import { describe, expect, it } from "vitest";
import { getModel } from "../src/models.js";
import { complete, stream } from "../src/stream.js";
import type { Api, Context, Model, StreamOptions } from "../src/types.js";

type StreamOptionsWithExtras = StreamOptions & Record<string, unknown>;

import {
  hasAzureOpenAICredentials,
  resolveAzureDeploymentName,
} from "./azure-utils.js";
import { hasBedrockCredentials } from "./bedrock-utils.js";
import { resolveApiKey } from "./oauth.js";

// Resolve OAuth tokens at module level (async, runs before tests)
const [geminiCliToken, openaiCodexToken] = await Promise.all([
  resolveApiKey("google-gemini-cli"),
  resolveApiKey("openai-codex"),
]);

async function testAbortSignal<TApi extends Api>(
  llm: Model<TApi>,
  options: StreamOptionsWithExtras = {},
) {
  const context: Context = {
    messages: [
      {
        role: "user",
        content:
          "What is 15 + 27? Think step by step. Then list 50 first names.",
        timestamp: Date.now(),
      },
    ],
    systemPrompt: "You are a helpful assistant.",
  };

  let abortFired = false;
  let text = "";
  const controller = new AbortController();
  const response = await stream(llm, context, {
    ...options,
    signal: controller.signal,
  });
  for await (const event of response) {
    if (abortFired) return;
    if (event.type === "text_delta" || event.type === "thinking_delta") {
      text += event.delta;
    }
    if (text.length >= 50) {
      controller.abort();
      abortFired = true;
    }
  }
  const msg = await response.result();

  // If we get here without throwing, the abort didn't work
  expect(msg.stopReason).toBe("aborted");
  expect(msg.content.length).toBeGreaterThan(0);

  context.messages.push(msg);
  context.messages.push({
    role: "user",
    content: "Please continue, but only generate 5 names.",
    timestamp: Date.now(),
  });

  const followUp = await complete(llm, context, options);
  expect(followUp.stopReason).toBe("stop");
  expect(followUp.content.length).toBeGreaterThan(0);
}

async function testImmediateAbort<TApi extends Api>(
  llm: Model<TApi>,
  options: StreamOptionsWithExtras = {},
) {
  const controller = new AbortController();

  controller.abort();

  const context: Context = {
    messages: [{ role: "user", content: "Hello", timestamp: Date.now() }],
  };

  const response = await complete(llm, context, {
    ...options,
    signal: controller.signal,
  });
  expect(response.stopReason).toBe("aborted");
}

async function testAbortThenNewMessage<TApi extends Api>(
  llm: Model<TApi>,
  options: StreamOptionsWithExtras = {},
) {
  // First request: abort immediately before any response content arrives
  const controller = new AbortController();
  controller.abort();

  const context: Context = {
    messages: [
      { role: "user", content: "Hello, how are you?", timestamp: Date.now() },
    ],
  };

  const abortedResponse = await complete(llm, context, {
    ...options,
    signal: controller.signal,
  });
  expect(abortedResponse.stopReason).toBe("aborted");
  // The aborted message has empty content since we aborted before anything arrived
  expect(abortedResponse.content.length).toBe(0);

  // Add the aborted assistant message to context (this is what happens in the real coding agent)
  context.messages.push(abortedResponse);

  // Second request: send a new message - this should work even with the aborted message in context
  context.messages.push({
    role: "user",
    content: "What is 2 + 2?",
    timestamp: Date.now(),
  });

  const followUp = await complete(llm, context, options);
  expect(followUp.stopReason).toBe("stop");
  expect(followUp.content.length).toBeGreaterThan(0);
}

describe("AI Providers Abort Tests", () => {
  describe.skipIf(!process.env.GEMINI_API_KEY)("Google Provider Abort", () => {
    const llm = getModel("google", "gemini-2.5-flash");

    it("should abort mid-stream", { retry: 3 }, async () => {
      await testAbortSignal(llm, { thinking: { enabled: true } });
    });

    it("should handle immediate abort", { retry: 3 }, async () => {
      await testImmediateAbort(llm, { thinking: { enabled: true } });
    });
  });

  describe.skipIf(!process.env.OPENAI_API_KEY)(
    "OpenAI Completions Provider Abort",
    () => {
      const { compat: _compat, ...baseModel } = getModel(
        "openai",
        "gpt-4o-mini",
      )!;
      void _compat;
      const llm: Model<"openai-completions"> = {
        ...baseModel,
        api: "openai-completions",
      };

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  describe.skipIf(!process.env.OPENAI_API_KEY)(
    "OpenAI Responses Provider Abort",
    () => {
      const llm = getModel("openai", "gpt-5-mini");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  describe.skipIf(!hasAzureOpenAICredentials())(
    "Azure OpenAI Responses Provider Abort",
    () => {
      const llm = getModel("azure-openai-responses", "gpt-4o-mini");
      const azureDeploymentName = resolveAzureDeploymentName(llm.id);
      const azureOptions = azureDeploymentName ? { azureDeploymentName } : {};

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm, azureOptions);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm, azureOptions);
      });
    },
  );

  describe.skipIf(!process.env.ANTHROPIC_OAUTH_TOKEN)(
    "Anthropic Provider Abort",
    () => {
      const llm = getModel("anthropic", "claude-opus-4-1-20250805");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm, {
          thinkingEnabled: true,
          thinkingBudgetTokens: 2048,
        });
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm, {
          thinkingEnabled: true,
          thinkingBudgetTokens: 2048,
        });
      });
    },
  );

  describe.skipIf(!process.env.MISTRAL_API_KEY)(
    "Mistral Provider Abort",
    () => {
      const llm = getModel("mistral", "devstral-medium-latest");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  describe.skipIf(!process.env.MINIMAX_API_KEY)(
    "MiniMax Provider Abort",
    () => {
      const llm = getModel("minimax", "MiniMax-M2.1");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  describe.skipIf(!process.env.KIMI_API_KEY)(
    "Kimi For Coding Provider Abort",
    () => {
      const llm = getModel("kimi-coding", "kimi-k2-thinking");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  describe.skipIf(!process.env.AI_GATEWAY_API_KEY)(
    "Vercel AI Gateway Provider Abort",
    () => {
      const llm = getModel("vercel-ai-gateway", "google/gemini-2.5-flash");

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm);
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });
    },
  );

  // Google Gemini CLI / Antigravity share the same provider, so one test covers both
  describe("Google Gemini CLI Provider Abort", () => {
    it.skipIf(!geminiCliToken)(
      "should abort mid-stream",
      { retry: 3 },
      async () => {
        const llm = getModel("google-gemini-cli", "gemini-2.5-flash");
        await testAbortSignal(llm, { apiKey: geminiCliToken });
      },
    );

    it.skipIf(!geminiCliToken)(
      "should handle immediate abort",
      { retry: 3 },
      async () => {
        const llm = getModel("google-gemini-cli", "gemini-2.5-flash");
        await testImmediateAbort(llm, { apiKey: geminiCliToken });
      },
    );
  });

  describe("OpenAI Codex Provider Abort", () => {
    it.skipIf(!openaiCodexToken)(
      "should abort mid-stream",
      { retry: 3 },
      async () => {
        const llm = getModel("openai-codex", "gpt-5.2-codex");
        await testAbortSignal(llm, { apiKey: openaiCodexToken });
      },
    );

    it.skipIf(!openaiCodexToken)(
      "should handle immediate abort",
      { retry: 3 },
      async () => {
        const llm = getModel("openai-codex", "gpt-5.2-codex");
        await testImmediateAbort(llm, { apiKey: openaiCodexToken });
      },
    );
  });

  describe.skipIf(!hasBedrockCredentials())(
    "Amazon Bedrock Provider Abort",
    () => {
      const llm = getModel(
        "amazon-bedrock",
        "global.anthropic.claude-sonnet-4-5-20250929-v1:0",
      );

      it("should abort mid-stream", { retry: 3 }, async () => {
        await testAbortSignal(llm, { reasoning: "medium" });
      });

      it("should handle immediate abort", { retry: 3 }, async () => {
        await testImmediateAbort(llm);
      });

      it("should handle abort then new message", { retry: 3 }, async () => {
        await testAbortThenNewMessage(llm);
      });
    },
  );
});
