using System.Collections;
using Api.SeaHavenIndustries.Controllers;
using Api.SeaHavenIndustries.DTOs;
using Data.SeaHavenIndustries;
using FluentAssertions;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Moq;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

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

    private static UserManager<ApplicationUser> MockUserManager()
    {
        var store = new Mock<IUserStore<ApplicationUser>>();
        return new Mock<UserManager<ApplicationUser>>(
            store.Object, null!, null!, null!, null!, null!, null!, null!, null!).Object;
    }

    private static CalendarController NewController(ApplicationDbContext ctx) =>
        new(MockUserManager(), ctx);

    private static EditEvent_DTO ValidDto(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.Now
        };
        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 AddEvent_WhenValid_PersistsEventAndReturnsOk()
    {
        using var ctx = NewContext();
        var result = await NewController(ctx).AddEvent(ValidDto());

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        ok.Value.Should().BeOfType<DataResponse>().Which.Status.Should().Be("200");

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

    [Fact]
    public async Task EditEvent_WhenIdMissing_ReturnsBadRequest()
    {
        using var ctx = NewContext();
        var result = await NewController(ctx).EditEvent(ValidDto(id: null));

        result.Should().BeOfType<BadRequestObjectResult>();
    }

    [Fact]
    public async Task EditEvent_WhenEventNotFound_ReturnsNotFound()
    {
        using var ctx = NewContext();
        var result = await NewController(ctx).EditEvent(ValidDto(id: 999));

        result.Should().BeOfType<NotFoundObjectResult>();
    }

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

        var result = await NewController(ctx).EditEvent(ValidDto(id: existing.Id, title: "New"));

        result.Should().BeOfType<OkObjectResult>();
        var updated = ctx.Events.Single();
        updated.Title.Should().Be("New");
        updated.LastModificationTime.Should().NotBeNull();
    }

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

        var result = await NewController(ctx).GetEventById(existing.Id);

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var dto = ok.Value.Should().BeOfType<DataResponse>().Subject.Data as Event_DTO;
        dto!.Title.Should().Be("Review");
    }

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

        var result = await NewController(ctx).GetEventById(deleted.Id);

        result.Should().BeOfType<NotFoundObjectResult>();
    }

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

        var result = await NewController(ctx).DeleteEvent(existing.Id);

        result.Should().BeOfType<OkObjectResult>();
        var row = ctx.Events.Single();
        row.IsDeleted.Should().Be(true);
        row.DeletionTime.Should().NotBeNull();
    }

    [Fact]
    public async Task DeleteEvent_WhenNotFound_ReturnsNotFound()
    {
        using var ctx = NewContext();
        var result = await NewController(ctx).DeleteEvent(12345);

        result.Should().BeOfType<NotFoundObjectResult>();
    }

    [Fact]
    public void GetEventList_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 = NewController(ctx).GetEventList(search: "alpha", page: 1, pageSize: 10);

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var data = ok.Value.Should().BeOfType<DataResponse>().Subject.Data!;
        ((int)Prop(data, "totalCount")).Should().Be(2);
    }

    [Fact]
    public void GetEventList_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 = NewController(ctx).GetEventList(page: 1, pageSize: 10);

        var data = (result as OkObjectResult)!.Value.As<DataResponse>().Data!;
        var rows = ((IEnumerable)Prop(data, "rows")).Cast<Event_DTO>().ToList();
        rows.Select(r => r.Title).Should().ContainInOrder("Latest", "Middle", "Earliest");
    }

    [Fact]
    public void GetEventsForCalendar_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 result = NewController(ctx).GetEventsForCalendar(
            start: new DateTime(2026, 6, 1), end: new DateTime(2026, 6, 30));

        var ok = result.Should().BeOfType<OkObjectResult>().Subject;
        var events = ok.Value.As<DataResponse>().Data as IEnumerable<Event_DTO>;
        events!.Select(e => e.Title).Should().BeEquivalentTo(new[] { "InRange" });
    }
}