using System;
using Dalamud.Game.ClientState.Conditions;
using Dalamud.IoC;
using Dalamud.Plugin;
using Dalamud.Plugin.Services;
using FFXIVClientStructs.FFXIV.Client.System.String;
using FFXIVClientStructs.FFXIV.Client.UI;

namespace AutoFishingStool;

public sealed unsafe class Plugin : IDalamudPlugin
{
    private const int SitDelayMilliseconds = 2500;
    private const int ActionSettleMilliseconds = 500;
    private const uint FisherClassJobId = 18;

    [PluginService]
    internal static ICondition Condition { get; private set; } = null!;

    [PluginService]
    internal static IFramework Framework { get; private set; } = null!;

    [PluginService]
    internal static IPlayerState PlayerState { get; private set; } = null!;

    [PluginService]
    internal static IPluginLog Log { get; private set; } = null!;

    private DateTime? sitAt;
    private bool satThisSession;
    private bool waitingForActionToFinish;

    public Plugin()
    {
        Condition.ConditionChange += OnConditionChange;
        Framework.Update += OnFrameworkUpdate;
        Log.Information("Auto Fishing Stool loaded");
    }

    private void OnConditionChange(ConditionFlag flag, bool value)
    {
        if (flag == ConditionFlag.Fishing)
        {
            Log.Information("Fishing condition changed to {Value}", value);

            if (value && Condition[ConditionFlag.Gathering] && IsFisher() && !satThisSession)
            {
                sitAt = DateTime.UtcNow.AddMilliseconds(SitDelayMilliseconds);
                waitingForActionToFinish = false;
                Log.Information("Fishing became active; stable Sit timer started");
            }
            else if (!value && !satThisSession)
            {
                sitAt = null;
                waitingForActionToFinish = false;
                Log.Information("Fishing became inactive; stable Sit timer reset");
            }

            return;
        }

        if (flag != ConditionFlag.Gathering)
            return;

        Log.Information("Gathering condition changed to {Value}", value);

        if (value)
        {
            if (!IsFisher())
                return;

            satThisSession = false;
            sitAt = null;
            waitingForActionToFinish = false;
            Log.Information("Fisher gathering session started");
            return;
        }

        sitAt = null;
        satThisSession = false;
        waitingForActionToFinish = false;
    }

    private void OnFrameworkUpdate(IFramework framework)
    {
        if (satThisSession || sitAt is null)
            return;

        if (!Condition[ConditionFlag.Gathering] || !Condition[ConditionFlag.Fishing] || !IsFisher())
        {
            sitAt = null;
            satThisSession = false;
            waitingForActionToFinish = false;
            return;
        }

        if (DateTime.UtcNow < sitAt.Value)
            return;

        if (Condition[ConditionFlag.ExecutingGatheringAction])
        {
            if (!waitingForActionToFinish)
            {
                waitingForActionToFinish = true;
                Log.Information("Sit timer elapsed during a fishing action; waiting for it to finish");
            }

            return;
        }

        if (waitingForActionToFinish)
        {
            waitingForActionToFinish = false;
            sitAt = DateTime.UtcNow.AddMilliseconds(ActionSettleMilliseconds);
            Log.Information("Fishing action finished; Sit command scheduled after settling");
            return;
        }

        var uiModule = UIModule.Instance();
        if (uiModule is null)
        {
            Log.Warning("Could not access the game's UI module");
            sitAt = null;
            return;
        }

        var command = Utf8String.FromString("/sit");
        try
        {
            uiModule->ProcessChatBoxEntry(command);
            Log.Information("Submitted /sit after fishing started");
        }
        finally
        {
            command->Dtor(true);
        }
        satThisSession = true;
        sitAt = null;
        waitingForActionToFinish = false;
    }

    private static bool IsFisher()
    {
        return PlayerState.IsLoaded && PlayerState.ClassJob.RowId == FisherClassJobId;
    }

    public void Dispose()
    {
        Condition.ConditionChange -= OnConditionChange;
        Framework.Update -= OnFrameworkUpdate;
    }
}