Repository: jamesmh/coravel (csharp)

Issue:
Scheduler: Get Schedules Method
Right now the Scheduler class holds a collection of active scheduled jobs. We want to add a method that will return a data representation of all the currently active schedules.

We'll want to create a new method on the IScheduler interface (and on the Scheduler class). This method will return a new type that we need to create called `ScheduledData`. 

In the new method we create, it should iterated over all the scheduled events (like we are doing in other places) but don't consume the,m, just iterate over them and build up a new IReadOnlyList<ScheduledData>. Each ScheduledEvent class/item can expose a new method that returns a ScheduledData item. We should create a new interface to put on the ScheduledEvent class that will hold this method GetScheduledData.

Fields that ScheduledData class should hold include:

- The CRON expression for the schedule
- is scheduled per second
- second interval (not included in the CRON expression so we expose separately)
- invocableType
- prevent overlapping
- event unique id
- has any "when" predicates
-  zoned time zone
- run once at start?
- run once?

Pull request description:
This PR implements a new `GetSchedules()` method on the `IScheduler` interface that returns a data representation of all currently active schedules.

## Changes Made

### Core Implementation
- **`ScheduledData` class**: New data class containing all schedule information:
  - CRON expression
  - Per-second scheduling flag and interval
  - Invocable type
  - Overlapping prevention settings
  - Unique event identifier
  - When predicate existence
  - Time zone information
  - Run-once configurations

- **`IScheduledDataProvider` interface**: New interface implemented by `ScheduledEvent` to provide schedule data

- **`GetScheduledData()` method**: Added to `ScheduledEvent` class to extract schedule information

- **`GetSchedules()` method**: Added to `IScheduler` interface and implemented in `Scheduler` class to return `IReadOnlyList<ScheduledData>`

### Supporting Changes
- **`ToString()` method**: Added to `CronExpression` class to get string representation
- **`TimeZoneInfo` property**: Added to `ZonedTime` class to expose timezone information

### Usage Example
```csharp
// Create and configure schedules
scheduler.Schedule<MyTask>().Daily().PreventOverlapping("daily-task");
scheduler.Schedule(() => DoWork()).EverySeconds(30);

// Get all active schedules
var schedules = scheduler.GetSchedules();
foreach (var schedule in schedules)
{
    Console.WriteLine($"Schedule: {schedule.CronExpression}");
    Console.WriteLine($"Type: {schedule.InvocableType?.Name ?? "Action"}");
    Console.WriteLine($"Prevents Overlapping: {schedule.PreventOverlapping}");
}
```

## Tests
Added comprehensive unit tests covering:
- Empty schedules collection
- Basic action schedules  
- Invocable type schedules
- Per-second schedules
- Async schedules
- Schedules with all configuration options
- Multiple schedules scenarios
- CRON expression schedules
- Zoned schedules

All existing tests continue to pass (1008 total tests).

Fixes #442.

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Patch:
diff --git a/Src/Coravel/Scheduling/Schedule/Cron/CronExpression.cs b/Src/Coravel/Scheduling/Schedule/Cron/CronExpression.cs
index e711a5aa..e4ce3a9c 100644
--- a/Src/Coravel/Scheduling/Schedule/Cron/CronExpression.cs
+++ b/Src/Coravel/Scheduling/Schedule/Cron/CronExpression.cs
@@ -77,6 +77,11 @@ private bool IsMonthDue(DateTime time)
             return new CronExpressionPart(this._months, 12).IsDue(time.Month);
         }
 
+        public override string ToString()
+        {
+            return $"{_minutes} {_hours} {_days} {_months} {_weekdays}";
+        }
+
         private void GuardExpressionIsValid()
         {
             // We don't want to check that the expression is due, but just run validation and ignore any results.
diff --git a/Src/Coravel/Scheduling/Schedule/Event/ScheduledEvent.cs b/Src/Coravel/Scheduling/Schedule/Event/ScheduledEvent.cs
index 11f2f392..056ff210 100644
--- a/Src/Coravel/Scheduling/Schedule/Event/ScheduledEvent.cs
+++ b/Src/Coravel/Scheduling/Schedule/Event/ScheduledEvent.cs
@@ -10,7 +10,7 @@
 
 namespace Coravel.Scheduling.Schedule.Event
 {
-    public class ScheduledEvent : IScheduleInterval, IScheduledEventConfiguration
+    public class ScheduledEvent : IScheduleInterval, IScheduledEventConfiguration, IGetAllScheduleInfo
     {
         private CronExpression _expression;
         private ActionOrAsyncFunc _scheduledAction;
@@ -130,6 +130,22 @@ public async Task InvokeScheduledEvent(CancellationToken cancellationToken)
 
         public bool IsScheduledCronBasedTask() => !this._isScheduledPerSecond;
 
+        public ScheduleInfo GetScheduleInfo()
+        {
+            return new ScheduleInfo(
+                cronExpression: this._expression?.ToString() ?? string.Empty,
+                isScheduledPerSecond: this._isScheduledPerSecond,
+                secondsInterval: this._secondsInterval,
+                invocableType: this._invocableType,
+                preventOverlapping: this._preventOverlapping,
+                eventUniqueId: this._eventUniqueId,
+                hasWhenPredicates: this._whenPredicate != null,
+                zonedTimeZone: this._zonedTime?.TimeZoneInfo ?? TimeZoneInfo.Utc,
+                runOnceAtStart: this._runOnceAtStart,
+                runOnce: this._runOnce
+            );
+        }
+
         public IScheduledEventConfiguration Daily()
         {
             this._expression = new CronExpression("00 00 * * *");
diff --git a/Src/Coravel/Scheduling/Schedule/Interfaces/IGetAllScheduleInfo.cs b/Src/Coravel/Scheduling/Schedule/Interfaces/IGetAllScheduleInfo.cs
new file mode 100644
index 00000000..13191e68
--- /dev/null
+++ b/Src/Coravel/Scheduling/Schedule/Interfaces/IGetAllScheduleInfo.cs
@@ -0,0 +1,14 @@
+namespace Coravel.Scheduling.Schedule.Interfaces
+{
+    /// <summary>
+    /// Provides methods to get information about active schedules.
+    /// </summary>
+    public interface IGetAllScheduleInfo
+    {
+        /// <summary>
+        /// Gets a data representation of the scheduled event.
+        /// </summary>
+        /// <returns>A ScheduleInfo object containing the schedule information.</returns>
+        ScheduleInfo GetScheduleInfo();
+    }
+}
\ No newline at end of file
diff --git a/Src/Coravel/Scheduling/Schedule/Interfaces/IScheduler.cs b/Src/Coravel/Scheduling/Schedule/Interfaces/IScheduler.cs
index 722212b8..8dda11e4 100644
--- a/Src/Coravel/Scheduling/Schedule/Interfaces/IScheduler.cs
+++ b/Src/Coravel/Scheduling/Schedule/Interfaces/IScheduler.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using Coravel.Invocable;
 
@@ -63,5 +64,11 @@ public interface IScheduler
         /// <param name="workerName"></param>
         /// <returns></returns>
         IScheduler OnWorker(string workerName);
+
+        /// <summary>
+        /// Gets a data representation of all currently active schedules.
+        /// </summary>
+        /// <returns>A read-only list of ScheduleInfo objects containing information about all active schedules.</returns>
+        IReadOnlyList<ScheduleInfo> GetSchedules();
     }
 }
diff --git a/Src/Coravel/Scheduling/Schedule/ScheduleInfo.cs b/Src/Coravel/Scheduling/Schedule/ScheduleInfo.cs
new file mode 100644
index 00000000..128b3df1
--- /dev/null
+++ b/Src/Coravel/Scheduling/Schedule/ScheduleInfo.cs
@@ -0,0 +1,84 @@
+using System;
+
+namespace Coravel.Scheduling.Schedule
+{
+    /// <summary>
+    /// Data representation of a scheduled event.
+    /// </summary>
+    public class ScheduleInfo
+    {
+        /// <summary>
+        /// The CRON expression for the schedule.
+        /// </summary>
+        public string CronExpression { get; }
+
+        /// <summary>
+        /// Indicates if the schedule is scheduled per second.
+        /// </summary>
+        public bool IsScheduledPerSecond { get; }
+
+        /// <summary>
+        /// The second interval (not included in the CRON expression so exposed separately).
+        /// </summary>
+        public int? SecondsInterval { get; }
+
+        /// <summary>
+        /// The type of the invocable.
+        /// </summary>
+        public Type InvocableType { get; }
+
+        /// <summary>
+        /// Indicates if overlapping should be prevented.
+        /// </summary>
+        public bool PreventOverlapping { get; }
+
+        /// <summary>
+        /// The unique identifier for the event.
+        /// </summary>
+        public string EventUniqueId { get; }
+
+        /// <summary>
+        /// Indicates if the schedule has any "when" predicates.
+        /// </summary>
+        public bool HasWhenPredicates { get; }
+
+        /// <summary>
+        /// The time zone information for the schedule.
+        /// </summary>
+        public TimeZoneInfo ZonedTimeZone { get; }
+
+        /// <summary>
+        /// Indicates if the schedule should run once at start.
+        /// </summary>
+        public bool RunOnceAtStart { get; }
+
+        /// <summary>
+        /// Indicates if the schedule should run only once.
+        /// </summary>
+        public bool RunOnce { get; }
+
+        public ScheduleInfo(
+            string cronExpression,
+            bool isScheduledPerSecond,
+            int? secondsInterval,
+            Type invocableType,
+            bool preventOverlapping,
+            string eventUniqueId,
+            bool hasWhenPredicates,
+            TimeZoneInfo zonedTimeZone,
+            bool runOnceAtStart,
+            bool runOnce)
+        {
+            CronExpression = cronExpression;
+            IsScheduledPerSecond = isScheduledPerSecond;
+            SecondsInterval = secondsInterval;
+            InvocableType = invocableType;
+            PreventOverlapping = preventOverlapping;
+            EventUniqueId = eventUniqueId;
+            HasWhenPredicates = hasWhenPredicates;
+            ZonedTimeZone = zonedTimeZone;
+            RunOnceAtStart = runOnceAtStart;
+            RunOnce = runOnce;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Src/Coravel/Scheduling/Schedule/Scheduler.cs b/Src/Coravel/Scheduling/Schedule/Scheduler.cs
index 1100bc8a..ffe0e5d1 100644
--- a/Src/Coravel/Scheduling/Schedule/Scheduler.cs
+++ b/Src/Coravel/Scheduling/Schedule/Scheduler.cs
@@ -149,6 +149,15 @@ public bool TryUnschedule(string uniqueIdentifier)
             return true; // Nothing to remove - was successful.
         }
 
+        public IReadOnlyList<ScheduleInfo> GetSchedules()
+        {
+            return this._tasks.Values
+                .Select(task => task.ScheduledEvent)
+                .OfType<IGetAllScheduleInfo>()
+                .Select(dataProvider => dataProvider.GetScheduleInfo())
+                .ToList();
+        }
+
         private async Task InvokeEventWithLoggerScope(ScheduledEvent scheduledEvent)
         {         
             using var scope = this._scopeFactory.CreateAsyncScope();
diff --git a/Src/Coravel/Scheduling/Schedule/Zoned/ZonedTime.cs b/Src/Coravel/Scheduling/Schedule/Zoned/ZonedTime.cs
index 8e3901b1..8ee84e83 100644
--- a/Src/Coravel/Scheduling/Schedule/Zoned/ZonedTime.cs
+++ b/Src/Coravel/Scheduling/Schedule/Zoned/ZonedTime.cs
@@ -5,6 +5,9 @@ namespace Coravel.Scheduling.Schedule.Zoned
     public class ZonedTime
     {
         private TimeZoneInfo _info;
+        
+        public TimeZoneInfo TimeZoneInfo => _info;
+        
         public ZonedTime(TimeZoneInfo info)
         {
             this._info = info;


Test patch:
diff --git a/Src/UnitTests/CoravelUnitTests/Scheduling/SchedulerGetSchedulesTests.cs b/Src/UnitTests/CoravelUnitTests/Scheduling/SchedulerGetSchedulesTests.cs
new file mode 100644
index 00000000..f14f0d9c
--- /dev/null
+++ b/Src/UnitTests/CoravelUnitTests/Scheduling/SchedulerGetSchedulesTests.cs
@@ -0,0 +1,204 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Coravel.Invocable;
+using Coravel.Scheduling.Schedule;
+using Coravel.Scheduling.Schedule.Mutex;
+using CoravelUnitTests.Scheduling.Stubs;
+using Xunit;
+
+namespace CoravelUnitTests.Scheduling
+{
+    public class SchedulerGetSchedulesTests
+    {
+        public class TestInvocable : IInvocable
+        {
+            public Task Invoke()
+            {
+                return Task.CompletedTask;
+            }
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsEmptyList_WhenNoSchedulesExist()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Empty(schedules);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForBasicSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule(() => { }).Daily();
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("00 00 * * *", schedule.CronExpression);
+            Assert.False(schedule.IsScheduledPerSecond);
+            Assert.Null(schedule.SecondsInterval);
+            Assert.Null(schedule.InvocableType);
+            Assert.False(schedule.PreventOverlapping);
+            Assert.NotNull(schedule.EventUniqueId);
+            Assert.False(schedule.HasWhenPredicates);
+            Assert.Equal(TimeZoneInfo.Utc, schedule.ZonedTimeZone);
+            Assert.False(schedule.RunOnceAtStart);
+            Assert.False(schedule.RunOnce);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForInvocableSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule<TestInvocable>().Hourly();
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("00 * * * *", schedule.CronExpression);
+            Assert.False(schedule.IsScheduledPerSecond);
+            Assert.Null(schedule.SecondsInterval);
+            Assert.Equal(typeof(TestInvocable), schedule.InvocableType);
+            Assert.False(schedule.PreventOverlapping);
+            Assert.NotNull(schedule.EventUniqueId);
+            Assert.False(schedule.HasWhenPredicates);
+            Assert.Equal(TimeZoneInfo.Utc, schedule.ZonedTimeZone);
+            Assert.False(schedule.RunOnceAtStart);
+            Assert.False(schedule.RunOnce);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForEverySecondsSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule(() => { }).EverySeconds(5);
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("* * * * *", schedule.CronExpression);
+            Assert.True(schedule.IsScheduledPerSecond);
+            Assert.Equal(5, schedule.SecondsInterval);
+            Assert.Null(schedule.InvocableType);
+            Assert.False(schedule.PreventOverlapping);
+            Assert.NotNull(schedule.EventUniqueId);
+            Assert.False(schedule.HasWhenPredicates);
+            Assert.Equal(TimeZoneInfo.Utc, schedule.ZonedTimeZone);
+            Assert.False(schedule.RunOnceAtStart);
+            Assert.False(schedule.RunOnce);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForScheduleWithConfigurations()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule(() => { })
+                .Daily()
+                .PreventOverlapping("test-unique-id")
+                .When(() => Task.FromResult(true))
+                .RunOnceAtStart()
+                .Once();
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("00 00 * * *", schedule.CronExpression);
+            Assert.False(schedule.IsScheduledPerSecond);
+            Assert.Null(schedule.SecondsInterval);
+            Assert.Null(schedule.InvocableType);
+            Assert.True(schedule.PreventOverlapping);
+            Assert.Equal("test-unique-id", schedule.EventUniqueId);
+            Assert.True(schedule.HasWhenPredicates);
+            Assert.Equal(TimeZoneInfo.Utc, schedule.ZonedTimeZone);
+            Assert.True(schedule.RunOnceAtStart);
+            Assert.True(schedule.RunOnce);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForZonedSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            var easternTz = TimeZoneInfo.CreateCustomTimeZone("EST", TimeSpan.FromHours(-5), "Eastern Standard Time", "EST");
+            
+            scheduler.Schedule(() => { })
+                .Daily()
+                .Zoned(easternTz);
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal(easternTz, schedule.ZonedTimeZone);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForCronSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule(() => { }).Cron("15 8 * * 1");
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("15 8 * * 1", schedule.CronExpression);
+            Assert.False(schedule.IsScheduledPerSecond);
+            Assert.Null(schedule.SecondsInterval);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsMultipleSchedules_WhenMultipleSchedulesExist()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.Schedule(() => { }).Daily();
+            scheduler.Schedule<TestInvocable>().Hourly();
+            scheduler.Schedule(() => { }).EverySeconds(10);
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Equal(3, schedules.Count);
+            
+            // Verify we have one daily, one hourly, and one every seconds schedule
+            Assert.Contains(schedules, s => s.CronExpression == "00 00 * * *");
+            Assert.Contains(schedules, s => s.CronExpression == "00 * * * *");
+            Assert.Contains(schedules, s => s.IsScheduledPerSecond && s.SecondsInterval == 10);
+        }
+
+        [Fact]
+        public void GetSchedules_ReturnsCorrectData_ForAsyncSchedule()
+        {
+            var scheduler = new Scheduler(new InMemoryMutex(), new ServiceScopeFactoryStub(), new DispatcherStub());
+            
+            scheduler.ScheduleAsync(async () => await Task.Delay(1)).Daily();
+
+            var schedules = scheduler.GetSchedules();
+
+            Assert.Single(schedules);
+            var schedule = schedules.First();
+            Assert.Equal("00 00 * * *", schedule.CronExpression);
+            Assert.False(schedule.IsScheduledPerSecond);
+            Assert.Null(schedule.SecondsInterval);
+            Assert.Null(schedule.InvocableType);
+            Assert.False(schedule.PreventOverlapping);
+            Assert.NotNull(schedule.EventUniqueId);
+            Assert.False(schedule.HasWhenPredicates);
+            Assert.Equal(TimeZoneInfo.Utc, schedule.ZonedTimeZone);
+            Assert.False(schedule.RunOnceAtStart);
+            Assert.False(schedule.RunOnce);
+        }
+    }
+}
\ No newline at end of file