// src/Webshop.Api/Controllers/Admin/AdminOrdersController.cs
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Webshop.Application;
using Webshop.Application.DTOs.Orders;
using Webshop.Application.Services.Admin;
using Webshop.Domain.Enums;

namespace Webshop.Api.Controllers.Admin
{
    [ApiController]
    [Route("api/v1/admin/[controller]")]
    [Authorize(Roles = "Admin")]
    public class AdminOrdersController : ControllerBase
    {
        private readonly IAdminOrderService _adminOrderService;

        public AdminOrdersController(IAdminOrderService adminOrderService)
        {
            _adminOrderService = adminOrderService;
        }

        [HttpGet]
        [ProducesResponseType(typeof(IEnumerable<OrderSummaryDto>), StatusCodes.Status200OK)]
        public async Task<IActionResult> GetAllOrders()
        {
            var result = await _adminOrderService.GetAllOrdersAsync();
            return Ok(result.Value);
        }

        [HttpGet("{id}")]
        [ProducesResponseType(typeof(OrderDetailDto), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> GetOrderById(Guid id)
        {
            var result = await _adminOrderService.GetOrderByIdAsync(id);

            return result.Type switch
            {
                ServiceResultType.Success => Ok(result.Value),
                ServiceResultType.NotFound => NotFound(new { Message = result.ErrorMessage }),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = result.ErrorMessage ?? "Ein unerwarteter Fehler ist aufgetreten." })
            };
        }

        [HttpPut("{id}/status")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> UpdateOrderStatus(Guid id, [FromBody] UpdateOrderStatusRequest request)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var result = await _adminOrderService.UpdateOrderStatusAsync(id, request.NewStatus);

            return result.Type switch
            {
                ServiceResultType.Success => NoContent(),
                ServiceResultType.NotFound => NotFound(new { Message = result.ErrorMessage }),
                ServiceResultType.InvalidInput => BadRequest(new { Message = result.ErrorMessage }),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = result.ErrorMessage ?? "Ein unerwarteter Fehler ist aufgetreten." })
            };
        }

        // Ein kleines DTO für die Status-Update-Anfrage
        public class UpdateOrderStatusRequest
        {
            public OrderStatus NewStatus { get; set; }
        }
    }
}