import {
  IncrementType,
  Tag,
  GitService,
  CoreService,
  ConventionalCommitAnalyzer,
  TagService,
  TagIncrementer,
  LocalGitService,
  LocalCoreService,
} from "./main";

// Mock child_process.execSync
jest.mock("child_process", () => ({
  execSync: jest.fn(),
}));

import { execSync } from "child_process";
const mockExecSync = execSync as jest.MockedFunction<typeof execSync>;

// Mock interfaces for testing
class MockGitService implements GitService {
  constructor(
    private mockTags: { name: string }[] = [],
    private mockCommit: { commit: { message: string } } = { commit: { message: "test commit" } }
  ) {}

  async listTags(perPage: number): Promise<{ name: string }[]> {
    return this.mockTags.slice(0, perPage);
  }

  async getCommit(ref: string): Promise<{ commit: { message: string } }> {
    // Use ref parameter to avoid unused parameter warning
    if (!ref) {
      throw new Error("Ref is required");
    }
    return this.mockCommit;
  }

  async testConnection(): Promise<void> {
    // Mock successful connection
  }

  setMockTags(tags: { name: string }[]) {
    this.mockTags = tags;
  }

  setMockCommit(commit: { commit: { message: string } }) {
    this.mockCommit = commit;
  }
}

class MockCoreService implements CoreService {
  private inputs: Record<string, string> = {};
  private outputs: Record<string, string> = {};
  private logs: string[] = [];
  private warnings: string[] = [];
  private failures: string[] = [];

  setInput(name: string, value: string) {
    this.inputs[name] = value;
  }

  getInput(name: string): string {
    return this.inputs[name] || "";
  }

  info(message: string): void {
    this.logs.push(`INFO: ${message}`);
  }

  warning(message: string): void {
    this.warnings.push(`WARNING: ${message}`);
  }

  setOutput(name: string, value: string): void {
    this.outputs[name] = value;
  }

  setFailed(message: string): void {
    this.failures.push(message);
  }

  getOutputs(): Record<string, string> {
    return { ...this.outputs };
  }

  getLogs(): string[] {
    return [...this.logs];
  }

  getWarnings(): string[] {
    return [...this.warnings];
  }

  getFailures(): string[] {
    return [...this.failures];
  }

  clear() {
    this.outputs = {};
    this.logs = [];
    this.warnings = [];
    this.failures = [];
  }
}

describe("TagService", () => {
  let tagService: TagService;

  beforeEach(() => {
    tagService = new TagService();
  });

  describe("bumpTag", () => {
    const baseTag: Tag = { major: 1, minor: 2, patch: 3 };

    it("should increment major version", () => {
      const result = tagService.bumpTag(baseTag, IncrementType.MAJOR);
      expect(result).toEqual({ major: 2, minor: 0, patch: 0 });
    });

    it("should increment minor version", () => {
      const result = tagService.bumpTag(baseTag, IncrementType.MINOR);
      expect(result).toEqual({ major: 1, minor: 3, patch: 0 });
    });

    it("should increment patch version", () => {
      const result = tagService.bumpTag(baseTag, IncrementType.PATCH);
      expect(result).toEqual({ major: 1, minor: 2, patch: 4 });
    });

    it("should handle zero versions", () => {
      const zeroTag: Tag = { major: 0, minor: 0, patch: 0 };
      const result = tagService.bumpTag(zeroTag, IncrementType.MINOR);
      expect(result).toEqual({ major: 0, minor: 1, patch: 0 });
    });
  });

  describe("renderTag", () => {
    const tag: Tag = { major: 1, minor: 2, patch: 3 };

    it("should render tag without prefix", () => {
      const result = tagService.renderTag(tag);
      expect(result).toBe("1.2.3");
    });

    it("should render tag with prefix", () => {
      const result = tagService.renderTag(tag, "v");
      expect(result).toBe("v1.2.3");
    });

    it("should render tag with prerelease suffix", () => {
      const result = tagService.renderTag(tag, "", "-rc-abc123");
      expect(result).toBe("1.2.3-rc-abc123");
    });

    it("should render tag with prefix and prerelease suffix", () => {
      const result = tagService.renderTag(tag, "v", "-rc-abc123");
      expect(result).toBe("v1.2.3-rc-abc123");
    });
  });

  describe("parseTag", () => {
    it("should parse valid tag without prefix", () => {
      const result = tagService.parseTag("1.2.3");
      expect(result).toEqual({ major: 1, minor: 2, patch: 3 });
    });

    it("should parse valid tag with prefix", () => {
      const result = tagService.parseTag("v1.2.3");
      expect(result).toEqual({ major: 1, minor: 2, patch: 3 });
    });

    it("should throw error for invalid format", () => {
      expect(() => tagService.parseTag("invalid")).toThrow(
        "Invalid tag format: invalid. Expected semantic version (e.g., 1.2.3)"
      );
    });

    it("should throw error for non-numeric versions", () => {
      expect(() => tagService.parseTag("1.a.3")).toThrow(
        "Invalid tag format: 1.a.3. Expected semantic version (e.g., 1.2.3)"
      );
    });

    it("should throw error for incomplete version", () => {
      expect(() => tagService.parseTag("1.2")).toThrow(
        "Invalid tag format: 1.2. Expected semantic version (e.g., 1.2.3)"
      );
    });
  });
});

describe("TagIncrementer", () => {
  let tagIncrementer: TagIncrementer;
  let mockGitService: MockGitService;
  let mockCoreService: MockCoreService;
  let mockCommitAnalyzer: ConventionalCommitAnalyzer;
  let mockTagService: TagService;

  beforeEach(() => {
    mockGitService = new MockGitService();
    mockCoreService = new MockCoreService();
    mockCommitAnalyzer = new ConventionalCommitAnalyzer();
    mockTagService = new TagService();

    tagIncrementer = new TagIncrementer(
      mockGitService,
      mockCoreService,
      mockCommitAnalyzer,
      mockTagService
    );
  });

  afterEach(() => {
    mockCoreService.clear();
  });

  describe("getBaseTag", () => {
    it("should return provided tag when available", async () => {
      const result = await tagIncrementer.getBaseTag("v1.2.3");

      expect(result).toBe("v1.2.3");
      expect(mockCoreService.getLogs()).toContain("INFO: Using provided tag: v1.2.3");
    });

    it("should fetch latest tag when no tag provided", async () => {
      mockGitService.setMockTags([{ name: "v2.0.0" }]);

      const result = await tagIncrementer.getBaseTag(undefined);

      expect(result).toBe("v2.0.0");
      expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v2.0.0");
    });

    it("should default to 0.0.0 when no tags found", async () => {
      mockGitService.setMockTags([]);

      const result = await tagIncrementer.getBaseTag(undefined);

      expect(result).toBe("0.0.0");
      expect(mockCoreService.getWarnings()).toContain(
        "WARNING: No tags found in repository, defaulting to 0.0.0"
      );
    });

    it("should skip pre-release tags and use latest real tag", async () => {
      mockGitService.setMockTags([
        { name: "v2.0.0-rc-26035c6e13" },
        { name: "v1.2.3" },
        { name: "v1.1.4-rc-aa512edb16" },
        { name: "v1.0.0" },
      ]);

      const result = await tagIncrementer.getBaseTag(undefined);

      expect(result).toBe("v1.2.3");
      expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v1.2.3");
    });

    it("should default to 0.0.0 when only pre-release tags found", async () => {
      mockGitService.setMockTags([
        { name: "v2.0.0-rc-26035c6e13" },
        { name: "v1.1.4-rc-aa512edb16" },
      ]);

      const result = await tagIncrementer.getBaseTag(undefined);

      expect(result).toBe("0.0.0");
      expect(mockCoreService.getWarnings()).toContain(
        "WARNING: No real tags found (only pre-release tags), defaulting to 0.0.0"
      );
    });
  });

  describe("determineIncrementType", () => {
    it("should analyze commit and determine increment type", async () => {
      mockGitService.setMockCommit({
        commit: { message: "feat: new feature" },
      });

      const result = await tagIncrementer.determineIncrementType("ref");

      expect(result).toBe(IncrementType.MINOR);
    });

    it("should fallback to PATCH on an non-conventional commit message", async () => {
      mockGitService.setMockCommit({
        commit: { message: "just some tests, nothing special" },
      });

      const result = await tagIncrementer.determineIncrementType("ref");

      expect(result).toBe(IncrementType.PATCH);
    });
  });

  describe("incrementTag", () => {
    it("should increment tag correctly for patch increment", async () => {
      mockGitService.setMockTags([{ name: "v1.2.3" }]);
      mockGitService.setMockCommit({
        commit: { message: "fix: bug fix" },
      });

      const result = await tagIncrementer.incrementTag(undefined, "ref");

      expect(result).toBe("1.2.4");
      expect(mockCoreService.getOutputs()).toEqual({});
    });

    it("should increment tag correctly for minor increment", async () => {
      mockGitService.setMockTags([{ name: "v1.2.3" }]);
      mockGitService.setMockCommit({
        commit: { message: "feat: new feature" },
      });

      const result = await tagIncrementer.incrementTag(undefined, "ref");

      expect(result).toBe("1.3.0");
    });

    it("should increment tag correctly for major increment", async () => {
      mockGitService.setMockTags([{ name: "v1.2.3" }]);
      mockGitService.setMockCommit({
        commit: { message: "feat!: breaking change" },
      });

      const result = await tagIncrementer.incrementTag(undefined, "ref");

      expect(result).toBe("2.0.0");
    });

    it("should use provided tag when available", async () => {
      mockGitService.setMockCommit({
        commit: { message: "fix: bug fix" },
      });

      const result = await tagIncrementer.incrementTag("v2.1.0", "ref");

      expect(result).toBe("2.1.1");
    });

    it("should create prerelease tag when prerelease is true", async () => {
      mockGitService.setMockTags([{ name: "v1.2.3" }]);
      mockGitService.setMockCommit({
        commit: { message: "feat: new feature" },
      });

      const result = await tagIncrementer.incrementTag(undefined, "ref", 50, true, "abc123");

      expect(result).toBe("1.3.0-rc-abc123");
    });

    it("should not create prerelease tag when prerelease is false", async () => {
      mockGitService.setMockTags([{ name: "v1.2.3" }]);
      mockGitService.setMockCommit({
        commit: { message: "feat: new feature" },
      });

      const result = await tagIncrementer.incrementTag(undefined, "ref", 50, false, "abc123");

      expect(result).toBe("1.3.0");
    });
  });
});

describe("LocalGitService", () => {
  let localGitService: LocalGitService;

  beforeEach(() => {
    localGitService = new LocalGitService();
    mockExecSync.mockClear();
  });

  describe("listTags", () => {
    it("should call git command to list tags", async () => {
      mockExecSync.mockReturnValue("v1.0.0\n1.1.0\n2.0.0-rc-26035c6e13\n" as any);

      const result = await localGitService.listTags(5);

      expect(mockExecSync).toHaveBeenCalledWith("git tag --sort=-version:refname", {
        encoding: "utf8",
      });
      expect(result).toEqual([
        { name: "v1.0.0" },
        { name: "1.1.0" },
        { name: "2.0.0-rc-26035c6e13" },
      ]);
    });

    it("should return empty array when no tags exist", async () => {
      mockExecSync.mockReturnValue("" as any);

      const result = await localGitService.listTags(5);

      expect(result).toEqual([]);
    });
  });

  describe("getCommit", () => {
    it("should call git command to get commit", async () => {
      mockExecSync.mockReturnValue("test commit message" as any);

      const result = await localGitService.getCommit("abc123");

      expect(mockExecSync).toHaveBeenCalledWith("git log -1 --pretty=%B abc123", {
        encoding: "utf8",
      });
      expect(result).toEqual({ commit: { message: "test commit message" } });
    });
  });

  describe("testConnection", () => {
    it("should call git command to test connection", async () => {
      mockExecSync.mockReturnValue(".git" as any);

      await localGitService.testConnection();

      expect(mockExecSync).toHaveBeenCalledWith("git rev-parse --git-dir", { stdio: "pipe" });
    });

    it("should throw error when not in git repository", async () => {
      mockExecSync.mockImplementation(() => {
        throw new Error("fatal: not a git repository");
      });

      await expect(localGitService.testConnection()).rejects.toThrow(
        "Not in a git repository. Please ensure this action runs after checkout."
      );
    });
  });
});

describe("LocalCoreService", () => {
  let localCoreService: LocalCoreService;

  beforeEach(() => {
    localCoreService = new LocalCoreService();
  });

  // Note: These tests would require mocking the @actions/core module
  // In a real implementation, you might want to use jest.mock() to mock the entire module
  // For now, we'll just test that the methods exist and can be called

  it("should have all required methods", () => {
    expect(typeof localCoreService.getInput).toBe("function");
    expect(typeof localCoreService.info).toBe("function");
    expect(typeof localCoreService.warning).toBe("function");
    expect(typeof localCoreService.setOutput).toBe("function");
    expect(typeof localCoreService.setFailed).toBe("function");
  });
});

// Integration test example
describe("TagIncrementer Integration", () => {
  it("should handle complete tag increment flow", async () => {
    const mockGitService = new MockGitService(
      [{ name: "v2.0.0-rc-26035c6e13" }, { name: "v1.1.4-rc-aa512edb16" }, { name: "v1.2.3" }],
      {
        commit: { message: "feat: new feature" },
      }
    );
    const mockCoreService = new MockCoreService();
    const commitAnalyzer = new ConventionalCommitAnalyzer();
    const tagService = new TagService();

    const tagIncrementer = new TagIncrementer(
      mockGitService,
      mockCoreService,
      commitAnalyzer,
      tagService
    );

    const result = await tagIncrementer.incrementTag(undefined, "ref");

    expect(result).toBe("1.3.0");
    expect(mockCoreService.getLogs()).toContain("INFO: Determined increment type: minor");
    expect(mockCoreService.getLogs()).toContain("INFO: New tag: 1.3.0");
    expect(mockCoreService.getLogs()).toContain("INFO: Using latest real tag: v1.2.3");
  });
});

describe("Prerelease Validation", () => {
  it("should validate prerelease configuration correctly", () => {
    // Test cases for prerelease validation logic
    const testCases = [
      { prerelease: true, githubSha: "abc123", shouldFail: false },
      { prerelease: true, githubSha: "", shouldFail: true },
      { prerelease: false, githubSha: "abc123", shouldFail: false },
      { prerelease: false, githubSha: "", shouldFail: false },
    ];

    testCases.forEach(({ prerelease, githubSha, shouldFail }) => {
      const result = prerelease && !githubSha;
      expect(result).toBe(shouldFail);
    });
  });
});