using System.Security.Claims;
using JobTrackerApi.Controllers;
using JobTrackerApi.Data;
using JobTrackerApi.Models;
using JobTrackerApi.Services;
using JobTrackerApi.Tests.TestSupport;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;

namespace JobTrackerApi.Tests;

// Career Workspace foundation, Phase F2 (career-workspace-implementation-roadmap.md). Every
// TailoredCvDraft save should dual-write a CvVariant + CvVersion + TailoredApplication without
// changing TailoredCvDraft's own behavior -- these tests lock in that seam.
public sealed class CvVariantSyncTests
{
    [Fact]
    public async Task SaveTailoredCvDraft_creates_a_variant_version_and_application_link()
    {
        await using var db = TestHostFactory.CreateInMemoryDb();
        var job = await SeedJobAsync(db);
        var controller = CreateController(db, "user-1");

        var result = await controller.SaveTailoredCvDraft(job.Id, new JobApplicationsController.SaveTailoredCvDraftRequest(
            "ats-minimal", "Backend Engineer", new List<string> { "Built things." }, new List<string> { "C#" },
            new List<TailoredCvExperienceItem>(), new List<TailoredCvEducationItem>(), new List<TailoredCvCustomSection>(), null, "edited"), CancellationToken.None);

        Assert.IsType<NoContentResult>(result);

        var variant = Assert.Single(db.CvVariants.IgnoreQueryFilters().Where(x => x.OwnerUserId == "user-1"));
        Assert.Equal(1, variant.Version);
        Assert.Contains("Backend Developer", variant.Name);

        var link = Assert.Single(db.TailoredApplications.IgnoreQueryFilters().Where(x => x.JobApplicationId == job.Id));
        Assert.Equal(variant.Id, link.CvVariantId);

        var version = Assert.Single(db.CvVersions.IgnoreQueryFilters().Where(x => x.CvVariantId == variant.Id));
        Assert.Equal(1, version.Version);
    }

    [Fact]
    public async Task SaveTailoredCvDraft_reuses_the_same_variant_on_subsequent_saves()
    {
        await using var db = TestHostFactory.CreateInMemoryDb();
        var job = await SeedJobAsync(db);
        var controller = CreateController(db, "user-1");

        var request = new JobApplicationsController.SaveTailoredCvDraftRequest(
            "ats-minimal", "Backend Engineer", new List<string> { "Built things." }, new List<string> { "C#" },
            new List<TailoredCvExperienceItem>(), new List<TailoredCvEducationItem>(), new List<TailoredCvCustomSection>(), null, "edited");

        await controller.SaveTailoredCvDraft(job.Id, request, CancellationToken.None);
        await controller.SaveTailoredCvDraft(job.Id, request with { Headline = "Updated headline" }, CancellationToken.None);

        var variant = Assert.Single(db.CvVariants.IgnoreQueryFilters().Where(x => x.OwnerUserId == "user-1"));
        Assert.Equal(2, variant.Version);

        var links = db.TailoredApplications.IgnoreQueryFilters().Where(x => x.JobApplicationId == job.Id).ToList();
        Assert.Single(links);

        var versions = db.CvVersions.IgnoreQueryFilters().Where(x => x.CvVariantId == variant.Id).ToList();
        Assert.Equal(2, versions.Count);
    }

    private static async Task<JobApplication> SeedJobAsync(JobTrackerContext db)
    {
        var company = new Company { Name = "Acme", OwnerUserId = "user-1" };
        db.Companies.Add(company);
        db.Users.Add(new ApplicationUser { Id = "user-1", UserName = "user@example.test", Email = "user@example.test" });
        await db.SaveChangesAsync();

        var job = new JobApplication { JobTitle = "Backend Developer", CompanyId = company.Id, OwnerUserId = "user-1" };
        db.JobApplications.Add(job);
        await db.SaveChangesAsync();
        return job;
    }

    private static JobApplicationsController CreateController(JobTrackerContext db, string userId)
    {
        var user = db.Users.AsNoTracking().FirstOrDefault(x => x.Id == userId);
        var controller = new JobApplicationsController(
            db,
            Mock.Of<ISummarizerService>(),
            Mock.Of<IAppEmailSender>(),
            TestHostFactory.CreateUserManager(user).Object,
            NullLogger<JobApplicationsController>.Instance,
            Mock.Of<ICvTemplateRenderer>(),
            Mock.Of<ICvPdfExporter>());
        controller.ControllerContext = new ControllerContext
        {
            HttpContext = new DefaultHttpContext
            {
                User = new ClaimsPrincipal(new ClaimsIdentity(new[]
                {
                    new Claim(ClaimTypes.NameIdentifier, userId)
                }, "test"))
            }
        };
        return controller;
    }
}