import fs from "node:fs/promises";
import { createRequire } from "node:module";
import path from "node:path";
import "./test-helpers/fast-coding-tools.js";
import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
import {
  cleanupEmbeddedPiRunnerTestWorkspace,
  createEmbeddedPiRunnerOpenAiConfig,
  createEmbeddedPiRunnerTestWorkspace,
  type EmbeddedPiRunnerTestWorkspace,
  immediateEnqueue,
} from "./test-helpers/pi-embedded-runner-e2e-fixtures.js";

const E2E_TIMEOUT_MS = 20_000;
const require = createRequire(import.meta.url);
const SDK_SERVER_MCP_PATH = require.resolve("@modelcontextprotocol/sdk/server/mcp.js");
const SDK_SERVER_STDIO_PATH = require.resolve("@modelcontextprotocol/sdk/server/stdio.js");

function createMockUsage(input: number, output: number) {
  return {
    input,
    output,
    cacheRead: 0,
    cacheWrite: 0,
    totalTokens: input + output,
    cost: {
      input: 0,
      output: 0,
      cacheRead: 0,
      cacheWrite: 0,
      total: 0,
    },
  };
}

let streamCallCount = 0;
let observedContexts: Array<Array<{ role?: string; content?: unknown }>> = [];

async function writeExecutable(filePath: string, content: string): Promise<void> {
  await fs.mkdir(path.dirname(filePath), { recursive: true });
  await fs.writeFile(filePath, content, { encoding: "utf-8", mode: 0o755 });
}

async function writeBundleProbeMcpServer(filePath: string): Promise<void> {
  await writeExecutable(
    filePath,
    `#!/usr/bin/env node
import { McpServer } from ${JSON.stringify(SDK_SERVER_MCP_PATH)};
import { StdioServerTransport } from ${JSON.stringify(SDK_SERVER_STDIO_PATH)};

const server = new McpServer({ name: "bundle-probe", version: "1.0.0" });
server.tool("bundle_probe", "Bundle MCP probe", async () => {
  return {
    content: [{ type: "text", text: process.env.BUNDLE_PROBE_TEXT ?? "missing-probe-text" }],
  };
});

await server.connect(new StdioServerTransport());
`,
  );
}

async function writeClaudeBundle(params: {
  pluginRoot: string;
  serverScriptPath: string;
}): Promise<void> {
  await fs.mkdir(path.join(params.pluginRoot, ".claude-plugin"), { recursive: true });
  await fs.writeFile(
    path.join(params.pluginRoot, ".claude-plugin", "plugin.json"),
    `${JSON.stringify({ name: "bundle-probe" }, null, 2)}\n`,
    "utf-8",
  );
  await fs.writeFile(
    path.join(params.pluginRoot, ".mcp.json"),
    `${JSON.stringify(
      {
        mcpServers: {
          bundleProbe: {
            command: "node",
            args: [path.relative(params.pluginRoot, params.serverScriptPath)],
            env: {
              BUNDLE_PROBE_TEXT: "FROM-BUNDLE",
            },
          },
        },
      },
      null,
      2,
    )}\n`,
    "utf-8",
  );
}

vi.mock("@mariozechner/pi-coding-agent", async () => {
  return await vi.importActual<typeof import("@mariozechner/pi-coding-agent")>(
    "@mariozechner/pi-coding-agent",
  );
});

vi.mock("@mariozechner/pi-ai", async () => {
  const actual = await vi.importActual<typeof import("@mariozechner/pi-ai")>("@mariozechner/pi-ai");

  const buildToolUseMessage = (model: { api: string; provider: string; id: string }) => ({
    role: "assistant" as const,
    content: [
      {
        type: "toolCall" as const,
        id: "tc-bundle-mcp-1",
        name: "bundle_probe",
        arguments: {},
      },
    ],
    stopReason: "toolUse" as const,
    api: model.api,
    provider: model.provider,
    model: model.id,
    usage: createMockUsage(1, 1),
    timestamp: Date.now(),
  });

  const buildStopMessage = (
    model: { api: string; provider: string; id: string },
    text: string,
  ) => ({
    role: "assistant" as const,
    content: [{ type: "text" as const, text }],
    stopReason: "stop" as const,
    api: model.api,
    provider: model.provider,
    model: model.id,
    usage: createMockUsage(1, 1),
    timestamp: Date.now(),
  });

  return {
    ...actual,
    complete: async (model: { api: string; provider: string; id: string }) => {
      streamCallCount += 1;
      return streamCallCount === 1
        ? buildToolUseMessage(model)
        : buildStopMessage(model, "BUNDLE MCP OK FROM-BUNDLE");
    },
    completeSimple: async (model: { api: string; provider: string; id: string }) => {
      streamCallCount += 1;
      return streamCallCount === 1
        ? buildToolUseMessage(model)
        : buildStopMessage(model, "BUNDLE MCP OK FROM-BUNDLE");
    },
    streamSimple: (
      model: { api: string; provider: string; id: string },
      context: { messages?: Array<{ role?: string; content?: unknown }> },
    ) => {
      streamCallCount += 1;
      const messages = (context.messages ?? []).map((message) => ({ ...message }));
      observedContexts.push(messages);
      const stream = actual.createAssistantMessageEventStream();
      queueMicrotask(() => {
        if (streamCallCount === 1) {
          stream.push({
            type: "done",
            reason: "toolUse",
            message: buildToolUseMessage(model),
          });
          stream.end();
          return;
        }

        const toolResultText = messages.flatMap((message) =>
          Array.isArray(message.content)
            ? (message.content as Array<{ type?: string; text?: string }>)
                .filter((entry) => entry.type === "text" && typeof entry.text === "string")
                .map((entry) => entry.text ?? "")
            : [],
        );
        const sawBundleResult = toolResultText.some((text) => text.includes("FROM-BUNDLE"));
        if (!sawBundleResult) {
          stream.push({
            type: "error",
            reason: "error",
            error: {
              role: "assistant" as const,
              content: [],
              stopReason: "error" as const,
              errorMessage: "bundle MCP tool result missing from context",
              api: model.api,
              provider: model.provider,
              model: model.id,
              usage: createMockUsage(1, 0),
              timestamp: Date.now(),
            },
          });
          stream.end();
          return;
        }

        stream.push({
          type: "done",
          reason: "stop",
          message: buildStopMessage(model, "BUNDLE MCP OK FROM-BUNDLE"),
        });
        stream.end();
      });
      return stream;
    },
  };
});

let runEmbeddedPiAgent: typeof import("./pi-embedded-runner/run.js").runEmbeddedPiAgent;
let e2eWorkspace: EmbeddedPiRunnerTestWorkspace | undefined;
let agentDir: string;
let workspaceDir: string;

beforeAll(async () => {
  vi.useRealTimers();
  ({ runEmbeddedPiAgent } = await import("./pi-embedded-runner/run.js"));
  e2eWorkspace = await createEmbeddedPiRunnerTestWorkspace("openclaw-bundle-mcp-pi-");
  ({ agentDir, workspaceDir } = e2eWorkspace);
}, 180_000);

afterAll(async () => {
  await cleanupEmbeddedPiRunnerTestWorkspace(e2eWorkspace);
  e2eWorkspace = undefined;
});

const readSessionMessages = async (sessionFile: string) => {
  const raw = await fs.readFile(sessionFile, "utf-8");
  return raw
    .split(/\r?\n/)
    .filter(Boolean)
    .map(
      (line) =>
        JSON.parse(line) as { type?: string; message?: { role?: string; content?: unknown } },
    )
    .filter((entry) => entry.type === "message")
    .map((entry) => entry.message) as Array<{ role?: string; content?: unknown }>;
};

describe("runEmbeddedPiAgent bundle MCP e2e", () => {
  it(
    "loads bundle MCP into Pi, executes the MCP tool, and includes the result in the follow-up turn",
    { timeout: E2E_TIMEOUT_MS },
    async () => {
      streamCallCount = 0;
      observedContexts = [];

      const sessionFile = path.join(workspaceDir, "session-bundle-mcp-e2e.jsonl");
      const pluginRoot = path.join(workspaceDir, ".openclaw", "extensions", "bundle-probe");
      const serverScriptPath = path.join(pluginRoot, "servers", "bundle-probe.mjs");
      await writeBundleProbeMcpServer(serverScriptPath);
      await writeClaudeBundle({ pluginRoot, serverScriptPath });

      const cfg = {
        ...createEmbeddedPiRunnerOpenAiConfig(["mock-bundle-mcp"]),
        plugins: {
          entries: {
            "bundle-probe": { enabled: true },
          },
        },
      };

      const result = await runEmbeddedPiAgent({
        sessionId: "bundle-mcp-e2e",
        sessionKey: "agent:test:bundle-mcp-e2e",
        sessionFile,
        workspaceDir,
        config: cfg,
        prompt: "Use the bundle MCP tool and report its result.",
        provider: "openai",
        model: "mock-bundle-mcp",
        timeoutMs: 10_000,
        agentDir,
        runId: "run-bundle-mcp-e2e",
        enqueue: immediateEnqueue,
      });

      expect(result.meta.stopReason).toBe("stop");
      expect(result.payloads?.[0]?.text).toContain("BUNDLE MCP OK FROM-BUNDLE");
      expect(streamCallCount).toBe(2);

      const followUpContext = observedContexts[1] ?? [];
      const followUpTexts = followUpContext.flatMap((message) =>
        Array.isArray(message.content)
          ? (message.content as Array<{ type?: string; text?: string }>)
              .filter((entry) => entry.type === "text" && typeof entry.text === "string")
              .map((entry) => entry.text ?? "")
          : [],
      );
      expect(followUpTexts.some((text) => text.includes("FROM-BUNDLE"))).toBe(true);

      const messages = await readSessionMessages(sessionFile);
      const toolResults = messages.filter((message) => message?.role === "toolResult");
      const toolResultText = toolResults.flatMap((message) =>
        Array.isArray(message.content)
          ? (message.content as Array<{ type?: string; text?: string }>)
              .filter((entry) => entry.type === "text" && typeof entry.text === "string")
              .map((entry) => entry.text ?? "")
          : [],
      );
      expect(toolResultText.some((text) => text.includes("FROM-BUNDLE"))).toBe(true);
    },
  );
});