@rendermode InteractiveServer
@implements IDialogContentComponent<EditorDialogData>
@implements IDisposable

@using System.Collections
@using HopFrame.Core.Config
@using HopFrame.Core.Services
@using HopFrame.Web.Models
@using HopFrame.Web.Helpers
@using HopFrame.Web.Plugins
@using HopFrame.Web.Plugins.Events

<FluentDialogBody>
    @foreach (var property in GetEditorProperties()) {
        if (!_currentlyEditing && !property.Creatable) continue;

        <div style="margin-bottom: 20px">
            @if (property.IsRelation) {
                <div style="display: flex; gap: 5px; align-items: flex-end">
                    <div style="flex-grow: 1">
                        @if (property.IsEnumerable) {
                            <FluentLabel Style="margin-bottom: calc(var(--design-unit) * 1px)">@property.Name</FluentLabel>
                            <div class="hopframe-listview">
                                <FluentOverflow Style="width: 100%">
                                    @foreach (var item in GetPropertyValue<IEnumerable>(property) ?? Enumerable.Empty<object>()) {
                                        <FluentOverflowItem><FluentBadge>@(GetPropertyValue<string>(property, item))</FluentBadge></FluentOverflowItem>
                                    }
                                </FluentOverflow>
                            </div>
                        }
                        else {
                            <FluentTextField
                                Label="@property.Name"
                                Value="@(GetPropertyValue<string>(property))"
                                Required="@property.IsRequired"
                                ReadOnly="true"
                                Style="width: 100%" />
                        }
                    </div>
                    <div style="display: flex; gap: 5px; margin-bottom: 4px">
                        @if (!property.IsRequired) {
                            <FluentButton OnClick="async () => await SetPropertyValue(property, null, InputType.Relation)" Disabled="@(_currentlyEditing && !property.Editable)">
                                <FluentIcon Value="@(new Icons.Regular.Size20.Dismiss())" Color="Color.Neutral" />
                            </FluentButton>
                        }
                        <FluentButton OnClick="async () => await OpenRelationalPicker(property)" Disabled="@(_currentlyEditing && !property.Editable)">
                            <FluentIcon Value="@(new Icons.Regular.Size20.Open())" Color="Color.Neutral" />
                        </FluentButton>
                    </div>
                </div>
            }
            else if (property.Info.PropertyType.IsNumeric()) {
                <FluentNumberField
                    TValue="double"
                    Label="@property.Name"
                    Value="GetPropertyValue<double>(property)"
                    Style="width: 100%;"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Number))" />
            }
            else if (Type.GetTypeCode(property.Info.PropertyType) == TypeCode.Boolean) {
                <FluentSwitch
                    Label="@property.Name"
                    Value="GetPropertyValue<bool>(property)"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Switch))" />
            }
            else if (Type.GetTypeCode(property.Info.PropertyType) == TypeCode.DateTime) {
                <div style="display: flex; gap: 5px">
                    <div style="display: flex; flex-direction: column; width: 100%">
                        <FluentDatePicker
                            Label="@property.Name"
                            Value="GetPropertyValue<DateTime>(property)"
                            Disabled="@(_currentlyEditing && !property.Editable)"
                            Required="@property.IsRequired"
                            ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Date))" />
                    </div>
                    <div style="display: flex; flex-direction: column; justify-content: flex-end">
                        <FluentTimePicker
                            Value="GetPropertyValue<DateTime>(property)"
                            Disabled="@(_currentlyEditing && !property.Editable)"
                            Required="@property.IsRequired"
                            ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Time))" />
                    </div>
                </div>
            }
            else if (property.Info.PropertyType == typeof(DateOnly)) {
                <FluentDatePicker
                    Label="@property.Name"
                    Value="GetPropertyValue<DateOnly>(property).ToDateTime(TimeOnly.MinValue)"
                    Style="width: 100%"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Date))" />
            }
            else if (property.Info.PropertyType == typeof(TimeOnly)) {
                <FluentTimePicker
                    Label="@property.Name"
                    Value="GetPropertyValue<TimeOnly>(property).ToDateTime()"
                    Style="width: 100%"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Time))" />
            }
            else if (property.Info.PropertyType.IsEnum) {
                <FluentSelect
                    TOption="string"
                    Label="@property.Name"
                    Items="Enum.GetNames(property.Info.PropertyType)"
                    Value="@(GetPropertyValue<string>(property))"
                    Style="width: 100%"
                    Height="250px"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Enum))" />
            }
            else if (property.Info.PropertyType.IsNullableEnum()) {
                <div style="display: flex; gap: 5px; align-items: flex-end">
                    <div style="flex-grow: 1">
                        <FluentSelect
                            TOption="string"
                            Label="@property.Name"
                            Items="@(["", ..Enum.GetNames(Nullable.GetUnderlyingType(property.Info.PropertyType)!)])"
                            Value="@(GetPropertyValue<string>(property))"
                            Style="width: 100%"
                            Height="250px"
                            Disabled="@(_currentlyEditing && !property.Editable)"
                            Required="@property.IsRequired"
                            ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Enum))" />
                    </div>
                    <div style="display: flex; gap: 5px">
                        <FluentButton OnClick="async () => await SetPropertyValue(property, null, InputType.Enum)" Disabled="@(_currentlyEditing && !property.Editable)">
                            <FluentIcon Value="@(new Icons.Regular.Size20.Dismiss())" Color="Color.Neutral" />
                        </FluentButton>
                    </div>
                </div>
            }
            else if (property.TextArea) {
                <FluentTextArea
                    Label="@property.Name"
                    Value="@(GetPropertyValue<string>(property))"
                    Style="width: 100%;"
                    Rows="@property.TextAreaRows"
                    Resize="TextAreaResize.Vertical"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Text))" />
            }
            else {
                <FluentTextField
                    Label="@property.Name"
                    Value="@(GetPropertyValue<string>(property))"
                    Style="width: 100%;"
                    Disabled="@(_currentlyEditing && !property.Editable)"
                    Required="@property.IsRequired"
                    ValueChanged="@(async v => await SetPropertyValue(property, v, InputType.Text))" />
            }
            
            @foreach (var error in _validationErrors[property.Name]) {
                <FluentLabel Color="@Color.Error">@error</FluentLabel>
            }
        </div>
    }
</FluentDialogBody>

<FluentToastProvider MaxToastCount="10" />

@inject IContextExplorer Explorer
@inject IDialogService Dialogs
@inject IHopFrameAuthHandler Handler
@inject IToastService Toasts
@inject IServiceProvider Provider
@inject IPluginOrchestrator PluginOrchestrator

@code {
    [Parameter]
    public required EditorDialogData Content { get; set; }

    [CascadingParameter]
    public required FluentDialog Dialog { get; set; }

    private bool _currentlyEditing;
    private ITableManager? _manager;
    private readonly Dictionary<string, List<string>> _validationErrors = new();
    private readonly List<PropertyChange> _changes = new();
    private readonly CancellationTokenSource _tokenSource = new();

    protected override void OnInitialized() {
        _currentlyEditing = Content.CurrentObject is not null;
        Dialog.Instance.Parameters.Title = (_currentlyEditing ? "Edit " : "Add ") + Content.Config.TableType.Name;
        Dialog.Instance.Parameters.Width = "500px";
        Dialog.Instance.Parameters.PrimaryAction = "Save";
        Dialog.Instance.Parameters.ValidateDialogAsync = ValidateInputs;
        _manager = Explorer.GetTableManager(Content.Config.PropertyName);
        Content.CurrentObject ??= Activator.CreateInstance(Content.Config.TableType);
        
        foreach (var property in Content.Config.Properties) {
            _validationErrors.Add(property.Name, []);
        }
    }

    private IEnumerable<PropertyConfig> GetEditorProperties() {
        return Content.Config.Properties
            .Where(prop => prop is not VirtualPropertyConfig { VirtualParser: null })
            .OrderBy(prop => prop.Order);
    }

    private TValue? GetPropertyValue<TValue>(PropertyConfig config, object? listItem = null) {
        if (!config.DisplayValue) return default;
        if (Content.CurrentObject is null) return default;

        if (listItem is not null) {
            return (TValue)(object)_manager!.DisplayProperty(Content.CurrentObject, config, null, listItem).Result;
        }

        var value = GetNewestValue(config);

        if (value is null)
            return default;

        if (typeof(TValue).IsAssignableFrom(config.Info.PropertyType))
            return (TValue)value;

        if (typeof(TValue) == typeof(string))
            return (TValue)(object)_manager!.DisplayProperty(Content.CurrentObject, config, value).Result;

        return (TValue)Convert.ChangeType(value, typeof(TValue));
    }

    private async Task SetPropertyValue(PropertyConfig config, object? value, InputType senderType) {
        if (!await Handler.IsAuthenticatedAsync(_currentlyEditing ? Content.Config.UpdatePolicy : Content.Config.CreatePolicy))
            return;
        
        object? result = null;
        var needsOverride = true;

        if (value is not null && config.Parser is null) {
            switch (senderType) {
                case InputType.Number:
                    result = Convert.ChangeType(value, config.Info.PropertyType);
                    break;
                    
                case InputType.Text:
                    if (config.Info.PropertyType == typeof(Guid)) {
                        var success = Guid.TryParse((string)value, out var guid);
                        if (success) result = guid;
                        else Toasts.ShowError($"'{value}' is not a valid guid");
                        break;
                    }
                    
                    result = Convert.ToString(value);
                    break;
                    
                case InputType.Switch:
                    result = Convert.ToBoolean(value);
                    break;
                    
                case InputType.Enum:
                    var type = Nullable.GetUnderlyingType(config.Info.PropertyType);
                    if (type is not null && string.IsNullOrEmpty((string)value)) break;
                    type ??= config.Info.PropertyType;
                    result = Enum.Parse(type, (string)value);
                    break;
                    
                case InputType.Date:
                    if (config.Info.PropertyType == typeof(DateTime)) {
                        var newDate = (DateTime)value;
                        var dateTime = GetPropertyValue<DateTime>(config);
                        result = new DateTime(newDate.Year, newDate.Month, newDate.Day, dateTime.Hour, dateTime.Minute, dateTime.Second, dateTime.Millisecond, dateTime.Microsecond);
                    }
                    else result = DateOnly.FromDateTime((DateTime)value);
                    break;
                    
                case InputType.Time:
                    if (config.Info.PropertyType == typeof(DateTime)) {
                        var newTime = (DateTime)value;
                        var dateTime = GetPropertyValue<DateTime>(config);
                        result = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, newTime.Hour, newTime.Minute, newTime.Second, newTime.Millisecond, newTime.Microsecond);
                    }
                    else result = TimeOnly.FromDateTime((DateTime)value);
                    break;
                    
                case InputType.Relation:
                    if (!config.IsEnumerable)
                        result = ((IEnumerable)value).OfType<object>().FirstOrDefault();
                    else {
                        needsOverride = false;

                        var newItems = ((IEnumerable)value).OfType<object>();

                        var collection = Activator.CreateInstance(config.Info.PropertyType);
                        var addMethod = config.Info.PropertyType.GetMethod(nameof(ICollection<object>.Add));

                        if (addMethod is null)
                            throw new ArgumentException($"Cannot modify property '{config.Name}' on table '{config.Table}' because no 'Add' method is implemented");
                        
                        foreach (var item in newItems) {
                            addMethod.Invoke(collection, [item]);
                        }
                        
                        _changes.Add(new PropertyChange(config.Info, collection));
                    }
                    break;
                
                default:
                    throw new ArgumentOutOfRangeException(nameof(senderType), senderType, null);
            }
        }

        if (config.Parser is not null && result is not null) {
            result = await config.Parser(result.ToString()!, Provider);
        }

        if (needsOverride)
            _changes.Add(new PropertyChange(config.Info, result));
    }

    private void ApplyChanges(object entry) {
        foreach (var prop in Content.Config.Properties) {
            var newValue = GetNewestValue(prop);
            prop.SetValue(entry, newValue, Provider);
        }
    }

    private object? GetNewestValue(PropertyConfig config) {
        var value = config.GetValue(Content.CurrentObject, Provider);

        var change = _changes.LastOrDefault(c => c.Property == config.Info);
        if (change is not null)
            value = change.Value;

        return value;
    }

    private async Task OpenRelationalPicker(PropertyConfig config) {
        if (!await Handler.IsAuthenticatedAsync(_currentlyEditing ? Content.Config.UpdatePolicy : Content.Config.CreatePolicy))
            return;

        var relationType = config.Info.PropertyType;
        if (config.IsEnumerable) {
            relationType = relationType.GetGenericArguments().First();
        }
        
        var relationTable = Explorer.GetTable(relationType);
        if (relationTable is null) return;

        var currentValues = new List<object>();
        if (config.IsEnumerable) {
            foreach (var o in GetPropertyValue<IEnumerable>(config) ?? Enumerable.Empty<object>()) {
                currentValues.Add(o);
            }
        }
        else {
            var raw = GetNewestValue(config);
            if (raw is not null)
                currentValues.Add(raw);
        }
        
        var dialog = await Dialogs.ShowDialogAsync<HopFrameRelationPicker>(new RelationPickerDialogData(relationTable, currentValues, config.IsEnumerable), new DialogParameters());
        var result = await dialog.Result;
        if (result.Cancelled) return;
        
        var data = (RelationPickerDialogData)result.Data!;
        await SetPropertyValue(config, data.SelectedObjects, InputType.Relation);
    }

    private async Task<bool> ValidateInputs() {
        if (!await Handler.IsAuthenticatedAsync(_currentlyEditing ? Content.Config.UpdatePolicy : Content.Config.CreatePolicy))
            return false;
        
        foreach (var property in Content.Config.Properties) {
            if (property.IsVirtualProperty) continue;
            
            var errorList = _validationErrors[property.Name];
            errorList.Clear();
            var value = GetNewestValue(property);

            if (property.Validator is not null) {
                errorList.AddRange(await property.Validator.Invoke(value, Provider));
                continue;
            }
            
            if (value is null && property.IsRequired)
                errorList.Add($"{property.Name} is required");

            var eventResult = await PluginOrchestrator.DispatchEvent(new ValidationEvent(this) {
                Errors = errorList,
                Property = property,
                Table = Content.Config
            }, _tokenSource.Token);

            if (eventResult.IsCanceled) return false;
        }

        StateHasChanged();
        var valid = _validationErrors
            .Select(err => err.Value.Count)
            .All(c => c == 0);

        if (!valid) return false;
        var dialog = await Dialogs.ShowConfirmationAsync($"Do you really want to {(_currentlyEditing ? "edit" : "create")} this entry?");
        var result = await dialog.Result;
        if (result.Cancelled) return false;
        
        ApplyChanges(Content.CurrentObject!);
        return true;
    }

    public void Dispose() {
        _tokenSource.Dispose();
    }

    public enum InputType {
        Number,
        Switch,
        Date,
        Time,
        Enum,
        Text,
        Relation
    }
}