@using RackPeek.Domain.Git
@using RackPeek.Domain.Git.UseCases
@using RackPeek.Domain.Persistence
@inject InitRepoUseCase InitRepo
@inject CommitAllUseCase CommitAll
@inject RestoreAllUseCase RestoreAll
@inject PushUseCase PushUseCase
@inject PullUseCase PullUseCase
@inject AddRemoteUseCase AddRemoteUseCase
@inject IGitRepository GitRepo
@inject IResourceCollection Resources
@implements IDisposable

<div class="flex items-center gap-3 text-xs">

    @if (_status == GitRepoStatus.Clean)
    {
        <span class="flex items-center gap-1 text-zinc-400">
            <span class="w-2 h-2 rounded-full bg-emerald-400"></span>
            Saved
        </span>
    }
    else if (_status == GitRepoStatus.Dirty)
    {
        <span class="flex items-center gap-1 text-zinc-400">
            <span class="w-2 h-2 rounded-full bg-amber-400 animate-pulse"></span>
        </span>

        <span class="text-zinc-600">·</span>

        <button class="hover:text-emerald-400"
                disabled="@_isBusy"
                @onclick="CommitAsync">
            @(_isCommitting ? "Saving…" : "Save")
        </button>

        <span class="text-zinc-600">·</span>

        <button class="hover:text-red-400"
                disabled="@_isBusy"
                @onclick="DiscardAsync">
            @(_isRestoring ? "Discarding…" : "Discard")
        </button>
    }

    @if (!_hasRemote)
    {
        <span class="text-zinc-600">·</span>

        @if (_showAddRemote)
        {
            <input type="text"
                   class="px-2 py-1 text-xs rounded bg-zinc-800 border border-zinc-700 text-zinc-200 w-56"
                   placeholder="https://github.com/user/repo.git"
                   @bind="_remoteUrl"
                   @bind:event="oninput" />

            <button class="hover:text-emerald-400"
                    disabled="@(string.IsNullOrWhiteSpace(_remoteUrl))"
                    @onclick="AddRemoteAsync">
                Add
            </button>

            <button class="hover:text-zinc-400"
                    @onclick="CancelAddRemote">
                Cancel
            </button>
        }
        else
        {
            <button class="text-zinc-400 hover:text-emerald-400"
                    @onclick="() => _showAddRemote = true">
                Add Remote
            </button>
        }
    }
    else
    {
        <span class="text-zinc-600">·</span>

        <button class="text-zinc-400 hover:text-white"
                disabled="@(_isSyncing || _isFetching)"
                @onclick="ToggleSyncAsync">

            @if (_isFetching)
            {
                <span>Checking…</span>
            }
            else
            {
                <span>
                    Sync
                    @if (_syncStatus.Ahead > 0)
                    {
                        <span class="text-emerald-400"> ↑@_syncStatus.Ahead</span>
                    }
                    @if (_syncStatus.Behind > 0)
                    {
                        <span class="text-blue-400"> ↓@_syncStatus.Behind</span>
                    }
                </span>
            }
        </button>

        @if (_syncStatus.Ahead > 0)
        {
            <span class="text-zinc-600">·</span>

            <button class="hover:text-emerald-400"
                    disabled="@_isSyncing"
                    @onclick="PushAsync">
                @(_isPushing ? "Pushing…" : "Push")
            </button>
        }

        @if (_syncStatus.Behind > 0)
        {
            <span class="text-zinc-600">·</span>

            <button class="hover:text-blue-400"
                    disabled="@_isSyncing"
                    @onclick="PullAsync">
                @(_isPulling ? "Pulling…" : "Pull")
            </button>
        }
    }

    @if (_errorMessage is not null)
    {
        <span class="text-red-400">@_errorMessage</span>
    }
</div>

@code {

    private GitRepoStatus _status = GitRepoStatus.NotAvailable;

    private bool _isCommitting;
    private bool _isRestoring;
    private bool _showAddRemote;
    private bool _hasRemote;

    private bool _isFetching;
    private bool _isPushing;
    private bool _isPulling;

    private string? _errorMessage;
    private string _remoteUrl = "";

    private PeriodicTimer? _timer;
    private CancellationTokenSource? _cts;

    private GitSyncStatus _syncStatus = new(0, 0, false);

    private bool _isBusy => _isCommitting || _isRestoring || _isSyncing;
    private bool _isSyncing => _isPushing || _isPulling || _isFetching;

    protected override async Task OnInitializedAsync()
    {
        _status = await Task.Run(() => GitRepo.GetStatus());

        if (_status == GitRepoStatus.NotAvailable)
            return;

        _hasRemote = await Task.Run(() => GitRepo.HasRemote());

        _cts = new CancellationTokenSource();
        _timer = new PeriodicTimer(TimeSpan.FromSeconds(15));

        _ = PollStatusAsync(_cts.Token);
    }

    private async Task PollStatusAsync(CancellationToken ct)
    {
        try
        {
            while (_timer != null && await _timer.WaitForNextTickAsync(ct))
            {
                if (_isBusy)
                    continue;

                var newStatus = await Task.Run(() => GitRepo.GetStatus(), ct);

                if (newStatus != _status)
                {
                    _status = newStatus;
                    await InvokeAsync(StateHasChanged);
                }
            }
        }
        catch (OperationCanceledException) {}
    }

    private void CancelAddRemote()
    {
        _showAddRemote = false;
        _remoteUrl = "";
    }

    private async Task AddRemoteAsync()
    {
        _errorMessage = null;

        try
        {
            var error = await AddRemoteUseCase.ExecuteAsync(_remoteUrl);

            if (error != null)
            {
                _errorMessage = error;
                return;
            }

            _hasRemote = true;
            _showAddRemote = false;
            _remoteUrl = "";

            _syncStatus = await Task.Run(() => GitRepo.FetchAndGetSyncStatus());

            if (_syncStatus.Behind > 0)
                await PullAsync();
        }
        catch (Exception ex)
        {
            _errorMessage = $"Remote error: {ex.Message}";
        }
    }

    private async Task CommitAsync()
    {
        _errorMessage = null;
        _isCommitting = true;

        try
        {
            var error = await CommitAll.ExecuteAsync(
                $"rackpeek: save config {DateTime.UtcNow:yyyy-MM-dd HH:mm:ss} UTC");

            if (error != null)
                _errorMessage = error;

            _status = await Task.Run(() => GitRepo.GetStatus());

            await Resources.LoadAsync();
        }
        catch (Exception ex)
        {
            _errorMessage = $"Commit error: {ex.Message}";
        }
        finally
        {
            _isCommitting = false;
        }
    }

    private async Task ToggleSyncAsync()
    {
        _isFetching = true;

        try
        {
            _syncStatus = await Task.Run(() => GitRepo.FetchAndGetSyncStatus());
        }
        finally
        {
            _isFetching = false;
        }
    }

    private async Task PushAsync()
    {
        _errorMessage = null;
        _isPushing = true;

        try
        {
            var error = await PushUseCase.ExecuteAsync();

            if (error != null)
                _errorMessage = error;

            _syncStatus = await Task.Run(() => GitRepo.FetchAndGetSyncStatus());
        }
        catch (Exception ex)
        {
            _errorMessage = $"Push error: {ex.Message}";
        }
        finally
        {
            _isPushing = false;
        }
    }

    private async Task PullAsync()
    {
        _errorMessage = null;
        _isPulling = true;

        try
        {
            var error = await PullUseCase.ExecuteAsync();

            if (error != null)
                _errorMessage = error;

            _syncStatus = await Task.Run(() => GitRepo.FetchAndGetSyncStatus());
            _status = await Task.Run(() => GitRepo.GetStatus());

            await Resources.LoadAsync();
        }
        catch (Exception ex)
        {
            _errorMessage = $"Pull error: {ex.Message}";
        }
        finally
        {
            _isPulling = false;
        }
    }

    private async Task DiscardAsync()
    {
        _errorMessage = null;
        _isRestoring = true;

        try
        {
            var error = await RestoreAll.ExecuteAsync();

            if (error != null)
                _errorMessage = error;

            _status = await Task.Run(() => GitRepo.GetStatus());

            await Resources.LoadAsync();
        }
        catch (Exception ex)
        {
            _errorMessage = $"Discard error: {ex.Message}";
        }
        finally
        {
            _isRestoring = false;
        }
    }

    public void Dispose()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _timer?.Dispose();
    }
}