_OUT:-/tmp/keru/make.conf}"
DROP="/tmp/keru"
mkdir -p "$DROP"

# ---- menu helpers -------------------------------------------------------
pick() { # prompt, array-of-labels, defaults -> writes choice to $CHOICE
    local prompt="$1"; shift
    local default="$1"; shift
    CHOICE="$default"
    if command -v dialog >/dev/null 2>&1; then
        local args=()
        local i=0
        for opt in "$@"; do
            args+=("$i" "$opt")
            i=$((i+1))
        done
        local sel
        sel=$(dialog --stdout --no-cancel --menu "$prompt" 15 60 8 \
                  --default-item "$default" "${args[@]}") || true
        CHOICE=$(eval "printf '%s' \"\${$((sel+1)):-\$default}\"" 2>/dev/null || printf '%s' "$default")
    else
        printf '%s\n' "== $prompt =="
        local n=1
        for opt in "$@"; do
            printf '  %s) %s\n' "$n" "$opt"
            n=$((n+1))
        done
        printf 'Select [%s]: ' "$default"
        read -r sel
        [ -n "$sel" ] && CHOICE=$(eval "printf '%s' \"\${$sel}\"") || CHOICE="$default"
    fi
}

# ---- network check -------------------------------------------------------
# The ISO carries only the installer. Everything else (kernels, init systems,
# libcs, filesystems, tools) is fetched and built at install time, so a working
# network connection is a hard prerequisite.
require_network() {
    local ok=0
    # try a few reachability probes
    for host in mirror.keru.org github.com 1.1.1.1; do
        if command -v ping >/dev/null 2>&1 && ping -c1 -W2 "$host" >/dev/null 2>&1; then ok=1; break; fi
        # fallback: plain connect test via /dev/tcp
        case "$host" in
            *.*.*.*) : ;; # ip already covered by ping
        esac
    done
    if [ "$ok" = "0" ]; then
        if command -v nc >/dev/null 2>&1; then
            nc -z -w5 mirror.keru.org 443 >/dev/null 2>&1 && ok=1
        fi
    fi
    [ "$ok" = "1" ]
}

# ---- network configuration ------------------------------------------------
configure_network() {
    msg "network configuration"
    if command -v nmtui >/dev/null 2>&1; then
        nmtui 2>/dev/null && return 0
    fi
    if command -v dialog >/dev/null 2>&1 && command -v wifi-menu >/dev/null 2>&1; then
        dialog --stdout --menu "Network" 12 40 3 \
            1 "Wireless (wifi-menu)" 2 "Ethernet (skip)" 3 "Manual (ip)" 2>/dev/null
    fi
    read -r -p "Bring up Ethernet (DHCP) now? [Y/n] " eth
    case "$eth" in
        n|N|no) : ;;
        *) command -v dhcpcd >/dev/null 2>&1 && (dhcpcd >/dev/null 2>&1 &) || true ;;
    esac
}

banner "Keru OS — network required"
info "the ISO only carries the installer."
info "the system you choose (init, libc, fs, kernel, tools) is fetched and"
info "built from the network during installation. a connection is required."

if require_network; then
    msg "network: connected"
else
    warn "network: not detected"
    read -r -p "Configure the network now? [Y/n] " cfg
    case "$cfg" in
        n|N|no) die "a network connection is required to install Keru" ;;
        *) configure_network ;;
    esac
    require_network || die "still no network connection — cannot install"
    msg "network: connected"
fi

# ---- swappable selections ------------------------------------------------
banner "Keru OS — craft your system"

pick "Init system" runit  runit s6 openrc systemd busybox-init sysvinit dinit shepherd
INIT="$CHOICE"

pick "C library" glibc glibc musl uclibc-ng
LIBC="$CHOICE"

pick "Filesystem" ext4 ext4 ext2 ext3 btrfs xfs zfs f2fs jfs reiserfs
TARGET_FS="$CHOICE"

pick "Kernel" linux linux linux-lts linux-hardened linux-cachyos linux-zen
KERNEL="$CHOICE"

pick "Privilege elevation (sudo alternative)" doas doas sudo opendoas su
SUDO="$CHOICE"

pick "Network tools" nmtui nmtui networkmanager connman systemd-networkd
NET="$CHOICE"

# ---- assemble make.conf ------------------------------------------------
msg "writing $OUT"
cat > "$OUT" <<EOF
# Generated by keru-install — hand-tune then rebuild if you like.
INIT=$INIT
LIBC=$LIBC
TARGET_FS=$TARGET_FS
KERNEL=$KERNEL
SUDO=$SUDO
NET=$NET
LICENSE_ACCEPT=(*)
EOF

msg "profile complete:"
cat "$OUT"

read -r -p "Build now? [y/N] " go
case "$go" in
    y|Y|yes)
        "$(dirname "$0")/../scripts/build-root.sh" "$OUT"
        ;;
    *)
        msg "saved profile to $OUT (run scripts/build-root.sh to build)"
        ;;
esac