using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using Tau.Acuvim.Portal.Configuration;
using Tau.Acuvim.Portal.Data;
using Tau.Acuvim.Portal.DTOs;
using Tau.Acuvim.Portal.Services;

namespace Tau.Acuvim.Portal.Tests;

// Proves the "pre-brand at spin-up" flow end-to-end at the C# level:
//   docker-compose WhiteLabel__* env var → IOptions<WhiteLabelOptions>
//     → BrandingService.SeedAsync → WhiteLabelSettings row on first read.
//
// The Docker passthrough that bridges env-var → container is pure YAML and
// covered by the integration spin-up; this test pins the C# half so we'd
// catch a regression in BrandingService that broke the contract (e.g. someone
// changing SeedAsync to use a constructor literal instead of IOptions).
public class BrandingSeedFromOptionsTests
{
    private static AppDbContext NewDb() =>
        new(new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase("brand-" + Guid.NewGuid())
            .Options);

    private static BrandingService NewService(AppDbContext db, WhiteLabelOptions opts) =>
        new(db, Options.Create(opts));

    private static WhiteLabelOptions AcmeBrand() => new()
    {
        ApplicationName = "Acme Power Monitoring",
        LogoUrl = "https://cdn.acme.example/logo.png",
        PrimaryColor = "#0c4a6e",
        SecondaryColor = "#0e7490",
        AccentColor = "#06b6d4",
        FooterText = "© Acme Corp",
    };

    [Fact]
    public async Task FirstGet_SeedsRowFromOptions()
    {
        using var db = NewDb();
        var svc = NewService(db, AcmeBrand());

        var result = await svc.GetAsync();

        Assert.Equal("Acme Power Monitoring", result.ApplicationName);
        Assert.Equal("https://cdn.acme.example/logo.png", result.LogoUrl);
        Assert.Equal("#0c4a6e", result.PrimaryColor);
        Assert.Equal("#0e7490", result.SecondaryColor);
        Assert.Equal("#06b6d4", result.AccentColor);
        Assert.Equal("© Acme Corp", result.FooterText);
    }

    [Fact]
    public async Task SecondGet_DoesNotReseed_EvenIfOptionsChange()
    {
        using var db = NewDb();
        var first = NewService(db, AcmeBrand());
        await first.GetAsync();

        // Operator "changes the template defaults" — but the row already exists
        // in the DB, so the UI-authoritative value must win on subsequent gets.
        // This is the contract that makes Settings → Branding actually durable.
        var changedDefaults = new WhiteLabelOptions
        {
            ApplicationName = "Different Defaults",
            PrimaryColor = "#ff0000",
            SecondaryColor = "#00ff00",
            AccentColor = "#0000ff",
            FooterText = "different",
        };
        var second = NewService(db, changedDefaults);

        var result = await second.GetAsync();

        Assert.Equal("Acme Power Monitoring", result.ApplicationName);
        Assert.Equal("#0c4a6e", result.PrimaryColor);
    }

    [Fact]
    public async Task EnsureSeededAsync_WritesRowImmediately_NoGetNeeded()
    {
        using var db = NewDb();
        var svc = NewService(db, AcmeBrand());

        await svc.EnsureSeededAsync();

        var row = await db.WhiteLabelSettings.AsNoTracking().SingleAsync();
        Assert.Equal("Acme Power Monitoring", row.ApplicationName);
        Assert.Equal("#06b6d4", row.AccentColor);
    }

    [Fact]
    public async Task EnsureSeededAsync_IsIdempotent()
    {
        using var db = NewDb();
        var svc = NewService(db, AcmeBrand());

        await svc.EnsureSeededAsync();
        await svc.EnsureSeededAsync();
        await svc.EnsureSeededAsync();

        var rowCount = await db.WhiteLabelSettings.CountAsync();
        Assert.Equal(1, rowCount);
    }

    [Fact]
    public async Task UpdateAsync_BlankFields_FallBackToOptionsDefaults()
    {
        using var db = NewDb();
        var svc = NewService(db, AcmeBrand());
        await svc.GetAsync(); // seed

        // Operator clears the application name in the UI — service should
        // fall back to the IOptions default rather than persist empty string.
        var updated = await svc.UpdateAsync(new UpdateBrandingRequest(
            ApplicationName: "",
            PrimaryColor: "#abc123",
            SecondaryColor: "",
            AccentColor: "",
            FooterText: "kept",
            LogoUrl: null));

        Assert.Equal("Acme Power Monitoring", updated.ApplicationName);
        Assert.Equal("#abc123", updated.PrimaryColor);
        Assert.Equal("#0e7490", updated.SecondaryColor);
        Assert.Equal("#06b6d4", updated.AccentColor);
        Assert.Equal("kept", updated.FooterText);
    }
}