// POST /api/seed/finalize
//
// Pivot flow: turn the SeedDraft into structured prose, persist it as the
// NarrativeDocument, create an empty model snapshot, and return the new
// project id so the client can navigate to /editor/[id]. The analyze
// pipeline runs on first paint of the editor (or via Analyze All).

import { NextResponse } from "next/server";
import { createProjectFromSeed, saveDocument } from "../../../../lib/db/repo";
import { seedToProseDoc } from "../../../../lib/llm/seedToProse";
import { runAnalyze } from "../../../../lib/llm/analyze/runAll";
import type { SeedDraft } from "../../../../lib/llm/seedInterview";
import type { SysMLModel } from "../../../../lib/sysml/model";

export async function POST(req: Request) {
  let body: { draft?: SeedDraft };
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "invalid json body" }, { status: 400 });
  }
  const draft = body.draft;
  if (!draft || !draft.problem || !draft.targetUser || !draft.desiredOutcome) {
    return NextResponse.json(
      { error: "draft must include problem, targetUser, desiredOutcome" },
      { status: 400 }
    );
  }

  try {
    const emptyModel: SysMLModel = { blocks: [], associations: [], constraints: [], requirements: [] };
    const created = await createProjectFromSeed({
      name: draft.title?.trim() || "Untitled idea",
      scope: "Untitled scope",
      tagline: draft.problem.slice(0, 80),
      model: emptyModel,
    });
    await saveDocument(created.projectId, seedToProseDoc(draft));

    // Kick off the full Analyze pipeline in the background so the editor lands
    // populated. Errors are logged but do not block the redirect — the user
    // can hit Analyze All again from the TopBar if anything goes sideways.
    void runAnalyze(created.projectId, "all").catch(err =>
      console.error(`[seed/finalize] background analyze failed for ${created.projectId}:`, err)
    );

    return NextResponse.json({ projectId: created.projectId, version: created.version });
  } catch (err) {
    return NextResponse.json({ error: (err as Error).message }, { status: 500 });
  }
}