"""Auto-generate docs/LIVE_AI_PROMPTS.md for the v2 backend.

Scans live prompt constants and builder functions under ``backend/prompts/``.
Run as a script or import ``generate_prompt_inventory``.
"""

from __future__ import annotations

import inspect
import textwrap
from datetime import datetime, timezone
from pathlib import Path

from backend.config import REPO_ROOT

_PROMPTS_PKG = Path(__file__).resolve().parents[1] / "prompts"
_OUTPUT = REPO_ROOT / "docs" / "LIVE_AI_PROMPTS_V2.md"

_MODULES = (
    ("discovery", "backend.prompts.discovery_prompt"),
    ("hybrid_discovery", "backend.models.hybrid_discovery"),
    ("mapping", "backend.prompts.mapping_prompt"),
    ("grounding", "backend.prompts.grounding_prompt"),
    ("notes_expander", "backend.prompts.notes_expander"),
)


def _import_module(dotted: str):
    import importlib

    return importlib.import_module(dotted)


def _collect_entries() -> list[tuple[str, str, str]]:
    """Return (module_label, name, content) for each live prompt artifact."""
    entries: list[tuple[str, str, str]] = []
    for label, dotted in _MODULES:
        mod = _import_module(dotted)
        for name, obj in sorted(vars(mod).items()):
            if name.startswith("_"):
                continue
            if isinstance(obj, str) and len(obj.strip()) > 40:
                entries.append((label, name, obj.strip()))
            elif callable(obj) and name.startswith("build_"):
                src = inspect.getsource(obj).strip()
                entries.append((label, f"{name}()", f"```python\n{src}\n```"))
    return entries


def generate_markdown() -> str:
    entries = _collect_entries()
    ts = datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M UTC")
    lines = [
        "# Live AI Prompts — v2 Backend",
        "",
        f"Auto-generated by `backend/utils/prompt_inventory.py` on {ts}.",
        "Do not hand-edit; re-run the generator after prompt changes.",
        "",
        "## Operator bundle context",
        "",
        "- **Report template (PDF)** drives schema/section order only.",
        "- **Standard paragraphs (Word)** supply MASTER RAG wording.",
        "- LLM calls: discovery enrichment, per-section mapping, grounding audit, optional notes expand.",
        "",
    ]
    current_label = ""
    for label, name, content in entries:
        if label != current_label:
            lines.extend(["", f"## {label}", ""])
            current_label = label
        lines.append(f"### `{name}`")
        lines.append("")
        if content.startswith("```"):
            lines.append(content)
        else:
            lines.append(textwrap.indent(content, ""))
        lines.append("")
    return "\n".join(lines).strip() + "\n"


def write_inventory(path: Path | None = None) -> Path:
    target = path or _OUTPUT
    target.parent.mkdir(parents=True, exist_ok=True)
    target.write_text(generate_markdown(), encoding="utf-8")
    return target


if __name__ == "__main__":
    out = write_inventory()
    print(f"Wrote {out}")