@page "/library"
@inject VideoStudy.Shared.Services.PersistenceService PersistenceService
@using VideoStudy.Shared
@using System.Diagnostics

<div class="container-fluid py-4">
    <div class="d-flex justify-content-between align-items-center mb-4">
        <h2 class="fw-bold text-dark">📚 Minha Biblioteca</h2>
        @if (!string.IsNullOrEmpty(currentFolder))
        {
            <button class="btn btn-outline-secondary" @onclick="GoBack">
                ⬅️ Voltar
            </button>
        }
    </div>

    @if (string.IsNullOrEmpty(currentFolder))
    {
        <!-- MODO PASTAS -->
        <div class="row g-3">
            <!-- Pasta Geral (Padrão) -->
            <div class="col-md-3">
                <div class="card h-100 shadow-sm folder-card" @onclick='() => OpenFolder("Geral")'>
                    <div class="card-body text-center p-4">
                        <div class="display-1 mb-2">📁</div>
                        <h5 class="fw-bold">Geral</h5>
                        <small class="text-muted">@GetCount("Geral") arquivos</small>
                    </div>
                </div>
            </div>

            <!-- Outras Pastas do Disco -->
            @foreach (var folder in folders)
            {
                if (folder == "Geral") continue; 
                <div class="col-md-3">
                    <div class="card h-100 shadow-sm folder-card" @onclick='() => OpenFolder(folder)'>
                        <div class="card-body text-center p-4">
                            <div class="display-1 mb-2">📁</div>
                            <h5 class="fw-bold">@folder</h5>
                            <small class="text-muted">@GetCount(folder) arquivos</small>
                        </div>
                    </div>
                </div>
            }
        </div>
    }
    else
    {
        <!-- MODO ARQUIVOS (DENTRO DA PASTA) -->
        <h5 class="mb-3 text-muted">Pasta: <strong>@currentFolder</strong></h5>
        
        <div class="list-group shadow-sm">
            @foreach (var session in currentSessions)
            {
                <div class="list-group-item list-group-item-action d-flex align-items-center p-3">
                    <div class="me-3 fs-1">📄</div>
                    <div class="flex-grow-1">
                        <h6 class="mb-1 fw-bold">@session.Title</h6>
                        <small class="text-muted">
                            📅 @session.CreatedAt.ToString("g") • 
                            <span class="text-truncate d-inline-block" style="max-width: 300px;">@session.FilePath</span>
                        </small>
                    </div>
                    <button class="btn btn-primary btn-sm px-4 fw-bold" @onclick="() => OpenPdf(session.FilePath)">
                        Abrir PDF ↗️
                    </button>
                </div>
            }

            @if (!currentSessions.Any())
            {
                <div class="text-center p-5 text-muted">
                    <h5>Esta pasta está vazia 🕸️</h5>
                </div>
            }
        </div>
    }
</div>

<style>
    .folder-card {
        cursor: pointer;
        transition: transform 0.2s, box-shadow 0.2s;
        border: none;
        background: #f8f9fa;
    }
    .folder-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0,0,0,0.1) !important;
        background: #fff;
        border: 1px solid #dee2e6;
    }
</style>

@code {
    private List<string> folders = new();
    private List<VideoStudySession> allSessions = new();
    private List<VideoStudySession> currentSessions = new();
    private string? currentFolder = null;

    protected override void OnInitialized()
    {
        LoadData();
    }

    private void LoadData()
    {
        // Ler estrutura física e banco
        folders = PersistenceService.GetFolders();
        if (!folders.Contains("Geral")) folders.Insert(0, "Geral"); // Garantir Geral
        
        allSessions = PersistenceService.GetAllSessions();
    }

    private int GetCount(string folder)
    {
        return allSessions.Count(s => s.FolderName == folder);
    }

    private void OpenFolder(string folderName)
    {
        currentFolder = folderName;
        currentSessions = allSessions.Where(s => s.FolderName == folderName).ToList();
    }

    private void GoBack()
    {
        currentFolder = null;
    }

    private void OpenPdf(string path)
    {
        try
        {
            if (File.Exists(path))
            {
                new Process
                {
                    StartInfo = new ProcessStartInfo(path) { UseShellExecute = true }
                }.Start();
            }
        }
        catch 
        {
            // Tratamento simples, idealmente mostraria um toast
        }
    }
}