@page "/intelligence"
@attribute [Authorize]
@using NexusReader.Application.DTOs.AI
@using NexusReader.Application.Abstractions.Services
@using NexusReader.Application.DTOs.User
@using System.Net.Http.Json
@inject HttpClient Http
@inject IKnowledgeService KnowledgeService
@inject AuthenticationStateProvider AuthStateProvider


<div class="intelligence-page">
    <header class="intelligence-header">
        <div class="header-title-section">
            <h1>Global AI Q&A</h1>
            <p class="subtitle">Search, interrogate, and extract grounded facts from your library using Polyglot KM-RAG</p>
        </div>
    </header>

    <div class="intelligence-layout glass-panel">
        <div class="search-scope-bar">
            <div class="input-group search-input-group">
                <input class="nexus-input" 
                       placeholder="Ask a question about your books..." 
                       @bind="_question" 
                       @bind:event="oninput"
                       @onkeyup="HandleKeyUp" />
                <button class="btn-nexus primary search-btn" 
                        disabled="@(string.IsNullOrWhiteSpace(_question) || _isLoading)" 
                        @onclick="AskQuestionAsync">
                    @if (_isLoading)
                    {
                        <div class="spinner-glow small btn-spinner"></div>
                    }
                    else
                    {
                        <span>Ask AI</span>
                    }
                </button>
            </div>
            
            <div class="scope-selector">
                <label for="book-select">Scope:</label>
                <select id="book-select" class="nexus-select" @bind="_selectedBookId">
                    <option value="">All Books (Global Search)</option>
                    @if (_books != null)
                    {
                        @foreach (var book in _books)
                        {
                            <option value="@book.Id">@book.Title</option>
                        }
                    }
                </select>
            </div>
        </div>

        <div class="results-area">
            @if (_isLoading)
            {
                <div class="loading-state">
                    <div class="nexus-spinner"></div>
                    <span>Analyzing conceptual graph and synthesizing response...</span>
                </div>
            }
            else if (_response != null)
            {
                <div class="response-container">
                    <div class="response-section">
                        <h4><i class="bi bi-robot"></i> Answer</h4>
                        <div class="answer-text">
                            @_response.Answer
                        </div>
                    </div>

                    @if (_response.Citations != null && _response.Citations.Any())
                    {
                        <div class="citations-section">
                            <h4><i class="bi bi-journal-check"></i> Grounded Citations</h4>
                            <div class="citations-grid">
                                @foreach (var citation in _response.Citations)
                                {
                                    <div class="citation-card">
                                        <div class="citation-header">
                                            <span class="source-badge">@citation.SourceBook</span>
                                            @if (!string.IsNullOrEmpty(citation.CitationId) && citation.CitationId.Length > 8)
                                            {
                                                <span class="id-badge">ID: @citation.CitationId.Substring(0, Math.Min(8, citation.CitationId.Length))</span>
                                            }
                                        </div>
                                        <div class="citation-body">
                                            "@citation.Snippet"
                                        </div>
                                    </div>
                                }
                            </div>
                        </div>
                    }
                </div>
            }
            else if (_hasSearched)
            {
                <div class="empty-state">
                    <i class="bi bi-info-circle"></i>
                    <p>No answers generated. Try adjusting your question.</p>
                </div>
            }
            else
            {
                <div class="welcome-state">
                    <div class="welcome-icon">
                        <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
                            <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"></path>
                        </svg>
                    </div>
                    <h3>Start Interrogating Your Library</h3>
                    <p>Ask complex questions across all your books. The system will search vectors, pull concept graph relations, and formulate a grounded answer with precise citations.</p>
                </div>
            }
        </div>
    </div>
</div>

<style>
    .intelligence-page {
        padding: 3rem 2rem;
        max-width: 1100px;
        margin: 0 auto;
        animation: fadeIn 0.5s ease-out;
    }

    .intelligence-header {
        margin-bottom: 2rem;
    }

    .header-title-section h1 {
        font-family: var(--nexus-font-serif);
        font-size: 2.8rem;
        font-weight: 700;
        margin: 0 0 0.5rem 0;
        background: linear-gradient(135deg, var(--nexus-text, #ffffff) 0%, rgba(255, 255, 255, 0.7) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .subtitle {
        font-size: 1rem;
        color: rgba(255, 255, 255, 0.6);
        margin: 0;
    }

    .intelligence-layout {
        padding: 2.5rem;
        border-radius: 20px;
        background: rgba(255, 255, 255, 0.03);
        border: 1px solid rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .search-scope-bar {
        display: flex;
        gap: 1.5rem;
        align-items: center;
        margin-bottom: 2.5rem;
        flex-wrap: wrap;
    }

    .search-input-group {
        flex-grow: 1;
        display: flex;
        background: rgba(255, 255, 255, 0.02);
        border: 1px solid rgba(255, 255, 255, 0.05);
        border-radius: 10px;
        padding: 0.25rem 0.25rem 0.25rem 1.25rem;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .search-input-group:focus-within {
        border-color: var(--nexus-neon);
        background: rgba(0, 255, 153, 0.02);
        box-shadow: 0 0 15px rgba(0, 255, 153, 0.15);
    }

    .nexus-input {
        flex-grow: 1;
        background: transparent;
        border: none;
        color: #ffffff;
        font-size: 1rem;
        font-family: var(--nexus-font-sans);
        outline: none;
        padding: 0.5rem 0;
    }

    .nexus-input::placeholder {
        color: rgba(255, 255, 255, 0.4);
    }

    .btn-nexus {
        padding: 0.75rem 1.25rem;
        border-radius: 10px;
        font-size: 0.9rem;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.2s;
        border: none;
        font-family: var(--nexus-font-sans);
    }

    .btn-nexus.primary {
        background: var(--nexus-neon);
        color: #000000;
    }

    .btn-nexus:hover:not(:disabled) {
        transform: translateY(-2px);
        filter: brightness(1.1);
        box-shadow: 0 4px 12px rgba(0, 255, 153, 0.3);
    }

    .btn-nexus:disabled {
        background: rgba(255, 255, 255, 0.05);
        color: rgba(255, 255, 255, 0.3);
        cursor: not-allowed;
    }

    .search-btn {
        padding: 0.5rem 1.5rem !important;
        font-size: 0.95rem !important;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .scope-selector {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        color: #A0A0A0;
        font-family: var(--nexus-font-sans);
    }

    .nexus-select {
        background: rgba(255, 255, 255, 0.02);
        border: 1px solid rgba(255, 255, 255, 0.05);
        color: #ffffff;
        padding: 0.5rem 2.5rem 0.5rem 1rem;
        border-radius: 10px;
        outline: none;
        cursor: pointer;
        font-family: var(--nexus-font-sans);
        font-size: 0.9rem;
        transition: all 0.3s ease;
        appearance: none;
        -webkit-appearance: none;
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
        background-repeat: no-repeat;
        background-position: right 1rem center;
        background-size: 1em;
    }

    .nexus-select:focus {
        border-color: var(--nexus-neon);
        background-color: rgba(0, 255, 153, 0.02);
        box-shadow: 0 0 10px rgba(0, 255, 153, 0.15);
    }

    .results-area {
        min-height: 250px;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .loading-state {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        color: rgba(255, 255, 255, 0.7);
    }

    .nexus-spinner {
        width: 50px;
        height: 50px;
        border: 3px solid rgba(0, 255, 153, 0.1);
        border-radius: 50%;
        border-top-color: var(--nexus-neon);
        animation: spin 1s linear infinite;
        filter: drop-shadow(0 0 8px var(--nexus-neon));
    }

    .welcome-state, .empty-state {
        text-align: center;
        color: rgba(255, 255, 255, 0.5);
        padding: 3rem 1rem;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .welcome-icon {
        color: rgba(255, 255, 255, 0.25);
        margin-bottom: 1.5rem;
        animation: pulse 2s infinite alternate;
    }

    .welcome-state h3 {
        color: #ffffff;
        font-family: var(--nexus-font-sans);
        margin: 0 0 0.5rem 0;
    }

    .welcome-state p, .empty-state p {
        max-width: 500px;
        margin: 0;
        font-size: 0.95rem;
        line-height: 1.6;
    }

    .response-container {
        display: flex;
        flex-direction: column;
        gap: 2.5rem;
        animation: slideUp 0.4s ease-out;
    }

    .response-section h4, .citations-section h4 {
        font-size: 1.1rem;
        text-transform: uppercase;
        letter-spacing: 1px;
        color: rgba(255, 255, 255, 0.5);
        margin: 0 0 1rem 0;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .answer-text {
        font-size: 1.15rem;
        line-height: 1.7;
        color: #ffffff;
        background: rgba(255, 255, 255, 0.02);
        padding: 1.5rem;
        border-radius: 12px;
        border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .citations-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .citation-card {
        background: rgba(255, 255, 255, 0.01);
        border: 1px solid rgba(255, 255, 255, 0.05);
        border-radius: 12px;
        padding: 1.25rem;
        transition: all 0.3s ease;
    }

    .citation-card:hover {
        border-color: rgba(0, 255, 153, 0.3);
        transform: translateY(-2px);
        background: rgba(255, 255, 255, 0.05);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    }

    .citation-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 0.75rem;
    }

    .source-badge {
        font-size: 0.8rem;
        font-weight: 600;
        color: var(--nexus-neon);
        background: rgba(0, 255, 153, 0.05);
        border: 1px solid rgba(0, 255, 153, 0.2);
        padding: 0.25rem 0.75rem;
        border-radius: 20px;
    }

    .id-badge {
        font-size: 0.75rem;
        color: rgba(255, 255, 255, 0.4);
        font-family: monospace;
    }

    .citation-body {
        font-size: 0.95rem;
        line-height: 1.5;
        color: rgba(255, 255, 255, 0.8);
        font-style: italic;
    }

    .btn-spinner {
        margin: 0;
    }

    /* Animations */
    @@keyframes fadeIn {
        from { opacity: 0; transform: translateY(15px); }
        to { opacity: 1; transform: translateY(0); }
    }

    @@keyframes slideUp {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }

    @@keyframes spin {
        0% { transform: rotate(0deg); }
        100% { transform: rotate(360deg); }
    }

    @@keyframes pulse {
        0% { transform: scale(0.95); opacity: 0.7; }
        100% { transform: scale(1.05); opacity: 1; }
    }
</style>

@code {
    private string _question = string.Empty;
    private string _selectedBookId = string.Empty;
    private bool _isLoading;
    private bool _hasSearched;
    private GroundedResponseDto? _response;
    private List<LastReadBookDto>? _books;

    protected override async Task OnInitializedAsync()
    {
        try
        {
            _books = await Http.GetFromJsonAsync<List<LastReadBookDto>>("api/library/books");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[Intelligence] Failed to load books for scope selector: {ex.Message}");
        }
    }

    private async Task HandleKeyUp(KeyboardEventArgs e)
    {
        if (e.Key == "Enter" && !string.IsNullOrWhiteSpace(_question) && !_isLoading)
        {
            await AskQuestionAsync();
        }
    }

    private async Task AskQuestionAsync()
    {
        if (string.IsNullOrWhiteSpace(_question) || _isLoading) return;

        _isLoading = true;
        _hasSearched = true;
        _response = null;
        StateHasChanged();

        try
        {
            Guid? ebookId = null;
            if (!string.IsNullOrEmpty(_selectedBookId) && Guid.TryParse(_selectedBookId, out var parsedId))
            {
                ebookId = parsedId;
            }

            var authState = await AuthStateProvider.GetAuthenticationStateAsync();
            var tenantId = authState.User.FindFirst("TenantId")?.Value ?? "global";

            var result = await KnowledgeService.AskQuestionAsync(_question, tenantId, ebookId);
            if (result.IsSuccess)
            {
                _response = result.Value;
            }
            else
            {
                _response = new GroundedResponseDto
                {
                    Answer = $"Error: {result.Errors.FirstOrDefault()?.Message ?? "An error occurred."}",
                    Citations = new List<CitationDto>()
                };
            }
        }
        catch (Exception ex)
        {
            _response = new GroundedResponseDto
            {
                Answer = $"Network/API Error: {ex.Message}",
                Citations = new List<CitationDto>()
            };
        }
        finally
        {
            _isLoading = false;
            StateHasChanged();
        }
    }
}