from pgvector.sqlalchemy import Vector
from sqlalchemy import (
    JSON,
    Boolean,
    Column,
    DateTime,
    Float,
    ForeignKey,
    Integer,
    String,
    Text,
)
from sqlalchemy.orm import relationship
from sqlalchemy.dialects.postgresql import TSVECTOR as TSVector

from app.core.db import Base, utc_now

pgvector_type = Vector(1536)


class MemorySource(Base):
    __tablename__ = "memory_sources"
    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    source_type = Column(String, nullable=False)  # transcript / note / draft
    raw_text = Column(Text, nullable=True)
    storage_key = Column(String, nullable=True)
    speaker = Column(String, nullable=True)
    captured_at = Column(DateTime(timezone=True), nullable=True)
    status = Column(String, default="active")
    conversation_id = Column(String, ForeignKey("conversations.id"), nullable=True)
    created_at = Column(DateTime(timezone=True), default=utc_now)
    chunks = relationship(
        "MemoryChunk", back_populates="source", cascade="all, delete-orphan"
    )


class MemoryChunk(Base):
    __tablename__ = "memory_chunks"
    id = Column(String, primary_key=True)
    source_id = Column(
        String, ForeignKey("memory_sources.id"), nullable=False, index=True
    )
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    content = Column(Text, nullable=False)
    # pgvector embedding — Alembic migration 负责 CREATE EXTENSION vector 及列类型
    embedding = Column(pgvector_type, nullable=True)
    # PostgreSQL FTS — Alembic migration 负责 generated tsvector 列 + GIN index
    content_tsv = Column(TSVector, nullable=True)
    chunk_index = Column(Integer, nullable=False)
    speaker = Column(String, nullable=True)
    event_year = Column(Integer, nullable=True)
    metadata_json = Column(JSON, nullable=True)
    is_excluded = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), default=utc_now)
    source = relationship("MemorySource", back_populates="chunks")


class MemorySummary(Base):
    __tablename__ = "memory_summaries"
    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    summary_type = Column(String, nullable=False)  # session / rolling / topic
    content = Column(Text, nullable=False)
    source_chunk_ids = Column(JSON, nullable=True)
    created_at = Column(DateTime(timezone=True), default=utc_now)
    updated_at = Column(DateTime(timezone=True), default=utc_now, onupdate=utc_now)


class MemoryFact(Base):
    __tablename__ = "memory_facts"
    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    fact_type = Column(
        String, nullable=False
    )  # person / event / relation / place / milestone
    subject = Column(String, nullable=True)
    predicate = Column(String, nullable=True)
    object_json = Column(JSON, nullable=True)
    confidence = Column(Float, default=0.0)
    source_chunk_id = Column(String, ForeignKey("memory_chunks.id"), nullable=True)
    status = Column(String, default="candidate")  # candidate / confirmed / rejected
    created_at = Column(DateTime(timezone=True), default=utc_now)


class TimelineEvent(Base):
    __tablename__ = "timeline_events"
    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    event_year = Column(Integer, nullable=True)
    event_date = Column(String, nullable=True)
    title = Column(String, nullable=False)
    description = Column(Text, nullable=True)
    person_refs = Column(JSON, nullable=True)
    source_fact_ids = Column(JSON, nullable=True)
    created_at = Column(DateTime(timezone=True), default=utc_now)


class MemoryCurationAction(Base):
    __tablename__ = "memory_curation_actions"
    id = Column(String, primary_key=True)
    user_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
    action_type = Column(
        String, nullable=False
    )  # exclude / restore / correct / merge / confirm / reject
    target_type = Column(
        String, nullable=False
    )  # chunk / fact / summary / timeline_event
    target_id = Column(String, nullable=False)
    details = Column(JSON, nullable=True)
    created_at = Column(DateTime(timezone=True), default=utc_now)