using BlueLaminate.Scraper.CsMoney;
using BlueLaminate.Scraper.Proxies;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;
using System.CommandLine;

namespace BlueLaminate.Cli.Commands;

/// <summary>
/// <c>capture-csmoney</c>: open the cs.money market through the IPRoyal residential
/// proxy (local forwarding hop, no CDP) in a real, non-headless browser. You clear
/// the Cloudflare challenge once; the tool then pages the listings API from inside
/// the cleared page with human-like pacing, dumping each page's JSON and reporting
/// how many pages survive before a re-challenge. Discovery/measurement tool — writes
/// nothing to the database. Reads IPROYAL_USERNAME / IPROYAL_PASSWORD.
/// </summary>
internal static class CaptureCsMoneyCommand
{
    public static Command Build(IHost host)
    {
        var countryOption = new Option<string?>("--country")
        {
            Description = "ISO country code(s) for the exit IP, e.g. \"us\". Default: configured/random.",
        };
        var loadImagesOption = new Option<bool>("--load-images")
        {
            Description = "Load images (uses more bandwidth). Default off to conserve the metered plan.",
        };
        var pagesOption = new Option<int>("--pages")
        {
            Description = "Maximum offset pages (60 items each) to fetch before stopping.",
            DefaultValueFactory = _ => 50,
        };
        var noProxyOption = new Option<bool>("--no-proxy")
        {
            Description = "Diagnostic: drive the browser on this machine's own IP (no IPRoyal proxy), "
                + "to isolate whether re-challenges are IP reputation vs. the webdriver fingerprint.",
        };
        var outOption = new Option<string>("--out")
        {
            Description = "Directory to write captured JSON pages to.",
            DefaultValueFactory = _ => "csmoney-captures",
        };

        var command = new Command(
            "capture-csmoney",
            "Open the cs.money market through the residential proxy, clear Cloudflare once, then page "
            + "the listings API with pacing and report how many pages survive. Discovery/measurement "
            + "tool — writes nothing to the database. Reads IPROYAL_USERNAME / IPROYAL_PASSWORD.")
        {
            countryOption,
            loadImagesOption,
            pagesOption,
            outOption,
            noProxyOption,
        };

        command.SetAction((parseResult, ct) => RunAsync(
            host,
            parseResult.GetValue(countryOption),
            parseResult.GetValue(loadImagesOption),
            parseResult.GetValue(pagesOption),
            parseResult.GetValue(outOption)!,
            parseResult.GetValue(noProxyOption),
            ct));

        return command;
    }

    private static async Task<int> RunAsync(
        IHost host, string? country, bool loadImages, int pages, string outDir, bool noProxy,
        CancellationToken ct)
    {
        using var scope = host.Services.CreateScope();
        var options = scope.ServiceProvider.GetRequiredService<IOptions<CsMoneyOptions>>().Value;

        var exitCountry = string.IsNullOrWhiteSpace(country) ? options.Country : country;
        var images = loadImages || options.LoadImages;

        Console.WriteLine($"Opening {options.MarketUrl}{(noProxy ? " (DIRECT — no proxy)" : "")}");
        Console.WriteLine(
            "Solve any Cloudflare challenge in the window and wait until the market grid "
            + "(items + prices) is actually visible — that means the session is cleared.");
        Console.WriteLine(
            $"Press Enter here once it's visible. The tool then pages up to {pages} page(s) of "
            + "listings from inside the cleared page and reports how far it gets.");

        try
        {
            var capture = scope.ServiceProvider.GetRequiredService<CsMoneyCaptureService>();

            // Block until the operator presses Enter; the browser stays open the whole
            // time. ReadLine is sync, so push it off-thread.
            var result = await capture.RunAsync(
                outDir,
                new ProxyRequest(Country: exitCountry, Sticky: true),
                images,
                useProxy: !noProxy,
                pages,
                () => Task.Run(() => Console.ReadLine(), ct),
                ct);

            var full = Path.GetFullPath(outDir);
            Console.WriteLine();
            Console.WriteLine(
                $"Stopped: {result.StoppedReason}. {result.PagesSucceeded} page(s), "
                + $"{result.ItemsTotal} item(s) → {full}");
            return result.PagesSucceeded > 0 ? 0 : 1;
        }
        catch (OperationCanceledException)
        {
            Console.Error.WriteLine("Capture cancelled.");
            return 130;
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine($"cs.money capture failed: {ex.Message}");
            return 1;
        }
    }
}