using System.Net.Http.Json;
using FluentResults;
using NexusReader.Application.Abstractions.Services;
using NexusReader.Application.Queries.Reader;

namespace NexusReader.Web.Client.Services;

public class WasmEpubService : IEpubService
{
    private readonly HttpClient _httpClient;

    public WasmEpubService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<Result<ReaderPageViewModel>> GetEpubContentAsync(int chapterIndex)
    {
        try
        {
            var response = await _httpClient.GetAsync($"/api/epub/{chapterIndex}");
            if (response.IsSuccessStatusCode)
            {
                var viewModel = await response.Content.ReadFromJsonAsync<ReaderPageViewModel>();
                return viewModel != null ? Result.Ok(viewModel) : Result.Fail("Failed to deserialize response.");
            }
            
            // Try to read the error message from the body
            var errorBody = await response.Content.ReadAsStringAsync();
            return Result.Fail($"Server error ({response.StatusCode}): {errorBody}");
        }
        catch (Exception ex)
        {
            // Fallback for network errors or parsing exceptions
            return Result.Fail(new Error($"Network or parsing error: {ex.Message}").CausedBy(ex));
        }
    }
}