using Microsoft.AspNetCore.Mvc;
using Nop.Plugin.Misc.FruitBankPlugin.Services;
using Nop.Services.Configuration;
using Nop.Web.Framework.Controllers;

namespace Nop.Plugin.Misc.FruitBankPlugin.Controllers;

/// <summary>
/// Külső rendszerek (Viber bot, email feldolgozó, diktáló app) hívják ezt az endpointot.
/// Authentikáció: X-FruitBank-ApiKey header, értéke megegyezik a FruitBankSettings.OrderDraftApiKey-jel.
/// </summary>
public class OrderDraftApiController : BasePluginController
{
    private readonly IOrderDraftService _orderDraftService;
    private readonly FruitBankSettings _settings;

    public OrderDraftApiController(
        IOrderDraftService orderDraftService,
        ISettingService settingService)
    {
        _orderDraftService = orderDraftService;
        _settings = settingService.LoadSetting<FruitBankSettings>();
    }

    /// <summary>
    /// POST /api/order-draft
    /// Body: { "externalUsername": "...", "messageText": "..." }
    /// Header: X-FruitBank-ApiKey: {key}
    /// </summary>
    [HttpPost]
    public async Task<IActionResult> Create([FromBody] OrderDraftApiRequest request)
    {
        // API key validáció
        if (!ValidateApiKey())
            return Unauthorized(new { error = "Érvénytelen vagy hiányzó API kulcs." });

        if (request == null
            || string.IsNullOrWhiteSpace(request.ExternalUsername)
            || string.IsNullOrWhiteSpace(request.MessageText))
        {
            return BadRequest(new { error = "ExternalUsername és MessageText megadása kötelező." });
        }

        try
        {
            var drafts = await _orderDraftService.CreateDraftsFromMessageAsync(
                request.ExternalUsername.Trim(),
                request.MessageText.Trim());

            if (!drafts.Any())
                return Ok(new OrderDraftApiResponse
                {
                    Success  = false,
                    Message  = "Az üzenetből nem sikerült rendelési szándékot azonosítani.",
                    Drafts   = []
                });

            return Ok(new OrderDraftApiResponse
            {
                Success = true,
                Message = $"{drafts.Count} rendelés tervezet létrehozva.",
                Drafts  = drafts.Select(d => new OrderDraftApiResponseItem
                {
                    DraftId          = d.Id,
                    ParsedDeliveryDate = d.ParsedDeliveryDate,
                    IsPartnerKnown   = d.CustomerId.HasValue,
                    ItemCount        = d.Items?.Count ?? 0
                }).ToList()
            });
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine($"[OrderDraftApiController] Error: {ex}");
            return StatusCode(500, new { error = "Belső hiba. Próbáld újra később." });
        }
    }

    private bool ValidateApiKey()
    {
        if (string.IsNullOrWhiteSpace(_settings.OrderDraftApiKey))
            return false;

        Request.Headers.TryGetValue("X-FruitBank-ApiKey", out var providedKey);
        return string.Equals(
            _settings.OrderDraftApiKey,
            providedKey.ToString(),
            StringComparison.Ordinal);
    }
}

// ── Request / Response modellek ───────────────────────────────────────────

public class OrderDraftApiRequest
{
    public string ExternalUsername { get; set; } = string.Empty;
    public string MessageText { get; set; } = string.Empty;
}

public class OrderDraftApiResponse
{
    public bool Success { get; set; }
    public string Message { get; set; } = string.Empty;
    public List<OrderDraftApiResponseItem> Drafts { get; set; } = [];
}

public class OrderDraftApiResponseItem
{
    public int DraftId { get; set; }
    public DateTime ParsedDeliveryDate { get; set; }
    public bool IsPartnerKnown { get; set; }
    public int ItemCount { get; set; }
}