package yaml_checker

import (
	"errors"
	"reflect"
)

type SchemaNode interface {
	Validate(yamlMap map[string]any) error
}

type BaseNamingSchemaNode struct {
	Type     string
	Name     string
	Describe string
	Required bool
}

type ObjectSchemaNode struct {
	BaseNamingSchemaNode
	AsArray bool
	Fields  []SchemaNode
}

func (schema *ObjectSchemaNode) Validate(yamlMap map[string]any) error {
	yamlValue, ok := yamlMap[schema.Name]
	if !ok {
		if schema.Required {
			return errors.New(schemaNodeTypeObject + "类型的yaml节点必须有" + schema.Name)
		}

		return nil
	}

	if yamlValue == nil {
		return errors.New(schemaNodeTypeObject + "类型的yaml节点的" + schema.Name + "字段没有赋值")
	}

	if schema.AsArray {
		sliceParamValues, ok := yamlValue.([]any)
		if !ok {
			return errors.New(schemaNodeTypeObject + "类型节点" + schema.Name + "的as_array为true，但是值不是数组")
		}

		for _, sliceParamValue := range sliceParamValues {
			sliceParamMapValue, ok := sliceParamValue.(map[string]any)
			if !ok {
				return errors.New(schemaNodeTypeObject + "类型节点" + schema.Name + "的值类型转换失败")
			}

			err := schema.validateValue(sliceParamMapValue)
			if err != nil {
				return err
			}
		}

		return nil
	}

	yamlMapValue, ok := yamlValue.(map[string]any)
	if !ok {
		return errors.New(schemaNodeTypeObject + "类型节点不是键值对")
	}

	err := schema.validateValue(yamlMapValue)
	if err != nil {
		return err
	}

	return nil
}

func (schema *ObjectSchemaNode) validateValue(yamlMap map[string]any) error {
	for _, field := range schema.Fields {
		err := field.Validate(yamlMap)
		if err != nil {
			return err
		}
	}

	return nil
}

type FieldSchemaNode struct {
	BaseNamingSchemaNode
	AsArray   bool
	FieldType string
}

func (schema *FieldSchemaNode) Validate(yamlMap map[string]any) error {
	yamlValue, ok := yamlMap[schema.Name]
	if !ok {
		if schema.Required {
			return errors.New(schemaNodeTypeField + "类型的yaml节点必须有" + schema.Name)
		}

		return nil
	}

	if yamlValue == nil {
		return errors.New(schemaNodeTypeField + "类型的yaml节点的" + schema.Name + "字段没有赋值")
	}

	if schema.AsArray {
		sliceParamValues, ok := yamlValue.([]any)
		if !ok {
			return errors.New(schemaNodeTypeField + "类型节点as_array为true，但是值不是数组")
		}

		for _, sliceParamValue := range sliceParamValues {
			err := schema.validateValue(sliceParamValue)
			if err != nil {
				return err
			}
		}

		return nil
	}

	err := schema.validateValue(yamlValue)
	if err != nil {
		return err
	}

	return nil
}

func (schema *FieldSchemaNode) validateValue(paramValue any) error {
	valueType := reflect.TypeOf(paramValue).String()
	if valueType != schema.FieldType {
		return errors.New(schemaNodeTypeField + "类型节点的" + schema.Name + "字段期望类型为: " + schema.FieldType + " 实际类型为: " + valueType)
	}

	return nil
}