using System.Net;
using System.Net.Http.Json;
using System.Text.Json;

namespace HSchool.AppHost.Tests;

[Collection(AppHostCollection.Name)]
public class PortraitApiTests(AppHostFixture fixture)
{
    private static readonly DateTime Start = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);

    [Fact]
    public async Task GetPortrait_WithoutFile_Returns404()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Портреты", Start);
        var personId = await FirstPersonIdAsync(client, school.Id);

        using var response = await client.GetAsync(
            $"/api/schools/{school.Id}/people/{Uri.EscapeDataString(personId)}/portrait?kind=avatar",
            TestContext.Current.CancellationToken);

        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
        Assert.Equal("portrait-missing", await SchoolApiTests.ProblemCodeAsync(response));
    }

    [Fact]
    public async Task GetPortrait_WithFile_ReturnsPngAndCardFlags()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Портрет на диске", Start);
        var personId = await FirstPersonIdAsync(client, school.Id);
        var directory = await SavesDirectoryAsync(client);
        var portraits = Path.Combine(directory, $"{school.Id}.portraits");
        Directory.CreateDirectory(portraits);
        var png = Convert.FromBase64String("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==");
        await File.WriteAllBytesAsync(Path.Combine(portraits, $"{personId}.avatar.png"), png, TestContext.Current.CancellationToken);

        using var image = await client.GetAsync(
            $"/api/schools/{school.Id}/people/{Uri.EscapeDataString(personId)}/portrait?kind=avatar",
            TestContext.Current.CancellationToken);
        Assert.Equal(HttpStatusCode.OK, image.StatusCode);
        Assert.Equal("image/png", image.Content.Headers.ContentType?.MediaType);

        var card = await client.GetFromJsonAsync<PersonCardResponse>(
            $"/api/schools/{school.Id}/people/{Uri.EscapeDataString(personId)}?lang=ru",
            TestContext.Current.CancellationToken);
        Assert.NotNull(card);
        Assert.True(card!.HasAvatar);
        Assert.False(card.HasFullBody);
    }

    [Fact]
    public async Task PostPortrait_WhenSwarmNotConfigured_Returns503()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Swarm выкл", Start);
        var personId = await FirstPersonIdAsync(client, school.Id);

        using var response = await client.PostAsync(
            $"/api/schools/{school.Id}/people/{Uri.EscapeDataString(personId)}/portrait?kind=avatar",
            null,
            TestContext.Current.CancellationToken);

        Assert.Equal(HttpStatusCode.ServiceUnavailable, response.StatusCode);
        Assert.Equal("swarmui-not-configured", await SchoolApiTests.ProblemCodeAsync(response));
    }

    [Fact]
    public async Task GetPortraitPrompt_ReturnsBuiltPositiveAndNegative()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Промпт", Start);
        var personId = await FirstPersonIdAsync(client, school.Id);

        using var response = await client.GetAsync(
            $"/api/schools/{school.Id}/people/{Uri.EscapeDataString(personId)}/portrait/prompt?kind=avatar",
            TestContext.Current.CancellationToken);

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var payload = await response.Content.ReadFromJsonAsync<PortraitPromptPayload>(TestContext.Current.CancellationToken);
        Assert.NotNull(payload);
        Assert.Equal("avatar", payload!.Kind);
        Assert.Contains("age", payload.Positive, StringComparison.OrdinalIgnoreCase);
        Assert.False(string.IsNullOrWhiteSpace(payload.Negative));
        Assert.False(string.IsNullOrWhiteSpace(payload.PresetId));
    }

    [Fact]
    public async Task GetSwarmUiSettings_ReturnsPresets()
    {
        using var client = fixture.App.CreateHttpClient("server");

        await SchoolApiTests.LoginAsync(client);

        var settings = await client.GetFromJsonAsync<SwarmUiSettingsPayload>(
            "/api/settings/swarmui",
            TestContext.Current.CancellationToken);
        Assert.NotNull(settings);
        Assert.NotEmpty(settings!.Presets);
        Assert.NotEmpty(settings.Models);
        Assert.False(string.IsNullOrWhiteSpace(settings.ActivePresetId));
    }

    [Fact]
    public async Task CreateSchool_CopiesPortraitSettingsIntoTheSave()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Пресеты школы", Start);
        var directory = await SavesDirectoryAsync(client);
        var json = await File.ReadAllTextAsync(
            Path.Combine(directory, $"{school.Id}.json"),
            TestContext.Current.CancellationToken);
        using var document = JsonDocument.Parse(json);
        Assert.True(document.RootElement.TryGetProperty("portraitSettings", out var presets));
        Assert.True(presets.TryGetProperty("presets", out var list));
        Assert.True(list.GetArrayLength() > 0);
        Assert.True(presets.TryGetProperty("models", out var models));
        Assert.True(models.GetArrayLength() > 0);
    }

    [Fact]
    public async Task CreateSchool_RejectsEmptyPortraitPresets()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        using var response = await client.PostAsJsonAsync(
            "/api/schools",
            new
            {
                name = "Плохие пресеты",
                startDate = Start,
                portraitSettings = new { activePresetId = "missing", presets = Array.Empty<object>(), ageRules = Array.Empty<object>() },
            },
            TestContext.Current.CancellationToken);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        Assert.Equal("invalid-portrait-settings", await SchoolApiTests.ProblemCodeAsync(response));
    }

    [Fact]
    public async Task DeleteSchool_RemovesPortraitDirectory()
    {
        using var client = fixture.App.CreateHttpClient("server");
        await SchoolApiTests.ResetAsync(client);
        var school = await SchoolApiTests.CreateAsync(client, "Удалить портреты", Start);
        var personId = await FirstPersonIdAsync(client, school.Id);
        var directory = await SavesDirectoryAsync(client);
        var portraits = Path.Combine(directory, $"{school.Id}.portraits");
        Directory.CreateDirectory(portraits);
        await File.WriteAllBytesAsync(Path.Combine(portraits, $"{personId}.avatar.png"), [1, 2, 3], TestContext.Current.CancellationToken);

        using var deleted = await client.DeleteAsync($"/api/schools/{school.Id}", TestContext.Current.CancellationToken);
        Assert.Equal(HttpStatusCode.NoContent, deleted.StatusCode);
        Assert.False(Directory.Exists(portraits));
    }

    private static async Task<string> FirstPersonIdAsync(HttpClient client, int schoolId)
    {
        var page = await client.GetFromJsonAsync<PeopleListResponse>(
            $"/api/schools/{schoolId}/people?pageSize=1",
            TestContext.Current.CancellationToken);
        Assert.NotNull(page);
        Assert.NotEmpty(page!.People);
        return page.People[0].Id;
    }

    private static async Task<string> SavesDirectoryAsync(HttpClient client)
    {
        var payload = await client.GetFromJsonAsync<SavesDirectoryResponse>(
            "/api/dev/saves-directory",
            TestContext.Current.CancellationToken);
        return payload!.Path;
    }

    private sealed record PeopleListResponse(int Total, IReadOnlyList<PersonListItem> People);

    private sealed record PersonListItem(string Id);

    private sealed record PersonCardResponse(
        string Id,
        bool HasAvatar,
        bool HasCustom,
        bool HasFullBody,
        string? CustomPortraitPrompt);

    private sealed record PortraitPromptPayload(
        string Kind,
        string Positive,
        string Negative,
        string? PromptExtra,
        string PresetId,
        string PresetLabel);

    private sealed record SwarmUiSettingsPayload(
        string ActivePresetId,
        IReadOnlyList<SwarmUiPresetPayload> Presets,
        IReadOnlyList<SwarmUiModelPayload> Models);

    private sealed record SwarmUiPresetPayload(string Id, string Label);

    private sealed record SwarmUiModelPayload(string Id);

    private sealed record SavesDirectoryResponse(string Path);
}