using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using plushealthtech.Mail;

namespace plushealthtech.Pages
{
    /// <summary>
    /// Handles the footer "Connect" newsletter form (POST /Subscribe).
    /// An API-style page handler: success and failure come back as JSON to
    /// the layout's inline script; Subscribe.cshtml is an empty view that
    /// exists only so the page model is routed.
    /// </summary>
    public class SubscribeModel : PageModel
    {
        private readonly MailSender _mailSender;
        private readonly ILogger<SubscribeModel> _logger;

        public SubscribeModel(MailSender mailSender, ILogger<SubscribeModel> logger)
        {
            _mailSender = mailSender;
            _logger = logger;
        }

        [BindProperty]
        [Required]
        [EmailAddress]
        [StringLength(320)]
        public string Email { get; set; } = string.Empty;

        public async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return new JsonResult(new { success = false, message = "Please enter a valid email address." })
                {
                    StatusCode = StatusCodes.Status400BadRequest
                };
            }

            var body = string.Join("\n", new List<string>
            {
                $"Email: {Email}",
                string.Empty,
                "Subscribed from the footer newsletter form (Connect) on the Plus Health Tech website."
            });

            try
            {
                await _mailSender.SendAsync($"New newsletter subscription — {Email}", body);
                return new JsonResult(new { success = true, message = "You're on the list — thanks for subscribing!" });
            }
            catch (Exception ex)
            {
                // Log the full exception; never surface SMTP details to the user.
                _logger.LogError(ex, "Failed to send newsletter subscription for {Email}", Email);
                return new JsonResult(new { success = false, message = "We couldn't sign you up right now. Please try again later." })
                {
                    StatusCode = StatusCodes.Status500InternalServerError
                };
            }
        }
    }
}