using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using System.Text.RegularExpressions;
using HrynCo.NotificationService.DAL.Abstract.Repositories;
using Microsoft.AspNetCore.TestHost;
using Microsoft.Extensions.DependencyInjection;

namespace HrynCo.NotificationService.Web.IntegrationTests;

public sealed class AdminDeletionTests(TemplateDatabaseFixture fixture) : IClassFixture<TemplateDatabaseFixture>
{
    [Fact]
    public async Task DefinitionDeleteRequiresAntiforgeryAndConfirmation_AndPreservesFilter()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        using var client = context.App.CreateClient(new() { AllowAutoRedirect = false });
        await context.UpsertAsync(DefinitionApiTestContext.Body(null, "en", "uk"));
        var definition = await context.ReadAsync();
        var url = $"/admin/services/{context.ServiceId}/templates/{definition.GetProperty("id").GetGuid()}/delete";
        var html = await client.GetStringAsync(url + "?keyFilter=Welcome");
        Assert.Contains("2 translation(s)", html);
        Assert.Contains("Languages: en, uk", html);
        var fields = TemplateEditorTestFields.Read(html);
        Assert.Equal(HttpStatusCode.BadRequest, (await client.PostAsync(url, new FormUrlEncodedContent(new Dictionary<string, string> { ["ConfirmDelete"] = "true" }))).StatusCode);
        var unconfirmed = await (await client.PostAsync(url, new FormUrlEncodedContent(fields))).Content.ReadAsStringAsync();
        Assert.Contains("Confirm deletion", unconfirmed);
        AssertConfirmationReset(unconfirmed);
        fields = TemplateEditorTestFields.Read(unconfirmed);
        fields["ConfirmDelete"] = "true";
        fields["Key"] = "Different";
        var deleted = await client.PostAsync(url, new FormUrlEncodedContent(fields));
        Assert.Equal(HttpStatusCode.Redirect, deleted.StatusCode);
        Assert.Equal($"/admin/services/{context.ServiceId}?key=Welcome", deleted.Headers.Location!.OriginalString);
        Assert.Equal(HttpStatusCode.NotFound, (await client.GetAsync(url)).StatusCode);
        Assert.Equal(HttpStatusCode.OK, (await client.GetAsync($"/admin/services/{context.ServiceId}")).StatusCode);
    }

    [Fact]
    public async Task StaleDefinitionConfirmationRefreshesCountRevisionAndUncheckedConfirmation()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        await context.UpsertAsync(DefinitionApiTestContext.Body(null));
        var definition = await context.ReadAsync();
        var url = $"/admin/services/{context.ServiceId}/templates/{definition.GetProperty("id").GetGuid()}/delete";
        var fields = TemplateEditorTestFields.Read(await context.Client.GetStringAsync(url));
        var oldRevision = fields["Revision"];
        await context.UpsertAsync(DefinitionApiTestContext.Body(definition.GetProperty("revision").GetGuid(), "en"));
        fields["ConfirmDelete"] = "true";
        var html = await (await context.Client.PostAsync(url, new FormUrlEncodedContent(fields))).Content.ReadAsStringAsync();
        Assert.Contains("revision changed", html);
        Assert.Contains("1 translation(s)", html);
        Assert.NotEqual(oldRevision, TemplateEditorTestFields.Read(html)["Revision"]);
        AssertConfirmationReset(html);
        Assert.Single((await context.ReadAsync()).GetProperty("translations").EnumerateArray());
        var wrongScope = $"/admin/services/{Guid.NewGuid()}/templates/{definition.GetProperty("id").GetGuid()}/delete";
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.GetAsync(wrongScope)).StatusCode);
        Assert.Equal(HttpStatusCode.NotFound, (await context.Client.PostAsync(wrongScope, new FormUrlEncodedContent(fields))).StatusCode);
    }

    [Fact]
    public async Task ServiceDeleteIsBlockedByEmptyDefinition_AndRequiresFreshConfirmationAfterRename()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        using var client = context.App.CreateClient(new() { AllowAutoRedirect = false });
        await context.UpsertAsync(DefinitionApiTestContext.Body(null));
        var url = $"/admin/services/{context.ServiceId}/delete";
        var blocked = await client.GetStringAsync(url);
        Assert.Contains("1 template definition(s)", blocked);
        Assert.Contains("Channels are never deleted automatically", blocked);
        var fields = TemplateEditorTestFields.Read(blocked);
        fields["ConfirmDelete"] = "true";
        Assert.Contains("Remove every template definition", await (await client.PostAsync(url, new FormUrlEncodedContent(fields))).Content.ReadAsStringAsync());
        var definition = await context.ReadAsync();
        await client.DeleteAsync(context.DefinitionUrl() + "&revision=" + definition.GetProperty("revision").GetGuid());
        fields = TemplateEditorTestFields.Read(await client.GetStringAsync(url));
        var oldRevision = fields["Revision"];
        using (var scope = context.App.Services.CreateScope())
        {
            var services = scope.ServiceProvider.GetRequiredService<INotificationServiceRepository>();
            var service = (await services.GetAsync(context.ServiceId))!;
            service.Name = "Renamed Before Delete";
            await services.SaveAsync(service, false);
        }
        fields["ConfirmDelete"] = "true";
        var stale = await (await client.PostAsync(url, new FormUrlEncodedContent(fields))).Content.ReadAsStringAsync();
        Assert.Contains("revision changed", stale);
        Assert.Contains("Renamed Before Delete", stale);
        Assert.NotEqual(oldRevision, TemplateEditorTestFields.Read(stale)["Revision"]);
        AssertConfirmationReset(stale);
        fields = TemplateEditorTestFields.Read(stale);
        Assert.Contains("Confirm deletion", await (await client.PostAsync(url, new FormUrlEncodedContent(fields))).Content.ReadAsStringAsync());
        fields["ConfirmDelete"] = "true";
        var deleted = await client.PostAsync(url, new FormUrlEncodedContent(fields));
        Assert.Equal(HttpStatusCode.Redirect, deleted.StatusCode);
        Assert.Equal("/admin/services", deleted.Headers.Location!.OriginalString);
    }

    [Fact]
    public async Task EmptyStatesOfferScopedFirstCreateOrClearFilterActions()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        var root = $"/admin/services/{context.ServiceId}";
        var templates = await context.Client.GetStringAsync(root);
        Assert.Contains("No templates for this service yet.", templates);
        Assert.Contains("Create First Template", templates);
        Assert.Contains(root + "/templates/create", templates);
        Assert.Contains("template-key-filter", templates);
        var filtered = await context.Client.GetStringAsync(root + "?key=Missing");
        Assert.Contains("No templates match this key.", filtered);
        Assert.Contains(">Clear filter</a>", filtered);
        Assert.DoesNotContain("Create First Template", filtered);
        var service = (await context.Client.GetFromJsonAsync<JsonElement>(context.ServiceRoot)).GetProperty("data");
        await context.Client.DeleteAsync(context.ServiceRoot + "?revision=" + service.GetProperty("revision").GetGuid());
        var services = await context.Client.GetStringAsync("/admin/services");
        Assert.Contains("No services yet.", services);
        Assert.Contains("Create First Service", services);
        Assert.Contains("aria-hidden=\"true\"", services);
    }

    [Fact]
    public async Task TemplateLoadFailureDoesNotPretendTheServiceHasNoTemplates()
    {
        await using var context = await DefinitionApiTestContext.CreateAsync(fixture);
        using var failing = context.App.WithWebHostBuilder(builder => builder.ConfigureTestServices(services =>
            services.AddScoped<IEmailTemplateDefinitionRepository, UnavailableEmailTemplateDefinitionRepository>()));
        using var client = failing.CreateClient();
        var html = await client.GetStringAsync($"/admin/services/{context.ServiceId}");
        Assert.Contains("Could not load templates", html);
        Assert.Contains("Templates are unavailable", html);
        Assert.DoesNotContain("Create First Template", html);
        Assert.DoesNotContain("No templates for this service yet.", html);
    }

    private static void AssertConfirmationReset(string html) =>
        Assert.DoesNotContain("checked", Regex.Match(html, "<input[^>]+type=\"checkbox\"[^>]*>").Value);
}