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-listings</c>: global incremental sweep of active CSFloat listings into
/// the database. Presentation over <see cref="ListingSweepService.SweepAsync"/>.
/// </summary>
internal static class SweepListingsCommand
{
    public static Command Build(IHost host)
    {
        var maxRequestsOption = new Option<int>("--max-requests")
        {
            Description = "Hard cap on API pages this run (rate-limit budget; 200/window).",
            DefaultValueFactory = _ => 4,
        };
        var maxIngestOption = new Option<int>("--max-listings")
        {
            Description = "Hard cap on listings ingested this run.",
            DefaultValueFactory = _ => 200,
        };
        var fullOption = new Option<bool>("--full")
        {
            Description = "Cold full pass: keep paging past already-seen listings (default is "
                + "incremental — stop once caught up)."
        };

        var command = new Command(
            "sweep-listings",
            "Global incremental sweep of active CSFloat listings into the database. Pages most_recent, "
            + "upserts by listing id, paces off rate-limit headers. Reads CSFLOAT_API_KEY.")
        {
            maxRequestsOption,
            maxIngestOption,
            fullOption,
        };

        command.SetAction((parseResult, ct) => RunAsync(
            host,
            parseResult.GetValue(maxRequestsOption),
            parseResult.GetValue(maxIngestOption),
            parseResult.GetValue(fullOption),
            ct));

        return command;
    }

    private static async Task<int> RunAsync(
        IHost host, int maxRequests, int maxListings, bool full, 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(
                $"Sweeping listings ({(full ? "full cold pass" : "incremental")}; "
                + $"max {maxRequests} requests, {maxListings} listings)…");

            var r = await service.SweepAsync(
                maxRequests: maxRequests,
                maxListings: maxListings,
                incremental: !full,
                ct: ct);

            Console.WriteLine();
            Console.WriteLine($"Sweep complete ({r.StoppedReason}):");
            Console.WriteLine($"  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($"  Catalog-linked: {r.Linked}");
            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($"Sweep failed: {ex.Message}");
            return 1;
        }
    }
}