"""
app/services/fission_image_retry.py — 第11环裂变 失败分镜补图（中转站波动兜底）

实测发现 codeproxy 偶发不稳，单套中某张图重试3次仍失败会记 error 落库。
本模块对某一套(FissionNote)只补 images_json 里标了 error 的分镜：成功的不动，
失败的用引擎 target_role 单张重生(R2 零改动)，merge 回 images_json。

🔴 生图引擎零改动；只补失败 role，避免整套重生浪费已成功的图与 token。
"""
import logging

from sqlalchemy.orm import Session

logger = logging.getLogger(__name__)


def _failed_roles(images: list[dict]) -> list[str]:
    """从 images_json 解析出标了 error 的分镜 role 列表。"""
    return [img.get("role", "") for img in images if img.get("error") and img.get("role")]


def retry_fission_note_images(
    db: Session, clients, ft, product: dict, image_count: int, note_id: int,
) -> dict:
    """对单套 FissionNote 只补失败分镜。返回 {seq, retried, recovered, still_failed}。"""
    import asyncio
    import json as _json
    import os

    from app.models.fission import FissionNote
    from app.core.config import get_settings
    from app.services.ai_engine.image_gen import generate_storyboard_images
    from app.services.ai_engine.image_postprocessor import process_image
    from app.workers.pipeline_io import _resolve_image_path

    fn = db.query(FissionNote).filter(FissionNote.id == note_id).first()
    if not fn:
        return {"seq": None, "retried": 0, "recovered": 0, "still_failed": 0}

    try:
        images = _json.loads(fn.images_json) if fn.images_json else []
    except (ValueError, TypeError):
        images = []
    try:
        note = _json.loads(fn.note_json) if fn.note_json else {}
    except (ValueError, TypeError):
        note = {}

    failed = _failed_roles(images)
    if not failed:
        return {"seq": fn.seq, "retried": 0, "recovered": 0, "still_failed": 0}

    # 参考图沿用源产品同一张（与首轮生图一致）
    reference_images = None
    _img_path = _resolve_image_path(product.get("image_path", ""))
    if _img_path and os.path.isfile(_img_path):
        try:
            with open(_img_path, "rb") as f:
                reference_images = [f.read()]
        except Exception as e:  # noqa: BLE001
            logger.warning("裂变补图参考图读取失败，无参考图模式: %s", e)

    upload_base = get_settings().UPLOAD_ABS_ROOT
    img_dir = os.path.join(upload_base, str(ft.workspace_id), f"fission_{ft.id}", str(fn.seq))
    os.makedirs(img_dir, exist_ok=True)

    recovered = 0
    # role → 在 images 列表里的位置(保持原顺序/seq 不乱)
    role_idx = {img.get("role"): i for i, img in enumerate(images)}
    for role in failed:
        try:
            results = asyncio.run(generate_storyboard_images(
                client=clients, note=note, product=product,
                image_count=image_count, reference_images=reference_images,
                target_role=role,
            ))
        except Exception as exc:  # noqa: BLE001
            logger.error("裂变补图 seq=%s role=%s 仍失败: %s", fn.seq, role, exc)
            continue
        r = next((x for x in results if x.get("role") == role), None)
        if not r or r.get("error") or not r.get("image_bytes"):
            logger.warning("裂变补图 seq=%s role=%s 引擎返回空/error", fn.seq, role)
            continue
        try:
            processed = process_image(r["image_bytes"], aspect_ratio="3:4", resample_strength=1)
        except Exception:  # noqa: BLE001
            processed = r["image_bytes"]
        idx = role_idx.get(role, len(images))
        seq_no = idx + 1
        fname = f"{seq_no:02d}_{role}.jpg"
        with open(os.path.join(img_dir, fname), "wb") as f:
            f.write(processed)
        entry = {"role": role, "seq": seq_no,
                 "url": f"/uploads/{ft.workspace_id}/fission_{ft.id}/{fn.seq}/{fname}"}
        if idx < len(images):
            images[idx] = entry
        else:
            images.append(entry)
        recovered += 1

    fn.images_json = _json.dumps(images, ensure_ascii=False)
    still = len(_failed_roles(images))
    fn.status = "image_done" if still == 0 else fn.status
    db.commit()
    return {"seq": fn.seq, "retried": len(failed), "recovered": recovered, "still_failed": still}