/**
 * Workspace autosave trigger.
 *
 *   POST /api/admin/path-b/autosave
 *   Headers: Authorization: Bearer <NEXTAUTH_SECRET>
 *   Body:    { projectId: string, projectSlug: string }
 *
 * Pushes /workspace inside the project's dev container to a
 * `vibn-autosave/main` branch in Gitea. Throttled to once per 5 min
 * per project so we don't hammer Gitea on every chat turn.
 *
 * Two intended callers:
 *   1. Chat post-turn hook (best-effort fire-and-forget).
 *   2. Cron sweep every 5 min as a backstop.
 *
 * The autosave branch is force-pushed; never collides with `main`.
 * Treat this as a recovery point, not history — the user's real
 * commits go through the `ship` tool.
 */

import { NextResponse } from "next/server";
import { autosaveWorkspace } from "@/lib/dev-container";
import { query } from "@/lib/db-postgres";
import { getOrCreateProvisionedWorkspace } from "@/lib/workspaces";
import { timingSafeStringEq } from "@/lib/server/timing-safe";

export async function POST(request: Request) {
  const expected = process.env.NEXTAUTH_SECRET ?? "";
  if (!expected) {
    return NextResponse.json(
      { error: "NEXTAUTH_SECRET not configured" },
      { status: 503 },
    );
  }
  const auth = request.headers.get("authorization") ?? "";
  const bearer = auth.toLowerCase().startsWith("bearer ")
    ? auth.slice(7).trim()
    : "";
  if (!bearer || !timingSafeStringEq(expected, bearer)) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }
  let body: { projectId?: string; projectSlug?: string; sweep?: boolean };
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON body" }, { status: 400 });
  }

  // Single-project mode.
  if (body.projectId) {
    const projectId = String(body.projectId);
    const row = await query<{ slug: string; data: any; workspace: string }>(
      `SELECT slug, data, workspace FROM fs_projects WHERE id = $1 LIMIT 1`,
      [projectId],
    );
    if (row.length === 0) {
      return NextResponse.json({ error: "Project not found" }, { status: 404 });
    }
    const ws = await getOrCreateProvisionedWorkspace({
      userId: row[0].data?.userId ?? "",
      email: row[0].data?.ownerEmail ?? "",
      displayName: row[0].workspace,
    }).catch(() => null);
    if (!ws) {
      return NextResponse.json(
        { error: "Workspace not provisioned" },
        { status: 503 },
      );
    }
    const result = await autosaveWorkspace({
      projectId,
      projectSlug: row[0].slug,
      workspace: ws,
    });
    return NextResponse.json({ result });
  }

  // Sweep mode: autosave every project with a running dev container.
  if (body.sweep) {
    const rows = await query<{ project_id: string; workspace: string }>(
      `SELECT project_id, workspace FROM fs_project_dev_containers WHERE state = 'running'`,
      [],
    );
    const out: Array<{ projectId: string; ran: boolean; reason: string }> = [];
    for (const r of rows) {
      const proj = await query<{ slug: string; data: any }>(
        `SELECT slug, data FROM fs_projects WHERE id = $1 LIMIT 1`,
        [r.project_id],
      );
      if (proj.length === 0) continue;
      const ws = await getOrCreateProvisionedWorkspace({
        userId: proj[0].data?.userId ?? "",
        email: proj[0].data?.ownerEmail ?? "",
        displayName: r.workspace,
      }).catch(() => null);
      if (!ws) continue;
      const res = await autosaveWorkspace({
        projectId: r.project_id,
        projectSlug: proj[0].slug,
        workspace: ws,
      }).catch((err) => ({
        ran: false,
        reason: err instanceof Error ? err.message : String(err),
      }));
      out.push({ projectId: r.project_id, ran: res.ran, reason: res.reason });
    }
    return NextResponse.json({ result: { swept: out.length, out } });
  }

  return NextResponse.json(
    { error: "Provide either { projectId } or { sweep: true }" },
    { status: 400 },
  );
}