using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using Workflow.Application.Notifications;
using Workflow.Domain.Entities;
using Workflow.Domain.Enums;
using Workflow.Infrastructure.Persistence;
using Xunit;

using TaskStatus = Workflow.Domain.Enums.TaskStatus;

namespace Workflow.Tests.Notifications;

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

    private static NotificationOptions DefaultOptions() => new()
    {
        Webhook = new NotificationOptions.WebhookSection
        {
            AllowedHosts = [], // 默认禁用 Webhook，专注测站内信
            DefaultUrl = ""
        }
    };

    private static WorkflowTask NewTask(Guid? assigneeId = null, string? role = null)
    {
        var instanceId = Guid.NewGuid();
        return new WorkflowTask
        {
            Id = Guid.NewGuid(),
            InstanceId = instanceId,
            TokenId = Guid.NewGuid(),
            NodeId = Guid.NewGuid(),
            Title = "测试任务",
            AssigneeId = assigneeId,
            AssigneeRole = role,
            Type = TaskType.Approval,
            Status = TaskStatus.Pending
        };
    }

    private static WorkflowInstance NewInstance(Guid instanceId, Guid initiatorId)
        => new()
        {
            Id = instanceId,
            DefinitionId = Guid.NewGuid(),
            Title = "测试流程",
            InitiatorId = initiatorId,
            Status = InstanceStatus.Running
        };

    [Fact]
    public async Task NotifyTaskArrived_ByUserId_CreatesNotificationForAssignee()
    {
        var db = CreateDbContext();
        var assigneeId = Guid.NewGuid();
        var task = NewTask(assigneeId: assigneeId);
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, Guid.NewGuid()));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskArrivedAsync(task);
        await db.SaveChangesAsync();

        var notifications = await db.Notifications.ToListAsync();
        notifications.Should().HaveCount(1);
        notifications[0].RecipientUserId.Should().Be(assigneeId);
        notifications[0].RecipientRole.Should().BeNull();
        notifications[0].Category.Should().Be("task-arrived");
        notifications[0].IsRead.Should().BeFalse();
        notifications[0].RelatedTaskId.Should().Be(task.Id);
    }

    [Fact]
    public async Task NotifyTaskArrived_ByRole_CreatesRoleScopedNotification()
    {
        var db = CreateDbContext();
        var task = NewTask(role: "manager");
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, Guid.NewGuid()));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskArrivedAsync(task);
        await db.SaveChangesAsync();

        var n = await db.Notifications.SingleAsync();
        n.RecipientRole.Should().Be("manager");
        n.RecipientUserId.Should().BeNull();
    }

    [Fact]
    public async Task NotifyTaskApproved_NotifiesBothAssigneeAndInitiator()
    {
        var db = CreateDbContext();
        var assigneeId = Guid.NewGuid();
        var initiatorId = Guid.NewGuid();
        var task = NewTask(assigneeId: assigneeId);
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, initiatorId));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskApprovedAsync(task);
        await db.SaveChangesAsync();

        var notifications = await db.Notifications.ToListAsync();
        notifications.Should().HaveCount(2);
        notifications.Should().Contain(n => n.RecipientUserId == assigneeId);
        notifications.Should().Contain(n => n.RecipientUserId == initiatorId);
        notifications.Should().OnlyContain(n => n.Category == "approved");
    }

    [Fact]
    public async Task NotifyTaskApproved_AssigneeIsInitiator_AvoidsDuplicate()
    {
        var db = CreateDbContext();
        var userId = Guid.NewGuid();
        var task = NewTask(assigneeId: userId);
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, userId));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskApprovedAsync(task);
        await db.SaveChangesAsync();

        var notifications = await db.Notifications.ToListAsync();
        notifications.Should().HaveCount(1, "受理人与发起人相同时不应重复通知");
    }

    [Fact]
    public async Task NotifyTaskRejected_NotifiesInitiator()
    {
        var db = CreateDbContext();
        var initiatorId = Guid.NewGuid();
        var task = NewTask(role: "manager");
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, initiatorId));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskRejectedAsync(task);
        await db.SaveChangesAsync();

        var n = await db.Notifications.SingleAsync(x => x.RecipientUserId == initiatorId);
        n.Category.Should().Be("rejected");
    }

    [Fact]
    public async Task NotifyTaskTimeout_AutoApproved_UsesCorrectCategoryAndText()
    {
        var db = CreateDbContext();
        var task = NewTask(assigneeId: Guid.NewGuid());
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, Guid.NewGuid()));
        await db.SaveChangesAsync();

        var svc = new NotificationService(db, Options.Create(DefaultOptions()));
        await svc.NotifyTaskTimeoutAsync(task, autoApproved: true);
        await db.SaveChangesAsync();

        var notifications = await db.Notifications.ToListAsync();
        notifications.Should().HaveCountGreaterThanOrEqualTo(1);
        notifications.Should().OnlyContain(n => n.Category == "timeout-approved");
        notifications.Should().OnlyContain(n => n.Title.Contains("自动通过"));
    }

    [Fact]
    public async Task Notify_WithWebhookConfigured_CreatesWebhookDeliveryPending()
    {
        var db = CreateDbContext();
        var task = NewTask(assigneeId: Guid.NewGuid());
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, Guid.NewGuid()));
        await db.SaveChangesAsync();

        var options = new NotificationOptions
        {
            Webhook = new NotificationOptions.WebhookSection
            {
                AllowedHosts = ["example.com"],
                DefaultUrl = "https://example.com/hook"
            }
        };
        var svc = new NotificationService(db, Options.Create(options));
        await svc.NotifyTaskArrivedAsync(task);
        await db.SaveChangesAsync();

        var delivery = await db.WebhookDeliveries.SingleAsync();
        delivery.Status.Should().Be("pending");
        delivery.Url.Should().Be("https://example.com/hook");
        delivery.Attempts.Should().Be(0);
        delivery.Payload.Should().Contain("task-arrived");
    }

    [Theory]
    [InlineData("https://example.com/hook", true)]
    [InlineData("http://localhost:8080/hook", false)]          // localhost 拒绝
    [InlineData("http://127.0.0.1/hook", false)]                // 回环 IP 拒绝
    [InlineData("http://10.0.0.5/hook", false)]                 // 私有网段拒绝
    [InlineData("http://192.168.1.1/hook", false)]              // 私有网段拒绝
    [InlineData("not-a-url", false)]                            // 非法 URL 拒绝
    public void IsHostAllowed_EnforcesSsrfProtection(string url, bool expected)
    {
        var db = CreateDbContext();
        var options = new NotificationOptions
        {
            Webhook = new NotificationOptions.WebhookSection
            {
                AllowedHosts = ["example.com"]
            }
        };
        var svc = new NotificationService(db, Options.Create(options));

        svc.IsHostAllowed(url).Should().Be(expected);
    }

    [Fact]
    public async Task Notify_WebhookHostNotInAllowlist_SkipsWebhookDelivery()
    {
        var db = CreateDbContext();
        var task = NewTask(assigneeId: Guid.NewGuid());
        db.WorkflowInstances.Add(NewInstance(task.InstanceId, Guid.NewGuid()));
        await db.SaveChangesAsync();

        // DefaultUrl 指向不在白名单的域
        var options = new NotificationOptions
        {
            Webhook = new NotificationOptions.WebhookSection
            {
                AllowedHosts = ["allowed.com"],
                DefaultUrl = "https://evil.com/hook"
            }
        };
        var svc = new NotificationService(db, Options.Create(options));
        await svc.NotifyTaskArrivedAsync(task);
        await db.SaveChangesAsync();

        // 站内信仍创建（必达），但 Webhook 因 SSRF 防护被跳过
        (await db.Notifications.CountAsync()).Should().Be(1);
        (await db.WebhookDeliveries.CountAsync()).Should().Be(0);
    }
}