cli/commands/export.py

"""kdc export command — re-export metadata into Parquet/JSONL datasets."""

from __future__ import annotations

import json
from pathlib import Path

import typer
from rich.console import Console

from app.models.document import DocumentMeta
from app.utils.container import Container

app = typer.Typer(help="Export metadata to Parquet or JSONL datasets.")
console = Console()


@app.command()
def run(
    ctx: typer.Context,
    meta_dir: Path = typer.Option(Path("metadata"), "--meta-dir", help="Metadata directory."),
    format: str = typer.Option("both", "--format", help="Export format: parquet | jsonl | both"),
) -> None:
    """Re-export metadata files into Parquet or JSONL dataset formats."""
    container: Container = ctx.obj
    meta_dir = meta_dir.resolve()
    files = list(meta_dir.glob("*.json"))

    if not files:
        console.print(f"[yellow]No metadata files found in {meta_dir}[/yellow]")
        raise typer.Exit()

    documents: list[DocumentMeta] = []
    for f in files:
        try:
            data = json.loads(f.read_text(encoding="utf-8"))
            documents.append(DocumentMeta.model_validate(data))
        except Exception as exc:
            console.print(f"[yellow]Skipping invalid JSON {f.name}: {exc}[/yellow]")

    fmt = format.lower()
    if fmt in ("parquet", "both") and container.parquet_exporter:
        path = container.parquet_exporter.export(documents)
        console.print(f"[green]✓ Parquet dataset exported to {path}[/green]")

    if fmt in ("jsonl", "both") and container.jsonl_exporter:
        path = container.jsonl_exporter.export(documents)
        console.print(f"[green]✓ JSONL dataset exported to {path}[/green]")