using System.Text.Json;
using System.Text.RegularExpressions;
using DSharpPlus.Entities;
using DSharpPlus.SlashCommands;

namespace CollabBot;

public class DiscordCommands : ApplicationCommandModule
{
    [SlashCommand("vnc", "View insecure VNCs around the world!")]
    public async Task VNC(InteractionContext ctx,
        [Option("country", "If specified, a random VNC from this country")] string? country = null)
    {
        await ctx.DeferAsync();
        VNC vnc;
        using var http = new HttpClient();
        if (country != null)
        {
            if (!Regex.IsMatch(country, "^[a-zA-Z]{2}$"))
            {
                await ctx.EditResponseAsync(new DiscordWebhookBuilder().WithContent(
                    "Country name must be ISO code (i.e. GB for England, US for United States)"));
                return;
            }
            var response =
                await http.GetStringAsync(
                    $"https://computernewb.com/vncresolver/api/scans/vnc/search?country={country}");
            var results = JsonSerializer.Deserialize<VNCSearchResult>(response);
            if (results == null || results.error != null)
            {
                await ctx.EditResponseAsync(new DiscordWebhookBuilder().WithContent(results != null
                    ? results.error!
                    : "Failed to fetch VNC data (response was null, please ping an admin!)"));
            }
            if (results.count == 0)
            {
                await ctx.EditResponseAsync(new DiscordWebhookBuilder().WithContent(country.ToUpper() == "NK" ? "You wish lol" : "No VNCs from that country found."));
                return;
            }
            var random = new Random().Next(results.count);
            response = await http.GetStringAsync(
                $"https://computernewb.com/vncresolver/api/scans/vnc/id/{results.result[random]}");
            vnc = JsonSerializer.Deserialize<VNC>(response);
        }
        else
        {
            var response = await http.GetStringAsync("https://computernewb.com/vncresolver/api/scans/vnc/random");
            vnc = JsonSerializer.Deserialize<VNC>(response);
        }
        if (vnc == null)
        {
            await ctx.EditResponseAsync(new DiscordWebhookBuilder().WithContent("Failed to fetch VNC data (response was null, please ping an admin!)"));
            return;
        }

        var embed = new DiscordEmbedBuilder()
            .WithTitle($"VNC {vnc.id}").WithUrl($"https://computernewb.com/vncresolver/browse/#id/{vnc.id}")
            .AddField("Address", $"{vnc.ip}:{vnc.port}")
            .AddField("Location", $"{vnc.city}, {vnc.country} :flag_{vnc.country.ToLower()}:")
            .AddField("ASN", vnc.asn)
            .WithImageUrl($"https://computernewb.com/vncresolver/api/scans/vnc/screenshot/{vnc.id}.jpeg")
            .WithFooter($"Added to database on {vnc.createdat}");
        if (!String.IsNullOrEmpty(vnc.clientname)) embed.AddField("Client", vnc.clientname);
        if (!String.IsNullOrEmpty(vnc.screenres)) embed.AddField("Screen Resolution", vnc.screenres);
        if (!String.IsNullOrEmpty(vnc.hostname)) embed.AddField("Hostname", vnc.hostname);
        await ctx.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(embed));
    }

    [SlashCommand("report", "Report a user for breaking the rules on the main VMs")]
    public async Task ReportUser(InteractionContext ctx,
        [Option("user", "Who is breaking the rules?")]
        string user,
        [Option("vm", "Which VM are they on?"), ChoiceProvider(typeof(VMChoiceProvider))]
        string vm,
        [Option("rule", "Which rule are they breaking?"), ChoiceProvider(typeof(RulesChoiceProvider))]
        string rule,
        [Option("reason", "What exactly are they doing?")]
        string reason
    )
    {
        await ctx.DeferAsync(true);
        await Program.ReportChannel.SendMessageAsync($"<@&{Program.Config.ReportRole}>", new DiscordEmbedBuilder()
            .WithTitle("User Reported")
            .AddField("User", user)
            .AddField("VM", vm)
            .AddField("Rule", rule)
            .AddField("Reason", reason)
            .AddField("Reporter", $"{ctx.User.Mention} ({ctx.User.Username})")
            .Build());
        await ctx.EditResponseAsync(new DiscordWebhookBuilder().WithContent("Thank you for your report!"));
    }
}

public abstract class DictChoiceProvider : ChoiceProvider
{
    public abstract Dictionary<string,string> Options { get; }

    public override Task<IEnumerable<DiscordApplicationCommandOptionChoice>> Provider()
    {
        return Task.FromResult(Options.Select(o => new DiscordApplicationCommandOptionChoice(o.Key, o.Value)));
    }
}

public class RulesChoiceProvider : DictChoiceProvider
{
    public override Dictionary<string, string> Options => new()
    {
        { "R1. Don't break the law.", "R1" },
        { "R2. No running DoS/DDoS tools.", "R2"},
        { "R3. No spam distribution.", "R3"},
        { "R4. Do not abuse any exploits.", "R4" },
        { "R6. One vote per person.", "R6" },
        { "R7. No Remote Administration Tools.", "R7" },
        { "R8. No bypassing CollabNet.", "R8" },
        { "R9. No performing destructive actions constantly.", "R9" },
        { "R10. No Cryptomining", "R10" },
        { "NSFW Content on Main VMs", "NSFW" }
    };
}

public class VMChoiceProvider : DictChoiceProvider
{
    public override Dictionary<string, string> Options => new()
    {
        { "VM0b0t", "VM0b0t" },
        { "VM1", "VM1" },
        { "VM2", "VM2" },
        { "VM3", "VM3" },
        { "VM4", "VM4" },
        { "VM5", "VM5" },
        { "VM6", "VM6" },
        { "VM7", "VM7" },
        { "VM8", "VM8" }
    };
}