#!/usr/bin/env bash
# Pipeline-only smoke test: mirrors host/wayland.rs's gst pipeline but
# substitutes videotestsrc/audiotestsrc for pipewiresrc/pulsesrc and writes
# to a file instead of fdsink, so it runs without the portal/PipeWire and
# without an HTTP/iroh client. Catches AV1 encode + mpegtsmux + AAC mux
# regressions in ~5 seconds without any user interaction.
#
# Usage: scripts/smoke-pipeline.sh
# Exits 0 on pass, non-zero with diagnostic on fail.

set -euo pipefail

OUT="${TMPDIR:-/tmp}/pixelpass-smoke-$$.ts"
trap 'rm -f "$OUT"' EXIT

echo "[smoke] running gst pipeline (videotestsrc + audiotestsrc, ~2s) -> $OUT"
gst-launch-1.0 -q \
    mpegtsmux name=mux \
        ! queue ! filesink location="$OUT" \
    videotestsrc num-buffers=60 is-live=false \
        ! video/x-raw,width=640,height=360,framerate=30/1 \
        ! videoconvert ! video/x-raw,format=NV12 \
        ! vah264enc rate-control=cbr bitrate=2000 key-int-max=60 \
        ! h264parse config-interval=-1 \
        ! video/x-h264,stream-format=byte-stream,alignment=au \
        ! mux. \
    audiotestsrc num-buffers=94 is-live=false \
        ! audioconvert ! audioresample \
        ! audio/x-raw,rate=48000,channels=2 \
        ! avenc_aac bitrate=128000 ! aacparse ! mux.

[[ -s "$OUT" ]] || { echo "[smoke] FAIL: output file empty or missing"; exit 1; }
echo "[smoke] output size: $(stat -c %s "$OUT") bytes"

echo "[smoke] ffprobe stream listing"
ffprobe -v error -show_entries stream=index,codec_type,codec_name "$OUT" \
    | sed 's/^/        /'

# Real gate: mpv must actually decode video. The previous --frames=10 check was
# a false positive — if there's no video stream, --frames silently does nothing
# and mpv exits 0 after playing the audio. We instead grep mpv -v output for
# "video=playing"; "video=eof" means mpv saw no video track.
echo "[smoke] mpv video-decode probe (-v, asserting 'video=playing')"
MPV_LOG=$(mpv --no-config -v --vo=null --ao=null --frames=10 "$OUT" 2>&1)
echo "$MPV_LOG" | grep -E 'video=(playing|eof)' | sed 's/^/        /'
if echo "$MPV_LOG" | grep -q 'video=playing'; then
    echo "[smoke] PASS — pipeline produces an mpv-decodable video + audio stream"
else
    echo "[smoke] FAIL: mpv did not decode video (saw video=eof or no video state)"
    echo "[smoke] last 30 lines of mpv output:"
    echo "$MPV_LOG" | tail -30 | sed 's/^/        /'
    exit 1
fi

# ── quality-preset downscale check ────────────────────────────────────────
# Mirrors the videoscale step host/pipeline.rs inserts for a non-Source preset:
# AFTER videoconvert (scaling system-memory NV12, not the raw source format) and
# pinned to an exact even WxH computed from the source size. A 16:9 source @
# 480p wants width 853.3 -> 852 even. Asserts the negotiated size matches and
# the encoder accepts it. Guards both the "even-width caveat" and the
# negotiation/placement regression that squashed the picture.
SCALED="${TMPDIR:-/tmp}/pixelpass-smoke-scaled-$$.ts"
trap 'rm -f "$OUT" "$SCALED"' EXIT
echo "[smoke] downscale check: 1920x1080 -> 852x480 (videoscale after videoconvert)"
gst-launch-1.0 -q \
    mpegtsmux name=mux ! queue ! filesink location="$SCALED" \
    videotestsrc num-buffers=30 is-live=false \
        ! video/x-raw,width=1920,height=1080,framerate=30/1 \
        ! videorate ! video/x-raw,framerate=30/1 \
        ! queue ! videoconvert ! video/x-raw,format=NV12 \
        ! videoscale ! video/x-raw,format=NV12,width=852,height=480 \
        ! vah264enc rate-control=cbr bitrate=1000 key-int-max=60 \
        ! h264parse config-interval=-1 \
        ! video/x-h264,stream-format=byte-stream,alignment=au ! mux. \
    audiotestsrc num-buffers=47 is-live=false \
        ! audioconvert ! audioresample ! audio/x-raw,rate=48000,channels=2 \
        ! avenc_aac bitrate=128000 ! aacparse ! mux.

SCALED_DIMS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height \
    -of csv=p=0 "$SCALED" | head -1)
SCALED_W=${SCALED_DIMS%,*}
SCALED_H=${SCALED_DIMS#*,}
echo "        negotiated ${SCALED_W}x${SCALED_H}"
if [[ "$SCALED_H" == "480" && $((SCALED_W % 2)) -eq 0 && "$SCALED_W" -lt 1920 ]]; then
    echo "[smoke] PASS — downscale produced an even width below source (proportional)"
else
    echo "[smoke] FAIL: expected even width < 1920 at height 480, got ${SCALED_W}x${SCALED_H}"
    exit 1
fi