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from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, Float, Integer, String, Text
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class Candidate(Base):
    __tablename__ = "candidates"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    external_id: Mapped[str] = mapped_column(String(64), unique=True, index=True)

    full_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    email: Mapped[str | None] = mapped_column(String(255), nullable=True)
    phone: Mapped[str | None] = mapped_column(String(64), nullable=True)
    location: Mapped[str | None] = mapped_column(String(255), nullable=True)

    years_experience: Mapped[float | None] = mapped_column(Float, nullable=True)
    skills_csv: Mapped[str | None] = mapped_column(Text, nullable=True)

    summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    source_resume_key: Mapped[str | None] = mapped_column(String(512), nullable=True)
    source_resume_url: Mapped[str | None] = mapped_column(String(1024), nullable=True)

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow,
    )


class QueryAudit(Base):
    __tablename__ = "query_audit"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    session_id: Mapped[str] = mapped_column(String(128), index=True)
    query: Mapped[str] = mapped_column(Text)
    top_k: Mapped[int] = mapped_column(Integer, default=5)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)


class ApplicationStatus(Base):
    __tablename__ = "application_status"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    candidate_id: Mapped[str] = mapped_column(String(64), index=True)
    candidate_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    role_applied: Mapped[str | None] = mapped_column(String(255), nullable=True)
    stage: Mapped[str] = mapped_column(String(128), default="Applied")
    status: Mapped[str] = mapped_column(String(128), default="Open")
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow,
    )


class InterviewRecord(Base):
    __tablename__ = "interview_records"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    candidate_id: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
    candidate_name: Mapped[str] = mapped_column(String(255))
    candidate_email: Mapped[str] = mapped_column(String(255), index=True)

    interviewer_name: Mapped[str] = mapped_column(String(255))
    interviewer_email: Mapped[str] = mapped_column(String(255), index=True)
    interview_round: Mapped[str] = mapped_column(String(128), default="Screening")

    scheduled_on: Mapped[datetime] = mapped_column(DateTime)
    end_time: Mapped[datetime] = mapped_column(DateTime)
    duration_minutes: Mapped[int] = mapped_column(Integer, default=60)

    meeting_link: Mapped[str | None] = mapped_column(String(1024), nullable=True)
    status: Mapped[str] = mapped_column(String(64), default="Scheduled")
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow,
    )