// Copyright 2018 the Charts project authors. Please see the AUTHORS file
// for details.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:math';

import 'package:charts_common/src/chart/cartesian/axis/axis.dart';
import 'package:charts_common/src/chart/cartesian/cartesian_renderer.dart';
import 'package:charts_common/src/chart/common/chart_canvas.dart';
import 'package:charts_common/src/chart/common/datum_details.dart';
import 'package:charts_common/src/chart/common/processed_series.dart';
import 'package:charts_common/src/chart/common/series_datum.dart';
import 'package:charts_common/src/common/symbol_renderer.dart';

import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

/// For testing viewport start / end.
class FakeCartesianRenderer extends BaseCartesianRenderer {
  @override
  List<DatumDetails> getNearestDatumDetailPerSeries(Point<double> chartPoint,
          bool byDomain, Rectangle<int> boundsOverride) =>
      null;

  @override
  void paint(ChartCanvas canvas, double animationPercent) {}

  @override
  void update(List<ImmutableSeries> seriesList, bool isAnimating) {}

  @override
  SymbolRenderer get symbolRenderer => null;

  DatumDetails addPositionToDetailsForSeriesDatum(
      DatumDetails details, SeriesDatum seriesDatum) {
    return details;
  }
}

class MockAxis extends Mock implements Axis {}

void main() {
  BaseCartesianRenderer renderer;

  setUp(() {
    renderer = new FakeCartesianRenderer();
  });

  group('find viewport start', () {
    test('several domains are in the viewport', () {
      final data = [0, 1, 2, 3, 4, 5, 6];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(0);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);
      when(axis.compareDomainValueToViewport(4)).thenReturn(0);
      when(axis.compareDomainValueToViewport(5)).thenReturn(1);
      when(axis.compareDomainValueToViewport(6)).thenReturn(1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(2));
    });

    test('extents are all in the viewport, use the first domain', () {
      // Start of viewport is the same as the start of the domain.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(0);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(0));
    });

    test('is the first domain', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(0);
      when(axis.compareDomainValueToViewport(1)).thenReturn(1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(0));
    });

    test('is the last domain', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(3));
    });

    test('is the middle', () {
      final data = [0, 1, 2, 3, 4, 5, 6];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);
      when(axis.compareDomainValueToViewport(4)).thenReturn(1);
      when(axis.compareDomainValueToViewport(5)).thenReturn(1);
      when(axis.compareDomainValueToViewport(6)).thenReturn(1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(3));
    });

    test('viewport is between data', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(1));
    });

    // Error case, viewport shouldn't be set to the outside of the extents.
    // We still want to provide a value.
    test('all extents greater than viewport ', () {
      // Return the right most value as start of viewport.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(3));
    });

    // Error case, viewport shouldn't be set to the outside of the extents.
    // We still want to provide a value.
    test('all extents less than viewport ', () {
      // Return the left most value as the start of the viewport.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(-1);

      final start = renderer.findNearestViewportStart(axis, domainFn, data);

      expect(start, equals(0));
    });
  });

  group('find viewport end', () {
    test('several domains are in the viewport', () {
      final data = [0, 1, 2, 3, 4, 5, 6];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(0);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);
      when(axis.compareDomainValueToViewport(4)).thenReturn(0);
      when(axis.compareDomainValueToViewport(5)).thenReturn(1);
      when(axis.compareDomainValueToViewport(6)).thenReturn(1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(4));
    });

    test('extents are all in the viewport, use the last domain', () {
      // Start of viewport is the same as the end of the domain.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(0);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(3));
    });

    test('is the first domain', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(0);
      when(axis.compareDomainValueToViewport(1)).thenReturn(1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(0));
    });

    test('is the last domain', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(3));
    });

    test('is the middle', () {
      final data = [0, 1, 2, 3, 4, 5, 6];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(0);
      when(axis.compareDomainValueToViewport(4)).thenReturn(1);
      when(axis.compareDomainValueToViewport(5)).thenReturn(1);
      when(axis.compareDomainValueToViewport(6)).thenReturn(1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(3));
    });

    test('viewport is between data', () {
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(0)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(1)).thenReturn(-1);
      when(axis.compareDomainValueToViewport(2)).thenReturn(1);
      when(axis.compareDomainValueToViewport(3)).thenReturn(1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(2));
    });

    // Error case, viewport shouldn't be set to the outside of the extents.
    // We still want to provide a value.
    test('all extents greater than viewport ', () {
      // Return the right most value as start of viewport.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(3));
    });

    // Error case, viewport shouldn't be set to the outside of the extents.
    // We still want to provide a value.
    test('all extents less than viewport ', () {
      // Return the left most value as the start of the viewport.
      final data = [0, 1, 2, 3];
      final domainFn = (int index) => data[index];
      final axis = new MockAxis();
      when(axis.compareDomainValueToViewport(any)).thenReturn(-1);

      final start = renderer.findNearestViewportEnd(axis, domainFn, data);

      expect(start, equals(0));
    });
  });
}