using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using System.Text.Json.Serialization;
using CMSMicroservice.Application.Common.Interfaces;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace CMSMicroservice.Infrastructure.Services;

/// <summary>
/// پیاده‌سازی سرویس چتیکا با HttpClient
/// API: POST /api/v1/organizations/register-user
/// </summary>
public class ChatikaApiService : IChatikaApiService
{
    private readonly HttpClient _httpClient;
    private readonly ILogger<ChatikaApiService> _logger;
    private readonly string _baseUrl;
    private readonly string _apiKey;

    public ChatikaApiService(
        HttpClient httpClient,
        ILogger<ChatikaApiService> logger,
        IConfiguration configuration)
    {
        _httpClient = httpClient;
        _logger = logger;
        
        // تنظیمات از appsettings.json
        _baseUrl = configuration["Chatika:BaseUrl"] ?? "https://api.chatika.ir";
        _apiKey = configuration["Chatika:ApiKey"] ?? "";
        
        // تنظیم HttpClient
        _httpClient.BaseAddress = new Uri(_baseUrl);
        if (!string.IsNullOrEmpty(_apiKey))
        {
            _httpClient.DefaultRequestHeaders.Add("X-API-Key", _apiKey);
        }
    }

    /// <inheritdoc />
    public async Task<ChatikaAccountResult> CreateAccountAsync(
        string mobileNumber, 
        string fullName,
        CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation(
                "🤖 Creating Chatika account for mobile: {Mobile}", 
                mobileNumber.Substring(0, 4) + "***");

            var request = new ChatikaRegisterRequest
            {
                MobileNumber = mobileNumber
            };

            var response = await _httpClient.PostAsJsonAsync(
                "/api/v1/organizations/register-user", 
                request, 
                cancellationToken);

            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadFromJsonAsync<ChatikaRegisterResponse>(
                    cancellationToken: cancellationToken);

                _logger.LogInformation(
                    "✅ Chatika account created successfully. UserId: {UserId}, IsNewUser: {IsNew}, Credit: {Credit}", 
                    result?.Id,
                    result?.IsNewUser,
                    result?.CreditCharged);

                return ChatikaAccountResult.Success(
                    chatikaUserId: result?.Id.ToString(),
                    accessUrl: "https://chatika.ir"
                );
            }

            var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
            var errorResponse = JsonSerializer.Deserialize<ChatikaErrorResponse>(errorContent);
            
            _logger.LogWarning(
                "⚠️ Chatika API returned error. Status: {Status}, Code: {ErrorCode}, Message: {Message}", 
                response.StatusCode,
                errorResponse?.ErrorCode,
                errorResponse?.Message);

            return ChatikaAccountResult.Failure($"{errorResponse?.ErrorCode}: {errorResponse?.Message}");
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "❌ Network error calling Chatika API");
            return ChatikaAccountResult.Failure($"خطای شبکه: {ex.Message}");
        }
        catch (TaskCanceledException ex) when (ex.InnerException is TimeoutException)
        {
            _logger.LogError(ex, "❌ Timeout calling Chatika API");
            return ChatikaAccountResult.Failure("تایم‌اوت در ارتباط با سرویس چتیکا");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "❌ Unexpected error calling Chatika API");
            return ChatikaAccountResult.Failure($"خطای غیرمنتظره: {ex.Message}");
        }
    }
    
    /// <summary>
    /// Request model برای ثبت کاربر در چتیکا
    /// </summary>
    private class ChatikaRegisterRequest
    {
        [JsonPropertyName("mobile_number")]
        public string MobileNumber { get; set; } = string.Empty;
    }
    
    /// <summary>
    /// Response model موفق از چتیکا
    /// </summary>
    private class ChatikaRegisterResponse
    {
        [JsonPropertyName("id")]
        public long Id { get; set; }
        
        [JsonPropertyName("mobile_number")]
        public string MobileNumber { get; set; } = string.Empty;
        
        [JsonPropertyName("organization_id")]
        public long OrganizationId { get; set; }
        
        [JsonPropertyName("organization_title")]
        public string OrganizationTitle { get; set; } = string.Empty;
        
        [JsonPropertyName("wallet_balance")]
        public decimal WalletBalance { get; set; }
        
        [JsonPropertyName("is_new_user")]
        public bool IsNewUser { get; set; }
        
        [JsonPropertyName("credit_charged")]
        public decimal CreditCharged { get; set; }
    }
    
    /// <summary>
    /// Response model خطا از چتیکا
    /// </summary>
    private class ChatikaErrorResponse
    {
        [JsonPropertyName("error_code")]
        public string ErrorCode { get; set; } = string.Empty;
        
        [JsonPropertyName("message")]
        public string Message { get; set; } = string.Empty;
    }
}