@using System.Collections.Specialized
@using RackPeek.Domain.Persistence
@using RackPeek.Domain.Persistence.Yaml
@using RackPeek.Domain.Resources
@using RackPeek.Domain.Resources.AccessPoints
@using RackPeek.Domain.Resources.Desktops
@using RackPeek.Domain.Resources.Firewalls
@using RackPeek.Domain.Resources.Laptops
@using RackPeek.Domain.Resources.Servers
@using RackPeek.Domain.Resources.Switches
@using RackPeek.Domain.Resources.SystemResources
@using YamlDotNet.Serialization
@using YamlDotNet.Serialization.NamingConventions
@using Router = RackPeek.Domain.Resources.Routers.Router
@inject ITextFileStore FileStore
@inject IResourceCollection Resources

<div class="border border-zinc-800 rounded p-4 bg-zinc-900">
    <div class="flex justify-between items-center mb-3">

        <div class="text-zinc-100">
            @Title
        </div>

        <div class="flex gap-3 text-xs">
            @if (!_isEditing)
            {
                <button class="text-zinc-400 hover:text-zinc-200"
                        @onclick="BeginEdit">
                    Edit
                </button>
            }
            else
            {
                <button class="text-emerald-400 hover:text-emerald-300"
                        @onclick="Save">
                    Save
                </button>

                <button class="text-zinc-500 hover:text-zinc-300"
                        @onclick="Cancel">
                    Cancel
                </button>
            }
        </div>
    </div>

    @if (!_exists)
    {
        <div class="text-red-400 text-sm">
            File does not exist.
        </div>
    }
    else if (_isEditing)
    {
        <textarea class="w-full input font-mono text-xs"
                  style="min-height: 40rem"
                  @bind="_editText">
        </textarea>


        @if (!string.IsNullOrEmpty(_validationError))
        {
            <div class="mt-2 text-red-400 text-xs">
                @_validationError
            </div>
        }
    }
    else
    {
        <pre class="text-zinc-300 text-xs whitespace-pre-wrap">@_currentText</pre>
    }
</div>

<ConfirmModal
    IsOpen="_confirmDeleteOpen"
    IsOpenChanged="v => _confirmDeleteOpen = v"
    Title="Delete File"
    ConfirmText="Delete"
    ConfirmClass="bg-red-600 hover:bg-red-500"
    OnConfirm="DeleteFile"
    TestIdPrefix="File">>
    Are you sure you want to delete <strong>@Path</strong>?
</ConfirmModal>

@code {

    [Parameter] [EditorRequired] public string Path { get; set; } = default!;

    [Parameter] public string Title { get; set; } = "Edit YAML";

    [Parameter] public EventCallback<string> OnDeleted { get; set; }

    bool _isEditing;
    bool _exists;
    bool _confirmDeleteOpen;

    string _currentText = "";
    string _editText = "";
    string? _validationError;

    protected override async Task OnParametersSetAsync()
    {
        await Load();
    }

    async Task Load()
    {
        _exists = await FileStore.ExistsAsync(Path);

        if (!_exists)
            return;

        _currentText = await FileStore.ReadAllTextAsync(Path);
    }

    void BeginEdit()
    {
        _editText = _currentText;
        _validationError = null;
        _isEditing = true;
    }

    void Cancel()
    {
        _isEditing = false;
        _validationError = null;
    }

    async Task Save()
    {
        if (!ValidateYamlRoundTrip(_editText, out var error))
        {
            _validationError = error;
            return;
        }

        await FileStore.WriteAllTextAsync(Path, _editText);

        await Resources.LoadAsync();

        _currentText = _editText;
        _isEditing = false;
    }


    void ConfirmDelete()
    {
        _confirmDeleteOpen = true;
    }

    async Task DeleteFile()
    {
        _confirmDeleteOpen = false;

        // if your store supports delete, call it here
        await FileStore.WriteAllTextAsync(Path, "");

        if (OnDeleted.HasDelegate)
            await OnDeleted.InvokeAsync(Path);
    }

    private bool ValidateYamlRoundTrip(string yaml, out string? error)
    {
        try
        {
            if (string.IsNullOrWhiteSpace(yaml))
            {
                error = "YAML is empty.";
                return false;
            }

            // ---------- DESERIALIZER (same as resource loader) ----------
            var deserializer = new DeserializerBuilder()
                .WithNamingConvention(CamelCaseNamingConvention.Instance)
                .WithCaseInsensitivePropertyMatching()
                .WithTypeConverter(new StorageSizeYamlConverter())
                .WithTypeDiscriminatingNodeDeserializer(options =>
                {
                    options.AddKeyValueTypeDiscriminator<Resource>("kind", new Dictionary<string, Type>
                    {
                        { Server.KindLabel, typeof(Server) },
                        { Switch.KindLabel, typeof(Switch) },
                        { Firewall.KindLabel, typeof(Firewall) },
                        { Router.KindLabel, typeof(Router) },
                        { Desktop.KindLabel, typeof(Desktop) },
                        { Laptop.KindLabel, typeof(Laptop) },
                        { AccessPoint.KindLabel, typeof(AccessPoint) },
                        { RackPeek.Domain.Resources.UpsUnits.Ups.KindLabel, typeof(RackPeek.Domain.Resources.UpsUnits.Ups) },
                        { SystemResource.KindLabel, typeof(SystemResource) },
                        { Service.KindLabel, typeof(Service) }
                    });
                })
                .Build();

            var root = deserializer.Deserialize<YamlRoot>(yaml);

            if (root?.Resources == null)
            {
                error = "No resources section found.";
                return false;
            }

            // ---------- SERIALIZE AGAIN ----------
            var serializer = new SerializerBuilder()
                .WithNamingConvention(CamelCaseNamingConvention.Instance)
                .Build();

            var payload = new OrderedDictionary
            {
                ["resources"] = root.Resources
            };

            var roundTripYaml = serializer.Serialize(payload);

            // ---------- DESERIALIZE AGAIN ----------
            var root2 = deserializer.Deserialize<YamlRoot>(roundTripYaml);

            if (root2?.Resources == null)
            {
                error = "Round-trip serialization failed.";
                return false;
            }

            // ---------- DUPLICATE NAME CHECK ----------
            var dup = root2.Resources
                .GroupBy(r => r.Name, StringComparer.OrdinalIgnoreCase)
                .FirstOrDefault(g => g.Count() > 1);

            if (dup != null)
            {
                error = $"Duplicate resource name: '{dup.Key}'";
                return false;
            }

            error = null;
            return true;
        }
        catch (Exception ex)
        {
            error = $"YAML validation failed: {ex.Message}";
            return false;
        }
    }

}