From 40f766ad52b9b8ba4546a55339a9acd76c1c9896 Mon Sep 17 00:00:00 2001
From: Daniel Schadt <kingdread@gmx.de>
Date: Mon, 15 May 2023 23:55:34 +0200
Subject: initial version of .fit import

---
 .mypy.ini                 |  3 +++
 fietsboek/convert.py      | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 fietsboek/views/upload.py |  5 ++++-
 poetry.lock               | 13 ++++++++++++-
 pyproject.toml            |  1 +
 5 files changed, 67 insertions(+), 2 deletions(-)
 create mode 100644 fietsboek/convert.py

diff --git a/.mypy.ini b/.mypy.ini
index f77b4ba..5c60978 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -7,6 +7,9 @@ exclude = fietsboek/updater/scripts/.+\.py
 [mypy-brotli.*]
 ignore_missing_imports = True
 
+[mypy-fitparse.*]
+ignore_missing_imports = True
+
 [mypy-pyramid.*]
 ignore_missing_imports = True
 
diff --git a/fietsboek/convert.py b/fietsboek/convert.py
new file mode 100644
index 0000000..a73883d
--- /dev/null
+++ b/fietsboek/convert.py
@@ -0,0 +1,47 @@
+"""Conversion functions to convert between various recording formats."""
+import fitparse
+from gpxpy.gpx import GPX, GPXTrack, GPXTrackPoint, GPXTrackSegment
+
+
+def semicircles_to_deg(circles: int) -> float:
+    """Convert semicircles coordinate to degree coordinate.
+
+    :param circles: The coordinate value in semicircles.
+    :return: The coordinate in degrees.
+    """
+    return circles * (180 / 2**31)
+
+
+def from_fit(data: bytes) -> GPX:
+    """Reads a .fit as GPX data.
+
+    This uses the fitparse_ library under the hood.
+
+    .. _fitparse: https://pypi.org/project/fitparse/
+
+    :param data: The input bytes.
+    :return: The converted structure.
+    """
+    fitfile = fitparse.FitFile(data)
+    points = []
+    for record in fitfile.get_messages("record"):
+        values = record.get_values()
+        try:
+            point = GPXTrackPoint(
+                latitude=semicircles_to_deg(values["position_lat"]),
+                longitude=semicircles_to_deg(values["position_long"]),
+                elevation=values["altitude"],
+                time=values["timestamp"],
+            )
+        except KeyError:
+            pass
+        else:
+            points.append(point)
+    track = GPXTrack()
+    track.segments = [GPXTrackSegment(points)]
+    gpx = GPX()
+    gpx.tracks = [track]
+    return gpx
+
+
+__all__ = ["from_fit"]
diff --git a/fietsboek/views/upload.py b/fietsboek/views/upload.py
index 6fccdba..4fee76a 100644
--- a/fietsboek/views/upload.py
+++ b/fietsboek/views/upload.py
@@ -9,7 +9,7 @@ from pyramid.response import Response
 from pyramid.view import view_config
 from sqlalchemy import select
 
-from .. import actions, models, transformers, util
+from .. import actions, convert, models, transformers, util
 from ..models.track import TrackType, Visibility
 
 LOGGER = logging.getLogger(__name__)
@@ -52,6 +52,9 @@ def do_upload(request):
         request.session.flash(request.localizer.translate(_("flash.no_file_selected")))
         return HTTPFound(request.route_url("upload"))
 
+    if len(gpx) > 11 and gpx[9:12] == b"FIT":
+        gpx = convert.from_fit(gpx).to_xml().encode("utf-8")
+
     # Before we do anything, we check if we can parse the file.
     # gpxpy might throw different exceptions, so we simply catch `Exception`
     # here - if we can't parse it, we don't care too much why at this point.
diff --git a/poetry.lock b/poetry.lock
index a73ca0a..2ce66c8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -625,6 +625,17 @@ files = [
 docs = ["furo (>=2023.3.27)", "sphinx (>=6.1.3)", "sphinx-autodoc-typehints (>=1.23,!=1.23.4)"]
 testing = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "diff-cover (>=7.5)", "pytest (>=7.3.1)", "pytest-cov (>=4)", "pytest-mock (>=3.10)", "pytest-timeout (>=2.1)"]
 
+[[package]]
+name = "fitparse"
+version = "1.2.0"
+description = "Python library to parse ANT/Garmin .FIT files"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "fitparse-1.2.0.tar.gz", hash = "sha256:2d691022452dea6dabad13cc6e017ca467fe8a3a895cd3ac67a50a7bb716b4a9"},
+]
+
 [[package]]
 name = "gpxpy"
 version = "1.5.0"
@@ -2318,4 +2329,4 @@ test = ["zope.testing"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "24a8b1fc2e405bf9b4e61b85b5bac0890cc5344b15685fa8c3674d4aa7ad390a"
+content-hash = "fbb50a44304a40cbcd0a59a5e908dd547b3619db66329b8b17a44d56f069f633"
diff --git a/pyproject.toml b/pyproject.toml
index dc8d9a0..9ce137c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,6 +53,7 @@ termcolor = "^2.1.1"
 filelock = "^3.8.2"
 brotli = "^1.0.9"
 click-option-group = "^0.5.5"
+fitparse = "^1.2.0"
 
 [tool.poetry.group.docs]
 optional = true
-- 
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