"""One-shot preprocessing commands."""

from __future__ import annotations

import json
from pathlib import Path

import typer

from tht.cli.config_cmd import CONFIG_OPT


preprocess_app = typer.Typer(help="Materialize versioned preprocessing artifacts")


def run_from_config(config: Path, *, dry_run: bool = False, resume: str | None = None):
    from tht.adapters.factory import build_evidence_sources, build_vector_store
    from tht.cli.schema_cmd import _load_config_or_exit
    from tht.cli.vector_cmd import make_embedder
    from tht.corpus.chunk import ChunkPolicy
    from tht.corpus.pipeline import CorpusPipeline
    from tht.corpus.store import CorpusStore

    cfg = _load_config_or_exit(config)
    if cfg.embeddings is None:
        raise RuntimeError("embeddings are not configured")
    corpus_root = cfg.paths.artifacts.parent / "corpus"
    generation = None
    if resume:
        generation = resume if resume.startswith("gen:") else f"gen:{resume}"
    pipeline = CorpusPipeline(
        store=CorpusStore(corpus_root), sources=build_evidence_sources(cfg),
        embedder=make_embedder(cfg.embeddings),
        vector_store=build_vector_store(cfg, require_write=True),
        embedding_model=cfg.embeddings.model, embedding_dimensions=cfg.embeddings.dim,
        chunk_policy=ChunkPolicy(version="chunk-v1", max_chars=cfg.vector.max_chunk_chars),
        pipeline_version="evidence-v1",
    )
    return pipeline.run(dry_run=dry_run, resume=generation)


@preprocess_app.command("evidence")
def evidence_cmd(
    config: Path = CONFIG_OPT,
    dry_run: bool = typer.Option(False, "--dry-run"),
    resume: str | None = typer.Option(None, "--resume"),
    json_output: bool = typer.Option(False, "--json"),
) -> None:
    try:
        result = run_from_config(config, dry_run=dry_run, resume=resume)
    except Exception:
        payload = {"status": "failed", "error": "preprocessing failed"}
        if json_output:
            typer.echo(json.dumps(payload, sort_keys=True))
        else:
            typer.secho("ERRORE: preprocessing failed", fg=typer.colors.RED, err=True)
        raise typer.Exit(code=1) from None
    payload = result.model_dump(mode="json")
    if json_output:
        typer.echo(json.dumps(payload, ensure_ascii=False, sort_keys=True))
    else:
        typer.echo(
            f"OK: generation={payload['generation']} changed={len(payload['changed'])} "
            f"unchanged={len(payload['unchanged'])} removed={len(payload['removed'])}"
        )