@using System.Text.RegularExpressions
@using Microsoft.AspNetCore.Components.Rendering
@namespace Chrono.Components

@if (Card != null)
{
    <div class="modal-backdrop" @onclick="HandleBackdropClick"></div>
    <div class="card-detail @(!HasImage ? "card-detail-noimg" : "")">
        <button class="detail-close" @onclick="HandleClose"><i class="bi bi-x-lg"></i></button>
        <div class="detail-layout @(!HasImage ? "layout-noimg" : "")">
            @if (HasImage)
            {
                <div class="detail-image">
                    <img src="@Card.ImagePath" alt="@Card.Name"
                         onerror="this.src='@Card.SmallImagePath';this.onerror=null;"/>
                </div>
            }
            <div class="detail-info">
                <div class="detail-header">
                    <h2>@Card.Name</h2>
                    <div class="detail-meta">
                        <span class="meta-badge category @Card.Category?.ToLowerInvariant()">@Card.Category</span>
                        @if (Card.Cost.HasValue)
                        {
                            <span class="meta-badge cost"><i class="bi bi-lightning-fill"></i> @Card.Cost</span>
                        }
                        @if (Card.Attack.HasValue)
                        {
                            <span class="meta-badge attack"><i class="bi bi-crosshair"></i> @Card.Attack</span>
                        }
                        @if (Card.Health.HasValue)
                        {
                            <span class="meta-badge health"><i class="bi bi-heart-fill"></i> @Card.Health</span>
                        }
                        @if (Card.Speed != null)
                        {
                            <span class="meta-badge speed"><i class="bi bi-wind"></i> @Card.Speed</span>
                        }
                    </div>
                </div>

                @if (Card.Syndicate != null)
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-diagram-3-fill"></i> Syndicate</span>
                        <span class="field-value">@Card.Syndicate</span>
                    </div>
                }

                @if (Card.Description != null)
                {
                    <div class="detail-field description">
                        <span class="field-label"><i class="bi bi-chat-quote-fill"></i></span>
                        <div class="markdown-content">
                            @RenderDescription(Card.Description)
                        </div>
                    </div>
                }

                @if (Card.Set != null)
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-collection"></i> Set</span>
                        <span class="field-value">@Card.Set</span>
                    </div>
                }

                @if (Card.Archetypes is { Count: > 0 })
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-layers-fill"></i> Archetypes</span>
                        <span class="field-value">@string.Join(", ", Card.Archetypes)</span>
                    </div>
                }

                @if (Card.ImmortalizeWhen != null)
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-star-fill"></i> Immortalize When</span>
                        <span class="field-value">@Card.ImmortalizeWhen</span>
                    </div>
                }

                @if (Card.HasImmortalize)
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-arrow-right-circle-fill"></i> Immortalizes To</span>
                        <span class="field-value">
                            @foreach (var name in Card.ImmortalizeTo!)
                            {
                                var targetName = name;
                                var target = LookupCard(targetName);
                                if (target != null)
                                {
                                    <button class="inline-card-btn"
                                            @onclick="() => Navigate(targetName)">@targetName</button>
                                }
                                else
                                {
                                    @targetName
                                }
                            }
                        </span>
                    </div>
                }

                @if (Card.ImmortalizeFrom != null)
                {
                    <div class="detail-field">
                        <span class="field-label"><i class="bi bi-arrow-left-circle-fill"></i> Immortalizes From</span>
                        <span class="field-value">
                            @{
                                var fromCard = LookupCard(Card.ImmortalizeFrom);
                                if (fromCard != null)
                                {
                                    <button class="inline-card-btn"
                                            @onclick="() => Navigate(Card.ImmortalizeFrom)">@Card.ImmortalizeFrom</button>
                                }
                                else
                                {
                                    @Card.ImmortalizeFrom
                                }
                            }
                        </span>
                    </div>
                }

                @if (ShowNotes && Card.IsAgent)
                {
                    <div class="detail-field note">
                        <span class="field-label"><i class="bi bi-pencil-fill"></i> Personal Note</span>
                        <textarea class="form-control note-input" @bind="currentNote" @onblur="SaveNote"
                                  placeholder="Add a private note about this agent..."></textarea>
                        @if (isSaving)
                        {
                            <span class="saving-indicator">Saving...</span>
                        }
                    </div>
                }
            </div>
        </div>
    </div>
}

@code {
    [Parameter] public CardData? Card { get; set; }
    [Parameter] public EventCallback OnClose { get; set; }
    [Parameter] public EventCallback<string> OnNavigate { get; set; }
    [Parameter] public bool ShowNotes { get; set; }

    [Inject] private HttpClient Http { get; set; } = default!;

    private bool HasImage => Card?.ImageFile is { Length: > 0 } && Card.ImageFile != "placeholder.png";

    private string currentNote = "";
    private bool isSaving;

    protected override void OnParametersSet()
    {
        if (Card != null && Card.IsAgent)
        {
            currentNote = "";
            _ = LoadNote();
        }
    }

    private async Task LoadNote()
    {
        if (Card == null || !Card.IsAgent) return;
        try
        {
            var note = await Http.GetFromJsonAsync<CardNote>($"api/notes/{Uri.EscapeDataString(Card.Name)}");
            currentNote = note?.Note ?? "";
        }
        catch
        {
            currentNote = "";
        }
    }

    private async Task SaveNote()
    {
        if (Card == null || !Card.IsAgent) return;

        isSaving = true;
        try
        {
            await Http.PostAsJsonAsync("api/notes", new CardNote { CardName = Card.Name, Note = currentNote });
        }
        catch
        {
        }
        finally
        {
            isSaving = false;
        }
    }

    private void HandleClose()
    {
        _ = OnClose.InvokeAsync();
    }

    private void HandleBackdropClick()
    {
        _ = OnClose.InvokeAsync();
    }

    private void Navigate(string name)
    {
        var card = LookupCard(name);
        if (card != null)
        {
            Card = card;
            _ = LoadNote();
            StateHasChanged();
        }
        else
        {
            _ = OnNavigate.InvokeAsync(name);
        }
    }

    private static CardData? LookupCard(string cardName)
    {
        return CardDatabase.Cards.FirstOrDefault(c =>
            string.Equals(c.Name, cardName, StringComparison.OrdinalIgnoreCase));
    }

    private static DocData? LookupDoc(string title)
    {
        return DocDatabase.Docs.FirstOrDefault(d =>
            string.Equals(d.Title, title, StringComparison.OrdinalIgnoreCase));
    }

    private RenderFragment RenderDescription(string content)
    {
        return builder =>
        {
            if (string.IsNullOrWhiteSpace(content)) return;

            var seq = 0;
            var lines = content.Split(['\r', '\n'], StringSplitOptions.None);
            var inList = false;
            var tableLines = new List<string>();
            var inTable = false;

            for (var i = 0; i < lines.Length; i++)
            {
                var line = lines[i];
                var trimmedLine = line.Trim();

                // Handle Tables
                if (trimmedLine.StartsWith("|") && trimmedLine.EndsWith("|"))
                {
                    inTable = true;
                    tableLines.Add(trimmedLine);
                    continue;
                }

                if (inTable)
                {
                    RenderTable(builder, ref seq, tableLines);
                    tableLines.Clear();
                    inTable = false;
                }

                // Handle Lists
                if (trimmedLine.StartsWith("- ") || trimmedLine.StartsWith("* "))
                {
                    if (!inList)
                    {
                        builder.OpenElement(seq++, "ul");
                        inList = true;
                    }

                    var isCardListItem = trimmedLine.Contains("[[") && trimmedLine.Contains("]]");
                    builder.OpenElement(seq++, "li");
                    RenderInlines(builder, ref seq, trimmedLine[2..], true);
                    builder.CloseElement();
                    continue;
                }

                if (inList)
                {
                    builder.CloseElement(); // Close ul
                    inList = false;
                }

                // Handle Headings
                if (trimmedLine.StartsWith("### "))
                {
                    builder.OpenElement(seq++, "h4");
                    RenderInlines(builder, ref seq, trimmedLine[4..], false);
                    builder.CloseElement();
                }
                else if (trimmedLine.StartsWith("## "))
                {
                    builder.OpenElement(seq++, "h3");
                    RenderInlines(builder, ref seq, trimmedLine[3..], false);
                    builder.CloseElement();
                }
                else if (trimmedLine.StartsWith("# "))
                {
                    builder.OpenElement(seq++, "h2");
                    RenderInlines(builder, ref seq, trimmedLine[2..], false);
                    builder.CloseElement();
                }
                else if (!string.IsNullOrWhiteSpace(trimmedLine))
                {
                    builder.OpenElement(seq++, "p");
                    RenderInlines(builder, ref seq, line, false);
                    builder.CloseElement();
                }
            }

            if (inTable) RenderTable(builder, ref seq, tableLines);
            if (inList) builder.CloseElement();
        };
    }

    private void RenderTable(RenderTreeBuilder builder, ref int seq, List<string> lines)
    {
        if (lines.Count < 2) return;

        builder.OpenElement(seq++, "div");
        builder.AddAttribute(seq++, "class", "table-responsive");
        builder.OpenElement(seq++, "table");
        builder.AddAttribute(seq++, "class", "markdown-table");

        var hasHeader = lines.Count > 2 && lines[1].Contains("---");
        var startIdx = 0;

        if (hasHeader)
        {
            builder.OpenElement(seq++, "thead");
            builder.OpenElement(seq++, "tr");
            var cells = lines[0].Split('|', StringSplitOptions.RemoveEmptyEntries);
            foreach (var cell in cells)
            {
                builder.OpenElement(seq++, "th");
                RenderInlines(builder, ref seq, cell.Trim(), false);
                builder.CloseElement();
            }

            builder.CloseElement();
            builder.CloseElement();
            startIdx = 2;
        }

        builder.OpenElement(seq++, "tbody");
        for (var i = startIdx; i < lines.Count; i++)
        {
            if (i == 1 && hasHeader) continue;
            builder.OpenElement(seq++, "tr");
            var cells = lines[i].Split('|', StringSplitOptions.RemoveEmptyEntries);
            foreach (var cell in cells)
            {
                builder.OpenElement(seq++, "td");
                RenderInlines(builder, ref seq, cell.Trim(), false);
                builder.CloseElement();
            }

            builder.CloseElement();
        }

        builder.CloseElement();
        builder.CloseElement();
        builder.CloseElement();
    }

    private void RenderInlines(RenderTreeBuilder builder, ref int seq, string text, bool renderAsImage)
    {
        var remaining = text;

        while (!string.IsNullOrEmpty(remaining))
        {
            var boldMatch = Regex.Match(remaining, @"\*\*(.*?)\*\*");
            var italicMatch = Regex.Match(remaining, @"\*(.*?)\*");
            var cardMatch = Regex.Match(remaining, @"\[\[(.*?)\]\]");

            var bestIdx = int.MaxValue;
            Match? bestMatch = null;
            var matchType = 0; // 1: bold, 2: italic, 3: card

            if (boldMatch.Success && boldMatch.Index < bestIdx)
            {
                bestIdx = boldMatch.Index;
                bestMatch = boldMatch;
                matchType = 1;
            }

            if (italicMatch.Success && italicMatch.Index < bestIdx)
            {
                bestIdx = italicMatch.Index;
                bestMatch = italicMatch;
                matchType = 2;
            }

            if (cardMatch.Success && cardMatch.Index < bestIdx)
            {
                bestIdx = cardMatch.Index;
                bestMatch = cardMatch;
                matchType = 3;
            }

            if (bestMatch != null)
            {
                if (bestIdx > 0)
                    builder.AddContent(seq++, remaining[..bestIdx]);

                var innerText = bestMatch.Groups[1].Value;

                if (matchType == 1) // Bold
                {
                    builder.OpenElement(seq++, "strong");
                    builder.AddContent(seq++, innerText);
                    builder.CloseElement();
                }
                else if (matchType == 2) // Italic
                {
                    builder.OpenElement(seq++, "em");
                    builder.AddContent(seq++, innerText);
                    builder.CloseElement();
                }
                else if (matchType == 3) // Card Link / Doc Link
                {
                    var card = LookupCard(innerText);
                    var doc = LookupDoc(innerText);
                    if (card != null || doc != null)
                    {
                        builder.OpenElement(seq++, "button");
                        builder.AddAttribute(seq++, "class", "inline-card-btn");
                        builder.AddAttribute(seq++, "onclick", EventCallback.Factory.Create(this, () => Navigate(innerText)));
                        builder.AddContent(seq++, innerText);
                        builder.CloseElement();
                    }
                    else
                    {
                        builder.AddContent(seq++, innerText);
                    }
                }

                remaining = remaining[(bestIdx + bestMatch.Length)..];
            }
            else
            {
                builder.AddContent(seq++, remaining);
                remaining = "";
            }
        }
    }

}