@page "/Borrowings/Manage"
@using BlazorFrontend.Services
@using LibraryManagement.Shared.Models
@using Microsoft.AspNetCore.Authorization
@inject LibraryApiClient ApiClient
@inject IJSRuntime JS
@attribute [Authorize(Roles = "Librarian")]

<PageTitle>Manage Borrowings</PageTitle>

<div class="mb-10 animate-in fade-in slide-in-from-top-4 duration-500">
    <div class="flex items-center justify-between mb-4">
        <div>
            <h1 class="text-3xl font-extrabold tracking-tight text-mystic-900 border-b border-mystic-100 pb-4 mb-2">Manage All Borrowings</h1>
            <p class="text-mystic-500 font-medium">Monitor and process library loans across all members.</p>
        </div>
        <div class="flex gap-3">
            <div class="card px-4 py-2 flex items-center gap-2 bg-mystic-50 border-mystic-200">
                <span class="text-xs font-bold text-mystic-400 uppercase tracking-widest">Total Active:</span>
                <span class="text-lg font-bold text-mystic-900">@_borrowings.Count(m => m.Status == "Borrowed")</span>
            </div>
        </div>
    </div>
</div>

@if (_isLoading)
{
    <div class="py-20 flex justify-center">
        <div class="animate-spin rounded-full h-10 w-10 border-b-2 border-mystic-900"></div>
    </div>
}
else
{
    <div class="card overflow-hidden animate-in fade-in slide-in-from-bottom-4 duration-700">
        <div class="overflow-x-auto">
            <table class="w-full text-left border-collapse">
                <thead>
                    <tr class="bg-mystic-50 border-b border-mystic-200">
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest">Book & Loan Info</th>
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest">Member Details</th>
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest">Loan Dates</th>
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest text-center">Status</th>
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest">Fines</th>
                        <th class="px-6 py-4 text-[10px] font-bold text-mystic-400 uppercase tracking-widest text-right">Actions</th>
                    </tr>
                </thead>
                <tbody class="divide-y divide-mystic-100">
                    @if (!_borrowings.Any())
                    {
                        <tr>
                            <td colspan="6" class="px-6 py-16 text-center text-mystic-400 italic bg-white">
                                No borrowing records found in the system.
                            </td>
                        </tr>
                    }
                    @foreach (var loan in PaginatedBorrowings)
                    {
                        <tr class="hover:bg-mystic-50/80 transition-colors">
                            <td class="px-6 py-5">
                                <div class="flex items-center gap-4">
                                    <div class="w-10 h-14 bg-mystic-900/5 rounded-lg flex items-center justify-center text-mystic-400 border border-mystic-100">
                                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18 18.246 18.477 16.5 18c-1.746 0-3.332.477-4.5 1.253"></path></svg>
                                    </div>
                                    <div class="min-w-0">
                                        <p class="text-sm font-bold text-mystic-900 truncate mb-0.5">@loan.BookTitle</p>
                                        <p class="text-[10px] font-mono text-mystic-400 uppercase tracking-tight">ID: #@loan.Id</p>
                                    </div>
                                </div>
                            </td>
                            <td class="px-6 py-5">
                                <div class="flex flex-col gap-1">
                                    <p class="text-sm font-semibold text-mystic-800">@loan.UserEmail</p>
                                    <p class="text-[10px] text-mystic-500 font-medium tracking-wide">UID: #@loan.UserId</p>
                                </div>
                            </td>
                            <td class="px-6 py-5">
                                <div class="grid gap-1">
                                    <div class="flex items-center gap-2 text-[11px]">
                                        <span class="text-mystic-400 w-12">Out:</span>
                                        <span class="font-bold text-mystic-700">@loan.BorrowDate.ToString("MMM dd, yyyy")</span>
                                    </div>
                                    <div class="flex items-center gap-2 text-[11px]">
                                        <span class="text-mystic-400 w-12">Due:</span>
                                        @{
                                            var isOverdue = loan.DueDate < DateTime.Now && loan.Status == "Borrowed";
                                        }
                                        <span class="font-bold @(isOverdue ? "text-rose-600 animate-pulse" : "text-amber-700")">@loan.DueDate.ToString("MMM dd, yyyy")</span>
                                    </div>
                                    @if (loan.ReturnDate.HasValue)
                                    {
                                        <div class="flex items-center gap-2 text-[11px]">
                                            <span class="text-mystic-400 w-12">Back:</span>
                                            <span class="font-bold text-emerald-600">@loan.ReturnDate.Value.ToString("MMM dd, yyyy")</span>
                                        </div>
                                    }
                                </div>
                            </td>
                            <td class="px-6 py-5 text-center">
                                <span class="inline-flex items-center px-3 py-1 rounded-full text-[10px] font-bold uppercase tracking-wider
                                    @(loan.Status == "Borrowed" ? "bg-amber-100 text-amber-700" : 
                                      loan.Status == "PendingReturn" ? "bg-blue-600 text-white shadow-sm" :
                                      "bg-emerald-100 text-emerald-700")">
                                    @(loan.Status == "PendingReturn" ? "Pending Approval" : loan.Status)
                                </span>
                            </td>
                            <td class="px-6 py-5">
                                @if (loan.FineAmount > 0)
                                {
                                    <div class="flex flex-col">
                                        <span class="text-sm font-extrabold @(loan.IsFinePaid ? "text-mystic-400 line-through" : "text-rose-600")">
                                            MMK @loan.FineAmount.ToString("N0")
                                        </span>
                                        @if (loan.IsFinePaid)
                                        {
                                            <span class="text-[9px] text-emerald-600 font-bold uppercase mt-0.5 tracking-tighter">Settled</span>
                                        }
                                        else
                                        {
                                            <span class="text-[9px] text-rose-400 font-bold uppercase mt-0.5 tracking-tighter">Pending</span>
                                        }
                                    </div>
                                }
                                else
                                {
                                    <span class="text-[10px] text-mystic-300 font-bold italic">No Fines</span>
                                }
                            </td>
                            <td class="px-6 py-5 text-right">
                                @if (loan.Status == "PendingReturn")
                                {
                                    <button @onclick="() => ApproveReturnAsync(loan)" 
                                            class="inline-flex items-center gap-2 bg-emerald-600 text-white px-4 py-2 rounded-lg text-xs font-bold hover:bg-emerald-700 transition-all shadow-md active:scale-95">
                                        <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M5 13l4 4L19 7"></path></svg>
                                        Approve Return
                                    </button>
                                }
                                else if (loan.Status == "Borrowed")
                                {
                                    <button @onclick="() => ForceReturnAsync(loan)"
                                            class="inline-flex items-center gap-2 bg-mystic-900 text-white px-4 py-2 rounded-lg text-xs font-bold hover:bg-mystic-800 transition-all shadow-sm active:scale-95">
                                        Process Return
                                    </button>
                                }
                                else
                                {
                                    <div class="text-emerald-600">
                                        <svg class="w-6 h-6 ml-auto" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2.5" d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z"></path></svg>
                                    </div>
                                }
                            </td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>

        @if (TotalPages > 1)
        {
            <div class="p-6 bg-mystic-900/5 border-t border-mystic-200 flex items-center justify-between">
                <p class="text-xs text-mystic-500 font-medium">
                    Showing <span class="font-bold text-mystic-900">@((_currentPage - 1) * _pageSize + 1)</span> to 
                    <span class="font-bold text-mystic-900">@(Math.Min(_currentPage * _pageSize, _borrowings.Count()))</span> of 
                    <span class="font-bold text-mystic-900">@_borrowings.Count()</span> records
                </p>
                <div class="flex items-center gap-2">
                    <button disabled="@(_currentPage == 1)" @onclick="() => _currentPage--" 
                            class="p-2 rounded-lg border border-mystic-200 text-mystic-600 hover:bg-white disabled:opacity-30 disabled:cursor-not-allowed transition-all">
                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"></path></svg>
                    </button>
                    
                    <span class="text-xs font-bold text-mystic-900 px-2 tracking-tight">Page @_currentPage of @TotalPages</span>

                    <button disabled="@(_currentPage == TotalPages)" @onclick="() => _currentPage++" 
                            class="p-2 rounded-lg border border-mystic-200 text-mystic-600 hover:bg-white disabled:opacity-30 disabled:cursor-not-allowed transition-all">
                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path></svg>
                    </button>
                </div>
            </div>
        }
    </div>
}

@code {
    private bool _isLoading = true;
    private IEnumerable<BorrowingDto> _borrowings = Enumerable.Empty<BorrowingDto>();

    // Pagination
    private int _currentPage = 1;
    private int _pageSize = 10;

    private IEnumerable<BorrowingDto> PaginatedBorrowings => _borrowings
        .OrderByDescending(l => l.BorrowDate)
        .Skip((_currentPage - 1) * _pageSize)
        .Take(_pageSize);

    private int TotalPages => (int)Math.Ceiling(_borrowings.Count() / (double)_pageSize);

    protected override async Task OnInitializedAsync()
    {
        await LoadDataAsync();
    }

    private async Task LoadDataAsync()
    {
        _isLoading = true;
        try
        {
            _borrowings = await ApiClient.GetAllBorrowingsAsync();
            _currentPage = 1;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error loading all borrowings: {ex.Message}");
        }
        finally
        {
            _isLoading = false;
        }
    }

    private async Task ApproveReturnAsync(BorrowingDto loan)
    {
        bool confirmed = await JS.InvokeAsync<bool>("confirm", $"Approve return for \"{loan.BookTitle}\" borrowed by {loan.UserEmail}?");
        if (!confirmed) return;

        var result = await ApiClient.ReturnBookAsync(loan.Id);
        if (result != null)
        {
            await JS.InvokeVoidAsync("showToast", "Return approved successfully!", "success");
            await LoadDataAsync();
        }
        else
        {
            await JS.InvokeVoidAsync("showToast", "Failed to approve return.", "error");
        }
    }

    private async Task ForceReturnAsync(BorrowingDto loan)
    {
        bool confirmed = await JS.InvokeAsync<bool>("confirm", $"Force process return for \"{loan.BookTitle}\" (Member: {loan.UserEmail})? Use this if the member returned the book in person.");
        if (!confirmed) return;

        var result = await ApiClient.ReturnBookAsync(loan.Id);
        if (result != null)
        {
            await JS.InvokeVoidAsync("showToast", "Book marked as returned!", "success");
            await LoadDataAsync();
        }
        else
        {
            await JS.InvokeVoidAsync("showToast", "Failed to process return.", "error");
        }
    }
}