import * as assert from 'assert';
import * as sinon from 'sinon';
import vscode, { Position } from 'vscode';

import { HistoryTracker, IMark } from '../src/history/historyTracker';
import { Jump } from '../src/jumps/jump';
import { globalState } from '../src/state/globalState';
import { VimState } from '../src/state/vimState';

suite('historyTracker unit tests', () => {
  let sandbox: sinon.SinonSandbox;
  let historyTracker: HistoryTracker;
  const document = { fileName: 'file name' } as vscode.TextDocument;

  const retrieveLocalMark = (markName: string): IMark | undefined =>
    historyTracker.getLocalMarks().find((mark) => mark.name === markName);

  const retrieveFileMark = (markName: string): IMark | undefined =>
    historyTracker.getGlobalMarks().find((mark) => mark.name === markName);

  const setupVimState = () => sandbox.createStubInstance(VimState) as unknown as VimState;

  const setupHistoryTracker = (vimState = setupVimState()) => new HistoryTracker(vimState);

  const buildMockPosition = (): Position => sandbox.createStubInstance(Position);

  setup(() => {
    sandbox = sinon.createSandbox();
  });

  teardown(() => {
    sandbox.restore();
  });

  suite('addMark', () => {
    setup(() => {
      historyTracker = setupHistoryTracker();
    });

    test('can set previous context mark from single quote', () => {
      const spy = sandbox.spy(globalState.jumpTracker, 'recordJump');
      const position = buildMockPosition();
      const mockJump = new Jump({
        document,
        position,
      });
      sandbox.stub(Jump, 'fromStateNow').returns(mockJump);

      historyTracker.addMark(document, position, "'");

      sinon.assert.calledWith(spy, mockJump);
    });
    test('can set previous context mark from backtick', () => {
      const spy = sandbox.spy(globalState.jumpTracker, 'recordJump');
      const position = buildMockPosition();
      const mockJump = new Jump({
        document,
        position,
      });
      sandbox.stub(Jump, 'fromStateNow').returns(mockJump);

      historyTracker.addMark(document, position, '`');

      sinon.assert.calledWith(spy, mockJump);
    });

    test('can create lowercase mark', () => {
      const position = buildMockPosition();
      historyTracker.addMark(document, position, 'a');
      const mark = retrieveLocalMark('a');
      assert.notStrictEqual(mark, undefined, 'failed to store lowercase mark');
      if (mark !== undefined) {
        assert.strictEqual(mark.position, position);
        assert.strictEqual(mark.isUppercaseMark, false);
        assert.strictEqual(mark.document, undefined);
      }
    });

    test('can create uppercase mark', () => {
      const position = buildMockPosition();
      historyTracker.addMark(document, position, 'A');
      const mark = retrieveFileMark('A');
      assert.notStrictEqual(mark, undefined, 'failed to store file mark');
      if (mark !== undefined) {
        assert.strictEqual(mark.position, position);
        assert.strictEqual(mark.isUppercaseMark, true);
        assert.strictEqual(mark.document, document);
      }
    });

    test('shares uppercase marks between editor instances', () => {
      const position = buildMockPosition();
      const firstHistoryTrackerInstance = historyTracker;
      const otherHistoryTrackerInstance = setupHistoryTracker(setupVimState());
      assert.notStrictEqual(firstHistoryTrackerInstance, otherHistoryTrackerInstance);
      otherHistoryTrackerInstance.addMark(document, position, 'A');
      const mark = retrieveFileMark('A');
      assert.notStrictEqual(mark, undefined);
      if (mark !== undefined) {
        assert.strictEqual(position, mark.position);
      }
    });

    test('does not share lower marks between editor instances', () => {
      const position = buildMockPosition();
      const firstHistoryTrackerInstance = historyTracker;
      const otherHistoryTrackerInstance = setupHistoryTracker(setupVimState());
      assert.notStrictEqual(firstHistoryTrackerInstance, otherHistoryTrackerInstance);
      otherHistoryTrackerInstance.addMark(document, position, 'a');
      const mark = retrieveLocalMark('a');
      assert.strictEqual(mark, undefined);
    });
  });

  suite('removeLocalMarks', () => {
    setup(() => {
      historyTracker = setupHistoryTracker();
    });

    test('removes only local marks', () => {
      const position = buildMockPosition();
      historyTracker.addMark(document, position, 'a');
      historyTracker.addMark(document, position, 'A');
      const mark = historyTracker.getMark('A');

      historyTracker.removeLocalMarks();

      assert.strictEqual(historyTracker.getMark('a'), undefined);
      assert.strictEqual(historyTracker.getMark('A'), mark);
    });
  });

  suite('removeMarks', () => {
    setup(() => {
      historyTracker = setupHistoryTracker();
    });

    test('removes multiple local and global', () => {
      const position = buildMockPosition();
      const markTargets = 'AHZced'.split('');

      markTargets.forEach((m) => historyTracker.addMark(document, position, m));

      historyTracker.removeMarks(markTargets);

      markTargets.forEach((m) => assert.strictEqual(historyTracker.getMark(m), undefined));
    });

    test("does not remove ''", () => {
      const position = buildMockPosition();
      historyTracker.addMark(document, position, '');
      const mark = historyTracker.getMark('');

      historyTracker.removeMarks(['']);

      assert.strictEqual(mark, historyTracker.getMark(''));
    });

    test('does nothing on empty', () => {
      const position = buildMockPosition();
      historyTracker.addMark(document, position, 'a');
      const mark = historyTracker.getMark('a');

      historyTracker.removeMarks([]);

      assert.strictEqual(mark, historyTracker.getMark('a'));
    });
  });
});

class TextEditorStub implements vscode.TextEditor {
  readonly document!: vscode.TextDocument;
  selection!: vscode.Selection;
  selections!: vscode.Selection[];
  readonly visibleRanges!: vscode.Range[];
  options!: vscode.TextEditorOptions;
  readonly viewColumn!: vscode.ViewColumn;

  constructor() {
    // NoOp
  }
  async edit(
    callback: (editBuilder: vscode.TextEditorEdit) => void,
    options?: { undoStopBefore: boolean; undoStopAfter: boolean },
  ) {
    return true;
  }
  async insertSnippet(
    snippet: vscode.SnippetString,
    location?: vscode.Position | vscode.Range | readonly Position[] | readonly vscode.Range[],
    options?: { undoStopBefore: boolean; undoStopAfter: boolean },
  ) {
    return true;
  }
  setDecorations(
    decorationType: vscode.TextEditorDecorationType,
    rangesOrOptions: vscode.Range[] | vscode.DecorationOptions[],
  ) {
    // NoOp
  }
  revealRange(range: vscode.Range, revealType?: vscode.TextEditorRevealType) {
    // NoOp
  }
  show(column?: vscode.ViewColumn) {
    // NoOp
  }
  hide() {
    // NoOp
  }
}