"""Opt-in local development debug persist. Mapping labels and secrets stay out."""
from __future__ import annotations

import json
import logging
from datetime import datetime, timezone
from typing import Any
import uuid

from db import get_db, row_to_dict
from version import APP_VERSION, BUILD_DATE

SETTING_KEY = "debug.persist_traces"
EXPORT_KIND = "kansho.debug_export"
EXPORT_VERSION = 2
UNASSIGNED_SPACE_TITLE = "Ohne Space"
UNASSIGNED_DAY_LABEL = "Ohne Tag"
FORBIDDEN_KEYS = frozenset(
    {
        "local_label",
        "demask_label",
        "mapping_table",
        "replacements",
        "restore_by_token",
        "password",
        "password_hash",
        "key",
        "api_key",
        "secret",
        "token",
    }
)
LAYER_FOR_PURPOSE = {
    "dialogue_turn": "dialogzug",
    "journal_generate": "journalentwurf",
    "local_source_artifact": "journalquellen",
    "journal_reconstruct": "journalrekonstruktion",
    "profile_review": "profilreview",
}
SANITIZE_MAX_DEPTH = 80
LOGGER = logging.getLogger("kansho.debug")


def _now() -> str:
    return datetime.now(timezone.utc).replace(microsecond=0).isoformat()


def persist_enabled() -> bool:
    with get_db() as conn:
        row = row_to_dict(
            conn.execute("SELECT value FROM app_settings WHERE key = ?", (SETTING_KEY,)).fetchone()
        )
    return (row or {}).get("value") == "1"


def set_persist_enabled(enabled: bool) -> dict:
    value = "1" if enabled else "0"
    with get_db() as conn:
        conn.execute(
            """
            INSERT INTO app_settings (key, value, updated)
            VALUES (?, ?, datetime('now'))
            ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated = datetime('now')
            """,
            (SETTING_KEY, value),
        )
    return settings_payload()


def _is_admin(profile_id: str) -> bool:
    with get_db() as conn:
        row = row_to_dict(
            conn.execute("SELECT role FROM profiles WHERE id = ?", (profile_id,)).fetchone()
        )
    return (row or {}).get("role") == "admin"


def should_persist(profile_id: str | None) -> bool:
    if not profile_id:
        return False
    return persist_enabled() and _is_admin(profile_id)


def sanitize(value: Any, *, _stack: set[int] | None = None, _depth: int = 0) -> Any:
    if _depth > SANITIZE_MAX_DEPTH:
        return None
    if isinstance(value, (dict, list, tuple)):
        stack = _stack if _stack is not None else set()
        ident = id(value)
        if ident in stack:
            return None
        stack.add(ident)
        try:
            if isinstance(value, dict):
                cleaned = {}
                for key, item in value.items():
                    if key in FORBIDDEN_KEYS:
                        continue
                    cleaned[key] = sanitize(item, _stack=stack, _depth=_depth + 1)
                return cleaned
            return [sanitize(item, _stack=stack, _depth=_depth + 1) for item in value]
        finally:
            stack.discard(ident)
    return value


def settings_payload(profile_id: str | None = None) -> dict:
    enabled = persist_enabled()
    count = 0
    if profile_id:
        with get_db() as conn:
            count = conn.execute(
                "SELECT COUNT(*) AS n FROM debug_runs WHERE profile_id = ?",
                (profile_id,),
            ).fetchone()["n"]
    return {
        "persist_enabled": enabled,
        "run_count": count,
        "note": (
            "Entwicklungsoption. Speichert die Admin-Testspur lokal je Dialogschritt. "
            "Zuordnung Space / Tag / Gespräch. Mapping-Tabelle, Secrets und Klarnamen-Labels "
            "bleiben ausgeschlossen. Nur Aktionen des Admin-Profils. Default aus."
        ),
    }


def resolve_placement(
    profile_id: str,
    *,
    conversation_id: str | None = None,
    journal_day_id: str | None = None,
    space_id: str | None = None,
) -> dict:
    place = {
        "space_id": space_id or None,
        "journal_day_id": journal_day_id or None,
        "conversation_id": conversation_id or None,
        "space_title": "",
        "calendar_date": "",
        "conversation_title": "",
    }
    with get_db() as conn:
        if conversation_id:
            conv = row_to_dict(
                conn.execute(
                    """
                    SELECT id, title, space_id, journal_day_id
                    FROM conversations
                    WHERE id = ? AND profile_id = ?
                    """,
                    (conversation_id, profile_id),
                ).fetchone()
            )
            if conv:
                place["conversation_id"] = conv["id"]
                place["conversation_title"] = conv.get("title") or ""
                place["space_id"] = place["space_id"] or conv.get("space_id")
                place["journal_day_id"] = place["journal_day_id"] or conv.get("journal_day_id")
        if place["journal_day_id"]:
            day = row_to_dict(
                conn.execute(
                    """
                    SELECT id, calendar_date, space_id
                    FROM journal_days
                    WHERE id = ? AND profile_id = ?
                    """,
                    (place["journal_day_id"], profile_id),
                ).fetchone()
            )
            if day:
                place["calendar_date"] = day.get("calendar_date") or ""
                place["space_id"] = place["space_id"] or day.get("space_id")
        if place["space_id"]:
            space = row_to_dict(
                conn.execute(
                    """
                    SELECT id, title FROM spaces
                    WHERE id = ? AND profile_id = ?
                    """,
                    (place["space_id"], profile_id),
                ).fetchone()
            )
            if space:
                place["space_title"] = space.get("title") or ""
    return place


def persist_step(
    profile_id: str,
    *,
    purpose: str,
    status: str = "ok",
    layer: str = "",
    subject_type: str = "",
    subject_id: str = "",
    conversation_id: str | None = None,
    message_id: str | None = None,
    journal_day_id: str | None = None,
    space_id: str | None = None,
    decision: dict | None = None,
    trace: dict | None = None,
    extra: dict | None = None,
) -> str | None:
    if not should_persist(profile_id):
        return None
    if not journal_day_id and subject_type == "journal_day" and subject_id:
        journal_day_id = subject_id
    place = resolve_placement(
        profile_id,
        conversation_id=conversation_id,
        journal_day_id=journal_day_id,
        space_id=space_id,
    )
    payload = sanitize(
        {
            "decision": decision,
            "trace": trace,
            **(extra or {}),
        }
    )
    run_id = str(uuid.uuid4())
    with get_db() as conn:
        conn.execute(
            """
            INSERT INTO debug_runs (
              id, profile_id, purpose, layer, status,
              subject_type, subject_id, conversation_id, message_id,
              space_id, journal_day_id, space_title, calendar_date, conversation_title,
              payload_json
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            """,
            (
                run_id,
                profile_id,
                purpose,
                layer or LAYER_FOR_PURPOSE.get(purpose, ""),
                status,
                subject_type or "",
                subject_id or "",
                place["conversation_id"],
                message_id,
                place["space_id"],
                place["journal_day_id"],
                place["space_title"],
                place["calendar_date"],
                place["conversation_title"],
                json.dumps(payload, ensure_ascii=False, default=str),
            ),
        )
    return run_id


def persist_engine_error(
    profile_id: str,
    *,
    purpose: str,
    exc,
    layer: str = "",
    subject_type: str = "",
    subject_id: str = "",
    conversation_id: str | None = None,
    journal_day_id: str | None = None,
    extra: dict | None = None,
) -> str | None:
    try:
        diag = dict(getattr(exc, "diagnostics", None) or {})
        merged = dict(extra or {})
        merged.setdefault("code", getattr(exc, "code", None))
        merged.setdefault("message", getattr(exc, "message", None) or str(exc))
        log = diag.get("log")
        if log is not None:
            merged.setdefault("run_log", list(log) if isinstance(log, list) else log)
        trace = diag.get("trace") if isinstance(diag.get("trace"), dict) else {}
        try:
            from privacy_gateway import compact_diagnostics, public_cost_report

            compact = compact_diagnostics({**diag, **trace, **merged})
            for key, value in compact.items():
                merged.setdefault(key, value)
            merged.setdefault("cost_report", public_cost_report({**diag, **merged}))
        except Exception:
            LOGGER.exception("Kompakte Fehlerdiagnose konnte nicht erzeugt werden.")
        for key in (
            "generation_selection",
            "style_application",
            "abort_reason",
            "detect_attempts",
            "detect_passes",
            "detect_partial_discarded",
            "contract_violation",
            "invalid_entity_type",
            "omitted_non_identity_types",
            "generate_called",
        ):
            if merged.get(key) is None:
                if diag.get(key) is not None:
                    merged[key] = diag.get(key)
                elif trace.get(key) is not None:
                    merged[key] = trace.get(key)
        merged.setdefault("generate_called", False)
        return persist_step(
            profile_id,
            purpose=purpose,
            status="error",
            layer=layer,
            subject_type=subject_type,
            subject_id=subject_id,
            conversation_id=conversation_id,
            journal_day_id=journal_day_id,
            trace=trace or None,
            extra=merged,
        )
    except Exception:
        LOGGER.exception(
            "Diagnosepersistenz fehlgeschlagen; ursprünglicher Fehler bleibt %s",
            getattr(exc, "code", type(exc).__name__),
        )
        return None


def _parse_payload(raw: str | None) -> dict:
    if not raw:
        return {}
    try:
        data = json.loads(raw)
    except json.JSONDecodeError:
        return {}
    return data if isinstance(data, dict) else {}


def _row_public(row: dict, *, include_payload: bool = True) -> dict:
    payload = _parse_payload(row.get("payload_json"))
    item = {
        "id": row["id"],
        "created": row["created"],
        "purpose": row["purpose"],
        "layer": row["layer"],
        "status": row["status"],
        "subject_type": row.get("subject_type") or "",
        "subject_id": row.get("subject_id") or "",
        "conversation_id": row.get("conversation_id"),
        "message_id": row.get("message_id"),
        "space_id": row.get("space_id"),
        "journal_day_id": row.get("journal_day_id"),
        "space_title": row.get("space_title") or "",
        "calendar_date": row.get("calendar_date") or "",
        "conversation_title": row.get("conversation_title") or "",
        "decision": payload.get("decision"),
        "summary": _summary(row, payload),
    }
    if include_payload:
        item["payload"] = payload
        item["trace"] = payload.get("trace")
        item["run_log"] = payload.get("run_log") or ((payload.get("trace") or {}).get("log"))
    return item


def _summary(row: dict, payload: dict) -> str:
    decision = payload.get("decision") or {}
    label = decision.get("label") or decision.get("operation") or ""
    purpose = row.get("purpose") or ""
    status = row.get("status") or ""
    parts = [purpose]
    if label:
        parts.append(str(label))
    if status and status != "ok":
        parts.append(status)
    code = payload.get("code")
    if code:
        parts.append(str(code))
    return " · ".join(parts)


def list_runs(profile_id: str, *, limit: int = 200) -> list[dict]:
    capped = max(1, min(int(limit or 200), 500))
    with get_db() as conn:
        rows = [
            dict(item)
            for item in conn.execute(
                """
                SELECT * FROM debug_runs
                WHERE profile_id = ?
                ORDER BY created DESC, id DESC
                LIMIT ?
                """,
                (profile_id, capped),
            ).fetchall()
        ]
    return [_row_public(row, include_payload=False) for row in rows]


def latest_run(
    profile_id: str,
    *,
    journal_day_id: str | None = None,
    purpose: str | None = None,
) -> dict | None:
    clauses = ["profile_id = ?"]
    args: list[Any] = [profile_id]
    if journal_day_id:
        clauses.append("journal_day_id = ?")
        args.append(journal_day_id)
    if purpose:
        clauses.append("purpose = ?")
        args.append(purpose)
    with get_db() as conn:
        row = row_to_dict(
            conn.execute(
                f"""
                SELECT * FROM debug_runs
                WHERE {' AND '.join(clauses)}
                ORDER BY created DESC, id DESC
                LIMIT 1
                """,
                args,
            ).fetchone()
        )
    if not row:
        return None
    items = _fill_placement(profile_id, [_row_public(row, include_payload=True)])
    return items[0] if items else None


def get_run(profile_id: str, run_id: str) -> dict | None:
    with get_db() as conn:
        row = row_to_dict(
            conn.execute(
                "SELECT * FROM debug_runs WHERE id = ? AND profile_id = ?",
                (run_id, profile_id),
            ).fetchone()
        )
    if not row:
        return None
    items = _fill_placement(profile_id, [_row_public(row, include_payload=True)])
    return items[0]


def delete_run(profile_id: str, run_id: str) -> bool:
    with get_db() as conn:
        cursor = conn.execute(
            "DELETE FROM debug_runs WHERE id = ? AND profile_id = ?",
            (run_id, profile_id),
        )
        return cursor.rowcount > 0


def clear_runs(profile_id: str) -> int:
    with get_db() as conn:
        cursor = conn.execute("DELETE FROM debug_runs WHERE profile_id = ?", (profile_id,))
        return cursor.rowcount


def list_runs_full(profile_id: str) -> list[dict]:
    with get_db() as conn:
        rows = [
            dict(item)
            for item in conn.execute(
                """
                SELECT * FROM debug_runs
                WHERE profile_id = ?
                ORDER BY created ASC, id ASC
                """,
                (profile_id,),
            ).fetchall()
        ]
    items = [_row_public(row, include_payload=True) for row in rows]
    return _fill_placement(profile_id, items)


def _fill_placement(profile_id: str, items: list[dict]) -> list[dict]:
    missing_conv = [
        item.get("conversation_id")
        for item in items
        if item.get("conversation_id") and not item.get("space_id") and not item.get("journal_day_id")
    ]
    missing_days = [
        item.get("journal_day_id")
        for item in items
        if item.get("journal_day_id") and not item.get("space_id")
    ]
    conv_ids = list(dict.fromkeys(missing_conv))
    day_ids = list(dict.fromkeys(missing_days))
    convs: dict[str, dict] = {}
    days: dict[str, dict] = {}
    spaces: dict[str, dict] = {}
    with get_db() as conn:
        if conv_ids:
            marks = ",".join("?" * len(conv_ids))
            for row in conn.execute(
                f"SELECT id, title, space_id, journal_day_id FROM conversations WHERE profile_id = ? AND id IN ({marks})",
                [profile_id, *conv_ids],
            ):
                convs[row["id"]] = dict(row)
                if row["journal_day_id"]:
                    day_ids.append(row["journal_day_id"])
        day_ids = list(dict.fromkeys(day_ids))
        if day_ids:
            marks = ",".join("?" * len(day_ids))
            for row in conn.execute(
                f"SELECT id, calendar_date, space_id FROM journal_days WHERE profile_id = ? AND id IN ({marks})",
                [profile_id, *day_ids],
            ):
                days[row["id"]] = dict(row)
        space_ids = [
            item
            for item in (
                [row.get("space_id") for row in convs.values()]
                + [row.get("space_id") for row in days.values()]
                + [item.get("space_id") for item in items]
            )
            if item
        ]
        space_ids = list(dict.fromkeys(space_ids))
        if space_ids:
            marks = ",".join("?" * len(space_ids))
            for row in conn.execute(
                f"SELECT id, title FROM spaces WHERE profile_id = ? AND id IN ({marks})",
                [profile_id, *space_ids],
            ):
                spaces[row["id"]] = dict(row)
    for item in items:
        conv = convs.get(item.get("conversation_id") or "")
        if conv:
            item["conversation_title"] = item.get("conversation_title") or conv.get("title") or ""
            item["space_id"] = item.get("space_id") or conv.get("space_id")
            item["journal_day_id"] = item.get("journal_day_id") or conv.get("journal_day_id")
        day = days.get(item.get("journal_day_id") or "")
        if day:
            item["calendar_date"] = item.get("calendar_date") or day.get("calendar_date") or ""
            item["space_id"] = item.get("space_id") or day.get("space_id")
        space = spaces.get(item.get("space_id") or "")
        if space:
            item["space_title"] = item.get("space_title") or space.get("title") or ""
    return items


def _export_run(item: dict) -> dict:
    return {
        "id": item["id"],
        "created": item["created"],
        "purpose": item["purpose"],
        "layer": item["layer"],
        "status": item["status"],
        "subject_type": item["subject_type"],
        "subject_id": item["subject_id"],
        "conversation_id": item.get("conversation_id"),
        "message_id": item.get("message_id"),
        "space_id": item.get("space_id"),
        "journal_day_id": item.get("journal_day_id"),
        "space_title": item.get("space_title") or "",
        "calendar_date": item.get("calendar_date") or "",
        "conversation_title": item.get("conversation_title") or "",
        "summary": item["summary"],
        **(item.get("payload") or {}),
    }


def _step_summary(item: dict) -> dict:
    return {
        "id": item["id"],
        "created": item["created"],
        "purpose": item["purpose"],
        "layer": item["layer"],
        "status": item["status"],
        "summary": item["summary"],
        "message_id": item.get("message_id"),
    }


def _filter_runs(
    runs: list[dict],
    *,
    conversation_id: str | None = None,
    journal_day_id: str | None = None,
    space_id: str | None = None,
    purpose: str | None = None,
) -> list[dict]:
    selected = runs
    if conversation_id:
        selected = [
            item
            for item in selected
            if item.get("conversation_id") == conversation_id and item.get("purpose") != "journal_generate"
        ]
    elif journal_day_id:
        selected = [item for item in selected if item.get("journal_day_id") == journal_day_id]
    if space_id:
        selected = [item for item in selected if item.get("space_id") == space_id]
    if purpose:
        selected = [item for item in selected if item.get("purpose") == purpose]
    return selected


def group_tree(runs: list[dict], *, include_payload: bool = False) -> list[dict]:
    spaces_map: dict[str, dict] = {}
    space_order: list[str] = []
    for run in runs:
        exported = _export_run(run) if include_payload else _step_summary(run)
        sid = run.get("space_id") or ""
        space_key = sid or "_unassigned"
        if space_key not in spaces_map:
            spaces_map[space_key] = {
                "id": sid or None,
                "title": run.get("space_title") or (UNASSIGNED_SPACE_TITLE if not sid else ""),
                "days_map": {},
                "day_order": [],
            }
            space_order.append(space_key)
        space = spaces_map[space_key]
        if run.get("space_title") and not space["title"]:
            space["title"] = run.get("space_title")
        did = run.get("journal_day_id") or ""
        day_key = did or "_unassigned"
        if day_key not in space["days_map"]:
            space["days_map"][day_key] = {
                "id": did or None,
                "calendar_date": run.get("calendar_date") or (UNASSIGNED_DAY_LABEL if not did else ""),
                "conversations_map": {},
                "conversation_order": [],
                "generates": [],
            }
            space["day_order"].append(day_key)
        day = space["days_map"][day_key]
        if run.get("calendar_date") and (not day["calendar_date"] or day["calendar_date"] == UNASSIGNED_DAY_LABEL):
            day["calendar_date"] = run.get("calendar_date")
        if run.get("purpose") == "journal_generate":
            day["generates"].append(exported)
            continue
        cid = run.get("conversation_id") or ""
        conv_key = cid or "_none"
        if conv_key not in day["conversations_map"]:
            day["conversations_map"][conv_key] = {
                "id": cid or None,
                "title": run.get("conversation_title") or "Gespräch",
                "steps": [],
            }
            day["conversation_order"].append(conv_key)
        conv = day["conversations_map"][conv_key]
        if run.get("conversation_title"):
            conv["title"] = run.get("conversation_title")
        conv["steps"].append(exported)
    spaces = []
    for space_key in space_order:
        space = spaces_map[space_key]
        days = []
        for day_key in space["day_order"]:
            day = space["days_map"][day_key]
            conversations = []
            for conv_key in day["conversation_order"]:
                conv = day["conversations_map"][conv_key]
                conversations.append(
                    {
                        "id": conv["id"],
                        "title": conv["title"] or "Gespräch",
                        "step_count": len(conv["steps"]),
                        "steps": conv["steps"],
                    }
                )
            days.append(
                {
                    "id": day["id"],
                    "calendar_date": day["calendar_date"] or UNASSIGNED_DAY_LABEL,
                    "conversations": conversations,
                    "generates": day["generates"],
                }
            )
        spaces.append({"id": space["id"], "title": space["title"] or UNASSIGNED_SPACE_TITLE, "days": days})
    return spaces


def debug_tree(profile_id: str) -> dict:
    runs = list_runs_full(profile_id)
    return {"spaces": group_tree(runs, include_payload=False), "run_count": len(runs)}


def export_document(
    profile_id: str,
    *,
    conversation_id: str | None = None,
    journal_day_id: str | None = None,
    purpose: str | None = None,
) -> dict:
    runs = list_runs_full(profile_id)
    selected = _filter_runs(
        runs,
        conversation_id=conversation_id,
        journal_day_id=journal_day_id,
        purpose=purpose,
    )
    scope = "all"
    if purpose == "journal_generate":
        scope = "journal_generate"
    elif conversation_id:
        scope = "conversation"
    elif journal_day_id:
        scope = "day"
    spaces = group_tree(selected, include_payload=True)
    first_space = spaces[0] if spaces else None
    first_day = ((first_space or {}).get("days") or [None])[0] if first_space else None
    first_conv = ((first_day or {}).get("conversations") or [None])[0] if first_day else None
    return {
        "kind": EXPORT_KIND,
        "version": EXPORT_VERSION,
        "exported_at": _now(),
        "app_version": APP_VERSION,
        "build_date": BUILD_DATE,
        "scope": scope,
        "note": (
            "Lokale Entwicklungsdiagnose, gegliedert nach Space / Tag / Gespräch / Schritt. "
            "Mapping-Tabelle und Secrets sind ausgeschlossen. "
            "Enthält Klartext-Vorlagen (intern) und maskierten Egress des eigenen Admin-Profils. "
            "Nicht an Provider senden, außer bewusst zur lokalen Auswertung."
        ),
        "persist_enabled": persist_enabled(),
        "run_count": len(selected),
        "space": {"id": (first_space or {}).get("id"), "title": (first_space or {}).get("title")} if scope != "all" else None,
        "day": (
            {"id": (first_day or {}).get("id"), "calendar_date": (first_day or {}).get("calendar_date")}
            if scope in {"conversation", "day", "journal_generate"}
            else None
        ),
        "conversation": (
            {"id": (first_conv or {}).get("id"), "title": (first_conv or {}).get("title")}
            if scope == "conversation"
            else None
        ),
        "spaces": spaces,
        "runs": [_export_run(item) for item in selected],
    }


def _fence(text: str | None) -> str:
    body = (text or "").replace("```", "'''")
    return f"```\n{body}\n```" if body.strip() else "_leer_"


def _kv(title: str, value: Any) -> str:
    if value is None or value == "":
        return f"- {title}: nicht verfügbar"
    if isinstance(value, (dict, list)):
        return f"- {title}: `{json.dumps(value, ensure_ascii=False)}`"
    return f"- {title}: {value}"


def _render_trace_markdown(trace: dict | None, heading: str) -> list[str]:
    if not trace:
        return [f"### {heading}", "", "_keine Testspur_", ""]
    lines = [f"### {heading}", ""]
    lines.append(_kv("Zweck", trace.get("purpose")))
    lines.append(_kv("Schicht", trace.get("layer")))
    lines.append(_kv("Prompt", trace.get("prompt_slug")))
    lines.append(_kv("Prompt-Revision", trace.get("prompt_revision")))
    lines.append(_kv("Provider", trace.get("provider")))
    lines.append(_kv("Modell", trace.get("model")))
    lines.append(_kv("Detect", trace.get("detect_note") or trace.get("detect_provider")))
    lines.append(_kv("Detect-Modell", trace.get("detect_model")))
    lines.append(_kv("Abbruchgrund", trace.get("abort_reason")))
    lines.append(_kv("Modelltext übernommen", trace.get("model_text_accepted")))
    budget = trace.get("budget") or {}
    if budget:
        lines.append(_kv("Prompt-Tokens", budget.get("prompt_tokens")))
        lines.append(_kv("Completion-Tokens", budget.get("completion_tokens")))
        lines.append(_kv("Kosten", budget.get("cost")))
        lines.append(_kv("Generate-ms", budget.get("generate_ms") or trace.get("generate_ms")))
    lines.extend(["", "#### Intern (Klartext-Vorlage, nicht gesendet)", "", _fence(trace.get("intern")), ""])
    lines.extend(["#### Egress (maskiert, gesendet)", "", _fence(trace.get("egress")), ""])
    lines.extend(["#### Maskierung, Eingabe", "", _fence(trace.get("mask_input")), ""])
    lines.extend(["#### Modellantwort roh", "", _fence(trace.get("raw")), ""])
    lines.extend(["#### Lokal demaskiert", "", _fence(trace.get("reply")), ""])
    stored = "\n\n".join(part for part in (trace.get("stored_title"), trace.get("stored_body")) if part)
    if stored:
        lines.extend(["#### Gespeicherter Entwurf", "", _fence(stored), ""])
    if trace.get("source_preview"):
        lines.extend(["#### Lokale Quellenansicht", "", _fence(trace.get("source_preview")), ""])
    return lines


def render_markdown(document: dict) -> str:
    lines = [
        "# Kanshō Debug-Export",
        "",
        _kv("kind", document.get("kind")),
        _kv("version", document.get("version")),
        _kv("scope", document.get("scope")),
        _kv("exported_at", document.get("exported_at")),
        _kv("app_version", document.get("app_version")),
        _kv("build_date", document.get("build_date")),
        _kv("run_count", document.get("run_count")),
        _kv("persist_enabled", document.get("persist_enabled")),
        "",
        document.get("note") or "",
        "",
        "Gliederung: Space / Tag / Gespräch / Schritt. Die Schritte eines Gesprächs sind chronologisch.",
        "",
    ]
    if (document.get("space") or {}).get("title"):
        lines.append(_kv("Space", (document.get("space") or {}).get("title")))
    if (document.get("day") or {}).get("calendar_date"):
        lines.append(_kv("Tag", (document.get("day") or {}).get("calendar_date")))
    if (document.get("conversation") or {}).get("title"):
        lines.append(_kv("Gespräch", (document.get("conversation") or {}).get("title")))
        lines.append("")
    spaces = document.get("spaces") or []
    if spaces:
        for space in spaces:
            lines.extend(["---", "", f"# Space: {space.get('title') or UNASSIGNED_SPACE_TITLE}", ""])
            for day in space.get("days") or []:
                lines.extend([f"## Tag: {day.get('calendar_date') or UNASSIGNED_DAY_LABEL}", ""])
                for conv in day.get("conversations") or []:
                    lines.extend([f"### Gespräch: {conv.get('title') or 'Gespräch'}", ""])
                    for index, run in enumerate(conv.get("steps") or [], start=1):
                        lines.extend(_render_run_markdown(run, index))
                for index, run in enumerate(day.get("generates") or [], start=1):
                    lines.extend([f"### Journalentwurf {index}", ""])
                    lines.extend(_render_run_markdown(run, index))
    else:
        for index, run in enumerate(document.get("runs") or [], start=1):
            lines.extend(_render_run_markdown(run, index))
    lines.append("")
    return "\n".join(lines)


def _render_run_markdown(run: dict, index: int) -> list[str]:
    created = run.get("created") or ""
    purpose = run.get("purpose") or ""
    status = run.get("status") or ""
    lines = [
        "---",
        "",
        f"#### {index}. {purpose} · {created} · {status}",
        "",
        _kv("id", run.get("id")),
        _kv("layer", run.get("layer")),
        _kv("conversation_id", run.get("conversation_id")),
        _kv("code", run.get("code")),
    ]
    decision = run.get("decision")
    if decision:
        lines.append(_kv("Operation", decision.get("label") or decision.get("operation")))
        if decision.get("guard"):
            lines.append(_kv("Guard", decision.get("guard")))
    user = run.get("user") or {}
    assistant = run.get("assistant") or {}
    if user.get("body"):
        lines.extend(["", "##### Nutzer", "", _fence(user.get("body")), ""])
    if assistant.get("body"):
        lines.extend(["##### Antwort", "", _fence(assistant.get("body")), ""])
    traces = []
    if run.get("call_traces"):
        traces = list(run.get("call_traces") or [])
    elif run.get("trace"):
        nested = (run.get("trace") or {}).get("stages")
        traces = list(nested) if nested else [run.get("trace")]
    if not traces and run.get("trace"):
        traces = [run.get("trace")]
    for offset, stage in enumerate(traces):
        title = f"Schritt {offset + 1}"
        if isinstance(stage, dict) and stage.get("purpose"):
            title = f"Schritt {offset + 1}: {stage.get('purpose')}"
        lines.extend(_render_trace_markdown(stage if isinstance(stage, dict) else None, title))
    log = run.get("run_log") or ((run.get("trace") or {}).get("log") if isinstance(run.get("trace"), dict) else None)
    if log:
        lines.extend(
            [
                "##### Kompaktes Laufprotokoll (ohne Promptkörper)",
                "",
                _fence(json.dumps(log, ensure_ascii=False, indent=2)),
                "",
            ]
        )
    return lines


def export_filename(fmt: str, document: dict | None = None) -> str:
    stamp = datetime.now(timezone.utc).strftime("%Y%m%d-%H%M%S")
    suffix = "md" if fmt == "markdown" else "json"
    scope = (document or {}).get("scope") or "all"
    if scope == "conversation":
        return f"kansho-debug-conversation-{stamp}.{suffix}"
    if scope == "journal_generate":
        return f"kansho-debug-journal-{stamp}.{suffix}"
    if scope == "day":
        return f"kansho-debug-day-{stamp}.{suffix}"
    return f"kansho-debug-{stamp}.{suffix}"