import json

import bmesh
import bpy
from bpy_extras.io_utils import ExportHelper
from bpy.props import StringProperty, BoolProperty, FloatVectorProperty
from bpy_extras import object_utils


class SMBDumpMesh(bpy.types.Operator, ExportHelper):
    '''dump mesh info into .json file for smbsurf'''
    bl_idname = 'object.dump_mesh'
    bl_label = 'Dump Mesh'
    filename_ext = ".json"

    filter_glob = StringProperty(
        default="*.json",
        options={'HIDDEN'},
    )

    @classmethod
    def poll(cls, context):
        if context.active_object.type == 'MESH':
            return context.active_object
        else:
            return None

    def execute(self, context):
        if context.object.mode == 'OBJECT':
            bpy.ops.object.mode_set(mode='EDIT')

        m = context.object.data
        b = bmesh.from_edit_mesh(m)

        data = {}
        data['vertices'] = [list(vert.co) for vert in b.verts]

        data['edges for vert'] = []
        for vert in b.verts:
            data['edges for vert'].append([e.index for e in vert.link_edges])
        data['faces for vert'] = []
        for vert in b.verts:
            data['faces for vert'].append([e.index for e in vert.link_faces])

        edges = []
        for edge in b.edges:
            edges.append([v.index for v in edge.verts])
        data['edges'] = edges

        data['faces for edge'] = []
        for edge in b.edges:
            data['faces for edge'].append([f.index for f in edge.link_faces])

        faces = []
        for face in b.faces:
            faces.append([v.index for v in face.verts])
        data['faces'] = faces

        data['edges for face'] = []
        for face in b.faces:
            data['edges for face'].append([e.index for e in face.edges])

        json.dump(data, open(self.filepath, 'w'))
        bpy.ops.object.mode_set(mode='OBJECT')
        return {'FINISHED'}


class SMBLoadMesh(bpy.types.Operator, ExportHelper):
    '''load json mesh from smbsurf'''
    bl_idname = 'object.load_mesh'
    bl_label = 'Load Mesh'
    filename_ext = ".json"

    filter_glob = StringProperty(
        default="*.json",
        options={'HIDDEN'},
    )

    # generic transform props
    view_align = BoolProperty(
        name="Align to View",
        default=False,
    )
    location = FloatVectorProperty(
        name="Location",
        subtype='TRANSLATION',
    )
    rotation = FloatVectorProperty(
        name="Rotation",
        subtype='EULER',
    )

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

    def execute(self, context):
        data = json.load(open(self.filepath, 'r'))
        mesh = bpy.data.meshes.new("Imported")

        bm = bmesh.new()

        for v_co in data['vertices']:
            bm.verts.new(v_co)

        for f_idx in data['faces']:
            bm.faces.new([bm.verts[i] for i in f_idx])

        bm.to_mesh(mesh)
        mesh.update()

        # add the mesh as an object into the scene with this utility module
        try:
            object_utils.object_data_add(context, mesh, operator=self)
        except:
            pass
        return {'FINISHED'}


class SMBPanel(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'TOOLS'
    bl_idname = "VIEW3D_PT_TEST_PANEL"
    bl_label = "smbsurf"

    def draw(self, context):
        self.layout.operator('object.dump_mesh', icon='EXPORT')
        self.layout.operator('object.load_mesh', icon='IMPORT')

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


def register():
    bpy.utils.register_class(SMBDumpMesh)
    bpy.utils.register_class(SMBLoadMesh)
    bpy.utils.register_class(SMBPanel)


def unregister():
    bpy.utils.unregister_class(SMBDumpMesh)
    bpy.utils.unregister_class(SMBLoadMesh)
    bpy.utils.unregister_class(SMBPanel)