/**
 * @license
 * Copyright 2016 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import '../../../test/common-test-setup';
import {GrDiffLine, GrDiffLineType, BLANK_LINE} from './gr-diff-line';
import {
  GrDiffGroup,
  GrDiffGroupType,
  hideInContextControl,
} from './gr-diff-group';
import {assert} from '@open-wc/testing';

suite('gr-diff-group tests', () => {
  test('delta line pairs', () => {
    const l1 = new GrDiffLine(GrDiffLineType.ADD, 0, 128);
    const l2 = new GrDiffLine(GrDiffLineType.ADD, 0, 129);
    const l3 = new GrDiffLine(GrDiffLineType.REMOVE, 64, 0);
    let group = new GrDiffGroup({
      type: GrDiffGroupType.DELTA,
      lines: [l1, l2, l3],
    });
    assert.deepEqual(group.lines, [l1, l2, l3]);
    assert.deepEqual(group.adds, [l1, l2]);
    assert.deepEqual(group.removes, [l3]);
    assert.deepEqual(group.lineRange, {
      left: {start_line: 64, end_line: 64},
      right: {start_line: 128, end_line: 129},
    });

    let pairs = group.getSideBySidePairs();
    assert.deepEqual(pairs, [
      {left: l3, right: l1},
      {left: BLANK_LINE, right: l2},
    ]);

    group = new GrDiffGroup({type: GrDiffGroupType.DELTA, lines: [l1, l2, l3]});
    assert.deepEqual(group.lines, [l1, l2, l3]);
    assert.deepEqual(group.adds, [l1, l2]);
    assert.deepEqual(group.removes, [l3]);

    pairs = group.getSideBySidePairs();
    assert.deepEqual(pairs, [
      {left: l3, right: l1},
      {left: BLANK_LINE, right: l2},
    ]);
  });

  test('group must have lines', () => {
    try {
      new GrDiffGroup({type: GrDiffGroupType.BOTH});
    } catch (e) {
      // expected
      return;
    }
    assert.fail('a standard diff group cannot be empty');
  });

  test('group/header line pairs', () => {
    const l1 = new GrDiffLine(GrDiffLineType.BOTH, 64, 128);
    const l2 = new GrDiffLine(GrDiffLineType.BOTH, 65, 129);
    const l3 = new GrDiffLine(GrDiffLineType.BOTH, 66, 130);

    const group = new GrDiffGroup({
      type: GrDiffGroupType.BOTH,
      lines: [l1, l2, l3],
    });

    assert.deepEqual(group.lines, [l1, l2, l3]);
    assert.deepEqual(group.adds, []);
    assert.deepEqual(group.removes, []);

    assert.deepEqual(group.lineRange, {
      left: {start_line: 64, end_line: 66},
      right: {start_line: 128, end_line: 130},
    });

    const pairs = group.getSideBySidePairs();
    assert.deepEqual(pairs, [
      {left: l1, right: l1},
      {left: l2, right: l2},
      {left: l3, right: l3},
    ]);
  });

  test('adding delta lines to non-delta group', () => {
    const l1 = new GrDiffLine(GrDiffLineType.ADD);
    const l2 = new GrDiffLine(GrDiffLineType.REMOVE);
    const l3 = new GrDiffLine(GrDiffLineType.BOTH);

    assert.throws(
      () => new GrDiffGroup({type: GrDiffGroupType.BOTH, lines: [l1, l2, l3]})
    );
  });

  suite('hideInContextControl', () => {
    let groups: GrDiffGroup[];
    setup(() => {
      groups = [
        new GrDiffGroup({
          type: GrDiffGroupType.BOTH,
          lines: [
            new GrDiffLine(GrDiffLineType.BOTH, 5, 7),
            new GrDiffLine(GrDiffLineType.BOTH, 6, 8),
            new GrDiffLine(GrDiffLineType.BOTH, 7, 9),
          ],
        }),
        new GrDiffGroup({
          type: GrDiffGroupType.DELTA,
          lines: [
            new GrDiffLine(GrDiffLineType.REMOVE, 8),
            new GrDiffLine(GrDiffLineType.ADD, 0, 10),
            new GrDiffLine(GrDiffLineType.REMOVE, 9),
            new GrDiffLine(GrDiffLineType.ADD, 0, 11),
            new GrDiffLine(GrDiffLineType.REMOVE, 10),
            new GrDiffLine(GrDiffLineType.ADD, 0, 12),
            new GrDiffLine(GrDiffLineType.REMOVE, 11),
            new GrDiffLine(GrDiffLineType.ADD, 0, 13),
          ],
        }),
        new GrDiffGroup({
          type: GrDiffGroupType.BOTH,
          lines: [
            new GrDiffLine(GrDiffLineType.BOTH, 12, 14),
            new GrDiffLine(GrDiffLineType.BOTH, 13, 15),
            new GrDiffLine(GrDiffLineType.BOTH, 14, 16),
          ],
        }),
      ];
    });

    test('hides hidden groups in context control', () => {
      const collapsedGroups = hideInContextControl(groups, 3, 7);
      assert.equal(collapsedGroups.length, 3);

      assert.equal(collapsedGroups[0], groups[0]);

      assert.equal(collapsedGroups[1].type, GrDiffGroupType.CONTEXT_CONTROL);
      assert.equal(collapsedGroups[1].contextGroups.length, 1);
      assert.equal(collapsedGroups[1].contextGroups[0], groups[1]);

      assert.equal(collapsedGroups[2], groups[2]);
    });

    test('splits partially hidden groups', () => {
      const collapsedGroups = hideInContextControl(groups, 4, 8);
      assert.equal(collapsedGroups.length, 4);
      assert.equal(collapsedGroups[0], groups[0]);

      assert.equal(collapsedGroups[1].type, GrDiffGroupType.DELTA);
      assert.deepEqual(collapsedGroups[1].adds, [groups[1].adds[0]]);
      assert.deepEqual(collapsedGroups[1].removes, [groups[1].removes[0]]);

      assert.equal(collapsedGroups[2].type, GrDiffGroupType.CONTEXT_CONTROL);
      assert.equal(collapsedGroups[2].contextGroups.length, 2);

      assert.equal(
        collapsedGroups[2].contextGroups[0].type,
        GrDiffGroupType.DELTA
      );
      assert.deepEqual(
        collapsedGroups[2].contextGroups[0].adds,
        groups[1].adds.slice(1)
      );
      assert.deepEqual(
        collapsedGroups[2].contextGroups[0].removes,
        groups[1].removes.slice(1)
      );

      assert.equal(
        collapsedGroups[2].contextGroups[1].type,
        GrDiffGroupType.BOTH
      );
      assert.deepEqual(collapsedGroups[2].contextGroups[1].lines, [
        groups[2].lines[0],
      ]);

      assert.equal(collapsedGroups[3].type, GrDiffGroupType.BOTH);
      assert.deepEqual(collapsedGroups[3].lines, groups[2].lines.slice(1));
    });

    suite('with skip chunks', () => {
      setup(() => {
        const skipGroup = new GrDiffGroup({
          type: GrDiffGroupType.BOTH,
          skip: 60,
          offsetLeft: 8,
          offsetRight: 10,
        });
        groups = [
          new GrDiffGroup({
            type: GrDiffGroupType.BOTH,
            lines: [
              new GrDiffLine(GrDiffLineType.BOTH, 5, 7),
              new GrDiffLine(GrDiffLineType.BOTH, 6, 8),
              new GrDiffLine(GrDiffLineType.BOTH, 7, 9),
            ],
          }),
          skipGroup,
          new GrDiffGroup({
            type: GrDiffGroupType.BOTH,
            lines: [
              new GrDiffLine(GrDiffLineType.BOTH, 68, 70),
              new GrDiffLine(GrDiffLineType.BOTH, 69, 71),
              new GrDiffLine(GrDiffLineType.BOTH, 70, 72),
            ],
          }),
        ];
      });

      test('refuses to split skip group when closer to before', () => {
        const collapsedGroups = hideInContextControl(groups, 4, 10);
        assert.deepEqual(groups, collapsedGroups);
      });
    });

    test('groups unchanged if the hidden range is empty', () => {
      assert.deepEqual(hideInContextControl(groups, 0, 0), groups);
    });

    test('groups unchanged if there is only 1 line to hide', () => {
      assert.deepEqual(hideInContextControl(groups, 3, 4), groups);
    });
  });

  suite('isTotal', () => {
    test('is total for add', () => {
      const lines = [];
      for (let idx = 0; idx < 10; idx++) {
        lines.push(new GrDiffLine(GrDiffLineType.ADD));
      }
      const group = new GrDiffGroup({type: GrDiffGroupType.DELTA, lines});
      assert.isTrue(group.isTotal());
    });

    test('is total for remove', () => {
      const lines = [];
      for (let idx = 0; idx < 10; idx++) {
        lines.push(new GrDiffLine(GrDiffLineType.REMOVE));
      }
      const group = new GrDiffGroup({type: GrDiffGroupType.DELTA, lines});
      assert.isTrue(group.isTotal());
    });

    test('not total for non-delta', () => {
      const lines = [];
      for (let idx = 0; idx < 10; idx++) {
        lines.push(new GrDiffLine(GrDiffLineType.BOTH));
      }
      const group = new GrDiffGroup({type: GrDiffGroupType.DELTA, lines});
      assert.isFalse(group.isTotal());
    });
  });
});