using System.Collections.Generic;
using System.Threading.Tasks;
using CliFx.Tests.Utils;
using CliFx.Tests.Utils.Extensions;
using FluentAssertions;
using Xunit;
using Xunit.Abstractions;

namespace CliFx.Tests;

public class ConversionSpecs(ITestOutputHelper testOutput) : SpecsBase(testOutput)
{
    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_string_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public string? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "xyz"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("xyz");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_an_object_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public object? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "xyz"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("xyz");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_boolean_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public bool Foo { get; init; }

                [CommandOption('b')]
                public bool Bar { get; init; }

                [CommandOption('c')]
                public bool Baz { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine("Foo = " + Foo);
                    console.WriteLine("Bar = " + Bar);
                    console.WriteLine("Baz = " + Baz);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "true", "-b", "false", "-c"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("Foo = True", "Bar = False", "Baz = True");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_an_integer_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public int Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "32"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("32");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_double_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public double Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo.ToString(CultureInfo.InvariantCulture));
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "32.14"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("32.14");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_DateTimeOffset_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public DateTimeOffset Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo.ToString("u", CultureInfo.InvariantCulture));
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "1995-04-28Z"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("1995-04-28 00:00:00Z");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_TimeSpan_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public TimeSpan Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo.ToString(null, CultureInfo.InvariantCulture));
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "12:34:56"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("12:34:56");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_an_enum_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public enum CustomEnum { One = 1, Two = 2, Three = 3 }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomEnum Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine((int) Foo);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "two"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("2");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_nullable_integer_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public int? Foo { get; init; }

                [CommandOption('b')]
                public int? Bar { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine("Foo = " + Foo);
                    console.WriteLine("Bar = " + Bar);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-b", "123"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("Foo = ", "Bar = 123");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_nullable_enum_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public enum CustomEnum { One = 1, Two = 2, Three = 3 }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomEnum? Foo { get; init; }

                [CommandOption('b')]
                public CustomEnum? Bar { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine("Foo = " + (int?) Foo);
                    console.WriteLine("Bar = " + (int?) Bar);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-b", "two"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("Foo = ", "Bar = 2");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_string_constructable_object_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomType
            {
                public string Value { get; }

                public CustomType(string value) => Value = value;
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomType? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo.Value);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "xyz"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("xyz");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_string_parsable_object_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomTypeA
            {
                public string Value { get; }

                private CustomTypeA(string value) => Value = value;

                public static CustomTypeA Parse(string value) =>
                    new CustomTypeA(value);
            }

            public class CustomTypeB
            {
                public string Value { get; }

                private CustomTypeB(string value) => Value = value;

                public static CustomTypeB Parse(string value, IFormatProvider formatProvider) =>
                    new CustomTypeB(value);
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomTypeA? Foo { get; init; }

                [CommandOption('b')]
                public CustomTypeB? Bar { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine("Foo = " + Foo.Value);
                    console.WriteLine("Bar = " + Bar.Value);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "hello", "-b", "world"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("Foo = hello", "Bar = world");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_property_with_a_custom_converter()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomConverter : BindingConverter<int>
            {
                public override int Convert(string rawValue) =>
                    rawValue.Length;
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f', Converter = typeof(CustomConverter))]
                public int Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    console.WriteLine(Foo);
                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "hello world"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Trim().Should().Be("11");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_string_array_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public string[]? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    foreach (var i in Foo)
                        console.WriteLine(i);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "one", "two", "three"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("one", "two", "three");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_read_only_list_of_strings_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public IReadOnlyList<string>? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    foreach (var i in Foo)
                        console.WriteLine(i);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "one", "two", "three"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("one", "two", "three");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_a_string_list_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public List<string>? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    foreach (var i in Foo)
                        console.WriteLine(i);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "one", "two", "three"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("one", "two", "three");
    }

    [Fact]
    public async Task I_can_bind_a_parameter_or_an_option_to_an_integer_array_property()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public int[]? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console)
                {
                    foreach (var i in Foo)
                        console.WriteLine(i);

                    return default;
                }
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "1", "13", "27"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().Be(0);

        var stdOut = FakeConsole.ReadOutputString();
        stdOut.Should().ConsistOfLines("1", "13", "27");
    }

    [Fact]
    public async Task I_can_try_to_bind_a_parameter_or_an_option_to_a_property_and_get_an_error_if_it_is_of_an_unsupported_type()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomType
            {
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomType? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console) => default;
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "xyz"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().NotBe(0);

        var stdErr = FakeConsole.ReadErrorString();
        stdErr.Should().Contain("has an unsupported underlying property type");
    }

    [Fact]
    public async Task I_can_try_to_bind_a_parameter_or_an_option_to_a_non_scalar_property_and_get_an_error_if_it_is_of_an_unsupported_type()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomType : IEnumerable<object>
            {
                public IEnumerator<object> GetEnumerator() => Enumerable.Empty<object>().GetEnumerator();

                IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomType? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console) => default;
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "one", "two"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().NotBe(0);

        var stdErr = FakeConsole.ReadErrorString();
        stdErr.Should().Contain("has an unsupported underlying property type");
    }

    [Fact]
    public async Task I_can_try_to_bind_a_parameter_or_an_option_to_a_property_and_get_an_error_if_the_user_provides_an_invalid_value()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public int Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console) => default;
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(
            ["-f", "12.34"],
            new Dictionary<string, string>()
        );

        // Assert
        exitCode.Should().NotBe(0);

        var stdErr = FakeConsole.ReadErrorString();
        stdErr.Should().NotBeNullOrWhiteSpace();
    }

    [Fact]
    public async Task I_can_try_to_bind_a_parameter_or_an_option_to_a_property_and_get_an_error_if_a_custom_validator_fails()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class ValidatorA : BindingValidator<int>
            {
                public override BindingValidationError Validate(int value) => Ok();
            }

            public class ValidatorB : BindingValidator<int>
            {
                public override BindingValidationError Validate(int value) => Error("Hello world");
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f', Validators = [typeof(ValidatorA), typeof(ValidatorB)])]
                public int Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console) => default;
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "12"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().NotBe(0);

        var stdErr = FakeConsole.ReadErrorString();
        stdErr.Should().Contain("Hello world");
    }

    [Fact]
    public async Task I_can_try_to_bind_a_parameter_or_an_option_to_a_string_parsable_property_and_get_an_error_if_the_parsing_fails()
    {
        // Arrange
        var commandType = DynamicCommandBuilder.Compile(
            // lang=csharp
            """
            public class CustomType
            {
                public string Value { get; }

                private CustomType(string value) => Value = value;

                public static CustomType Parse(string value) => throw new Exception("Hello world");
            }

            [Command]
            public class Command : ICommand
            {
                [CommandOption('f')]
                public CustomType? Foo { get; init; }

                public ValueTask ExecuteAsync(IConsole console) => default;
            }
            """
        );

        var application = new CliApplicationBuilder()
            .AddCommand(commandType)
            .UseConsole(FakeConsole)
            .Build();

        // Act
        var exitCode = await application.RunAsync(["-f", "bar"], new Dictionary<string, string>());

        // Assert
        exitCode.Should().NotBe(0);

        var stdErr = FakeConsole.ReadErrorString();
        stdErr.Should().Contain("Hello world");
    }
}