// src/Webshop.Api/Controllers/Admin/AdminUsersController.cs
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using Webshop.Application.DTOs.Users;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Webshop.Application;
using Webshop.Application.Services.Admin.Interfaces;
using Microsoft.AspNetCore.Http;

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

        public AdminUsersController(IAdminUserService adminUserService)
        {
            _adminUserService = adminUserService;
        }

        [HttpGet]
        [ProducesResponseType(typeof(IEnumerable<UserDto>), StatusCodes.Status200OK)]
        public async Task<IActionResult> GetAllUsers()
        {
            var result = await _adminUserService.GetAllUsersAsync();
            return Ok(result.Value);
        }



        [HttpGet("{userId}")]
        [ProducesResponseType(typeof(UserDto), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> GetUserById(string userId)
        {
            var result = await _adminUserService.GetUserByIdAsync(userId);

            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("{userId}/roles")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> UpdateUserRoles(string userId, [FromBody] UpdateUserRolesRequest request)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var result = await _adminUserService.UpdateUserRolesAsync(userId, request.NewRoles);

            return result.Type switch
            {
                ServiceResultType.Success => NoContent(),
                ServiceResultType.NotFound => NotFound(new { Message = result.ErrorMessage }),
                ServiceResultType.Failure => BadRequest(new { Message = result.ErrorMessage }), // Identity errors are often validation-like
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = result.ErrorMessage ?? "Ein unerwarteter Fehler ist aufgetreten." })
            };
        }

        [HttpDelete("{userId}")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> DeleteUser(string userId)
        {
            var result = await _adminUserService.DeleteUserAsync(userId);

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

        // Kleines DTO für die Anfrage zum Rollen-Update
        public class UpdateUserRolesRequest
        {
            public List<string> NewRoles { get; set; } = new List<string>();
        }
    }
}