@page "/design/external-systems/create"
@page "/design/external-systems/{Id:int}/edit"
@using ZB.MOM.WW.ScadaBridge.Security
@using ZB.MOM.WW.ScadaBridge.Commons.Entities.ExternalSystems
@using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories
@attribute [Authorize(Policy = AuthorizationPolicies.RequireDesign)]
@inject IExternalSystemRepository ExternalSystemRepository
@inject NavigationManager NavigationManager

<div class="container-fluid mt-3">
    <button class="btn btn-outline-secondary btn-sm mb-2" @onclick="GoBack">&larr; Back</button>

    <div class="d-flex justify-content-between align-items-center mb-3">
        <h4 class="mb-0">@(Id.HasValue ? "Edit External System" : "Add External System")</h4>
        @* Drill-in: deep-link into the central Audit Log
           pre-filtered to this external system's outbound API events. Audit rows
           record the target by external-system name, so we filter on Target. *@
        @if (Id.HasValue && !string.IsNullOrWhiteSpace(_name))
        {
            <a class="btn btn-outline-secondary btn-sm"
               href="/audit/log?target=@Uri.EscapeDataString(_name)"
               data-test="audit-link">
                Recent audit activity
            </a>
        }
    </div>

    @if (_loading)
    {
        <LoadingSpinner IsLoading="true" />
    }
    else
    {
        <div class="card">
            <div class="card-body">
                <div class="mb-3">
                    <label class="form-label">Name</label>
                    <input type="text" class="form-control" @bind="_name" />
                </div>
                <div class="mb-3">
                    <label class="form-label">Endpoint URL</label>
                    <input type="text" class="form-control" @bind="_endpointUrl" />
                </div>
                <div class="mb-3">
                    <label class="form-label">Auth Type</label>
                    <select class="form-select" @bind="_authType">
                        <option>ApiKey</option>
                        <option>BasicAuth</option>
                        <option>None</option>
                    </select>
                </div>
                <div class="mb-3">
                    <label class="form-label">Auth Config (JSON)</label>
                    <input type="text" class="form-control" @bind="_authConfig"
                           placeholder="@_authConfigPlaceholder" />
                </div>
                <div class="mb-3">
                    <label class="form-label">Max Retries</label>
                    <input type="number" class="form-control" @bind="_maxRetries" min="0" />
                </div>
                <div class="mb-3">
                    <label class="form-label">Retry Delay (seconds)</label>
                    <input type="number" class="form-control" @bind="_retryDelaySeconds" min="0" />
                </div>
                <div class="mb-3">
                    <label class="form-label">Timeout (seconds)</label>
                    <input type="number" class="form-control" @bind="_timeoutSeconds" min="0" />
                    <div class="form-text">0 = use gateway default</div>
                </div>

                @if (_formError != null)
                {
                    <div class="text-danger small mb-2">@_formError</div>
                }

                <div class="btn-group" role="group">
                    <button class="btn btn-success" @onclick="Save">Save</button>
                    <button class="btn btn-outline-secondary" @onclick="GoBack">Cancel</button>
                </div>
            </div>
        </div>
    }
</div>

@code {
    [Parameter] public int? Id { get; set; }

    private bool _loading = true;
    private string _name = "", _endpointUrl = "", _authType = "ApiKey";
    private string? _authConfig;
    private int _maxRetries = 3;
    private int _retryDelaySeconds = 5;
    private int _timeoutSeconds;
    private string? _formError;

    private ExternalSystemDefinition? _existing;

    // Per-AuthType placeholder that hints at the expected JSON shape for AuthConfig.
    private string _authConfigPlaceholder => _authType switch
    {
        "ApiKey" => "{\"key\":\"xyz\"}",
        "BasicAuth" => "{\"username\":\"u\",\"password\":\"p\"}",
        _ => "{}"
    };

    protected override async Task OnInitializedAsync()
    {
        if (Id.HasValue)
        {
            try
            {
                _existing = await ExternalSystemRepository.GetExternalSystemByIdAsync(Id.Value);
                if (_existing != null)
                {
                    _name = _existing.Name;
                    _endpointUrl = _existing.EndpointUrl;
                    _authType = _existing.AuthType;
                    _authConfig = _existing.AuthConfiguration;
                    _maxRetries = _existing.MaxRetries;
                    _retryDelaySeconds = (int)_existing.RetryDelay.TotalSeconds;
                    _timeoutSeconds = _existing.TimeoutSeconds;
                }
            }
            catch (Exception ex) { _formError = ex.Message; }
        }
        _loading = false;
    }

    private async Task Save()
    {
        _formError = null;
        if (string.IsNullOrWhiteSpace(_name) || string.IsNullOrWhiteSpace(_endpointUrl))
        {
            _formError = "Name and URL required.";
            return;
        }

        try
        {
            if (_existing != null)
            {
                _existing.Name = _name.Trim();
                _existing.EndpointUrl = _endpointUrl.Trim();
                _existing.AuthType = _authType;
                _existing.AuthConfiguration = _authConfig?.Trim();
                _existing.MaxRetries = _maxRetries;
                _existing.RetryDelay = TimeSpan.FromSeconds(_retryDelaySeconds);
                _existing.TimeoutSeconds = _timeoutSeconds;
                await ExternalSystemRepository.UpdateExternalSystemAsync(_existing);
            }
            else
            {
                var es = new ExternalSystemDefinition(_name.Trim(), _endpointUrl.Trim(), _authType)
                {
                    AuthConfiguration = _authConfig?.Trim(),
                    MaxRetries = _maxRetries,
                    RetryDelay = TimeSpan.FromSeconds(_retryDelaySeconds),
                    TimeoutSeconds = _timeoutSeconds
                };
                await ExternalSystemRepository.AddExternalSystemAsync(es);
            }
            await ExternalSystemRepository.SaveChangesAsync();
            NavigationManager.NavigateTo("/design/external-systems");
        }
        catch (Exception ex) { _formError = ex.Message; }
    }

    private void GoBack() => NavigationManager.NavigateTo("/design/external-systems");
}