@rendermode InteractiveServer

@using System.Collections
@using BlazorStrap
@using BlazorStrap.Shared.Components.Modal
@using static Microsoft.AspNetCore.Components.Web.RenderMode
@using BlazorStrap.V5
@using CurrieTechnologies.Razor.SweetAlert2
@using HopFrame.Database.Repositories
@using HopFrame.Security.Claims
@using HopFrame.Web.Admin
@using HopFrame.Web.Admin.Models
@using HopFrame.Web.Admin.Providers
@using Microsoft.AspNetCore.Components.Forms
@using Microsoft.AspNetCore.Components.Web

<BSModal DataId="admin-page-modal" HideOnValidSubmit="true" IsStaticBackdrop="true" @ref="_modal">
    <BSForm TValue="object" EditContext="_context" OnValidSubmit="Save">
        @if (!_isEdit) {
            <BSModalHeader>Create entry</BSModalHeader>
        }
        else {
            <BSModalHeader>Edit entry</BSModalHeader>
        }
        
        <BSModalContent>
            @foreach (var prop in GetEditableProperties()) {
                @if (!_isEdit && prop.Generated) continue;

                <div class="mb-3">
                    @if (IsListType(prop)) {
                        <BSLabel>@prop.DisplayName</BSLabel>
                        <BSListGroup>
                            <BSListGroupItem>
                                <BSListGroup IsFlush="true">
                                    @foreach (var element in GetListPropertyValues(prop).Select((e, i) => new { e, i })) {
                                        <BSListGroupItem>
                                            <BSButton Color="BSColor.Danger" Size="Size.ExtraSmall" MarginEnd="Margins.Small" OnClick="() => DeleteListItem(prop, element.i)">
                                                <HopIconDisplay Type="HopIconDisplay.HopIcon.Cross"/>
                                            </BSButton>

                                            <span>@element.e</span>
                                        </BSListGroupItem>
                                    }
                                </BSListGroup>
                            </BSListGroupItem>
                            <BSListGroupItem>
                                <div>
                                    @if (!prop.Selector) {
                                        <form style="display: flex; gap: 20px" @onsubmit="() => AddListItem(prop)">
                                            <input type="text" class="form-control" @onchange="v => _inputValues[prop] = (string)v.Value" required/>
                                            <BSButton Color="BSColor.Secondary" IsSubmit="true">Add</BSButton>
                                        </form>
                                    }
                                    else {
                                        <form style="display: flex; gap: 20px" @onsubmit="() => AddListItem(prop)">
                                            <select class="form-select" @onchange="e => _inputValues[prop] = ReadSelectorValue(prop, e.Value)">
                                                <option selected>Select</option>

                                                @foreach (var element in SetupSelectorProperty(prop).GetAwaiter().GetResult()) {
                                                    <option value="@element.Item2">@element.Item1</option>
                                                }
                                            </select>
                                            <BSButton Color="BSColor.Secondary" IsSubmit="true">Add</BSButton>
                                        </form>
                                    }
                                </div>
                            </BSListGroupItem>
                        </BSListGroup>
                    }
                    else if (IsSwitch(prop)) {
                        <div class="form-check form-switch">
                            <BSLabel>@prop.DisplayName</BSLabel>
                            <input class="form-check-input" type="checkbox" checked="@_values[prop]" @onchange="e => _values[prop] = Convert.ToBoolean(e.Value)">
                        </div>
                    }
                    else if (prop.Prefix is not null && !_isEdit) {
                        <BSInputGroup>
                            <span class="@BS.Input_Group_Text">@prop.Prefix</span>
                            <input type="text" class="form-control" required="@IsRequired(prop)" disabled="@IsDisabled(prop)" value="@GetPropertyValue(prop)" @onchange="e => _values[prop] = prop.Prefix + e.Value"/>
                        </BSInputGroup>
                    }
                    else if (prop.Selector) {
                        <BSLabel>@prop.DisplayName</BSLabel>
                        <select class="form-select" @onchange="e => _values[prop] = ReadSelectorValue(prop, e.Value)">
                            <option>Select</option>
                            
                            @foreach (var element in SetupSelectorProperty(prop).GetAwaiter().GetResult()) {
                                <option value="@element.Item2" selected="@IsIndexSelected(prop, element.Item2)">@element.Item1</option>
                            }
                        </select>
                    }
                    else {
                        <BSLabel>@prop.DisplayName</BSLabel>
                        <input type="@GetInputType(prop)" class="form-control" required="@IsRequired(prop)" disabled="@IsDisabled(prop)" value="@GetPropertyValue(prop)" @onchange="e => _values[prop] = e.Value"/>
                        @if (_validation[_validationIdentifiers[prop]].Any()) {
                            <div class="invalid-feedback" style="display: block">
                                @_validation[_validationIdentifiers[prop]].First()
                            </div>
                        }
                    }
                </div>
            }
        </BSModalContent>
        
        <BSModalFooter>
            <BSButton Target="admin-page-modal">Cancel</BSButton>
            <BSButton IsSubmit="true" Color="BSColor.Primary">Save</BSButton>
        </BSModalFooter>
    </BSForm>
</BSModal>

@inject IServiceProvider Provider
@inject IAdminPagesProvider PageProvider
@inject SweetAlertService Alerts
@inject IPermissionRepository Permissions
@inject ITokenContext Auth

@code {
    #pragma warning disable CS4014
    
    [Parameter]
    public Func<Task> ReloadDelegate { get; set; }
    
    private BSModalBase _modal;
    private EditContext _context;
    private ValidationMessageStore _validation;
    private Dictionary<AdminPageProperty, FieldIdentifier> _validationIdentifiers;
    private IDictionary<AdminPageProperty, object> _values;
    private Dictionary<AdminPageProperty, object[]> _selectorValues;
    private IModelProvider _provider;

    private AdminPage _currentPage;
    private object _entry;
    private bool _isEdit;
    private IDictionary<AdminPageProperty, object> _inputValues;

    public async Task Show(AdminPage page, object entryToEdit = null) {
        _entry = null;
        _inputValues = new Dictionary<AdminPageProperty, object>();
        _selectorValues = new Dictionary<AdminPageProperty, object[]>();
        
        _currentPage = page;
        _entry = entryToEdit;
        _isEdit = entryToEdit is not null;
        _provider = _currentPage.LoadModelProvider(Provider);

        _entry ??= Activator.CreateInstance(_currentPage.ModelType);
        _context = new EditContext(_entry);
        _validation = new ValidationMessageStore(_context);
        _validationIdentifiers = new Dictionary<AdminPageProperty, FieldIdentifier>();
        _context.OnValidationRequested += Validate;

        _values = new Dictionary<AdminPageProperty, object>();
        foreach (var property in _currentPage.Properties) {
            _values.Add(property, property.GetValue(_entry));
            _validationIdentifiers.Add(property, new FieldIdentifier(_entry, property.Name));
        }

        await _modal.ShowAsync();
    }

    private IList<AdminPageProperty> GetEditableProperties() {
        return _currentPage.Properties
            .Where(p => !p.Ignore)
            .OrderBy(p => p.Editable)
            .ToList();
    }

    private bool IsDisabled(AdminPageProperty prop) => (_isEdit && !prop.Editable) || prop.Generated;
    private bool IsRequired(AdminPageProperty prop) => !_isEdit ? prop.Required : prop.Required && prop.EditDisplayValue;
    private bool IsSwitch(AdminPageProperty prop) => prop.Type == typeof(bool);
    private bool IsListType(AdminPageProperty prop) => IsListType(prop.Type);
    
    private bool IsListType(Type type) {
        if (!type.IsGenericType) return false;
        var generic = type.GenericTypeArguments[0];
        var gListType = typeof(IList<>).MakeGenericType(generic);
        var iListType = typeof(List<>).MakeGenericType(generic);
        return type.IsAssignableFrom(gListType) || type.IsAssignableFrom(iListType);
    }

    private IList<string> GetListPropertyValues(AdminPageProperty prop) {
        if (!IsListType(prop)) return new List<string>();
        var list = new List<string>();

        var values = prop.GetValue(_entry);
        
        if (values is null) {
            prop.SetValue(_entry, Activator.CreateInstance(prop.Type));
            return list;
        }
        
        foreach (var value in (IEnumerable)values) {
            list.Add(MapPropertyValue(value, prop));
        }

        return list;
    }

    private string GetPropertyValue(AdminPageProperty property) {
        if (!_isEdit) return "";
        if (!property.EditDisplayValue) return "";
        return MapPropertyValue(property.GetValue(_entry), property);
    }

    public string MapPropertyValue(object value, AdminPageProperty property, bool isSubProperty = false) {
        if (value is null) return string.Empty;
        var type = value.GetType();

        var page = PageProvider.HasPageFor(type);
        if (page is not null && !string.IsNullOrWhiteSpace(page.ListingProperty)) {
            var prop = page.Properties
                .SingleOrDefault(p => p.Name == page.ListingProperty);

            if (prop is not null) {
                return MapPropertyValue(prop.GetValue(value), prop);
            }
        }

        if (!string.IsNullOrEmpty(property.DisplayPropertyName) && !isSubProperty) {
            var prop = type.GetProperties()
                .SingleOrDefault(p => p.Name == property.DisplayPropertyName);

            return MapPropertyValue(prop?.GetValue(value), property, true);
        }
        
        var stringValue = value.ToString();

        if (!string.IsNullOrWhiteSpace(property.Prefix)) {
            return stringValue?.Replace(property.Prefix, "");
        }

        return stringValue;
    }

    private string GetInputType(AdminPageProperty property) {
        if (!property.EditDisplayValue)
            return "password";

        return "text";
    }

    private void Validate(object sender, ValidationRequestedEventArgs e) {
        _validation.Clear();
        foreach (var value in _values) {
            if (value.Key.Unique) {
                if (value.Value == value.Key.GetValue(_entry)) continue;
                var data = _provider!.ReadAllO().GetAwaiter().GetResult();
                foreach (var entry in data) {
                    var other = value.Key.GetValue(entry);
                    if (!other.Equals(value.Value)) continue;
                    _validation.Add(_validationIdentifiers[value.Key], $"This {value.Key.DisplayName ?? value.Key.Name} already exists!");
                    break;
                }
            }
            
            if (value.Key.Validator is null) continue;
            var error = value.Key.Validator?.Invoke(value.Value);
            if (string.IsNullOrEmpty(error)) continue;
            _validation.Add(_validationIdentifiers[value.Key], error);
        }
    }

    private void DeleteListItem(AdminPageProperty prop, int index) {
        var list = prop.GetValue<IList>(_entry);
        list.RemoveAt(index);
    }

    private void AddListItem(AdminPageProperty prop) {
        if (!_inputValues.TryGetValue(prop, out var input) || input is null) {
            Alerts.FireAsync(new SweetAlertOptions {
                Title = "Error!",
                Text = "Please enter a value!",
                Icon = SweetAlertIcon.Error
            });
            return;
        }
        
        var list = prop.GetValue<IList>(_entry);
        var value = prop.Parser?.Invoke(_entry, input) ?? input;
        list?.Add(value);
    }

    private async Task<(string, int)[]> SetupSelectorProperty(AdminPageProperty property) {
        var type = property.SelectorType ?? property.Type;
        if (IsListType(type)) {
            type = type.GenericTypeArguments[0];
        }

        var page = PageProvider.HasPageFor(type);
        if (page is null) {
            throw new ArgumentException($"'{property.Name}' cannot be a selector because a admin page for '{type.Name}' does not exist!");
        }

        var repo = page.LoadModelProvider(Provider);
        var objects = (await repo!.ReadAllO()).ToArray();
        _selectorValues[property] = objects;

        var data = new List<(string, int)>();
        for (var i = 0; i < objects.Length; i++) {
            data.Add((MapPropertyValue(objects[i], property), i));
        }

        return data.ToArray();
    }

    private bool IsIndexSelected(AdminPageProperty property, int index) {
        var value = property.GetValue(_entry);
        if (value is null) return false;
        return _selectorValues[property][index] == value;
    }

    private object ReadSelectorValue(AdminPageProperty property, object value) {
        if (!int.TryParse(value.ToString(), out int result)) {
            return null;
        }
        
        return _selectorValues[property][result];
    }

    private async void Save() {
        if (_isEdit && _currentPage.Permissions.Update is not null) {
            if (!await Permissions.HasPermission(Auth.User, _currentPage.Permissions.Update)) {
                await Alerts.FireAsync(new SweetAlertOptions {
                    Title = "Unauthorized!",
                    Text = "You don't have the required permissions to edit an entry!",
                    Icon = SweetAlertIcon.Error
                });
                return;
            }
        }else if (_currentPage.Permissions.Create is not null) {
            if (!await Permissions.HasPermission(Auth.User, _currentPage.Permissions.Create)) {
                await Alerts.FireAsync(new SweetAlertOptions {
                    Title = "Unauthorized!",
                    Text = "You don't have the required permissions to add an entry!",
                    Icon = SweetAlertIcon.Error
                });
                return;
            }
        }
        
        foreach (var value in _values) {
            if (IsListType(value.Key)) continue;
            value.Key.SetValue(_entry, value.Key.Parser?.Invoke(_entry, value.Value) ?? Convert.ChangeType(value.Value, value.Key.Type));
        }

        if (!_isEdit) {
            await _provider.CreateO(_entry);
            
            Alerts.FireAsync(new SweetAlertOptions {
                Title = "New entry added!",
                Icon = SweetAlertIcon.Success,
                ShowConfirmButton = false,
                Timer = 1500
            });
        }
        else {
            await _provider.UpdateO(_entry);
            
            Alerts.FireAsync(new SweetAlertOptions {
                Title = "Entry updated!",
                Icon = SweetAlertIcon.Success,
                ShowConfirmButton = false,
                Timer = 1500
            });
        }

        await ReloadDelegate.Invoke();
    }
}