using MeterVault.Infrastructure.Costing;
using MeterVault.Infrastructure.Dashboard;
using MeterVault.Infrastructure.Import;
using MeterVault.Infrastructure.Persistence;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;

namespace MeterVault.Integration.Tests;

/// <summary>
/// End-to-end M5 check: load the reference dataset, then confirm the dashboard and admin pages
/// render (server prerender) without error and show real data. Cleans up the shared container.
/// </summary>
[Collection("Timescale")]
public sealed class DashboardRenderTests(TimescaleFixture fx)
{
    [Fact]
    public async Task Pages_render_with_reference_data()
    {
        using var factory = new MeterVaultAppFactory(fx.ConnectionString);

        using (var scope = factory.Services.CreateScope())
        {
            var importer = scope.ServiceProvider.GetRequiredService<ReferenceDataImporter>();
            await importer.LoadAsync(Path.Combine(AppContext.BaseDirectory, "fixtures"));
        }

        try
        {
            // The import created the reference meters and their normalized consumption.
            await using (var db = fx.CreateContext())
            {
                Assert.Contains(await db.Meters.Select(m => m.Name).ToListAsync(), n => n == "Zähler Haus");
                Assert.True(await db.Meters.CountAsync() >= 8);
                Assert.True(await db.Consumption.AnyAsync());

                // Regression (audit): Wasser is metered (water tariff), the Kosten Wasser column is
                // NOT imported, so the category is not double-counted — Dez 2022 = 14 m³ × 5 € = 70 €.
                var wasser = await db.CostCategories.FirstAsync(c => c.Name == "Wasser");
                var rollup = await new CostService(fx).GetCategoryCostsAsync(
                    wasser.Id,
                    new DateTimeOffset(2022, 12, 1, 0, 0, 0, TimeSpan.Zero),
                    new DateTimeOffset(2023, 1, 1, 0, 0, 0, TimeSpan.Zero));
                Assert.Equal(70d, rollup.Sum(r => r.Cost), 1);
            }

            // Panel read models compute real figures from the reference data (SDD §8.4–§8.6).
            int hausId;
            short electricityTypeId;
            using (var scope = factory.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                var wide = new DateOnly(1997, 1, 1);
                var toEnd = new DateOnly(2027, 1, 1);

                var solar = await services.GetRequiredService<SolarService>().GetSummaryAsync(wide, toEnd);
                Assert.True(solar.HasGeneration);
                Assert.True(solar.Generation > 0);
                // Haus (total_load) + Netz (grid_import) are role-tagged, so self-consumption/savings resolve.
                Assert.True(solar.HasLoadContext);
                Assert.NotNull(solar.SelfConsumption);
                Assert.NotNull(solar.Savings);

                var consumables = await services.GetRequiredService<ConsumableService>().GetConsumablesAsync(wide, toEnd);
                var oil = Assert.Single(consumables);
                Assert.True(oil.CurrentLevel is > 0);
                Assert.NotEmpty(oil.Deliveries);
                Assert.True(oil.ConsumptionInRange > 0);

                await using var db = fx.CreateContext();
                hausId = await db.Meters.Where(m => m.Name == "Zähler Haus").Select(m => m.Id).FirstAsync();
                var detail = await services.GetRequiredService<MeterDetailService>().GetAsync(hausId);
                Assert.NotNull(detail);
                Assert.True(detail!.ReadingCount > 0);
                Assert.True(detail.TotalConsumption > 0);

                // Flow graph: the demo Haus → Auto chain yields a link + an "Other (Haus)" remainder.
                electricityTypeId = await db.EnergyTypes.Where(t => t.Key == "electricity").Select(t => t.Id).FirstAsync();
                var flow = await services.GetRequiredService<FlowService>()
                    .GetFlowAsync(electricityTypeId, new DateOnly(1997, 1, 1), new DateOnly(2027, 1, 1));
                Assert.True(flow.HasChain);
                Assert.Contains(flow.Nodes, n => n.IsOther);
            }

            using var client = factory.CreateClient();

            var overview = await client.GetAsync(new Uri("/", UriKind.Relative));
            overview.EnsureSuccessStatusCode();
            var html = await overview.Content.ReadAsStringAsync();
            Assert.Contains("Overview", html, StringComparison.Ordinal);
            // These labels live only in the rendered-KPI-card branch, so their presence proves the
            // summary loaded and the cards rendered (non-ASCII like € is HTML-entity-encoded).
            Assert.Contains("This month", html, StringComparison.Ordinal);
            Assert.Contains("This year", html, StringComparison.Ordinal);
            Assert.Contains("Latest month with data", html, StringComparison.Ordinal);

            foreach (var path in new[]
            {
                "/meters", "/trends", "/solar", "/consumables", "/import",
                "/admin/tariffs", "/admin/energy-types", "/admin/categories",
                "/admin/connectors", "/admin/settings", $"/meters/{hausId}",
                $"/energy/{electricityTypeId}",
            })
            {
                var response = await client.GetAsync(new Uri(path, UriKind.Relative));
                response.EnsureSuccessStatusCode();
            }

            // Manual entry is reachable without an API key or a CSV: the Readings tab of a real
            // (non-virtual) meter offers it, prefilled with that meter's last register value.
            var meterPage = await (await client.GetAsync(new Uri($"/meters/{hausId}", UriKind.Relative)))
                .Content.ReadAsStringAsync();
            Assert.Contains("Add reading", meterPage, StringComparison.Ordinal);
        }
        finally
        {
            await using var db = fx.CreateContext();
            await ClearDataAsync(db);
        }
    }

    private static async Task ClearDataAsync(MeterVaultDbContext db)
    {
        await db.MeterLinks.ExecuteDeleteAsync();
        await db.Consumption.ExecuteDeleteAsync();
        await db.Readings.ExecuteDeleteAsync();
        await db.MeterEvents.ExecuteDeleteAsync();
        await db.ManualCosts.ExecuteDeleteAsync();
        await db.CostCategoryMembers.ExecuteDeleteAsync();
        await db.Tariffs.ExecuteDeleteAsync();
        await db.Tanks.ExecuteDeleteAsync();
        await db.MeterSources.ExecuteDeleteAsync();
        await db.Meters.ExecuteDeleteAsync();
        await db.ImportBatches.ExecuteDeleteAsync();
    }
}