namespace TaxBaik.Web.Services.AdminClients;

using System.Text.Json;
using TaxBaik.Domain.Entities;

public interface ITaxFilingScheduleBrowserClient
{
    Task<List<TaxFilingSchedule>> GetAllAsync(CancellationToken ct = default);
    Task<TaxFilingSchedule?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<List<TaxFilingSchedule>> GetByClientIdAsync(int clientId, CancellationToken ct = default);
    Task<List<TaxFilingSchedule>> GetUpcomingDuesAsync(int daysAhead = 30, CancellationToken ct = default);
    Task<int> CreateAsync(int clientId, string filingType, DateTime dueDate, int filingYear,
        int? assignedTo = null, CancellationToken ct = default);
    Task MarkCompletedAsync(int id, CancellationToken ct = default);
    Task DeleteAsync(int id, CancellationToken ct = default);
}

public class TaxFilingScheduleBrowserClient(HttpClient httpClient, ITokenStore tokenStore, ILogger<TaxFilingScheduleBrowserClient> logger)
    : ITaxFilingScheduleBrowserClient
{
    private const string BaseUrl = "/api/taxfilingschedule";

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

    public async Task<List<TaxFilingSchedule>> GetAllAsync(CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<List<TaxFilingSchedule>>($"{BaseUrl}", ct) ?? [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get tax filing schedules");
            return [];
        }
    }

    public async Task<TaxFilingSchedule?> GetByIdAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<TaxFilingSchedule>($"{BaseUrl}/{id}", ct);
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get tax filing schedule {Id}", id);
            return null;
        }
    }

    public async Task<List<TaxFilingSchedule>> GetByClientIdAsync(int clientId, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<List<TaxFilingSchedule>>($"{BaseUrl}/client/{clientId}", ct) ?? [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get filing schedules for client {ClientId}", clientId);
            return [];
        }
    }

    public async Task<List<TaxFilingSchedule>> GetUpcomingDuesAsync(int daysAhead = 30, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.GetFromJsonAsync<JsonElement>($"{BaseUrl}/upcoming?daysAhead={daysAhead}", ct);
            if (response.TryGetProperty("data", out var data))
                return System.Text.Json.JsonSerializer.Deserialize<List<TaxFilingSchedule>>(data.GetRawText()) ?? [];
            return [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get upcoming filings");
            return [];
        }
    }

    public async Task<int> CreateAsync(int clientId, string filingType, DateTime dueDate, int filingYear,
        int? assignedTo = null, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var request = new { clientId, filingType, dueDate, filingYear, assignedTo };
            var response = await httpClient.PostAsJsonAsync(BaseUrl, request, ct);
            response.EnsureSuccessStatusCode();
            var result = await response.Content.ReadFromJsonAsync<JsonElement>(cancellationToken: ct);
            return result.TryGetProperty("id", out var idProp) ? idProp.GetInt32() : 0;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to create tax filing schedule");
            return 0;
        }
    }

    public async Task MarkCompletedAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.PutAsJsonAsync($"{BaseUrl}/{id}/complete", new { }, ct);
            response.EnsureSuccessStatusCode();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to mark filing as completed {Id}", id);
        }
    }

    public async Task DeleteAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.DeleteAsync($"{BaseUrl}/{id}", ct);
            response.EnsureSuccessStatusCode();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to delete tax filing schedule {Id}", id);
        }
    }
}