import { ResourceTemplate, type McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { eq } from "../drizzle.js";
import { db } from "../db.js";
import { views } from "../schema.js";

export function registerViewResource(mcp: McpServer): void {
  mcp.registerResource(
    "view",
    new ResourceTemplate("view://{id}", { list: undefined }),
    {
      description: "View configuration, metadata, and parent object summary.",
      mimeType: "application/json",
    },
    async (uri, variables) => {
      const id = variables.id;
      if (!id) {
        return {
          contents: [
            {
              uri: uri.toString(),
              mimeType: "application/json",
              text: JSON.stringify({ error: "Missing view id" }),
            },
          ],
        };
      }

      const view = await db.query.views.findFirst({
        where: eq(views.id, id),
        with: {
          object: true,
        },
      });

      if (!view) {
        return {
          contents: [
            {
              uri: uri.toString(),
              mimeType: "application/json",
              text: JSON.stringify({ error: "View not found", id }),
            },
          ],
        };
      }

      const parent = view.object;
      const objectSummary =
        parent && !Array.isArray(parent)
          ? {
              id: parent.id,
              title: parent.title,
              type: parent.type,
            }
          : null;

      const payload = {
        view: {
          id: view.id,
          objectId: view.objectId,
          viewType: view.viewType,
          name: view.name,
          config: view.config,
          sortOrder: view.sortOrder,
          createdAt: view.createdAt,
          updatedAt: view.updatedAt,
        },
        object: objectSummary,
      };

      return {
        contents: [
          {
            uri: uri.toString(),
            mimeType: "application/json",
            text: JSON.stringify(payload, null, 2),
          },
        ],
      };
    },
  );
}