namespace TaxBaik.Web.Services;

using System.Net.Http;
using System.Net.Http.Json;
using TaxBaik.Domain.Entities;

public interface IFaqBrowserClient
{
    Task<IEnumerable<Faq>> GetAllAsync(CancellationToken ct = default);
    Task<Faq?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<Faq?> CreateAsync(Faq faq, CancellationToken ct = default);
    Task<Faq?> UpdateAsync(int id, Faq faq, CancellationToken ct = default);
    Task<bool> DeleteAsync(int id, CancellationToken ct = default);
}

public class FaqBrowserClient : IFaqBrowserClient
{
    private readonly HttpClient _http;
    private readonly ILogger<FaqBrowserClient> _logger;
    private readonly ITokenStore _tokenStore;

    public FaqBrowserClient(HttpClient http, ILogger<FaqBrowserClient> logger, ITokenStore tokenStore)
    {
        _http = http;
        _logger = logger;
        _tokenStore = tokenStore;
    }

    private void EnsureAuthHeader()
    {
        if (!string.IsNullOrEmpty(_tokenStore.AccessToken) && !_http.DefaultRequestHeaders.Contains("Authorization"))
        {
            _http.DefaultRequestHeaders.Authorization = new("Bearer", _tokenStore.AccessToken);
        }
    }

    public async Task<IEnumerable<Faq>> GetAllAsync(CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var result = await _http.GetFromJsonAsync<FaqListResponse>("faq", cancellationToken: ct);
            return result?.Data ?? [];
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to fetch FAQs");
            throw;
        }
    }

    public async Task<Faq?> GetByIdAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await _http.GetFromJsonAsync<Faq>($"faq/{id}", cancellationToken: ct);
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to fetch FAQ {FaqId}", id);
            throw;
        }
    }

    public async Task<Faq?> CreateAsync(Faq faq, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await _http.PostAsJsonAsync("faq", faq, cancellationToken: ct);
            if (!response.IsSuccessStatusCode) return null;

            var content = await response.Content.ReadAsStringAsync(ct);
            return System.Text.Json.JsonSerializer.Deserialize<Faq>(
                content,
                new System.Text.Json.JsonSerializerOptions { PropertyNameCaseInsensitive = true });
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to create FAQ");
            throw;
        }
    }

    public async Task<Faq?> UpdateAsync(int id, Faq faq, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await _http.PutAsJsonAsync($"faq/{id}", faq, cancellationToken: ct);
            if (!response.IsSuccessStatusCode) return null;

            var content = await response.Content.ReadAsStringAsync(ct);
            return System.Text.Json.JsonSerializer.Deserialize<Faq>(
                content,
                new System.Text.Json.JsonSerializerOptions { PropertyNameCaseInsensitive = true });
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to update FAQ {FaqId}", id);
            throw;
        }
    }

    public async Task<bool> DeleteAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await _http.DeleteAsync($"faq/{id}", cancellationToken: ct);
            return response.IsSuccessStatusCode;
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to delete FAQ {FaqId}", id);
            throw;
        }
    }

    private class FaqListResponse
    {
        public List<Faq> Data { get; set; } = [];
    }
}