using System.IO;
using System.Text.Json;
using CliFx.Exceptions;
using CliFx.Infrastructure;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.S7.Cli.Commands;

namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Cli.Tests;

/// <summary>
///     Coverage for the <c>import-symbols</c> CLI command. The command is intentionally
///     thin (open file, hand to <c>TiaCsvImporter</c> / <c>AwlImporter</c>, serialise) —
///     these tests focus on the I/O + flag-handling shape rather than re-running the
///     parser.
/// </summary>
[Trait("Category", "Unit")]
public sealed class ImportSymbolsCommandTests
{
    private const string CanonicalTiaCsv = """
        Name,Path,Data type,Logical address,Comment,Hmi accessible
        MotorSpeed,Default,Int,%MW0,Motor speed,True
        TankLevel,Default,Real,%MD4,Tank level,True
        RunFlag,Default,Bool,%M0.0,Run flag,True
        """;

    private const string CanonicalAwl = """
        VAR_GLOBAL
          Speed : INT;
          Pressure : REAL;
        END_VAR
        """;

    [Fact]
    public async Task Execute_with_tia_csv_emits_json_fragment_with_three_tags()
    {
        var path = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, CanonicalTiaCsv);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = path,
                Format = "tia",
                Emit = "appsettings-fragment",
            };

            await cmd.ExecuteAsync(console);

            var output = console.ReadOutputString();
            output.ShouldContain("\"Tags\"");

            using var doc = JsonDocument.Parse(output);
            var tags = doc.RootElement.GetProperty("Tags");
            tags.GetArrayLength().ShouldBe(3);
            tags[0].GetProperty("Name").GetString().ShouldBe("MotorSpeed");
            tags[0].GetProperty("Address").GetString().ShouldBe("MW0");
            tags[0].GetProperty("DataType").GetString().ShouldBe("Int16");
            tags[2].GetProperty("DataType").GetString().ShouldBe("Bool");
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public async Task Execute_with_summary_emit_prints_counters()
    {
        var path = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, CanonicalTiaCsv);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = path,
                Format = "tia",
                Emit = "summary",
            };

            await cmd.ExecuteAsync(console);

            var output = console.ReadOutputString();
            output.ShouldContain("Imported 3");
            output.ShouldContain("udt-placeholders 0");
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public async Task Execute_with_awl_format_emits_var_global_tags()
    {
        var path = Path.Combine(Path.GetTempPath(), $"s7-awl-{Guid.NewGuid():N}.awl");
        File.WriteAllText(path, CanonicalAwl);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = path,
                Format = "awl",
                Emit = "appsettings-fragment",
            };

            await cmd.ExecuteAsync(console);

            var output = console.ReadOutputString();
            using var doc = JsonDocument.Parse(output);
            var tags = doc.RootElement.GetProperty("Tags");
            tags.GetArrayLength().ShouldBe(2);
            tags[0].GetProperty("Address").GetString().ShouldBe("MW0");
            tags[1].GetProperty("Address").GetString().ShouldBe("MD2");
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public async Task Execute_with_output_path_writes_file_and_prints_summary()
    {
        var inputPath = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.csv");
        var outputPath = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.json");
        File.WriteAllText(inputPath, CanonicalTiaCsv);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = inputPath,
                Format = "tia",
                Emit = "appsettings-fragment",
                Output = outputPath,
            };

            await cmd.ExecuteAsync(console);

            File.Exists(outputPath).ShouldBeTrue();
            var fileBody = File.ReadAllText(outputPath);
            using var doc = JsonDocument.Parse(fileBody);
            doc.RootElement.GetProperty("Tags").GetArrayLength().ShouldBe(3);

            console.ReadOutputString().ShouldContain("Wrote 3");
        }
        finally
        {
            try { File.Delete(inputPath); } catch { /* best-effort */ }
            try { File.Delete(outputPath); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public async Task Execute_with_missing_file_throws_command_exception()
    {
        var missing = Path.Combine(Path.GetTempPath(), $"does-not-exist-{Guid.NewGuid():N}.csv");
        using var console = new FakeInMemoryConsole();
        var cmd = new ImportSymbolsCommand
        {
            File = missing,
        };

        var ex = await Should.ThrowAsync<CommandException>(async () => await cmd.ExecuteAsync(console));
        ex.ExitCode.ShouldBe(1);
    }

    [Fact]
    public async Task Execute_with_unknown_format_throws_command_exception()
    {
        var path = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, CanonicalTiaCsv);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = path,
                Format = "yaml",
            };

            var ex = await Should.ThrowAsync<CommandException>(async () => await cmd.ExecuteAsync(console));
            ex.ExitCode.ShouldBe(2);
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public async Task Execute_with_unknown_emit_throws_command_exception()
    {
        var path = Path.Combine(Path.GetTempPath(), $"s7-tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, CanonicalTiaCsv);
        try
        {
            using var console = new FakeInMemoryConsole();
            var cmd = new ImportSymbolsCommand
            {
                File = path,
                Format = "tia",
                Emit = "xml",
            };

            var ex = await Should.ThrowAsync<CommandException>(async () => await cmd.ExecuteAsync(console));
            ex.ExitCode.ShouldBe(2);
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }
}