using BlueLaminate.Core.Listings;
using BlueLaminate.Scraper.CsFloat;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System.CommandLine;

namespace BlueLaminate.Cli.Commands;

/// <summary>
/// <c>sweep-catalog</c>: catalogue-driven sweep querying each catalogue skin's
/// listings by def_index+paint_index. Presentation over
/// <see cref="ListingSweepService.SweepCatalogAsync"/>.
/// </summary>
internal static class SweepCatalogCommand
{
    public static Command Build(IHost host)
    {
        var command = new Command(
            "sweep-catalog",
            "Catalogue-driven sweep: query each catalogue skin's listings by def_index+paint_index, "
            + "split by wear band (min_float/max_float), so only weapons are fetched (no "
            + "stickers/cases/agents) and each wear band is an independent checkpoint. Each band is "
            + "paged to completion, so Removed-tracking is accurate. Runs continuously (looping the "
            + "catalogue, never-swept/stalest bands first) until Ctrl+C; paces off rate-limit headers. "
            + "Reads CSFLOAT_API_KEY.");

        command.SetAction((parseResult, ct) => RunAsync(host, ct));

        return command;
    }

    private static async Task<int> RunAsync(IHost host, CancellationToken ct)
    {
        using var scope = host.Services.CreateScope();
        CsFloatListingsClient? client = null;

        try
        {
            var service = scope.ServiceProvider.GetRequiredService<ListingSweepService>();
            client = scope.ServiceProvider.GetRequiredService<CsFloatListingsClient>();

            Console.WriteLine("Catalogue sweep (weapons only). Running until Ctrl+C…");

            var r = await service.SweepCatalogAsync(ct: ct);

            Console.WriteLine();
            Console.WriteLine($"Catalogue sweep {r.StoppedReason}:");
            Console.WriteLine($"  Wear-bands    : {r.SkinsCovered}");
            Console.WriteLine($"  Pages fetched : {r.Pages}");
            Console.WriteLine($"  Listings seen : {r.Seen}");
            Console.WriteLine($"  Inserted      : {r.Inserted}");
            Console.WriteLine($"  Updated       : {r.Updated}");
            Console.WriteLine($"  Removed       : {r.Removed}");
            Console.WriteLine();
            Console.WriteLine(client.LastRateLimit.ToString());
            return 0;
        }
        catch (CsFloatApiException ex)
        {
            Console.Error.WriteLine(ex.Message);
            if (client is not null)
            {
                Console.Error.WriteLine(client.LastRateLimit.ToString());
            }

            return 1;
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine($"Catalogue sweep failed: {ex.Message}");
            return 1;
        }
    }
}