namespace TaxBaik.Web.Services;

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

/// <summary>
/// Client API Client for Admin Blazor
/// SOLID: Single Responsibility - Client API calls only
/// </summary>
public interface IClientBrowserClient
{
    Task<(IEnumerable<Client> Items, int Total)> GetPagedAsync(
        int page = 1, int pageSize = 20, string? status = null, string? search = null, CancellationToken ct = default);
    Task<Client?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<Client?> CreateAsync(CreateClientDto dto, CancellationToken ct = default);
    Task<Client?> UpdateAsync(int id, CreateClientDto dto, CancellationToken ct = default);
    Task<bool> DeleteAsync(int id, CancellationToken ct = default);
}

public class ClientBrowserClient : IClientBrowserClient
{
    private readonly HttpClient _http;
    private readonly ILogger<ClientBrowserClient> _logger;
    private readonly ITokenStore _tokenStore;

    public ClientBrowserClient(HttpClient http, ILogger<ClientBrowserClient> 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<Client> Items, int Total)> GetPagedAsync(
        int page = 1, int pageSize = 20, string? status = null, string? search = null, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var query = $"client?page={page}&pageSize={pageSize}";
            if (!string.IsNullOrEmpty(status))
                query += $"&status={status}";
            if (!string.IsNullOrEmpty(search))
                query += $"&search={Uri.EscapeDataString(search)}";

            var result = await _http.GetFromJsonAsync<ClientPagedResponse>(query, cancellationToken: ct);
            return result != null ? (result.Data, result.Total) : ([], 0);
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, "Failed to fetch clients");
            throw;
        }
    }

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

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

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

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

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

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

    private class ClientPagedResponse
    {
        public List<Client> Data { get; set; } = [];
        public int Total { get; set; }
    }
}