"""查重记录 SQLAlchemy 仓库实现。"""

from __future__ import annotations

import json

from sqlalchemy.orm import Session

from packages.adapters.sqlalchemy_impl.models import DuplicationRecordModel, DuplicationSegmentModel
from packages.domain.duplication import DuplicateSegment, DuplicationRecord


class SQLAlchemyDuplicationRecordRepository:
    def __init__(self, session: Session):
        self.session = session

    def create(self, record: DuplicationRecord) -> DuplicationRecord:
        model = DuplicationRecordModel(
            id=record.id,
            user_id=record.user_id,
            filename=record.filename,
            file_size=record.file_size,
            storage_key=record.storage_key,
            duration_seconds=record.duration_seconds,
            status=record.status,
            duplicate_rate=record.duplicate_rate,
            duplicate_count=record.duplicate_count,
            video_fingerprint=json.dumps(record.video_fingerprint) if record.video_fingerprint else None,
            error_message=record.error_message,
            created_at=record.created_at,
            updated_at=record.updated_at,
        )
        self.session.add(model)
        self.session.commit()
        return record

    def get(self, record_id: str) -> DuplicationRecord | None:
        model = self.session.query(DuplicationRecordModel).filter(DuplicationRecordModel.id == record_id).first()
        if model is None:
            return None
        return self._to_domain(model)

    def list_by_user(self, user_id: str, *, offset: int = 0, limit: int = 50) -> list[DuplicationRecord]:
        models = (
            self.session.query(DuplicationRecordModel)
            .filter(DuplicationRecordModel.user_id == user_id)
            .order_by(DuplicationRecordModel.created_at.desc())
            .offset(offset)
            .limit(limit)
            .all()
        )
        return [self._to_domain(m) for m in models]

    def update(self, record: DuplicationRecord) -> DuplicationRecord:
        model = self.session.query(DuplicationRecordModel).filter(DuplicationRecordModel.id == record.id).first()
        if model is None:
            return record
        model.status = record.status
        model.duplicate_rate = record.duplicate_rate
        model.duplicate_count = record.duplicate_count
        model.video_fingerprint = json.dumps(record.video_fingerprint) if record.video_fingerprint else None
        model.error_message = record.error_message
        model.updated_at = record.updated_at

        # 更新 segments：先删后建
        self.session.query(DuplicationSegmentModel).filter(DuplicationSegmentModel.record_id == record.id).delete()
        for seg in record.segments:
            seg_model = DuplicationSegmentModel(
                id=seg.id,
                record_id=record.id,
                source_start=seg.source_start,
                source_end=seg.source_end,
                matched_video_id=seg.matched_video_id,
                matched_video_name=seg.matched_video_name,
                matched_start=seg.matched_start,
                matched_end=seg.matched_end,
                similarity=seg.similarity,
            )
            self.session.add(seg_model)

        self.session.commit()
        return record

    def delete(self, record_id: str) -> bool:
        """
        删除查重记录及其关联片段。

        注意：必须先删片段再删记录，防止进程崩溃时产生孤儿片段数据。
        """
        # 先删关联片段，再删主记录（安全顺序）
        self.session.query(DuplicationSegmentModel).filter(DuplicationSegmentModel.record_id == record_id).delete()
        count = self.session.query(DuplicationRecordModel).filter(DuplicationRecordModel.id == record_id).delete()
        self.session.commit()
        return count > 0

    def _to_domain(self, model: DuplicationRecordModel) -> DuplicationRecord:
        segment_models = (
            self.session.query(DuplicationSegmentModel).filter(DuplicationSegmentModel.record_id == model.id).all()
        )
        segments = [
            DuplicateSegment(
                id=s.id,
                source_start=s.source_start,
                source_end=s.source_end,
                matched_video_id=s.matched_video_id,
                matched_video_name=s.matched_video_name,
                matched_start=s.matched_start,
                matched_end=s.matched_end,
                similarity=s.similarity,
            )
            for s in segment_models
        ]
        fp_raw = getattr(model, "video_fingerprint", None)
        return DuplicationRecord(
            id=model.id,
            user_id=model.user_id,
            filename=model.filename,
            file_size=int(model.file_size or 0),
            storage_key=model.storage_key,
            duration_seconds=model.duration_seconds,
            status=model.status,
            duplicate_rate=model.duplicate_rate,
            duplicate_count=int(model.duplicate_count or 0),
            video_fingerprint=json.loads(fp_raw) if fp_raw else None,
            error_message=getattr(model, "error_message", ""),
            segments=segments,
            created_at=model.created_at,
            updated_at=model.updated_at,
        )