/*
<copyright>
  Codefarts.UnityTesting spawned from SharpUnit
  contact@codefarts.com
  http://www.codefarts.com

  SharpUnit was written by:
  Mark Gants | mark@markgants.com
  May 20, 2010

  This software is provided "as is" for free.
  You may do anything you like with this software as long as you leave this notice in place.

  See original LICENCE file for full license details.
</copyright>
*/

namespace Codefarts.GeneralTools.Windows
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;

    using Codefarts.UnitTesting;
    using Codefarts.UnitTesting.Editor;
    using Codefarts.UnitTesting.Unity;

    using UnityEngine;
    using UnityEditor;

    using Vector2 = UnityEngine.Vector2;

    public class UnitTestingWindow : EditorWindow
    {
        /// <summary>
        /// Provides a key type for the list of tests shown in the test window. 
        /// </summary>
        public class KeyType
        {
            /// <summary>
            /// Gets or sets whether or not the key is shown expanded.
            /// </summary>
            public bool Expanded { get; set; }

            /// <summary>
            /// Gets or sets the name of the test class containing the test methods.
            /// </summary>
            public string Name { get; set; }
        }

        /// <summary>
        /// Used to draw the test results in a table format.
        /// </summary>
        private readonly Table<TestResult> grid;

        /// <summary>
        /// Used to draw the test names for the tests.
        /// </summary>
        private Dictionary<KeyType, List<TestModel>> testModels;

        /// <summary>
        /// Holds the scroll value for the results table.
        /// </summary>
        private Vector2 resultsScrollPosition;

        /// <summary>
        /// Holds the scroll value for the test names.
        /// </summary>
        private Vector2 testsScrollPosition;

        /// <summary>
        /// Default Constructor.
        /// </summary>
        public UnitTestingWindow()
        {
            this.grid = new Table<TestResult>(Localization.LocalizationManager.Instance.Get("Results")) { AlwaysDraw = true };
        }

        /// <summary>
        /// Called by unity to draw the ui.
        /// </summary>
        public void OnGUI()
        {
            var local = Localization.LocalizationManager.Instance;
            GUILayout.BeginVertical();    // top level

            GUILayout.BeginHorizontal();  // tool bar

            // draw output to console check box
            this.ConsoleOutput = GUILayout.Toggle(this.ConsoleOutput, local.Get("Console"));

            GUILayout.FlexibleSpace();
            if (GUILayout.Button(local.Get("RunTests")))
            {
                // get test methods to run
                var items = from t in this.testModels
                            from x in t.Value
                            where (bool)x.Tag
                            select x;
                var results = Helpers.RunTests(this.ConsoleOutput, items);
                this.grid.Model = new UnitTestResultModel(results);
            }

            GUILayout.EndHorizontal();     // tool bar

            GUILayout.BeginHorizontal();   // panels

            this.DrawTestNameList();
            this.DrawResultsTable();

            GUILayout.EndHorizontal();  // panels

            GUILayout.EndVertical();   // top level
        }

        /// <summary>
        /// Gets or sets a value indicating whether or not the results from the tests will be reported out to the unity console window.
        /// </summary>
        public bool ConsoleOutput { get; set; }

        /// <summary>
        /// Draws the results table.
        /// </summary>
        private void DrawResultsTable()
        {
            this.resultsScrollPosition = GUILayout.BeginScrollView(this.resultsScrollPosition, GUILayout.ExpandWidth(true), GUILayout.ExpandHeight(true));
            this.grid.Draw();
            GUILayout.FlexibleSpace();
            GUILayout.EndScrollView();
        }

        /// <summary>
        /// Draws the list of test names.
        /// </summary>
        private void DrawTestNameList()
        {
            GUILayout.BeginVertical(GUILayout.MaxWidth(300));

            var local = Localization.LocalizationManager.Instance;

            // setup callback for setting check box values
            var setValues = new Action<bool>(value =>
                {
                    foreach (var model in this.testModels)
                    {
                        foreach (var item in model.Value)
                        {
                            item.Tag = value;
                        }
                    }
                });

            GUILayout.BeginHorizontal(); // all none buttons


            if (GUILayout.Button(local.Get("Expand")))
            {
                foreach (var item in this.testModels)
                {
                    item.Key.Expanded = true;
                }
            }

            if (GUILayout.Button(local.Get("Collapse")))
            {
                foreach (var item in this.testModels)
                {
                    item.Key.Expanded = false;
                }
            }

            GUILayout.FlexibleSpace();

            if (GUILayout.Button(local.Get("All")))
            {
                setValues(true);
            }

            if (GUILayout.Button(local.Get("None")))
            {
                setValues(false);
            }

            GUILayout.EndHorizontal(); // all none buttons

            this.testsScrollPosition = GUILayout.BeginScrollView(this.testsScrollPosition, GUILayout.ExpandWidth(false), GUILayout.ExpandHeight(true));

            foreach (var item in this.testModels)
            {
                var category = Path.GetExtension(item.Key.Name);
                category = category != null && category.StartsWith(".") ? category.Substring(1) : category;

                GUILayout.BeginHorizontal();
                var all = item.Value.All(x => (bool)x.Tag);
                var result = GUILayout.Toggle(all, string.Empty, GUILayout.ExpandWidth(false));

                // draw test class
                item.Key.Expanded = EditorGUILayout.Foldout(item.Key.Expanded, category);
                GUILayout.EndHorizontal();
                if (all != result)
                {
                    foreach (var model in item.Value)
                    {
                        model.Tag = result;
                    }
                }

                if (!item.Key.Expanded)
                {
                    // if not expanded then skip to next test class
                    continue;
                }

                GUILayout.BeginHorizontal();
                GUILayout.Space(16);
                GUILayout.BeginVertical();
                // draw test methods
                foreach (var value in item.Value)
                {
                    value.Tag = GUILayout.Toggle((bool)value.Tag, value.MethodName.Replace("_", " "), GUILayout.ExpandWidth(false));
                }

                GUILayout.EndVertical();
                GUILayout.EndHorizontal();
            }

            GUILayout.FlexibleSpace();
            GUILayout.EndScrollView();
            GUILayout.EndVertical();
        }

        /// <summary>
        /// Called by unity when the window is enabled.
        /// </summary>
        public void OnEnable()
        {
            this.testModels = Helpers.GetTestModels()
                .GroupBy(o => o.Reference.GetType().FullName)
                .ToDictionary(g => new KeyType() { Name = g.Key, Expanded = true }, g => g.Select(x =>
                {
                    x.Tag = false;
                    return x;
                }).ToList());
        }

        /// <summary>
        /// Used to initialize the window.
        /// </summary>
        [MenuItem("Window/Codefarts/Unit Testing")]
        public static void ShowWindow()
        {
            // get the window, show it, and hand it focus
            var window = GetWindow<UnitTestingWindow>(Localization.LocalizationManager.Instance.Get("UnitTesting"));
            window.Show();
            window.Focus();
            window.Repaint();
        }
    }
}