using Api.SeaHavenIndustries.DTOs;
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 CalendarServiceTests
{
    private static ApplicationDbContext NewContext()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
            .Options;
        return new ApplicationDbContext(options);
    }

    private static CalendarService NewService(ApplicationDbContext ctx) =>
        new(new CalendarDataService(ctx));

    private static EditEventInput ValidInput(int? id = null, string title = "Standup") => new()
    {
        Id = id,
        Title = title,
        ReminderMinutes = 15,
        EventColor = "primary",
        StartDate = new DateTime(2026, 6, 1),
        StartTime = "08:00 AM",
        EndDate = new DateTime(2026, 6, 1),
        EndTime = "08:30 AM"
    };

    private static Events SeedEvent(ApplicationDbContext ctx, string title, DateTime startDate, bool? isDeleted = false)
    {
        var ev = new Events
        {
            Title = title,
            EventColor = "primary",
            ReminderMinutes = 15,
            StartDate = startDate,
            EndDate = startDate,
            IsDeleted = isDeleted,
            CreatedDate = DateTime.UtcNow
        };
        ctx.Events.Add(ev);
        ctx.SaveChanges();
        return ev;
    }

    private static object Prop(object source, string name) =>
        source.GetType().GetProperty(name)!.GetValue(source)!;

    [Fact]
    public async Task CreateEventAsync_PersistsEventWithMappedFieldsAndCreatedDate()
    {
        using var ctx = NewContext();
        await NewService(ctx).CreateEventAsync(ValidInput(), CancellationToken.None);

        var saved = ctx.Events.Single();
        saved.Title.Should().Be("Standup");
        saved.IsDeleted.Should().Be(false);
        saved.CreatedDate.Should().NotBeNull();
        saved.CreatedDate!.Value.Kind.Should().Be(DateTimeKind.Utc);
    }

    [Fact]
    public async Task UpdateEventAsync_WhenNotFound_ReturnsFalse()
    {
        using var ctx = NewContext();
        var result = await NewService(ctx).UpdateEventAsync(ValidInput(id: 999), CancellationToken.None);
        result.Should().BeFalse();
    }

    [Fact]
    public async Task UpdateEventAsync_WhenSoftDeleted_ReturnsFalse()
    {
        using var ctx = NewContext();
        var existing = SeedEvent(ctx, "Old", new DateTime(2026, 6, 1), isDeleted: true);

        var result = await NewService(ctx).UpdateEventAsync(ValidInput(id: existing.Id, title: "New"), CancellationToken.None);

        result.Should().BeFalse();
    }

    [Fact]
    public async Task UpdateEventAsync_WhenEventExists_UpdatesFieldsAndStampsModified()
    {
        using var ctx = NewContext();
        var existing = SeedEvent(ctx, "Old", new DateTime(2026, 6, 1));

        var result = await NewService(ctx).UpdateEventAsync(ValidInput(id: existing.Id, title: "New"), CancellationToken.None);

        result.Should().BeTrue();
        var updated = ctx.Events.Single();
        updated.Title.Should().Be("New");
        updated.LastModificationTime.Should().NotBeNull();
        updated.LastModificationTime!.Value.Kind.Should().Be(DateTimeKind.Utc);
    }

    [Fact]
    public async Task GetEventByIdAsync_WhenExists_ReturnsMappedDto()
    {
        using var ctx = NewContext();
        var existing = SeedEvent(ctx, "Review", new DateTime(2026, 6, 1));

        var dto = await NewService(ctx).GetEventByIdAsync(existing.Id, CancellationToken.None);

        dto.Should().NotBeNull();
        dto!.Title.Should().Be("Review");
    }

    [Fact]
    public async Task GetEventByIdAsync_WhenSoftDeleted_ReturnsNull()
    {
        using var ctx = NewContext();
        var deleted = SeedEvent(ctx, "Gone", new DateTime(2026, 6, 1), isDeleted: true);

        var dto = await NewService(ctx).GetEventByIdAsync(deleted.Id, CancellationToken.None);

        dto.Should().BeNull();
    }

    [Fact]
    public async Task DeleteEventAsync_WhenExists_SoftDeletesAndKeepsRow()
    {
        using var ctx = NewContext();
        var existing = SeedEvent(ctx, "Cancel", new DateTime(2026, 6, 1));

        var result = await NewService(ctx).DeleteEventAsync(existing.Id, CancellationToken.None);

        result.Should().BeTrue();
        var row = ctx.Events.Single();
        row.IsDeleted.Should().Be(true);
        row.DeletionTime.Should().NotBeNull();
        row.DeletionTime!.Value.Kind.Should().Be(DateTimeKind.Utc);
    }

    [Fact]
    public async Task DeleteEventAsync_WhenNotFound_ReturnsFalse()
    {
        using var ctx = NewContext();
        var result = await NewService(ctx).DeleteEventAsync(12345, CancellationToken.None);
        result.Should().BeFalse();
    }

    [Fact]
    public async Task GetEventListAsync_ExcludesDeletedAndCountsAfterFilter()
    {
        using var ctx = NewContext();
        SeedEvent(ctx, "Alpha meeting", new DateTime(2026, 6, 1));
        SeedEvent(ctx, "Beta meeting", new DateTime(2026, 6, 2));
        SeedEvent(ctx, "Alpha review", new DateTime(2026, 6, 3));
        SeedEvent(ctx, "Alpha archived", new DateTime(2026, 6, 4), isDeleted: true);

        var result = await NewService(ctx).GetEventListAsync("alpha", 1, 10, CancellationToken.None);

        result.TotalCount.Should().Be(2);
        result.Rows.Should().HaveCount(2);
    }

    [Fact]
    public async Task GetEventListAsync_OrdersByStartDateDescending()
    {
        using var ctx = NewContext();
        SeedEvent(ctx, "Earliest", new DateTime(2026, 6, 1));
        SeedEvent(ctx, "Latest", new DateTime(2026, 6, 10));
        SeedEvent(ctx, "Middle", new DateTime(2026, 6, 5));

        var result = await NewService(ctx).GetEventListAsync(null, 1, 10, CancellationToken.None);

        result.Rows.Select(r => r.Title).Should().ContainInOrder("Latest", "Middle", "Earliest");
    }

    [Fact]
    public async Task GetEventsForCalendarAsync_ReturnsOnlyEventsOverlappingRange()
    {
        using var ctx = NewContext();
        SeedEvent(ctx, "InRange", new DateTime(2026, 6, 15));
        SeedEvent(ctx, "BeforeRange", new DateTime(2026, 5, 1));
        SeedEvent(ctx, "AfterRange", new DateTime(2026, 7, 1));

        var events = await NewService(ctx).GetEventsForCalendarAsync(
            new DateTime(2026, 6, 1), new DateTime(2026, 6, 30), CancellationToken.None);

        events.Select(e => e.Title).Should().BeEquivalentTo(new[] { "InRange" });
    }
}