using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.RateLimiting;
using PowderCoating.Core.Interfaces;
using PowderCoating.Shared.Constants;

namespace PowderCoating.Web.Controllers;

/// <summary>
/// Handles customer self-service email opt-out via tokenized links.
/// No authentication required — the token IS the proof of identity.
/// </summary>
[AllowAnonymous]
[EnableRateLimiting(AppConstants.RateLimitPolicies.Public)]
public class UnsubscribeController : Controller
{
    private readonly IUnitOfWork _unitOfWork;
    private readonly ILogger<UnsubscribeController> _logger;

    public UnsubscribeController(IUnitOfWork unitOfWork, ILogger<UnsubscribeController> logger)
    {
        _unitOfWork = unitOfWork;
        _logger = logger;
    }

    /// <summary>
    /// GET /Unsubscribe/Email/{token}
    /// Called when a customer clicks the unsubscribe link in an email.
    /// Sets NotifyByEmail = false and shows a confirmation page.
    /// </summary>
    [HttpGet]
    [Route("Unsubscribe/Email/{token}")]
    public async Task<IActionResult> Email(string token)
    {
        if (string.IsNullOrWhiteSpace(token))
            return View("Invalid");

        try
        {
            // ignoreQueryFilters=true so we can find the customer by token
            // regardless of company context (the user clicking is not authenticated)
            var customer = await _unitOfWork.Customers.FirstOrDefaultAsync(
                c => c.UnsubscribeToken == token && !c.IsDeleted, ignoreQueryFilters: true);

            if (customer == null)
            {
                _logger.LogWarning("Unsubscribe attempt with unknown token: {Token}", token);
                return View("Invalid");
            }

            if (!customer.NotifyByEmail)
            {
                ViewBag.CustomerName = customer.CompanyName ?? $"{customer.ContactFirstName} {customer.ContactLastName}".Trim();
                ViewBag.AlreadyUnsubscribed = true;
                return View("EmailConfirm");
            }

            customer.NotifyByEmail = false;
            customer.UpdatedAt = DateTime.UtcNow;
            await _unitOfWork.CompleteAsync();

            _logger.LogInformation("Customer {CustomerId} unsubscribed from email notifications via link", customer.Id);

            ViewBag.CustomerName = customer.CompanyName ?? $"{customer.ContactFirstName} {customer.ContactLastName}".Trim();
            ViewBag.AlreadyUnsubscribed = false;
            return View("EmailConfirm");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error processing unsubscribe for token {Token}", token);
            return View("Invalid");
        }
    }

    /// <summary>
    /// GET /Unsubscribe/BroadcastEmail/{token}
    /// Opts a company's primary contact out of platform broadcast/marketing emails.
    /// </summary>
    [HttpGet]
    [Route("Unsubscribe/BroadcastEmail/{token}")]
    public async Task<IActionResult> BroadcastEmail(string token)
    {
        if (string.IsNullOrWhiteSpace(token))
            return View("Invalid");

        try
        {
            var company = await _unitOfWork.Companies.FirstOrDefaultAsync(
                c => c.MarketingUnsubscribeToken == token && !c.IsDeleted, ignoreQueryFilters: true);

            if (company == null)
            {
                _logger.LogWarning("Broadcast unsubscribe attempt with unknown token: {Token}", token);
                return View("Invalid");
            }

            ViewBag.CompanyName = company.CompanyName;
            ViewBag.AlreadyUnsubscribed = company.MarketingEmailOptOut;

            if (!company.MarketingEmailOptOut)
            {
                company.MarketingEmailOptOut = true;
                company.UpdatedAt = DateTime.UtcNow;
                await _unitOfWork.CompleteAsync();
                _logger.LogInformation("Company {CompanyId} opted out of broadcast emails via link", company.Id);
            }

            return View("BroadcastEmailConfirm");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error processing broadcast unsubscribe for token {Token}", token);
            return View("Invalid");
        }
    }
}