"""Сборка Anima-промптов без LLM (теги, без POV/hybrid)."""

from __future__ import annotations

import re
from dataclasses import dataclass

ANIMA_QUALITY = "masterpiece, best quality, score_7, anime"
ANIMA_NEGATIVE = "worst quality, low quality, score_1, score_2, score_3, blurry, jpeg artifacts, sepia"

_JUNK_STANDALONE_TAGS = frozenset({
    "white", "black", "skin", "ear", "ears", "girl", "boy", "fox", "wolf", "cat",
    "short", "tall", "golden", "silver", "red", "blue", "green", "purple",
    "pink", "brown", "eye", "eyes", "hair",
})


@dataclass(frozen=True)
class AnimaPromptBundle:
    positive: str
    negative: str


def _sanitize_tags(tag_str: str) -> str:
    if not tag_str:
        return ""
    out: list[str] = []
    seen: set[str] = set()
    for raw in tag_str.split(","):
        t = raw.strip()
        if not t:
            continue
        key = t.lower().replace(" ", "_")
        if key in seen or len(key) <= 2:
            continue
        if "_" not in key and key in _JUNK_STANDALONE_TAGS:
            continue
        seen.add(key)
        out.append(t if "_" in t else key)
    return ", ".join(out)


def _append_lora(parts: list[str], lora_name: str, lora_weight: float) -> None:
    lora = (lora_name or "").strip()
    if not lora:
        return
    weight = lora_weight if lora_weight > 0 else 0.8
    parts.append(f"<lora:{lora}:{weight}>")


def build_draw_self_prompt(
    appearance_tags: str,
    *,
    lora_name: str = "",
    lora_weight: float = 0.8,
) -> AnimaPromptBundle:
    """Портрет «нарисуй себя» — только booru-теги, без POV и prose."""
    appearance = _sanitize_tags(appearance_tags)
    action = "looking_at_viewer, smile, upper_body, portrait"
    environment = "simple_background, soft_lighting"

    parts = [ANIMA_QUALITY]
    if appearance:
        parts.append(appearance)
    parts.append(action)
    parts.append(environment)
    _append_lora(parts, lora_name, lora_weight)

    positive = ", ".join(p.strip() for p in parts if p.strip())
    return AnimaPromptBundle(positive=positive, negative=ANIMA_NEGATIVE)


def build_scene_tags_prompt(
    scene_tags: str,
    appearance_tags: str,
    *,
    lora_name: str = "",
    lora_weight: float = 0.8,
) -> AnimaPromptBundle:
    """Прямая сцена из booru-тегов (без LLM)."""
    appearance = _sanitize_tags(appearance_tags)
    scene = _sanitize_tags(scene_tags)
    parts = [ANIMA_QUALITY]
    if appearance:
        parts.append(appearance)
    if scene:
        parts.append(scene)
    _append_lora(parts, lora_name, lora_weight)
    positive = ", ".join(p.strip() for p in parts if p.strip())
    return AnimaPromptBundle(positive=positive, negative=ANIMA_NEGATIVE)


def looks_like_booru_tags(text: str) -> bool:
    """Грубая эвристика: строка похожа на теги, а не на прозу."""
    raw = (text or "").strip()
    if not raw or len(raw) > 400:
        return False
    if raw.count(",") >= 2:
        return True
    return bool(re.search(r"\b\d+(girl|boy)s?\b", raw, re.I))