Implement bidirectional customer conversations with customer-based grouping and order tagging

LittleShop/Areas/Admin/Controllers/MessagesController.cs

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+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using LittleShop.DTOs;
+using LittleShop.Services;
+using LittleShop.Models;
+
+namespace LittleShop.Areas.Admin.Controllers;
+
+[Area("Admin")]
+[Authorize(Policy = "AdminOnly")]
+public class MessagesController : Controller
+{
+    private readonly ICustomerMessageService _messageService;
+    private readonly ILogger<MessagesController> _logger;
+
+    public MessagesController(ICustomerMessageService messageService, ILogger<MessagesController> logger)
+    {
+        _messageService = messageService;
+        _logger = logger;
+    }
+
+    public async Task<IActionResult> Index()
+    {
+        var threads = await _messageService.GetActiveThreadsAsync();
+        return View(threads);
+    }
+
+    public async Task<IActionResult> Customer(Guid id)
+    {
+        var conversation = await _messageService.GetMessageThreadAsync(id);
+        if (conversation == null)
+        {
+            return NotFound();
+        }
+
+        return View(conversation);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Reply(Guid customerId, string content, bool isUrgent = false)
+    {
+        try
+        {
+            var createMessageDto = new CreateCustomerMessageDto
+            {
+                CustomerId = customerId,
+                Type = MessageType.CustomerService,
+                Subject = "Support Reply", // Simple subject for admin replies
+                Content = content,
+                IsUrgent = isUrgent,
+                Priority = isUrgent ? 1 : 5
+            };
+
+            var message = await _messageService.CreateMessageAsync(createMessageDto);
+            if (message != null)
+            {
+                TempData["Success"] = "Reply sent successfully!";
+            }
+            else
+            {
+                TempData["Error"] = "Failed to send reply.";
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error sending reply");
+            TempData["Error"] = "An error occurred sending the reply.";
+        }
+
+        return RedirectToAction("Customer", new { id = customerId });
+    }
+}