using Bunit;
using Microsoft.AspNetCore.Components;
using Microsoft.Extensions.DependencyInjection;
using SilverOS.Welcome.App.Components;
using SilverOS.Welcome.App.Components.Steps;
using Xunit;

public class AccountStepTests : TestContext
{
    // Helper: register WizardState and render AccountStep with an OnValidityChanged capture.
    private (IRenderedComponent<AccountStep> cut, Func<bool?> lastValidity) RenderStep(WizardState? state = null)
    {
        var wizardState = state ?? new WizardState();
        Services.AddSingleton(wizardState);

        bool? captured = null;
        var cut = RenderComponent<AccountStep>(p =>
            p.Add(s => s.OnValidityChanged,
                  EventCallback.Factory.Create<bool>(this, v => captured = v)));

        return (cut, () => captured);
    }

    [Fact]
    public void OnValidityChanged_fires_false_on_initial_mount_with_empty_fields()
    {
        var (_, lastValidity) = RenderStep();

        Assert.NotNull(lastValidity());
        Assert.False(lastValidity(), "Step should be invalid on first mount (empty fields).");
    }

    [Fact]
    public void OnValidityChanged_fires_true_after_all_valid_inputs_are_entered()
    {
        var (cut, lastValidity) = RenderStep();

        // Simulate user filling in all four fields.
        cut.Find("#username").Input("alice");
        cut.Find("#password").Input("Secret1!");
        cut.Find("#adminpassword").Input("Admin1!");
        cut.Find("#bitlockerpin").Input("123456");

        Assert.True(lastValidity(), "Step should be valid after all fields are correctly filled.");
    }

    [Fact]
    public void OnValidityChanged_fires_false_when_a_field_is_cleared_after_being_valid()
    {
        var (cut, lastValidity) = RenderStep();

        cut.Find("#username").Input("alice");
        cut.Find("#password").Input("Secret1!");
        cut.Find("#adminpassword").Input("Admin1!");
        cut.Find("#bitlockerpin").Input("123456");

        Assert.True(lastValidity()); // sanity

        // Clear a required field — must revert to invalid.
        cut.Find("#username").Input("");

        Assert.False(lastValidity(), "Step should become invalid again when a required field is cleared.");
    }

    [Fact]
    public void OnValidityChanged_fires_false_when_pin_is_non_numeric_or_too_short()
    {
        var (cut, lastValidity) = RenderStep();

        cut.Find("#username").Input("alice");
        cut.Find("#password").Input("Secret1!");
        cut.Find("#adminpassword").Input("Admin1!");

        // Too short — 5 digits.
        cut.Find("#bitlockerpin").Input("12345");
        Assert.False(lastValidity(), "PIN with only 5 digits must be invalid.");

        // Non-numeric.
        cut.Find("#bitlockerpin").Input("abc123");
        Assert.False(lastValidity(), "Non-numeric PIN must be invalid.");

        // Exactly 6 digits — valid.
        cut.Find("#bitlockerpin").Input("123456");
        Assert.True(lastValidity(), "Exactly 6 numeric digits is valid.");
    }

    [Fact]
    public void OnValidityChanged_fires_true_on_mount_when_wizard_state_already_populated()
    {
        var prefilledState = new WizardState
        {
            Username = "alice",
            Password = "Secret1!",
            AdminPassword = "Admin1!",
            BitLockerPin = "123456"
        };

        var (_, lastValidity) = RenderStep(prefilledState);

        Assert.True(lastValidity(),
            "Step should fire valid=true on mount when WizardState already has valid values (Back→Forward re-mount).");
    }
}