From 3140ea434d43a7ca8b4be11b26bafafc4ebdfdb8 Mon Sep 17 00:00:00 2001
From: Raoul Snyman <raoul@snyman.info>
Date: Wed, 8 Nov 2017 22:06:48 -0700
Subject: [PATCH] Add support for a multi to single setting migration

---
 openlp/core/common/settings.py | 60 ++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 14 deletions(-)

diff --git a/openlp/core/common/settings.py b/openlp/core/common/settings.py
index a6bc549f1..6726624ef 100644
--- a/openlp/core/common/settings.py
+++ b/openlp/core/common/settings.py
@@ -62,6 +62,30 @@ def media_players_conv(string):
     return string
 
 
+def upgrade_monitor(number, x_position, y_position, height, width, can_override, can_display_on_monitor):
+    """
+    Upgrade them monitor setting from a few single entries to a composite JSON entry
+
+    :param int number: The old monitor number
+    :param int x_position: The X position
+    :param int y_position: The Y position
+    :param bool can_override: Are the screen positions overridden
+    :param bool can_display_on_monitor: Can OpenLP display on the monitor
+    :returns dict: Dictionary with the new value
+    """
+    return {
+        number: {
+            'displayGeometry': {
+                'x': x_position,
+                'y': y_position,
+                'height': height,
+                'width': width
+            }
+        },
+        'canDisplayOnMonitor': can_display_on_monitor
+    }
+
+
 class Settings(QtCore.QSettings):
     """
     Class to wrap QSettings.
@@ -255,7 +279,9 @@ class Settings(QtCore.QSettings):
         ('core/logo file', 'core/logo file', [(str_to_path, None)]),
         ('presentations/last directory', 'presentations/last directory', [(str_to_path, None)]),
         ('images/last directory', 'images/last directory', [(str_to_path, None)]),
-        ('media/last directory', 'media/last directory', [(str_to_path, None)])
+        ('media/last directory', 'media/last directory', [(str_to_path, None)]),
+        (['core/monitor', 'core/x position', 'core/y position', 'core/height', 'core/width', 'core/override',
+          'core/display on monitor'], 'core/monitors', [(upgrade_monitor, [1, 0, 0, None, None, False, False])])
     ]
 
     @staticmethod
@@ -464,31 +490,37 @@ class Settings(QtCore.QSettings):
         for version in range(current_version, __version__):
             version += 1
             upgrade_list = getattr(self, '__setting_upgrade_{version}__'.format(version=version))
-            for old_key, new_key, rules in upgrade_list:
+            for old_keys, new_key, rules in upgrade_list:
                 # Once removed we don't have to do this again. - Can be removed once fully switched to the versioning
                 # system.
-                if not self.contains(old_key):
+                if not isinstance(old_keys, (tuple, list)):
+                    old_keys = [old_keys]
+                if not any([self.contains(old_key) for old_key in old_keys]):
+                    log.warning('One of {} does not exist, skipping upgrade'.format(old_keys))
                     continue
                 if new_key:
                     # Get the value of the old_key.
-                    old_value = super(Settings, self).value(old_key)
+                    old_values = [super(Settings, self).value(old_key) for old_key in old_keys]
                     # When we want to convert the value, we have to figure out the default value (because we cannot get
                     # the default value from the central settings dict.
                     if rules:
-                        default_value = rules[0][1]
-                        old_value = self._convert_value(old_value, default_value)
+                        default_values = rules[0][1]
+                        if not isinstance(default_values, (list, tuple)):
+                            default_values = [default_values]
+                        old_values = [self._convert_value(old_value, default_value)
+                                      for old_value, default_value in zip(old_values, default_values)]
                     # Iterate over our rules and check what the old_value should be "converted" to.
-                    for new, old in rules:
+                    new_value = None
+                    for new_rule, old_rule in rules:
                         # If the value matches with the condition (rule), then use the provided value. This is used to
                         # convert values. E. g. an old value 1 results in True, and 0 in False.
-                        if callable(new):
-                            old_value = new(old_value)
-                        elif old == old_value:
-                            old_value = new
+                        if callable(new_rule):
+                            new_value = new_rule(*old_values)
+                        elif old_rule in old_values:
+                            new_value = new_rule
                             break
-                    self.setValue(new_key, old_value)
-                if new_key != old_key:
-                    self.remove(old_key)
+                    self.setValue(new_key, new_value)
+                [self.remove(old_key) for old_key in old_keys if old_key != new_key]
         self.setValue('settings/version', version)
 
     def value(self, key):