from datetime import datetime
from sqlalchemy import (
    Boolean, Column, DateTime, Float, ForeignKey,
    Integer, String, Text, UniqueConstraint,
)
from .database import Base


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, nullable=False, index=True)
    email = Column(String, unique=True, nullable=False, index=True)
    hashed_password = Column(String, nullable=False)
    is_admin = Column(Boolean, default=False)
    created_at = Column(DateTime, default=datetime.utcnow)


class Channel(Base):
    __tablename__ = "channels"

    id = Column(Integer, primary_key=True, index=True)
    youtube_channel_id = Column(String, unique=True, nullable=False, index=True)
    name = Column(String, nullable=False)
    description = Column(Text)
    thumbnail_url = Column(String)
    banner_url = Column(String)
    crawled_at = Column(DateTime)
    subscriber_count = Column(Integer)


class UserChannel(Base):
    __tablename__ = "user_channels"
    __table_args__ = (UniqueConstraint("user_id", "channel_id"),)

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    channel_id = Column(Integer, ForeignKey("channels.id", ondelete="CASCADE"), nullable=False)
    status = Column(String, default="followed")  # followed / dismissed / pending
    added_at = Column(DateTime, default=datetime.utcnow)
    auto_download = Column(Boolean, default=None)  # None = use global, True/False = override
    last_seen_at = Column(DateTime, default=None)
    muted_until = Column(DateTime, default=None)
    notes = Column(Text, default="")


class Video(Base):
    __tablename__ = "videos"

    id = Column(Integer, primary_key=True, index=True)
    youtube_video_id = Column(String, unique=True, nullable=False, index=True)
    channel_id = Column(Integer, ForeignKey("channels.id", ondelete="SET NULL"), nullable=True)
    title = Column(String, nullable=False)
    description = Column(Text)
    thumbnail_url = Column(String)
    duration_seconds = Column(Integer)
    published_at = Column(DateTime)
    indexed_at = Column(DateTime, default=datetime.utcnow)
    tags = Column(Text)      # JSON array string
    category = Column(String)
    chapters = Column(Text)  # JSON array of {start_time, end_time, title}


class UserVideo(Base):
    __tablename__ = "user_videos"
    __table_args__ = (UniqueConstraint("user_id", "video_id"),)

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
    watched = Column(Boolean, default=False)
    watch_progress_seconds = Column(Integer, default=0)
    completion_percent = Column(Float, default=None)   # 0–100, set when video ends/navigates away
    rewatch_count = Column(Integer, default=0)         # incremented each time a completed video is replayed
    queued = Column(Boolean, default=False)
    downloaded = Column(Boolean, default=False)
    liked = Column(Boolean, default=False)
    rating = Column(Integer, default=None)  # NULL=unrated, 1=thumbs up, -1=thumbs down
    downloaded_at = Column(DateTime)
    liked_at = Column(DateTime)
    last_watched_at = Column(DateTime)


class Download(Base):
    __tablename__ = "downloads"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
    status = Column(String, default="pending")  # pending / downloading / complete / failed
    progress_percent = Column(Float, default=0.0)
    file_path = Column(String)
    resolution = Column(String)  # e.g. "1080p", "720p"
    created_at = Column(DateTime, default=datetime.utcnow)
    completed_at = Column(DateTime)
    error_message = Column(Text)
    pending_delete_at = Column(DateTime, default=None)


class UserSettings(Base):
    __tablename__ = "user_settings"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, unique=True)
    preferred_quality = Column(String, default="best")       # best / 1080p / 720p / 480p / 360p
    max_concurrent_downloads = Column(Integer, default=3)    # 1–5
    hide_watched_from_feed = Column(Boolean, default=False)
    mark_watched_at_percent = Column(Integer, default=90)    # 50–100
    auto_download_on_sync = Column(Boolean, default=False)
    cookies_browser = Column(String, default="")             # chrome / firefox / etc., "" = disabled
    theater_mode = Column(Boolean, default=False)
    discovery_regions = Column(String, default="US,SE")      # comma-separated ISO country codes
    calm_mode = Column(Boolean, default=False)
    hide_subscriber_counts = Column(Boolean, default=False)
    autoplay_enabled = Column(Boolean, default=False)
    feed_weight_recency = Column(Float, default=5.0)   # 0–10
    feed_weight_affinity = Column(Float, default=5.0)  # 0–10
    feed_weight_channel = Column(Float, default=5.0)   # 0–10


class DiscoveryQueue(Base):
    __tablename__ = "discovery_queue"
    __table_args__ = (UniqueConstraint("user_id", "channel_id"),)

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    channel_id = Column(Integer, ForeignKey("channels.id", ondelete="CASCADE"), nullable=False)
    score = Column(Float, default=0.0)
    source = Column(String)  # search / community / category / liked
    seen = Column(Boolean, default=False)
    preview_json = Column(Text)  # JSON: [{thumbnail_url, title}, ...]
    created_at = Column(DateTime, default=datetime.utcnow)


class ChannelGroup(Base):
    __tablename__ = "channel_groups"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)


class ChannelGroupMember(Base):
    __tablename__ = "channel_group_members"
    __table_args__ = (UniqueConstraint("group_id", "channel_id"),)

    id = Column(Integer, primary_key=True, index=True)
    group_id = Column(Integer, ForeignKey("channel_groups.id", ondelete="CASCADE"), nullable=False)
    channel_id = Column(Integer, ForeignKey("channels.id", ondelete="CASCADE"), nullable=False)


class UserTagAffinity(Base):
    """Per-user taste signal: how much the user engages with a given tag or category."""
    __tablename__ = "user_tag_affinity"
    __table_args__ = (UniqueConstraint("user_id", "tag"),)

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    tag = Column(String, nullable=False, index=True)
    score = Column(Float, default=0.0)
    updated_at = Column(DateTime, default=datetime.utcnow)


class Collection(Base):
    __tablename__ = "collections"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)


class CollectionItem(Base):
    __tablename__ = "collection_items"
    __table_args__ = (UniqueConstraint("collection_id", "video_id"),)

    id = Column(Integer, primary_key=True, index=True)
    collection_id = Column(Integer, ForeignKey("collections.id", ondelete="CASCADE"), nullable=False)
    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
    added_at = Column(DateTime, default=datetime.utcnow)


class GraphEdge(Base):
    __tablename__ = "graph_edges"
    __table_args__ = (UniqueConstraint("from_channel_id", "to_channel_id"),)

    id = Column(Integer, primary_key=True, index=True)
    from_channel_id = Column(Integer, ForeignKey("channels.id", ondelete="CASCADE"), nullable=False)
    to_channel_id = Column(Integer, ForeignKey("channels.id", ondelete="CASCADE"), nullable=False)
    mention_count = Column(Integer, default=1)
    last_seen = Column(DateTime, default=datetime.utcnow)


class SystemConfig(Base):
    __tablename__ = "system_config"

    key = Column(String, primary_key=True)
    value = Column(String, nullable=False)


class SearchHistory(Base):
    __tablename__ = "search_history"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    query = Column(String, nullable=False)
    searched_at = Column(DateTime, default=datetime.utcnow)


class VideoBookmark(Base):
    __tablename__ = "video_bookmarks"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
    timestamp_seconds = Column(Integer, nullable=False)
    note = Column(Text, default="")
    source = Column(String, default="manual")  # manual | auto
    created_at = Column(DateTime, default=datetime.utcnow)