using CommandLine;
using Newtonsoft.Json;
using System.Text;

namespace MinecraftDiscordBot;

[Verb("config", HelpText = "Manually configure the bot with CLI arguments.")]
public class BotConfiguration : IBotConfiguration, IBotConfigurator {
    private const string DEFAULT_PREFIX = "!";
    private const int DEFAULT_PORT = 8080;
    [JsonProperty("token", Required = Required.Always)]
    [Option('t', "token", HelpText = "The Discord bot token", Required = true)]
    public string Token { get; init; } = default!;
    [JsonProperty("port", Required = Required.DisallowNull)]
    [Option('p', "port", Default = DEFAULT_PORT, HelpText = "The websocket server port")]
    public int Port { get; init; } = DEFAULT_PORT;
    [JsonProperty("channels", Required = Required.Always)]
    [Option('c', "channel", HelpText = "The list of whitelisted channels", Required = true, Min = 1)]
    public IEnumerable<ulong> Channels { get; init; } = default!;
    [JsonProperty("prefix", Required = Required.DisallowNull)]
    [Option("prefix", Default = DEFAULT_PREFIX, HelpText = "The Discord bot command prefix")]
    public string Prefix { get; init; } = DEFAULT_PREFIX;
    [JsonIgnore]
    public BotConfiguration Config => this;
}

public interface IBotConfigurator {
    BotConfiguration Config { get; }
}

public interface IBotConfiguration {
    string Token { get; }
    int Port { get; }
    IEnumerable<ulong> Channels { get; }
    string Prefix { get; }
}

[Verb("file", true, HelpText = "Load a bot configuration file.")]
public class ConfigFile : IBotConfigurator {
    private const string DEFAULT_CONFIGPATH = "config.json";
    [Option('f', "file", Default = DEFAULT_CONFIGPATH, HelpText = "The path of the configuration file")]
    public string ConfigPath { get; set; } = DEFAULT_CONFIGPATH;
    public BotConfiguration Config
        => JsonConvert.DeserializeObject<BotConfiguration>(File.ReadAllText(ConfigPath, Encoding.UTF8))
        ?? throw new InvalidProgramException("Invalid empty config file!");
}