#!/usr/bin/env python3
"""
serve.py -- launch the DPL3 scene archive locally.

The archive viewer lazy-loads scene JSON via fetch(), which browsers block over
file://. This serves the viewer/ folder over http so it works. Run it, then the
browser opens automatically.

Threaded (parallel requests don't queue behind a large scene download) and sends
Cache-Control: no-store so a truncated response can never be cached and replayed
by the browser.

    python viewer/serve.py
"""
import http.server
import os
import webbrowser

PORT = 8765
os.chdir(os.path.dirname(os.path.abspath(__file__)))


class Handler(http.server.SimpleHTTPRequestHandler):
    def end_headers(self):
        self.send_header("Cache-Control", "no-store")
        super().end_headers()

    def log_message(self, fmt, *args):   # quieter console
        pass


url = "http://localhost:%d/archive.html" % PORT
print("DPL3 scene archive -> %s   (Ctrl+C to stop)" % url)
try:
    webbrowser.open(url)
except Exception:
    pass
with http.server.ThreadingHTTPServer(("", PORT), Handler) as httpd:
    try:
        httpd.serve_forever()
    except KeyboardInterrupt:
        print("\nstopped")