@page "/accounts"
@attribute [Authorize]
@inject AccountService AccountService
@inject AuthenticationStateProvider AuthStateProvider
@inject AppState AppState
@rendermode InteractiveServer

<PageTitle>Accounts</PageTitle>

<h3 class="mb-2">Accounts</h3>
<p class="text-muted mb-4">Manage your financial accounts, balances and currencies.</p>

<div class="card mb-4">
    <div class="card-header">
        <h5 class="mb-0">Add Account</h5>
    </div>
    <div class="card-body">
        <EditForm Model="formModel" OnValidSubmit="AddAccount" FormName="addAccount">
            <ToastValidator />
            <div class="row g-3 align-items-end">
                <div class="col-md-3">
                    <label class="form-label">Account Name</label>
                    <InputText @bind-Value="formModel.Name" class="form-control" placeholder="e.g. Current Account" title="A friendly name for this account" />
                </div>
                <div class="col-md-2">
                    <label class="form-label">Current Balance</label>
                    <InputNumber @bind-Value="formModel.CurrentBalance" class="form-control numeric-input" title="The opening balance for this account" />
                </div>
                <div class="col-md-2">
                    <label class="form-label">Currency</label>
                    <InputSelect @bind-Value="formModel.CurrencyCode" class="form-select" title="Currency used for this account">
                        @foreach (var kvp in Account.CurrencySymbols)
                        {
                            <option value="@kvp.Key">@kvp.Key (@kvp.Value)</option>
                        }
                    </InputSelect>
                </div>
                <div class="col-md-2">
                    <label class="form-label">Colour</label>
                    <InputText @bind-Value="formModel.Color" type="color" class="form-control form-control-color" title="Colour used to identify this account in charts and lists" />
                </div>
                <div class="col-md-2">
                    <button type="submit" class="btn btn-primary w-100">Add</button>
                </div>
            </div>
        </EditForm>
    </div>
</div>

@if (accounts is null)
{
    <p><em>Loading...</em></p>
}
else if (accounts.Count == 0)
{
    <div class="alert alert-info">No accounts yet. Add one above to get started.</div>
}
else
{
    <div class="row">
        @foreach (var account in accounts)
        {
            <div class="col-md-4 col-sm-6 mb-3">
                <div class="card h-100" style="border-left: 4px solid @account.Color;">
                    <div class="card-body">
                        @if (editingAccountId == account.Id)
                        {
                            <div class="mb-2">
                                <label class="form-label form-label-sm mb-1">Name</label>
                                <input type="text" class="form-control form-control-sm" @bind="editName" />
                            </div>
                            <div class="mb-2">
                                <label class="form-label form-label-sm mb-1">Currency</label>
                                <select class="form-select form-select-sm" @bind="editCurrencyCode">
                                    @foreach (var kvp in Account.CurrencySymbols)
                                    {
                                        <option value="@kvp.Key">@kvp.Key (@kvp.Value)</option>
                                    }
                                </select>
                            </div>
                            <div class="mb-2">
                                <label class="form-label form-label-sm mb-1">Colour</label>
                                <input type="color" class="form-control form-control-color form-control-sm" @bind="editColor" />
                            </div>
                            <div class="d-flex gap-1">
                                <button class="btn btn-success btn-sm" @onclick="() => SaveAccountDetails(account.Id)">Save</button>
                                <button class="btn btn-secondary btn-sm" @onclick="CancelAccountEdit">Cancel</button>
                            </div>
                        }
                        else
                        {
                            <div class="d-flex justify-content-between align-items-start">
                                <div>
                                    <h5 class="card-title mb-1">@account.Name</h5>
                                    <small class="text-muted">@account.CurrencyCode</small>
                                </div>
                                <div class="d-flex gap-1">
                                    <button class="btn btn-outline-primary btn-sm" title="Edit account name, currency or colour" @onclick="() => StartAccountEdit(account)">Edit</button>
                                    <button class="btn btn-outline-danger btn-sm" title="Delete this account and all its transactions" @onclick="() => ConfirmDeleteAccount(account)">Delete</button>
                                </div>
                            </div>

                            @if (editingBalanceAccountId == account.Id)
                            {
                                <div class="mt-2">
                                    <div class="input-group input-group-sm">
                                        <span class="input-group-text">@account.GetSymbol()</span>
                                        <input type="number" class="form-control numeric-input" step="0.01"
                                               @bind="editingBalanceValue" />
                                    </div>
                                    <div class="d-flex gap-1 mt-2">
                                        <button class="btn btn-success btn-sm flex-fill" @onclick="() => SaveBalance(account.Id)">Save</button>
                                        <button class="btn btn-outline-secondary btn-sm flex-fill" @onclick="CancelBalanceEdit">Cancel</button>
                                    </div>
                                </div>
                            }
                            else
                            {
                                <h4 class="@(account.CurrentBalance >= 0 ? "text-success" : "text-danger") mb-1"
                                    style="cursor: pointer;" title="Click to edit balance"
                                    @onclick="() => StartBalanceEdit(account)">
                                    @account.FormatAmount(account.CurrentBalance)
                                </h4>
                                <small class="text-muted">Click balance to adjust</small>
                            }
                        }
                    </div>
                </div>
            </div>
        }
    </div>
}

@if (showDeleteModal && pendingDeleteAccount is not null)
{
    <div class="modal d-block" tabindex="-1" style="background: rgba(0,0,0,.5);">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">Delete Account</h5>
                    <button type="button" class="btn-close" @onclick="CancelDeleteAccount"></button>
                </div>
                <div class="modal-body">
                    <p>Are you sure you want to delete <strong>@pendingDeleteAccount.Name</strong>?</p>
                    <p class="text-danger mb-0">This will permanently remove the account and all its transactions.</p>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" @onclick="CancelDeleteAccount">Cancel</button>
                    <button type="button" class="btn btn-danger" @onclick="DeleteAccountConfirmed">Delete</button>
                </div>
            </div>
        </div>
    </div>
}

@code {
    private List<Account>? accounts;
    private AccountForm formModel = new();
    private string? userId;

    // Balance editing state
    private int? editingBalanceAccountId;
    private decimal editingBalanceValue;

    // Account details editing state
    private int? editingAccountId;
    private string editName = string.Empty;
    private string editColor = "#1b6ec2";
    private string editCurrencyCode = "GBP";

    // Delete confirmation state
    private bool showDeleteModal;
    private Account? pendingDeleteAccount;

    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthStateProvider.GetAuthenticationStateAsync();
        userId = authState.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
        await LoadAccounts();
    }

    private async Task LoadAccounts()
    {
        if (userId is not null)
        {
            accounts = await AccountService.GetAccountsAsync(userId);
        }
    }

    private async Task AddAccount()
    {
        if (userId is null) return;

        var account = new Account
        {
            Name = formModel.Name,
            CurrentBalance = formModel.CurrentBalance,
            Color = formModel.Color,
            CurrencyCode = formModel.CurrencyCode,
            UserId = userId
        };
        await AccountService.CreateAccountAsync(account);
        formModel = new AccountForm();
        await LoadAccounts();
        AppState.NotifyAccountsChanged();
    }

    private void ConfirmDeleteAccount(Account account)
    {
        pendingDeleteAccount = account;
        showDeleteModal = true;
    }

    private async Task DeleteAccountConfirmed()
    {
        if (userId is null || pendingDeleteAccount is null) return;

        showDeleteModal = false;
        await AccountService.DeleteAccountAsync(pendingDeleteAccount.Id, userId);
        pendingDeleteAccount = null;
        await LoadAccounts();
        AppState.NotifyAccountsChanged();
    }

    private void CancelDeleteAccount()
    {
        showDeleteModal = false;
        pendingDeleteAccount = null;
    }

    private void StartBalanceEdit(Account account)
    {
        editingBalanceAccountId = account.Id;
        editingBalanceValue = account.CurrentBalance;
    }

    private void CancelBalanceEdit()
    {
        editingBalanceAccountId = null;
    }

    private async Task SaveBalance(int accountId)
    {
        if (userId is null) return;

        await AccountService.UpdateBalanceAsync(accountId, userId, editingBalanceValue);
        editingBalanceAccountId = null;
        await LoadAccounts();
        AppState.NotifyAccountsChanged();
    }

    private void StartAccountEdit(Account account)
    {
        editingAccountId = account.Id;
        editName = account.Name;
        editColor = account.Color;
        editCurrencyCode = account.CurrencyCode;
    }

    private void CancelAccountEdit()
    {
        editingAccountId = null;
    }

    private async Task SaveAccountDetails(int accountId)
    {
        if (userId is null) return;

        await AccountService.UpdateAccountDetailsAsync(accountId, userId, editName, editColor, editCurrencyCode);
        editingAccountId = null;
        await LoadAccounts();
        AppState.NotifyAccountsChanged();
    }

    private sealed class AccountForm
    {
        [System.ComponentModel.DataAnnotations.Required(ErrorMessage = "Account name is required")]
        [System.ComponentModel.DataAnnotations.MaxLength(100)]
        public string Name { get; set; } = string.Empty;

        public decimal CurrentBalance { get; set; }

        [System.ComponentModel.DataAnnotations.Required]
        [System.ComponentModel.DataAnnotations.MaxLength(7)]
        public string Color { get; set; } = "#1b6ec2";

        [System.ComponentModel.DataAnnotations.Required]
        [System.ComponentModel.DataAnnotations.MaxLength(3)]
        public string CurrencyCode { get; set; } = "GBP";
    }
}