@page "/users"
@implements IDisposable

<PageTitle>Users Management - Chrono DB</PageTitle>

<div class="d-flex align-items-center justify-content-between mb-4">
    <div>
        <h2 class="fw-bold mb-1 text-white">Users Database (`User`)</h2>
        <p class="text-secondary mb-0">Browse, add, edit credentials, and delete user accounts.</p>
    </div>
    <div class="d-flex gap-2">
        <button class="btn btn-chrono-secondary" @onclick="LoadUsersAsync">
            <i class="bi bi-arrow-clockwise"></i> Refresh
        </button>
        <button class="btn btn-chrono-primary" @onclick="OpenAddModal">
            <i class="bi bi-plus-lg"></i> Add New User
        </button>
    </div>
</div>

@if (!string.IsNullOrEmpty(alertMessage))
{
    <div class="alert @(alertIsSuccess ? "alert-success" : "alert-danger") alert-dismissible fade show" role="alert">
        <i class="bi @(alertIsSuccess ? "bi-check-circle-fill" : "bi-exclamation-triangle-fill") me-2"></i>
        @alertMessage
        <button type="button" class="btn-close" @onclick="() => alertMessage = null"></button>
    </div>
}

<div class="chrono-card">
    <div class="d-flex align-items-center justify-content-between mb-3 gap-3">
        <div class="input-group" style="max-width: 400px;">
            <span class="input-group-text bg-dark border-secondary text-secondary"><i class="bi bi-search"></i></span>
            <input type="text" class="form-control form-control-chrono" placeholder="Search by username..."
                   @bind="searchTerm" @bind:event="oninput" @bind:after="FilterUsers"/>
            @if (!string.IsNullOrEmpty(searchTerm))
            {
                <button class="btn btn-outline-secondary" @onclick="ClearSearch"><i class="bi bi-x-lg"></i></button>
            }
        </div>

        <div class="text-secondary small">
            Showing @users.Count user(s)
        </div>
    </div>

    @if (isLoading)
    {
        <div class="text-center py-5 text-secondary">
            <div class="spinner-border text-primary mb-2" role="status"></div>
            <div>Loading users from database...</div>
        </div>
    }
    else if (!users.Any())
    {
        <div class="text-center py-5 text-secondary">
            <i class="bi bi-people fs-1 d-block mb-2"></i>
            <h5>No Users Found</h5>
            <p class="small">There are currently no users in the database.</p>
            <div class="d-flex justify-content-center gap-2 mt-3">
                <button class="btn btn-chrono-primary" @onclick="OpenAddModal">
                    <i class="bi bi-plus-lg"></i> Add First User
                </button>
                <button class="btn btn-chrono-secondary" @onclick="SeedUsersAsync">
                    <i class="bi bi-box-arrow-in-down"></i> Seed Sample Users
                </button>
            </div>
        </div>
    }
    else
    {
        <div class="table-responsive">
            <table class="chrono-table">
                <thead>
                <tr>
                    <th style="width: 30%;">Username (Primary Key)</th>
                    <th style="width: 35%;">Password Hash / Credential</th>
                    <th style="width: 20%;">Created At</th>
                    <th style="width: 140px;" class="text-end">Actions</th>
                </tr>
                </thead>
                <tbody>
                @foreach (var user in users)
                {
                    <tr>
                        <td>
                            <div class="fw-semibold text-white d-flex align-items-center gap-2">
                                <i class="bi bi-person-circle text-info"></i>
                                @user.Username
                            </div>
                        </td>
                        <td>
                            <div class="text-secondary font-monospace">••••••••</div>
                        </td>
                        <td>
                            <div class="text-secondary small">@user.CreatedAt.ToString("g")</div>
                        </td>
                        <td class="text-end">
                            <div class="btn-group btn-group-sm">
                                <button class="btn btn-chrono-secondary" @onclick="() => OpenEditModal(user)"
                                        title="Edit Password">
                                    <i class="bi bi-pencil-fill"></i>
                                </button>
                                <button class="btn btn-chrono-danger" @onclick="() => OpenDeleteModal(user)"
                                        title="Delete User">
                                    <i class="bi bi-trash3-fill"></i>
                                </button>
                            </div>
                        </td>
                    </tr>
                }
                </tbody>
            </table>
        </div>
    }
</div>

@if (showEditModal)
{
    <div class="modal-backdrop-custom">
        <div class="modal-dialog-custom">
            <div class="modal-header-custom">
                <h5 class="modal-title-custom">
                    <i class="bi @(isNewUser ? "bi-person-plus-fill" : "bi-pencil-square") me-2 text-primary"></i>
                    @(isNewUser ? "Add New User" : $"Edit User: {currentUser.Username}")
                </h5>
                <button type="button" class="btn-close btn-close-white" @onclick="CloseModal"></button>
            </div>
            <div class="modal-body-custom">
                <div class="mb-3">
                    <label class="form-label text-secondary small fw-semibold">USERNAME</label>
                    <input type="text" class="form-control form-control-chrono"
                           @bind="currentUser.Username" disabled="@(!isNewUser)"
                           placeholder="e.g. player1"/>
                </div>
                <div class="mb-3">
                    <label class="form-label text-secondary small fw-semibold">PASSWORD</label>
                    <input type="password" class="form-control form-control-chrono"
                           @bind="currentUser.Password"
                           placeholder="Enter password..."/>
                </div>
            </div>
            <div class="modal-footer-custom">
                <button type="button" class="btn btn-chrono-secondary" @onclick="CloseModal">Cancel</button>
                <button type="button" class="btn btn-chrono-primary" @onclick="SaveUserAsync" disabled="@isSaving">
                    <i class="bi bi-save me-1"></i> @(isSaving ? "Saving..." : "Save User")
                </button>
            </div>
        </div>
    </div>
}

@if (showDeleteModal && userToDelete != null)
{
    <div class="modal-backdrop-custom">
        <div class="modal-dialog-custom" style="max-width: 450px;">
            <div class="modal-header-custom">
                <h5 class="modal-title-custom text-danger">
                    <i class="bi bi-exclamation-triangle-fill me-2"></i> Confirm Delete
                </h5>
                <button type="button" class="btn-close btn-close-white"
                        @onclick="() => showDeleteModal = false"></button>
            </div>
            <div class="modal-body-custom">
                <p class="text-light mb-0">
                    Are you sure you want to delete user <strong class="text-white">@userToDelete.Username</strong>?
                </p>
            </div>
            <div class="modal-footer-custom">
                <button type="button" class="btn btn-chrono-secondary" @onclick="() => showDeleteModal = false">
                    Cancel
                </button>
                <button type="button" class="btn btn-chrono-danger" @onclick="ConfirmDeleteAsync"
                        disabled="@isSaving">
                    <i class="bi bi-trash3-fill me-1"></i> @(isSaving ? "Deleting..." : "Delete")
                </button>
            </div>
        </div>
    </div>
}

@code {
    private List<User> users = [];
    private bool isLoading = true;
    private bool isSaving;
    private string searchTerm = string.Empty;

    private bool showEditModal;
    private bool isNewUser;
    private User currentUser = new();

    private bool showDeleteModal;
    private User? userToDelete;

    private string? alertMessage;
    private bool alertIsSuccess;

    protected override async Task OnInitializedAsync()
    {
        ConfigService.OnConfigurationChanged += HandleConfigChanged;
        await LoadUsersAsync();
    }

    private async void HandleConfigChanged()
    {
        await InvokeAsync(LoadUsersAsync);
    }

    private async Task LoadUsersAsync()
    {
        isLoading = true;
        alertMessage = null;
        try
        {
            users = await DbService.GetUsersAsync(searchTerm);
        }
        catch (Exception ex)
        {
            alertMessage = $"Error loading users: {ex.Message}";
            alertIsSuccess = false;
        }
        finally
        {
            isLoading = false;
            StateHasChanged();
        }
    }

    private async Task FilterUsers()
    {
        users = await DbService.GetUsersAsync(searchTerm);
    }

    private async Task ClearSearch()
    {
        searchTerm = string.Empty;
        await LoadUsersAsync();
    }

    private void OpenAddModal()
    {
        currentUser = new User();
        isNewUser = true;
        showEditModal = true;
    }

    private void OpenEditModal(User user)
    {
        currentUser = new User
        {
            Username = user.Username,
            Password = user.Password,
            CreatedAt = user.CreatedAt
        };
        isNewUser = false;
        showEditModal = true;
    }

    private void CloseModal()
    {
        showEditModal = false;
    }

    private async Task SaveUserAsync()
    {
        if (string.IsNullOrWhiteSpace(currentUser.Username) || string.IsNullOrWhiteSpace(currentUser.Password))
        {
            alertMessage = "Username and password cannot be empty.";
            alertIsSuccess = false;
            return;
        }

        isSaving = true;
        try
        {
            var result = await DbService.SaveUserAsync(currentUser, isNewUser);
            alertMessage = result.Message;
            alertIsSuccess = result.Success;
            if (result.Success)
            {
                showEditModal = false;
                await LoadUsersAsync();
            }
        }
        finally
        {
            isSaving = false;
        }
    }

    private void OpenDeleteModal(User user)
    {
        userToDelete = user;
        showDeleteModal = true;
    }

    private async Task ConfirmDeleteAsync()
    {
        if (userToDelete == null) return;

        isSaving = true;
        try
        {
            var result = await DbService.DeleteUserAsync(userToDelete.Username);
            alertMessage = result.Message;
            alertIsSuccess = result.Success;
            showDeleteModal = false;
            userToDelete = null;
            await LoadUsersAsync();
        }
        finally
        {
            isSaving = false;
        }
    }

    private async Task SeedUsersAsync()
    {
        isLoading = true;
        try
        {
            var res = await DbService.SeedSampleDataAsync();
            alertMessage = res.Message;
            alertIsSuccess = res.Success;
            await LoadUsersAsync();
        }
        finally
        {
            isLoading = false;
        }
    }

    public void Dispose()
    {
        ConfigService.OnConfigurationChanged -= HandleConfigChanged;
    }

}