"""
Export module — writes final artifacts (JSON summary, per-stage outputs).

Engine contract:
    run(EngineInput) -> EngineOutput

The main report generation (HTML, CSV, JSONL) is handled by
``engine.reporting``.  This module produces a supplementary JSON
summary artifact in the run directory.
"""

from __future__ import annotations

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

from engine.io_contract import (
    Artifact,
    EngineInput,
    EngineOutput,
    StageStatus,
)

logger = logging.getLogger("modules.export")


def run(engine_input: EngineInput) -> EngineOutput:
    """
    Export a JSON summary of the pipeline run.
    """
    try:
        run_dir = Path(engine_input.run_dir)
        exports_dir = run_dir / "exports"
        exports_dir.mkdir(parents=True, exist_ok=True)

        # Build summary
        summary_data = {
            "run_id": engine_input.run_id,
            "total_records": len(engine_input.records),
            "input_files": [
                {
                    "name": f.path.name,
                    "type": f.file_type.value,
                    "size": f.size_bytes,
                }
                for f in engine_input.input_spec.files
            ],
            "record_sample": [
                {
                    "row_id": r.row_id,
                    "source": r.source_file,
                    "entity_name": r.entity_name,
                    "entity_email": r.entity_email,
                    "entity_ip": r.entity_ip,
                }
                for r in engine_input.records[:20]
            ],
        }

        out_path = exports_dir / "summary.json"
        out_path.write_text(
            json.dumps(summary_data, indent=2, ensure_ascii=False, default=str),
            encoding="utf-8",
        )
        logger.info("Exported summary to %s", out_path)

        return EngineOutput(
            stage="export",
            status=StageStatus.SUCCESS,
            records=engine_input.records,  # pass through
            artifacts=[
                Artifact(
                    name="summary.json",
                    path=out_path,
                    mime_type="application/json",
                    description="Pipeline run summary",
                )
            ],
            summary=f"Exported summary.json ({len(engine_input.records)} records)",
        )
    except Exception as exc:
        logger.error("Export failed: %s", exc, exc_info=True)
        return EngineOutput(
            stage="export",
            status=StageStatus.FAILED,
            error=str(exc),
        )


# ---------------------------------------------------------------------------
# Legacy compatibility
# ---------------------------------------------------------------------------

def export(data: Any, outpath: str) -> str:
    """Legacy wrapper (deprecated). Use ``run()`` instead."""
    with open(outpath, "w") as f:
        f.write(str(data))
    return outpath


if __name__ == "__main__":
    print(export({"result": 123}, "output.txt"))