// Server pipeline — Phase 2 (stub) + planned architecture
// Receiver machine (X11, RTX 3080, NVDEC)
digraph server_pipeline {
    graph [fontname="monospace" bgcolor="#1e1e2e" rankdir=TB pad="0.6" splines=polyline]
    node  [fontname="monospace" fontcolor="#cdd6f4" style=filled shape=box
           fillcolor="#313244" color="#585b70" margin="0.25,0.12"]
    edge  [color="#585b70" fontname="monospace" fontcolor="#a6adc8"]

    net    [label="TCP :4444" shape=parallelogram fillcolor="#1e2a3e" color="#89b4fa"]
    python [label="Python app\n(stream/manager.py)" shape=parallelogram fillcolor="#2a2a3e" color="#cba6f7"]

    subgraph cluster_implemented {
        label="Implemented (Phase 2)" fontcolor="#a6e3a1" color="#a6e3a1" fontname="monospace"

        listener [label="Listener\n─────────────\nTCP accept loop\nspawns task per client\nreads WirePacket headers\ncounts video/audio pkts\nlogs keyframes + ts"
                  fillcolor="#1e2d3e" color="#89b4fa"]
    }

    subgraph cluster_planned {
        label="Planned" fontcolor="#f38ba8" color="#f38ba8" fontname="monospace" style=dashed

        decoder  [label="Decoder  (Phase 3)\n─────────────\nNVDEC H.264 → NV12\nGPU frames" fillcolor="#2d1e1e" color="#f38ba8"]
        scene    [label="Scene Detector  (Phase 3)\n─────────────\nffmpeg select filter\nin-process (no subprocess)\nJPEG → frames/\nframes/index.json" fillcolor="#2d1e1e" color="#f38ba8"]
        audio    [label="Audio Extractor  (Phase 4)\n─────────────\nAAC decode\nWAV chunks → audio/" fillcolor="#2d1e1e" color="#f38ba8"]
        writer   [label="Segment Writer  (Phase 3)\n─────────────\nfMP4 segments → stream/\nkeyframe boundaries" fillcolor="#2d1e1e" color="#f38ba8"]
        framebuf [label="Frame Buffer  (Phase 6)\n─────────────\nGPU ring buffer ~300 frames\nscrub: GPU→CPU on demand\n→ /dev/shm/cht_scrub_frame" fillcolor="#2d1e1e" color="#f38ba8"]
        ipc      [label="IPC Server  (Phase 5)\n─────────────\nUnix socket JSON-lines\ncommands: start/stop/get_frame\nevents: frame_detected/audio_chunk/…" fillcolor="#2d1e1e" color="#f38ba8"]
    }

    // Flow — implemented
    net -> listener [label="WirePacket"]

    // Flow — planned
    listener -> decoder  [style=dashed label="H.264 payload"]
    decoder  -> scene    [style=dashed label="NV12 frame"]
    decoder  -> writer   [style=dashed label="encoded pkt"]
    decoder  -> framebuf [style=dashed label="GPU frame"]
    decoder  -> audio    [style=dashed label="audio pkt"]
    scene    -> ipc      [style=dashed label="frame_detected"]
    audio    -> ipc      [style=dashed label="audio_chunk"]
    writer   -> ipc      [style=dashed label="segment_completed"]
    ipc      -> python   [style=dashed label="JSON-lines\n(Unix socket)"]

    // Outputs
    frames_dir [label="frames/\nindex.json + *.jpg" shape=folder fillcolor="#2a2a3e" color="#585b70"]
    audio_dir  [label="audio/\n*.wav chunks"         shape=folder fillcolor="#2a2a3e" color="#585b70"]
    stream_dir [label="stream/\n*.mp4 segments"      shape=folder fillcolor="#2a2a3e" color="#585b70"]
    shm        [label="/dev/shm/cht_scrub_frame\nraw RGBA pixels"   shape=folder fillcolor="#2a2a3e" color="#585b70"]

    scene    -> frames_dir [style=dashed]
    audio    -> audio_dir  [style=dashed]
    writer   -> stream_dir [style=dashed]
    framebuf -> shm        [style=dashed label="get_frame cmd"]
}