using System.Text.Json;
using VolcanicCore.Api.Engine;

namespace VolcanicCore.Tests;

public class WorkflowGraphParseTests
{
    [Fact]
    public void Nodes_without_pin_fields_get_null_pins()
    {
        var g = WorkflowGraph.Parse("""
            {
              "nodes": [{ "id": "n1", "type_id": "test.a", "config": {} }],
              "edges": []
            }
        """);
        var n = g.Nodes.Single();
        Assert.Null(n.PinnedInputJson);
        Assert.Null(n.PinnedOutputJson);
    }

    [Fact]
    public void Pinned_input_object_is_stored_as_raw_json_text()
    {
        var g = WorkflowGraph.Parse("""
            {
              "nodes": [{
                "id": "n1", "type_id": "test.a", "config": {},
                "pinned_input": { "a": 1 }
              }],
              "edges": []
            }
        """);
        Assert.Equal("""{"a":1}""",
            Compact(g.Nodes.Single().PinnedInputJson!));
    }

    [Fact]
    public void Pinned_output_array_is_stored_as_raw_json_text()
    {
        var g = WorkflowGraph.Parse("""
            {
              "nodes": [{
                "id": "t", "type_id": "test.trigger", "config": {},
                "pinned_output": [{ "b": 1 }, { "b": 2 }]
              }],
              "edges": []
            }
        """);
        Assert.Equal("""[{"b":1},{"b":2}]""",
            Compact(g.Nodes.Single().PinnedOutputJson!));
    }

    [Fact]
    public void Explicit_null_pin_is_stored_as_null()
    {
        var g = WorkflowGraph.Parse("""
            {
              "nodes": [{
                "id": "n1", "type_id": "test.a", "config": {},
                "pinned_input": null, "pinned_output": null
              }],
              "edges": []
            }
        """);
        var n = g.Nodes.Single();
        Assert.Null(n.PinnedInputJson);
        Assert.Null(n.PinnedOutputJson);
    }

    private static string Compact(string raw)
    {
        using var doc = JsonDocument.Parse(raw);
        return JsonSerializer.Serialize(doc.RootElement);
    }
}