# BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# END GPL LICENSE BLOCK #####

import pprint
import random
from itertools import chain

import bpy
from bpy.types import Node, NodeTree
from bpy.props import StringProperty, FloatProperty, IntProperty, BoolProperty, CollectionProperty

import sverchok
from sverchok.utils import get_node_class_reference, sv_IO_monad_helpers
from sverchok.utils.sv_IO_panel_tools import create_dict_of_tree, import_tree
from sverchok.utils.logging import info, error
from sverchok.node_tree import SverchCustomTreeNode, SvNodeTreeCommon
from sverchok.data_structure import get_other_socket, updateNode, match_long_repeat
from sverchok.core.update_system import make_tree_from_nodes, do_update
from sverchok.core.monad_properties import SvIntPropertySettingsGroup, SvFloatPropertySettingsGroup


MONAD_COLOR = (0.830819, 0.911391, 0.754562)


socket_types = [
    ("SvStringsSocket", "s", "Numbers, polygon data, generic"),
    ("SvVerticesSocket", "v", "Vertices, point and vector data"),
    ("SvMatrixSocket", "m", "Matrix")
]

reverse_lookup = {'outputs': 'inputs', 'inputs': 'outputs'}



def make_valid_identifier(name):
    """Create a valid python identifier from name for use a a part of class name"""
    while name and not name[0].isalpha():
        name = name[1:]
    if not name:
        return "generic"
    return "".join(ch for ch in name if ch.isalnum() or ch == "_")


def make_new_classname(monad_node_group):
    monad_base_name = make_valid_identifier(monad_node_group.name)
    monad_itentifier = id(monad_node_group) ^ random.randint(0, 4294967296)

    cls_name = "SvGroupNode{}_{}".format(monad_base_name, monad_itentifier)
    return cls_name


def monad_make_unique(node):

    """
    Create a new version of the monad class (duplicate but unique)

    This will attempt to store the duplicate in a json using create_dict_of_tree (from the Gist IO).
    The upside is that this will test the pack/unpack routine continuously. 
    The downside is that this will likely expose all the shortcommings that we don't know 
    about because it wasn't being tested extensively.
    """

    node_tree = node.id_data
    nodes = node_tree.nodes

    # generate a new copy of monad group node. using ( copy? ) 
    monad_group = bpy.data.node_groups[node.monad.name]
    new_monad_group = monad_group.copy()
    new_cls_name = make_new_classname(new_monad_group) 

    # the new tree dict will contain information about 1 node only, and 
    # the node_group too (at the moment) but the node_group data can be ignored.
    layout_json = create_dict_of_tree(ng=node_tree, identified_node=node)

    # do not restore links this way. wipe this entry and restore at a later stage.
    layout_json['update_lists'] = []

    # massage content of node_items, to correspond with the new desired name.
    node_ref = layout_json['nodes'][node.name]
    node_items = node_ref['params']
    node_items['all_props']['name'] = new_monad_group.name
    node_items['all_props']['cls_bl_idname'] = new_cls_name
    node_items['monad'] = new_monad_group.name
    node_items['cls_dict']['cls_bl_idname'] = new_cls_name

    pre_nodes = set(nodes)

    # place new empty version of the monad node
    import_tree(node_tree, nodes_json=layout_json)

    """
    notions..:
    
        if (original instance has no connections) then 
            replace it outright.
        else
            if mode=='replace':
                store connections
                replace instance with new unique instance
                reconnect old connections
            elif mode=='dupe_translate':
                generate unique instance
                attache node to transform operator.


    """

    # return newly generated node!
    return (set(node_tree.nodes) ^ pre_nodes).pop() 



def get_socket_data(socket):
    other = get_other_socket(socket)
    if socket.bl_idname == "SvDummySocket":
        socket = get_other_socket(socket)

    socket_bl_idname = socket.bl_idname
    socket_name = socket.name
    return socket_name, socket_bl_idname, socket.prop_name

def generate_name(prop_name, cls_dict):
    if prop_name in cls_dict:
        # all properties need unique names,
        # if 'x' is taken 'x2' etc.
        for i in range(2, 100):
            new_name = "{}{}".format(prop_name, i)
            if not new_name in cls_dict:
                return new_name
    else:
        return prop_name




class SverchGroupTree(NodeTree, SvNodeTreeCommon):
    ''' Sverchok - groups '''
    bl_idname = 'SverchGroupTreeType'
    bl_label = 'Sverchok Group Node Tree'
    bl_icon = 'NONE'

    # unique and non chaning identifier set upon first creation
    cls_bl_idname: StringProperty()

    float_props: CollectionProperty(type=SvFloatPropertySettingsGroup)
    int_props: CollectionProperty(type=SvIntPropertySettingsGroup)

    def get_current_as_default(self, prop_dict, node, prop_name):
        prop_dict['default'] = getattr(node, prop_name)
        # if not prop_dict['name']:
        #     prop_dict['name'] = node.name + '|' + prop_name


    def add_prop_from(self, socket):
        """
        Add a property if possible
        """
        other = socket.other
        cls = get_node_class_reference(self.cls_bl_idname)
        cls_dict = cls.__dict__ if cls else {}

        if other.prop_name:
            prop_name = other.prop_name

            # prop_func, prop_dict = getattr(other.node.rna_type, prop_name, ("", {}))  # <-- in 2.79
            prop_func, prop_dict = other.node.__annotations__.get(prop_name, ("", {}))

            if prop_func.__name__ == "FloatProperty":
                self.get_current_as_default(prop_dict, other.node, prop_name)
                prop_settings = self.float_props.add()
            elif prop_func.__name__ == "IntProperty":
                self.get_current_as_default(prop_dict, other.node, prop_name)
                prop_settings = self.int_props.add()
            elif prop_func.__name__ == "FloatVectorProperty":
                info("FloatVectorProperty ignored (normal behaviour since day one). prop_func: %s, prop_dict: %s.", prop_func, prop_dict)
                return None # for now etc
            else: # no way to handle it
                return None

            # print('dict')
            # pprint.pprint(prop_dict)
            new_name = generate_name(prop_name, cls_dict)
            prop_settings.prop_name = new_name
            prop_settings.set_settings(prop_dict)
            socket.prop_name = new_name
            return new_name

        elif hasattr(other, "prop_type"):
            if "float" in other.prop_type:
                prop_settings = self.float_props.add()
            elif "int" in other.prop_type:
                prop_settings = self.int_props.add()
            else:
                return None
            
            new_name = generate_name(make_valid_identifier(other.name), cls_dict)
            prop_settings.prop_name = new_name 
            prop_settings.set_settings({"name": other.name})
            socket.prop_name = new_name
            return new_name

        return None

    def get_all_props(self):
        """
        return a dict with all data needed to setup monad
        """
        monad_data  = {"name": self.name, "cls_bl_idname": self.cls_bl_idname}
        float_props = {}
        for prop in self.float_props:
            float_props[prop.prop_name] = prop.get_settings()
        monad_data["float_props"] = float_props

        monad_data["int_props"] = {prop.prop_name: prop.get_settings() for prop in self.int_props}

        return monad_data

    def set_all_props(self, data):

        self.cls_bl_idname = data["cls_bl_idname"]

        for prop_name, values in data["float_props"].items():
            settings = self.float_props.add()
            settings.set_settings(values)
            settings.prop_name = prop_name

        for prop_name, values in data["int_props"].items():
            settings = self.int_props.add()
            settings.set_settings(values)
            settings.prop_name = prop_name



    def remove_prop(self, socket):
        prop_name = socket.prop_name
        for prop_list in ("float_props", "int_props"):
            p_list = getattr(self, prop_list)
            for idx, setting in enumerate(p_list):
                if setting.prop_name == prop_name:
                    p_list.remove(idx)
                    return

    def find_prop(self, socket):
        prop_name = socket.prop_name
        for prop_list in ("float_props", "int_props"):
            p_list = getattr(self, prop_list)
            for setting in p_list:
                if setting.prop_name == prop_name:
                    return setting
        return None

    def verify_props(self):
        '''
        parse sockets and add any props as needed
        for backwarads compablility
        '''
        prop_names = [s.prop_name for s in chain(self.float_props, self.int_props)]
        prop_from_socket = [s.prop_name for s in self.input_node.outputs if s.prop_name]
        if len(prop_names) != len(prop_from_socket):
            pass
            #  here we could do something clever to create things.

        for socket in self.input_node.outputs:
            if socket.is_linked:
                if socket.prop_name:
                    if socket.prop_name in prop_names:
                        continue
                    else:
                        self.add_prop_from(socket)
                        continue

                if socket.other.prop_name:
                    if socket.other.prop_name not in prop_names:
                        self.add_prop_from(socket)
                    else:
                        socket.prop_name = socket.other.prop_name



    def update(self):
        affected_trees = {instance.id_data for instance in self.instances}
        for tree in affected_trees:
            tree.update()

    @classmethod
    def poll(cls, context):
        # keeps us from haivng an selectable icon
        return False

    @property
    def instances(self):
        res = []
        for ng in self.sv_trees:
            for node in ng.nodes:
                if node.bl_idname == self.cls_bl_idname:
                    res.append(node)
                if hasattr(node, "cls_bl_idname") and node.cls_bl_idname == self.cls_bl_idname:
                    res.append(node)
        return res

    @property
    def input_node(self):
        return self.nodes.get("Group Inputs Exp")

    @property
    def output_node(self):
        return self.nodes.get("Group Outputs Exp")

    def update_cls(self):
        """
        create or update the corresponding class reference
        """

        if not all((self.input_node, self.output_node)):
            error("Monad %s not set up correctly", self.name)
            return None

        cls_dict = {}

        if not self.cls_bl_idname:
            
            # the monad cls_bl_idname needs to be unique and cannot change
            monad_base_name = make_valid_identifier(self.name)
            monad_itentifier = id(self) ^ random.randint(0, 4294967296)

            cls_name = "SvGroupNode{}_{}".format(monad_base_name, monad_itentifier)
            # set the unique name for the class, depending on context this might fail
            # then we cannot do the setup of the class properly so abandon
            try:
                self.cls_bl_idname = cls_name
            except Exception:
                return None
        else:
            cls_name = self.cls_bl_idname

        self.verify_props()

        cls_dict["bl_idname"] = cls_name
        cls_dict["bl_label"] = self.name

        cls_dict["input_template"] = self.generate_inputs()
        cls_dict["output_template"] = self.generate_outputs()

        self.make_props(cls_dict)

        # done with setup

        old_cls_ref = get_node_class_reference(cls_name)

        bases = (SvGroupNodeExp, Node, SverchCustomTreeNode)

        cls_ref = type(cls_name, bases, cls_dict)

        if old_cls_ref:
            sverchok.utils.unregister_node_class(old_cls_ref)
        sverchok.utils.register_node_class(cls_ref)

        return cls_ref



    def make_props(self, cls_dict):
        cls_dict['__annotations__'] = {}

        for s in self.float_props:
            prop_dict = s.get_settings()
            prop_dict["update"] = updateNode
            cls_dict['__annotations__'][s.prop_name] = FloatProperty(**prop_dict)

        for s in self.int_props:
            prop_dict = s.get_settings()
            prop_dict["update"] = updateNode
            cls_dict['__annotations__'][s.prop_name] = IntProperty(**prop_dict)


    def generate_inputs(self):
        in_socket = []

        # if socket is dummysocket use the other for data
        for idx, socket in enumerate(self.input_node.outputs):
            if socket.is_linked:
                socket_name, socket_bl_idname, prop_name = get_socket_data(socket)
                if prop_name:
                    prop_data = {"prop_name": prop_name}
                else:
                    prop_data = {}
                data = [socket_name, socket_bl_idname, prop_data]
                in_socket.append(data)

        return in_socket

    def generate_outputs(self):
        out_socket = []
        for socket in self.output_node.inputs:
            if socket.is_linked:
                socket_name, socket_bl_idname, _ = get_socket_data(socket)
                out_socket.append((socket_name, socket_bl_idname))
        return out_socket



def split_list(data, size=1):
    size = max(1, int(size))
    return (data[i:i+size] for i in range(0, len(data), size))

def unwrap(data):
    return list(chain.from_iterable(data))

def uget(self, origin):
    return self[origin]

def uset(self, value, origin):
    MAX = abs(getattr(self, 'loops_max'))
    MIN = 0

    if MIN <= value <= MAX:
        self[origin] = value
    elif value > MAX:
        self[origin] = MAX
    else:
        self[origin] = MIN
    return None


class SvGroupNodeExp:
    """
    Base class for all monad instances
    """
    bl_icon = 'OUTLINER_OB_EMPTY'

    vectorize: BoolProperty(
        name="Vectorize", description="Vectorize using monad",
        default=False, update=updateNode)

    split: BoolProperty(
        name="Split", description="Split inputs into lenght 1",
        default=False, update=updateNode)

    loop_me: BoolProperty(default=False, update=updateNode)
    loops_max: IntProperty(default=5, description='maximum')
    loops: IntProperty(
        name='loop n times', default=0,
        description='change max value in sidebar with variable named loops_max',
        get=lambda s: uget(s, 'loops'),
        set=lambda s, val: uset(s, val, 'loops'),
        update=updateNode)

    def draw_label(self):
        return self.monad.name

    @property
    def monad(self):
        for tree in bpy.data.node_groups:
            if tree.bl_idname == 'SverchGroupTreeType' and self.bl_idname == tree.cls_bl_idname:
               return tree
        return None # or raise LookupError or something, anyway big FAIL

    def sv_init(self, context):
        self['loops'] = 0
        self.use_custom_color = True
        self.color = MONAD_COLOR

        for socket_name, socket_bl_idname, prop_data in self.input_template:
            s = self.inputs.new(socket_bl_idname, socket_name)
            for name, value in prop_data.items():
                setattr(s, name, value)

        for socket_name, socket_bl_idname in self.output_template:
            self.outputs.new(socket_bl_idname, socket_name)


    def update(self):
        ''' Override inherited '''
        pass

    def draw_buttons_ext(self, context, layout):
        self.draw_buttons(context, layout)
        layout.prop(self, 'loops_max')

    def draw_buttons(self, context, layout):

        split = layout.column().split()
        cA = split.column()
        cB = split.column()
        cA.active = not self.loop_me
        cA.prop(self, "vectorize", toggle=True)
        cB.active = self.vectorize
        cB.prop(self, "split", toggle=True)
        
        c2 = layout.column()
        row = c2.row(align=True)
        row.prop(self, "loop_me", text='Loop', toggle=True)
        row.prop(self, "loops", text='N')

        monad = self.monad
        if monad:
            c3 = layout.column()
            c3.prop(monad, "name", text='name')

            d = layout.column()
            d.active = bool(monad)
            if context:
                f = d.operator('node.sv_group_edit', text='edit!')
                f.group_name = monad.name
            else:
                layout.prop(self, 'loops_max')

    def process(self):
        if not self.monad:
            return
        if self.vectorize:
            self.process_vectorize()
            return
        elif self.loop_me:
            self.process_looped(self.loops)
            return

        monad = self.monad
        in_node = monad.input_node
        out_node = monad.output_node

        for index, socket in enumerate(self.inputs):
            data = socket.sv_get(deepcopy=False)
            in_node.outputs[index].sv_set(data)

        #  get update list
        #  could be cached
        ul = make_tree_from_nodes([out_node.name], monad, down=False)
        do_update(ul, monad.nodes)
        # set output sockets correctly
        for index, socket in enumerate(self.outputs):
            if socket.is_linked:
                data = out_node.inputs[index].sv_get(deepcopy=False)
                socket.sv_set(data)

    def process_vectorize(self):
        monad = self.monad
        in_node = monad.input_node
        out_node = monad.output_node
        ul = make_tree_from_nodes([out_node.name], monad, down=False)

        data_out = [[] for s in self.outputs]

        data_in = match_long_repeat([s.sv_get(deepcopy=False) for s in self.inputs])
        if self.split:
            for idx, data in enumerate(data_in):
                new_data = unwrap(split_list(d) for d in data)
                data_in[idx] = new_data
            data_in = match_long_repeat(data_in)

        monad["current_total"] = len(data_in[0])


        for master_idx, data in enumerate(zip(*data_in)):
            for idx, d in enumerate(data):
                socket = in_node.outputs[idx]
                if socket.is_linked:
                    socket.sv_set([d])
            monad["current_index"] = master_idx
            do_update(ul, monad.nodes)
            for idx, s in enumerate(out_node.inputs[:-1]):
                data_out[idx].extend(s.sv_get(deepcopy=False))

        for idx, socket in enumerate(self.outputs):
            if socket.is_linked:
                socket.sv_set(data_out[idx])


    # ----------- loop (iterate 2)

    def do_process(self, sockets_data_in):

        monad = self.monad
        in_node = monad.input_node
        out_node = monad.output_node

        for index, data in enumerate(sockets_data_in):
            in_node.outputs[index].sv_set(data)        


        ul = make_tree_from_nodes([out_node.name], monad, down=False)
        do_update(ul, monad.nodes)

        # set output sockets correctly
        socket_data_out = []
        for index, socket in enumerate(self.outputs):
            if socket.is_linked:
                data = out_node.inputs[index].sv_get(deepcopy=False)
                socket_data_out.append(data)

        return socket_data_out


    def apply_output(self, socket_data):
        for idx, data in enumerate(socket_data):
            self.outputs[idx].sv_set(data)


    def process_looped(self, iterations_remaining):
        sockets_in = [i.sv_get() for i in self.inputs]

        monad = self.monad
        monad['current_total'] = iterations_remaining
        monad['current_index'] = 0

        in_node = monad.input_node
        out_node = monad.output_node

        for iteration in range(iterations_remaining):
            if 'Monad Info' in monad.nodes:
                # info_node = monad.nodes['Monad Info']
                # info_node.outputs[0].sv_set([[iteration]])
                monad["current_index"] = iteration

            sockets_in = self.do_process(sockets_in)
        self.apply_output(sockets_in)


    def load(self):
        pass


def register():
    bpy.utils.register_class(SverchGroupTree)

def unregister():
    bpy.utils.unregister_class(SverchGroupTree)
