import { Plugin, Rpc } from "../../.opencode/node_modules/@opencode/plugin/dist/promise/index.js";
import { z } from "../../.opencode/node_modules/zod/index.js";

// Loaded only by the opt-in isolated smoke script, never by the Agent service.
export default Plugin.define({
  id: "tjwater.mcp-fixture",
  async setup(ctx) {
    // Materialize the native session toolbox, then stop before any model call.
    await ctx.session.hook("context", () => { throw new Error("MCP fixture stops before model request"); });
    const evaluated: string[] = [];
    await ctx.permission.hook("evaluate", (event) => { evaluated.push(event.action); });
    await ctx.rpc.register(Rpc.define({
      id: "tjwater.mcp-fixture", events: {}, methods: {
        call: { input: z.object({ session_id: z.string(), tool: z.enum(["mcp_stdio_echo", "mcp_http_write"]), value: z.string() }), output: z.object({ content: z.unknown(), evaluated: z.array(z.string()), error: z.string().optional() }) },
      },
    }), {
      call: async (input, context) => {
        const tool = (await ctx.tool.list()).find((tool) => tool.id === input.tool);
        if (!tool) throw new Error("fixture tool missing");
        try {
          const result = await tool.execute({ value: input.value }, { sessionID: input.session_id as never, id: "call-mcp-fixture" as never, messageID: "msg-mcp-fixture" as never, agent: "instruction" as never, signal: context.signal, progress: async () => {} });
          return { content: result.content ?? [], evaluated };
        } catch (error) { return { content: [], evaluated, error: String(error) }; }
      },
    });
  },
});