using System.Linq;
using System.Threading.Tasks;
using Opc.Ua;
using Shouldly;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Host.Domain;
using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;

namespace ZB.MOM.WW.LmxOpcUa.Tests.Integration
{
    /// <summary>
    /// Verifies OPC UA indexed array writes against the bridge's whole-array runtime update behavior.
    /// </summary>
    public class ArrayWriteTests
    {
        /// <summary>
        /// Confirms that writing a single array element updates the correct slot while preserving the rest of the array.
        /// </summary>
        [Fact]
        public async Task Write_SingleArrayElement_UpdatesWholeArrayValue()
        {
            var fixture = OpcUaServerFixture.WithFakeMxAccessClient();
            fixture.MxAccessClient!.TagValues["MESReceiver_001.MoveInPartNumbers[]"] = Vtq.Good(
                Enumerable.Range(0, 50).Select(i => $"PART-{i:00}").ToArray());

            await fixture.InitializeAsync();
            try
            {
                using var client = new OpcUaTestClient();
                await client.ConnectAsync(fixture.EndpointUrl);

                // Browse path: TestMachine_001 -> MESReceiver -> MoveInPartNumbers
                var nodeId = client.MakeNodeId("MESReceiver_001.MoveInPartNumbers[]");

                var before = client.Read(nodeId).Value as string[];
                before.ShouldNotBeNull();
                before.Length.ShouldBe(50);
                before[1].ShouldBe("PART-01");

                var status = client.Write(nodeId, new[] { "UPDATED-PART" }, indexRange: "1");
                StatusCode.IsGood(status).ShouldBe(true);

                var after = client.Read(nodeId).Value as string[];
                after.ShouldNotBeNull();
                after.Length.ShouldBe(50);
                after[0].ShouldBe("PART-00");
                after[1].ShouldBe("UPDATED-PART");
                after[2].ShouldBe("PART-02");
            }
            finally
            {
                await fixture.DisposeAsync();
            }
        }
    }
}