using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;
using Bit.Core.Utilities;
using Bit.Test.Common.Helpers;
using Xunit;

namespace Bit.Core.Test.Utilities
{
    public class PermissiveStringConverterTests
    {
        private const string numberJson = "{ \"StringProp\": 1, \"EnumerableStringProp\": [ 2, 3 ]}";
        private const string stringJson = "{ \"StringProp\": \"1\", \"EnumerableStringProp\": [ \"2\", \"3\" ]}";
        private const string nullAndEmptyJson = "{ \"StringProp\": null, \"EnumerableStringProp\": [] }";
        private const string singleValueJson = "{ \"StringProp\": 1, \"EnumerableStringProp\": \"Hello!\" }";
        private const string nullJson = "{ \"StringProp\": null, \"EnumerableStringProp\": null }";
        private const string boolJson = "{ \"StringProp\": true, \"EnumerableStringProp\": [ false, 1.2]}";
        private const string objectJsonOne = "{ \"StringProp\": { \"Message\": \"Hi\"}, \"EnumerableStringProp\": []}";
        private const string objectJsonTwo = "{ \"StringProp\": \"Hi\", \"EnumerableStringProp\": {}}";
        private readonly string bigNumbersJson =
        "{ \"StringProp\":" + decimal.MinValue + ", \"EnumerableStringProp\": [" + ulong.MaxValue + ", " + long.MinValue + "]}";

        [Theory]
        [InlineData(numberJson)]
        [InlineData(stringJson)]
        public void Read_Success(string json)
        {
            var obj = JsonSerializer.Deserialize<TestObject>(json);
            Assert.Equal("1", obj.StringProp);
            Assert.Equal(2, obj.EnumerableStringProp.Count());
            Assert.Equal("2", obj.EnumerableStringProp.ElementAt(0));
            Assert.Equal("3", obj.EnumerableStringProp.ElementAt(1));
        }

        [Fact]
        public void Read_Boolean_Success()
        {
            var obj = JsonSerializer.Deserialize<TestObject>(boolJson);
            Assert.Equal("True", obj.StringProp);
            Assert.Equal(2, obj.EnumerableStringProp.Count());
            Assert.Equal("False", obj.EnumerableStringProp.ElementAt(0));
            Assert.Equal("1.2", obj.EnumerableStringProp.ElementAt(1));
        }

        [Fact]
        public void Read_BigNumbers_Success()
        {
            var obj = JsonSerializer.Deserialize<TestObject>(bigNumbersJson);
            Assert.Equal(decimal.MinValue.ToString(), obj.StringProp);
            Assert.Equal(2, obj.EnumerableStringProp.Count());
            Assert.Equal(ulong.MaxValue.ToString(), obj.EnumerableStringProp.ElementAt(0));
            Assert.Equal(long.MinValue.ToString(), obj.EnumerableStringProp.ElementAt(1));
        }

        [Fact]
        public void Read_SingleValue_Success()
        {
            var obj = JsonSerializer.Deserialize<TestObject>(singleValueJson);
            Assert.Equal("1", obj.StringProp);
            Assert.Single(obj.EnumerableStringProp);
            Assert.Equal("Hello!", obj.EnumerableStringProp.ElementAt(0));
        }

        [Fact]
        public void Read_NullAndEmptyJson_Success()
        {
            var obj = JsonSerializer.Deserialize<TestObject>(nullAndEmptyJson);
            Assert.Null(obj.StringProp);
            Assert.Empty(obj.EnumerableStringProp);
        }

        [Fact]
        public void Read_Null_Success()
        {
            var obj = JsonSerializer.Deserialize<TestObject>(nullJson);
            Assert.Null(obj.StringProp);
            Assert.Null(obj.EnumerableStringProp);
        }

        [Theory]
        [InlineData(objectJsonOne)]
        [InlineData(objectJsonTwo)]
        public void Read_Object_Throws(string json)
        {
            var exception = Assert.Throws<JsonException>(() => JsonSerializer.Deserialize<TestObject>(json));
        }

        [Fact]
        public void Write_Success()
        {
            var json = JsonSerializer.Serialize(new TestObject
            {
                StringProp = "1",
                EnumerableStringProp = new List<string>
                {
                    "2",
                    "3",
                },
            });

            var jsonElement = JsonDocument.Parse(json).RootElement;

            var stringProp = AssertHelper.AssertJsonProperty(jsonElement, "StringProp", JsonValueKind.String);
            Assert.Equal("1", stringProp.GetString());
            var list = AssertHelper.AssertJsonProperty(jsonElement, "EnumerableStringProp", JsonValueKind.Array);
            Assert.Equal(2, list.GetArrayLength());
            var firstElement = list[0];
            Assert.Equal(JsonValueKind.String, firstElement.ValueKind);
            Assert.Equal("2", firstElement.GetString());
            var secondElement = list[1];
            Assert.Equal(JsonValueKind.String, secondElement.ValueKind);
            Assert.Equal("3", secondElement.GetString());
        }

        [Fact]
        public void Write_Null()
        {
            // When the values are null the converters aren't actually ran and it automatically serializes null
            var json = JsonSerializer.Serialize(new TestObject
            {
                StringProp = null,
                EnumerableStringProp = null,
            });

            var jsonElement = JsonDocument.Parse(json).RootElement;

            AssertHelper.AssertJsonProperty(jsonElement, "StringProp", JsonValueKind.Null);
            AssertHelper.AssertJsonProperty(jsonElement, "EnumerableStringProp", JsonValueKind.Null);
        }

        [Fact]
        public void Write_Empty()
        {
            // When the values are null the converters aren't actually ran and it automatically serializes null
            var json = JsonSerializer.Serialize(new TestObject
            {
                StringProp = "",
                EnumerableStringProp = Enumerable.Empty<string>(),
            });

            var jsonElement = JsonDocument.Parse(json).RootElement;

            var stringVal = AssertHelper.AssertJsonProperty(jsonElement, "StringProp", JsonValueKind.String).GetString();
            Assert.Equal("", stringVal);
            var array = AssertHelper.AssertJsonProperty(jsonElement, "EnumerableStringProp", JsonValueKind.Array);
            Assert.Equal(0, array.GetArrayLength());
        }
    }

    public class TestObject
    {
        [JsonConverter(typeof(PermissiveStringConverter))]
        public string StringProp { get; set; }

        [JsonConverter(typeof(PermissiveStringEnumerableConverter))]
        public IEnumerable<string> EnumerableStringProp { get; set; }
    }
}