using System;
using Shouldly;
using Spectre.Console.Cli;
using Spectre.Console.Tests.Data;
using Spectre.Console.Testing;
using Xunit;

namespace Spectre.Console.Tests.Unit.Cli
{
    public sealed partial class CommandAppTests
    {
        [Fact]
        public void Should_Pass_Case_1()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddBranch<MammalSettings>("mammal", mammal =>
                    {
                        mammal.AddCommand<DogCommand>("dog");
                        mammal.AddCommand<HorseCommand>("horse");
                    });
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "--alive", "mammal", "--name",
                "Rufus", "dog", "12", "--good-boy",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.Age.ShouldBe(12);
                dog.GoodBoy.ShouldBe(true);
                dog.Name.ShouldBe("Rufus");
                dog.IsAlive.ShouldBe(true);
            });
        }

        [Fact]
        public void Should_Pass_Case_2()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<DogCommand>("dog");
            });

            // When
            var result = app.Run(new[]
            {
                "dog", "12", "4", "--good-boy",
                "--name", "Rufus", "--alive",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.Legs.ShouldBe(12);
                dog.Age.ShouldBe(4);
                dog.GoodBoy.ShouldBe(true);
                dog.Name.ShouldBe("Rufus");
                dog.IsAlive.ShouldBe(true);
            });
        }

        [Fact]
        public void Should_Pass_Case_3()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                    animal.AddCommand<HorseCommand>("horse");
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "dog", "12", "--good-boy",
                "--name", "Rufus",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.Age.ShouldBe(12);
                dog.GoodBoy.ShouldBe(true);
                dog.Name.ShouldBe("Rufus");
                dog.IsAlive.ShouldBe(false);
            });
        }

        [Fact]
        public void Should_Pass_Case_4()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "4", "dog", "12", "--good-boy",
                "--name", "Rufus",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.Legs.ShouldBe(4);
                dog.Age.ShouldBe(12);
                dog.GoodBoy.ShouldBe(true);
                dog.IsAlive.ShouldBe(false);
                dog.Name.ShouldBe("Rufus");
            });
        }

        [Fact]
        public void Should_Pass_Case_5()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<OptionVectorCommand>("multi");
            });

            // When
            var result = app.Run(new[]
            {
                "multi", "--foo", "a", "--foo", "b",
                "--bar", "1", "--foo", "c", "--bar", "2",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<OptionVectorSettings>().And(vec =>
            {
                vec.Foo.Length.ShouldBe(3);
                vec.Foo.ShouldBe(new[] { "a", "b", "c" });
                vec.Bar.Length.ShouldBe(2);
                vec.Bar.ShouldBe(new[] { 1, 2 });
            });
        }

        [Fact]
        public void Should_Pass_Case_6()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<GenericCommand<ArgumentVectorSettings>>("multi");
            });

            // When
            var result = app.Run(new[]
            {
                "multi", "a", "b", "c",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<ArgumentVectorSettings>().And(vec =>
            {
                vec.Foo.Length.ShouldBe(3);
                vec.Foo.ShouldBe(new[] { "a", "b", "c" });
            });
        }

        [Fact]
        public void Should_Be_Able_To_Use_Command_Alias()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<OptionVectorCommand>("multi").WithAlias("multiple");
            });

            // When
            var result = app.Run(new[]
            {
                "multiple", "--foo", "a",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<OptionVectorSettings>().And(vec =>
            {
                vec.Foo.Length.ShouldBe(1);
                vec.Foo.ShouldBe(new[] { "a" });
            });
        }

        [Fact]
        public void Should_Assign_Default_Value_To_Optional_Argument()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<GenericCommand<OptionalArgumentWithDefaultValueSettings>>();
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            var result = app.Run(Array.Empty<string>());

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<OptionalArgumentWithDefaultValueSettings>().And(settings =>
            {
                settings.Greeting.ShouldBe("Hello World");
            });
        }

        [Fact]
        public void Should_Assign_Property_Initializer_To_Optional_Argument()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<GenericCommand<OptionalArgumentWithPropertyInitializerSettings>>();
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            var result = app.Run(Array.Empty<string>());

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings
                .ShouldBeOfType<OptionalArgumentWithPropertyInitializerSettings>()
                .And(settings => settings.Count.ShouldBe(1))
                .And(settings => settings.Value.ShouldBe(0))
                .And(settings => settings.Names.ShouldNotBeNull())
                .And(settings => settings.Names.ShouldNotBeNull())
                .And(settings => settings.Names.ShouldBeEmpty());
        }

        [Fact]
        public void Should_Overwrite_Property_Initializer_With_Argument_Value()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<GenericCommand<OptionalArgumentWithPropertyInitializerSettings>>();
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            var result = app.Run("-c", "0", "-v", "50", "ABBA", "Herreys");

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings
                .ShouldBeOfType<OptionalArgumentWithPropertyInitializerSettings>()
                .And(settings => settings.Count.ShouldBe(0))
                .And(settings => settings.Value.ShouldBe(50))
                .And(settings => settings.Names.ShouldContain("ABBA"))
                .And(settings => settings.Names.ShouldContain("Herreys"));
        }

        [Fact]
        public void Should_Assign_Default_Value_To_Optional_Argument_Using_Converter_If_Necessary()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<GenericCommand<OptionalArgumentWithDefaultValueAndTypeConverterSettings>>();
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            var result = app.Run(Array.Empty<string>());

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<OptionalArgumentWithDefaultValueAndTypeConverterSettings>().And(settings =>
            {
                settings.Greeting.ShouldBe(5);
            });
        }

        [Fact]
        public void Should_Throw_If_Required_Argument_Have_Default_Value()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<GenericCommand<RequiredArgumentWithDefaultValueSettings>>();
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            var result = Record.Exception(() => app.Run(Array.Empty<string>()));

            // Then
            result.ShouldBeOfType<CommandConfigurationException>().And(ex =>
            {
                ex.Message.ShouldBe("The required argument 'GREETING' cannot have a default value.");
            });
        }

        [Fact]
        public void Should_Throw_If_Alias_Conflicts_With_Another_Command()
        {
            // Given
            var app = new CommandApp();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<DogCommand>("dog").WithAlias("cat");
                config.AddCommand<CatCommand>("cat");
            });

            // When
            var result = Record.Exception(() => app.Run(new[] { "dog", "4", "12" }));

            // Then
            result.ShouldBeOfType<CommandConfigurationException>().And(ex =>
            {
                ex.Message.ShouldBe("The alias 'cat' for 'dog' conflicts with another command.");
            });
        }

        [Fact]
        public void Should_Register_Commands_When_Configuring_Application()
        {
            // Given
            var registrar = new FakeTypeRegistrar();
            var app = new CommandApp(registrar);
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<GenericCommand<FooCommandSettings>>("foo");
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                    animal.AddCommand<HorseCommand>("horse");
                });
            });

            // When
            app.Run(new[]
            {
                "animal", "4", "dog", "12",
            });

            // Then
            registrar.Registrations.ContainsKey(typeof(ICommand)).ShouldBeTrue();
            registrar.Registrations[typeof(ICommand)].ShouldContain(typeof(GenericCommand<FooCommandSettings>));
            registrar.Registrations[typeof(ICommand)].ShouldContain(typeof(DogCommand));
            registrar.Registrations[typeof(ICommand)].ShouldContain(typeof(HorseCommand));
        }

        [Fact]
        public void Should_Register_Default_Command_When_Configuring_Application()
        {
            // Given
            var registrar = new FakeTypeRegistrar();
            var app = new CommandApp<DogCommand>(registrar);
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            app.Run(new[]
            {
                "12", "4",
            });

            // Then
            registrar.Registrations.ContainsKey(typeof(ICommand)).ShouldBeTrue();
            registrar.Registrations[typeof(ICommand)].ShouldContain(typeof(DogCommand));
        }

        [Fact]
        public void Can_Register_Default_Command_Settings_When_Configuring_Application()
        {
            // Given
            var registrar = new FakeTypeRegistrar();
            registrar.Register(typeof(DogSettings), typeof(DogSettings));
            var app = new CommandApp<DogCommand>(registrar);
            app.Configure(config =>
            {
                config.PropagateExceptions();
            });

            // When
            app.Run(new[]
            {
                "12", "4",
            });

            // Then
            registrar.Registrations.ContainsKey(typeof(DogSettings)).ShouldBeTrue();
            registrar.Registrations[typeof(DogSettings)].Count.ShouldBe(1);
            registrar.Registrations[typeof(DogSettings)].ShouldContain(typeof(DogSettings));
        }

        [Fact]
        public void Can_Register_Command_Settings_When_Configuring_Application()
        {
            // Given
            var registrar = new FakeTypeRegistrar();
            registrar.Register(typeof(DogSettings), typeof(DogSettings));
            registrar.Register(typeof(MammalSettings), typeof(MammalSettings));
            var app = new CommandApp(registrar);
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                    animal.AddCommand<HorseCommand>("horse");
                });
            });

            // When
            app.Run(new[]
            {
                "animal", "4", "dog", "12",
            });

            // Then
            registrar.Registrations.ContainsKey(typeof(DogSettings)).ShouldBeTrue();
            registrar.Registrations[typeof(DogSettings)].Count.ShouldBe(1);
            registrar.Registrations[typeof(DogSettings)].ShouldContain(typeof(DogSettings));
            registrar.Registrations.ContainsKey(typeof(MammalSettings)).ShouldBeTrue();
            registrar.Registrations[typeof(MammalSettings)].Count.ShouldBe(1);
            registrar.Registrations[typeof(MammalSettings)].ShouldContain(typeof(MammalSettings));
        }

        [Theory]
        [InlineData("true", true)]
        [InlineData("True", true)]
        [InlineData("false", false)]
        [InlineData("False", false)]
        public void Should_Accept_Explicit_Boolan_Flag(string value, bool expected)
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddCommand<DogCommand>("dog");
            });

            // When
            var result = app.Run(new[]
            {
                "dog", "12", "4", "--alive", value,
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.IsAlive.ShouldBe(expected);
            });
        }

        [Fact]
        public void Should_Throw_When_Encountering_Unknown_Option_In_Strict_Mode()
        {
            // Given
            var app = new CommandApp();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.UseStrictParsing();
                config.AddCommand<DogCommand>("dog");
            });

            // When
            var result = Record.Exception(() => app.Run(new[] { "dog", "--foo" }));

            // Then
            result.ShouldBeOfType<CommandParseException>().And(ex =>
            {
                ex.Message.ShouldBe("Unknown option 'foo'.");
            });
        }

        [Fact]
        public void Should_Add_Unknown_Option_To_Remaining_Arguments_In_Relaxed_Mode()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "4", "dog", "12",
                "--foo", "bar",
            });

            // Then
            result.Context.ShouldNotBeNull();
            result.Context.Remaining.Parsed.Count.ShouldBe(1);
            result.Context.ShouldHaveRemainingArgument("foo", values: new[] { "bar" });
        }

        [Fact]
        public void Should_Add_Unknown_Boolean_Option_To_Remaining_Arguments_In_Relaxed_Mode()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "4", "dog", "12", "--foo",
            });

            // Then
            result.Context.ShouldNotBeNull();
            result.Context.Remaining.Parsed.Count.ShouldBe(1);
            result.Context.ShouldHaveRemainingArgument("foo", values: new[] { (string)null });
        }

        [Fact]
        public void Should_Be_Able_To_Set_The_Default_Command()
        {
            // Given
            var app = new CommandAppTester();
            app.SetDefaultCommand<DogCommand>();

            // When
            var result = app.Run(new[]
            {
                "4", "12", "--good-boy", "--name", "Rufus",
            });

            // Then
            result.ExitCode.ShouldBe(0);
            result.Settings.ShouldBeOfType<DogSettings>().And(dog =>
            {
                dog.Legs.ShouldBe(4);
                dog.Age.ShouldBe(12);
                dog.GoodBoy.ShouldBe(true);
                dog.Name.ShouldBe("Rufus");
            });
        }

        [Fact]
        public void Should_Set_Command_Name_In_Context()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "4", "dog", "12",
            });

            // Then
            result.Context.ShouldNotBeNull();
            result.Context.Name.ShouldBe("dog");
        }

        [Fact]
        public void Should_Pass_Command_Data_In_Context()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.PropagateExceptions();
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog").WithData(123);
                });
            });

            // When
            var result = app.Run(new[]
            {
                "animal", "4", "dog", "12",
            });

            // Then
            result.Context.ShouldNotBeNull();
            result.Context.Data.ShouldBe(123);
        }

        public sealed class Delegate_Commands
        {
            [Fact]
            public void Should_Execute_Delegate_Command_At_Root_Level()
            {
                // Given
                var dog = default(DogSettings);
                var data = 0;

                var app = new CommandApp();
                app.Configure(config =>
                {
                    config.PropagateExceptions();
                    config.AddDelegate<DogSettings>(
                        "foo", (context, settings) =>
                        {
                            dog = settings;
                            data = (int)context.Data;
                            return 1;
                        }).WithData(2);
                });

                // When
                var result = app.Run(new[] { "foo", "4", "12" });

                // Then
                result.ShouldBe(1);
                dog.ShouldNotBeNull();
                dog.Age.ShouldBe(12);
                dog.Legs.ShouldBe(4);
                data.ShouldBe(2);
            }

            [Fact]
            public void Should_Execute_Nested_Delegate_Command()
            {
                // Given
                var dog = default(DogSettings);
                var data = 0;

                var app = new CommandApp();
                app.Configure(config =>
                {
                    config.PropagateExceptions();
                    config.AddBranch<AnimalSettings>("foo", foo =>
                    {
                        foo.AddDelegate<DogSettings>(
                            "bar", (context, settings) =>
                            {
                                dog = settings;
                                data = (int)context.Data;
                                return 1;
                            }).WithData(2);
                    });
                });

                // When
                var result = app.Run(new[] { "foo", "4", "bar", "12" });

                // Then
                result.ShouldBe(1);
                dog.ShouldNotBeNull();
                dog.Age.ShouldBe(12);
                dog.Legs.ShouldBe(4);
                data.ShouldBe(2);
            }
        }

        public sealed class Remaining_Arguments
        {
            [Fact]
            public void Should_Register_Remaining_Parsed_Arguments_With_Context()
            {
                // Given
                var app = new CommandAppTester();
                app.Configure(config =>
                {
                    config.PropagateExceptions();
                    config.AddBranch<AnimalSettings>("animal", animal =>
                    {
                        animal.AddCommand<DogCommand>("dog");
                    });
                });

                // When
                var result = app.Run(new[]
                {
                    "animal", "4", "dog", "12", "--",
                    "--foo", "bar", "--foo", "baz",
                    "-bar", "\"baz\"", "qux",
                });

                // Then
                result.Context.Remaining.Parsed.Count.ShouldBe(4);
                result.Context.ShouldHaveRemainingArgument("foo", values: new[] { "bar", "baz" });
                result.Context.ShouldHaveRemainingArgument("b", values: new[] { (string)null });
                result.Context.ShouldHaveRemainingArgument("a", values: new[] { (string)null });
                result.Context.ShouldHaveRemainingArgument("r", values: new[] { (string)null });
            }

            [Fact]
            public void Should_Register_Remaining_Raw_Arguments_With_Context()
            {
                // Given
                var app = new CommandAppTester();
                app.Configure(config =>
                {
                    config.PropagateExceptions();
                    config.AddBranch<AnimalSettings>("animal", animal =>
                    {
                        animal.AddCommand<DogCommand>("dog");
                    });
                });

                // When
                var result = app.Run(new[]
                {
                    "animal", "4", "dog", "12", "--",
                    "--foo", "bar", "-bar", "\"baz\"", "qux",
                });

                // Then
                result.Context.Remaining.Raw.Count.ShouldBe(5);
                result.Context.Remaining.Raw[0].ShouldBe("--foo");
                result.Context.Remaining.Raw[1].ShouldBe("bar");
                result.Context.Remaining.Raw[2].ShouldBe("-bar");
                result.Context.Remaining.Raw[3].ShouldBe("baz");
                result.Context.Remaining.Raw[4].ShouldBe("qux");
            }
        }

        public sealed class Exception_Handling
        {
            [Fact]
            public void Should_Not_Propagate_Runtime_Exceptions_If_Not_Explicitly_Told_To_Do_So()
            {
                // Given
                var app = new CommandAppTester();
                app.Configure(config =>
                {
                    config.AddBranch<AnimalSettings>("animal", animal =>
                    {
                        animal.AddCommand<DogCommand>("dog");
                        animal.AddCommand<HorseCommand>("horse");
                    });
                });

                // When
                var result = app.Run(new[] { "animal", "4", "dog", "101", "--name", "Rufus" });

                // Then
                result.ExitCode.ShouldBe(-1);
            }

            [Fact]
            public void Should_Not_Propagate_Exceptions_If_Not_Explicitly_Told_To_Do_So()
            {
                // Given
                var app = new CommandAppTester();
                app.Configure(config =>
                {
                    config.AddCommand<ThrowingCommand>("throw");
                });

                // When
                var result = app.Run(new[] { "throw" });

                // Then
                result.ExitCode.ShouldBe(-1);
            }
        }
    }
}