#!/usr/bin/env bun

/**
 * Tests the Forgejo API divergence in setupBranch().
 *
 * Forgejo uses repos.getBranch() to get source branch SHA because Forgejo's
 * /git/refs (plural) API differs from GitHub's /git/ref (singular), causing
 * git.getRef() to 404 on Forgejo.
 *
 * Approach: Call setupBranch() with mocked Octokit. The platform-specific
 * API call records that it was called, then throws a sentinel error to stop
 * execution before git shell commands run (avoiding real repo side effects).
 */

import {
  describe,
  test,
  expect,
  beforeEach,
  afterEach,
  spyOn,
  type Mock,
} from "bun:test";
import { setupBranch } from "../src/github/operations/branch";
import { _resetPlatformCache } from "../src/platform/detector";
import { createMockContext } from "./mockContext";
import type { Octokits } from "../src/github/api/client";
import type { FetchDataResult } from "../src/github/data/fetcher";

const mockGithubData: FetchDataResult = {
  contextData: {
    title: "Test issue",
    labels: { nodes: [{ name: "bug" }] },
  },
  comments: [],
  changedFiles: [],
  changedFilesWithSHA: [],
  reviewData: null,
  imageUrlMap: new Map(),
} as any;

function createBranchMockOctokits(
  overrides: Record<string, any> = {},
): Octokits {
  return {
    rest: {
      repos: {
        get:
          overrides.reposGet ??
          (async () => ({ data: { default_branch: "main" } })),
        getBranch:
          overrides.getBranch ??
          (async () => ({ data: { commit: { sha: "abc123" } } })),
      },
      git: {
        getRef:
          overrides.getRef ??
          (async () => ({ data: { object: { sha: "abc123" } } })),
      },
    },
    graphql: {} as any,
  } as unknown as Octokits;
}

describe("setupBranch — Forgejo API divergence", () => {
  let savedPlatform: string | undefined;
  let savedServerUrl: string | undefined;
  let consoleLogSpy: Mock<(...args: any[]) => void>;
  let consoleErrorSpy: Mock<(...args: any[]) => void>;

  beforeEach(() => {
    _resetPlatformCache();
    savedPlatform = process.env.PLATFORM;
    savedServerUrl = process.env.GITHUB_SERVER_URL;

    consoleLogSpy = spyOn(console, "log").mockImplementation(() => {});
    consoleErrorSpy = spyOn(console, "error").mockImplementation(() => {});
  });

  afterEach(() => {
    if (savedPlatform !== undefined) process.env.PLATFORM = savedPlatform;
    else delete process.env.PLATFORM;
    if (savedServerUrl !== undefined)
      process.env.GITHUB_SERVER_URL = savedServerUrl;
    else delete process.env.GITHUB_SERVER_URL;

    consoleLogSpy.mockRestore();
    consoleErrorSpy.mockRestore();
    _resetPlatformCache();
  });

  test("on Forgejo: calls repos.getBranch() instead of git.getRef()", async () => {
    process.env.PLATFORM = "forgejo";
    process.env.GITHUB_SERVER_URL = "https://git.example.com";
    _resetPlatformCache();

    let getBranchCalled = false;
    let getRefCalled = false;

    const mockOctokits = createBranchMockOctokits({
      getBranch: async () => {
        getBranchCalled = true;
        // Throw sentinel error to stop before git commands execute
        throw new Error("STOP_BEFORE_GIT_COMMANDS");
      },
      getRef: async () => {
        getRefCalled = true;
        throw new Error("STOP_BEFORE_GIT_COMMANDS");
      },
    });

    const context = createMockContext({ isPR: false, entityNumber: 1 });

    await expect(
      setupBranch(mockOctokits, mockGithubData, context),
    ).rejects.toThrow("STOP_BEFORE_GIT_COMMANDS");

    expect(getBranchCalled).toBe(true);
    expect(getRefCalled).toBe(false);
  });

  test("on GitHub: calls git.getRef() instead of repos.getBranch()", async () => {
    delete process.env.PLATFORM;
    process.env.GITHUB_SERVER_URL = "https://github.com";
    _resetPlatformCache();

    let getBranchCalled = false;
    let getRefCalled = false;

    const mockOctokits = createBranchMockOctokits({
      getBranch: async () => {
        getBranchCalled = true;
        throw new Error("STOP_BEFORE_GIT_COMMANDS");
      },
      getRef: async () => {
        getRefCalled = true;
        throw new Error("STOP_BEFORE_GIT_COMMANDS");
      },
    });

    const context = createMockContext({ isPR: false, entityNumber: 1 });

    await expect(
      setupBranch(mockOctokits, mockGithubData, context),
    ).rejects.toThrow("STOP_BEFORE_GIT_COMMANDS");

    expect(getRefCalled).toBe(true);
    expect(getBranchCalled).toBe(false);
  });
});