import { readJson } from "@/server/http/readJson";
import {
  createSnippet,
  deleteSnippet,
  getSnippetById,
  listSnippets,
  normalizeDeadlineAtInput,
  updateSnippet,
} from "@/server/snippets";

export const snippetRoutes = {
  "/api/snippets": {
    async GET(req: Request) {
      const url = new URL(req.url);
      const q = url.searchParams.get("q");
      const sort = url.searchParams.get("sort");
      return Response.json(listSnippets(q, sort));
    },
    async POST(req: Request) {
      const body = await readJson(req);
      if (!body || typeof body !== "object") {
        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
      }
      const o = body as Record<string, unknown>;
      const tags = Array.isArray(o.tags) ? o.tags.filter((t): t is string => typeof t === "string") : [];
      let deadline_at: string | null | undefined;
      if ("deadline_at" in o) {
        try {
          deadline_at = normalizeDeadlineAtInput(o.deadline_at);
        } catch (e) {
          const msg = e instanceof Error ? e.message : "deadline_at ungültig";
          return Response.json({ error: msg }, { status: 400 });
        }
      }
      const snippet = createSnippet({
        title:
          o.title === null ? null : typeof o.title === "string" ? o.title : undefined,
        body: typeof o.body === "string" ? o.body : "",
        tags,
        deadline_at,
      });
      return Response.json(snippet, { status: 201 });
    },
  },

  "/api/snippets/:id": {
    async GET(req: Request) {
      const id = Number((req as Request & { params: { id: string } }).params.id);
      if (!Number.isFinite(id)) {
        return Response.json({ error: "Invalid id" }, { status: 400 });
      }
      const snippet = getSnippetById(id);
      if (!snippet) {
        return Response.json({ error: "Not found" }, { status: 404 });
      }
      return Response.json(snippet);
    },
    async PATCH(req: Request) {
      const id = Number((req as Request & { params: { id: string } }).params.id);
      if (!Number.isFinite(id)) {
        return Response.json({ error: "Invalid id" }, { status: 400 });
      }
      const body = await readJson(req);
      if (!body || typeof body !== "object") {
        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
      }
      const o = body as Record<string, unknown>;
      const patch: {
        title?: string | null;
        body?: string;
        tags?: string[];
        sort_order?: number;
        deadline_at?: string | null;
      } = {};
      if ("title" in o) {
        patch.title = o.title === null ? null : String(o.title);
      }
      if ("body" in o && typeof o.body === "string") {
        patch.body = o.body;
      }
      if ("tags" in o && Array.isArray(o.tags)) {
        patch.tags = o.tags.filter((t): t is string => typeof t === "string");
      }
      if ("sort_order" in o && typeof o.sort_order === "number" && Number.isFinite(o.sort_order)) {
        patch.sort_order = o.sort_order;
      }
      if ("deadline_at" in o) {
        try {
          patch.deadline_at = normalizeDeadlineAtInput(o.deadline_at);
        } catch (e) {
          const msg = e instanceof Error ? e.message : "deadline_at ungültig";
          return Response.json({ error: msg }, { status: 400 });
        }
      }
      const snippet = updateSnippet(id, patch);
      if (!snippet) {
        return Response.json({ error: "Not found" }, { status: 404 });
      }
      return Response.json(snippet);
    },
    async DELETE(req: Request) {
      const id = Number((req as Request & { params: { id: string } }).params.id);
      if (!Number.isFinite(id)) {
        return Response.json({ error: "Invalid id" }, { status: 400 });
      }
      const ok = deleteSnippet(id);
      if (!ok) {
        return Response.json({ error: "Not found" }, { status: 404 });
      }
      return new Response(null, { status: 204 });
    },
  },
};