from fastapi import APIRouter, Depends, HTTPException, Query
from fastapi.responses import Response
from pydantic import BaseModel, Field
import json

from auth import require_admin_dep
from db import get_db
from debug_store import (
    clear_runs,
    debug_tree,
    delete_run,
    export_document,
    export_filename,
    get_run,
    latest_run,
    list_runs,
    render_markdown,
    set_persist_enabled,
    settings_payload,
)
from dialogue_store import StoreError, get_conversation, inventory, list_conversations, list_derived_for_conversation, list_messages
from identity_store import (
    confirm_identity,
    confirm_review_proposal,
    deactivate_identity,
    delete_identity,
    delete_review_proposal,
    dismiss_review_proposal,
    list_registry,
    list_review_proposals,
    update_identity,
)
from provider_settings import ROLES, SettingsError, public_status, set_role_key, upsert_setting
from version import APP_VERSION, BUILD_DATE, MODULE_VERSIONS

router = APIRouter(prefix="/api/admin", tags=["admin"])


@router.get("/health")
def admin_health(session: dict = Depends(require_admin_dep)):
    with get_db() as conn:
        users = conn.execute("SELECT COUNT(*) AS n FROM profiles").fetchone()["n"]
        prompts = conn.execute("SELECT COUNT(*) AS n FROM ai_prompts").fetchone()["n"]
        features = conn.execute("SELECT COUNT(*) AS n FROM features").fetchone()["n"]
        dialogue = inventory()
    providers = public_status()
    debug = settings_payload(session["profile_id"])
    return {
        "ok": True,
        "service": "kansho",
        "version": APP_VERSION,
        "build_date": BUILD_DATE,
        "modules": MODULE_VERSIONS,
        "inventory": {
            "users": users,
            "prompts": prompts,
            "features": features,
            "dialogue": dialogue,
            "debug_runs": debug["run_count"],
            "debug_persist_enabled": debug["persist_enabled"],
            "providers": {
                role["role"]: {"ready": role["ready"], "key_present": role["key_present"]}
                for role in providers["roles"]
            },
        },
        "session": {
            "profile_id": session["profile_id"],
            "role": session["role"],
        },
    }


@router.get("/dialogue")
def admin_dialogue(session: dict = Depends(require_admin_dep)):
    return {
        "instance": inventory(),
        "own_conversations": list_conversations(session["profile_id"]),
        "note": "Fremde Lived Experience ist kein Alltagspfad. Detailansicht nur für das eigene Profil.",
    }


@router.get("/dialogue/conversations/{conversation_id}")
def admin_conversation(conversation_id: str, session: dict = Depends(require_admin_dep)):
    try:
        conv = get_conversation(session["profile_id"], conversation_id)
        return {
            "conversation": conv,
            "original_messages": list_messages(session["profile_id"], conversation_id),
            "derived_records": list_derived_for_conversation(session["profile_id"], conversation_id),
        }
    except StoreError as exc:
        raise HTTPException(status_code=exc.status_code, detail={"code": exc.code, "message": exc.message}) from exc


class DebugToggle(BaseModel):
    persist_enabled: bool


@router.get("/debug")
def admin_debug(session: dict = Depends(require_admin_dep)):
    return settings_payload(session["profile_id"])


@router.put("/debug")
def admin_update_debug(body: DebugToggle, session: dict = Depends(require_admin_dep)):
    payload = set_persist_enabled(body.persist_enabled)
    payload["run_count"] = settings_payload(session["profile_id"])["run_count"]
    return payload


@router.get("/debug/tree")
def admin_debug_tree(session: dict = Depends(require_admin_dep)):
    return debug_tree(session["profile_id"])


@router.get("/debug/runs")
def admin_debug_runs(limit: int = Query(default=200, ge=1, le=500), session: dict = Depends(require_admin_dep)):
    return {"runs": list_runs(session["profile_id"], limit=limit)}


@router.get("/debug/latest")
def admin_debug_latest(
    journal_day_id: str | None = None,
    purpose: str | None = None,
    session: dict = Depends(require_admin_dep),
):
    return {
        "run": latest_run(
            session["profile_id"],
            journal_day_id=journal_day_id,
            purpose=purpose,
        )
    }


@router.get("/debug/export")
def admin_debug_export(
    format: str = Query(default="json"),
    conversation_id: str | None = None,
    journal_day_id: str | None = None,
    purpose: str | None = None,
    session: dict = Depends(require_admin_dep),
):
    fmt = (format or "json").strip().lower()
    if fmt not in {"json", "markdown"}:
        raise HTTPException(
            status_code=400,
            detail={"code": "invalid_debug_export_format", "message": "Format ist json oder markdown."},
        )
    document = export_document(
        session["profile_id"],
        conversation_id=conversation_id,
        journal_day_id=journal_day_id,
        purpose=purpose,
    )
    filename = export_filename(fmt, document)
    if fmt == "markdown":
        body = render_markdown(document)
        return Response(
            content=body.encode("utf-8"),
            media_type="text/markdown; charset=utf-8",
            headers={"Content-Disposition": f'attachment; filename="{filename}"'},
        )
    body = json.dumps(document, ensure_ascii=False, indent=2)
    return Response(
        content=body.encode("utf-8"),
        media_type="application/json; charset=utf-8",
        headers={"Content-Disposition": f'attachment; filename="{filename}"'},
    )


@router.post("/debug/runs/clear")
def admin_clear_debug_runs(session: dict = Depends(require_admin_dep)):
    deleted = clear_runs(session["profile_id"])
    return {"ok": True, "deleted": deleted}


@router.get("/debug/runs/{run_id}")
def admin_debug_run(run_id: str, session: dict = Depends(require_admin_dep)):
    item = get_run(session["profile_id"], run_id)
    if not item:
        raise HTTPException(status_code=404, detail={"code": "debug_run_missing", "message": "Debug-Lauf fehlt."})
    return item


@router.delete("/debug/runs/{run_id}")
def admin_delete_debug_run(run_id: str, session: dict = Depends(require_admin_dep)):
    if not delete_run(session["profile_id"], run_id):
        raise HTTPException(status_code=404, detail={"code": "debug_run_missing", "message": "Debug-Lauf fehlt."})
    return {"ok": True}


class ProviderUpdate(BaseModel):
    name: str = ""
    url: str = ""
    model: str = ""
    zdr: bool = True
    no_train: bool = True
    key: str | None = Field(default=None, description="Write-only. Never returned.")


@router.get("/providers")
def admin_providers(session: dict = Depends(require_admin_dep)):
    return public_status()


@router.put("/providers/{role}")
def admin_update_provider(role: str, body: ProviderUpdate, session: dict = Depends(require_admin_dep)):
    if role not in ROLES:
        raise HTTPException(status_code=404, detail={"code": "unknown_provider_role", "message": "Unbekannte Provider-Rolle."})
    try:
        upsert_setting(
            role,
            name=body.name,
            url=body.url,
            model=body.model,
            zdr=body.zdr,
            no_train=body.no_train,
        )
        if body.key is not None and body.key.strip():
            set_role_key(role, body.key)
    except SettingsError as exc:
        raise HTTPException(status_code=exc.status_code, detail={"code": exc.code, "message": exc.message}) from exc
    return public_status()


class IdentityWrite(BaseModel):
    canonical_label: str = ""
    entity_type: str = "PERSON"
    aliases: list[str] = Field(default_factory=list)
    token: str | None = None
    status: str | None = None


class IdentityPatch(BaseModel):
    canonical_label: str | None = None
    entity_type: str | None = None
    aliases: list[str] | None = None
    status: str | None = None


def _identity_error(exc: ValueError) -> HTTPException:
    code = str(exc)
    messages = {
        "empty_label": "Bezeichnung ist leer oder nicht maskierbar.",
        "invalid_entity_type": "Unzulässiger Entitätstyp.",
        "invalid_status": "Unzulässiger Status.",
        "identity_missing": "Registry-Eintrag fehlt.",
        "proposal_missing": "Vorschlag fehlt.",
    }
    return HTTPException(status_code=400, detail={"code": code, "message": messages.get(code, "Ungültige Identitätsangabe.")})


@router.get("/identities")
def admin_identities(session: dict = Depends(require_admin_dep)):
    profile_id = session["profile_id"]
    return {
        "registry": list_registry(profile_id),
        "proposals": list_review_proposals(profile_id, include_dismissed=True),
        "note": "Nur lokale bestätigte Registry und unbestätigte Vorschläge. Kein externer Egress.",
        "backup": (
            "Vor einer Bereinigung die lokale Datei backend/data/kansho.sqlite kopieren. "
            "Wiederherstellung: Anwendung beenden und die Kopie zurücklegen."
        ),
    }


@router.post("/identities")
def admin_create_identity(body: IdentityWrite, session: dict = Depends(require_admin_dep)):
    try:
        return confirm_identity(
            session["profile_id"],
            body.canonical_label,
            entity_type=body.entity_type,
            token=body.token,
            aliases=body.aliases,
        )
    except ValueError as exc:
        raise _identity_error(exc) from exc


@router.patch("/identities/{identity_id}")
def admin_update_identity(identity_id: str, body: IdentityPatch, session: dict = Depends(require_admin_dep)):
    try:
        return update_identity(
            session["profile_id"],
            identity_id,
            canonical_label=body.canonical_label,
            entity_type=body.entity_type,
            aliases=body.aliases,
            status=body.status,
        )
    except ValueError as exc:
        raise _identity_error(exc) from exc


@router.post("/identities/{identity_id}/deactivate")
def admin_deactivate_identity(identity_id: str, session: dict = Depends(require_admin_dep)):
    try:
        return deactivate_identity(session["profile_id"], identity_id)
    except ValueError as exc:
        raise _identity_error(exc) from exc


@router.delete("/identities/{identity_id}")
def admin_delete_identity(identity_id: str, session: dict = Depends(require_admin_dep)):
    delete_identity(session["profile_id"], identity_id)
    return {"ok": True}


@router.post("/identities/proposals/{proposal_id}/confirm")
def admin_confirm_proposal(proposal_id: str, body: IdentityPatch | None = None, session: dict = Depends(require_admin_dep)):
    payload = body or IdentityPatch()
    try:
        return confirm_review_proposal(
            session["profile_id"],
            proposal_id,
            canonical_label=payload.canonical_label,
            entity_type=payload.entity_type,
            aliases=payload.aliases,
        )
    except ValueError as exc:
        raise _identity_error(exc) from exc


@router.post("/identities/proposals/{proposal_id}/dismiss")
def admin_dismiss_proposal(proposal_id: str, session: dict = Depends(require_admin_dep)):
    dismiss_review_proposal(session["profile_id"], proposal_id)
    return {"ok": True}


@router.delete("/identities/proposals/{proposal_id}")
def admin_delete_proposal(proposal_id: str, session: dict = Depends(require_admin_dep)):
    delete_review_proposal(session["profile_id"], proposal_id)
    return {"ok": True}