from __future__ import annotations

import argparse
import json
import random
import re
from pathlib import Path
from typing import Any

from tools.query_knowledge import RAW_DIR, iter_source_files, load_source_file


KEY_TERMS = [
    "volatility smile",
    "implied volatility",
    "local volatility",
    "stochastic volatility",
    "Black-Scholes",
    "delta",
    "gamma",
    "vega",
    "theta",
    "rho",
    "skew",
    "straddle",
    "correlation",
    "at-the-money",
    "forward",
    "risk-neutral",
]


PROJECT_ROOT = Path(__file__).resolve().parents[1]
OUTPUT_PATH = PROJECT_ROOT / "eval" / "local_options_eval.jsonl"


def normalize_space(text: str) -> str:
    return re.sub(r"\s+", " ", text).strip()


def extract_keywords(text: str, max_keywords: int = 4) -> list[str]:
    lowered = text.lower()
    keywords = [term for term in KEY_TERMS if term.lower() in lowered]
    equation_ids = re.findall(r"\(\d+\.\d+[a-z]?\)", text)
    formulas = re.findall(r"[A-Za-z𝜎𝜇𝜌𝜃𝛴][A-Za-z0-9𝜎𝜇𝜌𝜃𝛴_{}^]*\s*=", text)
    keywords.extend(equation_ids[:2])
    keywords.extend(item.strip() for item in formulas[:2])

    if not keywords:
        candidates = [
            word
            for word in re.findall(r"[A-Za-z][A-Za-z-]{4,}", text)
            if word.lower() not in {"there", "where", "which", "would", "could", "should", "chapter"}
        ]
        keywords.extend(candidates[:max_keywords])

    deduped = []
    banned = {"id=", "FORMULA", "value ="}
    for keyword in keywords:
        if keyword and keyword not in banned and keyword not in deduped:
            deduped.append(keyword)
    return deduped[:max_keywords]


def is_sane_section(section: str | None) -> bool:
    if not section:
        return False
    section = section.strip()
    if not 6 <= len(section) <= 90:
        return False
    if section.count(",") >= 2:
        return False
    digit_count = sum(char.isdigit() for char in section)
    letter_count = sum(char.isalpha() for char in section)
    if digit_count > max(2, letter_count // 3):
        return False
    if re.search(r"\b(figure|table|printed|united states|amount unit price|call price|under)$", section, re.I):
        return False
    if "figure" in section.lower() or "table" in section.lower():
        return False
    if re.search(r"\b(figure|table|printed|united states|amount unit price|call price)\b", section, re.I):
        return False
    words = section.split()
    if len(words) > 12:
        return False
    return True


def make_case(document: Any, index: int) -> dict[str, Any] | None:
    metadata = document.metadata
    text = normalize_space(document.text)
    if len(text) < 80:
        return None

    page = metadata.get("page_number")
    if isinstance(page, int) and (page < 25 or page > 500):
        return None
    section = metadata.get("section_path") or metadata.get("section_title")
    content_type = metadata.get("content_type", "text")
    formula_id = metadata.get("formula_id")
    keywords = extract_keywords(text)
    if not keywords and not section:
        return None

    if content_type == "formula" or formula_id:
        question = f"What formula or equation is described on page {page}?"
        answer_type = "formula"
    elif is_sane_section(section):
        question = f"What does the section {section} discuss?"
        answer_type = "section"
        keywords.append(section.split(">")[-1].strip())
    else:
        if not keywords:
            return None
        term = keywords[0]
        if term.lower() in {"formula", "id=", "value ="}:
            return None
        question = f"Where does the options reference discuss {term}?"
        answer_type = "concept"

    expected_pages = [page] if page is not None else []
    return {
        "id": f"auto_options_{index:03d}",
        "question": question,
        "expected_pages": expected_pages,
        "expected_keywords": keywords[:5],
        "answer_type": answer_type,
    }


def generate_cases(count: int, seed: int) -> list[dict[str, Any]]:
    documents = []
    for source_file in iter_source_files(RAW_DIR):
        documents.extend(load_source_file(source_file))

    random.Random(seed).shuffle(documents)
    cases = []
    seen_questions = set()
    for document in documents:
        case = make_case(document, len(cases) + 1)
        if not case:
            continue
        if case["question"] in seen_questions:
            continue
        seen_questions.add(case["question"])
        cases.append(case)
        if len(cases) >= count:
            break

    if len(cases) < count:
        raise RuntimeError(f"Only generated {len(cases)} cases; requested {count}.")
    return cases


def main() -> None:
    parser = argparse.ArgumentParser(description="Generate local options RAG eval cases.")
    parser.add_argument("--count", type=int, default=40)
    parser.add_argument("--seed", type=int, default=20260525)
    parser.add_argument("--output", type=Path, default=OUTPUT_PATH)
    args = parser.parse_args()

    cases = generate_cases(args.count, args.seed)
    args.output.parent.mkdir(parents=True, exist_ok=True)
    args.output.write_text(
        "\n".join(json.dumps(case, ensure_ascii=False) for case in cases) + "\n",
        encoding="utf-8",
    )
    print(f"Wrote {len(cases)} cases to {args.output}")


if __name__ == "__main__":
    main()