using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Workflow.Application.Features.Notifications;
using Workflow.Domain.Entities;
using Workflow.Domain.Exceptions;
using Workflow.Infrastructure.Persistence;
using Xunit;

namespace Workflow.Tests.Notifications;

public class NotificationQueryTests
{
    private static WorkflowDbContext CreateDbContext()
    {
        var options = new DbContextOptionsBuilder<WorkflowDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;
        return new WorkflowDbContext(options);
    }

    private static Notification NewNotification(
        Guid? recipientUserId = null, string? recipientRole = null,
        bool isRead = false, string category = "task-arrived")
        => new()
        {
            Id = Guid.NewGuid(),
            RecipientUserId = recipientUserId,
            RecipientRole = recipientRole,
            Title = "T",
            Content = "C",
            Category = category,
            IsRead = isRead,
            CreatedAt = DateTime.UtcNow
        };

    [Fact]
    public async Task GetNotifications_ReturnsBothUserAndRoleTargeted()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        db.Notifications.AddRange(
            NewNotification(recipientUserId: userId),              // 给该用户
            NewNotification(recipientRole: "manager"),              // 给 manager 角色
            NewNotification(recipientUserId: Guid.NewGuid()),       // 给别人
            NewNotification(recipientRole: "hr"));                  // 给别的角色
        await db.SaveChangesAsync();

        var handler = new GetNotificationsQueryHandler(db);
        var result = await handler.Handle(
            new GetNotificationsQuery(userId, ["manager"], false, 1, 20), default);

        result.Items.Should().HaveCount(2);
        result.Total.Should().Be(2);
    }

    [Fact]
    public async Task GetNotifications_UnreadOnly_FiltersReadOnes()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        db.Notifications.AddRange(
            NewNotification(recipientUserId: userId, isRead: false),
            NewNotification(recipientUserId: userId, isRead: false),
            NewNotification(recipientUserId: userId, isRead: true));
        await db.SaveChangesAsync();

        var handler = new GetNotificationsQueryHandler(db);
        var result = await handler.Handle(
            new GetNotificationsQuery(userId, [], true, 1, 20), default);

        result.Items.Should().HaveCount(2);
    }

    [Fact]
    public async Task GetUnreadCount_CountsUserAndRoleTargeted()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        db.Notifications.AddRange(
            NewNotification(recipientUserId: userId, isRead: false),
            NewNotification(recipientUserId: userId, isRead: true),
            NewNotification(recipientRole: "manager", isRead: false),
            NewNotification(recipientRole: "manager", isRead: false));
        await db.SaveChangesAsync();

        var handler = new GetUnreadNotificationCountHandler(db);
        var count = await handler.Handle(
            new GetUnreadNotificationCountQuery(userId, ["manager"]), default);

        count.Should().Be(3); // 1 user + 2 role
    }

    [Fact]
    public async Task MarkNotificationRead_SetsReadAndReadAt()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        var n = NewNotification(recipientUserId: userId, isRead: false);
        db.Notifications.Add(n);
        await db.SaveChangesAsync();

        var handler = new MarkNotificationReadCommandHandler(db);
        await handler.Handle(new MarkNotificationReadCommand(n.Id, userId), default);

        var updated = await db.Notifications.FindAsync(n.Id);
        updated!.IsRead.Should().BeTrue();
        updated.ReadAt.Should().NotBeNull();
    }

    [Fact]
    public async Task MarkNotificationRead_NotOwnNotification_Throws()
    {
        var db = CreateDbContext();
        var n = NewNotification(recipientUserId: Guid.NewGuid());
        db.Notifications.Add(n);
        await db.SaveChangesAsync();

        var handler = new MarkNotificationReadCommandHandler(db);
        var act = () => handler.Handle(
            new MarkNotificationReadCommand(n.Id, Guid.NewGuid()), default);

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

    [Fact]
    public async Task MarkAllNotificationsRead_MarksAllUserAndRoleTargeted()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        db.Notifications.AddRange(
            NewNotification(recipientUserId: userId, isRead: false),
            NewNotification(recipientRole: "manager", isRead: false),
            NewNotification(recipientRole: "hr", isRead: false));  // 不属于该用户
        await db.SaveChangesAsync();

        var handler = new MarkAllNotificationsReadCommandHandler(db);
        await handler.Handle(
            new MarkAllNotificationsReadCommand(userId, ["manager"]), default);

        var all = await db.Notifications.ToListAsync();
        all.Count(n => n.IsRead).Should().Be(2);  // user + manager 两读，hr 仍未读
        all.First(n => n.RecipientRole == "hr").IsRead.Should().BeFalse();
    }
}