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

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;
    private readonly IConfiguration _configuration;

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

    [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()
    {
        try
        {
            var user = await _authService.GetCurrentUserAsync(User);
            var planType = TempData[$"PlanType|{user.Id}"].ToString();

            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
        {
            // Parse do plano atual (mesmo que o Dashboard)
            var userPlanType = Enum.TryParse<PlanType>(user.CurrentPlan, true, out var planType) ? planType : PlanType.Trial;
            var currentPlanString = userPlanType.ToString().ToLower();
            var subscription = await _subscriptionRepository.GetByUserIdAsync(user.Id);
            var viewModel = new ManageSubscriptionViewModel
            {
                User = user,
                StripeSubscription = await _paymentService.GetSubscriptionDetailsAsync(user.Id),
                PaymentHistory = await _paymentService.GetPaymentHistoryAsync(user.Id),
                AvailablePlans = GetAvailablePlans(currentPlanString),
                CurrentPeriodEnd = (DateTime?) subscription.CurrentPeriodEnd
            };

            // 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)
        {
            // Parse do plano atual também no catch
            var userPlanType = Enum.TryParse<PlanType>(user.CurrentPlan, true, out var planType) ? planType : PlanType.Trial;
            var currentPlanString = userPlanType.ToString().ToLower();
            
            var errorViewModel = new ManageSubscriptionViewModel
            {
                User = user,
                ErrorMessage = $"Erro ao carregar dados da assinatura: {ex.Message}",
                AvailablePlans = GetAvailablePlans(currentPlanString)
            };
            
            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 plansConfig = _configuration.GetSection("Plans");
        var plans = new List<AvailablePlanViewModel>();

        // Adicionar planos mensais apenas (excluir Trial e planos anuais)
        var monthlyPlans = new[] { "Basic", "Professional", "Premium", "PremiumAffiliate" };
        
        foreach (var planKey in monthlyPlans)
        {
            var planSection = plansConfig.GetSection(planKey);
            if (planSection.Exists())
            {
                plans.Add(new AvailablePlanViewModel
                {
                    PlanType = planKey.ToLower(),
                    DisplayName = planSection["Name"] ?? planKey,
                    Price = decimal.Parse(planSection["Price"] ?? "0", new CultureInfo("en-US")),
                    PriceId = planSection["PriceId"] ?? "",
                    MaxLinks = int.Parse(planSection["MaxLinks"] ?? "0"),
                    AllowAnalytics = bool.Parse(planSection["AllowAnalytics"] ?? "false"),
                    AllowCustomDomain = true, // URL personalizada em todos os planos pagos
                    AllowCustomThemes = bool.Parse(planSection["AllowPremiumThemes"] ?? "false"),
                    AllowProductLinks = bool.Parse(planSection["AllowProductLinks"] ?? "false"),
                    Features = planSection.GetSection("Features").Get<List<string>>() ?? new List<string>(),
                    IsCurrentPlan = currentPlan.Equals(planKey, StringComparison.OrdinalIgnoreCase)
                });
            }
        }

        // Marcar upgrades e filtrar downgrades
        var currentPlanIndex = plans.FindIndex(p => p.IsCurrentPlan);
        
        // Se usuário está no Trial (não encontrou plano atual), todos são upgrades
        if (currentPlanIndex == -1 && (currentPlan == "trial" || currentPlan == "free"))
        {
            foreach (var plan in plans)
            {
                plan.IsUpgrade = true;
            }
            return plans; // Mostrar todos os planos pagos como upgrade
        }
        
        // Para planos pagos, marcar apenas upgrades superiores
        for (int i = 0; i < plans.Count; i++)
        {
            if (i > currentPlanIndex)
                plans[i].IsUpgrade = true;
            else if (i < currentPlanIndex)
                plans[i].IsDowngrade = true;
        }

        // Retornar apenas plano atual e upgrades (Stripe não gerencia downgrades automaticamente)
        return plans.Where(p => p.IsCurrentPlan || p.IsUpgrade).ToList();
    }
}