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

import type { AssistantMessage } from "@mariozechner/pi-ai";
import { beforeEach, describe, expect, it, vi } from "vitest";

import type { ClawdbotConfig } from "../config/config.js";
import type { EmbeddedRunAttemptResult } from "./pi-embedded-runner/run/types.js";

const runEmbeddedAttemptMock = vi.fn<Promise<EmbeddedRunAttemptResult>, [unknown]>();

vi.mock("./pi-embedded-runner/run/attempt.js", () => ({
  runEmbeddedAttempt: (params: unknown) => runEmbeddedAttemptMock(params),
}));

let runEmbeddedPiAgent: typeof import("./pi-embedded-runner.js").runEmbeddedPiAgent;

beforeEach(async () => {
  vi.useRealTimers();
  vi.resetModules();
  runEmbeddedAttemptMock.mockReset();
  ({ runEmbeddedPiAgent } = await import("./pi-embedded-runner.js"));
});

const baseUsage = {
  input: 0,
  output: 0,
  cacheRead: 0,
  cacheWrite: 0,
  totalTokens: 0,
  cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
};

const buildAssistant = (overrides: Partial<AssistantMessage>): AssistantMessage => ({
  role: "assistant",
  content: [],
  api: "openai-responses",
  provider: "openai",
  model: "mock-1",
  usage: baseUsage,
  stopReason: "stop",
  timestamp: Date.now(),
  ...overrides,
});

const makeAttempt = (overrides: Partial<EmbeddedRunAttemptResult>): EmbeddedRunAttemptResult => ({
  aborted: false,
  timedOut: false,
  promptError: null,
  sessionIdUsed: "session:test",
  systemPromptReport: undefined,
  messagesSnapshot: [],
  assistantTexts: [],
  toolMetas: [],
  lastAssistant: undefined,
  didSendViaMessagingTool: false,
  messagingToolSentTexts: [],
  messagingToolSentTargets: [],
  cloudCodeAssistFormatError: false,
  ...overrides,
});

const makeConfig = (): ClawdbotConfig =>
  ({
    agents: {
      defaults: {
        model: {
          fallbacks: [],
        },
      },
    },
    models: {
      providers: {
        openai: {
          api: "openai-responses",
          apiKey: "sk-test",
          baseUrl: "https://example.com",
          models: [
            {
              id: "mock-1",
              name: "Mock 1",
              reasoning: false,
              input: ["text"],
              cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
              contextWindow: 16_000,
              maxTokens: 2048,
            },
          ],
        },
      },
    },
  }) satisfies ClawdbotConfig;

const writeAuthStore = async (agentDir: string, opts?: { includeAnthropic?: boolean }) => {
  const authPath = path.join(agentDir, "auth-profiles.json");
  const payload = {
    version: 1,
    profiles: {
      "openai:p1": { type: "api_key", provider: "openai", key: "sk-one" },
      "openai:p2": { type: "api_key", provider: "openai", key: "sk-two" },
      ...(opts?.includeAnthropic
        ? { "anthropic:default": { type: "api_key", provider: "anthropic", key: "sk-anth" } }
        : {}),
    },
    usageStats: {
      "openai:p1": { lastUsed: 1 },
      "openai:p2": { lastUsed: 2 },
    },
  };
  await fs.writeFile(authPath, JSON.stringify(payload));
};

describe("runEmbeddedPiAgent auth profile rotation", () => {
  it("rotates for auto-pinned profiles", async () => {
    const agentDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-agent-"));
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-workspace-"));
    try {
      await writeAuthStore(agentDir);

      runEmbeddedAttemptMock
        .mockResolvedValueOnce(
          makeAttempt({
            assistantTexts: [],
            lastAssistant: buildAssistant({
              stopReason: "error",
              errorMessage: "rate limit",
            }),
          }),
        )
        .mockResolvedValueOnce(
          makeAttempt({
            assistantTexts: ["ok"],
            lastAssistant: buildAssistant({
              stopReason: "stop",
              content: [{ type: "text", text: "ok" }],
            }),
          }),
        );

      await runEmbeddedPiAgent({
        sessionId: "session:test",
        sessionKey: "agent:test:auto",
        sessionFile: path.join(workspaceDir, "session.jsonl"),
        workspaceDir,
        agentDir,
        config: makeConfig(),
        prompt: "hello",
        provider: "openai",
        model: "mock-1",
        authProfileId: "openai:p1",
        authProfileIdSource: "auto",
        timeoutMs: 5_000,
        runId: "run:auto",
      });

      expect(runEmbeddedAttemptMock).toHaveBeenCalledTimes(2);

      const stored = JSON.parse(
        await fs.readFile(path.join(agentDir, "auth-profiles.json"), "utf-8"),
      ) as { usageStats?: Record<string, { lastUsed?: number }> };
      expect(typeof stored.usageStats?.["openai:p2"]?.lastUsed).toBe("number");
    } finally {
      await fs.rm(agentDir, { recursive: true, force: true });
      await fs.rm(workspaceDir, { recursive: true, force: true });
    }
  });

  it("does not rotate for user-pinned profiles", async () => {
    const agentDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-agent-"));
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-workspace-"));
    try {
      await writeAuthStore(agentDir);

      runEmbeddedAttemptMock.mockResolvedValueOnce(
        makeAttempt({
          assistantTexts: [],
          lastAssistant: buildAssistant({
            stopReason: "error",
            errorMessage: "rate limit",
          }),
        }),
      );

      await runEmbeddedPiAgent({
        sessionId: "session:test",
        sessionKey: "agent:test:user",
        sessionFile: path.join(workspaceDir, "session.jsonl"),
        workspaceDir,
        agentDir,
        config: makeConfig(),
        prompt: "hello",
        provider: "openai",
        model: "mock-1",
        authProfileId: "openai:p1",
        authProfileIdSource: "user",
        timeoutMs: 5_000,
        runId: "run:user",
      });

      expect(runEmbeddedAttemptMock).toHaveBeenCalledTimes(1);

      const stored = JSON.parse(
        await fs.readFile(path.join(agentDir, "auth-profiles.json"), "utf-8"),
      ) as { usageStats?: Record<string, { lastUsed?: number }> };
      expect(stored.usageStats?.["openai:p2"]?.lastUsed).toBe(2);
    } finally {
      await fs.rm(agentDir, { recursive: true, force: true });
      await fs.rm(workspaceDir, { recursive: true, force: true });
    }
  });

  it("ignores user-locked profile when provider mismatches", async () => {
    const agentDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-agent-"));
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-workspace-"));
    try {
      await writeAuthStore(agentDir, { includeAnthropic: true });

      runEmbeddedAttemptMock.mockResolvedValueOnce(
        makeAttempt({
          assistantTexts: ["ok"],
          lastAssistant: buildAssistant({
            stopReason: "stop",
            content: [{ type: "text", text: "ok" }],
          }),
        }),
      );

      await runEmbeddedPiAgent({
        sessionId: "session:test",
        sessionKey: "agent:test:mismatch",
        sessionFile: path.join(workspaceDir, "session.jsonl"),
        workspaceDir,
        agentDir,
        config: makeConfig(),
        prompt: "hello",
        provider: "openai",
        model: "mock-1",
        authProfileId: "anthropic:default",
        authProfileIdSource: "user",
        timeoutMs: 5_000,
        runId: "run:mismatch",
      });

      expect(runEmbeddedAttemptMock).toHaveBeenCalledTimes(1);
    } finally {
      await fs.rm(agentDir, { recursive: true, force: true });
      await fs.rm(workspaceDir, { recursive: true, force: true });
    }
  });
});