// src/Webshop.Api/Controllers/Customer/CheckoutController.cs
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using System.Threading.Tasks;
using Webshop.Application.Services.Customers.Interfaces;
using Webshop.Application.DTOs.Orders;
using Webshop.Application.DTOs.Shipping; // Neu
using System.Security.Claims;
using Microsoft.AspNetCore.Http;
using Webshop.Application;
using System.Collections.Generic;
using Webshop.Application.Services.Customers;
using Microsoft.AspNetCore.Cors.Infrastructure;

namespace Webshop.Api.Controllers.Customer
{
    [ApiController]
    [Route("api/v1/customer/[controller]")]
    [Authorize(Roles = "Customer")]
    public class CheckoutController : ControllerBase
    {
        private readonly ICheckoutService _checkoutService;
        private readonly ICartService _cartService;

        public CheckoutController(ICheckoutService checkoutService , ICartService cartService)
        {
            _checkoutService = checkoutService;
            _cartService = cartService;
        }

        [HttpGet("available-shipping-methods")] // War vorher POST
        [ProducesResponseType(typeof(IEnumerable<ShippingMethodDto>), StatusCodes.Status200OK)]
        public async Task<IActionResult> GetAvailableShippingMethods()
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);

            // 1. Warenkorb laden
            var cartResult = await _cartService.GetCartAsync(userId!);
            if (cartResult.Value == null || !cartResult.Value.Items.Any())
            {
                return Ok(new List<ShippingMethodDto>()); // Leerer Korb -> keine Methoden
            }

            // 2. Berechnung aufrufen (nutzt die Overload Methode mit List<CartItemDto>)
            var result = await _checkoutService.GetCompatibleShippingMethodsAsync(cartResult.Value.Items);

            return result.Type switch
            {
                ServiceResultType.Success => Ok(result.Value),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = "Fehler." })
            };
        }

        [HttpPost("create-order")]
        [ProducesResponseType(typeof(OrderDetailDto), StatusCodes.Status201Created)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status401Unauthorized)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status409Conflict)]
        public async Task<IActionResult> CreateOrder([FromBody] CreateOrderDto orderDto)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            if (string.IsNullOrEmpty(userId))
            {
                return Unauthorized(new { Message = "Benutzer konnte nicht identifiziert werden." });
            }

            var result = await _checkoutService.CreateOrderAsync(orderDto, userId);

            return result.Type switch
            {
                ServiceResultType.Success => Created($"/api/v1/customer/orders/{result.Value!.Id}", result.Value),
                ServiceResultType.InvalidInput => BadRequest(new { Message = result.ErrorMessage }),
                ServiceResultType.Conflict => Conflict(new { Message = result.ErrorMessage }),
                ServiceResultType.Unauthorized => Unauthorized(new { Message = result.ErrorMessage }),
                ServiceResultType.Forbidden => Forbid(),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = result.ErrorMessage ?? "Ein unerwarteter Fehler ist aufgetreten." })
            };
        }
    }
}