@using System.Text.RegularExpressions
@namespace Oqtane.Modules.Controls
@inherits ModuleControlBase
@inject ISettingService SettingService
@inject IStringLocalizer<RichTextEditor> Localizer 

<div class="row" style="margin-bottom: 50px;">
    <div class="col">
        <TabStrip ActiveTab="@_activetab">
			@if (AllowRichText)
            {
                <TabPanel Name="Rich" Heading="Rich Text Editor" ResourceKey="RichTextEditor">
                    @if (_richfilemanager)
                    {
                        <FileManager @ref="_fileManager" Filter="@PageState.Site.ImageFiles" />
                        <ModuleMessage Message="@_message" Type="MessageType.Warning"></ModuleMessage>
                        <br />
                    }
                    <div class="d-flex justify-content-center mb-2">
                        @if (AllowFileManagement)
                        {
                            <button type="button" class="btn btn-primary" @onclick="InsertRichImage">@Localizer["InsertImage"]</button>
                        }
                        @if (_richfilemanager)
                        {
                            @((MarkupString)"&nbsp;&nbsp;")
                            <button type="button" class="btn btn-secondary" @onclick="CloseRichFileManager">@Localizer["Close"]</button>
                        }
                    </div>
                    <div class="row">
                        <div class="col">
                            <div @ref="@_toolBar">
                                @if (ToolbarContent != null)
                                {
                                    @ToolbarContent
                                }
                                else
                                {
                                    <select class="ql-header">
                                        <option selected=""></option>
                                        <option value="1"></option>
                                        <option value="2"></option>
                                        <option value="3"></option>
                                        <option value="4"></option>
                                        <option value="5"></option>
                                    </select>
                                    <span class="ql-formats">
                                        <button class="ql-bold"></button>
                                        <button class="ql-italic"></button>
                                        <button class="ql-underline"></button>
                                        <button class="ql-strike"></button>
                                    </span>
                                    <span class="ql-formats">
                                        <select class="ql-color"></select>
                                        <select class="ql-background"></select>
                                    </span>
                                    <span class="ql-formats">
                                        <button class="ql-list" value="ordered"></button>
                                        <button class="ql-list" value="bullet"></button>
                                    </span>
                                    <span class="ql-formats">
                                        <button class="ql-link"></button>
                                    </span>
                                }
                            </div>
                            <div @ref="@_editorElement"></div>
                        </div>
                    </div>
                </TabPanel>
            }
			@if (AllowRawHtml)
			{
				<TabPanel Name="Raw" Heading="Raw HTML Editor" ResourceKey="HtmlEditor">
					@if (_rawfilemanager)
					{
                        <FileManager @ref="_fileManager" Filter="@PageState.Site.ImageFiles" />
						<ModuleMessage Message="@_message" Type="MessageType.Warning"></ModuleMessage>
						<br />
					}
					<div class="d-flex justify-content-center mb-2">
						@if (AllowFileManagement)
						{
							<button type="button" class="btn btn-primary" @onclick="InsertRawImage">@Localizer["InsertImage"]</button>
						}
						@if (_rawfilemanager)
						{
							@((MarkupString)"&nbsp;&nbsp;")
							<button type="button" class="btn btn-secondary" @onclick="CloseRawFileManager">@Localizer["Close"]</button>
						}
					</div>
					@if (ReadOnly)
					{
                        <textarea id="@_rawhtmlid" class="form-control" placeholder="@Placeholder" @bind="@_rawhtml" rows="10" readonly></textarea>
					}
					else
					{
						<textarea id="@_rawhtmlid" class="form-control" placeholder="@Placeholder" @bind="@_rawhtml" rows="10"></textarea>
					}
				</TabPanel>
			}
        </TabStrip>
    </div>
</div>

@code {
    private bool _initialized = false;

    private RichTextEditorInterop interop;
    private FileManager _fileManager;
    private string _activetab = "Rich";

    private ElementReference _editorElement;
    private ElementReference _toolBar;
    private bool _richfilemanager = false;
    private string _richhtml = string.Empty;
    private string _originalrichhtml = string.Empty;

    private bool _rawfilemanager = false;
    private string _rawhtmlid = "RawHtmlEditor_" + Guid.NewGuid().ToString("N");
    private string _rawhtml = string.Empty;
    private string _originalrawhtml = string.Empty;

    private string _message = string.Empty;
    private bool _contentchanged = false;
    private int _editorIndex;

    [Parameter]
    public string Content { get; set; }

    [Parameter]
    public bool ReadOnly { get; set; } = false;

    [Parameter]
    public string Placeholder { get; set; }

    [Parameter]
    public bool AllowFileManagement { get; set; } = true;

    [Parameter]
    public bool AllowRichText { get; set; } = true;  

    [Parameter]
    public bool AllowRawHtml { get; set; } = true;  

    // parameters only applicable to rich text editor
    [Parameter]
    public RenderFragment ToolbarContent { get; set; }

    [Parameter]
    public string Theme { get; set; } = "snow";

    [Parameter]
    public string DebugLevel { get; set; } = "info";

    public override List<Resource> Resources => new List<Resource>()
    {
        new Resource { ResourceType = ResourceType.Script, Bundle = "Quill", Url = "js/quill.min.js", Location = ResourceLocation.Body },
        new Resource { ResourceType = ResourceType.Script, Bundle = "Quill", Url = "js/quill-blot-formatter.min.js", Location = ResourceLocation.Body },
        new Resource { ResourceType = ResourceType.Script, Bundle = "Quill", Url = "js/quill-interop.js", Location = ResourceLocation.Body }
    };

    protected override void OnInitialized()
    {
        interop = new RichTextEditorInterop(JSRuntime);
        if (string.IsNullOrEmpty(Placeholder))
        {
            Placeholder = Localizer["Placeholder"];
        }
    }

    protected override void OnParametersSet()
    {
        _richhtml = Content;
        _rawhtml = Content;
        _originalrawhtml = _rawhtml; // preserve for comparison later
        _originalrichhtml = "";

        if (Content != _originalrawhtml)
        {
            _contentchanged = true; // identifies when Content parameter has changed
        }

        if (!AllowRichText)
        {
            _activetab = "Raw";
        }
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await base.OnAfterRenderAsync(firstRender);

        if (AllowRichText)
        {
            if (firstRender)
            {
                await interop.CreateEditor(
                    _editorElement,
                    _toolBar,
                    ReadOnly,
                    Placeholder,
                    Theme,
                    DebugLevel);

                await interop.LoadEditorContent(_editorElement, _richhtml);

                // preserve a copy of the content (Quill sanitizes content so we need to retrieve it from the editor as it may have been modified)
                _originalrichhtml = await interop.GetHtml(_editorElement);

                _initialized = true;
            }
            else
            {
                if (_initialized)
                {
                    if (_contentchanged)
                    {
                        // reload editor if Content passed to component has changed
                        await interop.LoadEditorContent(_editorElement, _richhtml);
                        _originalrichhtml = await interop.GetHtml(_editorElement);
                    }
                    else
                    {
                        // preserve changed content on re-render event
                        var richhtml = await interop.GetHtml(_editorElement);
                        if (richhtml != _richhtml)
                        {
                            _richhtml = richhtml;
                            await interop.LoadEditorContent(_editorElement, _richhtml);
                        }
                    }
                }
            }

            _contentchanged = false;
        }
    }

    public void CloseRichFileManager()
    {
        _richfilemanager = false;
        _message = string.Empty;
        StateHasChanged();
    }

    public void CloseRawFileManager()
    {
        _rawfilemanager = false;
        _message = string.Empty;
        StateHasChanged();
    }

    public async Task<string> GetHtml()
    {
        // evaluate raw html content as first priority
        if (_rawhtml != _originalrawhtml)
        {
            return _rawhtml;
        }
        else
        {
            var richhtml = "";

            if (AllowRichText)
            {
                richhtml = await interop.GetHtml(_editorElement);
            }

            if (richhtml != _originalrichhtml && !string.IsNullOrEmpty(richhtml))
            {
                // convert Quill's empty content to empty string
                if (richhtml == "<p><br></p>")
                {
                    richhtml = string.Empty;
                }
                return richhtml;
            }
            else
            {
                // return original raw html content
                return _originalrawhtml;
            }
        }
    }

    public async Task InsertRichImage()
    {
        _message = string.Empty;
        if (_richfilemanager)
        {            
            var file = _fileManager.GetFile();
			if (file != null)
			{
                await interop.InsertImage(_editorElement, file.Url, ((!string.IsNullOrEmpty(file.Description)) ? file.Description : file.Name), _editorIndex);
                _richhtml = await interop.GetHtml(_editorElement);
                _richfilemanager = false;
			}
			else
			{
				_message = Localizer["Message.Require.Image"];
			}
		}
		else
		{
            _editorIndex = await interop.GetCurrentCursor(_editorElement);
			_richfilemanager = true;
		}
		StateHasChanged();
	}

	public async Task InsertRawImage()
	{
		_message = string.Empty;
		if (_rawfilemanager)
		{
			var file = _fileManager.GetFile();
			if (file != null)
			{
				var interop = new Interop(JSRuntime);
                int pos = await interop.GetCaretPosition(_rawhtmlid);
				var image = "<img src=\"" + file.Url + "\" alt=\"" + ((!string.IsNullOrEmpty(file.Description)) ? file.Description : file.Name) + "\" class=\"img-fluid\">";
				_rawhtml = _rawhtml.Substring(0, pos) + image + _rawhtml.Substring(pos);
				_rawfilemanager = false;
			}
			else
			{
				_message = Localizer["Message.Require.Image"];
			}
		}
		else
		{
			_rawfilemanager = true;
		}
		StateHasChanged();
	}
}