diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..e4f40ad
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,46 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1760164275,
+        "narHash": "sha256-gKl2Gtro/LNf8P+4L3S2RsZ0G390ccd5MyXYrTdMCFE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "362791944032cb532aabbeed7887a441496d5e6e",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "pyproject-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1759739877,
+        "narHash": "sha256-XfcxM4nzSuuRmFGiy/MhGwYf9EennQ2+0jjR2aJqtKE=",
+        "owner": "pyproject-nix",
+        "repo": "pyproject.nix",
+        "rev": "966e0961f9670f847439ba90dc25ffaa112d8803",
+        "type": "github"
+      },
+      "original": {
+        "owner": "pyproject-nix",
+        "repo": "pyproject.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "pyproject-nix": "pyproject-nix"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..832cf8c
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,41 @@
+{
+  description = "Flake using pyproject.toml metadata";
+
+  inputs.pyproject-nix.url = "github:pyproject-nix/pyproject.nix";
+  inputs.pyproject-nix.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs =
+    { nixpkgs, pyproject-nix, ... }:
+    let
+      inherit (nixpkgs) lib;
+      forAllSystems = lib.genAttrs lib.systems.flakeExposed;
+
+      project = pyproject-nix.lib.project.loadPyproject {
+        projectRoot = ./.;
+      };
+
+      pythonAttr = "python3";
+    in
+    {
+      devShells = forAllSystems (system: {
+        default =
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+            python = pkgs.${pythonAttr};
+            pythonEnv = python.withPackages (project.renderers.withPackages { inherit python; });
+          in
+          pkgs.mkShell { packages = [ pythonEnv ]; };
+      });
+
+      packages = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          python = pkgs.${pythonAttr};
+        in
+        {
+          default = python.pkgs.buildPythonPackage (project.renderers.buildPythonPackage { inherit python; });
+        }
+      );
+    };
+}
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..6179bdc
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,9 @@
+[project]
+name = "hello-python"
+version = "0.1.0"
+description = "A minimal pyproject.toml"
+authors = [ ]
+requires-python = ">=3.13"
+dependencies = [ "insightface", "opencv-python", "matplotlib" ]
+
+
diff --git a/src/faceswap.py b/src/faceswap.py
new file mode 100644
index 0000000..d04736c
--- /dev/null
+++ b/src/faceswap.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import cv2
+import random # TODO: seed!
+
+import insightface
+from insightface.app import FaceAnalysis
+
+from insightface.model_zoo.inswapper import INSwapper
+from insightface.app.common import Face
+
+SWAPPING_MODEL = 'inswapper_128.onnx'
+
+class Faceswapper:
+    def __init__(self):
+        self._app : FaceAnalysis = FaceAnalysis(name='buffalo_l')
+        self._model : INSwapper
+        self._source : cv2.typing.MatLike|None = None
+        self._source_faces : list[Face] = []
+        self._template_faces : list[Face] = []
+
+        self._app.prepare(ctx_id=0, det_size=(640, 640))
+
+    def prepare_model(self) -> None:
+        self._model = insightface.model_zoo.get_model(SWAPPING_MODEL, download=True, download_zip=True) # Revealed type: "INSwapper"
+
+    def set_source(self, path: str) -> None:
+        self._source = cv2.imread(path)
+
+    def detect_source_faces(self):
+        self._source_faces = self._app.get(self._source)
+
+    def add_template_faces(self, template_path: str):
+        self._template_faces += [self._app.get(cv2.imread(template_path))]
+
+    def swap(self) -> cv2.typing.MatLike:
+        work_copy = self._source_faces.copy()
+        for i, face in enumerate(self._source_faces):
+            print(f"Replacing face {i+1}/{len(self._source_faces)}...", end="", flush=True);
+            imposed_face = random.choice(self._template_faces)
+            work_copy = self._model.get(work_copy, face, imposed_face, paste_back=True)
+            print(" done!")
+
+        return work_copy
+
+    @staticmethod
+    def readFile(path: str) -> cv2.typing.MatLike|None:
+        return cv2.imread(path)
+
+
+def main():
+    swapper = Faceswapper()
+    swapper.prepare_model()
+
+
+
+if __name__ == '__main__':
+    main()