from fastapi import HTTPException
from sqlalchemy.ext.asyncio import AsyncSession

from job.candidate.models import Interviews
from job.history.enums import HistoryEvent
from job.history.views import HistoryRecorder
from job.interviews.serializers import serialize_interview
from job.job_post.models import JobPosts


class Interview:
    def __init__(self,session:AsyncSession):
        self.session=session

    async def _job_title_for(self,row):
        inbox=getattr(row,"inbox",None)
        messages=getattr(inbox,"messages",None) if inbox else None
        job_post_id=getattr(messages,"assigned_job_post_id",None) if messages else None
        if not job_post_id:
            return None
        job=await JobPosts.get_job_post_by_id(self.session,str(job_post_id))
        return job.title if job else None

    async def _serialize(self,row):
        return serialize_interview(row,job_title=await self._job_title_for(row))

    async def get_interview(self,interview_id=None,inbox_id=None,from_date=None,to_date=None,status=None,top=None,skip=0):
        if interview_id:
            row=await Interviews.get_interview_by_id(self.session,interview_id)
            if not row:
                raise HTTPException(status_code=404,detail="Interview not found")
            return serialize_interview(row)
        if inbox_id is not None:
            rows=await Interviews.get_interviews_by_inbox(self.session,int(inbox_id))
            return [serialize_interview(r) for r in rows]
        if from_date is not None or to_date is not None or status is not None or top is not None:
            return await self.get_interviews_range(
                from_date=from_date,to_date=to_date,status=status,top=top,skip=skip,
            )
        raise HTTPException(status_code=400,detail="interview_id or inbox_id is required")

    async def get_interviews_range(self,from_date=None,to_date=None,status=None,top=None,skip=0):
        rows,total=await Interviews.get_interviews_in_range(
            self.session,
            from_date=from_date,
            to_date=to_date,
            status=status,
            top=top,
            skip=skip,
        )
        titles=await Interviews.job_titles_by_inbox(self.session,[r.inbox_id for r in rows])
        return [serialize_interview(r,job_title=titles.get(r.inbox_id)) for r in rows],total

    async def create_interview(self,payload,current_user=None):
        fields={
            "interview_date":payload.get("interview_date"),
            "interview_time":payload.get("interview_time"),
            "interview_type":payload.get("interview_type") or "",
            "interview_status":payload.get("interview_status") or "",
            "inbox_id":payload.get("inbox_id"),
        }
        fields={k:v for k,v in fields.items() if v is not None}
        row=await Interviews.insert_interview(self.session,fields)
        when=row.interview_date or row.interview_time
        desc=f"{row.interview_type or 'Interview'} on {when.isoformat() if when else '—'}"
        await HistoryRecorder(self.session).record(
            HistoryEvent.INTERVIEW_CREATED.value,
            current_user=current_user,inbox_id=row.inbox_id,
            entity_type="interview",entity_id=row.id,
            to_value=row.interview_status or None,description=desc,commit=True,
        )
        return await self._serialize(row)

    async def update_interview(self,interview_id,payload,current_user=None):
        fields={k:v for k,v in payload.items() if v is not None}
        if not fields:
            raise HTTPException(status_code=400,detail="No fields to update")
        before=await Interviews.get_interview_by_id(self.session,interview_id)
        if not before:
            raise HTTPException(status_code=404,detail="Interview not found")
        old_status=before.interview_status or None
        row=await Interviews.update_interview(self.session,interview_id,fields)
        if not row:
            raise HTTPException(status_code=404,detail="Interview not found")
        when=row.interview_date or row.interview_time
        desc=f"{row.interview_type or 'Interview'} on {when.isoformat() if when else '—'}"
        await HistoryRecorder(self.session).record(
            HistoryEvent.INTERVIEW_UPDATED.value,
            current_user=current_user,inbox_id=row.inbox_id,
            entity_type="interview",entity_id=row.id,
            from_value=old_status,to_value=row.interview_status or None,
            description=desc,commit=True,
        )
        return await self._serialize(row)