from datetime import datetime, timezone
from sqlalchemy import String, Text, Integer, DateTime, ForeignKey, JSON
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


def utcnow() -> datetime:
    return datetime.now(timezone.utc)


class Submission(Base):
    __tablename__ = "submissions"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    problem_id: Mapped[int] = mapped_column(ForeignKey("problems.id", ondelete="CASCADE"), nullable=False)
    contest_id: Mapped[int] = mapped_column(ForeignKey("contests.id", ondelete="CASCADE"), nullable=False)
    source_code: Mapped[str] = mapped_column(Text, nullable=False)
    language_id: Mapped[int] = mapped_column(Integer, nullable=False)  # Judge0 language ID
    language_name: Mapped[str | None] = mapped_column(String(50), nullable=True)
    status: Mapped[str] = mapped_column(String(50), default="pending")  # pending, judging, accepted, wrong_answer, etc.
    score: Mapped[int] = mapped_column(Integer, default=0)
    total_points: Mapped[int] = mapped_column(Integer, default=0)
    tests_passed: Mapped[int] = mapped_column(Integer, default=0)
    tests_total: Mapped[int] = mapped_column(Integer, default=0)
    execution_time_ms: Mapped[int | None] = mapped_column(Integer, nullable=True)
    memory_used_kb: Mapped[int | None] = mapped_column(Integer, nullable=True)
    judge_response: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)

    # Relationships
    user = relationship("User", back_populates="submissions")
    problem = relationship("Problem", back_populates="submissions")
    contest = relationship("Contest", back_populates="submissions")