namespace TaxBaik.Web.Services;

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

/// <summary>
/// TaxFiling API Client for Admin Blazor
/// </summary>
public interface ITaxFilingBrowserClient
{
    Task<IEnumerable<TaxFiling>> GetUpcomingAsync(int daysAhead = 30, CancellationToken ct = default);
    Task<IEnumerable<TaxFiling>> GetByClientIdAsync(int clientId, CancellationToken ct = default);
    Task<TaxFiling?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<TaxFiling?> CreateAsync(TaxFiling filing, CancellationToken ct = default);
    Task<TaxFiling?> UpdateAsync(int id, TaxFiling filing, CancellationToken ct = default);
    Task<bool> DeleteAsync(int id, CancellationToken ct = default);
}

public class TaxFilingBrowserClient : ITaxFilingBrowserClient
{
    private readonly HttpClient _http;
    private readonly ILogger<TaxFilingBrowserClient> _logger;
    private readonly ITokenStore _tokenStore;

    public TaxFilingBrowserClient(HttpClient http, ILogger<TaxFilingBrowserClient> 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<TaxFiling>> GetUpcomingAsync(int daysAhead = 30, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var result = await _http.GetFromJsonAsync<TaxFilingListResponse>(
                $"taxfiling/upcoming?daysAhead={daysAhead}", cancellationToken: ct);
            return result?.Data ?? [];
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to fetch upcoming filings");
            throw;
        }
    }

    public async Task<IEnumerable<TaxFiling>> GetByClientIdAsync(int clientId, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var result = await _http.GetFromJsonAsync<TaxFilingListResponse>(
                $"taxfiling/client/{clientId}", cancellationToken: ct);
            return result?.Data ?? [];
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to fetch filings for client {ClientId}", clientId);
            throw;
        }
    }

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

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

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

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

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

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

    private class TaxFilingListResponse
    {
        public List<TaxFiling> Data { get; set; } = [];
    }
}