import {
  describe,
  test,
  expect,
  beforeEach,
  spyOn,
  afterEach,
  mock,
} from "bun:test";
import type { Octokits } from "../../api/client";
import type { FetchDataResult } from "../../data/fetcher";
import type { ParsedGitHubContext } from "../../context";
import type { GitHubPullRequest, GitHubIssue } from "../../types";

// Mock the entire branch module to avoid executing shell commands
const mockSetupBranch = mock();

// Mock bun shell to prevent actual git commands
mock.module("bun", () => ({
  $: new Proxy(
    {},
    {
      get: () => async () => ({ text: async () => "" }),
    },
  ),
}));

// Mock @actions/core
mock.module("@actions/core", () => ({
  setOutput: mock(),
  info: mock(),
  warning: mock(),
  error: mock(),
}));

describe("setupBranch", () => {
  let mockOctokits: Octokits;
  let mockContext: ParsedGitHubContext;
  let mockGithubData: FetchDataResult;

  beforeEach(() => {
    mock.restore();

    // Mock the Octokits object with both rest and graphql
    mockOctokits = {
      rest: {
        repos: {
          get: mock(() =>
            Promise.resolve({
              data: { default_branch: "main" },
            }),
          ),
        },
        git: {
          getRef: mock(() =>
            Promise.resolve({
              data: {
                object: { sha: "abc123def456" },
              },
            }),
          ),
        },
      },
      graphql: mock(),
    } as any;

    // Create a base context
    mockContext = {
      runId: "12345",
      eventName: "pull_request",
      repository: {
        owner: "test-owner",
        repo: "test-repo",
        full_name: "test-owner/test-repo",
      },
      actor: "test-user",
      entityNumber: 42,
      isPR: true,
      inputs: {
        prompt: "",
        triggerPhrase: "@claude",
        assigneeTrigger: "",
        labelTrigger: "",
        baseBranch: "",
        branchPrefix: "claude/",
        useStickyComment: false,
        useCommitSigning: false,
        allowedBots: "",
        trackProgress: true,
      },
      payload: {} as any,
    };

    // Create mock GitHub data for a PR
    mockGithubData = {
      contextData: {
        headRefName: "feature/test-branch",
        baseRefName: "main",
        state: "OPEN",
        commits: {
          totalCount: 5,
        },
      } as GitHubPullRequest,
      comments: [],
      changedFiles: [],
      changedFilesWithSHA: [],
      reviewData: null,
      imageUrlMap: new Map(),
    };
  });

  describe("Branch operation test structure", () => {
    test("should handle PR context correctly", () => {
      // Verify PR context structure
      expect(mockContext.isPR).toBe(true);
      expect(mockContext.entityNumber).toBe(42);
      expect(mockGithubData.contextData).toHaveProperty("headRefName");
      expect(mockGithubData.contextData).toHaveProperty("baseRefName");
    });

    test("should handle issue context correctly", () => {
      // Convert to issue context
      mockContext.isPR = false;
      mockContext.eventName = "issues";
      mockGithubData.contextData = {
        title: "Test Issue",
        body: "Issue description",
      } as GitHubIssue;

      // Verify issue context structure
      expect(mockContext.isPR).toBe(false);
      expect(mockContext.eventName).toBe("issues");
      expect(mockGithubData.contextData).toHaveProperty("title");
      expect(mockGithubData.contextData).toHaveProperty("body");
    });

    test("should verify branch naming conventions", () => {
      const timestamp = new Date();
      const formattedTimestamp = `${timestamp.getFullYear()}${String(timestamp.getMonth() + 1).padStart(2, "0")}${String(timestamp.getDate()).padStart(2, "0")}-${String(timestamp.getHours()).padStart(2, "0")}${String(timestamp.getMinutes()).padStart(2, "0")}`;

      // Test PR branch name
      const prBranchName = `${mockContext.inputs.branchPrefix}pr-${mockContext.entityNumber}-${formattedTimestamp}`;
      expect(prBranchName).toMatch(/^claude\/pr-42-\d{8}-\d{4}$/);

      // Test issue branch name
      const issueBranchName = `${mockContext.inputs.branchPrefix}issue-${mockContext.entityNumber}-${formattedTimestamp}`;
      expect(issueBranchName).toMatch(/^claude\/issue-42-\d{8}-\d{4}$/);

      // Verify Kubernetes compatibility (lowercase, max 50 chars)
      const kubeName = prBranchName.toLowerCase().substring(0, 50);
      expect(kubeName).toMatch(/^[a-z0-9\/-]+$/);
      expect(kubeName.length).toBeLessThanOrEqual(50);
    });

    test("should handle different PR states", () => {
      const prData = mockGithubData.contextData as GitHubPullRequest;

      // Test open PR
      prData.state = "OPEN";
      expect(prData.state).toBe("OPEN");

      // Test closed PR
      prData.state = "CLOSED";
      expect(prData.state).toBe("CLOSED");

      // Test merged PR
      prData.state = "MERGED";
      expect(prData.state).toBe("MERGED");
    });

    test("should handle commit signing configuration", () => {
      // Without commit signing
      expect(mockContext.inputs.useCommitSigning).toBe(false);

      // With commit signing
      mockContext.inputs.useCommitSigning = true;
      expect(mockContext.inputs.useCommitSigning).toBe(true);
    });

    test("should handle custom base branch", () => {
      // Default (no base branch)
      expect(mockContext.inputs.baseBranch).toBe("");

      // Custom base branch
      mockContext.inputs.baseBranch = "develop";
      expect(mockContext.inputs.baseBranch).toBe("develop");
    });

    test("should verify Octokits structure", () => {
      expect(mockOctokits).toHaveProperty("rest");
      expect(mockOctokits).toHaveProperty("graphql");
      expect(mockOctokits.rest).toHaveProperty("repos");
      expect(mockOctokits.rest).toHaveProperty("git");
      expect(mockOctokits.rest.repos).toHaveProperty("get");
      expect(mockOctokits.rest.git).toHaveProperty("getRef");
    });

    test("should verify FetchDataResult structure", () => {
      expect(mockGithubData).toHaveProperty("contextData");
      expect(mockGithubData).toHaveProperty("comments");
      expect(mockGithubData).toHaveProperty("changedFiles");
      expect(mockGithubData).toHaveProperty("changedFilesWithSHA");
      expect(mockGithubData).toHaveProperty("reviewData");
      expect(mockGithubData).toHaveProperty("imageUrlMap");
    });

    test("should handle PR with varying commit counts", () => {
      const prData = mockGithubData.contextData as GitHubPullRequest;

      // Few commits
      prData.commits.totalCount = 5;
      const fetchDepthSmall = Math.max(prData.commits.totalCount, 20);
      expect(fetchDepthSmall).toBe(20);

      // Many commits
      prData.commits.totalCount = 150;
      const fetchDepthLarge = Math.max(prData.commits.totalCount, 20);
      expect(fetchDepthLarge).toBe(150);
    });

    test("should verify branch prefix customization", () => {
      // Default prefix
      expect(mockContext.inputs.branchPrefix).toBe("claude/");

      // Custom prefix
      mockContext.inputs.branchPrefix = "bot/";
      expect(mockContext.inputs.branchPrefix).toBe("bot/");

      // Another custom prefix
      mockContext.inputs.branchPrefix = "ai-assistant/";
      expect(mockContext.inputs.branchPrefix).toBe("ai-assistant/");
    });
  });
});