using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using LittleShop.Services;
using LittleShop.DTOs;

namespace LittleShop.Areas.Admin.Controllers;

[Area("Admin")]
[Authorize(Policy = "AdminOnly")]
public class OrdersController : Controller
{
    private readonly IOrderService _orderService;

    public OrdersController(IOrderService orderService)
    {
        _orderService = orderService;
    }

    public async Task<IActionResult> Index(string tab = "accept")
    {
        ViewData["CurrentTab"] = tab;

        switch (tab.ToLower())
        {
            case "pending":
                ViewData["Orders"] = await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.PendingPayment);
                ViewData["TabTitle"] = "Pending Payment";
                break;
            case "accept":
                ViewData["Orders"] = await _orderService.GetOrdersRequiringActionAsync();
                ViewData["TabTitle"] = "Orders to Accept";
                break;
            case "packing":
                ViewData["Orders"] = await _orderService.GetOrdersForPackingAsync();
                ViewData["TabTitle"] = "Orders for Packing";
                break;
            case "dispatched":
                ViewData["Orders"] = await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.Dispatched);
                ViewData["TabTitle"] = "Dispatched Orders";
                break;
            case "delivered":
                ViewData["Orders"] = await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.Delivered);
                ViewData["TabTitle"] = "Delivered Orders";
                break;
            case "onhold":
                ViewData["Orders"] = await _orderService.GetOrdersOnHoldAsync();
                ViewData["TabTitle"] = "Orders On Hold";
                break;
            case "cancelled":
                ViewData["Orders"] = await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.Cancelled);
                ViewData["TabTitle"] = "Cancelled Orders";
                break;
            default:
                ViewData["Orders"] = await _orderService.GetAllOrdersAsync();
                ViewData["TabTitle"] = "All Orders";
                break;
        }

        // Get workflow counts for tab badges
        ViewData["PendingCount"] = (await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.PendingPayment)).Count();
        ViewData["AcceptCount"] = (await _orderService.GetOrdersRequiringActionAsync()).Count();
        ViewData["PackingCount"] = (await _orderService.GetOrdersForPackingAsync()).Count();
        ViewData["DispatchedCount"] = (await _orderService.GetOrdersByStatusAsync(LittleShop.Enums.OrderStatus.Dispatched)).Count();
        ViewData["OnHoldCount"] = (await _orderService.GetOrdersOnHoldAsync()).Count();

        return View();
    }

    public async Task<IActionResult> Details(Guid id)
    {
        var order = await _orderService.GetOrderByIdAsync(id);
        if (order == null)
        {
            return NotFound();
        }

        return View(order);
    }

    public IActionResult Create()
    {
        return View(new CreateOrderDto());
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Create(CreateOrderDto model)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }

        var order = await _orderService.CreateOrderAsync(model);
        return RedirectToAction(nameof(Details), new { id = order.Id });
    }

    public async Task<IActionResult> Edit(Guid id)
    {
        var order = await _orderService.GetOrderByIdAsync(id);
        if (order == null)
        {
            return NotFound();
        }

        return View(order);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(Guid id, OrderDto model)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }

        var updateDto = new UpdateOrderStatusDto
        {
            Status = model.Status,
            TrackingNumber = model.TrackingNumber,
            Notes = model.Notes
        };

        var success = await _orderService.UpdateOrderStatusAsync(id, updateDto);
        if (!success)
        {
            return NotFound();
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> UpdateStatus(Guid id, UpdateOrderStatusDto model)
    {
        var success = await _orderService.UpdateOrderStatusAsync(id, model);
        if (!success)
        {
            return NotFound();
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    // Workflow action methods
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> AcceptOrder(Guid id, string? notes)
    {
        var userName = User.Identity?.Name ?? "Unknown";
        var acceptDto = new AcceptOrderDto { Notes = notes };
        var success = await _orderService.AcceptOrderAsync(id, userName, acceptDto);

        if (!success)
        {
            TempData["Error"] = "Could not accept order. Check order status.";
        }
        else
        {
            TempData["Success"] = "Order accepted successfully.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> StartPacking(Guid id, string? notes)
    {
        var userName = User.Identity?.Name ?? "Unknown";
        var packingDto = new StartPackingDto { Notes = notes };
        var success = await _orderService.StartPackingAsync(id, userName, packingDto);

        if (!success)
        {
            TempData["Error"] = "Could not start packing. Check order status.";
        }
        else
        {
            TempData["Success"] = "Packing started successfully.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> DispatchOrder(Guid id, string trackingNumber, int estimatedDays = 3, string? notes = null)
    {
        var userName = User.Identity?.Name ?? "Unknown";
        var dispatchDto = new DispatchOrderDto
        {
            TrackingNumber = trackingNumber,
            EstimatedDeliveryDays = estimatedDays,
            Notes = notes
        };
        var success = await _orderService.DispatchOrderAsync(id, userName, dispatchDto);

        if (!success)
        {
            TempData["Error"] = "Could not dispatch order. Check order status.";
        }
        else
        {
            TempData["Success"] = $"Order dispatched with tracking {trackingNumber}.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> PutOnHold(Guid id, string reason, string? notes)
    {
        var userName = User.Identity?.Name ?? "Unknown";
        var holdDto = new PutOnHoldDto { Reason = reason, Notes = notes };
        var success = await _orderService.PutOnHoldAsync(id, userName, holdDto);

        if (!success)
        {
            TempData["Error"] = "Could not put order on hold.";
        }
        else
        {
            TempData["Success"] = "Order put on hold.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> RemoveFromHold(Guid id)
    {
        var userName = User.Identity?.Name ?? "Unknown";
        var success = await _orderService.RemoveFromHoldAsync(id, userName);

        if (!success)
        {
            TempData["Error"] = "Could not remove order from hold.";
        }
        else
        {
            TempData["Success"] = "Order removed from hold and returned to workflow.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> MarkDelivered(Guid id, DateTime? actualDeliveryDate, string? notes)
    {
        var deliveredDto = new MarkDeliveredDto
        {
            ActualDeliveryDate = actualDeliveryDate,
            Notes = notes
        };
        var success = await _orderService.MarkDeliveredAsync(id, deliveredDto);

        if (!success)
        {
            TempData["Error"] = "Could not mark order as delivered.";
        }
        else
        {
            TempData["Success"] = "Order marked as delivered.";
        }

        return RedirectToAction(nameof(Details), new { id });
    }
}