using System.Net;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using SVSim.Database;
using SVSim.Database.Models;
using SVSim.UnitTests.Infrastructure;

namespace SVSim.UnitTests.Controllers;

public class UserMyPageControllerTests
{
    private static StringContent JsonBody(string json) => new(json, Encoding.UTF8, "application/json");

    private static async Task<Viewer> LoadViewerWithRotation(SVSimTestFactory factory, long viewerId)
    {
        using var scope = factory.Services.CreateScope();
        var ctx = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
        return await ctx.Viewers
            .Include(v => v.MyPageBgRotation)
            .AsNoTracking()
            .FirstAsync(v => v.Id == viewerId);
    }

    [Test]
    public async Task Update_persists_select_type_and_single_bg()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var body = JsonBody("""
            {"select_type":1,"mypage_id":"1213410310","mypage_id_list":[]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        var raw = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), raw);

        var viewer = await LoadViewerWithRotation(factory, viewerId);
        Assert.That(viewer.MyPageBgSelectType, Is.EqualTo(1));
        Assert.That(viewer.MyPageBgId, Is.EqualTo(1213410310));
        Assert.That(viewer.MyPageBgRotation, Is.Empty);
    }

    [Test]
    public async Task Update_persists_rotation_pool_in_slot_order()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var body = JsonBody("""
            {"select_type":2,"mypage_id":"0","mypage_id_list":["1211410310","1212410310","1213410310"]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));

        var viewer = await LoadViewerWithRotation(factory, viewerId);
        var pool = viewer.MyPageBgRotation.OrderBy(r => r.Slot).Select(r => r.BgId).ToList();
        Assert.That(pool, Is.EqualTo(new[] { 1211410310, 1212410310, 1213410310 }));
    }

    [Test]
    public async Task Update_overwrites_previous_rotation_atomically()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();

        // Seed a 5-entry rotation directly.
        using (var seedScope = factory.Services.CreateScope())
        {
            var ctx = seedScope.ServiceProvider.GetRequiredService<SVSimDbContext>();
            var viewer = await ctx.Viewers.Include(v => v.MyPageBgRotation).FirstAsync(v => v.Id == viewerId);
            for (int slot = 0; slot < 5; slot++)
            {
                viewer.MyPageBgRotation.Add(new MyPageBgRotationEntry { Slot = slot, BgId = 9000 + slot });
            }
            await ctx.SaveChangesAsync();
        }

        using var client = factory.CreateAuthenticatedClient(viewerId);
        var body = JsonBody("""
            {"select_type":2,"mypage_id":"0","mypage_id_list":["1001","1002","1003"]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));

        var viewer2 = await LoadViewerWithRotation(factory, viewerId);
        var pool = viewer2.MyPageBgRotation.OrderBy(r => r.Slot).Select(r => r.BgId).ToList();
        Assert.That(pool, Is.EqualTo(new[] { 1001, 1002, 1003 }),
            "old slots 3-4 should have been deleted, not orphaned");
    }

    [Test]
    public async Task Update_with_empty_mypage_id_falls_back_to_zero()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var body = JsonBody("""
            {"select_type":0,"mypage_id":"","mypage_id_list":[]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));

        var viewer = await LoadViewerWithRotation(factory, viewerId);
        Assert.That(viewer.MyPageBgSelectType, Is.EqualTo(0));
        Assert.That(viewer.MyPageBgId, Is.EqualTo(0));
    }

    [Test]
    public async Task Update_with_unparseable_mypage_id_falls_back_to_zero()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var body = JsonBody("""
            {"select_type":0,"mypage_id":"garbage","mypage_id_list":[]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));

        var viewer = await LoadViewerWithRotation(factory, viewerId);
        Assert.That(viewer.MyPageBgId, Is.EqualTo(0));
    }

    [Test]
    public async Task Update_returns_envelope_with_empty_data_payload()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var body = JsonBody("""
            {"select_type":0,"mypage_id":"0","mypage_id_list":[]}
            """);
        var response = await client.PostAsync("/user_mypage/update", body);
        var raw = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), raw);

        // Test path bypasses the translation middleware (gated on UnityPlayer UA), so the
        // controller's literal return value is what comes back. An empty class serializes to "{}".
        Assert.That(raw, Is.EqualTo("{}"));
    }
}