using System.Text.Json;
using FluentAssertions;
using Scripting.Application.Services;
using Xunit;

namespace BuildFlow.Scripting.Tests;

/// <summary>
/// ScriptExecutionService.ParseVariables 类型映射逻辑测试（纯函数，无需 DI/数据库）。
/// 验证 JSON 输入被正确转为原生 .NET 类型，让脚本能直接 (decimal)Variables["x"] 而非操作 JsonElement。
/// </summary>
public class ScriptExecutionServiceParseVariablesTests
{
    // ParseVariables 是 internal static，通过 InternalsVisibleTo 暴露给本测试程序集
    private static IReadOnlyDictionary<string, object?> Parse(string json)
        => ScriptExecutionService.ParseVariables(json);

    [Fact]
    public void Empty_Or_Whitespace_Input_Returns_Empty_Dictionary()
    {
        Parse("").Should().BeEmpty();
        Parse("   ").Should().BeEmpty();
    }

    [Fact]
    public void Integer_Number_Maps_To_Long()
    {
        var vars = Parse("{\"count\": 42, \"big\": 9007199254740993}");

        vars["count"].Should().BeOfType<long>().Which.Should().Be(42L);
        // 9007199254740993 超出 double 精度但 long 可表示，应保持 long
        vars["big"].Should().BeOfType<long>().Which.Should().Be(9007199254740993L);
    }

    [Fact]
    public void Decimal_Number_Maps_To_Decimal_For_Money_Friendliness()
    {
        var vars = Parse("{\"price\": 19.99}");

        vars["price"].Should().BeOfType<decimal>().Which.Should().Be(19.99m);
    }

    [Fact]
    public void Bool_Maps_To_Boolean()
    {
        var vars = Parse("{\"active\": true, \"deleted\": false}");

        vars["active"].Should().BeOfType<bool>().Which.Should().BeTrue();
        vars["deleted"].Should().BeOfType<bool>().Which.Should().BeFalse();
    }

    [Fact]
    public void Null_Maps_To_Null()
    {
        var vars = Parse("{\"name\": null}");

        vars["name"].Should().BeNull();
    }

    [Fact]
    public void Plain_String_Maps_To_String()
    {
        var vars = Parse("{\"title\": \"hello world\"}");

        vars["title"].Should().BeOfType<string>().Which.Should().Be("hello world");
    }

    [Fact]
    public void Iso8601_String_Maps_To_DateTime()
    {
        var vars = Parse("{\"createdAt\": \"2026-07-06T10:30:00Z\"}");

        vars["createdAt"].Should().BeOfType<DateTime>();
        var dt = (DateTime)vars["createdAt"]!;
        dt.Year.Should().Be(2026);
        dt.Month.Should().Be(7);
        dt.Day.Should().Be(6);
        dt.Hour.Should().Be(10);
        dt.Minute.Should().Be(30);
    }

    [Fact]
    public void Guid_String_Maps_To_Guid()
    {
        var guidStr = "f47ac10b-58cc-4372-a567-0e02b2c3d479";
        var vars = Parse("{\"id\": \"" + guidStr + "\"}");

        vars["id"].Should().BeOfType<Guid>();
        ((Guid)vars["id"]!).Should().Be(Guid.Parse(guidStr));
    }

    /// <summary>ISO 8601 日期优先于 Guid（日期串不会误判为 Guid）。</summary>
    [Fact]
    public void Date_Parsed_Before_Guid_Check()
    {
        var vars = Parse("{\"ts\": \"2026-01-15\"}");
        vars["ts"].Should().BeOfType<DateTime>();
    }

    [Fact]
    public void Object_Maps_To_JsonElement()
    {
        var vars = Parse("{\"nested\": {\"a\": 1, \"b\": 2}}");

        vars["nested"].Should().BeOfType<JsonElement>();
        var el = (JsonElement)vars["nested"]!;
        el.ValueKind.Should().Be(JsonValueKind.Object);
    }

    [Fact]
    public void Array_Maps_To_JsonElement()
    {
        var vars = Parse("{\"items\": [1, 2, 3]}");

        vars["items"].Should().BeOfType<JsonElement>();
        var el = (JsonElement)vars["items"]!;
        el.ValueKind.Should().Be(JsonValueKind.Array);
        el.GetArrayLength().Should().Be(3);
    }

    [Fact]
    public void Mixed_Types_All_Resolve_Correctly()
    {
        var json = "{\"count\": 100, \"price\": 49.95, \"active\": true, \"name\": \"widget\", "
                 + "\"id\": \"f47ac10b-58cc-4372-a567-0e02b2c3d479\", \"date\": \"2026-07-06T00:00:00\", "
                 + "\"meta\": {\"key\": \"val\"}, \"nullable\": null}";

        var vars = Parse(json);

        vars["count"].Should().BeOfType<long>();
        vars["price"].Should().BeOfType<decimal>();
        vars["active"].Should().BeOfType<bool>();
        vars["name"].Should().BeOfType<string>();
        vars["id"].Should().BeOfType<Guid>();
        vars["date"].Should().BeOfType<DateTime>();
        vars["meta"].Should().BeOfType<JsonElement>();
        vars["nullable"].Should().BeNull();
    }

    /// <summary>脚本端典型用法：原生类型可直接强转，无需 GetInt64() 等中间步骤。</summary>
    [Fact]
    public void Script_Idiom_Direct_Cast_Works()
    {
        var vars = Parse("{\"qty\": 5, \"rate\": 12.5}");

        // 模拟脚本里写 (long)Variables["qty"] * (decimal)Variables["rate"]
        var result = (long)vars["qty"]! * (decimal)vars["rate"]!;
        result.Should().Be(62.5m);
    }

    /// <summary>Ordinal 键比较器：键名大小写敏感。</summary>
    [Fact]
    public void Keys_Are_Case_Sensitive_Ordinal()
    {
        var vars = Parse("{\"Name\": \"a\", \"name\": \"b\"}");

        vars.Should().HaveCount(2);
        vars["Name"].Should().Be("a");
        vars["name"].Should().Be("b");
    }
}