using FluentAssertions;
using Workflow.Application.Form.Schema;
using Xunit;

namespace Workflow.Tests.Form;

public class FormDataValidatorTests
{
    private const string Schema = """
    {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "title": "姓名",
          "required": true,
          "x-component": "Input",
          "x-validator": [
            { "type": "minLength", "value": 2, "message": "姓名至少 2 个字符" }
          ]
        },
        "age": {
          "type": "number",
          "title": "年龄",
          "x-component": "InputNumber",
          "x-validator": [
            { "type": "min", "value": 0, "message": "年龄不能小于 0" },
            { "type": "max", "value": 150, "message": "年龄不能大于 150" }
          ]
        },
        "gender": {
          "type": "string",
          "title": "性别",
          "required": true,
          "x-component": "Select",
          "x-data-source": {
            "type": "static",
            "options": [
              { "label": "男", "value": "male" },
              { "label": "女", "value": "female" }
            ]
          }
        }
      }
    }
    """;

    private static readonly HashSet<string> AllowedComponents = ["Input", "InputNumber", "Select"];

    [Fact]
    public void Validate_WithValidData_ReturnsValid()
    {
        var result = FormDataValidator.Validate(Schema, """{"name":"张三","age":25,"gender":"male"}""", AllowedComponents);

        result.IsValid.Should().BeTrue(string.Join("; ", result.Errors));
        result.Errors.Should().BeEmpty();
    }

    [Fact]
    public void Validate_WithMissingRequiredField_ReturnsFieldError()
    {
        var result = FormDataValidator.Validate(Schema, """{"age":25,"gender":"male"}""", AllowedComponents);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("姓名") && e.Contains("必填"));
    }

    [Fact]
    public void Validate_WithEnumMismatch_ReturnsFieldError()
    {
        var result = FormDataValidator.Validate(Schema, """{"name":"张三","age":25,"gender":"other"}""", AllowedComponents);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("gender") && e.Contains("允许范围"));
    }

    [Fact]
    public void Validate_WithLengthAndRangeViolations_ReturnsAllErrors()
    {
        var result = FormDataValidator.Validate(Schema, """{"name":"李","age":151,"gender":"male"}""", AllowedComponents);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("姓名至少 2 个字符"));
        result.Errors.Should().Contain(e => e.Contains("年龄不能大于 150"));
    }

    [Fact]
    public void Validate_HiddenFieldByReaction_SkipsRequiredCheck()
    {
        // leaveType != sick 时（visible 规则未命中），reason 被联动隐藏。
        // reason 即使必填缺失也不应报错。
        const string schema = """
        {
          "type": "object",
          "properties": {
            "leaveType": {
              "type": "string",
              "title": "请假类型",
              "x-component": "Select",
              "x-reactions": [
                {
                  "type": "condition",
                  "target": "reason",
                  "when": { "source": "leaveType", "operator": "eq", "value": "sick" },
                  "action": "visible"
                }
              ]
            },
            "reason": {
              "type": "string",
              "title": "原因",
              "required": true,
              "x-component": "Input"
            }
          }
        }
        """;

        // leaveType=annual 未命中 visible 规则 → reason 隐藏 → 跳过必填
        var result = FormDataValidator.Validate(
            schema,
            """{"leaveType":"annual"}""",
            ["Input", "Select"]);

        result.IsValid.Should().BeTrue(string.Join("; ", result.Errors));
    }

    [Fact]
    public void Validate_NestedFieldInContainer_ReadsValueByDottedPath()
    {
        // FormGrid/FormLayout 等容器下的嵌套字段：field.Path 为点分路径（dateRange.startDate），
        // 提交数据是嵌套对象 {dateRange:{startDate:...}}。校验器必须按点分路径取值，
        // 否则嵌套必填字段会被误判为缺失，导致带容器的表单无法通过校验。
        const string schema = """
        {
          "type": "object",
          "properties": {
            "leaveType": {
              "type": "string",
              "title": "请假类型",
              "required": true,
              "x-component": "Select"
            },
            "dateRange": {
              "type": "void",
              "title": "日期范围",
              "x-component": "FormGrid",
              "properties": {
                "startDate": {
                  "type": "string",
                  "title": "开始日期",
                  "required": true,
                  "x-component": "DatePicker"
                },
                "endDate": {
                  "type": "string",
                  "title": "结束日期",
                  "required": true,
                  "x-component": "DatePicker"
                }
              }
            }
          }
        }
        """;

        var result = FormDataValidator.Validate(
            schema,
            """{"leaveType":"annual","dateRange":{"startDate":"2026-06-15","endDate":"2026-06-16"}}""",
            ["Input", "Select", "DatePicker", "FormGrid"]);

        result.IsValid.Should().BeTrue(string.Join("; ", result.Errors));
    }

    [Fact]
    public void Validate_NestedFieldMissing_ReportsRequiredError()
    {
        const string schema = """
        {
          "type": "object",
          "properties": {
            "dateRange": {
              "type": "void",
              "x-component": "FormGrid",
              "properties": {
                "startDate": {
                  "type": "string",
                  "title": "开始日期",
                  "required": true,
                  "x-component": "DatePicker"
                }
              }
            }
          }
        }
        """;

        var result = FormDataValidator.Validate(
            schema,
            """{"dateRange":{}}""",
            ["DatePicker", "FormGrid"]);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("开始日期") && e.Contains("必填"));
    }

    [Fact]
    public void Validate_VisibleRequiredField_StillEnforced()
    {
        // leaveType=sick 时（visible 规则命中），reason 可见且必填，缺失应报错
        const string schema = """
        {
          "type": "object",
          "properties": {
            "leaveType": {
              "type": "string",
              "title": "请假类型",
              "x-component": "Select",
              "x-reactions": [
                {
                  "type": "condition",
                  "target": "reason",
                  "when": { "source": "leaveType", "operator": "eq", "value": "sick" },
                  "action": "visible"
                }
              ]
            },
            "reason": {
              "type": "string",
              "title": "原因",
              "required": true,
              "x-component": "Input"
            }
          }
        }
        """;

        // leaveType=sick 命中 visible 规则 → reason 显示 → 必填校验生效
        var result = FormDataValidator.Validate(
            schema,
            """{"leaveType":"sick"}""",
            ["Input", "Select"]);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("原因") && e.Contains("必填"));
    }

    [Fact]
    public void Validate_FieldHiddenByPermissionForCurrentNode_SkipsRequiredCheck()
    {
        // 字段 salary 配置了在"HR审批"节点 hidden。提交时若按 HR审批 节点校验，salary 缺失应跳过必填。
        const string schema = """
        {
          "type": "object",
          "properties": {
            "name": { "type": "string", "title": "姓名", "required": true, "x-component": "Input" },
            "salary": {
              "type": "number", "title": "薪资", "required": true, "x-component": "InputNumber",
              "x-field-permission": { "HR审批": "hidden" }
            }
          }
        }
        """;

        // 不传节点：salary 是必填，缺失应报错
        var noNode = FormDataValidator.Validate(schema, """{"name":"张三"}""", ["Input", "InputNumber"]);
        noNode.IsValid.Should().BeFalse("无节点上下文时不做权限过滤，salary 必填缺失应报错");

        // 传 HR审批 节点：salary 在该节点 hidden，应跳过必填校验 → 通过
        var hrNode = FormDataValidator.Validate(
            schema, """{"name":"张三"}""", ["Input", "InputNumber"], currentNodeKey: "HR审批");
        hrNode.IsValid.Should().BeTrue(string.Join("; ", hrNode.Errors));
    }

    [Fact]
    public void Validate_FieldVisibleForCurrentNode_StillEnforcesRequired()
    {
        // salary 在"直属主管审批"节点 visible（可见可编辑），缺失应报错
        const string schema = """
        {
          "type": "object",
          "properties": {
            "salary": {
              "type": "number", "title": "薪资", "required": true, "x-component": "InputNumber",
              "x-field-permission": { "直属主管审批": "visible", "HR审批": "hidden" }
            }
          }
        }
        """;

        var result = FormDataValidator.Validate(
            schema, """{}""", ["InputNumber"], currentNodeKey: "直属主管审批");

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.Contains("薪资") && e.Contains("必填"));
    }

    [Fact]
    public void Validate_PermissionDefaultFallback_AppliesWhenNodeNotExplicitlyConfigured()
    {
        // salary 配了 __default__: hidden。当前节点"未知节点"未显式配置 → 走 default → 隐藏 → 跳过必填
        const string schema = """
        {
          "type": "object",
          "properties": {
            "salary": {
              "type": "number", "title": "薪资", "required": true, "x-component": "InputNumber",
              "x-field-permission": { "__default__": "hidden", "直属主管审批": "visible" }
            }
          }
        }
        """;

        // 直属主管审批：显式 visible → 必填生效 → 缺失报错
        var manager = FormDataValidator.Validate(
            schema, """{}""", ["InputNumber"], currentNodeKey: "直属主管审批");
        manager.IsValid.Should().BeFalse("直属主管审批节点 salary 可见，必填缺失应报错");

        // 未知节点：走 __default__ = hidden → 跳过必填 → 通过
        var unknown = FormDataValidator.Validate(
            schema, """{}""", ["InputNumber"], currentNodeKey: "未知节点");
        unknown.IsValid.Should().BeTrue("未知节点走 __default__ hidden，应跳过必填");
    }
}