using System.Reflection;
using System.Text.Json;
using JobTrackerApi.Controllers;
using JobTrackerApi.Models;
using JobTrackerApi.Services;
using JobTrackerApi.Tests.TestSupport;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Moq;
using Xunit;

namespace JobTrackerApi.Tests;

public sealed class CvCorpusHarnessTests
{
    private static readonly string CorpusRoot = "/home/pi/cvs";

    [Fact]
    public async Task Local_cv_corpus_harness_produces_repeatable_parse_report_when_available()
    {
        if (!Directory.Exists(CorpusRoot)) return;

        var files = Directory.EnumerateFiles(CorpusRoot, "*.*", SearchOption.TopDirectoryOnly)
            .Where(path => path.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase)
                || path.EndsWith(".docx", StringComparison.OrdinalIgnoreCase)
                || path.EndsWith(".txt", StringComparison.OrdinalIgnoreCase)
                || path.EndsWith(".md", StringComparison.OrdinalIgnoreCase))
            .OrderBy(path => path, StringComparer.OrdinalIgnoreCase)
            .Take(8)
            .ToList();

        if (files.Count == 0) return;

        var user = new ApplicationUser { Id = "user-1", ProfileCvText = "seed" };
        var userManager = TestHostFactory.CreateUserManager();
        userManager.Setup(x => x.GetUserAsync(It.IsAny<System.Security.Claims.ClaimsPrincipal>())).ReturnsAsync(user);
        userManager.Setup(x => x.UpdateAsync(It.IsAny<ApplicationUser>())).ReturnsAsync(IdentityResult.Success);

        var aiService = new Mock<ISummarizerService>();
        aiService.Setup(x => x.SummarizeSectionAsync(It.Is<string>(instruction => instruction.Contains("Extract this CV into structured JSON", StringComparison.Ordinal)), It.IsAny<string>(), 3200, 900)).ReturnsAsync(string.Empty);
        aiService.Setup(x => x.SummarizeSectionAsync(It.Is<string>(instruction => instruction.Contains("Reconstruct this CV text extracted from a PDF", StringComparison.Ordinal)), It.IsAny<string>(), 2800, 900)).ReturnsAsync((string _, string text, int _, int __) => text);

        await using var db = TestHostFactory.CreateInMemoryDb();
        var paths = CreatePaths();
        var controller = new ProfileCvController(userManager.Object, aiService.Object, db, paths, NoOpCvAiClassifier.Instance)
        {
            ControllerContext = new ControllerContext { HttpContext = new DefaultHttpContext() }
        };

        var extractMethod = typeof(ProfileCvController).GetMethod("ExtractTextAsync", BindingFlags.NonPublic | BindingFlags.Static);
        var buildMethod = typeof(ProfileCvController).GetMethod("BuildStructuredCvAsync", BindingFlags.NonPublic | BindingFlags.Instance);
        Assert.NotNull(extractMethod);
        Assert.NotNull(buildMethod);

        var report = new List<object>();
        foreach (var path in files)
        {
            await using var stream = File.OpenRead(path);
            var fileName = Path.GetFileName(path);
            var formFile = new FormFile(stream, 0, stream.Length, "file", fileName)
            {
                Headers = new HeaderDictionary(),
                ContentType = GuessContentType(path)
            };

            var extension = Path.GetExtension(path);
            var extractTask = (Task<string>)extractMethod!.Invoke(null, new object[] { formFile, extension })!;
            var text = await extractTask;
            Assert.False(string.IsNullOrWhiteSpace(text));

            var buildTask = (Task<StructuredCvProfile>)buildMethod!.Invoke(controller, new object[] { text, CancellationToken.None })!;
            var structured = await buildTask;
            Assert.NotNull(structured);

            report.Add(new
            {
                file = fileName,
                characters = text.Length,
                contactLocation = structured.Contact.Location,
                firstJob = structured.Jobs.FirstOrDefault()?.Title,
                firstJobLocation = structured.Jobs.FirstOrDefault()?.Location,
                firstEducation = structured.Education.FirstOrDefault()?.Qualification,
                firstEducationLocation = structured.Education.FirstOrDefault()?.Location,
                suspiciousLocations = structured.Jobs.Select(job => job.Location)
                    .Concat(structured.Education.Select(education => education.Location))
                    .Append(structured.Contact.Location)
                    .Where(value => !string.IsNullOrWhiteSpace(value))
                    .Where(LooksSuspiciousLocation)
                    .ToList()
            });
        }

        var reportPath = Path.Combine(Path.GetTempPath(), $"jobtracker-cv-corpus-{DateTime.UtcNow:yyyyMMddHHmmss}.json");
        await File.WriteAllTextAsync(reportPath, JsonSerializer.Serialize(report, new JsonSerializerOptions { WriteIndented = true }));

        Assert.True(report.Count > 0);
    }

    private static bool LooksSuspiciousLocation(string? value)
    {
        if (string.IsNullOrWhiteSpace(value)) return false;
        return value.Contains("Python", StringComparison.OrdinalIgnoreCase)
            || value.Contains("Ruby", StringComparison.OrdinalIgnoreCase)
            || value.Contains(" S A L E S ", StringComparison.OrdinalIgnoreCase)
            || value.Any(char.IsDigit);
    }

    private static string GuessContentType(string path)
    {
        return Path.GetExtension(path).ToLowerInvariant() switch
        {
            ".pdf" => "application/pdf",
            ".docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            ".md" => "text/markdown",
            _ => "text/plain"
        };
    }

    private static AppPaths CreatePaths()
    {
        var tempRoot = Path.Combine(Path.GetTempPath(), $"jobtracker-cv-corpus-{Guid.NewGuid():N}");
        Directory.CreateDirectory(tempRoot);

        var config = new ConfigurationBuilder()
            .AddInMemoryCollection(new Dictionary<string, string?>
            {
                ["Data:Root"] = tempRoot,
                ["Data:CvArtifactsRoot"] = Path.Combine(tempRoot, "CvArtifacts")
            })
            .Build();

        var env = new Mock<IHostEnvironment>();
        env.SetupGet(x => x.ContentRootPath).Returns(tempRoot);
        return new AppPaths(config, env.Object);
    }
}