"""Trace builder and saver for generation runs."""

from __future__ import annotations

import json
from datetime import datetime, timezone
from pathlib import Path
from uuid import uuid4

from src.config import TRACE_DIR, get_runtime_settings, runtime_status
from src.models.schema import DiaryEntry, ObjectUnderstanding, PersonaEnvelope, TraceRecord
from src.traces.anonymizer import anonymize_text


def build_trace(
    image_path: str | None,
    description: str,
    mode: str,
    object_understanding: ObjectUnderstanding,
    persona: PersonaEnvelope,
    diary: DiaryEntry,
    trace_id: str | None = None,
    created_at: datetime | None = None,
    model_runtime: dict[str, str] | None = None,
    fallbacks: list[str] | None = None,
) -> TraceRecord:
    return TraceRecord(
        trace_id=trace_id or uuid4().hex,
        created_at=created_at or datetime.now(timezone.utc),
        mode=mode,
        input={
            "has_image": bool(image_path),
            "image_filename": Path(image_path).name if image_path else None,
            "description": anonymize_text(description),
        },
        object_understanding=object_understanding,
        persona=persona,
        diary=diary,
        model_runtime=model_runtime or runtime_status(get_runtime_settings()),
        fallbacks=fallbacks if fallbacks is not None else ["mock-runtime"],
    )


def save_trace(trace: TraceRecord, trace_dir: Path = TRACE_DIR) -> str:
    trace_dir.mkdir(parents=True, exist_ok=True)
    path = trace_dir / f"{trace.trace_id}.json"
    path.write_text(
        json.dumps(trace.model_dump(mode="json"), ensure_ascii=False, indent=2),
        encoding="utf-8",
    )
    return str(path)