import os
from collections import defaultdict

from sphinx.util.console import bold, darkgreen
from sphinx.util.osutil import ensuredir

from ..base import AutoAPIBase, AutoAPIDomain
from ..settings import env


class DotNetDomain(AutoAPIDomain):
    '''Auto API domain handler for .NET

    Searches for YAML files, and soon to be JSON files as well, for auto API
    sources

    :param app: Sphinx application passed in as part of the extension
    '''

    def find_files(self):
        '''Find YAML/JSON files to parse for namespace information'''
        # TODO do an intelligent glob here, we're picking up too much
        files_to_read = os.listdir(self.get_config('autoapi_dir'))
        for _path in self.app.status_iterator(
                files_to_read,
                '[AutoAPI] Reading files... ',
                darkgreen,
                len(files_to_read)):
            yield _path

    def create_class(self, data):
        '''Return instance of class based on Roslyn type property

        Data keys handled here:

            type
                Set the object class

            items
                Recurse into :py:meth:`create_class` to create child object
                instances

        :param data: dictionary data from Roslyn output artifact
        '''
        # TODO replace this with a global mapping
        classes = [DotNetNamespace, DotNetClass, DotNetProperty, DotNetMethod,
                   DotNetEnum, DotNetConstructor, DotNetStruct, DotNetInterface,
                   DotNetDelegate, DotNetField, DotNetEvent]
        obj = None
        for cls in classes:
            if data['type'].lower() == cls.type.lower():
                obj = cls(data)

        # Append child objects
        # TODO this should recurse in the case we're getting back more complex
        # argument listings
        if 'items' in data:
            obj.children = []
            obj.item_map = defaultdict(list)
            for item in data['items']:
                child_obj = self.create_class(item)
                obj.children.append(child_obj)
                obj.item_map[item['type']].append(child_obj)

        return obj

    def get_objects(self):
        '''Trigger find of serialized sources and build objects'''
        for path in self.find_files():
            data = self.read_file(os.path.join(self.get_config('autoapi_dir'), path))
            obj = self.create_class(data)
            self.add_object(obj)

    def add_object(self, obj):
        '''Add object to local and app environment storage

        :param obj: Instance of a .NET object
        '''
        self.app.env.autoapi_data.append(obj)
        self.objects.append(obj)

    def sort_objects(self):
        '''Not implemented yet'''
        pass
        # print "Sorting objects"
        # Sort objects
        # for obj in app.env.autoapi_data:
            # rst = parse(obj, 'dotnet')
            # if rst:
            #     path = os.path.join(app.config.autoapi_root, '%s%s' % (obj['name']['CSharp'], app.config.source_suffix[0]))
            #     ensuredir(app.config.autoapi_root)
            #     with open(path, 'w+') as fp:
            #         fp.write(rst)

    def organize_objects(self):
        '''Organize objects and namespaces'''

        def _recurse_ns(obj):
            namespace = obj.namespace()
            if namespace is not None:
                ns_obj = None
                for (n, search_obj) in enumerate(self.app.env.autoapi_data):
                    if (search_obj.id == namespace and
                            isinstance(search_obj, DotNetNamespace)):
                        ns_obj = self.app.env.autoapi_data[n]
                if ns_obj is None:
                    ns_obj = self.create_class({'id': namespace,
                                                'type': 'namespace'})
                    self.app.env.autoapi_data.append(ns_obj)
                    self.namespaces[ns_obj.id] = ns_obj
                if obj not in ns_obj.children:
                    ns_obj.children.append(obj)
                _recurse_ns(ns_obj)

        for obj in self.app.env.autoapi_data:
            _recurse_ns(obj)

    def full(self):
        print "Reading"
        self.get_objects()
        self.organize_objects()
        print "Writing"
        self.generate_output()
        self.write_indexes()

    def generate_output(self):
        # for namespace, objs in namespaces.items():
        for obj in self.app.env.autoapi_data:
            # path = os.path.join(app.config.autoapi_root, '%s%s' % (namespace, app.config.source_suffix[0]))
            # namespace_obj = DotNetNamespace(namespace, objs)
            # ensuredir(app.config.autoapi_root)
            # with open(path, 'w+') as index_file:
            #     namespace_rst = namespace_obj.render()
            #     if namespace_rst:
            #         index_file.write(namespace_rst)
            # for obj in objs:

            # TODO not here!
            obj.item_map = defaultdict(list)
            for child in obj.children:
                obj.item_map[child.type].append(child)

            rst = obj.render()
            # Detail
            detail_dir = os.path.join(self.get_config('autoapi_root'),
                                      *obj.name.split('.'))
            ensuredir(detail_dir)
            path = os.path.join(detail_dir, '%s%s' % ('index', self.get_config('source_suffix')[0]))
            if rst:
                with open(path, 'w+') as detail_file:
                    detail_file.write(rst)

        for namespace, obj in self.namespaces.items():
            path = os.path.join(self.get_config('autoapi_root'), '%s%s' % (namespace, self.get_config('source_suffix')[0]))
            ensuredir(self.get_config('autoapi_root'))
            with open(path, 'w+') as index_file:
                namespace_rst = obj.render()
                if namespace_rst:
                    index_file.write(namespace_rst)

    def write_indexes(self):
        # Write Index
        top_level_index = os.path.join(self.get_config('autoapi_root'),
                                       'index.rst')
        with open(top_level_index, 'w+') as top_level_file:
            content = env.get_template('index.rst')
            top_level_file.write(content.render())


class DotNetBase(AutoAPIBase):
    '''Base .NET object representation'''

    language = 'dotnet'

    def __init__(self, obj):
        super(DotNetBase, self).__init__(obj)
        # Always exist
        self.id = obj['id']
        self.type = obj['type']
        # Use name or id
        try:
            self.name = obj['qualifiedName']['CSharp']
        except:
            self.name = self.id
        self.short_name = self.name.split('.')[-1]

        # Optional
        self.summary = obj.get('summary', '')
        self.parameters = []
        self.items = []
        self.children = []

        # Syntax example and parameter list
        syntax = obj.get('syntax', None)
        self.example = ''
        if syntax is not None:
            # Code example
            try:
                self.example = syntax['content']['CSharp']
            except KeyError:
                pass

            self.parameters = []
            for param in syntax.get('parameters', []):
                if 'id' in param:
                    self.parameters.append({
                        'name': param.get('id'),
                        'type': param.get('type', {}).get('id', None),
                        'desc': param.get('description', '')
                    })

        self.items = obj.get('items', [])

    def __str__(self):
        return '<{cls} {id}>'.format(cls=self.__class__.__name__,
                                     id=self.id)

    def namespace(self):
        pieces = self.id.split('.')[:-1]
        if pieces:
            return '.'.join(pieces)

    @property
    def ref_type(self):
        return self.type.lower().replace('class', 'cls').replace('interface', 'iface').replace('delegate', 'del')

    def to_ref_type(self, _type):
        return _type.lower().replace('class', 'cls').replace('interface', 'iface').replace('delegate', 'del')


class DotNetNamespace(DotNetBase):
    type = 'namespace'
    reftype = 'ns'


class DotNetMethod(DotNetBase):
    type = 'method'
    reftype = 'meth'


class DotNetProperty(DotNetBase):
    type = 'property'
    reftype = 'prop'


class DotNetEnum(DotNetBase):
    type = 'enum'
    reftype = 'enum'


class DotNetStruct(DotNetBase):
    type = 'struct'
    reftype = 'struct'


class DotNetConstructor(DotNetBase):
    type = 'constructor'
    reftype = 'ctor'


class DotNetInterface(DotNetBase):
    type = 'interface'
    reftype = 'iface'


class DotNetDelegate(DotNetBase):
    type = 'delegate'
    reftype = 'del'


class DotNetClass(DotNetBase):
    type = 'class'
    reftype = 'cls'


class DotNetField(DotNetBase):
    type = 'field'
    reftype = 'field'


class DotNetEvent(DotNetBase):
    type = 'event'
    reftype = 'event'


class DotNetVirtualNamespace(AutoAPIBase):
    language = 'dotnet'
    type = 'namespace'
    reftype = 'ns'

    def __init__(self, name, objs):
        self.name = self.short_name = name
        self.children = []
        self.type = 'namespace'
        for obj in objs:
            self.children.append(obj.obj)