#!/usr/bin/env bash
# p2-60 Lens Switcher proof renderer.
#
# Runs ON apricot. Drives flatpak Godot under a weston-headless Wayland host
# pointed at `res://engine/scenes/tests/lens_switcher_proof.tscn`. The scene
# instantiates the lens switcher widget, cycles through every loaded lens,
# and writes one PNG per lens to `user://screenshots/lens_<id>_<ts>.png`,
# printing `SCREENSHOT_PATH:<abs>` per shot.
#
# Caller-side (plum) entry point: scripts/p2-60-lens-proof-run.sh — that one
# pushes via the canonical fetch / worktree path used by apricot-run.sh, then
# invokes this script inside the scratch worktree.
#
# Env:
#   SCRATCH_DIR      worktree path containing src/game (required)
#   LOG_FILE         log destination (default /tmp/p2-60-lens-proof.log)
#   TIMEOUT_SEC      Godot timeout in seconds (default 90)

set -uo pipefail

SCRATCH_DIR="${SCRATCH_DIR:?SCRATCH_DIR is required}"
LOG_FILE="${LOG_FILE:-/tmp/p2-60-lens-proof.log}"
TIMEOUT_SEC="${TIMEOUT_SEC:-90}"

GODOT_USERDATA="$HOME/.var/app/org.godotengine.Godot/data/godot/app_userdata/Magic Civilization"
SHOT_DIR="$GODOT_USERDATA/screenshots"

echo "=== p2-60 Lens Switcher proof ==="
echo "SCRATCH_DIR: $SCRATCH_DIR"
echo "LOG: $LOG_FILE"
echo "Sandbox screenshot dir: $SHOT_DIR"

# Wipe prior lens screenshots so we only fetch this run's outputs.
mkdir -p "$SHOT_DIR"
rm -f "$SHOT_DIR"/lens_*.png 2>/dev/null || true

if ! command -v weston >/dev/null 2>&1; then
    echo "ERROR: weston not installed" >&2
    exit 2
fi

WESTON_SOCKET="p2-60-lens-$$"
WESTON_LOG="/tmp/p2-60-lens-weston.log"
echo "Starting weston (headless, socket=$WESTON_SOCKET)..."
weston --backend=headless --no-config --socket="$WESTON_SOCKET" \
    --width=1920 --height=360 \
    >"$WESTON_LOG" 2>&1 &
WESTON_PID=$!
sleep 1.5
if ! kill -0 "$WESTON_PID" 2>/dev/null; then
    echo "ERROR: weston failed to launch — see $WESTON_LOG" >&2
    tail -20 "$WESTON_LOG" >&2
    exit 3
fi
trap 'kill $WESTON_PID 2>/dev/null; wait $WESTON_PID 2>/dev/null' EXIT

XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}" \
timeout "$TIMEOUT_SEC" flatpak run --user \
    --filesystem=home \
    --socket=wayland \
    --unset-env=DISPLAY \
    --env=WAYLAND_DISPLAY="$WESTON_SOCKET" \
    --filesystem=xdg-run/${WESTON_SOCKET} \
    --env=SCREENSHOT_NAME="lens" \
    org.godotengine.Godot \
    --path "$SCRATCH_DIR/src/game" \
    --display-driver wayland \
    --rendering-driver opengl3 \
    --rendering-method gl_compatibility \
    res://engine/scenes/tests/lens_switcher_proof.tscn \
    >"$LOG_FILE" 2>&1
RC=$?

echo "--- Godot exit rc=$RC ---"
echo "--- Tail of log ---"
tail -40 "$LOG_FILE"
echo "-------------------"
echo "--- SCREENSHOT_PATH lines ---"
grep "SCREENSHOT_PATH:" "$LOG_FILE" || echo "(none)"
echo "-----------------------------"

SHOTS=( "$SHOT_DIR"/lens_*.png )
if [ ! -f "${SHOTS[0]}" ]; then
    echo "ERROR: no lens_*.png produced under $SHOT_DIR" >&2
    exit 1
fi

echo "Captured ${#SHOTS[@]} shots:"
ls -la "$SHOT_DIR"/lens_*.png

echo "=== Done ==="
exit 0