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using System;
using System.Collections.Generic;
using NUnit.Framework;
using XenAdmin.Wlb;

namespace XenAdminTests.UnitTests.WlbTests
{
    [TestFixture, Category(TestCategories.Unit)]
    public class WlbScheduledTasksTests
    {
        [Test]
        public void MethodCallsFromAnEmptyConstructor()
        {
            WlbScheduledTasks tasks = new WlbScheduledTasks();
            Assert.AreEqual(0, tasks.TaskList.Count, "TaskList");
            Assert.AreEqual(0, tasks.SortedTaskList.Count, "SortedTaskList");
            Assert.AreEqual(0, tasks.VirtualTaskList.Count, "VirtualTaskList");
            Assert.IsNull(tasks.ToDictionary(), "Conversion to dictionary");
            Assert.IsNull(tasks.GetNextExecutingTask(), "GetNextExecutingTask");
        }

        [Test]
        public void EmptyConstructorCausesCurrentScheduledPerformanceModeToThrow()
        {
            var tasks = new WlbScheduledTasks();
            Assert.Throws(typeof(IndexOutOfRangeException), () => tasks.GetCurrentScheduledPerformanceMode());
        }

        [Test]
        public void EmptyConstructorCausesLastTaskToThrow()
        {
            var tasks = new WlbScheduledTasks();
            Assert.Throws(typeof(IndexOutOfRangeException), () => tasks.GetLastExecutingTask());
        }

        [Test]
        public void MethodCallsFromADictionaryConstructedObject()
        {
            var tasks = new WlbScheduledTasks(new Dictionary<string, string>
            {
                {"schedTask_dosomething", "now"},
                {"schedTask_3", "later"},
                {"schedTask_1", "sooner"},
                {"domoresomethings", "will not be added"}
            });

            //Task List Construction
            Assert.AreEqual(3, tasks.TaskList.Count );
            Assert.AreEqual(0, tasks.TaskList["dosomething"].TaskId);
            Assert.AreEqual(1, tasks.TaskList["1"].TaskId);
            Assert.AreEqual(3, tasks.TaskList["3"].TaskId);

            //Dictionary Conversion
            Assert.AreEqual(3, tasks.ToDictionary().Count, "Conversion to dictionary");

            //Sorted Tasks
            SortedDictionary<int, WlbScheduledTask> sortedTasks = tasks.SortedTaskList;
            Assert.AreEqual(3, sortedTasks.Count, "SortedTaskList");
            List<WlbScheduledTask> tasksValues = new List<WlbScheduledTask>(sortedTasks.Values);
            Assert.AreEqual(0, tasksValues[0].TaskId);
            Assert.AreEqual(3, tasksValues[1].TaskId);
            Assert.AreEqual(1, tasksValues[2].TaskId);

            //Virtual Tasks
            Assert.AreEqual(0, tasks.VirtualTaskList.Count, "VirtualTaskList");
            
            //Next task
            WlbScheduledTask nextTask = tasks.GetNextExecutingTask();
            Assert.IsNull( nextTask, "GetNextExecutingTask");
        }

        [Test]
        public void VirtualTaskListWithAddedTasks()
        {
            WlbScheduledTasks tasks = BuildSampleTasksWithTimes();
            SortedDictionary<int, WlbScheduledTask> virtualTasks = tasks.VirtualTaskList;
            Assert.AreEqual(3, tasks.TaskList.Count);
            Assert.AreEqual(3, tasks.SortedTaskList.Count);
            Assert.AreEqual(4, virtualTasks.Count);

            //Verify sort keys from the virtual list and their task id
            List<WlbScheduledTask> virtualTasksValues = new List<WlbScheduledTask>(virtualTasks.Values);
            Assert.AreEqual(3, virtualTasksValues[0].TaskId);
            Assert.AreEqual(2, virtualTasksValues[1].TaskId);
            Assert.AreEqual(1, virtualTasksValues[2].TaskId);
            Assert.AreEqual(3, virtualTasksValues[3].TaskId);

            //Next Task
            Assert.IsNull(tasks.GetNextExecutingTask());

            //Last Task
            Assert.IsNotNull(tasks.GetLastExecutingTask());

            //Check performance mode fetch from last task
            Assert.AreEqual(WlbPoolPerformanceMode.MaximizeDensity, tasks.GetCurrentScheduledPerformanceMode());
        }

        private WlbScheduledTasks BuildSampleTasksWithTimes()
        {
            WlbScheduledTasks tasks = new WlbScheduledTasks();

            var taskParameters = new Dictionary<string, string>()
            {
                {"OptMode", "1"} // Performance mode
            };

            var taskA = new WlbScheduledTask("1")
            {
                DaysOfWeek = WlbScheduledTask.WlbTaskDaysOfWeek.Friday,
                TaskParameters = taskParameters
            };

            var taskB = new WlbScheduledTask("2")
            {
                DaysOfWeek = WlbScheduledTask.WlbTaskDaysOfWeek.Monday,
                TaskParameters = taskParameters
            };

            //Weekend tasks adds 2 to the virtual task list, one for each day
            var taskC = new WlbScheduledTask("3")
            {
                DaysOfWeek = WlbScheduledTask.WlbTaskDaysOfWeek.Weekends,
                TaskParameters = taskParameters
            };

            var taskCollection = new Dictionary<string, WlbScheduledTask>()
            {
                {"schedTask_1", taskA},
                {"schedTask_2", taskB},
                {"schedTask_3", taskC}
            };

            Assert.AreEqual(3, taskCollection.Count, "Setting up task collection");
            tasks.TaskList = taskCollection;
            return tasks;
        }
    }
}