# -*- coding: utf-8 -*-
###############################################################################
# ScribeEngine - Open Source Content Management System                        #
# --------------------------------------------------------------------------- #
# Copyright (c) 2010-2021 Raoul Snyman                                        #
# --------------------------------------------------------------------------- #
# This file is part of ScribeEngine.                                          #
#                                                                             #
# ScribeEngine 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 3 of the License, or (at your option)   #
# any later version.                                                          #
#                                                                             #
# ScribeEngine 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.                                                               #
#                                                                             #
# You should have received a copy of the GNU General Public License along     #
# with ScribeEngine.  If not, see <https://www.gnu.org/licenses/>.            #
###############################################################################
"""
The :mod:`~scribeengine.models` module contains all the database models
"""
from datetime import datetime

from box import Box
from flask_user import UserMixin

from scribeengine.db import Model, Table, Column, ForeignKey, String, Text, Integer, Boolean, DateTime, \
    backref, inspect, relationship


permissions_roles = Table(
    'permissions_roles',
    Column('permission_id', Integer, ForeignKey('permissions.id'), primary_key=True),
    Column('role_id', Integer, ForeignKey('roles.id'), primary_key=True)
)


nodes_taxonomies = Table(
    'nodes_terms',
    Column('node_id', Integer, ForeignKey('nod.id'), primary_key=True),
    Column('taxonomy_id', Integer, ForeignKey('taxonomy.id'), primary_key=True)
)


roles_users = Table(
    'roles_users',
    Column('user_id', Integer, ForeignKey('users.id'), primary_key=True),
    Column('role_id', Integer, ForeignKey('roles.id'), primary_key=True)
)


class DictMixin(object):
    """
    A mixin class to add a "to_dict" method to each model
    """
    def to_dict(self):
        return Box({c.key: getattr(self, c.key) for c in inspect(self).mapper.column_attrs})


class Taxonomy(Model, DictMixin):
    """
    This is a grouping of related terms, like a tags or categories
    """
    __tablename__ = 'taxonomies'

    id = Column(Integer, primary_key=True)
    name = Column(String(100), nullable=False)
    description = Column(Text)
    slug = Column(String(255), nullable=False, index=True, unique=True)

    def __str__(self):
        return self.name


class Node(Model, DictMixin):
    """
    Nodes are the basic content type
    """
    __tablename__ = 'nodes'

    id = Column(Integer, primary_key=True)
    slug = Column(String(255), nullable=False, index=True, unique=True)
    type = Column(String(255), nullable=False, index=True)
    created = Column(DateTime, nullable=False, default=datetime.utcnow)
    modified = Column(DateTime, nullable=False, default=datetime.utcnow)
    revision_id = Column(Integer, ForeignKey('revisions.id'), nullable=False, index=True)

    current_revision = relationship('Revision', backref='node')

    @property
    def complete(self):
        """Return a "full" or "complete" node, with all fields and data"""
        node_dict = self.to_dict()
        for field in self.fields:
            node_dict[field.name] = Box({
                'name': field.name,
                'type': field.type,
                'title': field.field.title,
                'data': field.data
            })
        return node_dict


class Field(Model, DictMixin):
    """
    A field is a model for field types on nodes
    """
    __tablename__ = 'fields'

    id = Column(Integer, primary_key=True)
    name = Column(String(255), nullable=False, unique=True, index=True)
    type = Column(String(255), nullable=False)
    title = Column(String(255), nullable=False)
    description = Column(Text)
    created = Column(DateTime, nullable=False, default=datetime.utcnow)
    modified = Column(DateTime, nullable=False, default=datetime.utcnow)


class FieldRevision(Model, DictMixin):
    """
    A revision of a field on a node
    """
    __tablename__ = 'field_revisions'

    id = Column(Integer, primary_key=True)
    version = Column(Integer, nullable=False)
    title = Column(String(255), nullable=False)
    body = Column(Text)
    format = Column(Text, nullable=False)
    slug = Column(String(255), nullable=False)
    created = Column(DateTime, nullable=False, index=True, default=datetime.utcnow)
    node_id = Column(Integer, ForeignKey('nodes.id'), nullable=False)


class NodeField(Model, DictMixin):
    """
    A node field is a field on a particular node
    """
    __tablename__ = 'node_fields'

    id = Column(Integer, primary_key=True)
    field_id = Column(Integer, ForeignKey('fields.id'))
    node_id = Column(Integer, ForeignKey('nodes.id'))
    revision_id = Column(Integer, ForeignKey('field_revisions.id'), nullable=False, index=True)
    title = Column(String(255), nullable=False)
    description = Column(Text)
    created = Column(DateTime, nullable=False, default=datetime.utcnow)
    modified = Column(DateTime, nullable=False, default=datetime.utcnow)

    current_revision = relationship('FieldRevision', backref='node_field')
    field = relationship('Field', backref='node_field')


class File(Model, DictMixin):
    """
    A file in the media library.
    """
    __tablename__ = 'files'

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
    media_type_id = Column(Integer, ForeignKey('media_types.id'), nullable=False)
    filename = Column(String(255), nullable=False, index=True)
    mimetype = Column(String(255))
    path = Column(String(255))
    size = Column(Integer, default=0)

    def __str__(self):
        return self.filename


class MediaType(Model, DictMixin):
    """
    Distinguishes between different types of media.
    """
    __tablename__ = 'media_types'

    id = Column(Integer, primary_key=True)
    title = Column(String(255), nullable=False, index=True)

    files = relationship('File', backref='media_type')

    def __str__(self):
        return self.title


class Permission(Model, DictMixin):
    """
    A single permission.
    """
    __tablename__ = 'permissions'

    id = Column(Integer, primary_key=True)
    name = Column(String(80), nullable=False, index=True)
    description = Column(Text)

    def __str__(self):
        return self.name


class Role(Model, DictMixin):
    """
    A role defines a set of permissions.
    """
    __tablename__ = 'roles'

    id = Column(Integer, primary_key=True)
    name = Column(String(80), nullable=False, index=True)
    description = Column(Text)

    permissions = relationship('Permission', backref='roles', secondary=permissions_roles)

    def __str__(self):
        return self.name


class Term(Model, DictMixin):
    """
    A term is an item in a taxonomy. A term can be a category name, or a tag in a blog post.
    """
    __tablename__ = 'terms'

    id = Column(Integer, primary_key=True)
    name = Column(String(100), nullable=False)
    slug = Column(String(255), nullable=False, index=True)
    taxonomy_id = Column(Integer, ForeignKey('taxonomies.id'))

    def __str__(self):
        return self.name


class User(Model, UserMixin, DictMixin):
    """
    The user.
    """
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    email = Column(String(200), nullable=False, unique=True, index=True)
    username = Column(String(200), nullable=False, unique=True, index=True)
    password = Column(String(64), nullable=False)
    nick = Column(String(50), nullable=False, index=True)
    first_name = Column(String(100), default='')
    last_name = Column(String(100), default='')
    homepage = Column(String(200), default='')
    timezone = Column(String(200), default='UTC')
    activation_key = Column(String(40), default=None)
    confirmed_at = Column(DateTime)
    active = Column('is_active', Boolean, nullable=False, server_default='0')

    comments = relationship('Comment', backref='user')
    files = relationship('File', backref='user')
    posts = relationship('Post', backref='author')
    roles = relationship('Role', backref='users', secondary=roles_users)

    def has_permission(self, permission):
        if isinstance(permission, str):
            for role in self.roles:
                for perm in role.permissions:
                    if perm.name == permission:
                        return True
            return False
        elif isinstance(permission, Permission):
            for role in self.roles:
                for perm in role.permissions:
                    if perm == permission:
                        return True
            return False
        elif isinstance(permission, list):
            for role in self.roles:
                for perm in role.permissions:
                    if perm.name in permission:
                        return True
            return False
        else:
            return False

    def __str__(self):
        return str(id(self))


class Variable(Model, DictMixin):
    """
    System variables.
    """
    __tablename__ = 'variables'

    key = Column(String, primary_key=True, index=True)
    value = Column(Text, nullable=False)
    type = Column(String, default='string')


class Site(object):
    """
    Generic model to hold the site-specfic data
    """
    name = None
    slogan = None
    about = None

    def __init__(self, name, slogan=None, about=None):
        self.name = name
        self.slogan = slogan
        self.about = about


class Menu(Model, DictMixin):
    """
    A menu
    """
    __tablename__ = 'menus'

    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)
    description = Column(Text)
    block = Column(String)

    items = relationship('MenuItem', backref='menu')


class MenuItem(Model, DictMixin):
    """
    A menu item
    """
    __tablename__ = 'menu_items'

    id = Column(Integer, primary_key=True)
    title = Column(String, nullable=False)
    url = Column(String, nullable=False)
    weight = Column(Integer, default=0)
    menu_id = Column(Integer, ForeignKey('menus.id'))
    parent_id = Column(Integer, ForeignKey('menu_items.id'))

    items = relationship('MenuItem', backref=backref('parent', remote_side=[id]))