using System;
using System.Net;
using System.Threading.Tasks;
using Pathoschild.Http.Client;

namespace StardewModdingAPI.Web.Framework.Clients.Pastebin
{
    /// <summary>An API client for Pastebin.</summary>
    internal class PastebinClient : IPastebinClient
    {
        /*********
        ** Fields
        *********/
        /// <summary>The underlying HTTP client.</summary>
        private readonly IClient Client;


        /*********
        ** Public methods
        *********/
        /// <summary>Construct an instance.</summary>
        /// <param name="baseUrl">The base URL for the Pastebin API.</param>
        /// <param name="userAgent">The user agent for the API client.</param>
        public PastebinClient(string baseUrl, string userAgent)
        {
            this.Client = new FluentClient(baseUrl).SetUserAgent(userAgent);
        }

        /// <summary>Fetch a saved paste.</summary>
        /// <param name="id">The paste ID.</param>
        public async Task<PasteInfo> GetAsync(string id)
        {
            try
            {
                // get from API
                string? content = await this.Client
                    .GetAsync($"raw/{id}")
                    .AsString();

                // handle Pastebin errors
                if (string.IsNullOrWhiteSpace(content))
                    return new PasteInfo(null, "Received an empty response from Pastebin.");
                if (content.StartsWith("<!DOCTYPE"))
                    return new PasteInfo(null, $"Received a captcha challenge from Pastebin. Please visit https://pastebin.com/{id} in a new window to solve it.");
                return new PasteInfo(content, null);
            }
            catch (ApiException ex) when (ex.Status == HttpStatusCode.NotFound)
            {
                return new PasteInfo(null, "There's no log with that ID.");
            }
            catch (Exception ex)
            {
                return new PasteInfo(null, $"Pastebin error: {ex}");
            }
        }

        /// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
        public void Dispose()
        {
            this.Client.Dispose();
        }
    }
}