import { describe, expect, test, beforeEach, afterEach, beforeAll, afterAll } from "bun:test";
import { getAPIProvider, isFirstPartyAnthropicBaseUrl } from "../providers";
import { readFileSync, writeFileSync } from "fs";
import path from "path";
import { fileURLToPath } from "url";
import { homedir } from "os";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

function getSettingsPath(): string {
  return path.join(homedir(), ".claude", "settings.json");
}
import { afterEach, beforeEach, describe, expect, mock, test } from "bun:test";

let mockedModelType: "gemini" | undefined;

mock.module("../../settings/settings.js", () => ({
  getInitialSettings: () =>
    mockedModelType ? { modelType: mockedModelType } : {},
}));

const { getAPIProvider, isFirstPartyAnthropicBaseUrl } =
  await import("../providers");

describe("getAPIProvider", () => {
  const envKeys = [
    "CLAUDE_CODE_USE_GEMINI",
    "CLAUDE_CODE_USE_BEDROCK",
    "CLAUDE_CODE_USE_VERTEX",
    "CLAUDE_CODE_USE_FOUNDRY",
    "CLAUDE_CODE_USE_OPENAI",
  ] as const;
  const savedEnv: Record<string, string | undefined> = {};
  let originalSettings: string = "";

  beforeAll(() => {
    // Backup and clear settings.json modelType
    const settingsPath = getSettingsPath();
    try {
      originalSettings = readFileSync(settingsPath, "utf-8");
      const parsed = JSON.parse(originalSettings);
      delete parsed.modelType;
      writeFileSync(settingsPath, JSON.stringify(parsed, null, 2) + "\n");
    } catch (e) {
      // If file doesn't exist or can't parse, ignore
    }
  });

  afterAll(() => {
    // Restore original settings.json
    if (originalSettings) {
      writeFileSync(getSettingsPath(), originalSettings);
    }
  });

  beforeEach(() => {
    // Save and clear environment variables
    mockedModelType = undefined;
    for (const key of envKeys) {
      savedEnv[key] = process.env[key];
      delete process.env[key];
    }
  });

  afterEach(() => {
    // Restore environment variables
    mockedModelType = undefined;
    for (const key of envKeys) {
      if (savedEnv[key] !== undefined) {
        process.env[key] = savedEnv[key];
      } else {
        delete process.env[key];
      }
    }
  });

  test('returns "firstParty" by default', () => {
    expect(getAPIProvider()).toBe("firstParty");
  });

  test('returns "gemini" when modelType is gemini', () => {
    mockedModelType = "gemini";
    expect(getAPIProvider()).toBe("gemini");
  });

  test("modelType takes precedence over environment variables", () => {
    mockedModelType = "gemini";
    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
    expect(getAPIProvider()).toBe("gemini");
  });

  test('returns "gemini" when CLAUDE_CODE_USE_GEMINI is set', () => {
    process.env.CLAUDE_CODE_USE_GEMINI = "1";
    expect(getAPIProvider()).toBe("gemini");
  });

  test('returns "bedrock" when CLAUDE_CODE_USE_BEDROCK is set', () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
    expect(getAPIProvider()).toBe("bedrock");
  });

  test('returns "vertex" when CLAUDE_CODE_USE_VERTEX is set', () => {
    process.env.CLAUDE_CODE_USE_VERTEX = "1";
    expect(getAPIProvider()).toBe("vertex");
  });

  test('returns "foundry" when CLAUDE_CODE_USE_FOUNDRY is set', () => {
    process.env.CLAUDE_CODE_USE_FOUNDRY = "1";
    expect(getAPIProvider()).toBe("foundry");
  });

  test("bedrock takes precedence over gemini", () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
    process.env.CLAUDE_CODE_USE_GEMINI = "1";
    expect(getAPIProvider()).toBe("bedrock");
  });

  test("bedrock takes precedence over vertex", () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
    process.env.CLAUDE_CODE_USE_VERTEX = "1";
    expect(getAPIProvider()).toBe("bedrock");
  });

  test("bedrock wins when all three env vars are set", () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
    process.env.CLAUDE_CODE_USE_VERTEX = "1";
    process.env.CLAUDE_CODE_USE_FOUNDRY = "1";
    expect(getAPIProvider()).toBe("bedrock");
  });

  test('"true" is truthy', () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "true";
    expect(getAPIProvider()).toBe("bedrock");
  });

  test('"0" is not truthy', () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "0";
    expect(getAPIProvider()).toBe("firstParty");
  });

  test('empty string is not truthy', () => {
    process.env.CLAUDE_CODE_USE_BEDROCK = "";
    expect(getAPIProvider()).toBe("firstParty");
  });
});

describe("isFirstPartyAnthropicBaseUrl", () => {
  const originalBaseUrl = process.env.ANTHROPIC_BASE_URL;
  const originalUserType = process.env.USER_TYPE;

  afterEach(() => {
    if (originalBaseUrl !== undefined) {
      process.env.ANTHROPIC_BASE_URL = originalBaseUrl;
    } else {
      delete process.env.ANTHROPIC_BASE_URL;
    }
    if (originalUserType !== undefined) {
      process.env.USER_TYPE = originalUserType;
    } else {
      delete process.env.USER_TYPE;
    }
  });

  test("returns true when ANTHROPIC_BASE_URL is not set", () => {
    delete process.env.ANTHROPIC_BASE_URL;
    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
  });

  test("returns true for api.anthropic.com", () => {
    process.env.ANTHROPIC_BASE_URL = "https://api.anthropic.com";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
  });

  test("returns false for custom URL", () => {
    process.env.ANTHROPIC_BASE_URL = "https://my-proxy.com";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(false);
  });

  test("returns false for invalid URL", () => {
    process.env.ANTHROPIC_BASE_URL = "not-a-url";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(false);
  });

  test("returns true for staging URL when USER_TYPE is ant", () => {
    process.env.ANTHROPIC_BASE_URL = "https://api-staging.anthropic.com";
    process.env.USER_TYPE = "ant";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
  });

  test("returns true for URL with path", () => {
    process.env.ANTHROPIC_BASE_URL = "https://api.anthropic.com/v1";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
  });

  test("returns true for trailing slash", () => {
    process.env.ANTHROPIC_BASE_URL = "https://api.anthropic.com/";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(true);
  });

  test("returns false for subdomain attack", () => {
    process.env.ANTHROPIC_BASE_URL = "https://evil-api.anthropic.com";
    expect(isFirstPartyAnthropicBaseUrl()).toBe(false);
  });
});