using System.Security.Claims;
using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Implementation;
using SeaHaven.DataServices.Models;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Implementation;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

/// <summary>
/// Items addressed to the signed-in user: new assignments (SH-288), comments (SH-289),
/// mentions, and decisions on their uplift requests (SH-215).
/// </summary>
public class NotificationActivityFeedTests
{
    private static readonly DateTime Now = new(2026, 9, 18, 16, 0, 0, DateTimeKind.Utc);
    private const string Me = "dispatcher-me";
    private const string Other = "dispatcher-other";
    private const string Admin = "admin-1";

    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;
        var context = new ApplicationDbContext(options);
        context.Users.AddRange(
            new ApplicationUser { Id = Me, FirstName = "Maya", LastName = "Reed" },
            new ApplicationUser { Id = Other, FirstName = "Omar", LastName = "Diaz" },
            new ApplicationUser { Id = Admin, FirstName = "Ada", LastName = "Stone" });
        context.SaveChanges();
        return context;
    }

    private static NotificationFeedService NewService(ApplicationDbContext context)
        => new(
            new NotificationFeedDataService(context),
            new VendorOperationsDataService(context, new DispatchDataService(context)),
            new WorkOrderAccountResolver(new AccountDataService(context), new LocationDataService(context)),
            new FixedTimeProvider());

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

    private static ClaimsPrincipal Dispatcher(int accountId = 1, string userId = Me) => User(accountId, "Dispatcher", userId);

    private static WorkOrder AddWorkOrder(ApplicationDbContext context, int accountId, string? assignTo, string number,
        LifecycleStatus status = LifecycleStatus.Pending)
    {
        var workOrder = new WorkOrder
        {
            AccountId = accountId,
            AssignTo = assignTo,
            InternalWONumber = number,
            LifecycleStatus = status,
            CreatedDate = Now.AddDays(-30)
        };
        context.workOrders.Add(workOrder);
        context.SaveChanges();
        return workOrder;
    }

    private static void Assigned(ApplicationDbContext context, WorkOrder workOrder, string? by, DateTime at, string field = "AssignTo")
    {
        context.WorkOrderAuditLogs.Add(new WorkOrderAuditLog
        {
            WorkOrderId = workOrder.Id,
            UserId = by,
            FieldName = field,
            OldValue = "",
            NewValue = workOrder.AssignTo,
            Action = "AssignmentChanged",
            CreatedAt = at
        });
        context.SaveChanges();
    }

    private static Comments Comment(ApplicationDbContext context, WorkOrder workOrder, string? by, string text, DateTime at,
        string? commenter = null)
    {
        var comment = new Comments
        {
            WorkerOrderId = workOrder.Id,
            UserId = by,
            Commenter = commenter,
            Commenttext = text,
            CommentType = "General",
            RecordType = "WorkOrder",
            CreatedDate = at
        };
        context.Comments.Add(comment);
        context.SaveChanges();
        return comment;
    }

    private static DispatchUpliftRequest Uplift(ApplicationDbContext context, WorkOrder workOrder, string requestedBy,
        string status, decimal amount, string? decidedBy, DateTime? decidedAt, string? note = null)
    {
        var dispatch = new Dispatch { WorkOrderId = workOrder.Id, Status = "Sent" };
        context.Dispatches.Add(dispatch);
        context.SaveChanges();
        var uplift = new DispatchUpliftRequest
        {
            DispatchId = dispatch.Id,
            RequestedNTE = amount,
            Status = status,
            createdby = requestedBy,
            DecidedAt = decidedAt,
            DecidedByUserId = decidedBy,
            DecisionNote = note,
            CreatedDate = Now.AddDays(-2)
        };
        context.DispatchUpliftRequests.Add(uplift);
        context.SaveChanges();
        return uplift;
    }

    private static IReadOnlyList<NotificationItemDto> Items(NotificationFeedDto feed, string reason)
        => feed.Sections.SingleOrDefault(section => section.Reason == reason)?.Items
           ?? Array.Empty<NotificationItemDto>();

    // ---- SH-288 new assignments ----

    [Fact]
    public async Task Assignment_BySomeoneElse_IsOneLowActivityItemThatOpensTheWorkOrder()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-100");
        Assigned(context, workOrder, Other, Now.AddHours(-3));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var item = Items(feed, NotificationReasons.Activity).Should().ContainSingle().Subject;
        item.Id.Should().Be($"new-assigned-{workOrder.Id}");
        item.Severity.Should().Be(NotificationSeverities.Low);
        item.RowType.Should().Be(NotificationRowTypes.Dismissable);
        item.Title.Should().Be("WO #WO-100 was assigned to you");
        item.Count.Should().Be(1);
        item.TriggeredAt.Should().Be(Now.AddHours(-3));
        item.TriggeredAt.Kind.Should().Be(DateTimeKind.Utc);
        item.Target.Kind.Should().Be(NotificationTargetKinds.WorkOrder);
        item.Target.WorkOrderId.Should().Be(workOrder.Id);
        item.Target.Tab.Should().Be(NotificationWorkOrderTabs.Info);
        feed.Sections.Single(s => s.Reason == NotificationReasons.Activity).Label.Should().Be("Recent activity");
    }

    [Fact]
    public async Task Assignments_MadeInOneAction_BecomeOneGroupedItemThatOpensTheUsersQueue()
    {
        using var context = NewContext();
        var first = AddWorkOrder(context, 1, Me, "WO-1");
        var second = AddWorkOrder(context, 1, Me, "WO-2");
        var third = AddWorkOrder(context, 1, Me, "WO-3");
        var later = AddWorkOrder(context, 1, Me, "WO-4");
        Assigned(context, first, Other, Now.AddHours(-5));
        Assigned(context, second, Other, Now.AddHours(-5).AddSeconds(20));
        Assigned(context, third, Other, Now.AddHours(-5).AddSeconds(50));
        // Same person, an hour later: a separate action.
        Assigned(context, later, Other, Now.AddHours(-4));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var items = Items(feed, NotificationReasons.Activity);
        items.Should().HaveCount(2);
        var grouped = items.Single(i => i.Count == 3);
        grouped.Id.Should().Be($"new-assigned-group-{first.Id}");
        grouped.Title.Should().Be("3 new work orders assigned to you");
        grouped.Severity.Should().Be(NotificationSeverities.Low);
        grouped.Target.Kind.Should().Be(NotificationTargetKinds.Queue);
        grouped.Target.Queue.Should().Be(NotificationQueues.AssignedToMe);
        grouped.WorkOrders.Select(w => w.Id).Should().BeEquivalentTo(new[] { first.Id, second.Id, third.Id });
        items.Single(i => i.Count == 1).Target.WorkOrderId.Should().Be(later.Id);
    }

    [Fact]
    public async Task Assignment_IsNotShownWhenSelfMadeStaleClosedOrReassignedAway()
    {
        using var context = NewContext();
        Assigned(context, AddWorkOrder(context, 1, Me, "SELF"), Me, Now.AddHours(-1));
        Assigned(context, AddWorkOrder(context, 1, Me, "STALE"), Other, Now.AddDays(-8));
        Assigned(context, AddWorkOrder(context, 1, Me, "DONE", LifecycleStatus.Completed), Other, Now.AddHours(-1));
        var movedAway = AddWorkOrder(context, 1, Me, "MOVED");
        Assigned(context, movedAway, Other, Now.AddHours(-2));
        movedAway.AssignTo = Other;
        Assigned(context, movedAway, Admin, Now.AddHours(-1));
        // Reassigned to me earlier, then someone re-saved it to me again recently: the latest entry counts.
        var reassigned = AddWorkOrder(context, 1, Me, "LATEST");
        Assigned(context, reassigned, Other, Now.AddDays(-9));
        Assigned(context, reassigned, Admin, Now.AddMinutes(-10));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        Items(feed, NotificationReasons.Activity).Should().ContainSingle()
            .Which.Target.WorkOrderId.Should().Be(reassigned.Id);
    }

    [Fact]
    public async Task Assignment_CountsLegacyAuditEntriesButNotUnauditedAssignees()
    {
        using var context = NewContext();
        var legacy = AddWorkOrder(context, 1, Me, "LEGACY");
        Assigned(context, legacy, Other, Now.AddDays(-1), field: "AssignedTo");
        // Assigned at some point with no audit trail: there is no assignment event to report.
        var unaudited = AddWorkOrder(context, 1, Me, "UNAUDITED");
        unaudited.CreatedDate = Now.AddHours(-2);
        context.SaveChanges();

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        Items(feed, NotificationReasons.Activity).Should().ContainSingle()
            .Which.Target.WorkOrderId.Should().Be(legacy.Id);
    }

    // ---- SH-289 comments and mentions ----

    [Fact]
    public async Task Comments_BySomeoneElseOnMyWorkOrder_GroupIntoOneMediumItemOnTheCommentsTab()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-7");
        var first = Comment(context, workOrder, Other, "Vendor is on site", Now.AddHours(-3));
        var second = Comment(context, workOrder, null, "Reply from the email thread", Now.AddHours(-2), commenter: "Site Lead");

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var item = Items(feed, NotificationReasons.Activity).Should().ContainSingle().Subject;
        item.Id.Should().Be($"comments-{workOrder.Id}-{second.Id}");
        item.Title.Should().Be("2 new comments on WO #WO-7");
        item.Severity.Should().Be(NotificationSeverities.Medium);
        item.Count.Should().Be(1);
        // The group starts at its earliest comment; the Comments tab highlights from there.
        item.TriggeredAt.Should().Be(first.CreatedDate!.Value);
        item.TriggeredAt.Kind.Should().Be(DateTimeKind.Utc);
        item.Target.WorkOrderId.Should().Be(workOrder.Id);
        item.Target.Tab.Should().Be(NotificationWorkOrderTabs.Comments);
    }

    [Fact]
    public async Task Comment_Single_ShowsTheCommenterAndAOneLinePreview()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-8");
        var text = "Please ask @[" + Admin + ":Ada Stone] about the gate code\nbefore the vendor arrives, because the "
            + "site closes early on Fridays and security will not let anyone in after four";
        Comment(context, workOrder, Other, text, Now.AddHours(-1));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var title = Items(feed, NotificationReasons.Activity).Should().ContainSingle().Subject.Title;
        title.Should().StartWith("Omar Diaz commented on WO #WO-8: “Please ask @Ada Stone about the gate code before");
        title.Should().EndWith("…”");
        NotificationActivityItems.Preview(text).Should().HaveLength(80);
    }

    [Fact]
    public async Task Comments_NeverNotifyTheirAuthorAndClearOnceTheUserReplies()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-9");
        Comment(context, workOrder, Me, "My own note", Now.AddHours(-5));
        Comment(context, workOrder, Other, "Answered already", Now.AddHours(-4));
        Comment(context, workOrder, Me, "Thanks", Now.AddHours(-3));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);
        Items(feed, NotificationReasons.Activity).Should().BeEmpty();

        var unanswered = Comment(context, workOrder, Other, "One more thing", Now.AddHours(-1));
        feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);
        var item = Items(feed, NotificationReasons.Activity).Should().ContainSingle().Subject;
        item.Title.Should().Be("Omar Diaz commented on WO #WO-9: “One more thing”");
        item.TriggeredAt.Should().Be(unanswered.CreatedDate!.Value);
    }

    [Fact]
    public async Task Comments_ReachPriorCommentersButNotBystanders()
    {
        using var context = NewContext();
        // Someone else's work order that I commented on earlier this month.
        var joined = AddWorkOrder(context, 1, Other, "JOINED");
        Comment(context, joined, Me, "Adding context", Now.AddDays(-20));
        Comment(context, joined, Other, "Follow-up", Now.AddHours(-2));
        var bystander = AddWorkOrder(context, 1, Other, "NOT-MINE");
        Comment(context, bystander, Admin, "Internal note", Now.AddHours(-2));
        var stale = AddWorkOrder(context, 1, Me, "OLD");
        Comment(context, stale, Other, "Last week", Now.AddDays(-8));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        Items(feed, NotificationReasons.Activity).Should().ContainSingle()
            .Which.Target.WorkOrderId.Should().Be(joined.Id);
        // The owner of NOT-MINE is notified of the admin's note, and not of their own follow-up.
        var ownerFeed = await NewService(context).GetFeedAsync(Dispatcher(userId: Other), CancellationToken.None);
        Items(ownerFeed, NotificationReasons.Activity).Should().ContainSingle()
            .Which.Target.WorkOrderId.Should().Be(bystander.Id);
    }

    [Fact]
    public async Task Mention_IsAHighMentionsItemAndIsNotAlsoCountedAsAComment()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-11");
        Comment(context, workOrder, Other, "Plain update", Now.AddHours(-3));
        var mention = Comment(context, workOrder, Other, "@[" + Me + ":Maya Reed] can you confirm?", Now.AddHours(-2));
        // A mention reaches the user even on a work order they are not otherwise part of.
        var elsewhere = AddWorkOrder(context, 1, Other, "WO-12");
        Comment(context, elsewhere, Admin, "Looping in @[" + Me + ":Maya Reed]", Now.AddHours(-1));

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var mentions = Items(feed, NotificationReasons.Mentions);
        mentions.Should().HaveCount(2);
        var onMine = mentions.Single(i => i.Target.WorkOrderId == workOrder.Id);
        onMine.Id.Should().Be($"mention-{mention.Id}");
        onMine.Title.Should().Be("Omar Diaz mentioned you on WO #WO-11");
        onMine.Severity.Should().Be(NotificationSeverities.High);
        onMine.Target.Tab.Should().Be(NotificationWorkOrderTabs.Comments);
        onMine.TriggeredAt.Should().Be(mention.CreatedDate!.Value);
        mentions.Single(i => i.Target.WorkOrderId == elsewhere.Id).Title.Should().Be("Ada Stone mentioned you on WO #WO-12");

        var activity = Items(feed, NotificationReasons.Activity).Should().ContainSingle().Subject;
        activity.Title.Should().Be("Omar Diaz commented on WO #WO-11: “Plain update”");
        feed.Sections.Select(s => s.Reason).Should().ContainInOrder(NotificationReasons.Mentions, NotificationReasons.Activity);
    }

    [Fact]
    public void MentionsUser_MatchesOnlyTheUsersOwnToken()
    {
        NotificationActivityItems.MentionsUser("hi @[" + Me + ":Maya Reed]", Me).Should().BeTrue();
        NotificationActivityItems.MentionsUser("hi @[" + Me + "x:Someone Else]", Me).Should().BeFalse();
        NotificationActivityItems.MentionsUser("hi @Maya Reed", Me).Should().BeFalse();
        NotificationActivityItems.MentionsUser(null, Me).Should().BeFalse();
    }

    // ---- SH-215 uplift decisions ----

    [Fact]
    public async Task UpliftDecisions_OnMyRequests_ShowAmountAndReasonAndOpenTheUplifts()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Other, "WO-20");
        var approved = Uplift(context, workOrder, Me, "Approved", 1250m, Admin, Now.AddHours(-3));
        var rejected = Uplift(context, workOrder, Me, "Rejected", 400m, Admin, Now.AddHours(-2), "Quote does not match the scope agreed");
        var revoked = Uplift(context, workOrder, Me, "Revoked", 90.5m, Admin, Now.AddHours(-1), "Duplicate of an earlier uplift");
        var legacy = Uplift(context, workOrder, Me, "Denied", 75m, Admin, Now.AddHours(-4), "Old wording");

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        var items = Items(feed, NotificationReasons.Activity);
        items.Should().HaveCount(4);
        var approvedItem = items.Single(i => i.Id == $"uplift-approved-{approved.Id}");
        approvedItem.Title.Should().Be("Your $1,250.00 uplift on WO #WO-20 was approved");
        approvedItem.Severity.Should().Be(NotificationSeverities.Medium);
        approvedItem.Target.Tab.Should().Be(NotificationWorkOrderTabs.Uplifts);
        approvedItem.Target.WorkOrderId.Should().Be(workOrder.Id);
        var rejectedItem = items.Single(i => i.Id == $"uplift-rejected-{rejected.Id}");
        rejectedItem.Title.Should().Be("Your $400.00 uplift on WO #WO-20 was rejected: “Quote does not match the scope agreed”");
        rejectedItem.Severity.Should().Be(NotificationSeverities.High);
        var revokedItem = items.Single(i => i.Id == $"uplift-revoked-{revoked.Id}");
        revokedItem.Title.Should().Be("Your $90.50 uplift on WO #WO-20 was revoked: “Duplicate of an earlier uplift”");
        revokedItem.Severity.Should().Be(NotificationSeverities.High);
        revokedItem.TriggeredAt.Should().Be(Now.AddHours(-1));
        items.Single(i => i.Id == $"uplift-rejected-{legacy.Id}").Severity.Should().Be(NotificationSeverities.High);
        // The requester need not be the dispatcher who owns the work order.
        var ownerFeed = await NewService(context).GetFeedAsync(Dispatcher(userId: Other), CancellationToken.None);
        Items(ownerFeed, NotificationReasons.Activity).Should().BeEmpty();
    }

    [Fact]
    public async Task UpliftDecisions_SkipPendingAutoApprovedSelfRevokedAndStaleRequests()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Me, "WO-21");
        Uplift(context, workOrder, Me, "Pending", 100m, null, null);
        Uplift(context, workOrder, Me, "NoApprovalRequired", 100m, null, null);
        Uplift(context, workOrder, Me, "Revoked", 100m, Me, Now.AddHours(-1));
        Uplift(context, workOrder, Me, "Approved", 100m, Admin, Now.AddDays(-8));
        var deleted = Uplift(context, workOrder, Me, "Approved", 100m, Admin, Now.AddHours(-1));
        deleted.IsDeleted = true;
        context.SaveChanges();

        var feed = await NewService(context).GetFeedAsync(Dispatcher(), CancellationToken.None);

        Items(feed, NotificationReasons.Activity).Should().BeEmpty();
    }

    // ---- scope ----

    [Fact]
    public async Task PersonalItems_NeverCrossAccounts()
    {
        using var context = NewContext();
        var foreign = AddWorkOrder(context, 2, Me, "FOREIGN");
        Assigned(context, foreign, Other, Now.AddHours(-1));
        Comment(context, foreign, Other, "@[" + Me + ":Maya Reed] hello", Now.AddHours(-1));
        Uplift(context, foreign, Me, "Approved", 10m, Admin, Now.AddHours(-1));

        var sameUserOtherAccount = await NewService(context).GetFeedAsync(Dispatcher(accountId: 1), CancellationToken.None);
        sameUserOtherAccount.Sections.Should().BeEmpty();

        var inAccount = await NewService(context).GetFeedAsync(Dispatcher(accountId: 2), CancellationToken.None);
        Items(inAccount, NotificationReasons.Mentions).Should().ContainSingle();
        Items(inAccount, NotificationReasons.Activity).Should().HaveCount(2);
    }

    [Fact]
    public async Task PersonalItems_ReachEveryFeedRoleByUserId()
    {
        using var context = NewContext();
        var workOrder = AddWorkOrder(context, 1, Other, "WO-30");
        Comment(context, workOrder, Other, "@[" + Admin + ":Ada Stone] please approve", Now.AddHours(-1));

        var adminFeed = await NewService(context).GetFeedAsync(User(1, "Admin", Admin), CancellationToken.None);
        Items(adminFeed, NotificationReasons.Mentions).Should().ContainSingle()
            .Which.Title.Should().Be("Omar Diaz mentioned you on WO #WO-30");

        var managerFeed = await NewService(context).GetFeedAsync(User(1, "Manager", "manager-1"), CancellationToken.None);
        Items(managerFeed, NotificationReasons.Mentions).Should().BeEmpty();
        Items(managerFeed, NotificationReasons.Activity).Should().BeEmpty();
    }

    [Fact]
    public async Task PersonalQueries_ForwardCancellation()
    {
        using var context = NewContext();
        var data = new NotificationFeedDataService(context);
        var scope = new NotificationPersonalScope(1, Me);
        using var cancelled = new CancellationTokenSource();
        cancelled.Cancel();

        await FluentActions.Awaiting(() => data.GetRecentAssignmentsAsync(scope, Now, 10, cancelled.Token))
            .Should().ThrowAsync<OperationCanceledException>();
        await FluentActions.Awaiting(() => data.GetUnansweredCommentsAsync(scope, Now, 10, cancelled.Token))
            .Should().ThrowAsync<OperationCanceledException>();
        await FluentActions.Awaiting(() => data.GetUpliftDecisionsAsync(scope, Now, 10, cancelled.Token))
            .Should().ThrowAsync<OperationCanceledException>();
    }
}