using System.Text.Json;
using HrynCo.NotificationService.Contracts.Messages;
using HrynCo.NotificationService.DAL.Abstract.Templates;
using HrynCo.NotificationService.Worker.Services.Push;

namespace HrynCo.NotificationService.Services.Tests.Push;

public sealed class PushTemplateRendererTests
{
    [Fact]
    public void RendersLocalizedLabelsAndOpaqueObjectIdsWithoutReinterpretingValues()
    {
        var result = PushTemplateRenderer.Render(Template(), Message());
        Assert.Equal("Hello {{Injected}}", result.Title);
        var button = Assert.Single(result.Buttons);
        Assert.Equal("View {{Injected}}", button.Label);
        Assert.Equal("need-42", button.ObjectId);
        Assert.Equal("open", result.DefaultAction!.Action);
        using var payload = JsonDocument.Parse(FirebasePushClient.BuildPayload(Guid.NewGuid(), result)["actions"]);
        Assert.Equal("need-42", payload.RootElement.GetProperty("buttons")[0].GetProperty("objectId").GetString());
        Assert.Equal("open", payload.RootElement.GetProperty("defaultAction").GetProperty("action").GetString());
    }

    [Fact]
    public void UsesEnglishFallbackAndRejectsMissingFallback()
    {
        var message = Message() with { LanguageCode = "uk" };
        Assert.Equal("Hello {{Injected}}", PushTemplateRenderer.Render(Template(), message).Title);
        var template = Template();
        template.Languages = [];
        Assert.Throws<EmailTemplateWriteException>(() => PushTemplateRenderer.Render(template, message));
    }

    [Fact]
    public void MissingBindingOrConfiguredActionFailsInsteadOfSendingIncompleteNotification()
    {
        var message = Message();
        Assert.Throws<EmailTemplateWriteException>(() => PushTemplateRenderer.Render(Template(), message with
        {
            TemplateData = message.TemplateData! with { Bindings = new Dictionary<string, string>() }
        }));
        Assert.Throws<EmailTemplateWriteException>(() => PushTemplateRenderer.Render(Template(), message with
        {
            TemplateData = message.TemplateData! with { Actions = new Dictionary<string, PushActionMetadata>() }
        }));
    }

    [Fact]
    public void TruncationKeepsUnicodeTextElementsIntact()
    {
        var message = Message() with
        {
            TemplateData = Message().TemplateData! with { Bindings = new Dictionary<string, string> { ["Name"] = string.Concat(Enumerable.Repeat("😀", 100)) } }
        };
        var result = PushTemplateRenderer.Render(Template(), message);
        Assert.True(result.Title.Length <= 100);
        Assert.EndsWith("…", result.Title);
        Assert.False(char.IsHighSurrogate(result.Title[^2]));
    }

    [Theory]
    [InlineData("{\"buttons\":null}")]
    [InlineData("{\"buttons\":[{\"action\":\"open\",\"label\":\"\"}]}")]
    [InlineData("{\"buttons\":[{\"action\":\"open\",\"label\":\"Open\"},{\"action\":\"open\",\"label\":\"Again\"}]}")]
    [InlineData("{\"defaultAction\":\"https://example.invalid\"}")]
    [InlineData("{\"unknown\":true}")]
    public void RejectsInvalidActionDefinitions(string json) =>
        Assert.Throws<EmailTemplateWriteException>(() => PushTemplateActionValidation.Parse(json));

    private static PushTemplateDefinition Template() => new()
    {
        Key = "Shared", Variables = [new EmailTemplateVariable { Name = "Name", Required = true }],
        Languages = [new PushTemplateTranslation
        {
            LanguageCode = "en", Title = "Hello {{Name}}", Body = "Shared item",
            ActionsJson = "{\"defaultAction\":\"open\",\"buttons\":[{\"action\":\"open\",\"label\":\"View {{Name}}\"}]}"
        }]
    };

    private static SendPushMessageData Message() => new()
    {
        RegistrationId = Guid.NewGuid(), BindingId = Guid.NewGuid(), UserId = Guid.NewGuid(),
        ServiceName = "Example", Version = 2, TemplateKey = "Shared", LanguageCode = "en", ExpiresAt = DateTimeOffset.UtcNow.AddMinutes(5),
        TemplateData = new PushTemplateData
        {
            Bindings = new Dictionary<string, string> { ["Name"] = "{{Injected}}" },
            Actions = new Dictionary<string, PushActionMetadata> { ["open"] = new() { ObjectId = "need-42" } }
        }
    };
}