using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OTSSignsOrchestrator.Core.Configuration;

namespace OTSSignsOrchestrator.Core.Services;

/// <summary>
/// Tests connectivity to deployed Xibo CMS instances using OAuth2.
/// </summary>
public class XiboApiService
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly XiboOptions _options;
    private readonly ILogger<XiboApiService> _logger;

    public XiboApiService(
        IHttpClientFactory httpClientFactory,
        IOptions<XiboOptions> options,
        ILogger<XiboApiService> logger)
    {
        _httpClientFactory = httpClientFactory;
        _options = options.Value;
        _logger = logger;
    }

    public async Task<XiboTestResult> TestConnectionAsync(string instanceUrl, string username, string password)
    {
        _logger.LogInformation("Testing Xibo connection to {InstanceUrl}", instanceUrl);

        var client = _httpClientFactory.CreateClient("XiboApi");
        client.Timeout = TimeSpan.FromSeconds(_options.TestConnectionTimeoutSeconds);

        try
        {
            var baseUrl = instanceUrl.TrimEnd('/');
            var tokenUrl = $"{baseUrl}/api/authorize/access_token";

            var formContent = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("grant_type", "client_credentials"),
                new KeyValuePair<string, string>("client_id", username),
                new KeyValuePair<string, string>("client_secret", password)
            });

            var response = await client.PostAsync(tokenUrl, formContent);

            if (response.IsSuccessStatusCode)
            {
                _logger.LogInformation("Xibo connection test succeeded for {InstanceUrl}", instanceUrl);
                return new XiboTestResult
                {
                    IsValid = true,
                    Message = "Connected successfully.",
                    HttpStatus = (int)response.StatusCode
                };
            }

            _logger.LogWarning("Xibo connection test failed: {InstanceUrl} | status={StatusCode}",
                instanceUrl, (int)response.StatusCode);

            return new XiboTestResult
            {
                IsValid = false,
                Message = response.StatusCode switch
                {
                    System.Net.HttpStatusCode.Unauthorized => "Invalid Xibo credentials.",
                    System.Net.HttpStatusCode.Forbidden => "User lacks API permissions.",
                    System.Net.HttpStatusCode.ServiceUnavailable => "Xibo instance not ready.",
                    _ => $"Unexpected response: {(int)response.StatusCode}"
                },
                HttpStatus = (int)response.StatusCode
            };
        }
        catch (TaskCanceledException)
        {
            return new XiboTestResult { IsValid = false, Message = "Connection timed out." };
        }
        catch (HttpRequestException ex)
        {
            return new XiboTestResult { IsValid = false, Message = $"Cannot reach Xibo instance: {ex.Message}" };
        }
    }
}

public class XiboTestResult
{
    public bool IsValid { get; set; }
    public string Message { get; set; } = string.Empty;
    public int HttpStatus { get; set; }
}