#!/bin/bash
set -e

echo "=== Linear Void Playout Service Starting ==="
echo "Playlist path: ${PLAYLIST_PATH:=/app/playlist/playlist.txt}"
echo "HLS segment duration: ${HLS_SEGMENT_DURATION:-6}s"
echo "HLS window size: ${HLS_WINDOW_SIZE:-24}"

# Ensure playlist directory and file exist
mkdir -p "$(dirname "$PLAYLIST_PATH")"
if [ ! -f "$PLAYLIST_PATH" ]; then
  echo "Warning: Playlist not found at $PLAYLIST_PATH. Creating demo playlist."
  cat > "$PLAYLIST_PATH" << EOF
# Linear Void Demo Playlist
file '/app/media/demo1.mp4'
file '/app/media/demo2.mp4'
EOF
fi

# Run normalization validation using the Go tool
echo "Validating playlist and enforcing normalization (ADR-001/ADR-003)..."
if ! /app/playlist-manager "$PLAYLIST_PATH"; then
  echo "ERROR: Playlist validation failed. Check logs."
  exit 1
fi

echo "Playlist validated successfully. Starting continuous HLS playout..."

mkdir -p /app/hls
rm -f /app/hls/playlist.m3u8 /app/hls/init.mp4 /app/hls/segment_*.ts /app/hls/segment_*.m4s

# Run FFmpeg in a loop for continuous playback
while true; do
  echo "[$(date)] Starting FFmpeg playout with browser-safe HLS encoding..."
  ffmpeg -re -f concat -safe 0 -i "$PLAYLIST_PATH" \
    -map 0:v:0 -map 0:a:0? \
    -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,fps=30,format=yuv420p" \
    -c:v libx264 -preset veryfast -pix_fmt yuv420p \
    -profile:v high -level 4.0 \
    -r 30 -g 60 -keyint_min 60 -sc_threshold 0 \
    -c:a aac -ar 48000 -ac 2 -b:a 128k \
    -f hls \
    -hls_time "${HLS_SEGMENT_DURATION}" \
    -hls_list_size "${HLS_WINDOW_SIZE}" \
    -hls_segment_type fmp4 \
    -hls_fmp4_init_filename init.mp4 \
    -strftime 1 \
    -hls_flags delete_segments+independent_segments \
    -hls_segment_filename "/app/hls/segment_%Y%m%d_%H%M%S.m4s" \
    "/app/hls/playlist.m3u8" || echo "FFmpeg exited with error (will restart in 5s per ADR-001 resilience requirements)..."

  echo "Playout loop crashed or ended. Restarting in 5 seconds..."
  sleep 5
done