"""Authenticated debug routes for coach traces and prompt previews.

Paste bundles are self-contained for an external AI with no user history.
"""

from fastapi import APIRouter, Depends, Query, Request, status
from fastapi.responses import PlainTextResponse

from app.deps import require_login
from app.models import ApiEnvelope, CoachRequest, err, ok
from app.paste_bundle import render_paste_bundle

router = APIRouter(
    prefix="/api/debug",
    tags=["debug"],
    dependencies=[Depends(require_login)],
)


def _settings(request: Request):
    return request.app.state.settings


def _paste(request: Request, trace: dict) -> PlainTextResponse:
    settings = _settings(request)
    body = render_paste_bundle(
        trace,
        app_name=settings.app_name,
        shrink_k=settings.stats_shrink_k,
        match_alpha=settings.match_alpha,
        min_n=settings.min_stats_n,
    )
    return PlainTextResponse(content=body, media_type="text/markdown")


@router.get("/traces", response_model=ApiEnvelope)
def list_traces(
    request: Request,
    limit: int = Query(default=20, ge=1, le=200),
) -> dict[str, object]:
    """Return newest-first trace summaries."""

    records = request.app.state.trace_store.list_traces(limit=limit)
    summaries = [
        {
            "trace_id": r.get("trace_id"),
            "ts": r.get("ts"),
            "source": r.get("source"),
            "flags": r.get("flags"),
            "model": r.get("model_id"),
        }
        for r in records
    ]
    return ok({"items": summaries})


@router.get("/traces/{trace_id}", response_model=ApiEnvelope)
def get_trace(request: Request, trace_id: str) -> object:
    """Return one full JSON trace."""

    trace = request.app.state.trace_store.get_trace(trace_id)
    if trace is None:
        return err("not_found", "Trace not found", status.HTTP_404_NOT_FOUND)
    return ok(trace)


@router.get("/traces/{trace_id}/paste")
def paste_trace(request: Request, trace_id: str) -> object:
    """Return the context-free markdown paste bundle for one trace."""

    trace = request.app.state.trace_store.get_trace(trace_id)
    if trace is None:
        return err("not_found", "Trace not found", status.HTTP_404_NOT_FOUND)
    return _paste(request, trace)


@router.get("/last/paste")
def paste_last(request: Request) -> object:
    """Return the newest trace paste bundle."""

    trace = request.app.state.trace_store.latest_trace()
    if trace is None:
        return err("not_found", "No traces yet", status.HTTP_404_NOT_FOUND)
    return _paste(request, trace)


@router.post("/prompt-preview", response_model=ApiEnvelope)
def prompt_preview(request: Request, body: CoachRequest) -> object:
    """Build evidence and messages without calling the model."""

    if not body.text and not body.entry_id:
        return err(
            "validation_error",
            "Provide text or entry_id",
            status.HTTP_422_UNPROCESSABLE_ENTITY,
        )
    try:
        preview = request.app.state.coach_service.prompt_preview(
            text=body.text,
            entry_id=body.entry_id,
            include_history=body.include_history,
        )
    except KeyError:
        return err("not_found", "Entry not found", status.HTTP_404_NOT_FOUND)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)
    return ok(preview)


@router.post("/coach-test", response_model=ApiEnvelope)
def coach_test(request: Request, body: CoachRequest) -> object:
    """Run coach and force a trace; optional force_backup."""

    if not body.text and not body.entry_id:
        return err(
            "validation_error",
            "Provide text or entry_id",
            status.HTTP_422_UNPROCESSABLE_ENTITY,
        )
    try:
        result = request.app.state.coach_service.coach(
            text=body.text,
            entry_id=body.entry_id,
            include_history=body.include_history,
            persist=body.persist,
            force_backup=body.force_backup,
        )
    except KeyError:
        return err("not_found", "Entry not found", status.HTTP_404_NOT_FOUND)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)
    return ok(result)