from __future__ import annotations

from typing import Any


def inject_prompt(global_cfg: dict[str, Any] | None, scene: dict[str, Any]) -> dict[str, str]:
    """
    Unified positive/negative prompt builder.
    Note: current pipeline already injects some globals into `scene["image_prompt"]`.
    """
    global_cfg = global_cfg or {}
    character = str(global_cfg.get("character", "") or "").strip()
    style = str(global_cfg.get("style", "") or "").strip()
    negative = str(global_cfg.get("negative_prompt", "") or "").strip()

    base = str(scene.get("prompt") or scene.get("image_prompt") or "").strip()
    if not base:
        base = str(scene.get("image_prompt") or "")

    positive_parts = [p for p in [character, style, base] if p]
    positive = ", ".join(positive_parts).strip(", ")
    return {"positive": positive, "negative": negative}