// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

namespace System.Data.Entity.Migrations
{
    using System.Data.Entity.Migrations.Design;
    using System.Data.Entity.Migrations.History;
    using System.Data.Entity.Migrations.Infrastructure;
    using System.Data.Entity.Migrations.Sql;
    using System.Data.Entity.Resources;
    using Xunit;

    public class DbMigrationsConfigurationTests
    {
        private class TestMigrationsConfiguration : DbMigrationsConfiguration
        {
        }

        [Fact]
        public void Can_get_and_set_migration_context_properties()
        {
            var migrationsConfiguration = new TestMigrationsConfiguration
                                              {
                                                  AutomaticMigrationsEnabled = false,
                                                  CodeGenerator = new CSharpMigrationCodeGenerator(),
                                                  ContextType = typeof(ShopContext_v1)
                                              };

            Assert.False(migrationsConfiguration.AutomaticMigrationsEnabled);
            Assert.NotNull(migrationsConfiguration.CodeGenerator);
            Assert.NotNull(migrationsConfiguration.ContextType);
        }

        [Fact]
        public void Can_get_and_set_sql_generator()
        {
            var migrationsConfiguration = new TestMigrationsConfiguration();
            var migrationSqlGenerator = new SqlServerMigrationSqlGenerator();

            migrationsConfiguration.SetSqlGenerator(DbProviders.Sql, migrationSqlGenerator);

            Assert.Same(migrationSqlGenerator, migrationsConfiguration.GetSqlGenerator(DbProviders.Sql));
        }

        [Fact]
        public void GetSqlGenerator_should_throw_when_no_generator_registered_for_provider()
        {
            var migrationsConfiguration = new TestMigrationsConfiguration();

            var exception = Assert.Throws<MigrationsException>(() => migrationsConfiguration.GetSqlGenerator("Foomatic"));

            Assert.Equal(Strings.NoSqlGeneratorForProvider("Foomatic"), exception.Message);
        }

        [Fact]
        public void Providers_are_assigned_by_default()
        {
            var migrationsConfiguration = new TestMigrationsConfiguration();

            Assert.NotNull(migrationsConfiguration.CodeGenerator);
            Assert.NotNull(migrationsConfiguration.GetSqlGenerator(DbProviders.Sql));
            Assert.NotNull(migrationsConfiguration.GetSqlGenerator(DbProviders.SqlCe));
        }

        [Fact]
        public void ContextKey_is_assigned_by_default()
        {
            var migrationsConfiguration = new TestMigrationsConfiguration();

            Assert.Equal(migrationsConfiguration.GetType().FullName, migrationsConfiguration.ContextKey);
        }

        [Fact]
        public void Can_get_and_set_context_key()
        {
            var migrationsConfiguration
                = new TestMigrationsConfiguration
                      {
                          ContextKey = "Foo"
                      };

            Assert.Equal("Foo", migrationsConfiguration.ContextKey);
        }

        [Fact]
        public void ContextKey_restricts_length_to_context_key_max_length()
        {
            var migrationsConfiguration
                = new TestMigrationsConfiguration
                {
                    ContextKey = new string('a', 600)
                };

            Assert.Equal(new string('a', HistoryContext.ContextKeyMaxLength), migrationsConfiguration.ContextKey);
        }

        [Fact]
        public void Cannot_set_context_key_to_whitespace()
        {
            Assert.Throws<ArgumentException>(
                () => new TestMigrationsConfiguration
                          {
                              ContextKey = " "
                          });
            Assert.Throws<ArgumentException>(
                () => new TestMigrationsConfiguration
                          {
                              ContextKey = ""
                          });
            Assert.Throws<ArgumentException>(
                () => new TestMigrationsConfiguration
                          {
                              ContextKey = null
                          });
        }
    }
}