using System.Net;
using MeterVault.App;
using MeterVault.App.Analysis;
using MeterVault.App.Components.Shared.Analysis;
using MeterVault.App.Theme;
using MeterVault.Core.Analysis;
using MeterVault.Core.Analysis.Coverage;
using MeterVault.Infrastructure.Analysis;
using MeterVault.Infrastructure.Options;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using Microsoft.JSInterop;
using MudBlazor.Services;
using static MeterVault.Integration.Tests.Analysis.AnalysisUiTestData;

namespace MeterVault.Integration.Tests.Analysis;

/// <summary>
/// The shared analysis components rendered to HTML with the framework's static <see cref="HtmlRenderer"/> (no bUnit, no
/// browser): they render with real MudBlazor services, the title is the page's h1, the toolbar shows the effective
/// dates, the table says "—" and speaks statuses, the empty and error states offer their actions, attention items link
/// to their fix. Static rendering proves the markup, not the interactive chart or navigation — those are covered by the
/// pure model tests and the manual checklist.
/// </summary>
public sealed class AnalysisComponentRenderTests
{
    [Fact]
    public async Task The_page_header_is_the_pages_h1_with_breadcrumbs_carrying_the_period()
    {
        var ytd = AnalysisQuery.Default(AnalysisDefaults.History.ForScope(QueryScope.ForMeter(5))).WithPeriod(PeriodPreset.YearToDate);
        RenderFragment crumbs = builder =>
        {
            builder.OpenComponent<AnalysisBreadcrumbs>(0);
            builder.AddComponentParameter(1, nameof(AnalysisBreadcrumbs.Query), ytd);
            builder.AddComponentParameter(2, nameof(AnalysisBreadcrumbs.EnergyTypeId), 1);
            builder.AddComponentParameter(3, nameof(AnalysisBreadcrumbs.EnergyTypeName), "Strom");
            builder.AddComponentParameter(4, nameof(AnalysisBreadcrumbs.MeterId), 5);
            builder.AddComponentParameter(5, nameof(AnalysisBreadcrumbs.MeterName), "Wärmepumpe <Keller>");
            builder.CloseComponent();
        };

        var raw = await RenderRawAsync<PageHeader>("en", new()
        {
            [nameof(PageHeader.Title)] = "Wärmepumpe <Keller>",
            [nameof(PageHeader.Description)] = "Heat pump",
            [nameof(PageHeader.Breadcrumbs)] = crumbs,
        });
        var html = WebUtility.HtmlDecode(raw);

        // User data is text, never markup; the title is the page's one h1.
        Assert.Contains("&lt;Keller&gt;</h1>", raw, StringComparison.Ordinal);
        Assert.Contains("<h1 class=\"mud-typography mud-typography-h4 mv-page-header__h1\">Wärmepumpe <Keller></h1>", html, StringComparison.Ordinal);
        Assert.Contains("href=\"/?period=ytd\"", html, StringComparison.Ordinal);
        Assert.Contains("href=\"/energy/1?period=ytd\"", html, StringComparison.Ordinal);
        Assert.Contains("<nav aria-label=\"Breadcrumbs\"", html, StringComparison.Ordinal);
        Assert.Contains("<span aria-current=\"page\">Wärmepumpe <Keller></span>", html, StringComparison.Ordinal);
        Assert.Single(System.Text.RegularExpressions.Regex.Matches(html, "<h1"));
    }

    [Fact]
    public async Task The_toolbar_shows_the_preset_with_its_effective_dates_and_a_refused_bucket()
    {
        var query = AnalysisQuery.Default(AnalysisDefaults.History).WithBucket(BucketSize.Day);
        var period = query.WithPeriod(PeriodPreset.Last24Months).Resolve(Now, Berlin);
        var plan = BucketPlanner.Plan(period, BucketSize.Day, maxPoints: AnalysisLimits.MaxPoints);
        Assert.True(plan.Refused);

        var html = await RenderAsync<PeriodToolbar>("de", new()
        {
            [nameof(PeriodToolbar.Query)] = query.WithPeriod(PeriodPreset.Last24Months),
            [nameof(PeriodToolbar.Period)] = period,
            [nameof(PeriodToolbar.Defaults)] = AnalysisDefaults.History,
            [nameof(PeriodToolbar.Plan)] = plan,
            [nameof(PeriodToolbar.ExportHref)] = "/export/analysis.csv?period=24m",
        });

        Assert.Contains("Letzte 24 Monate", html, StringComparison.Ordinal);
        Assert.Contains(In("de", () => Format.PeriodRange(period)), html, StringComparison.Ordinal);
        Assert.Contains("Das Intervall „Täglich“ bräuchte", html, StringComparison.Ordinal);
        Assert.Contains("„Wöchentlich“ verwenden", html, StringComparison.Ordinal);
        Assert.Contains("CSV exportieren", html, StringComparison.Ordinal);
        Assert.Contains("Zurücksetzen", html, StringComparison.Ordinal);
    }

    [Fact]
    public async Task The_toolbar_shows_notices_for_what_the_address_got_wrong()
    {
        var query = AnalysisQuery.Parse("?period=fortnight&bucket=hourly", AnalysisDefaults.History);

        var html = await RenderAsync<PeriodToolbar>("en", new() { [nameof(PeriodToolbar.Query)] = query });

        Assert.Equal(2, query.Notices.Count);
        foreach (var notice in query.Notices)
        {
            Assert.Contains(In("en", () => MeterVault.App.Localization.DisplayNames.Display(notice.Kind)), html, StringComparison.Ordinal);
        }

        Assert.DoesNotContain("fortnight", html, StringComparison.Ordinal);
    }

    [Fact]
    public async Task The_table_says_unknown_and_speaks_the_status()
    {
        var buckets = Buckets(D(2026, 1, 1), D(2026, 3, 31));
        var series = In("en", () => AnalysisTableSeries.ForSeries(Series(1, "Haus", [Available(120), Missing(), Available(0)])));

        var html = await RenderAsync<AnalysisTable>("en", new()
        {
            [nameof(AnalysisTable.Buckets)] = buckets,
            [nameof(AnalysisTable.Series)] = new[] { series },
            [nameof(AnalysisTable.DrillHref)] = (Func<AnalysisBucket, string?>)(b => "/drill/" + b.FirstDay.Month),
        });

        Assert.Contains("<th scope=\"row\" class=\"mv-row-label\">Feb</th>", html, StringComparison.Ordinal);
        Assert.Contains(">0 kWh", html, StringComparison.Ordinal);
        Assert.Contains("mv-unknown\">—", html, StringComparison.Ordinal);
        Assert.Contains("No data covers this period", html, StringComparison.Ordinal);
        Assert.Contains("href=\"/drill/2\"", html, StringComparison.Ordinal);
        Assert.Contains("aria-label=\"Details for Feb\"", html, StringComparison.Ordinal);
        Assert.Contains("role=\"region\"", html, StringComparison.Ordinal);
    }

    [Fact]
    public async Task A_metric_card_shows_words_instead_of_a_fabricated_zero()
    {
        var unknown = await RenderAsync<MetricCard>("en", new()
        {
            [nameof(MetricCard.Title)] = "Consumption",
            [nameof(MetricCard.Value)] = Missing(),
            [nameof(MetricCard.Unit)] = "kWh",
        });
        Assert.Contains("No data", unknown, StringComparison.Ordinal);
        Assert.DoesNotContain("0 kWh", unknown, StringComparison.Ordinal);

        var partial = await RenderAsync<MetricCard>("en", new()
        {
            [nameof(MetricCard.Title)] = "Consumption",
            [nameof(MetricCard.Value)] = Partial(12),
            [nameof(MetricCard.Unit)] = "kWh",
            [nameof(MetricCard.Change)] = Change.Between(12, 10),
            [nameof(MetricCard.Polarity)] = ChangePolarity.HigherIsWorse,
            [nameof(MetricCard.ChangeCaption)] = "vs. last year",
        });
        Assert.Contains("12 kWh", partial, StringComparison.Ordinal);
        Assert.Contains("Partial", partial, StringComparison.Ordinal);
        Assert.Contains("2.0 kWh more (+20.0 %)", partial, StringComparison.Ordinal);
        Assert.Contains("mv-change-bad", partial, StringComparison.Ordinal);
    }

    [Fact]
    public async Task Empty_pending_and_error_states_offer_their_way_on()
    {
        var empty = await RenderAsync<EmptyPeriodState>("de", new()
        {
            [nameof(EmptyPeriodState.Availability)] = new AvailableRange(Now, Now, D(2020, 1, 1), D(2023, 3, 15)),
            [nameof(EmptyPeriodState.LatestHref)] = "/meters/5?tab=analysis&from=2022-04-01&to=2023-03-31",
        });
        Assert.Contains("Keine Daten für diesen Zeitraum", empty, StringComparison.Ordinal);
        Assert.Contains("Zu den neuesten Daten", empty, StringComparison.Ordinal);
        Assert.Contains("from=2022-04-01", empty, StringComparison.Ordinal);

        var nothing = await RenderAsync<EmptyPeriodState>("en", []);
        Assert.Contains("No data yet", nothing, StringComparison.Ordinal);
        Assert.DoesNotContain("Go to latest data", nothing, StringComparison.Ordinal);

        var pending = await RenderAsync<PendingState>("en", []);
        Assert.Contains("Analysis being prepared", pending, StringComparison.Ordinal);

        var stale = await RenderAsync<PanelError>("en", new() { [nameof(PanelError.HasStaleValue)] = true });
        Assert.Contains("The figures shown are from the previous selection.", stale, StringComparison.Ordinal);

        var projection = await RenderAsync<ProjectionNote>("en", new() { [nameof(ProjectionNote.Days)] = 19, [nameof(ProjectionNote.ValueText)] = "320 kWh" });
        Assert.Contains("Projection (straight-line from 19 days): ≈ 320 kWh", projection, StringComparison.Ordinal);
    }

    [Fact]
    public async Task A_value_status_names_the_reason_and_the_source_it_misses()
    {
        var value = new BucketValue(null, BucketStatus.Missing, Provenance.Derived, ValueIssue.MissingSource, null, [9, 5]);

        var html = await RenderAsync<ValueStatus>("de", new()
        {
            [nameof(ValueStatus.Value)] = value,
            [nameof(ValueStatus.Inline)] = true,
            [nameof(ValueStatus.MeterName)] = (Func<int, string?>)(id => id == 5 ? "Solar 2" : null),
        });
        Assert.Contains("Keine Daten · Berechnet", html, StringComparison.Ordinal);
        Assert.Contains("Einem Quellzähler fehlen hier Daten (Solar 2)", html, StringComparison.Ordinal);

        // A plain complete value says nothing unless asked to.
        Assert.Equal(string.Empty, (await RenderAsync<ValueStatus>("en", new() { [nameof(ValueStatus.Value)] = Available(3) })).Trim());
        Assert.Contains("Complete · Measured", await RenderAsync<ValueStatus>("en", new()
        {
            [nameof(ValueStatus.Value)] = Available(3),
            [nameof(ValueStatus.ShowWhenComplete)] = true,
        }), StringComparison.Ordinal);
    }

    [Fact]
    public async Task A_comparison_summary_names_both_ranges_or_why_there_is_none()
    {
        var period = Range(D(2026, 1, 1), D(2026, 3, 31));

        var shown = await RenderAsync<ComparisonSummary>("en", new()
        {
            [nameof(ComparisonSummary.Period)] = period,
            [nameof(ComparisonSummary.Resolution)] = ComparisonResolver.Resolve(period, new ComparisonRequest(ComparisonKind.PreviousYear)),
            [nameof(ComparisonSummary.Matched)] = MatchedCoverageResult.NotComparable,
        });
        Assert.Contains("Jan 1 – Mar 31, 2026 compared with Jan 1 – Mar 31, 2025", shown, StringComparison.Ordinal);
        Assert.Contains("Not comparable", shown, StringComparison.Ordinal);

        var all = await RenderAsync<ComparisonSummary>("en", new()
        {
            [nameof(ComparisonSummary.Period)] = period,
            [nameof(ComparisonSummary.Resolution)] = new ComparisonResolution(ComparisonRequest.None, null, ComparisonUnavailableReason.AllHistory),
        });
        Assert.Contains("No comparison: All history has nothing before it to compare with.", all, StringComparison.Ordinal);
    }

    [Fact]
    public async Task Attention_items_render_with_their_actions_and_severity_words()
    {
        var html = await RenderAsync<AttentionList>("en", new()
        {
            [nameof(AttentionList.Problems)] = new[] { new AnalysisProblem(AnalysisProblemKind.StaleSource, 3) },
            [nameof(AttentionList.Names)] = new AttentionNames(new Dictionary<int, string> { [3] = "Solar 1" }),
        });

        Assert.Contains("Needs attention", html, StringComparison.Ordinal);
        Assert.Contains("Warning:", html, StringComparison.Ordinal);
        Assert.Contains("Solar 1: the live source has stopped delivering.", html, StringComparison.Ordinal);
        Assert.Contains("href=\"/meters/3?tab=sources\"", html, StringComparison.Ordinal);

        Assert.Equal(string.Empty, (await RenderAsync<AttentionList>("en", [])).Trim());
    }

    [Fact]
    public async Task Virtual_sources_show_the_formula_with_names_and_nested_sources_indented()
    {
        var nested = new SeriesContribution(7, "Solar 2", false, 1, [], [], Available(150), 150, [9, 8, 7], []);
        var inner = new SeriesContribution(8, "Dach", true, 1, [], [], Available(150), 150, [9, 8], [nested]);
        var first = new SeriesContribution(3, "Solar 1", false, 1, [], [], Available(100), 100, [9, 3], []);
        var series = Series(9, "Summe Solar", [Available(250)], kind: QuantityKind.Generation) with
        {
            Basis = SeriesBasis.Virtual,
            Contributions = [first, inner],
            Virtual = new VirtualSeriesInfo(VirtualMeterStatus.Valid, "m3 + m8", Core.Analysis.Virtual.VirtualCostRule.SourceCosts, [3, 8], [3, 7], [], null, null),
        };

        var html = await RenderAsync<SeriesContributions>("de", new() { [nameof(SeriesContributions.Series)] = series });

        Assert.Contains(">Solar 1</a>", html, StringComparison.Ordinal);
        Assert.Contains("<code>m3</code>", html, StringComparison.Ordinal);
        Assert.Contains("<code>m8</code>", html, StringComparison.Ordinal);
        // The nested source is indented with an invariant CSS number, even for a German reader.
        Assert.Contains("padding-left:2rem", html, StringComparison.Ordinal);
        Assert.Contains("· berechnet", html, StringComparison.Ordinal);
        Assert.Contains("href=\"/meters/7?tab=analysis\"", html, StringComparison.Ordinal);
        Assert.Contains("Kosten: Summe der Kosten der Quellen", html, StringComparison.Ordinal);
    }

    [Fact]
    public async Task The_chart_renders_its_container_or_says_there_is_nothing()
    {
        var buckets = Buckets(D(2026, 1, 1), D(2026, 2, 28));

        var none = await RenderAsync<AnalysisChart>("en", new()
        {
            [nameof(AnalysisChart.Buckets)] = buckets,
            [nameof(AnalysisChart.Series)] = new[] { new AnalysisChartSeries("m1", "Haus", "kWh", [Missing(), Missing()]) },
        });
        Assert.Contains("No data in this range.", none, StringComparison.Ordinal);

        var some = await RenderAsync<AnalysisChart>("en", new()
        {
            [nameof(AnalysisChart.Buckets)] = buckets,
            [nameof(AnalysisChart.Series)] = new[] { new AnalysisChartSeries("m1", "Haus", "kWh", [Available(1), Partial(2)]) },
            [nameof(AnalysisChart.Title)] = "Consumption of Haus",
        });
        Assert.Contains("aria-label=\"Chart: Consumption of Haus. The table lists the same values.\"", some, StringComparison.Ordinal);
        Assert.Contains("* Partial, estimated or not fully priced", some, StringComparison.Ordinal);
    }

    /// <summary>Renders a component and returns its HTML with entities decoded (the renderer encodes every non-ASCII letter).</summary>
    private static async Task<string> RenderAsync<TComponent>(string culture, Dictionary<string, object?> parameters)
        where TComponent : IComponent => WebUtility.HtmlDecode(await RenderRawAsync<TComponent>(culture, parameters));

    private static async Task<string> RenderRawAsync<TComponent>(string culture, Dictionary<string, object?> parameters)
        where TComponent : IComponent
    {
        await using var services = Services();
        using var loggers = new NullLoggerFactory();
        await using var renderer = new HtmlRenderer(services, loggers);

        var previous = (System.Globalization.CultureInfo.CurrentCulture, System.Globalization.CultureInfo.CurrentUICulture);
        try
        {
            System.Globalization.CultureInfo.CurrentCulture = System.Globalization.CultureInfo.GetCultureInfo(culture);
            System.Globalization.CultureInfo.CurrentUICulture = System.Globalization.CultureInfo.GetCultureInfo(culture);
            return await renderer.Dispatcher.InvokeAsync(async () =>
            {
                var output = await renderer.RenderComponentAsync<TComponent>(ParameterView.FromDictionary(parameters));
                return output.ToHtmlString();
            });
        }
        finally
        {
            System.Globalization.CultureInfo.CurrentCulture = previous.Item1;
            System.Globalization.CultureInfo.CurrentUICulture = previous.Item2;
        }
    }

    private static ServiceProvider Services()
    {
        var services = new ServiceCollection();
        services.AddLogging();
        services.AddMudServices();
        services.AddSingleton<IJSRuntime, NoJs>();
        services.AddSingleton<NavigationManager, TestNavigation>();
        services.AddScoped<ThemeState>();
        services.AddSingleton(Options.Create(new MeterVaultOptions()));
        services.AddSingleton<InstanceCurrency>();
        return services.BuildServiceProvider();
    }

    /// <summary>Static rendering runs no script; anything that asks gets nothing back.</summary>
    private sealed class NoJs : IJSRuntime
    {
        public ValueTask<TValue> InvokeAsync<TValue>(string identifier, object?[]? args) => ValueTask.FromResult(default(TValue)!);

        public ValueTask<TValue> InvokeAsync<TValue>(string identifier, CancellationToken cancellationToken, object?[]? args) =>
            ValueTask.FromResult(default(TValue)!);
    }

    private sealed class TestNavigation : NavigationManager
    {
        public TestNavigation() => Initialize("http://localhost/", "http://localhost/meters/5?tab=analysis");

        protected override void NavigateToCore(string uri, NavigationOptions options)
        {
        }
    }
}