"""Move article prose into the third person, impersonal, and check the result.

The articles were written as instructions to a clinician — "Obtain a CBC",
"Do not order a scrotal ultrasound", "Counsel parents". Reference prose states
what is done rather than telling the reader to do it: *diagnosis is made by*,
*response to treatment is assessed by*. 819 imperatives across 348 sections
carry that voice.

This does the moving of text, not the writing. `export` writes the affected
sections to batch files; something that can write English rewrites the
`content` of each and saves alongside; `import` checks and applies.

What `import` refuses, because a rewrite must not quietly change the article:

  * a lost or invented cross-reference — the set of `[[id|…]]` targets must match
  * a changed number — every numeric token must survive, so doses, ages,
    thresholds and percentages cannot drift
  * a length outside 0.7-1.4x, which is how a summary or a padding pass looks
  * an empty result

It reports, but allows, imperatives that survive: some are genuinely the right
form inside a quoted protocol.

    python -m scripts.prose_pass export --out /tmp/prose --batches 8
    python -m scripts.prose_pass import --in /tmp/prose
    python -m scripts.prose_pass check
"""
import argparse
import json
import re
import sys
from pathlib import Path

from sqlalchemy.orm.attributes import flag_modified

from app.database import SessionLocal
from app.models.article import Article

MARKER = re.compile(r"\[\[(\d+)\|([^\]]+)\]\]")
NUMBER = re.compile(r"\d+(?:\.\d+)?")
#: Verbs that open a sentence or a bullet as an instruction to the reader.
IMPERATIVE = re.compile(
    r"(?:(?<=^)|(?<=[.!?] )|(?<=^- )|(?<=^\* )|(?<=\n- )|(?<=\n\* ))"
    r"(Obtain|Order|Check|Give|Start|Administer|Consider|Assess|Evaluate|Perform|"
    r"Measure|Repeat|Refer|Avoid|Ensure|Monitor|Treat|Begin|Initiate|Stop|Use|Send|"
    r"Screen|Look|Ask|Confirm|Rule out|Do not|Don't|Reserve|Counsel|Admit|Discharge|"
    r"Suspect|Exclude|Document|Reassess|Titrate|Correct|Repair|Remove|Apply|Prescribe)\b")

MIN_RATIO, MAX_RATIO = 0.7, 1.4


def affected(db):
    """Every section carrying the instructional voice, with its article."""
    out = []
    for article in db.query(Article).order_by(Article.id).all():
        for section in article.sections or []:
            content = section.get("content") or ""
            hits = IMPERATIVE.findall(content)
            if hits:
                out.append({
                    "article_id": article.id,
                    "article_title": article.title,
                    "section_id": section.get("id"),
                    "section_title": section.get("title"),
                    "variant": section.get("variant") or "long",
                    "imperatives": len(hits),
                    "content": content,
                })
    return out


def validate(before: str, after: str) -> list[str]:
    """Reasons this rewrite must not be applied. Empty means it is safe."""
    problems = []
    if not after or not after.strip():
        return ["empty"]

    want = sorted(m.group(1) for m in MARKER.finditer(before))
    got = sorted(m.group(1) for m in MARKER.finditer(after))
    if want != got:
        lost = sorted(set(want) - set(got))
        added = sorted(set(got) - set(want))
        problems.append(f"cross-references changed (lost {lost or '-'}, added {added or '-'})")

    want_n = sorted(NUMBER.findall(before))
    got_n = sorted(NUMBER.findall(after))
    if want_n != got_n:
        lost = sorted(set(want_n) - set(got_n))
        added = sorted(set(got_n) - set(want_n))
        problems.append(f"numbers changed (lost {lost or '-'}, added {added or '-'})")

    ratio = len(after) / max(len(before), 1)
    if not MIN_RATIO <= ratio <= MAX_RATIO:
        problems.append(f"length {ratio:.2f}x of the original")
    return problems


def cmd_export(args) -> int:
    out = Path(args.out)
    out.mkdir(parents=True, exist_ok=True)
    db = SessionLocal()
    try:
        rows = affected(db)
    finally:
        db.close()
    if not rows:
        print("Nothing to rewrite.")
        return 0

    # Whole articles stay together where they can: a rewriter seeing every
    # section of one topic keeps its terminology consistent.
    rows.sort(key=lambda r: (r["article_id"], r["section_title"] or ""))
    per = max(1, -(-len(rows) // args.batches))
    written = 0
    for index in range(args.batches):
        chunk = rows[index * per:(index + 1) * per]
        if not chunk:
            break
        path = out / f"batch-{index + 1:02d}.json"
        path.write_text(json.dumps(chunk, indent=2, ensure_ascii=False))
        written += 1
        print(f"  {path}  {len(chunk):3d} sections, {sum(c['imperatives'] for c in chunk):4d} imperatives")
    print(f"\n{len(rows)} sections in {written} batches.")
    print("Rewrite each entry's `content` and save as batch-NN.done.json alongside.")
    return 0


def cmd_import(args) -> int:
    folder = Path(args.folder)
    done = sorted(folder.glob("*.done.json"))
    if not done:
        print(f"No *.done.json in {folder}")
        return 1

    db = SessionLocal()
    try:
        articles = {a.id: a for a in db.query(Article).all()}
        applied = skipped = 0
        for path in done:
            entries = json.loads(path.read_text())
            for entry in entries:
                article = articles.get(entry["article_id"])
                if not article:
                    continue
                section = next((s for s in (article.sections or [])
                                if s.get("id") == entry["section_id"]), None)
                if not section:
                    print(f"  ! {entry['article_title']} / {entry['section_title']}: section is gone")
                    skipped += 1
                    continue
                before, after = section.get("content") or "", entry["content"]
                if before == after:
                    continue
                problems = validate(before, after)
                if problems:
                    print(f"  ! {entry['article_title']} / {entry['section_title']}: {'; '.join(problems)}")
                    skipped += 1
                    continue
                section["content"] = after
                flag_modified(article, "sections")
                applied += 1
        print(f"\n  applied: {applied}   refused: {skipped}")
        if args.apply:
            db.commit()
            print("  committed.")
        else:
            print("\n  Re-run with --apply to write.")
    finally:
        db.close()
    return 0


def cmd_check(args) -> int:
    db = SessionLocal()
    try:
        rows = affected(db)
        total = sum(r["imperatives"] for r in rows)
        articles = len({r["article_id"] for r in rows})
        print(f"  {total} imperatives in {len(rows)} sections across {articles} articles")
        for row in sorted(rows, key=lambda r: -r["imperatives"])[:10]:
            print(f"    {row['imperatives']:3d}  {row['article_title']} / {row['section_title']}")
    finally:
        db.close()
    return 0


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    sub = parser.add_subparsers(dest="cmd", required=True)

    export = sub.add_parser("export")
    export.add_argument("--out", required=True)
    export.add_argument("--batches", type=int, default=8)
    export.set_defaults(func=cmd_export)

    imp = sub.add_parser("import")
    imp.add_argument("--in", dest="folder", required=True)
    imp.add_argument("--apply", action="store_true")
    imp.set_defaults(func=cmd_import)

    check = sub.add_parser("check")
    check.set_defaults(func=cmd_check)

    args = parser.parse_args()
    return args.func(args)


if __name__ == "__main__":
    sys.exit(main())