from sqlalchemy import Column, Integer, String, DateTime, Unicode, DECIMAL, ForeignKey, Boolean, Enum
from sqlalchemy.orm import relationship
from sqlalchemy.schema import UniqueConstraint
from photoapp.dbutils import Base
from datetime import datetime
import uuid
import enum


class PhotoStatus(enum.Enum):
    private = 0
    public = 1
    hidden = 2


class PhotoSet(Base):
    __tablename__ = 'photos'

    id = Column(Integer, primary_key=True)
    uuid = Column(Unicode, unique=True, default=lambda: str(uuid.uuid4()))
    date = Column(DateTime)
    date_real = Column(DateTime)
    date_offset = Column(Integer, default=0)  # minutes
    lat = Column(DECIMAL(precision=11))
    lon = Column(DECIMAL(precision=11))

    files = relationship("Photo", back_populates="set")
    tags = relationship("TagItem", back_populates="set")

    title = Column(String)
    description = Column(String)
    slug = Column(String)

    status = Column(Enum(PhotoStatus), default=PhotoStatus.private)


class Photo(Base):
    __tablename__ = 'files'

    id = Column(Integer, primary_key=True)
    set_id = Column(Integer, ForeignKey("photos.id"))
    uuid = Column(Unicode, unique=True, default=lambda: str(uuid.uuid4()))

    set = relationship("PhotoSet", back_populates="files", foreign_keys=[set_id])

    size = Column(Integer)
    width = Column(Integer)
    height = Column(Integer)
    orientation = Column(Integer, default=0)
    hash = Column(String(length=64), unique=True)
    path = Column(Unicode)
    format = Column(String(length=64))  # TODO how long can a mime string be


class Tag(Base):
    __tablename__ = 'tags'

    id = Column(Integer, primary_key=True)
    uuid = Column(Unicode, unique=True, default=lambda: str(uuid.uuid4()))
    created = Column(DateTime, default=lambda: datetime.now())
    modified = Column(DateTime, default=lambda: datetime.now())
    is_album = Column(Boolean, default=False)
    # slug-like short name such as "iomtrip"
    name = Column(String, unique=True)
    # longer human-format title like "Isle of Man trip"
    title = Column(String)
    # url slug like "isle-of-man-trip"
    slug = Column(String, unique=True)
    # fulltext description
    description = Column(String)

    entries = relationship("TagItem", back_populates="tag")


class TagItem(Base):
    __tablename__ = 'tag_items'

    id = Column(Integer, primary_key=True)
    tag_id = Column(Integer, ForeignKey("tags.id"))
    set_id = Column(Integer, ForeignKey("photos.id"))
    order = Column(Integer, default=0)

    tag = relationship("Tag", back_populates="entries", foreign_keys=[tag_id])
    set = relationship("PhotoSet", back_populates="tags", foreign_keys=[set_id])

    UniqueConstraint(tag_id, set_id)


class UserStatus(enum.Enum):
    banned = -1
    guest = 0
    normal = 1
    admin = 2


class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    name = Column(String(length=64), unique=True)
    password = Column(String(length=64))  # sha256
    status = Column(Enum(UserStatus), default=UserStatus.normal)