using BCards.Web.Models;
using BCards.Web.Repositories;
using BCards.Web.Services;
using BCards.Web.ViewModels;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;

namespace BCards.Web.Controllers;

[Authorize]
public class PaymentController : Controller
{
    private readonly IPaymentService _paymentService;
    private readonly IAuthService _authService;
    private readonly IUserRepository _userService;
    private readonly ISubscriptionRepository _subscriptionRepository;

    public PaymentController(IPaymentService paymentService, IAuthService authService, IUserRepository userService, ISubscriptionRepository subscriptionRepository)
    {
        _paymentService = paymentService;
        _authService = authService;
        _userService = userService;
        _subscriptionRepository = subscriptionRepository;
    }

    [HttpPost]
    public async Task<IActionResult> CreateCheckoutSession(string planType)
    {
        var user = await _authService.GetCurrentUserAsync(User);
        if (user == null)
            return RedirectToAction("Login", "Auth");

        var successUrl = Url.Action("Success", "Payment", null, Request.Scheme);
        var cancelUrl = Url.Action("Cancel", "Payment", null, Request.Scheme);

        TempData[$"PlanType|{user.Id}"] = planType;

        try
        {
            var checkoutUrl = await _paymentService.CreateCheckoutSessionAsync(
                user.Id,
                planType,
                successUrl!,
                cancelUrl!);

            return Redirect(checkoutUrl);
        }
        catch (Exception ex)
        {
            TempData["Error"] = $"Erro ao processar pagamento: {ex.Message}";
            return RedirectToAction("Pricing", "Home");
        }
    }

    public async Task<IActionResult> Success()
    {
        var user = await _authService.GetCurrentUserAsync(User);
        var planType = TempData[$"PlanType|{user.Id}"].ToString();

        try
        {
            if (!string.IsNullOrEmpty(planType) && Enum.TryParse<PlanType>(planType, out var plan))
            {
                user.CurrentPlan = plan.ToString();
                user.SubscriptionStatus = "active";
                await _userService.UpdateAsync(user); // ou o método equivalente

                TempData["Success"] = $"Assinatura {planType} ativada com sucesso!";
            }

            return RedirectToAction("Dashboard", "Admin");
        }
        catch (Exception ex)
        {
            TempData["Error"] = $"Erro ao processar pagamento: {ex.Message}";
            return RedirectToAction("Dashboard", "Admin");
        }
    }

    public IActionResult Cancel()
    {
        TempData["Info"] = "Pagamento cancelado. Você pode tentar novamente quando quiser.";
        return RedirectToAction("Pricing", "Home");
    }

    [HttpPost]
    [Route("webhook/stripe")]
    [AllowAnonymous]
    public async Task<IActionResult> StripeWebhook()
    {
        var signature = Request.Headers["Stripe-Signature"].FirstOrDefault();
        if (string.IsNullOrEmpty(signature))
            return BadRequest();

        string requestBody;
        using (var reader = new StreamReader(Request.Body))
        {
            requestBody = await reader.ReadToEndAsync();
        }

        try
        {
            await _paymentService.HandleWebhookAsync(requestBody, signature);
            return Ok();
        }
        catch (Exception ex)
        {
            return BadRequest($"Webhook error: {ex.Message}");
        }
    }

    public async Task<IActionResult> ManageSubscription()
    {
        var user = await _authService.GetCurrentUserAsync(User);
        if (user == null)
            return RedirectToAction("Login", "Auth");

        try
        {
            var viewModel = new ManageSubscriptionViewModel
            {
                User = user,
                StripeSubscription = await _paymentService.GetSubscriptionDetailsAsync(user.Id),
                PaymentHistory = await _paymentService.GetPaymentHistoryAsync(user.Id),
                AvailablePlans = GetAvailablePlans(user.CurrentPlan)
            };

            // Pegar assinatura local se existir
            if (!string.IsNullOrEmpty(user.StripeCustomerId))
            {
                // Aqui você poderia buscar a subscription local se necessário
                // viewModel.LocalSubscription = await _subscriptionRepository.GetByUserIdAsync(user.Id);
            }

            return View(viewModel);
        }
        catch (Exception ex)
        {
            var errorViewModel = new ManageSubscriptionViewModel
            {
                User = user,
                ErrorMessage = $"Erro ao carregar dados da assinatura: {ex.Message}",
                AvailablePlans = GetAvailablePlans(user.CurrentPlan)
            };
            
            return View(errorViewModel);
        }
    }

    [HttpPost]
    public async Task<IActionResult> CancelSubscription(string subscriptionId)
    {
        try
        {
            await _paymentService.CancelSubscriptionAsync(subscriptionId);
            TempData["Success"] = "Sua assinatura será cancelada no final do período atual.";
        }
        catch (Exception ex)
        {
            TempData["Error"] = $"Erro ao cancelar assinatura: {ex.Message}";
        }

        return RedirectToAction("ManageSubscription");
    }

    [HttpPost]
    public async Task<IActionResult> ChangePlan(string newPlanType)
    {
        var user = await _authService.GetCurrentUserAsync(User);
        if (user == null)
            return RedirectToAction("Login", "Auth");

        try
        {
            // Para mudanças de plano, vamos usar o Stripe Checkout
            var returnUrl = Url.Action("ManageSubscription", "Payment", null, Request.Scheme);
            var cancelUrl = Url.Action("ManageSubscription", "Payment", null, Request.Scheme);

            var checkoutUrl = await _paymentService.CreateCheckoutSessionAsync(
                user.Id, 
                newPlanType, 
                returnUrl!, 
                cancelUrl!);

            return Redirect(checkoutUrl);
        }
        catch (Exception ex)
        {
            TempData["Error"] = $"Erro ao alterar plano: {ex.Message}";
            return RedirectToAction("ManageSubscription");
        }
    }

    [HttpPost]
    public async Task<IActionResult> OpenStripePortal()
    {
        var user = await _authService.GetCurrentUserAsync(User);
        if (user == null || string.IsNullOrEmpty(user.StripeCustomerId))
        {
            TempData["Error"] = "Erro: dados de assinatura não encontrados.";
            return RedirectToAction("ManageSubscription");
        }

        try
        {
            var returnUrl = Url.Action("ManageSubscription", "Payment", null, Request.Scheme);
            var portalUrl = await _paymentService.CreatePortalSessionAsync(user.StripeCustomerId, returnUrl!);
            
            return Redirect(portalUrl);
        }
        catch (Exception ex)
        {
            TempData["Error"] = $"Erro ao abrir portal de pagamento: {ex.Message}";
            return RedirectToAction("ManageSubscription");
        }
    }

    private List<AvailablePlanViewModel> GetAvailablePlans(string currentPlan)
    {
        var plans = new List<AvailablePlanViewModel>
        {
            new()
            {
                PlanType = "basic",
                DisplayName = "Básico",
                Price = 9.90m,
                PriceId = "price_basic", // Substitua pelos IDs reais do Stripe
                MaxLinks = 5,
                AllowAnalytics = true,
                Features = new List<string> { "5 links", "Temas básicos", "Análises básicas" },
                IsCurrentPlan = currentPlan == "basic"
            },
            new()
            {
                PlanType = "professional",
                DisplayName = "Profissional",
                Price = 24.90m,
                PriceId = "price_professional", // Substitua pelos IDs reais do Stripe
                MaxLinks = 15,
                AllowAnalytics = true,
                AllowCustomDomain = true,
                Features = new List<string> { "15 links", "Todos os temas", "Domínio personalizado", "Análises avançadas" },
                IsCurrentPlan = currentPlan == "professional"
            },
            new()
            {
                PlanType = "premium",
                DisplayName = "Premium",
                Price = 29.90m,
                PriceId = "price_premium", // Substitua pelos IDs reais do Stripe
                MaxLinks = -1, // Ilimitado
                AllowCustomThemes = true,
                AllowAnalytics = true,
                AllowCustomDomain = true,
                Features = new List<string> { "Links ilimitados", "Temas personalizados", "Múltiplos domínios", "Suporte prioritário" },
                IsCurrentPlan = currentPlan == "premium"
            }
        };

        // Marcar upgrades e downgrades
        var currentPlanIndex = plans.FindIndex(p => p.IsCurrentPlan);
        for (int i = 0; i < plans.Count; i++)
        {
            if (i > currentPlanIndex)
                plans[i].IsUpgrade = true;
            else if (i < currentPlanIndex)
                plans[i].IsDowngrade = true;
        }

        return plans;
    }
}