1st commit

main.py

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+#!/usr/bin/env python3
+"""
+Instagram HDR Assembler — Web Front
+------------------------------------
+Flask front end for assembling Instagram-compliant HDR JPEGs (gain map
+injection adapted from kostis-kounadis/instagram-hdr-assembler — see
+LICENSE). Gives you a browser form instead of a terminal, and
+surfaces the assembly report (including the "GainMapMin is negative"
+warning) on a results page.
+
+This file is just the entry point — see app/ for the app itself:
+  app/config.py       constants
+  app/jobs.py         in-memory job registry + heartbeat/reaper
+  app/validation.py   upload + Instagram resolution checks
+  app/assembler.py    gain-map assembly pipeline
+  app/routes.py       Flask routes
+
+Run directly:      python3 main.py
+Run in Docker:      see Dockerfile (gunicorn main:app)
+"""
+import os
+import sys
+
+from app import create_app
+from app.assembler import check_dependencies
+
+app = create_app()
+
+if __name__ == "__main__":
+    missing = check_dependencies()
+    if missing:
+        print(f"ERROR: missing required tools on PATH: {', '.join(missing)}", file=sys.stderr)
+        sys.exit(1)
+    port = int(os.environ.get("PORT", 5000))
+    app.run(host="0.0.0.0", port=port, debug=False)