namespace TaxBaik.Web.Services;

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

public interface IAnnouncementBrowserClient
{
    Task<IEnumerable<Announcement>> GetAllAsync(CancellationToken ct = default);
    Task<Announcement?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<Announcement?> CreateAsync(AnnouncementDto dto, CancellationToken ct = default);
    Task<Announcement?> UpdateAsync(int id, AnnouncementDto dto, CancellationToken ct = default);
    Task<bool> DeleteAsync(int id, CancellationToken ct = default);
}

public class AnnouncementBrowserClient : IAnnouncementBrowserClient
{
    private readonly HttpClient _http;
    private readonly ILogger<AnnouncementBrowserClient> _logger;
    private readonly ITokenStore _tokenStore;

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

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

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

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

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

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

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

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

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

    private class AnnouncementListResponse
    {
        public List<Announcement> Data { get; set; } = [];
    }
}
