from __future__ import annotations

import io
import json
import os
import hashlib
import shutil
import time
from contextlib import contextmanager
from dataclasses import dataclass
from pathlib import Path
from typing import Any, Callable

from PIL import Image

from src.character_spike.assets import make_thumbnail_grid, normalize_to_stage_canvas, write_report
from src.character_spike.schema import EXPRESSIONS, default_character_package, slugify_identifier
from src.character_spike.tavern_import import convert_tavern_card, load_tavern_json


PROJECT_ROOT = Path(__file__).resolve().parents[1]
WORKSHOP_ROOT = PROJECT_ROOT / "assets" / "generated" / "character_workshop"
INSTALLED_CHARACTER_ROOT = PROJECT_ROOT / "assets" / "characters"
INSTALLED_BACKGROUND_ROOT = PROJECT_ROOT / "assets" / "backgrounds"
INSTALLED_CHARACTER_JSON_ROOT = PROJECT_ROOT / "characters"
REMBG_MODEL_ROOT = PROJECT_ROOT / ".tmp" / "rembg-models"
QWEN_CANDIDATE = "qwen_image"

EXPRESSION_PROMPTS = {
    "idle": "neutral idle expression, relaxed posture",
    "listening": "listening expression, attentive eyes, slight head tilt",
    "thinking": "thinking expression, one hand near chin, focused eyes",
    "worried": "worried expression, gentle concern, tense shoulders",
    "smile": "small warm smile, calm and friendly",
    "happy": "bright happy expression, open eyes, energetic",
    "talk": "speaking expression, mouth open naturally, conversational pose",
    "focus": "focused determined expression, stable confident posture",
}

REMOTE_PROBE: Callable[..., dict[str, Any]] | None = None
_REMBG_SESSION: Any = None
LOGIN_REQUIRED_MESSAGE = "请先使用 Hugging Face 登录，登录后会保存你的角色生成进度。"


@dataclass(frozen=True)
class UserContext:
    username: str
    display_name: str
    authenticated: bool
    user_id_hash: str
    storage_key: str


def get_current_user(profile: Any | None) -> UserContext:
    username = _profile_value(profile, "username")
    name = _profile_value(profile, "name") or username
    if username:
        storage_key = slugify_identifier(username, fallback="hf_user")
        return UserContext(
            username=username,
            display_name=name or username,
            authenticated=True,
            user_id_hash=_hash_user_id(username),
            storage_key=storage_key,
        )
    return UserContext(
        username="anonymous",
        display_name="未登录用户",
        authenticated=False,
        user_id_hash=_hash_user_id("anonymous"),
        storage_key="legacy",
    )


def require_login_for_generation(profile: Any | None) -> UserContext:
    user = get_current_user(profile)
    if not user.authenticated:
        raise ValueError(LOGIN_REQUIRED_MESSAGE)
    return user


def resolve_data_root() -> Path:
    configured = os.environ.get("VC_DATA_ROOT")
    if configured:
        return Path(configured)
    data_mount = Path("/data")
    if data_mount.exists() and os.access(data_mount, os.W_OK):
        return data_mount / "virtual_characters"
    return WORKSHOP_ROOT


def user_workshop_root(user: UserContext) -> Path:
    return resolve_data_root() / "users" / user.storage_key / "character_workshop"


def create_draft_from_form(
    *,
    display_name: str,
    description: str,
    personality: str,
    scenario: str,
    first_mes: str,
    tags: str = "",
) -> dict[str, Any]:
    name = (display_name or "新角色").strip()
    character_id = slugify_identifier(name, fallback="workshop_character")
    package = default_character_package(character_id, name)
    if description.strip():
        package["description"] = description.strip()
        package["summary"] = _summary(description.strip())
        package["profile"]["identity"] = _first_line(description.strip())
    if personality.strip():
        package["personality"] = personality.strip()
        package["profile"]["core_traits"] = _split_tags(personality)[:8] or package["profile"]["core_traits"]
    if scenario.strip():
        package["scenario"] = scenario.strip()
        package["profile"]["relationship_to_user"] = _first_line(scenario.strip())
    if first_mes.strip():
        package["first_mes"] = first_mes.strip()
    parsed_tags = _split_tags(tags)
    if parsed_tags:
        package["tags"] = parsed_tags
    package["metadata"]["source"] = "character_workshop_draft"
    return package


def create_draft_from_tavern_json(file: Any) -> dict[str, Any]:
    path = _file_path(file)
    if not path:
        raise ValueError("请先上传 Tavern JSON 角色卡。")
    package = convert_tavern_card(load_tavern_json(path))
    package["metadata"]["source"] = "character_workshop_tavern_json"
    return package


def create_initial_state(
    draft: dict[str, Any],
    *,
    user: UserContext | None = None,
    persist: bool = True,
) -> dict[str, Any]:
    character_id = slugify_identifier(str(draft.get("id") or draft.get("display_name") or "workshop_character"))
    draft["id"] = character_id
    draft["visual"]["avatar"] = character_id
    draft["visual"]["background_image"] = f"{character_id}_background"
    state = {
        "draft": draft,
        "character_id": character_id,
        "run_dir": None,
        "main_candidates": [],
        "selected_candidate_index": None,
        "expression_assets": {},
        "background_asset": None,
        "manifest_path": None,
        "installed_character_id": None,
    }
    if not persist:
        return state

    run_dir = _unique_run_dir(character_id, user=user)
    _initialize_run_dir(run_dir, draft, user=user)
    state["run_dir"] = str(run_dir)
    state["manifest_path"] = str(run_dir / "manifest.json")
    return state


def ensure_user_workshop_run(state: dict[str, Any], user: UserContext) -> dict[str, Any]:
    state = _ensure_draft_state(state)
    if state.get("run_dir"):
        return load_workshop_run(state["run_dir"], user=user)
    draft = dict(state["draft"])
    character_id = slugify_identifier(str(draft.get("id") or draft.get("display_name") or "workshop_character"))
    run_dir = _unique_run_dir(character_id, user=user)
    _initialize_run_dir(run_dir, draft, user=user)
    return load_workshop_run(run_dir, user=user)


def list_user_workshop_runs(user: UserContext, *, limit: int = 50) -> list[tuple[str, str]]:
    root = user_workshop_root(user) if user.authenticated else WORKSHOP_ROOT
    runs = []
    for manifest_path in root.glob("*/*/manifest.json"):
        run_dir = manifest_path.parent
        try:
            summary = summarize_workshop_run(run_dir)
        except Exception:
            continue
        runs.append(summary)
    runs.sort(key=lambda item: item["updated_at_unix"], reverse=True)
    return [(item["label"], item["run_dir"]) for item in runs[:limit]]


def summarize_workshop_run(run_dir: str | Path) -> dict[str, Any]:
    run_dir = Path(run_dir)
    manifest = _read_manifest(run_dir)
    state = _state_from_manifest(run_dir, manifest)
    stage = _workflow_stage(state, manifest)
    updated = int(manifest.get("updated_at_unix") or manifest.get("created_at_unix") or run_dir.stat().st_mtime)
    timestamp = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(updated))
    display_name = str(manifest.get("display_name") or state.get("draft", {}).get("display_name") or state.get("character_id") or "未命名角色")
    next_step = _next_step_label(stage)
    return {
        "label": f"{display_name} / {timestamp} / {stage} / {next_step}",
        "run_dir": str(run_dir),
        "stage": stage,
        "updated_at_unix": updated,
        "character_id": state.get("character_id"),
        "display_name": display_name,
    }


def load_workshop_run(run_dir: str | Path, *, user: UserContext | None = None) -> dict[str, Any]:
    run_dir = Path(run_dir).resolve()
    if user is not None:
        allowed_root = (user_workshop_root(user) if user.authenticated else WORKSHOP_ROOT).resolve()
        if not _is_relative_to(run_dir, allowed_root):
            raise ValueError("不能加载其他用户的角色生成任务。")
    manifest = _read_manifest(run_dir)
    state = _state_from_manifest(run_dir, manifest)
    _sync_manifest_state(run_dir, state, manifest)
    return state


def record_workshop_event(user: UserContext, event: str, payload: dict[str, Any] | None = None) -> None:
    try:
        payload = dict(payload or {})
        data_root = resolve_data_root()
        stats_dir = data_root / "stats"
        stats_dir.mkdir(parents=True, exist_ok=True)
        record = {
            "time_unix": int(time.time()),
            "user_id_hash": user.user_id_hash,
            "authenticated": user.authenticated,
            "event": event,
            "stage": payload.get("stage"),
            "character_id": payload.get("character_id"),
            "duration_seconds": payload.get("duration_seconds"),
            "success": payload.get("success"),
            "failure_reason": payload.get("failure_reason"),
            "image_count": payload.get("image_count"),
            "modal_state": payload.get("modal_state"),
        }
        with (stats_dir / "events.jsonl").open("a", encoding="utf-8") as handle:
            handle.write(json.dumps(record, ensure_ascii=False) + "\n")
    except OSError:
        return


def summarize_workshop_stats() -> dict[str, Any]:
    stats_path = resolve_data_root() / "stats" / "events.jsonl"
    if not stats_path.exists():
        return {"events": 0, "users": 0, "tasks": 0, "success_rate": None, "failures_by_stage": {}}
    events = []
    for line in stats_path.read_text(encoding="utf-8").splitlines():
        if not line.strip():
            continue
        try:
            events.append(json.loads(line))
        except json.JSONDecodeError:
            continue
    successes = [event for event in events if event.get("success") is True]
    completed = [event for event in events if event.get("success") is not None]
    durations = [float(event["duration_seconds"]) for event in events if event.get("duration_seconds") is not None]
    failures_by_stage: dict[str, int] = {}
    for event in events:
        if event.get("success") is False:
            stage = str(event.get("stage") or "unknown")
            failures_by_stage[stage] = failures_by_stage.get(stage, 0) + 1
    return {
        "events": len(events),
        "users": len({event.get("user_id_hash") for event in events if event.get("user_id_hash")}),
        "tasks": len({event.get("character_id") for event in events if event.get("character_id")}),
        "success_rate": round(len(successes) / len(completed), 4) if completed else None,
        "average_duration_seconds": round(sum(durations) / len(durations), 3) if durations else None,
        "failures_by_stage": failures_by_stage,
    }


def generate_main_candidates(state: dict[str, Any], *, seed: int = 42) -> dict[str, Any]:
    state = _ensure_state(state)
    draft = state["draft"]
    run_dir = Path(state["run_dir"])
    manifest = _read_manifest(run_dir)
    existing = _existing_main_candidates(run_dir, manifest)
    if len(existing) >= 4:
        state["main_candidates"] = [str(path) for path in existing[:4]]
        if state.get("selected_candidate_index") is None:
            state["selected_candidate_index"] = int(manifest.get("selected_candidate_index") or 0)
        _sync_manifest_state(run_dir, state, manifest)
        return state

    started = time.perf_counter()
    prompt = _main_visual_prompt(draft)
    result = _remote_probe(
        candidate_id=QWEN_CANDIDATE,
        prompt=prompt,
        batch_size=4,
        seed=seed,
        width=768,
        height=1024,
    )
    _raise_for_probe_failure(result)
    paths = _write_image_payloads(run_dir / "main_candidates", result.get("images", []), expected=4)
    state["main_candidates"] = [str(path) for path in paths]
    state["selected_candidate_index"] = 0
    manifest["main_candidates"] = [str(path.relative_to(run_dir)) for path in paths]
    manifest["selected_candidate_index"] = 0
    manifest["model_results"].append(_probe_record(result, "main_candidates", prompt, started))
    manifest["workflow_stage"] = "main_candidates"
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)
    return state


def select_main_candidate(state: dict[str, Any], index: int) -> dict[str, Any]:
    state = _ensure_state(state)
    candidates = state.get("main_candidates") or []
    if not candidates:
        raise ValueError("请先生成主视觉候选。")
    clamped = max(0, min(int(index), len(candidates) - 1))
    state["selected_candidate_index"] = clamped
    run_dir = Path(state["run_dir"])
    manifest = _read_manifest(run_dir)
    manifest["selected_candidate_index"] = clamped
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)
    return state


def generate_expression_pack(state: dict[str, Any], *, seed: int = 100) -> dict[str, Any]:
    state = _ensure_state(state)
    draft = state["draft"]
    run_dir = Path(state["run_dir"])
    expression_dir = run_dir / "expressions_raw"
    expression_dir.mkdir(parents=True, exist_ok=True)
    manifest = _read_manifest(run_dir)
    expression_assets: dict[str, str] = _existing_expression_assets(run_dir, manifest)

    with _remote_probe_context() as probe:
        for index, expression in enumerate(EXPRESSIONS):
            if expression in expression_assets and Path(expression_assets[expression]).exists():
                continue
            started = time.perf_counter()
            prompt = f"{_main_visual_prompt(draft)}, {EXPRESSION_PROMPTS[expression]}"
            result = probe(
                candidate_id=QWEN_CANDIDATE,
                prompt=prompt,
                batch_size=1,
                seed=seed + index,
                width=768,
                height=1024,
            )
            _raise_for_probe_failure(result)
            path = _write_image_payloads(expression_dir / expression, result.get("images", []), expected=1)[0]
            expression_assets[expression] = str(path)
            manifest["model_results"].append(_probe_record(result, f"expression_{expression}", prompt, started))
            manifest["expression_assets_raw"] = {
                key: str(Path(value).relative_to(run_dir)) for key, value in expression_assets.items()
            }
            manifest["workflow_stage"] = "expressions_complete" if set(EXPRESSIONS) <= set(expression_assets) else "expressions_partial"
            _touch_manifest(manifest)
            _write_manifest(manifest, run_dir)

    state["expression_assets"] = expression_assets
    manifest["expression_assets_raw"] = {
        key: str(Path(value).relative_to(run_dir)) for key, value in expression_assets.items()
    }
    manifest["workflow_stage"] = "expressions_complete" if set(EXPRESSIONS) <= set(expression_assets) else "expressions_partial"
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)
    return state


def generate_background(state: dict[str, Any], *, seed: int = 900) -> dict[str, Any]:
    state = _ensure_state(state)
    draft = state["draft"]
    run_dir = Path(state["run_dir"])
    manifest = _read_manifest(run_dir)
    existing = _existing_background(run_dir, manifest)
    if existing is not None:
        state["background_asset"] = str(existing)
        _sync_manifest_state(run_dir, state, manifest)
        return state

    started = time.perf_counter()
    prompt = _background_prompt(draft)
    result = _remote_probe(
        candidate_id=QWEN_CANDIDATE,
        prompt=prompt,
        batch_size=1,
        seed=seed,
        width=1344,
        height=768,
    )
    _raise_for_probe_failure(result)
    path = _write_image_payloads(run_dir / "background_raw", result.get("images", []), expected=1)[0]
    state["background_asset"] = str(path)
    manifest["background_raw"] = str(path.relative_to(run_dir))
    manifest["model_results"].append(_probe_record(result, "background", prompt, started))
    manifest["workflow_stage"] = "assets_ready" if set(EXPRESSIONS) <= set(state.get("expression_assets") or {}) else "background_ready"
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)
    return state


def matte_and_package_assets(state: dict[str, Any], *, mode: str = "rembg_isnet_anime") -> dict[str, Any]:
    state = _ensure_state(state)
    run_dir = Path(state["run_dir"])
    character_id = state["character_id"]
    draft = state["draft"]
    package_root = run_dir / "package"
    manifest = _read_manifest(run_dir)
    if _package_complete(package_root, character_id):
        state["package_dir"] = str(package_root)
        state["manifest_path"] = str(run_dir / "manifest.json")
        manifest["workflow_stage"] = "packaged"
        manifest["ready_for_chat"] = True
        _touch_manifest(manifest)
        _write_manifest(manifest, run_dir)
        return state

    character_dir = package_root / "assets" / "characters" / character_id
    background_dir = package_root / "assets" / "backgrounds"
    generated_dir = package_root / "generated"
    character_dir.mkdir(parents=True, exist_ok=True)
    background_dir.mkdir(parents=True, exist_ok=True)
    generated_dir.mkdir(parents=True, exist_ok=True)

    expression_assets = state.get("expression_assets") or {}
    if set(EXPRESSIONS) - set(expression_assets):
        raise ValueError("请先生成完整 8 表情资产。")

    packaged_assets = []
    for expression in EXPRESSIONS:
        source = Path(expression_assets[expression])
        image = Image.open(source).convert("RGBA")
        processed, matting_status = _matte_image(image, mode=mode)
        normalized = normalize_to_stage_canvas(processed)
        target = character_dir / f"{expression}.png"
        normalized.save(target)
        packaged_assets.append(
            {
                "slot": expression,
                "path": str(target.relative_to(package_root)),
                "source_path": str(source.relative_to(run_dir)),
                "matting_status": matting_status,
                "bytes": target.stat().st_size,
                "usable": True,
            }
        )

    background_source = Path(state["background_asset"]) if state.get("background_asset") else None
    background_target = background_dir / f"{character_id}_background.png"
    if background_source and background_source.exists():
        _fit_background(Image.open(background_source).convert("RGB")).save(background_target)
    else:
        _fallback_background(str(draft.get("display_name") or draft.get("name") or character_id)).save(background_target)

    package = dict(draft)
    package["metadata"] = {**package.get("metadata", {}), "source": "character_workshop", "generation_manifest": str(run_dir / "manifest.json")}
    package["visual"] = {**package.get("visual", {}), "avatar": character_id, "background_image": f"{character_id}_background"}
    character_json = package_root / "characters" / f"{character_id}.json"
    character_json.parent.mkdir(parents=True, exist_ok=True)
    _write_json(character_json, package)

    grid = generated_dir / "asset_grid.png"
    make_thumbnail_grid([character_dir / f"{slot}.png" for slot in EXPRESSIONS], grid)
    smoke = generated_dir / "stage_smoke.html"
    _write_stage_smoke(package, package_root, smoke)

    manifest["packaged_assets"] = packaged_assets
    manifest["background_asset"] = str(background_target.relative_to(package_root))
    manifest["character_package"] = str(character_json.relative_to(package_root))
    manifest["package_run_dir"] = str(package_root)
    manifest["asset_grid"] = str(grid.relative_to(package_root))
    manifest["stage_smoke"] = str(smoke.relative_to(package_root))
    manifest["ready_for_chat"] = True
    manifest["workflow_stage"] = "packaged"
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)
    write_report(manifest, package_root / "generated" / "report.md")
    state["package_dir"] = str(package_root)
    state["manifest_path"] = str(run_dir / "manifest.json")
    return state


def install_character_package(state: dict[str, Any]) -> dict[str, Any]:
    state = _ensure_state(state)
    package_dir = Path(state.get("package_dir") or Path(state["run_dir"]) / "package")
    character_id = state["character_id"]
    source_character_dir = package_dir / "assets" / "characters" / character_id
    source_background = package_dir / "assets" / "backgrounds" / f"{character_id}_background.png"
    source_json = package_dir / "characters" / f"{character_id}.json"
    if not source_character_dir.exists() or not source_json.exists():
        raise ValueError("请先完成打包预览。")

    target_character_dir = INSTALLED_CHARACTER_ROOT / character_id
    target_background = INSTALLED_BACKGROUND_ROOT / f"{character_id}_background.png"
    target_json = INSTALLED_CHARACTER_JSON_ROOT / f"{character_id}.json"
    shutil.copytree(source_character_dir, target_character_dir, dirs_exist_ok=True)
    target_background.parent.mkdir(parents=True, exist_ok=True)
    if source_background.exists():
        shutil.copy2(source_background, target_background)
    target_json.parent.mkdir(parents=True, exist_ok=True)
    shutil.copy2(source_json, target_json)

    manifest = _read_manifest(Path(state["run_dir"]))
    manifest["install_paths"] = {
        "character_assets": str(target_character_dir),
        "background": str(target_background),
        "character_json": str(target_json),
    }
    manifest["installed_at_unix"] = int(time.time())
    manifest["workflow_stage"] = "installed"
    _touch_manifest(manifest)
    _write_manifest(manifest, Path(state["run_dir"]))
    _clear_stage_caches()
    state["installed_character_id"] = character_id
    return state


def render_packaged_stage_preview(state: dict[str, Any]) -> str:
    state = _ensure_state(state)
    package_dir = Path(state.get("package_dir") or Path(state["run_dir"]) / "package")
    character_path = package_dir / "characters" / f"{state['character_id']}.json"
    if not character_path.exists():
        return ""
    character = json.loads(character_path.read_text(encoding="utf-8"))
    from src import stage_driver

    old_asset_root = stage_driver.ASSET_ROOT
    old_background_root = stage_driver.BACKGROUND_ROOT
    try:
        stage_driver.ASSET_ROOT = package_dir / "assets" / "characters"
        stage_driver.BACKGROUND_ROOT = package_dir / "assets" / "backgrounds"
        stage_driver._asset_data_uri.cache_clear()
        stage_driver._background_data_uri.cache_clear()
        return stage_driver.render_character_stage(
            character,
            {"expression": "smile", "motion": "talk", "intensity": 0.72},
        )
    finally:
        stage_driver.ASSET_ROOT = old_asset_root
        stage_driver.BACKGROUND_ROOT = old_background_root
        stage_driver._asset_data_uri.cache_clear()
        stage_driver._background_data_uri.cache_clear()


def set_remote_probe_for_tests(fn: Callable[..., dict[str, Any]] | None) -> None:
    global REMOTE_PROBE
    REMOTE_PROBE = fn


def _remote_probe(**kwargs: Any) -> dict[str, Any]:
    with _remote_probe_context() as probe:
        return probe(**kwargs)


@contextmanager
def _remote_probe_context():
    if REMOTE_PROBE is not None:
        yield REMOTE_PROBE
        return
    from modal_apps.modal_character_spike import CharacterGenerationSpike, app

    with app.run():
        yield CharacterGenerationSpike().probe.remote


def _write_image_payloads(output_dir: Path, images: list[bytes], *, expected: int) -> list[Path]:
    if len(images) < expected:
        raise ValueError(f"模型返回 {len(images)} 张图，期望 {expected} 张。")
    output_dir.mkdir(parents=True, exist_ok=True)
    paths = []
    for index, payload in enumerate(images[:expected]):
        path = output_dir / f"{index:02d}.png"
        path.write_bytes(payload)
        paths.append(path)
    return paths


def _matte_image(image: Image.Image, *, mode: str) -> tuple[Image.Image, str]:
    if mode != "rembg_isnet_anime":
        return image.convert("RGBA"), "fallback_keep_background"
    try:
        REMBG_MODEL_ROOT.mkdir(parents=True, exist_ok=True)
        os.environ.setdefault("U2NET_HOME", str(REMBG_MODEL_ROOT))
        from rembg import new_session, remove

        global _REMBG_SESSION
        if _REMBG_SESSION is None:
            _REMBG_SESSION = new_session("isnet-anime")
        buffer = io.BytesIO()
        image.convert("RGB").save(buffer, format="PNG")
        output = remove(buffer.getvalue(), session=_REMBG_SESSION)
        matte = Image.open(io.BytesIO(output)).convert("RGBA")
        if not _valid_alpha(matte):
            return image.convert("RGBA"), "fallback_keep_background"
        return matte, "rembg_isnet_anime"
    except Exception:
        return image.convert("RGBA"), "fallback_keep_background"


def _valid_alpha(image: Image.Image) -> bool:
    alpha = image.getchannel("A")
    bbox = alpha.getbbox()
    if bbox is None:
        return False
    non_zero = sum(1 for value in alpha.getdata() if value > 8)
    ratio = non_zero / (image.width * image.height)
    return 0.05 <= ratio <= 0.92


def _main_visual_prompt(draft: dict[str, Any]) -> str:
    name = str(draft.get("display_name") or draft.get("name") or "original character")
    description = " ".join(str(draft.get(key) or "").strip() for key in ("description", "personality", "scenario"))
    return (
        f"single original anime-style virtual character portrait for {name}, {description}, "
        "young adult original character, half body character sprite, centered composition, "
        "plain light background, clean silhouette, no text, no logo, no poster, not a landscape, "
        "not an existing commercial character"
    )


def _background_prompt(draft: dict[str, Any]) -> str:
    scenario = str(draft.get("scenario") or "quiet virtual communication room")
    return (
        f"empty background for a virtual character conversation stage, {scenario}, "
        "wide landscape image, no people, no character, no text, no logo, clean atmospheric sci-fi interior"
    )


def _new_manifest(draft: dict[str, Any], run_dir: Path, *, user: UserContext | None = None) -> dict[str, Any]:
    now = int(time.time())
    owner = {
        "username": user.username if user and user.authenticated else None,
        "authenticated": bool(user and user.authenticated),
    }
    return {
        "schema_version": 1,
        "run_type": "character_workshop",
        "character_id": draft["id"],
        "display_name": draft.get("display_name") or draft.get("name"),
        "created_at_unix": now,
        "updated_at_unix": now,
        "run_dir": str(run_dir),
        "draft_character": "draft_character.json",
        "model": QWEN_CANDIDATE,
        "model_results": [],
        "owner": owner,
        "workflow_stage": "draft",
        "stats_run_id": _hash_user_id(f"{run_dir}:{now}")[:16],
        "ready_for_chat": False,
    }


def _probe_record(result: dict[str, Any], case: str, prompt: str, started: float) -> dict[str, Any]:
    return {
        "candidate_id": result.get("candidate_id"),
        "benchmark_case": case,
        "status": result.get("status"),
        "image_count": result.get("image_count"),
        "duration_seconds": result.get("duration_seconds"),
        "client_wall_seconds": round(time.perf_counter() - started, 3),
        "prompt": prompt,
        "seed": result.get("seed"),
        "failure_reason": result.get("failure_reason"),
    }


def _raise_for_probe_failure(result: dict[str, Any]) -> None:
    if result.get("status") != "ok":
        reason = result.get("failure_reason") or "未知错误"
        raise RuntimeError(f"图像生成失败：{reason}")


def _ensure_state(state: dict[str, Any] | None) -> dict[str, Any]:
    if not state or not state.get("draft") or not state.get("run_dir"):
        raise ValueError("请先创建角色草案。")
    return dict(state)


def _ensure_draft_state(state: dict[str, Any] | None) -> dict[str, Any]:
    if not state or not state.get("draft"):
        raise ValueError("请先创建角色草案。")
    return dict(state)


def _unique_run_dir(character_id: str, *, user: UserContext | None = None) -> Path:
    root = user_workshop_root(user) if user and user.authenticated else WORKSHOP_ROOT
    return root / character_id / time.strftime("%Y%m%d_%H%M%S")


def _initialize_run_dir(run_dir: Path, draft: dict[str, Any], *, user: UserContext | None = None) -> None:
    run_dir.mkdir(parents=True, exist_ok=True)
    _write_json(run_dir / "draft_character.json", draft)
    manifest = _new_manifest(draft, run_dir, user=user)
    _write_manifest(manifest, run_dir)


def _read_manifest(run_dir: Path) -> dict[str, Any]:
    return json.loads((run_dir / "manifest.json").read_text(encoding="utf-8"))


def _write_manifest(manifest: dict[str, Any], run_dir: Path) -> None:
    _write_json(run_dir / "manifest.json", manifest)


def _touch_manifest(manifest: dict[str, Any]) -> None:
    manifest["updated_at_unix"] = int(time.time())


def _write_json(path: Path, payload: dict[str, Any]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")


def _state_from_manifest(run_dir: Path, manifest: dict[str, Any]) -> dict[str, Any]:
    draft_path = run_dir / str(manifest.get("draft_character") or "draft_character.json")
    draft = json.loads(draft_path.read_text(encoding="utf-8")) if draft_path.exists() else default_character_package(
        str(manifest.get("character_id") or "workshop_character"),
        str(manifest.get("display_name") or "工坊角色"),
    )
    character_id = slugify_identifier(str(draft.get("id") or manifest.get("character_id") or "workshop_character"))
    selected_index = int(manifest.get("selected_candidate_index") or 0)
    main_candidates = _existing_main_candidates(run_dir, manifest)
    expression_assets = _existing_expression_assets(run_dir, manifest)
    background = _existing_background(run_dir, manifest)
    package_dir = Path(str(manifest.get("package_run_dir") or run_dir / "package"))
    state = {
        "draft": draft,
        "character_id": character_id,
        "run_dir": str(run_dir),
        "main_candidates": [str(path) for path in main_candidates],
        "selected_candidate_index": selected_index if main_candidates else None,
        "expression_assets": expression_assets,
        "background_asset": str(background) if background else None,
        "manifest_path": str(run_dir / "manifest.json"),
        "installed_character_id": character_id if manifest.get("installed_at_unix") else None,
    }
    if package_dir.exists():
        state["package_dir"] = str(package_dir)
    return state


def _sync_manifest_state(run_dir: Path, state: dict[str, Any], manifest: dict[str, Any]) -> None:
    main_candidates = [Path(path) for path in state.get("main_candidates") or [] if Path(path).exists()]
    if main_candidates:
        manifest["main_candidates"] = [str(path.relative_to(run_dir)) for path in main_candidates]
        manifest["selected_candidate_index"] = int(state.get("selected_candidate_index") or 0)
    expression_assets = {key: value for key, value in (state.get("expression_assets") or {}).items() if Path(value).exists()}
    if expression_assets:
        manifest["expression_assets_raw"] = {
            key: str(Path(value).relative_to(run_dir)) for key, value in expression_assets.items()
        }
    if state.get("background_asset") and Path(state["background_asset"]).exists():
        manifest["background_raw"] = str(Path(state["background_asset"]).relative_to(run_dir))
    manifest["workflow_stage"] = _workflow_stage(state, manifest)
    _touch_manifest(manifest)
    _write_manifest(manifest, run_dir)


def _existing_main_candidates(run_dir: Path, manifest: dict[str, Any]) -> list[Path]:
    paths = []
    for value in manifest.get("main_candidates") or []:
        path = _resolve_run_path(run_dir, value)
        if path.exists():
            paths.append(path)
    if paths:
        return paths
    return sorted((run_dir / "main_candidates").glob("*.png"))


def _existing_expression_assets(run_dir: Path, manifest: dict[str, Any]) -> dict[str, str]:
    assets = {}
    raw = manifest.get("expression_assets_raw") or {}
    for expression in EXPRESSIONS:
        value = raw.get(expression)
        path = _resolve_run_path(run_dir, value) if value else run_dir / "expressions_raw" / expression / "00.png"
        if path.exists():
            assets[expression] = str(path)
    return assets


def _existing_background(run_dir: Path, manifest: dict[str, Any]) -> Path | None:
    value = manifest.get("background_raw")
    path = _resolve_run_path(run_dir, value) if value else run_dir / "background_raw" / "00.png"
    return path if path.exists() else None


def _package_complete(package_root: Path, character_id: str) -> bool:
    character_dir = package_root / "assets" / "characters" / character_id
    background = package_root / "assets" / "backgrounds" / f"{character_id}_background.png"
    character_json = package_root / "characters" / f"{character_id}.json"
    return (
        character_json.exists()
        and background.exists()
        and all((character_dir / f"{expression}.png").exists() for expression in EXPRESSIONS)
    )


def _workflow_stage(state: dict[str, Any], manifest: dict[str, Any]) -> str:
    if manifest.get("installed_at_unix"):
        return "installed"
    character_id = str(state.get("character_id") or manifest.get("character_id") or "")
    package_root = Path(str(state.get("package_dir") or manifest.get("package_run_dir") or Path(state["run_dir"]) / "package"))
    if character_id and _package_complete(package_root, character_id):
        return "packaged"
    expressions = state.get("expression_assets") or {}
    background = state.get("background_asset")
    if set(EXPRESSIONS) <= set(expressions) and background and Path(background).exists():
        return "assets_ready"
    if expressions:
        return "expressions_partial"
    if len(state.get("main_candidates") or []) >= 4:
        return "main_candidates"
    return "draft"


def _next_step_label(stage: str) -> str:
    return {
        "draft": "生成主视觉",
        "main_candidates": "生成8表情",
        "expressions_partial": "补齐表情",
        "assets_ready": "打包预览",
        "packaged": "安装角色",
        "installed": "已安装",
    }.get(stage, "继续")


def _resolve_run_path(run_dir: Path, value: Any) -> Path:
    if not value:
        return run_dir / "__missing__"
    path = Path(str(value))
    return path if path.is_absolute() else run_dir / path


def _is_relative_to(path: Path, root: Path) -> bool:
    try:
        path.relative_to(root)
        return True
    except ValueError:
        return False


def _profile_value(profile: Any, key: str) -> str:
    if profile is None:
        return ""
    if isinstance(profile, dict):
        return str(profile.get(key) or "").strip()
    return str(getattr(profile, key, "") or "").strip()


def _hash_user_id(value: str) -> str:
    return hashlib.sha256(str(value).encode("utf-8")).hexdigest()


def _file_path(file: Any) -> Path | None:
    if file is None:
        return None
    if isinstance(file, (str, Path)):
        return Path(file)
    if isinstance(file, dict):
        value = file.get("path") or file.get("name")
        return Path(value) if value else None
    value = getattr(file, "path", None) or getattr(file, "name", None)
    return Path(value) if value else None


def _split_tags(value: str) -> list[str]:
    text = str(value or "")
    for separator in ("，", "、", ";", "；", "\n"):
        text = text.replace(separator, ",")
    return [item.strip() for item in text.split(",") if item.strip()]


def _summary(text: str, limit: int = 120) -> str:
    compact = " ".join(text.split())
    return compact if len(compact) <= limit else compact[: limit - 1].rstrip() + "…"


def _first_line(text: str) -> str:
    for line in text.splitlines():
        if line.strip():
            return line.strip()
    return text.strip()


def _fit_background(image: Image.Image) -> Image.Image:
    image = image.convert("RGB")
    target = (1600, 900)
    image.thumbnail(target, Image.Resampling.LANCZOS)
    canvas = Image.new("RGB", target, (12, 18, 31))
    canvas.paste(image, ((target[0] - image.width) // 2, (target[1] - image.height) // 2))
    return canvas


def _fallback_background(display_name: str) -> Image.Image:
    from src.character_spike.assets import _draw_mock_background

    return _draw_mock_background(display_name, __import__("random").Random(42))


def _write_stage_smoke(character: dict[str, Any], package_root: Path, output: Path) -> None:
    from src import stage_driver

    old_asset_root = stage_driver.ASSET_ROOT
    old_background_root = stage_driver.BACKGROUND_ROOT
    try:
        stage_driver.ASSET_ROOT = package_root / "assets" / "characters"
        stage_driver.BACKGROUND_ROOT = package_root / "assets" / "backgrounds"
        stage_driver._asset_data_uri.cache_clear()
        stage_driver._background_data_uri.cache_clear()
        states = [
            {"expression": "idle", "motion": "breathe", "intensity": 0.35},
            {"expression": "listening", "motion": "gentle_blink", "intensity": 0.35},
            {"expression": "smile", "motion": "talk", "intensity": 0.72},
            {"expression": "thinking", "motion": "focus", "intensity": 0.7},
        ]
        html = "<!doctype html><meta charset='utf-8'><body style='margin:0;background:#020617'>"
        html += "\n".join(stage_driver.render_character_stage(character, state) for state in states)
        html += "</body>"
        output.parent.mkdir(parents=True, exist_ok=True)
        output.write_text(html, encoding="utf-8")
    finally:
        stage_driver.ASSET_ROOT = old_asset_root
        stage_driver.BACKGROUND_ROOT = old_background_root
        stage_driver._asset_data_uri.cache_clear()
        stage_driver._background_data_uri.cache_clear()


def _clear_stage_caches() -> None:
    try:
        from src import stage_driver

        stage_driver._asset_data_uri.cache_clear()
        stage_driver._background_data_uri.cache_clear()
    except Exception:
        pass