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# <pep8 compliant>

import bpy
from . import presets

# These operators are only defined because it seems impossible to directly edit properties from UI code…


# A sorting func for collections (working in-place).
# XXX Not optimized at all…
# XXX If some items in the collection do not have the sortkey property, they are just ignored…
def collection_property_sort(collection, sortkey, start_idx=0):
    while start_idx + 1 < len(collection):
        while not hasattr(collection[start_idx], sortkey):
            start_idx += 1
            if start_idx + 1 >= len(collection):
                return collection
        min_idx = start_idx
        min_prop = collection[start_idx]
        for i, prop in enumerate(collection[start_idx + 1:]):
            if not hasattr(prop, sortkey):
                continue
            if getattr(prop, sortkey) < getattr(min_prop, sortkey):
                min_prop = prop
                min_idx = i + start_idx + 1
        collection.move(min_idx, start_idx)
        start_idx += 1
    return collection


class RenderCopySettingsOPPrepare(bpy.types.Operator):
    """Prepare internal data for render_copy_settings (gathering all existing render settings, and scenes)"""
    bl_idname = "scene.render_copy_settings_prepare"
    bl_label = "Render: Copy Settings Prepare"
    bl_option = {'REGISTER'}

    @classmethod
    def poll(cls, context):
        return context.scene is not None

    def execute(self, context):
        cp_sett = context.scene.render_copy_settings

        # Get all available render settings, and update accordingly affected_settings…
        props = {}
        for prop in context.scene.render.bl_rna.properties:
            if prop.identifier in {'rna_type'}:
                continue
            if prop.is_readonly:
                continue
            props[prop.identifier] = prop.name
        corr = 0
        for i, sett in enumerate(cp_sett.affected_settings):
            if sett.strid not in props:
                cp_sett.affected_settings.remove(i - corr)
                corr += 1
            else:
                del props[sett.strid]
        for strid, name in props.items():
            sett = cp_sett.affected_settings.add()
            sett.name = "{} [{}]".format(name, strid)
            sett.strid = strid
        collection_property_sort(cp_sett.affected_settings, "name")

        # Get all available scenes, and update accordingly allowed_scenes…
        regex = None
        if cp_sett.filter_scene:
            try:
                import re
                try:
                    regex = re.compile(cp_sett.filter_scene)
                except Exception as e:
                    self.report({'ERROR_INVALID_INPUT'}, "The filter-scene regex did not compile:\n    (%s)." % str(e))
                    return {'CANCELLED'}
            except:
                regex = None
                self.report({'WARNING'}, "Unable to import the re module, regex scene filtering will be disabled!")
        scenes = set()
        for scene in bpy.data.scenes:
            if scene == bpy.context.scene:  # Exclude current scene!
                continue
            # If a valid filtering regex, only keep scenes matching it.
            if regex:
                if regex.match(scene.name):
                    scenes.add(scene.name)
            else:
                scenes.add(scene.name)
        for i, scene in enumerate(cp_sett.allowed_scenes):
            if scene.name not in scenes:
                cp_sett.allowed_scenes.remove(i)
            else:
                scenes.remove(scene.name)
        for scene in scenes:
            sett = cp_sett.allowed_scenes.add()
            sett.name = scene
        collection_property_sort(cp_sett.allowed_scenes, "name")

        return {'FINISHED'}


from bpy.props import EnumProperty


class RenderCopySettingsOPPreset(bpy.types.Operator):
    """Apply some presets of render settings to copy to other scenes"""
    bl_idname = "scene.render_copy_settings_preset"
    bl_label = "Render: Copy Settings Preset"
    bl_description = "Apply or clear this preset of render settings"
    # Enable undo…
    bl_option = {'REGISTER', 'UNDO'}

    presets: EnumProperty(items=(p.rna_enum for p in presets.presets),
                          default=set(),
                          options={'ENUM_FLAG'})

    @staticmethod
    def process_elements(settings, elts):
        setts = []
        val = True
        for sett in settings:
            if sett.strid in elts:
                setts.append(sett)
                val = val and sett.copy
        for e in setts:
            e.copy = not val

    @classmethod
    def poll(cls, context):
        return context.scene is not None

    def execute(self, context):
        cp_sett = context.scene.render_copy_settings
        for p in presets.presets:
            if p.rna_enum[0] in self.presets:
                self.process_elements(cp_sett.affected_settings, p.elements)
        return {'FINISHED'}


# Real interesting stuff…

def do_copy(context, affected_settings, allowed_scenes):
    # Stores render settings from current scene.
    p = {sett: getattr(context.scene.render, sett)
         for sett in affected_settings}
    # put it in all other (valid) scenes’ render settings!
    for scene in bpy.data.scenes:
        # If scene not in allowed scenes, skip.
        if scene.name not in allowed_scenes:
            continue
        # Propagate all affected settings.
        for sett, val in p.items():
            setattr(scene.render, sett, val)


class RenderCopySettingsOPCopy(bpy.types.Operator):
    """Copy render settings from current scene to others"""
    bl_idname = "scene.render_copy_settings"
    bl_label = "Render: Copy Settings"
    # Enable undo…
    bl_option = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.scene is not None

    def execute(self, context):
        regex = None
        cp_sett = context.scene.render_copy_settings
        affected_settings = {sett.strid for sett in cp_sett.affected_settings if sett.copy}
        allowed_scenes = {sce.name for sce in cp_sett.allowed_scenes if sce.allowed}
        do_copy(context, affected_settings=affected_settings, allowed_scenes=allowed_scenes)
        return {'FINISHED'}


classes = (
    RenderCopySettingsOPPrepare,
    RenderCopySettingsOPPreset,
    RenderCopySettingsOPCopy,
)
