using System;
using Godot;

namespace SideScrollerGame.Debug;

public sealed class DebugSettings
{
    public DebugSettings(DebugBootMode bootMode, int seed)
    {
        BootMode = bootMode;
        Seed = seed;
    }

    public static DebugSettings Load()
    {
        DebugBootMode bootMode = LoadBootModeFromProjectSettings();
        int seed = LoadSeedFromProjectSettings();

        foreach (string argument in OS.GetCmdlineUserArgs())
        {
            if (argument.StartsWith(DebugBootModePrefix, StringComparison.OrdinalIgnoreCase))
            {
                string value = argument[DebugBootModePrefix.Length..];
                if (TryParseBootMode(value, out DebugBootMode parsedBootMode))
                {
                    bootMode = parsedBootMode;
                }
                else
                {
                    GD.PushWarning($"Unknown debug boot mode '{value}'. Falling back to Menu.");
                    bootMode = DebugBootMode.Menu;
                }
            }
            else if (argument.StartsWith(SeedPrefix, StringComparison.OrdinalIgnoreCase))
            {
                string value = argument[SeedPrefix.Length..];
                if (int.TryParse(value, out int parsedSeed))
                {
                    seed = parsedSeed;
                }
                else
                {
                    GD.PushWarning($"Unknown debug seed '{value}'. Keeping seed {seed}.");
                }
            }
        }

        return new DebugSettings(bootMode, seed);
    }

    public DebugBootMode BootMode { get; }

    public int Seed { get; }

    private static DebugBootMode LoadBootModeFromProjectSettings()
    {
        if (!ProjectSettings.HasSetting(DebugBootModeSetting))
        {
            return DebugBootMode.Menu;
        }

        string configuredBootMode = ProjectSettings.GetSetting(DebugBootModeSetting).AsString();
        if (TryParseBootMode(configuredBootMode, out DebugBootMode bootMode))
        {
            return bootMode;
        }

        GD.PushWarning($"Unknown configured debug boot mode '{configuredBootMode}'. Falling back to Menu.");
        return DebugBootMode.Menu;
    }

    private static int LoadSeedFromProjectSettings()
    {
        if (!ProjectSettings.HasSetting(DebugSeedSetting))
        {
            return 1;
        }

        return ProjectSettings.GetSetting(DebugSeedSetting).AsInt32();
    }

    private static bool TryParseBootMode(string value, out DebugBootMode bootMode)
    {
        return Enum.TryParse(value, true, out bootMode);
    }

    private const string DebugBootModePrefix = "--debug-boot=";
    private const string DebugBootModeSetting = "application/run/debug_boot_mode";
    private const string DebugSeedSetting = "application/run/debug_seed";
    private const string SeedPrefix = "--seed=";
}