using System.Security.Claims;
using Api.SeaHavenIndustries.Controllers;
using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using FluentAssertions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Implementation;
using SeaHaven.DataServices.Models;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Exceptions;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

/// <summary>
/// SEV response-window alerts in the Notification Center: at risk from 50% of the window (banner set and a
/// dismissable row), breached from 100% (an acknowledge row that only acknowledging removes).
/// </summary>
public class NotificationSlaTests
{
    private static readonly DateTime Now = new(2026, 9, 18, 16, 0, 0, DateTimeKind.Utc);

    private sealed class FixedTimeProvider : TimeProvider
    {
        public override DateTimeOffset GetUtcNow() => new(Now);
    }

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

    private static WorkOrderAccountResolver Resolver(ApplicationDbContext context)
        => new(new AccountDataService(context), new LocationDataService(context));

    private static NotificationFeedService NewFeed(ApplicationDbContext context)
        => new(
            new NotificationFeedDataService(context),
            new VendorOperationsDataService(context, new DispatchDataService(context)),
            Resolver(context),
            new FixedTimeProvider());

    private static SlaBreachAcknowledgementService NewAcknowledgement(ApplicationDbContext context)
        => new(
            new NotificationFeedDataService(context),
            new WorkOrderAuditDataService(context),
            new UserDataService(context),
            Resolver(context),
            new FixedTimeProvider());

    private static ClaimsPrincipal User(int accountId, string role, string userId = "disp-1")
        => new(new ClaimsIdentity(new[]
        {
            new Claim(SeaHavenClaimTypes.AccountId, accountId.ToString()),
            new Claim(ClaimTypes.NameIdentifier, userId),
            new Claim(ClaimTypes.Role, role)
        }, "test"));

    private static WorkOrder Sla(
        int id,
        TimeSpan age,
        string? severity = "1",
        WorkOrderType? type = WorkOrderType.Reactive,
        int accountId = 1,
        string? assignTo = "disp-1",
        DateTime? scheduled = null,
        LifecycleStatus status = LifecycleStatus.Scheduled)
        => new()
        {
            Id = id,
            AccountId = accountId,
            AssignTo = assignTo,
            InternalWONumber = $"{1000 + id}",
            WorkOrderType = type,
            Severity = severity,
            CreatedDate = Now - age,
            ScheduledDate = scheduled,
            LifecycleStatus = status
        };

    private static TimeSpan Window(int severity) => SlaResponseWindows.Respond[severity];

    private static NotificationSectionDto? SlaSection(NotificationFeedDto feed)
        => feed.Sections.SingleOrDefault(section => section.Reason == NotificationReasons.Sla);

    private static IEnumerable<string> ItemIds(NotificationFeedDto feed)
        => SlaSection(feed)?.Items.Select(item => item.Id) ?? Enumerable.Empty<string>();

    [Fact]
    public void ResponseWindows_AreTheRespondDeadlinesOnTheSeverityBadge()
    {
        SlaResponseWindows.Respond.ToDictionary(pair => pair.Key, pair => pair.Value.TotalMinutes)
            .Should().Equal(new Dictionary<int, double>
            {
                [1] = 120,
                [2] = 240,
                [3] = 480,
                [4] = 1440,
                [5] = 4320
            });
    }

    [Theory]
    [InlineData(1)]
    [InlineData(2)]
    [InlineData(3)]
    [InlineData(4)]
    [InlineData(5)]
    public async Task Thresholds_AtRiskFromHalfTheWindow_BreachedFromTheWholeWindow(int severity)
    {
        using var context = NewContext();
        var second = TimeSpan.FromSeconds(1);
        var window = Window(severity);
        var level = severity.ToString();
        context.workOrders.AddRange(
            Sla(1, window / 2 - second, level),
            Sla(2, window / 2, level),
            Sla(3, window / 2 + second, level),
            Sla(4, window - second, level),
            Sla(5, window, level),
            Sla(6, window + second, level));
        await context.SaveChangesAsync();

        var feed = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher"), CancellationToken.None);

        feed.SlaAtRisk.Select(workOrder => workOrder.Id).Should().BeEquivalentTo(new[] { 2, 3, 4 });
        ItemIds(feed).Should().BeEquivalentTo(
            "sla-at-risk-2", "sla-at-risk-3", "sla-at-risk-4", "sla-breach-5", "sla-breach-6");

        var section = SlaSection(feed)!;
        section.Label.Should().Be("SLA at Risk");
        section.Count.Should().Be(5);
        section.Severity.Should().Be(NotificationSeverities.Critical);
        section.Items.Where(item => item.Id.StartsWith("sla-breach-")).Should().OnlyContain(item =>
            item.RowType == NotificationRowTypes.Acknowledge
            && item.Severity == NotificationSeverities.Critical
            && item.Title.EndsWith("missed its response deadline"));
        section.Items.Where(item => item.Id.StartsWith("sla-at-risk-")).Should().OnlyContain(item =>
            item.RowType == NotificationRowTypes.Dismissable
            && item.Severity == NotificationSeverities.High
            && item.Title.EndsWith("is at risk of missing its response deadline"));
    }

    [Fact]
    public async Task AtRisk_CarriesTheServerComputedClock()
    {
        using var context = NewContext();
        context.workOrders.Add(Sla(7, TimeSpan.FromMinutes(90), "1"));
        await context.SaveChangesAsync();

        var feed = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher"), CancellationToken.None);

        var atRisk = feed.SlaAtRisk.Should().ContainSingle().Subject;
        atRisk.Number.Should().Be("1007");
        atRisk.Severity.Should().Be(1);
        atRisk.StartedAt.Should().Be(Now.AddMinutes(-90));
        atRisk.DeadlineAt.Should().Be(Now.AddMinutes(30));
        atRisk.DeadlineAt.Kind.Should().Be(DateTimeKind.Utc);
        atRisk.PercentElapsed.Should().Be(75);
        SlaSection(feed)!.Items.Single().Title.Should().Be("WO #1007 is at risk of missing its response deadline");
    }

    [Fact]
    public async Task OnlyOpenReactiveOrEmergencyWorkOrdersWithASeverityLevelAreTracked()
    {
        using var context = NewContext();
        var late = Window(1) * 2;
        context.workOrders.AddRange(
            Sla(1, late, "1", WorkOrderType.Reactive),
            Sla(2, late, "2", WorkOrderType.Emergency),
            Sla(3, late, "1", WorkOrderType.PM),
            Sla(4, late, "1", WorkOrderType.Inspection),
            Sla(5, late, "1", type: null),
            Sla(6, late, severity: null),
            Sla(7, late, severity: "9"),
            Sla(8, late, "1", status: LifecycleStatus.Completed),
            Sla(9, late, "1", status: LifecycleStatus.Canceled));
        await context.SaveChangesAsync();

        var feed = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher"), CancellationToken.None);

        ItemIds(feed).Should().BeEquivalentTo("sla-breach-1", "sla-breach-2");
    }

    [Fact]
    public async Task TheClockStartsAtCreation_WhateverTheScheduledDate()
    {
        using var context = NewContext();
        context.workOrders.AddRange(
            Sla(1, Window(3) + TimeSpan.FromMinutes(1), "3", scheduled: null),
            // Scheduled next week, but logged three days ago: the deadline is long gone.
            Sla(2, TimeSpan.FromDays(3), "4", scheduled: Now.AddDays(7)),
            // Scheduled days ago, but logged ten minutes ago: nothing is due yet.
            Sla(3, TimeSpan.FromMinutes(10), "4", scheduled: Now.AddDays(-5)));
        await context.SaveChangesAsync();

        var feed = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher"), CancellationToken.None);

        ItemIds(feed).Should().BeEquivalentTo("sla-breach-1", "sla-breach-2");
        feed.SlaAtRisk.Should().BeEmpty();
    }

    [Fact]
    public async Task Dispatcher_OnlySeesTheirOwnWorkOrders_AndTheAccountStaysTheBoundary()
    {
        using var context = NewContext();
        var atRisk = Window(2) * 3 / 4;
        context.workOrders.AddRange(
            Sla(1, atRisk, "2", assignTo: "disp-1"),
            Sla(2, atRisk, "2", assignTo: "disp-2"),
            Sla(3, atRisk, "2", assignTo: null),
            Sla(4, atRisk, "2", assignTo: "disp-1", accountId: 2));
        await context.SaveChangesAsync();

        var dispatcher = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher", "disp-1"), CancellationToken.None);
        var admin = await NewFeed(context).GetFeedAsync(User(1, "Admin", "admin-1"), CancellationToken.None);
        var otherAccount = await NewFeed(context).GetFeedAsync(User(2, "Admin", "admin-2"), CancellationToken.None);

        dispatcher.SlaAtRisk.Select(workOrder => workOrder.Id).Should().Equal(1);
        ItemIds(dispatcher).Should().Equal("sla-at-risk-1");
        admin.SlaAtRisk.Select(workOrder => workOrder.Id).Should().BeEquivalentTo(new[] { 1, 2, 3 });
        otherAccount.SlaAtRisk.Select(workOrder => workOrder.Id).Should().Equal(4);
    }

    [Fact]
    public async Task Breaches_AreCappedSeparately_SoAtRiskRowsAlwaysShow()
    {
        using var context = NewContext();
        for (var id = 1; id <= NotificationFeedService.SectionItemLimit + 10; id++)
            context.workOrders.Add(Sla(id, Window(1) + TimeSpan.FromMinutes(id), "1"));
        context.workOrders.Add(Sla(500, Window(5) * 3 / 4, "5"));
        await context.SaveChangesAsync();

        var feed = await NewFeed(context).GetFeedAsync(User(1, "Dispatcher"), CancellationToken.None);

        var section = SlaSection(feed)!;
        section.Count.Should().Be(NotificationFeedService.SectionItemLimit + 11);
        section.Items.Count(item => item.RowType == NotificationRowTypes.Acknowledge)
            .Should().Be(NotificationFeedService.SectionItemLimit);
        section.Items.Should().Contain(item => item.Id == "sla-at-risk-500");
        // The newest breaches are kept.
        section.Items.Should().Contain(item => item.Id == "sla-breach-1");
        section.Items.Should().NotContain(item => item.Id == $"sla-breach-{NotificationFeedService.SectionItemLimit + 10}");
    }

    [Fact]
    public async Task Acknowledge_RecordsWhoAndWhenInTheAuditHistory_AndRemovesTheRow()
    {
        using var context = NewContext();
        context.Users.Add(new ApplicationUser { Id = "disp-1", UserName = "jane", FirstName = "Jane", LastName = "Doe" });
        context.workOrders.AddRange(
            Sla(1, Window(1) + TimeSpan.FromMinutes(5), "1"),
            Sla(2, Window(1) + TimeSpan.FromMinutes(9), "1"));
        await context.SaveChangesAsync();
        var user = User(1, "Dispatcher", "disp-1");

        var outcome = await NewAcknowledgement(context).AcknowledgeAsync(user, 1, CancellationToken.None);

        outcome.Should().Be(SlaBreachAcknowledgementOutcome.Acknowledged);
        var audit = await context.WorkOrderAuditLogs.SingleAsync();
        audit.WorkOrderId.Should().Be(1);
        audit.UserId.Should().Be("disp-1");
        audit.CreatedAt.Should().Be(Now);
        audit.Action.Should().Be("SLA breach acknowledged by Jane Doe");
        audit.FieldName.Should().Be(SlaBreachAcknowledgementAudit.FieldName);
        audit.NewValue.Should().Be("1");
        audit.EventType.Should().Be("system");

        var feed = await NewFeed(context).GetFeedAsync(user, CancellationToken.None);
        ItemIds(feed).Should().Equal("sla-breach-2");
        SlaSection(feed)!.Count.Should().Be(1);

        var again = await NewAcknowledgement(context).AcknowledgeAsync(user, 1, CancellationToken.None);
        again.Should().Be(SlaBreachAcknowledgementOutcome.AlreadyAcknowledged);
        (await context.WorkOrderAuditLogs.CountAsync()).Should().Be(1);
    }

    [Fact]
    public async Task Acknowledgement_CoversOnlyTheSeverityThatWasBreached()
    {
        using var context = NewContext();
        var workOrder = Sla(1, TimeSpan.FromHours(30), "2");
        context.workOrders.Add(workOrder);
        await context.SaveChangesAsync();
        var user = User(1, "Dispatcher", "disp-1");
        await NewAcknowledgement(context).AcknowledgeAsync(user, 1, CancellationToken.None);

        workOrder.Severity = "4";
        await context.SaveChangesAsync();
        var feed = await NewFeed(context).GetFeedAsync(user, CancellationToken.None);

        ItemIds(feed).Should().Equal("sla-breach-1");
    }

    [Fact]
    public async Task Acknowledge_IsRefusedOutsideTheCallersFeed()
    {
        using var context = NewContext();
        var late = Window(1) * 2;
        context.workOrders.AddRange(
            Sla(1, late, "1", accountId: 2, assignTo: "disp-1"),
            Sla(2, late, "1", assignTo: "disp-2"),
            Sla(3, late, "1", status: LifecycleStatus.Completed),
            Sla(4, late, "1", WorkOrderType.PM));
        await context.SaveChangesAsync();
        var service = NewAcknowledgement(context);
        var dispatcher = User(1, "Dispatcher", "disp-1");

        (await service.AcknowledgeAsync(dispatcher, 1, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.NotFound);
        (await service.AcknowledgeAsync(User(1, "Admin", "admin-1"), 1, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.NotFound);
        (await service.AcknowledgeAsync(dispatcher, 2, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.NotFound);
        (await service.AcknowledgeAsync(dispatcher, 3, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.NotFound);
        (await service.AcknowledgeAsync(dispatcher, 4, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.NotFound);
        (await context.WorkOrderAuditLogs.CountAsync()).Should().Be(0);

        var otherAccountAdmin = User(2, "Admin", "admin-2");
        (await service.AcknowledgeAsync(otherAccountAdmin, 1, CancellationToken.None))
            .Should().Be(SlaBreachAcknowledgementOutcome.Acknowledged);
    }

    [Fact]
    public async Task Acknowledge_BeforeTheDeadlineIsRefused()
    {
        using var context = NewContext();
        context.workOrders.Add(Sla(1, Window(1) * 3 / 4, "1"));
        await context.SaveChangesAsync();

        var outcome = await NewAcknowledgement(context)
            .AcknowledgeAsync(User(1, "Dispatcher", "disp-1"), 1, CancellationToken.None);

        outcome.Should().Be(SlaBreachAcknowledgementOutcome.NotBreached);
        (await context.WorkOrderAuditLogs.CountAsync()).Should().Be(0);
    }

    [Fact]
    public async Task Acknowledge_WithoutANotificationRole_FailsClosed()
    {
        using var context = NewContext();
        context.workOrders.Add(Sla(1, Window(1) * 2, "1"));
        await context.SaveChangesAsync();

        var act = () => NewAcknowledgement(context).AcknowledgeAsync(User(1, "Vendor"), 1, CancellationToken.None);

        (await act.Should().ThrowAsync<WorkOrderBoardValidationException>()).Which.Code.Should().Be("Forbidden");
    }

    [Theory]
    [InlineData(1, "Dispatcher", 1, StatusCodes.Status204NoContent)]
    [InlineData(2, "Admin", 1, StatusCodes.Status404NotFound)]
    [InlineData(1, "Dispatcher", 2, StatusCodes.Status409Conflict)]
    [InlineData(1, "Vendor", 1, StatusCodes.Status403Forbidden)]
    public async Task Controller_MapsAcknowledgeOutcomes(int accountId, string role, int workOrderId, int expectedStatus)
    {
        using var context = NewContext();
        context.workOrders.AddRange(
            Sla(1, Window(1) * 2, "1"),
            Sla(2, Window(1) * 3 / 4, "1"));
        await context.SaveChangesAsync();
        var controller = new NotificationsController(NewFeed(context), NewAcknowledgement(context))
        {
            ControllerContext = new ControllerContext
            {
                HttpContext = new DefaultHttpContext { User = User(accountId, role, "disp-1") }
            }
        };

        var result = await controller.AcknowledgeSlaBreach(workOrderId, CancellationToken.None);

        result.Should().BeAssignableTo<IStatusCodeActionResult>()
            .Which.StatusCode.Should().Be(expectedStatus);
    }

    [Fact]
    public async Task Acknowledge_ForwardsCancellation()
    {
        using var context = NewContext();
        context.workOrders.Add(Sla(1, Window(1) * 2, "1"));
        await context.SaveChangesAsync();
        using var cancellation = new CancellationTokenSource();
        cancellation.Cancel();

        var act = () => NewAcknowledgement(context)
            .AcknowledgeAsync(User(1, "Dispatcher", "disp-1"), 1, cancellation.Token);

        await act.Should().ThrowAsync<OperationCanceledException>();
        (await context.WorkOrderAuditLogs.CountAsync()).Should().Be(0);
    }
}