from datetime import datetime
from typing import List, Optional
from sqlalchemy import String, Integer, DateTime, Text, Float, ForeignKey, JSON
from sqlalchemy.orm import Mapped, mapped_column, relationship

from .db import Base


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    email: Mapped[str] = mapped_column(String(255), unique=True, index=True, nullable=False)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)


class Voice(Base):
    __tablename__ = "voices"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    vendor: Mapped[str] = mapped_column(String(64), nullable=False)
    gender: Mapped[str] = mapped_column(String(32), nullable=False)
    language: Mapped[str] = mapped_column(String(16), nullable=False)
    description: Mapped[str] = mapped_column(String(255), nullable=False)
    voice_params: Mapped[dict] = mapped_column(JSON, default=dict)


class Assistant(Base):
    __tablename__ = "assistants"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), index=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    call_count: Mapped[int] = mapped_column(Integer, default=0)
    opener: Mapped[str] = mapped_column(Text, default="")
    prompt: Mapped[str] = mapped_column(Text, default="")
    knowledge_base_id: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
    language: Mapped[str] = mapped_column(String(16), default="zh")
    voice: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
    speed: Mapped[float] = mapped_column(Float, default=1.0)
    hotwords: Mapped[dict] = mapped_column(JSON, default=list)
    tools: Mapped[dict] = mapped_column(JSON, default=list)
    interruption_sensitivity: Mapped[int] = mapped_column(Integer, default=500)
    config_mode: Mapped[str] = mapped_column(String(32), default="platform")
    api_url: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
    api_key: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    user = relationship("User")
    call_records = relationship("CallRecord", back_populates="assistant")


class KnowledgeBase(Base):
    __tablename__ = "knowledge_bases"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), index=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str] = mapped_column(Text, default="")
    embedding_model: Mapped[str] = mapped_column(String(64), default="text-embedding-3-small")
    chunk_size: Mapped[int] = mapped_column(Integer, default=500)
    chunk_overlap: Mapped[int] = mapped_column(Integer, default=50)
    doc_count: Mapped[int] = mapped_column(Integer, default=0)
    chunk_count: Mapped[int] = mapped_column(Integer, default=0)
    status: Mapped[str] = mapped_column(String(32), default="active")
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    user = relationship("User")
    documents = relationship("KnowledgeDocument", back_populates="kb")


class KnowledgeDocument(Base):
    __tablename__ = "knowledge_documents"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    kb_id: Mapped[str] = mapped_column(String(64), ForeignKey("knowledge_bases.id"), index=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    size: Mapped[str] = mapped_column(String(64), nullable=False)
    file_type: Mapped[str] = mapped_column(String(32), default="txt")
    storage_url: Mapped[Optional[str]] = mapped_column(String(512), nullable=True)
    status: Mapped[str] = mapped_column(String(32), default="pending")  # pending/processing/completed/failed
    chunk_count: Mapped[int] = mapped_column(Integer, default=0)
    error_message: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    upload_date: Mapped[str] = mapped_column(String(32), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    processed_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)

    kb = relationship("KnowledgeBase", back_populates="documents")


class Workflow(Base):
    __tablename__ = "workflows"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), index=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    node_count: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[str] = mapped_column(String(32), default="")
    updated_at: Mapped[str] = mapped_column(String(32), default="")
    global_prompt: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    nodes: Mapped[dict] = mapped_column(JSON, default=list)
    edges: Mapped[dict] = mapped_column(JSON, default=list)

    user = relationship("User")


class CallRecord(Base):
    __tablename__ = "call_records"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), index=True)
    assistant_id: Mapped[Optional[str]] = mapped_column(String(64), ForeignKey("assistants.id"), index=True)
    source: Mapped[str] = mapped_column(String(32), default="debug")
    status: Mapped[str] = mapped_column(String(32), default="connected")
    started_at: Mapped[str] = mapped_column(String(32), nullable=False)
    ended_at: Mapped[Optional[str]] = mapped_column(String(32), nullable=True)
    duration_seconds: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    summary: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    cost: Mapped[float] = mapped_column(Float, default=0.0)
    call_metadata: Mapped[dict] = mapped_column(JSON, default=dict)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    user = relationship("User")
    assistant = relationship("Assistant", back_populates="call_records")
    transcripts = relationship("CallTranscript", back_populates="call_record")
    audio_segments = relationship("CallAudioSegment", back_populates="call_record")


class CallTranscript(Base):
    __tablename__ = "call_transcripts"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    call_id: Mapped[str] = mapped_column(String(64), ForeignKey("call_records.id"), index=True)
    turn_index: Mapped[int] = mapped_column(Integer, nullable=False)
    speaker: Mapped[str] = mapped_column(String(16), nullable=False)  # human/ai
    content: Mapped[str] = mapped_column(Text, nullable=False)
    confidence: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    start_ms: Mapped[int] = mapped_column(Integer, nullable=False)
    end_ms: Mapped[int] = mapped_column(Integer, nullable=False)
    duration_ms: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    emotion: Mapped[Optional[str]] = mapped_column(String(32), nullable=True)

    call_record = relationship("CallRecord", back_populates="transcripts")


class CallAudioSegment(Base):
    __tablename__ = "call_audio_segments"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    call_id: Mapped[str] = mapped_column(String(64), ForeignKey("call_records.id"), index=True)
    transcript_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("call_transcripts.id"), nullable=True)
    turn_index: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    audio_url: Mapped[str] = mapped_column(String(512), nullable=False)
    audio_format: Mapped[str] = mapped_column(String(16), default="mp3")
    file_size_bytes: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    start_ms: Mapped[int] = mapped_column(Integer, nullable=False)
    end_ms: Mapped[int] = mapped_column(Integer, nullable=False)
    duration_ms: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    call_record = relationship("CallRecord", back_populates="audio_segments")