import json
from pathlib import Path
from uuid import uuid4

from app.core.config import Settings
from app.models.schemas import ChannelProfile, JobSnapshot, utc_now


class JobStore:
    def __init__(self, settings: Settings) -> None:
        self.settings = settings
        self.root = settings.storage_dir
        self.jobs_root = self.root / "jobs"
        self.jobs_root.mkdir(parents=True, exist_ok=True)

    def create_job(self, profile: ChannelProfile, source: dict) -> JobSnapshot:
        job_id = uuid4().hex
        job_dir = self.job_dir(job_id)
        job_dir.mkdir(parents=True, exist_ok=True)
        snapshot = JobSnapshot(
            id=job_id,
            status="queued",
            progress=0,
            message="Queued",
            source=source,
            profile=profile,
        )
        self.save_job(snapshot)
        return snapshot

    def job_dir(self, job_id: str) -> Path:
        return self.jobs_root / job_id

    def media_url(self, job_id: str, filename: str) -> str:
        return f"/media/jobs/{job_id}/{filename}"

    def save_job(self, snapshot: JobSnapshot) -> JobSnapshot:
        snapshot.updated_at = utc_now()
        path = self.job_dir(snapshot.id) / "job.json"
        path.write_text(snapshot.model_dump_json(indent=2), encoding="utf-8")
        return snapshot

    def get_job(self, job_id: str) -> JobSnapshot:
        path = self.job_dir(job_id) / "job.json"
        if not path.exists():
            raise FileNotFoundError(job_id)
        data = json.loads(path.read_text(encoding="utf-8"))
        return JobSnapshot.model_validate(data)

    def update_job(self, job_id: str, **updates) -> JobSnapshot:
        snapshot = self.get_job(job_id)
        updated = snapshot.model_copy(update=updates)
        return self.save_job(updated)

    def write_json(self, job_id: str, filename: str, payload: object) -> Path:
        path = self.job_dir(job_id) / filename
        path.write_text(json.dumps(payload, indent=2, ensure_ascii=False), encoding="utf-8")
        return path