#!/bin/bash
# bos-first-boot — one-shot hardware probe after the first graphical login.
#
# Detects NVIDIA (offer file + notify; never auto-installs a driver), a VM
# without GL, and HiDPI (hint file only — never rewrites monitors.json).
#
# Non-fatal: missing tools, notify-send, or hyprctl must not block login.
# Guarded with `command -v`. Flag: ~/.local/state/bos/first-boot-done.
set -u

STATE_DIR="${XDG_STATE_HOME:-$HOME/.local/state}/bos"
FLAG="$STATE_DIR/first-boot-done"
NVIDIA_OFFER="$STATE_DIR/nvidia-offer.json"
HIDPI_HINT="$STATE_DIR/hidpi-hint.json"
VM_HINT="$STATE_DIR/vm-gl-hint.json"

# Never run on the live/installer session — only on an installed system.
[[ "$(id -un)" == "liveuser" ]] && exit 0

# Already probed this home.
[[ -f "$FLAG" ]] && exit 0

notify() {
    local msg="$1"
    local urgency="${2:-normal}"
    command -v notify-send >/dev/null 2>&1 || return 0
    notify-send -u "$urgency" "BOS" "$msg" 2>/dev/null || true
}

json_escape() {
    printf '%s' "$1" | sed 's/\\/\\\\/g; s/"/\\"/g'
}

iso_now() {
    date -Iseconds 2>/dev/null || date -u +%Y-%m-%dT%H:%M:%SZ
}

# Best-effort: hyprland.start can beat the notification daemon by a beat.
if [[ -z "${WAYLAND_DISPLAY:-}${DISPLAY:-}" ]]; then
    sleep 1
fi

mkdir -p "$STATE_DIR" 2>/dev/null || exit 0

# ---------------------------------------------------------------------------
# NVIDIA — hardware only. Do not install nvidia / nvidia-utils.
# ---------------------------------------------------------------------------
nvidia_present=0
nvidia_pci=""
if command -v lspci >/dev/null 2>&1; then
    nvidia_pci="$(lspci -d 10de: -nn 2>/dev/null | grep -iE 'VGA|3D|Display' || true)"
    [[ -n "$nvidia_pci" ]] && nvidia_present=1
fi
if [[ "$nvidia_present" != "1" ]]; then
    if [[ -d /proc/driver/nvidia || -d /sys/module/nvidia ]]; then
        nvidia_present=1
        nvidia_pci="${nvidia_pci:-module}"
    fi
fi
if [[ "$nvidia_present" == "1" ]]; then
    cat >"$NVIDIA_OFFER" <<EOF
{
  "detected": true,
  "pci": "$(json_escape "$nvidia_pci")",
  "driver_on_iso": false,
  "auto_install": false,
  "message": "NVIDIA GPU detected. The proprietary driver is not on the ISO.",
  "offered_at": "$(iso_now)"
}
EOF
    notify "NVIDIA GPU detected. The proprietary driver is not on the ISO — open BOS Settings later. Nothing was installed." normal
fi

# ---------------------------------------------------------------------------
# VM without GL (no /dev/dri). Notify only when both are true.
# ---------------------------------------------------------------------------
virt="none"
if command -v systemd-detect-virt >/dev/null 2>&1; then
    virt="$(systemd-detect-virt 2>/dev/null || true)"
    [[ -n "$virt" ]] || virt="none"
fi
has_gl=0
shopt -s nullglob
dri_nodes=(/dev/dri/card* /dev/dri/renderD*)
(( ${#dri_nodes[@]} > 0 )) && has_gl=1
shopt -u nullglob

if [[ "$virt" != "none" && "$has_gl" != "1" ]]; then
    cat >"$VM_HINT" <<EOF
{
  "virt": "$(json_escape "$virt")",
  "gl": false,
  "dri": false,
  "noted_at": "$(iso_now)"
}
EOF
    notify "This looks like a virtual machine without hardware GL. Hyprland may use software rendering." normal
fi

# ---------------------------------------------------------------------------
# HiDPI — hint file for bos-settings. Do not rewrite monitors.json.
# scale > 1 from hyprctl, or computed DPI >= 140.
# ---------------------------------------------------------------------------
if command -v hyprctl >/dev/null 2>&1 && command -v python3 >/dev/null 2>&1; then
    # Compositor may still be settling when autostart fires.
    mon_json=""
    tries=0
    while [[ -z "$mon_json" && "$tries" -lt 5 ]]; do
        mon_json="$(hyprctl -j monitors 2>/dev/null || true)"
        if [[ -z "$mon_json" || "$mon_json" == "[]" ]]; then
            mon_json=""
            sleep 1
        fi
        tries=$((tries + 1))
    done
    if [[ -n "$mon_json" ]]; then
        BOS_HYPR_MONITORS="$mon_json" python3 - "$HIDPI_HINT" "$(iso_now)" <<'PY' || true
import json, os, sys
hint_path, noted_at = sys.argv[1], sys.argv[2]
try:
    monitors = json.loads(os.environ.get("BOS_HYPR_MONITORS") or "")
except Exception:
    sys.exit(0)
if not isinstance(monitors, list):
    sys.exit(0)

hits = []
for m in monitors:
    if not isinstance(m, dict):
        continue
    name = m.get("name") or m.get("output") or ""
    try:
        scale = float(m.get("scale") or 1)
    except (TypeError, ValueError):
        scale = 1.0
    try:
        w = int(m.get("width") or 0)
        h = int(m.get("height") or 0)
    except (TypeError, ValueError):
        w = h = 0
    mm_w = mm_h = 0
    phys = m.get("physicalSize")
    if isinstance(phys, dict):
        mm_w = phys.get("x") or phys.get("width") or 0
        mm_h = phys.get("y") or phys.get("height") or 0
    elif isinstance(phys, (list, tuple)) and len(phys) >= 2:
        mm_w, mm_h = phys[0], phys[1]
    else:
        mm_w = m.get("physicalWidth") or 0
        mm_h = m.get("physicalHeight") or 0
    try:
        mm_w = float(mm_w or 0)
        mm_h = float(mm_h or 0)
    except (TypeError, ValueError):
        mm_w = mm_h = 0.0
    dpi = round(w / (mm_w / 25.4), 1) if mm_w and w else 0.0
    px_per_mm = round(w / mm_w, 3) if mm_w and w else 0.0
    # High px/mm (dense panel) or Hyprland already chose scale > 1.
    hidpi = scale > 1.01 or dpi >= 140
    if hidpi:
        hits.append({
            "name": name,
            "width": w,
            "height": h,
            "scale": scale,
            "dpi": dpi,
            "px_per_mm": px_per_mm,
        })

if not hits:
    sys.exit(0)
with open(hint_path, "w") as f:
    json.dump({
        "suggested": True,
        "rewrote_monitors_json": False,
        "reason": "scale > 1 or DPI >= 140",
        "monitors": hits,
        "noted_at": noted_at,
    }, f, indent=2)
    f.write("\n")
PY
    fi
fi

# Mark done even if every probe was a no-op — do not nag next login.
printf '%s\n' "$(iso_now)" >"$FLAG" 2>/dev/null || true
exit 0