/**
 * Test for compaction with thinking models.
 *
 * Tests both:
 * - Claude via Antigravity (google-gemini-cli API)
 * - Claude via real Anthropic API (anthropic-messages API)
 *
 * Reproduces issue where compact fails when maxTokens < thinkingBudget.
 */

import { existsSync, mkdirSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { Agent, type ThinkingLevel } from "@mariozechner/pi-agent-core";
import { getModel, type Model } from "@mariozechner/pi-ai";
import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
import { AgentSession } from "../src/core/agent-session.js";
import { ModelRegistry } from "../src/core/model-registry.js";
import { SessionManager } from "../src/core/session-manager.js";
import { SettingsManager } from "../src/core/settings-manager.js";
import { codingTools } from "../src/core/tools/index.js";
import {
  API_KEY,
  createTestResourceLoader,
  getRealAuthStorage,
  hasAuthForProvider,
  resolveApiKey,
} from "./utilities.js";

// Check for auth
const HAS_ANTIGRAVITY_AUTH = hasAuthForProvider("google-antigravity");
const HAS_ANTHROPIC_AUTH = !!API_KEY;

describe.skipIf(!HAS_ANTIGRAVITY_AUTH)(
  "Compaction with thinking models (Antigravity)",
  () => {
    let session: AgentSession;
    let tempDir: string;
    let apiKey: string;

    beforeAll(async () => {
      const key = await resolveApiKey("google-antigravity");
      if (!key) throw new Error("Failed to resolve google-antigravity API key");
      apiKey = key;
    });

    beforeEach(() => {
      tempDir = join(tmpdir(), `pi-thinking-compaction-test-${Date.now()}`);
      mkdirSync(tempDir, { recursive: true });
    });

    afterEach(async () => {
      if (session) {
        session.dispose();
      }
      if (tempDir && existsSync(tempDir)) {
        rmSync(tempDir, { recursive: true });
      }
    });

    function createSession(
      modelId: "claude-opus-4-5-thinking" | "claude-sonnet-4-5",
      thinkingLevel: ThinkingLevel = "high",
    ) {
      const model = getModel("google-antigravity", modelId);
      if (!model) {
        throw new Error(`Model not found: google-antigravity/${modelId}`);
      }

      const agent = new Agent({
        getApiKey: () => apiKey,
        initialState: {
          model,
          systemPrompt: "You are a helpful assistant. Be concise.",
          tools: codingTools,
          thinkingLevel,
        },
      });

      const sessionManager = SessionManager.inMemory();
      const settingsManager = SettingsManager.create(tempDir, tempDir);
      // Use minimal keepRecentTokens so small test conversations have something to summarize
      // settingsManager.applyOverrides({ compaction: { keepRecentTokens: 1 } });

      const authStorage = getRealAuthStorage();
      const modelRegistry = new ModelRegistry(authStorage);

      session = new AgentSession({
        agent,
        sessionManager,
        settingsManager,
        cwd: tempDir,
        modelRegistry,
        resourceLoader: createTestResourceLoader(),
      });

      session.subscribe(() => {});

      return session;
    }

    it("should compact successfully with claude-opus-4-5-thinking and thinking level high", async () => {
      createSession("claude-opus-4-5-thinking", "high");

      // Send a simple prompt
      await session.prompt("Write down the first 10 prime numbers.");
      await session.agent.waitForIdle();

      // Verify we got a response
      const messages = session.messages;
      expect(messages.length).toBeGreaterThan(0);

      const assistantMessages = messages.filter((m) => m.role === "assistant");
      expect(assistantMessages.length).toBeGreaterThan(0);

      // Now try to compact - this should not throw
      const result = await session.compact();

      expect(result.summary).toBeDefined();
      expect(result.summary.length).toBeGreaterThan(0);
      expect(result.tokensBefore).toBeGreaterThan(0);

      // Verify session is still usable after compaction
      const messagesAfterCompact = session.messages;
      expect(messagesAfterCompact.length).toBeGreaterThan(0);
      expect(messagesAfterCompact[0].role).toBe("compactionSummary");
    }, 180000);

    it("should compact successfully with claude-sonnet-4-5 (non-thinking) for comparison", async () => {
      createSession("claude-sonnet-4-5", "off");

      await session.prompt("Write down the first 10 prime numbers.");
      await session.agent.waitForIdle();

      const messages = session.messages;
      expect(messages.length).toBeGreaterThan(0);

      const result = await session.compact();

      expect(result.summary).toBeDefined();
      expect(result.summary.length).toBeGreaterThan(0);
    }, 180000);
  },
);

// ============================================================================
// Real Anthropic API tests (for comparison)
// ============================================================================

describe.skipIf(!HAS_ANTHROPIC_AUTH)(
  "Compaction with thinking models (Anthropic)",
  () => {
    let session: AgentSession;
    let tempDir: string;

    beforeEach(() => {
      tempDir = join(
        tmpdir(),
        `pi-thinking-compaction-anthropic-test-${Date.now()}`,
      );
      mkdirSync(tempDir, { recursive: true });
    });

    afterEach(async () => {
      if (session) {
        session.dispose();
      }
      if (tempDir && existsSync(tempDir)) {
        rmSync(tempDir, { recursive: true });
      }
    });

    function createSession(
      model: Model<any>,
      thinkingLevel: ThinkingLevel = "high",
    ) {
      const agent = new Agent({
        getApiKey: () => API_KEY,
        initialState: {
          model,
          systemPrompt: "You are a helpful assistant. Be concise.",
          tools: codingTools,
          thinkingLevel,
        },
      });

      const sessionManager = SessionManager.inMemory();
      const settingsManager = SettingsManager.create(tempDir, tempDir);

      const authStorage = getRealAuthStorage();
      const modelRegistry = new ModelRegistry(authStorage);

      session = new AgentSession({
        agent,
        sessionManager,
        settingsManager,
        cwd: tempDir,
        modelRegistry,
        resourceLoader: createTestResourceLoader(),
      });

      session.subscribe(() => {});

      return session;
    }

    it("should compact successfully with claude-3-7-sonnet and thinking level high", async () => {
      const model = getModel("anthropic", "claude-3-7-sonnet-latest")!;
      createSession(model, "high");

      // Send a simple prompt
      await session.prompt("Write down the first 10 prime numbers.");
      await session.agent.waitForIdle();

      // Verify we got a response
      const messages = session.messages;
      expect(messages.length).toBeGreaterThan(0);

      const assistantMessages = messages.filter((m) => m.role === "assistant");
      expect(assistantMessages.length).toBeGreaterThan(0);

      // Now try to compact - this should not throw
      const result = await session.compact();

      expect(result.summary).toBeDefined();
      expect(result.summary.length).toBeGreaterThan(0);
      expect(result.tokensBefore).toBeGreaterThan(0);

      // Verify session is still usable after compaction
      const messagesAfterCompact = session.messages;
      expect(messagesAfterCompact.length).toBeGreaterThan(0);
      expect(messagesAfterCompact[0].role).toBe("compactionSummary");
    }, 180000);
  },
);