apiVersion: v1
kind: ConfigMap
metadata:
  name: immich-rsync-script
  namespace: photo
data:
  rsync.py: |
    import os
    import re
    import subprocess
    import threading
    import time
    import json
    from datetime import datetime, timezone

    SRC = "/source/"
    DST = "/data/"
    OUT_DIR = "/www"

    state_lock = threading.Lock()
    state = {
        "status": "starting",
        "percent": 0.0,
        "processed": 0,
        "total": 0,
        "rate": "",
        "eta": "",
        "bytes_transferred": "",
        "started_at": None,
        "finished_at": None,
        "error": None,
        "returncode": None,
    }

    # matches lines from `rsync --info=progress2`, e.g.:
    #   1,234,567  43%   12.34MB/s    0:00:12 (xfr#12, to-chk=345/400)
    # the "(xfr#N, to-chk=X/Y)" suffix only appears on some lines (once a
    # file completes), so processed/total only update when it's present.
    LINE_RE = re.compile(
        r"^\s*([\d,]+)\s+(\d+)%\s+(\S+/s)\s+([\d:]+)"
        r"(?:\s+\(xfr#(\d+),\s+(?:to-chk|ir-chk)=(\d+)/(\d+)\))?\s*$"
    )


    def render_html(s):
        progress_html = ""
        if s["status"] == "scanning":
            progress_html = "<p>Building file list...</p>"
        elif s["status"] in ("syncing", "done", "error"):
            progress_html = f"""
    <p>Progress: {s['processed']} / {s['total']} files ({s['percent']:.1f}%)</p>
    <div class="bar"><div class="fill" style="width:{s['percent']:.1f}%"></div></div>
    <p>Transferred: {s['bytes_transferred']} bytes &middot; {s['rate']} &middot; ETA {s['eta']}</p>
    """
        error_html = f"<p class='err'>Error: {s['error']}</p>" if s["error"] else ""
        return f"""<!doctype html>
    <html><head><meta charset="utf-8"><title>Immich NAS rsync</title>
    <meta http-equiv="refresh" content="5">
    <style>
    body {{ font-family: monospace; background: #111; color: #eee; padding: 2rem; }}
    table {{ border-collapse: collapse; }}
    td {{ padding: .25rem 1.5rem .25rem 0; }}
    .bar {{ background: #333; border-radius: 4px; overflow: hidden; width: 300px; height: 14px; }}
    .fill {{ background: #4caf50; height: 100%; }}
    .err {{ color: #f66; }}
    </style></head><body>
    <h1>Immich NAS rsync</h1>
    <p>{SRC} &rarr; {DST}</p>
    <p>Status: <b>{s['status']}</b></p>
    {progress_html}
    {error_html}
    <table>
    <tr><td>Started</td><td>{s['started_at'] or '-'}</td></tr>
    <tr><td>Finished</td><td>{s['finished_at'] or '-'}</td></tr>
    <tr><td>Exit code</td><td>{s['returncode'] if s['returncode'] is not None else '-'}</td></tr>
    </table>
    </body></html>"""


    def write_output():
        with state_lock:
            s = dict(state)
        html = render_html(s)

        tmp = os.path.join(OUT_DIR, "index.html.tmp")
        with open(tmp, "w") as f:
            f.write(html)
        os.replace(tmp, os.path.join(OUT_DIR, "index.html"))

        tmp = os.path.join(OUT_DIR, "stats.json.tmp")
        with open(tmp, "w") as f:
            json.dump(s, f, indent=2)
        os.replace(tmp, os.path.join(OUT_DIR, "stats.json"))


    def run_rsync():
        with state_lock:
            state.update(status="scanning", started_at=datetime.now(timezone.utc).isoformat())
        write_output()

        proc = subprocess.Popen(
            [
                "rsync",
                "-a",
                "--info=progress2",
                "--no-inc-recursive",
                "--outbuf=L",
                SRC,
                DST,
            ],
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            text=True,
            bufsize=1,
        )

        last_write = 0.0
        tail = []
        for line in proc.stdout:
            tail.append(line)
            tail[:] = tail[-20:]

            m = LINE_RE.match(line)
            if m:
                bytes_transferred, percent, rate, eta, _xfr, to_chk_left, to_chk_total = m.groups()
                with state_lock:
                    state["status"] = "syncing"
                    state["bytes_transferred"] = bytes_transferred
                    state["percent"] = float(percent)
                    state["rate"] = rate
                    state["eta"] = eta
                    if to_chk_total is not None:
                        total = int(to_chk_total)
                        left = int(to_chk_left)
                        state["total"] = total
                        state["processed"] = total - left

            now = time.time()
            if now - last_write > 2:
                write_output()
                last_write = now

        returncode = proc.wait()

        with state_lock:
            state["returncode"] = returncode
            state["finished_at"] = datetime.now(timezone.utc).isoformat()
            if returncode == 0:
                state["status"] = "done"
                state["percent"] = 100.0
            else:
                state["status"] = "error"
                state["error"] = "".join(tail[-5:]).strip() or f"rsync exited {returncode}"
        write_output()


    def main():
        os.makedirs(OUT_DIR, exist_ok=True)
        write_output()
        run_rsync()
        # stay alive so the pod doesn't restart-loop after a one-shot sync;
        # the status page keeps showing the final result.
        while True:
            time.sleep(3600)


    if __name__ == "__main__":
        main()