"""Campaign data access — reads from local JSON file (dev).

File location: settings.campaigns_file (default: data/campaigns.json).
"""

from __future__ import annotations

import json
import logging
from pathlib import Path
from typing import Any, cast

from marketing_intelligence.core.config import settings
from marketing_intelligence.core.models import Campaign

logger = logging.getLogger(__name__)


def _fetch_local() -> list[dict[str, Any]]:
    path = Path(settings.campaigns_file)
    if not path.exists():
        logger.warning("campaigns file not found: %s", path)
        return []
    return cast(list[dict[str, Any]], json.loads(path.read_text(encoding="utf-8")))


def _to_campaigns(rows: list[dict[str, Any]]) -> list[Campaign]:
    return [Campaign.model_validate(r) for r in rows if r.get("status") == "active"]


def list_active_campaigns() -> list[Campaign]:
    """Return all active campaigns from the local JSON file."""
    return _to_campaigns(_fetch_local())


def get_campaign(campaign_id: str) -> Campaign | None:
    """Return one campaign by campaign_id or campaign_key."""
    for c in list_active_campaigns():
        if c.campaign_id == campaign_id or c.campaign_key == campaign_id:
            return c
    return None