using BlueLaminate.Core.Skins;
using BlueLaminate.Scraper.Skins;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System.CommandLine;

namespace BlueLaminate.Cli.Commands;

/// <summary>
/// <c>sync-skins</c>: load the CS2 skin catalogue and upsert it (throttled monthly).
/// Presentation over <see cref="SkinSyncService.SyncAsync"/>; <c>--dry-run</c>
/// loads and prints via <see cref="SkinCatalogClient"/> without touching the DB.
/// </summary>
internal static class SyncSkinsCommand
{
    public static Command Build(IHost host)
    {
        var forceOption = new Option<bool>("--force")
        {
            Description = "Ignore the once-a-month throttle and sync now."
        };
        var dryRunOption = new Option<bool>("--dry-run")
        {
            Description = "Load and print the skins without writing to the database."
        };

        var command = new Command(
            "sync-skins",
            "Load the CS2 skin catalogue from the CSGO-API dataset and upsert it (throttled to once a month).")
        {
            forceOption,
            dryRunOption,
        };

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

        return command;
    }

    private static async Task<int> RunAsync(IHost host, bool force, bool dryRun, CancellationToken ct)
    {
        using var scope = host.Services.CreateScope();

        if (dryRun)
        {
            return await DryRunAsync(scope.ServiceProvider, ct);
        }

        var service = scope.ServiceProvider.GetRequiredService<SkinSyncService>();
        var result = await service.SyncAsync(force, ct);

        if (result.Skipped)
        {
            Console.WriteLine(
                $"Skipped: skins were last synced {result.LastRanAt:u}. "
                + "Next run allowed one month later — pass --force to override.");
        }
        else
        {
            Console.WriteLine(
                $"Synced {result.Loaded} skins: {result.Inserted} inserted, "
                + $"{result.Updated} updated, "
                + $"{result.Loaded - result.Inserted - result.Updated} unchanged "
                + $"({result.WeaponsCreated} weapons, {result.CollectionsCreated} collections created).");
        }

        return 0;
    }

    // Loads the catalogue and prints it without a database — no service involved.
    private static async Task<int> DryRunAsync(IServiceProvider sp, CancellationToken ct)
    {
        var logger = sp.GetRequiredService<ILoggerFactory>().CreateLogger("BlueLaminate.Cli.SyncSkins");
        var client = sp.GetRequiredService<SkinCatalogClient>();

        logger.LogInformation("Loading skin catalogue (dry run — nothing will be written).");
        var skins = await client.FetchAsync(ct);
        logger.LogInformation("Loaded {Count} skins.", skins.Count);

        Console.WriteLine($"Loaded {skins.Count} skins (dry run, nothing written):");
        foreach (var s in skins)
        {
            var tags = (s.StatTrakAvailable ? " ST" : "") + (s.SouvenirAvailable ? " SV" : "");
            var range = s.FloatMin is not null ? $"{s.FloatMin:0.00}-{s.FloatMax:0.00}" : "—";
            var sources = s.Sources.Count > 0 ? string.Join(", ", s.Sources.Select(x => x.Name)) : "—";
            var idx = $"{s.DefIndex?.ToString() ?? "—"}/{s.PaintIndex?.ToString() ?? "—"}";
            Console.WriteLine(
                $"  {idx,-10} {s.WeaponName,-16} {s.Name,-24} {s.Rarity,-14} {range,-10} {sources}{tags}");
        }

        return 0;
    }
}