using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using HrynCo.NotificationService.DAL.Abstract.Providers;
using HrynCo.NotificationService.DAL.Abstract.Repositories;
using HrynCo.NotificationService.DAL.Abstract.Templates;
using HrynCo.NotificationService.DAL.EF;
using Microsoft.Extensions.DependencyInjection;

namespace HrynCo.NotificationService.Web.IntegrationTests;

public sealed class ServiceDeletionApiTests(TemplateDatabaseFixture fixture) : IClassFixture<TemplateDatabaseFixture>
{
    [Fact]
    public async Task ListsExposeRevisions_AndDefinitionsAreServiceScopedIncludingEmptyDefinitions()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await context.UpsertAsync(DefinitionApiTestContext.Body(null), "Empty");
        await context.UpsertAsync(DefinitionApiTestContext.Body(null, "en"), "Populated");
        using var scope = context.App.Services.CreateScope();
        var other = new NotificationServiceInfo { Name = "OtherService" };
        await scope.ServiceProvider.GetRequiredService<INotificationServiceRepository>().SaveAsync(other, true);
        var services = (await context.Client.GetFromJsonAsync<JsonElement>("/api/v1/services/all")).GetProperty("data");
        Assert.Equal(2, services.GetArrayLength());
        Assert.All(services.EnumerateArray(), s => Assert.NotEqual(Guid.Empty, s.GetProperty("revision").GetGuid()));
        var definitions = (await context.Client.GetFromJsonAsync<JsonElement>(context.ServiceRoot + "/email-template-definitions/all")).GetProperty("data");
        Assert.Equal(new[] { "Empty", "Populated" }, definitions.EnumerateArray().Select(d => d.GetProperty("key").GetString()));
        Assert.Empty(definitions[0].GetProperty("translations").EnumerateArray());
        Assert.Single(definitions[1].GetProperty("translations").EnumerateArray());
        Assert.All(definitions.EnumerateArray(), d => Assert.Equal(context.ServiceId, d.GetProperty("serviceId").GetGuid()));
        var otherDefinitions = await context.Client.GetFromJsonAsync<JsonElement>($"/api/v1/services/{other.Id}/email-template-definitions/all");
        Assert.Empty(otherDefinitions.GetProperty("data").EnumerateArray());
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.GetAsync($"/api/v1/services/{Guid.NewGuid()}/email-template-definitions/all")).StatusCode);
    }

    [Fact]
    public async Task ExplicitCleanupDeletesDefinitionsThenServiceAndLanguages_ButRetainsChannels()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await SeedChannelAsync(context);
        const string key = "Delete / %2F Привіт";
        await context.UpsertAsync(DefinitionApiTestContext.Body(null, "en", "uk"), key);
        var definition = await context.ReadAsync(key);
        var service = await ReadServiceAsync(context);
        Assert.Equal(HttpStatusCode.Conflict, (await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid())).StatusCode);
        var deleted = await context.Client.DeleteAsync(context.DefinitionUrl(key) + "&revision=" + definition.GetProperty("revision").GetGuid());
        Assert.Equal(HttpStatusCode.OK, deleted.StatusCode);
        var result = await deleted.Content.ReadFromJsonAsync<JsonElement>();
        Assert.True(result.GetProperty("success").GetBoolean());
        Assert.Equal(JsonValueKind.Object, result.GetProperty("data").ValueKind);
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.GetAsync(context.DefinitionUrl(key))).StatusCode);
        var afterDefinitionDeletion = await ReadServiceAsync(context);
        Assert.Equal(service.GetProperty("revision").GetGuid(), afterDefinitionDeletion.GetProperty("revision").GetGuid());
        Assert.Equal(service.GetProperty("supportedLanguageCodes").GetRawText(), afterDefinitionDeletion.GetProperty("supportedLanguageCodes").GetRawText());
        Assert.All(afterDefinitionDeletion.GetProperty("languages").EnumerateArray(), l => Assert.Equal(0, l.GetProperty("versionCount").GetInt32()));
        Assert.Equal(HttpStatusCode.OK, (await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid())).StatusCode);
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.GetAsync(context.ServiceRoot)).StatusCode);
        var all = await context.Client.GetFromJsonAsync<JsonElement>("/api/v1/services/all");
        Assert.Empty(all.GetProperty("data").EnumerateArray());
        using var scope = context.App.Services.CreateScope();
        Assert.Single(await scope.ServiceProvider.GetRequiredService<IEmailChannelRepository>().GetAllAsync());
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid())).StatusCode);
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.DeleteAsync(context.DefinitionUrl(key) + "&revision=" + definition.GetProperty("revision").GetGuid())).StatusCode);
    }

    [Fact]
    public async Task DeleteIsRevisionGuarded_AndEvenEmptyDefinitionsBlockServiceRemoval()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await context.UpsertAsync(DefinitionApiTestContext.Body(null));
        var definition = await context.ReadAsync();
        var service = await ReadServiceAsync(context);
        Assert.Equal(HttpStatusCode.Conflict, (await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid())).StatusCode);
        Assert.Equal(HttpStatusCode.Conflict, (await context.Client.DeleteAsync(context.DefinitionUrl() + "&revision=" + Guid.NewGuid())).StatusCode);
        using var scope = context.App.Services.CreateScope();
        var repository = scope.ServiceProvider.GetRequiredService<INotificationServiceRepository>();
        var edit = (await repository.GetAsync(context.ServiceId))!;
        edit.Name = "RenamedService";
        await repository.SaveAsync(edit, false);
        Assert.Equal(HttpStatusCode.Conflict, (await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid())).StatusCode);
        Assert.Equal(HttpStatusCode.Conflict, (await context.Client.DeleteAsync(context.DefinitionUrl() + "&revision=" + definition.GetProperty("revision").GetGuid())).StatusCode);
        Assert.Equal("RenamedService", (await ReadServiceAsync(context)).GetProperty("name").GetString());
        Assert.Empty((await context.ReadAsync()).GetProperty("translations").EnumerateArray());
    }

    [Theory]
    [InlineData("")]
    [InlineData("?revision=not-a-guid")]
    [InlineData("?revision=00000000-0000-0000-0000-000000000000")]
    public async Task InvalidServiceDeleteDoesNotRemoveAnything(string query)
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        var before = await ReadServiceAsync(context);
        var response = await context.Client.DeleteAsync(context.ServiceRoot + query);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        Assert.Equal("InvalidRequest", (await response.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("error").GetProperty("code").GetString());
        Assert.Equal(before.GetRawText(), (await ReadServiceAsync(context)).GetRawText());
    }

    [Theory]
    [InlineData("?key=Welcome")]
    [InlineData("?key=Welcome&revision=not-a-guid")]
    [InlineData("?key=Welcome&revision=00000000-0000-0000-0000-000000000000")]
    [InlineData("?revision=11111111-1111-1111-1111-111111111111")]
    public async Task InvalidDefinitionDeleteDoesNotRemoveAnything(string query)
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await context.UpsertAsync(DefinitionApiTestContext.Body(null, "en"));
        var before = await context.ReadAsync();
        var response = await context.Client.DeleteAsync(context.ServiceRoot + "/email-template-definitions" + query);
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        Assert.Equal("InvalidRequest", (await response.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("error").GetProperty("code").GetString());
        Assert.Equal(before.GetRawText(), (await context.ReadAsync()).GetRawText());
    }

    [Fact]
    public async Task ConcurrentDefinitionUpdateAndDeleteHaveOneWinner()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await context.UpsertAsync(DefinitionApiTestContext.Body(null, "en"));
        var revision = (await context.ReadAsync()).GetProperty("revision").GetGuid();
        var responses = await Task.WhenAll(context.UpsertAsync(DefinitionApiTestContext.Body(revision, "uk")), context.Client.DeleteAsync(context.DefinitionUrl() + "&revision=" + revision));
        Assert.Equal(new[] { HttpStatusCode.OK, HttpStatusCode.Conflict }, responses.Select(r => r.StatusCode).Order().ToArray());
    }

    [Fact]
    public async Task ConcurrentServiceDeleteAndDefinitionCreationCannotLeaveOrphans()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        var service = await ReadServiceAsync(context);
        var deletion = context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid());
        var creation = context.UpsertAsync(DefinitionApiTestContext.Body(null, "en"));
        var responses = await Task.WhenAll(deletion, creation);
        var deleted = responses[0].StatusCode;
        var created = responses[1].StatusCode;
        Assert.True(deleted == HttpStatusCode.OK && created == HttpStatusCode.NotFound
            || deleted == HttpStatusCode.Conflict && created == HttpStatusCode.Created);
    }

    private static async Task<JsonElement> ReadServiceAsync(DefinitionApiTestContext context) =>
        (await context.Client.GetFromJsonAsync<JsonElement>(context.ServiceRoot)).GetProperty("data");

    private static async Task SeedChannelAsync(DefinitionApiTestContext context)
    {
        using var scope = context.App.Services.CreateScope();
        await scope.ServiceProvider.GetRequiredService<IEmailChannelRepository>().AddAsync(new EmailChannel
        {
            ServiceName = "TestService", EmailChannelType = EmailChannelType.Smtp,
            Settings = new SmtpChannelSettings { Host = "localhost", FromEmail = "test@example.invalid" }
        });
        await scope.ServiceProvider.GetRequiredService<NotificationDbContext>().SaveChangesAsync();
    }
}