import type { VcsStatusRemoteResult, VcsStatusResult } from "@t3tools/contracts";
import { assert, describe, expect, it } from "@effect/vitest";
import { Effect } from "effect";
import * as Random from "effect/Random";

import {
  applyGitStatusStreamEvent,
  buildTemporaryWorktreeBranchName,
  isTemporaryWorktreeBranch,
  normalizeGitRemoteUrl,
  parseGitHubRepositoryNameWithOwnerFromRemoteUrl,
  WORKTREE_BRANCH_PREFIX,
} from "./git.ts";

function deterministicRandom(seed = 0x1234_5678): {
  nextIntUnsafe: () => number;
  nextDoubleUnsafe: () => number;
} {
  let state = seed >>> 0;
  const nextIntUnsafe = (): number => {
    state = (Math.imul(1_664_525, state) + 1_013_904_223) >>> 0;
    return state;
  };

  return {
    nextIntUnsafe,
    nextDoubleUnsafe: () => nextIntUnsafe() / 0x1_0000_0000,
  };
}

describe("normalizeGitRemoteUrl", () => {
  it("canonicalizes equivalent GitHub remotes across protocol variants", () => {
    expect(normalizeGitRemoteUrl("git@github.com:T3Tools/T3Code.git")).toBe(
      "github.com/t3tools/t3code",
    );
    expect(normalizeGitRemoteUrl("https://github.com/T3Tools/T3Code.git")).toBe(
      "github.com/t3tools/t3code",
    );
    expect(normalizeGitRemoteUrl("ssh://git@github.com/T3Tools/T3Code")).toBe(
      "github.com/t3tools/t3code",
    );
  });

  it("preserves nested group paths for providers like GitLab", () => {
    expect(normalizeGitRemoteUrl("git@gitlab.com:T3Tools/platform/T3Code.git")).toBe(
      "gitlab.com/t3tools/platform/t3code",
    );
    expect(normalizeGitRemoteUrl("https://gitlab.com/T3Tools/platform/T3Code.git")).toBe(
      "gitlab.com/t3tools/platform/t3code",
    );
  });

  it("drops explicit ports from URL-shaped remotes", () => {
    expect(normalizeGitRemoteUrl("https://gitlab.company.com:8443/team/project.git")).toBe(
      "gitlab.company.com/team/project",
    );
    expect(normalizeGitRemoteUrl("ssh://git@gitlab.company.com:2222/team/project.git")).toBe(
      "gitlab.company.com/team/project",
    );
  });
});

describe("parseGitHubRepositoryNameWithOwnerFromRemoteUrl", () => {
  it("extracts the owner and repository from common GitHub remote shapes", () => {
    expect(
      parseGitHubRepositoryNameWithOwnerFromRemoteUrl("git@github.com:T3Tools/T3Code.git"),
    ).toBe("T3Tools/T3Code");
    expect(
      parseGitHubRepositoryNameWithOwnerFromRemoteUrl("https://github.com/T3Tools/T3Code.git"),
    ).toBe("T3Tools/T3Code");
  });
});

describe("isTemporaryWorktreeBranch", () => {
  it.effect("matches the generated temporary worktree refName format", () =>
    Effect.gen(function* () {
      const branch = yield* buildTemporaryWorktreeBranchName;
      assert.equal(isTemporaryWorktreeBranch(branch), true);
    }),
  );

  it.effect("uses the Effect Random service for deterministic temporary refs", () =>
    Effect.gen(function* () {
      const firstBranch = yield* buildTemporaryWorktreeBranchName.pipe(
        Effect.provideService(Random.Random, deterministicRandom()),
      );
      const secondBranch = yield* buildTemporaryWorktreeBranchName.pipe(
        Effect.provideService(Random.Random, deterministicRandom()),
      );

      assert.equal(firstBranch, secondBranch);
      assert.equal(isTemporaryWorktreeBranch(firstBranch), true);
    }),
  );

  it("matches generated temporary worktree refs", () => {
    expect(isTemporaryWorktreeBranch(`${WORKTREE_BRANCH_PREFIX}/deadbeef`)).toBe(true);
    expect(isTemporaryWorktreeBranch(` ${WORKTREE_BRANCH_PREFIX}/deadbeef `)).toBe(true);
    expect(isTemporaryWorktreeBranch(`${WORKTREE_BRANCH_PREFIX}/DEADBEEF`)).toBe(true);
  });

  it("rejects non-temporary refName names", () => {
    expect(isTemporaryWorktreeBranch(`${WORKTREE_BRANCH_PREFIX}/feature/demo`)).toBe(false);
    expect(isTemporaryWorktreeBranch("main")).toBe(false);
    expect(isTemporaryWorktreeBranch(`${WORKTREE_BRANCH_PREFIX}/deadbeef-extra`)).toBe(false);
  });
});

describe("applyGitStatusStreamEvent", () => {
  it("treats a remote-only update as a repository when local state is missing", () => {
    const remote: VcsStatusRemoteResult = {
      hasUpstream: true,
      aheadCount: 2,
      behindCount: 1,
      pr: null,
    };

    expect(applyGitStatusStreamEvent(null, { _tag: "remoteUpdated", remote })).toEqual({
      isRepo: true,
      hasPrimaryRemote: false,
      isDefaultRef: false,
      refName: null,
      hasWorkingTreeChanges: false,
      workingTree: { files: [], insertions: 0, deletions: 0 },
      hasUpstream: true,
      aheadCount: 2,
      behindCount: 1,
      pr: null,
    });
  });

  it("preserves local-only fields when applying a remote update", () => {
    const current: VcsStatusResult = {
      isRepo: true,
      sourceControlProvider: {
        kind: "github",
        name: "GitHub",
        baseUrl: "https://github.com",
      },
      hasPrimaryRemote: true,
      isDefaultRef: false,
      refName: "feature/demo",
      hasWorkingTreeChanges: true,
      workingTree: {
        files: [{ path: "src/demo.ts", insertions: 1, deletions: 0 }],
        insertions: 1,
        deletions: 0,
      },
      hasUpstream: false,
      aheadCount: 0,
      behindCount: 0,
      pr: null,
    };

    const remote: VcsStatusRemoteResult = {
      hasUpstream: true,
      aheadCount: 2,
      behindCount: 1,
      pr: null,
    };

    expect(applyGitStatusStreamEvent(current, { _tag: "remoteUpdated", remote })).toEqual({
      ...current,
      hasUpstream: true,
      aheadCount: 2,
      behindCount: 1,
      pr: null,
    });
  });
});