import fs from "node:fs";
import os from "node:os";
import path from "node:path";

import {
  beforeEach,
  describe,
  expect,
  it,
  type MockInstance,
  vi,
} from "vitest";

vi.mock("../agents/pi-embedded.js", () => ({
  abortEmbeddedPiRun: vi.fn().mockReturnValue(false),
  runEmbeddedPiAgent: vi.fn(),
  resolveEmbeddedSessionLane: (key: string) =>
    `session:${key.trim() || "main"}`,
}));
vi.mock("../agents/model-catalog.js", () => ({
  loadModelCatalog: vi.fn(),
}));

import { loadModelCatalog } from "../agents/model-catalog.js";
import { runEmbeddedPiAgent } from "../agents/pi-embedded.js";
import type { ClawdbotConfig } from "../config/config.js";
import * as configModule from "../config/config.js";
import type { RuntimeEnv } from "../runtime.js";
import { agentCommand } from "./agent.js";

const runtime: RuntimeEnv = {
  log: vi.fn(),
  error: vi.fn(),
  exit: vi.fn(() => {
    throw new Error("exit");
  }),
};

const configSpy = vi.spyOn(configModule, "loadConfig");

async function withTempHome<T>(fn: (home: string) => Promise<T>): Promise<T> {
  const base = fs.mkdtempSync(path.join(os.tmpdir(), "clawdbot-agent-"));
  const previousHome = process.env.HOME;
  process.env.HOME = base;
  try {
    return await fn(base);
  } finally {
    process.env.HOME = previousHome;
    fs.rmSync(base, { recursive: true, force: true });
  }
}

function mockConfig(
  home: string,
  storePath: string,
  routingOverrides?: Partial<NonNullable<ClawdbotConfig["routing"]>>,
  agentOverrides?: Partial<NonNullable<ClawdbotConfig["agent"]>>,
  telegramOverrides?: Partial<NonNullable<ClawdbotConfig["telegram"]>>,
) {
  configSpy.mockReturnValue({
    agent: {
      model: { primary: "anthropic/claude-opus-4-5" },
      models: { "anthropic/claude-opus-4-5": {} },
      workspace: path.join(home, "clawd"),
      ...agentOverrides,
    },
    session: { store: storePath, mainKey: "main" },
    routing: routingOverrides ? { ...routingOverrides } : undefined,
    telegram: telegramOverrides ? { ...telegramOverrides } : undefined,
  });
}

beforeEach(() => {
  vi.clearAllMocks();
  vi.mocked(runEmbeddedPiAgent).mockResolvedValue({
    payloads: [{ text: "ok" }],
    meta: {
      durationMs: 5,
      agentMeta: { sessionId: "s", provider: "p", model: "m" },
    },
  });
  vi.mocked(loadModelCatalog).mockResolvedValue([]);
});

describe("agentCommand", () => {
  it("creates a session entry when deriving from --to", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store);

      await agentCommand({ message: "hello", to: "+1555" }, runtime);

      const saved = JSON.parse(fs.readFileSync(store, "utf-8")) as Record<
        string,
        { sessionId: string }
      >;
      const entry = Object.values(saved)[0];
      expect(entry.sessionId).toBeTruthy();
    });
  });

  it("persists thinking and verbose overrides", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store);

      await agentCommand(
        { message: "hi", to: "+1222", thinking: "high", verbose: "on" },
        runtime,
      );

      const saved = JSON.parse(fs.readFileSync(store, "utf-8")) as Record<
        string,
        { thinkingLevel?: string; verboseLevel?: string }
      >;
      const entry = Object.values(saved)[0];
      expect(entry.thinkingLevel).toBe("high");
      expect(entry.verboseLevel).toBe("on");

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.thinkLevel).toBe("high");
      expect(callArgs?.verboseLevel).toBe("on");
    });
  });

  it("resumes when session-id is provided", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      fs.mkdirSync(path.dirname(store), { recursive: true });
      fs.writeFileSync(
        store,
        JSON.stringify(
          {
            foo: {
              sessionId: "session-123",
              updatedAt: Date.now(),
              systemSent: true,
            },
          },
          null,
          2,
        ),
      );
      mockConfig(home, store);

      await agentCommand(
        { message: "resume me", sessionId: "session-123" },
        runtime,
      );

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.sessionId).toBe("session-123");
    });
  });

  it("uses provider/model from agent.model", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store, undefined, {
        model: "openai/gpt-4.1-mini",
      });

      await agentCommand({ message: "hi", to: "+1555" }, runtime);

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.provider).toBe("openai");
      expect(callArgs?.model).toBe("gpt-4.1-mini");
    });
  });

  it("keeps explicit sessionKey even when sessionId exists elsewhere", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      fs.mkdirSync(path.dirname(store), { recursive: true });
      fs.writeFileSync(
        store,
        JSON.stringify(
          {
            "agent:main:main": {
              sessionId: "sess-main",
              updatedAt: Date.now(),
            },
          },
          null,
          2,
        ),
      );
      mockConfig(home, store);

      await agentCommand(
        {
          message: "hi",
          sessionId: "sess-main",
          sessionKey: "agent:main:subagent:abc",
        },
        runtime,
      );

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.sessionKey).toBe("agent:main:subagent:abc");

      const saved = JSON.parse(fs.readFileSync(store, "utf-8")) as Record<
        string,
        { sessionId?: string }
      >;
      expect(saved["agent:main:subagent:abc"]?.sessionId).toBe("sess-main");
    });
  });

  it("defaults thinking to low for reasoning-capable models", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store);
      vi.mocked(loadModelCatalog).mockResolvedValueOnce([
        {
          id: "claude-opus-4-5",
          name: "Opus 4.5",
          provider: "anthropic",
          reasoning: true,
        },
      ]);

      await agentCommand({ message: "hi", to: "+1555" }, runtime);

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.thinkLevel).toBe("low");
    });
  });

  it("prints JSON payload when requested", async () => {
    await withTempHome(async (home) => {
      vi.mocked(runEmbeddedPiAgent).mockResolvedValue({
        payloads: [{ text: "json-reply", mediaUrl: "http://x.test/a.jpg" }],
        meta: {
          durationMs: 42,
          agentMeta: { sessionId: "s", provider: "p", model: "m" },
        },
      });
      const store = path.join(home, "sessions.json");
      mockConfig(home, store);

      await agentCommand({ message: "hi", to: "+1999", json: true }, runtime);

      const logged = (runtime.log as MockInstance).mock.calls.at(
        -1,
      )?.[0] as string;
      const parsed = JSON.parse(logged) as {
        payloads: Array<{ text: string; mediaUrl?: string | null }>;
        meta: { durationMs: number };
      };
      expect(parsed.payloads[0].text).toBe("json-reply");
      expect(parsed.payloads[0].mediaUrl).toBe("http://x.test/a.jpg");
      expect(parsed.meta.durationMs).toBe(42);
    });
  });

  it("passes the message through as the agent prompt", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store);

      await agentCommand({ message: "ping", to: "+1333" }, runtime);

      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
      expect(callArgs?.prompt).toBe("ping");
    });
  });

  it("passes through telegram accountId when delivering", async () => {
    await withTempHome(async (home) => {
      const store = path.join(home, "sessions.json");
      mockConfig(home, store, undefined, undefined, { botToken: "t-1" });
      const deps = {
        sendMessageWhatsApp: vi.fn(),
        sendMessageTelegram: vi
          .fn()
          .mockResolvedValue({ messageId: "t1", chatId: "123" }),
        sendMessageDiscord: vi.fn(),
        sendMessageSignal: vi.fn(),
        sendMessageIMessage: vi.fn(),
      };

      const prevTelegramToken = process.env.TELEGRAM_BOT_TOKEN;
      process.env.TELEGRAM_BOT_TOKEN = "";
      try {
        await agentCommand(
          {
            message: "hi",
            to: "123",
            deliver: true,
            provider: "telegram",
          },
          runtime,
          deps,
        );

        expect(deps.sendMessageTelegram).toHaveBeenCalledWith(
          "123",
          "ok",
          expect.objectContaining({ accountId: undefined, verbose: false }),
        );
      } finally {
        if (prevTelegramToken === undefined) {
          delete process.env.TELEGRAM_BOT_TOKEN;
        } else {
          process.env.TELEGRAM_BOT_TOKEN = prevTelegramToken;
        }
      }
    });
  });
});