using ScadaLink.CLI;
using ScadaLink.CLI.Commands;

namespace ScadaLink.CLI.Tests;

/// <summary>
/// Regression tests for CLI-016 — <c>WriteAsTable</c> previously derived the table
/// header set from the first array element only, so any property unique to a later
/// element was silently dropped from the rendered table.
/// </summary>
[Collection("Console")]
public class TableHeaderUnionTests
{
    [Fact]
    public void HandleResponse_TableFormat_HeterogeneousArray_IncludesAllColumns()
    {
        // The second element has a "Status" property the first lacks. The pre-fix code
        // derived headers from items[0] only, so "Status" (and its value "Faulted")
        // were dropped from the table entirely.
        var writer = new StringWriter();
        Console.SetOut(writer);

        try
        {
            var json = "[{\"Id\":1,\"Name\":\"Alpha\"},{\"Id\":2,\"Name\":\"Beta\",\"Status\":\"Faulted\"}]";
            var response = new ManagementResponse(200, json, null, null);
            var exitCode = CommandHelpers.HandleResponse(response, "table");

            Assert.Equal(0, exitCode);
            var output = writer.ToString();
            Assert.Contains("Status", output);
            Assert.Contains("Faulted", output);
        }
        finally
        {
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }

    [Fact]
    public void HandleResponse_TableFormat_HeterogeneousArray_PreservesFirstSeenColumnOrder()
    {
        // Column order must be the first-seen order across all elements: the first
        // element contributes Id, Name; the second contributes Status after them.
        var writer = new StringWriter();
        Console.SetOut(writer);

        try
        {
            var json = "[{\"Id\":1,\"Name\":\"Alpha\"},{\"Status\":\"Faulted\",\"Id\":2,\"Name\":\"Beta\"}]";
            var response = new ManagementResponse(200, json, null, null);
            var exitCode = CommandHelpers.HandleResponse(response, "table");

            Assert.Equal(0, exitCode);
            var output = writer.ToString();
            var headerLine = output.Split('\n')[0];
            Assert.True(headerLine.IndexOf("Id") < headerLine.IndexOf("Name"));
            Assert.True(headerLine.IndexOf("Name") < headerLine.IndexOf("Status"));
        }
        finally
        {
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }

    [Fact]
    public void HandleResponse_TableFormat_FirstElementHasExtraColumn_StillRendersAllRows()
    {
        // The reverse case: the first element has a property a later element lacks.
        // The later row must still render (with an empty cell), and all columns kept.
        var writer = new StringWriter();
        Console.SetOut(writer);

        try
        {
            var json = "[{\"Id\":1,\"Name\":\"Alpha\",\"Note\":\"first\"},{\"Id\":2,\"Name\":\"Beta\"}]";
            var response = new ManagementResponse(200, json, null, null);
            var exitCode = CommandHelpers.HandleResponse(response, "table");

            Assert.Equal(0, exitCode);
            var output = writer.ToString();
            Assert.Contains("Note", output);
            Assert.Contains("first", output);
            Assert.Contains("Beta", output);
        }
        finally
        {
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}