"""Curate entrypoint (T06): review detect candidates into the Pattern Catalog.

    python -m session_memory.curate [--config PATH] [--auto-approve] [--json]
                                    [--workstream-id ID]

Refreshes candidate patterns (runs the detect pipeline), then drives them through
the review workflow — **interactive** by default, or **batch** with
``--auto-approve`` (promote everything clearing the evidence bar, reject the rest)
for kaizen-agent runs. Candidates are presented cross-flavor first (detect's
ranking). Emits a catalog diff summary and, with ``--json``, a machine-readable
result. Approvals land in the files-first catalog; each final decision is logged
as a hub decision (queued if the hub is down).
"""

from __future__ import annotations

import argparse
import json
import os

from ..detect.__main__ import run_detect
from ..ingest import _expand, load_config
from .catalog import Catalog
from .decisions import DecisionRecorder
from .gating import bloat_warnings, evaluate, gate_config
from .review import APPROVE, DISCUSS, REJECT, ReviewLog, review


def _curate_paths(config: dict):
    c = config.get("curate", {})
    catalog_dir = _expand(c.get("catalog_dir", "session_memory/catalog"))
    review_log = _expand(c.get("review_log", "session_memory/.store/reviews.jsonl"))
    queue = _expand(c.get("decision_queue", "session_memory/.store/decisions.queue.jsonl"))
    ws_id = c.get("state_hub_workstream_id")
    return catalog_dir, review_log, queue, ws_id


def _render_candidate(cand: dict, gate, existing) -> str:
    g = evaluate(cand, gate)
    flag = " [CROSS-FLAVOR]" if cand.get("cross_flavor") else ""
    lines = [
        f"\n{cand['title']}{flag}",
        f"  key={cand['key']}  score={cand.get('score')} freq={cand['frequency']} "
        f"impact={cand.get('cost_impact')}",
        f"  flavors={','.join(cand.get('flavors', []))}  "
        f"repos={','.join(cand.get('repos', [])) or '-'}  sessions={len(cand.get('sessions', []))}",
        f"  gate: promotable={g.promotable} distribution_ready={g.distribution_ready}"
        + (f"  ({'; '.join(g.reasons)})" if g.reasons else ""),
    ]
    for w in bloat_warnings(cand, existing):
        lines.append(f"  bloat: {w}")
    return "\n".join(lines)


def _interactive_decider(gate, catalog):
    def decide(cand):
        print(_render_candidate(cand, gate, catalog.list()))
        while True:
            choice = input("  [a]pprove / [r]eject / [d]iscuss ? ").strip().lower()
            if choice in ("a", "approve"):
                return (APPROVE, input("  rationale: ").strip() or "approved")
            if choice in ("r", "reject"):
                return (REJECT, input("  rationale: ").strip() or "rejected")
            if choice in ("d", "discuss"):
                return (DISCUSS, "deferred for discussion")
    return decide


def _auto_decider(gate):
    """Batch policy: approve candidates clearing the promote floor, reject the rest."""
    def decide(cand):
        g = evaluate(cand, gate)
        if g.promotable:
            return (APPROVE, "auto-approved: clears evidence bar")
        return (REJECT, "auto-rejected: " + "; ".join(g.reasons))
    return decide


def _summary(result, n_candidates: int) -> str:
    added = [k for k, a in result.approved if a in ("added", "versioned", "updated")]
    lines = [
        f"# Curate summary  ({n_candidates} candidates reviewed)",
        f"  approved : {len(result.approved)}  ({', '.join(f'{k}:{a}' for k, a in result.approved) or '-'})",
        f"  rejected : {len(result.rejected)}  ({', '.join(result.rejected) or '-'})",
        f"  deferred : {len(result.deferred)}  ({', '.join(result.deferred) or '-'})",
        f"  skipped  : {len(result.skipped)}  (already decided)",
        f"  catalog writes: {len(added)}",
    ]
    return "\n".join(lines)


def main(argv=None) -> int:
    here = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    ap = argparse.ArgumentParser(description="Curate detect candidates into the Pattern Catalog.")
    ap.add_argument("--config", default=os.path.join(here, "config.toml"))
    ap.add_argument("--auto-approve", action="store_true",
                    help="batch mode: promote everything clearing the evidence bar")
    ap.add_argument("--min-frequency", type=int, default=2)
    ap.add_argument("--workstream-id", default=None, help="hub workstream for decisions")
    ap.add_argument("--json", action="store_true", help="emit machine-readable JSON")
    args = ap.parse_args(argv)

    config = load_config(args.config)
    candidates = run_detect(config, min_frequency=args.min_frequency)

    catalog_dir, review_log_path, queue_path, ws_id = _curate_paths(config)
    gate = gate_config(config)
    catalog = Catalog(catalog_dir)
    log = ReviewLog(review_log_path)
    recorder = DecisionRecorder(queue_path, workstream_id=args.workstream_id or ws_id)

    decide = _auto_decider(gate) if args.auto_approve else _interactive_decider(gate, catalog)
    result = review(candidates, decide, catalog, log, gate=gate, recorder=recorder)

    if args.json:
        print(json.dumps({
            "approved": result.approved, "rejected": result.rejected,
            "deferred": result.deferred, "skipped": result.skipped,
            "decisions_queued": len(recorder.pending()),
        }, indent=2))
    else:
        print(_summary(result, len(candidates)))
        if recorder.pending():
            print(f"  decisions queued (hub offline): {len(recorder.pending())} "
                  f"-> {queue_path}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())