astrodatagui: NewStarDialog: show preview of available data

astrodatagui/ui/NewStarDialog.py

@@ -1,7 +1,10 @@
-from PyQt5.QtWidgets import QDialog
+from PyQt5 import QtWidgets
+from PyQt5.QtWidgets import QDialog, QListWidgetItem
 from PyQt5 import uic
 import os
 
+from ...astrodatadownloader.astrodatadownloader import ObservationSource, getStarObservations
+
 class NewStarDialog(QDialog):
     def __init__(self):
         super().__init__()
@@ -13,8 +16,39 @@ class NewStarDialog(QDialog):
         self.btOk.clicked.connect(self.btOk_clicked)
         self.btCancel.clicked.connect(self.btCancel_clicked)
 
+    def showErrorMessage(self, title: str, msg: str):
+        QtWidgets.QMessageBox.question(self, title, msg,
+                                                      QtWidgets.QMessageBox.Ok)
+
     def btFetchData_clicked(self):
-        return
+        star = self.leStarIdentifier.text()
+        if not star:
+            self.showErrorMessage("No star identifier",
+                                  "No star identifier given, please insert one before proceeding")
+            return
+
+        sources = []
+        if(self.gbTESS.isChecked()):
+            sources.append(ObservationSource.TESS)
+        if(self.gbKepler.isChecked()):
+            sources.append(ObservationSource.KEPLER)
+        if(self.gbK2.isChecked()):
+            sources.append(ObservationSource.K2)
+
+        if(len(sources) == 0):
+            self.showErrorMessage("No source",
+                                  "Please select atleast one source before proceeding")
+            return
+
+        obs = getStarObservations(star, sources)
+        if(len(obs) == 0):
+            self.showErrorMessage("No observations found",
+                                  "No observationnal data has been found with the current filters")
+            return
+
+        self.listPreview.clear()
+        for o in obs:
+            self.listPreview.addItem(QListWidgetItem(f"{o['target_name']} - {o['obs_collection']} - {o['sequence_number']}"))
 
     def btOk_clicked(self):
         return