import {
  analyseScenario,
  PROMPT_VERSIONS,
  DEFAULT_PROMPT_VERSION,
} from "@/lib/analysis";
import { withAuthenticatedApi } from "@/lib/supabase/api-auth.js";

async function post(request) {
  try {
    const body = await request.json();

    if (!body.scenario || typeof body.scenario !== "string") {
      return Response.json(
        { error: "Request must include a 'scenario' string field" },
        { status: 400 },
      );
    }

    // Optional prompt version override
    let promptVersion = DEFAULT_PROMPT_VERSION;
    if (body.promptVersion && PROMPT_VERSIONS.includes(body.promptVersion)) {
      promptVersion = body.promptVersion;
    }

    const result = await analyseScenario(body.scenario, { promptVersion });

    if (!result.success) {
      return Response.json(
        { error: "Reasoning request could not be completed." },
        { status: Number(result.statusCode) || 500 },
      );
    }

    return Response.json({
      inputClassification: result.inputClassification,
      reconstruction: result.reconstruction,
      evidence: result.evidence,
      nextQuestion: result.nextQuestion,
      modelName: result.modelName,
      responseDurationMs: result.responseDurationMs,
      validationStatus: result.validationStatus,
      promptVersion: result.promptVersion,
    });
  } catch (e) {
    if (e.code === "PROVIDER_UNAVAILABLE") {
      return Response.json(
        { error: "Reasoning service is temporarily unavailable." },
        { status: 503 },
      );
    }

    const validationFailed = e?.validationFailed || e?.code === "VALIDATION_FAILED";
    if (validationFailed) {
      return Response.json(
        { success: false, error: "Reasoning request could not be completed." },
        { status: Number(e.statusCode) || 500 },
      );
    }

    const statusCode = Number(e.statusCode) || 500;
    return Response.json(
      { error: "Reasoning request could not be completed." },
      { status: statusCode },
    );
  }
}

export const POST = withAuthenticatedApi(post);