import { Client, InMemoryTransport } from "@modelcontextprotocol/client";
import type { CallToolResult } from "@modelcontextprotocol/server";
import { afterEach, describe, expect, it } from "vitest";

import {
  BinarySession,
  type BinaryClient,
} from "../../src/application/BinarySession.js";
import type { HopperToolPort } from "../../src/application/HopperToolPort.js";
import { HopperRemoteError } from "../../src/domain/errors.js";
import { err, ok } from "../../src/domain/result.js";
import { createServer } from "../../src/server/createServer.js";

const resources: Array<{ close(): Promise<void> }> = [];

afterEach(async () => {
  await Promise.all(
    resources.splice(0).map(async (resource) => resource.close()),
  );
});

const connect = async (hopper: HopperToolPort) => {
  const server = createServer(hopper);
  const client = new Client({
    name: "integration-test",
    version: "1.0.0",
  });
  const [clientTransport, serverTransport] =
    InMemoryTransport.createLinkedPair();
  resources.push(client, server);
  await server.connect(serverTransport);
  await client.connect(clientTransport);
  return client;
};

const text = (result: CallToolResult): string => {
  const content = result.content.find((item) => item.type === "text");
  if (content?.type !== "text") throw new Error("missing text result");
  return content.text;
};

describe("full MCP integration with multi-tool sequences", () => {
  it("executes a realistic workflow: list methods, decompile selected, get xrefs", async () => {
    const client = await connect({
      callTool: (name, args) => {
        switch (name) {
          case "list_procedures":
            return Promise.resolve(
              ok({ "0x1000": "main", "0x2000": "helper" }),
            );
          case "procedure_pseudo_code":
            return Promise.resolve(
              ok(`pseudo for ${(args as { procedure: string }).procedure}`),
            );
          case "xrefs":
            return Promise.resolve(ok(["0x1000"]));
          default:
            return Promise.resolve(ok(null));
        }
      },
    });

    const listResult = await client.callTool({
      name: "list_procedures",
      arguments: {},
    });
    expect(listResult.isError).not.toBe(true);
    const procedures = JSON.parse(text(listResult));
    expect(procedures).toEqual({ "0x1000": "main", "0x2000": "helper" });

    const decompileResult = await client.callTool({
      name: "procedure_pseudo_code",
      arguments: { procedure: "0x1000" },
    });
    expect(text(decompileResult)).toBe("pseudo for 0x1000");

    const xrefResult = await client.callTool({
      name: "xrefs",
      arguments: {},
    });
    expect(JSON.parse(text(xrefResult))).toEqual(["0x1000"]);
  });

  it("preserves the complete 42-tool inventory with a session", async () => {
    const session = new BinarySession((_path) => ({
      callTool: () => Promise.resolve(ok(null)),
      close: () => Promise.resolve(),
    } satisfies BinaryClient));
    const server = createServer(
      { callTool: () => Promise.resolve(ok(null)) },
      session,
    );
    const client = new Client({
      name: "integration-test",
      version: "1.0.0",
    });
    const [clientTransport, serverTransport] =
      InMemoryTransport.createLinkedPair();
    resources.push(client, server);
    await server.connect(serverTransport);
    await client.connect(clientTransport);

    const listed = await client.listTools();
    expect(listed.tools).toHaveLength(42);
    const names = listed.tools.map((t) => t.name);
    expect(names).toContain("open_binary");
    expect(names).toContain("close_binary");
    expect(names).toContain("binary_session");
    expect(names).toContain("binary_overview");
    expect(names).toContain("batch_decompile");
  });

  it("preserves the 39-tool inventory without a session", async () => {
    const client = await connect({
      callTool: () => Promise.resolve(ok(null)),
    });
    const listed = await client.listTools();
    expect(listed.tools).toHaveLength(39);
    const names = listed.tools.map((t) => t.name);
    expect(names).toContain("binary_overview");
    expect(names).toContain("batch_decompile");
    expect(names).not.toContain("open_binary");
  });

  it("propagates remote Hopper errors with structured content", async () => {
    const client = await connect({
      callTool: () =>
        Promise.resolve(err(new HopperRemoteError(-32000, "bridge timeout"))),
    });

    const result = await client.callTool({
      name: "list_documents",
      arguments: {},
    });
    expect(result.isError).toBe(true);
    expect(text(result)).toContain("HopperRemoteError");
    expect(text(result)).toContain("bridge timeout");
  });

  it("handles concurrent tool calls without corruption", async () => {
    const invocations: string[] = [];
    const client = await connect({
      callTool: (name) => {
        invocations.push(name);
        return Promise.resolve(ok({ handled: name }));
      },
    });

    const results = await Promise.all([
      client.callTool({ name: "list_procedures", arguments: {} }),
      client.callTool({ name: "list_segments", arguments: {} }),
      client.callTool({ name: "list_strings", arguments: {} }),
    ]);

    expect(results.every((r) => !r.isError)).toBe(true);
    expect(invocations).toHaveLength(3);
    expect(new Set(invocations).size).toBe(3);
  });
});