// src/Webshop.Api/Controllers/Admin/AdminSuppliersController.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.Suppliers;
using Webshop.Application.Services.Admin.Interfaces;

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

        public AdminSuppliersController(IAdminSupplierService adminSupplierService)
        {
            _adminSupplierService = adminSupplierService;
        }

        [HttpGet]
        [ProducesResponseType(typeof(IEnumerable<SupplierDto>), StatusCodes.Status200OK)]
        public async Task<IActionResult> GetAllSuppliers()
        {
            var result = await _adminSupplierService.GetAllSuppliersAsync();
            return Ok(result.Value);
        }

        [HttpGet("{id:guid}")]
        [ProducesResponseType(typeof(SupplierDto), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> GetSupplierById(Guid id)
        {
            var result = await _adminSupplierService.GetSupplierByIdAsync(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." })
            };
        }

        [HttpPost]
        [ProducesResponseType(typeof(SupplierDto), StatusCodes.Status201Created)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status409Conflict)]
        public async Task<IActionResult> CreateSupplier([FromBody] SupplierDto supplierDto)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var result = await _adminSupplierService.CreateSupplierAsync(supplierDto);

            return result.Type switch
            {
                ServiceResultType.Success => CreatedAtAction(nameof(GetSupplierById), new { id = result.Value!.Id }, result.Value),
                ServiceResultType.Conflict => Conflict(new { Message = result.ErrorMessage }),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { Message = result.ErrorMessage ?? "Ein unerwarteter Fehler ist aufgetreten." })
            };
        }

        [HttpPut("{id:guid}")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status409Conflict)]
        public async Task<IActionResult> UpdateSupplier(Guid id, [FromBody] SupplierDto supplierDto)
        {
            if (id != supplierDto.Id)
            {
                return BadRequest(new { Message = "ID in der URL und im Body stimmen nicht überein." });
            }
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var result = await _adminSupplierService.UpdateSupplierAsync(supplierDto);

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

        [HttpDelete("{id:guid}")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
        public async Task<IActionResult> DeleteSupplier(Guid id)
        {
            var result = await _adminSupplierService.DeleteSupplierAsync(id);

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