using Data.SeaHavenIndustries;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Implementation;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Implementation;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

public class DropdownOptionsServiceTests
{
    private static ApplicationDbContext NewContext()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
            .Options;
        return new ApplicationDbContext(options);
    }

    private static DropdownOptionsService NewService(ApplicationDbContext ctx) =>
        new(new DropdownOptionsDataService(ctx));

    private static DropdownOption Option(string category, string value, string? parent = null, int sort = 0, bool active = true) =>
        new() { Category = category, Value = value, ParentValue = parent, SortOrder = sort, IsActive = active };

    [Fact]
    public async Task GetAllAsync_FiltersActiveAndOrdersBySortThenValue()
    {
        using var ctx = NewContext();
        ctx.DropdownOptions.AddRange(
            Option("Color", "Red", sort: 2),
            Option("Color", "Blue", sort: 1),
            Option("Color", "Green", sort: 1, active: false),
            Option("Shape", "Circle")
        );
        ctx.SaveChanges();

        var result = (await NewService(ctx).GetAllAsync(null, CancellationToken.None)).ToList();

        result.Should().HaveCount(3);
        result.Select(d => d.Value).Should().ContainInOrder("Blue", "Red", "Circle");
    }

    [Fact]
    public async Task GetByCategoryAsync_FiltersByCategoryAndParent()
    {
        using var ctx = NewContext();
        ctx.DropdownOptions.AddRange(
            Option("State", "TX", parent: "US"),
            Option("State", "CA", parent: "US"),
            Option("State", "ON", parent: "CA")
        );
        ctx.SaveChanges();

        var result = (await NewService(ctx).GetByCategoryAsync("State", "US", CancellationToken.None)).ToList();

        result.Select(d => d.Value).Should().BeEquivalentTo(new[] { "TX", "CA" });
    }

    [Fact]
    public async Task CreateAsync_WhenCategoryOrValueMissing_Throws()
    {
        using var ctx = NewContext();
        var act = () => NewService(ctx).CreateAsync(new DropdownOptionDTO { Category = "", Value = "X" }, CancellationToken.None);
        await act.Should().ThrowAsync<InvalidOperationException>();
    }

    [Fact]
    public async Task CreateAsync_WhenDuplicate_Throws()
    {
        using var ctx = NewContext();
        ctx.DropdownOptions.Add(Option("Color", "Red", parent: "Primary"));
        ctx.SaveChanges();

        var act = () => NewService(ctx).CreateAsync(new DropdownOptionDTO { Category = "Color", Value = "Red", ParentValue = "Primary" }, CancellationToken.None);

        await act.Should().ThrowAsync<InvalidOperationException>();
    }

    [Fact]
    public async Task CreateAsync_ForcesActiveTrueAndReturnsDtoWithId()
    {
        using var ctx = NewContext();
        var dto = await NewService(ctx).CreateAsync(
            new DropdownOptionDTO { Category = "Color", Value = "Red", IsActive = false }, CancellationToken.None);

        dto.Id.Should().BeGreaterThan(0);
        dto.IsActive.Should().BeTrue();
        ctx.DropdownOptions.Single().IsActive.Should().BeTrue();
    }

    [Fact]
    public async Task UpdateAsync_WhenNotFound_ThrowsKeyNotFound()
    {
        using var ctx = NewContext();
        var act = () => NewService(ctx).UpdateAsync(404, new DropdownOptionDTO { Category = "Color", Value = "Red" }, CancellationToken.None);
        await act.Should().ThrowAsync<KeyNotFoundException>();
    }

    [Fact]
    public async Task UpdateAsync_UpdatesValueParentSortActiveButNotCategory()
    {
        using var ctx = NewContext();
        var existing = Option("Color", "Red");
        ctx.DropdownOptions.Add(existing);
        ctx.SaveChanges();

        await NewService(ctx).UpdateAsync(existing.Id, new DropdownOptionDTO
        {
            Category = "Ignored",
            Value = "Crimson",
            ParentValue = "Warm",
            SortOrder = 5,
            IsActive = false
        }, CancellationToken.None);

        var row = ctx.DropdownOptions.Single();
        row.Category.Should().Be("Color");
        row.Value.Should().Be("Crimson");
        row.ParentValue.Should().Be("Warm");
        row.SortOrder.Should().Be(5);
        row.IsActive.Should().BeFalse();
    }

    [Fact]
    public async Task DeleteAsync_WhenNotFound_ThrowsKeyNotFound()
    {
        using var ctx = NewContext();
        var act = () => NewService(ctx).DeleteAsync(404, CancellationToken.None);
        await act.Should().ThrowAsync<KeyNotFoundException>();
    }

    [Fact]
    public async Task DeleteAsync_RemovesOption()
    {
        using var ctx = NewContext();
        var existing = Option("Color", "Red");
        ctx.DropdownOptions.Add(existing);
        ctx.SaveChanges();

        await NewService(ctx).DeleteAsync(existing.Id, CancellationToken.None);

        ctx.DropdownOptions.Should().BeEmpty();
    }
}