From d86aeeb9bea31e6295a396c64bec998798cb218e Mon Sep 17 00:00:00 2001
From: BRAUN REMI <remi.braun@unistra.fr>
Date: Fri, 18 Oct 2024 13:35:40 +0200
Subject: [PATCH] FIX: Don't try to mosaic bands of mono-mosaics

---
 CHANGES.md       |  1 +
 eosets/mosaic.py | 49 +++++++++++++++++++++++++++++-------------------
 2 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index a8abf23..a395ebc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@
 
 - FIX: Fix band retrieving when the env variable `CI_EOREADER_BAND_FOLDER` is set, in case of multiple files of the same band from different satellite data are present in the directory
 - FIX: Don't force set `remove_tmp` to `True` for `eoreader.Product` in `Mosaic`.
+- FIX: Don't try to mosaic bands of mono-mosaics
 - CI: Add more tests
 
 ## 0.2.3 (2024-10-16)
diff --git a/eosets/mosaic.py b/eosets/mosaic.py
index a3a6c82..5c66b6c 100644
--- a/eosets/mosaic.py
+++ b/eosets/mosaic.py
@@ -399,26 +399,37 @@ def load(
         for band in bands_path:
             output_path = bands_path[band]
             if not output_path.is_file():
-                LOGGER.debug(f"Merging bands {to_str(band)[0]}")
-                if self.mosaic_method == MosaicMethod.VRT:
-                    prod_paths = []
-                    for prod_path in prod_band_paths[band]:
-                        out_path, exists = self._get_out_path(
-                            os.path.basename(prod_path)
-                        )
-                        if not exists:
-                            if AnyPath(prod_path).parent.is_relative_to(self.output):
-                                # If EOReader's band: move
-                                shutil.move(prod_path, out_path)
-                            else:
-                                # If raw product's band: copy
-                                files.copy(prod_path, out_path)
-                        prod_paths.append(out_path)
-                else:
-                    prod_paths = prod_band_paths[band]
+                if self.nof_prods > 1:
+                    LOGGER.debug(f"Merging bands {to_str(band)[0]}")
+                    if self.mosaic_method == MosaicMethod.VRT:
+                        prod_paths = []
+                        for prod_path in prod_band_paths[band]:
+                            out_path, exists = self._get_out_path(
+                                os.path.basename(prod_path)
+                            )
+                            if not exists:
+                                if AnyPath(prod_path).parent.is_relative_to(
+                                    self.output
+                                ):
+                                    # If EOReader's band: move
+                                    shutil.move(prod_path, out_path)
+                                else:
+                                    # If raw product's band: copy
+                                    files.copy(prod_path, out_path)
+                            prod_paths.append(out_path)
+                    else:
+                        prod_paths = prod_band_paths[band]
 
-                # Don't pass kwargs here because of unwanted errors
-                merge_fct(prod_paths, output_path)
+                    # Don't pass kwargs here because of unwanted errors
+                    merge_fct(prod_paths, output_path)
+                else:
+                    prod_path = prod_band_paths[band][0]
+                    if AnyPath(prod_path).parent.is_relative_to(self.output):
+                        # If EOReader's band: move
+                        shutil.move(prod_path, output_path)
+                    else:
+                        # If raw product's band: copy
+                        files.copy(prod_path, output_path)
 
             # Load in memory and update attribute
             merged_dict[band] = self._update_attrs(