using System;


namespace UniJSON
{


    public class JsonSchemaValidationContext
    {
        string[] m_stack = new string[64];
        int m_pos;

        public JsonSchemaValidationContext(object o)
        {
            Push(o.GetType().Name);
        }

        public ActionDisposer Push(object o)
        {
            m_stack[m_pos++] = o.ToString();
            return new ActionDisposer(Pop);
        }

        public void Pop()
        {
            --m_pos;
        }

        public override string ToString()
        {
            return string.Join(".", m_stack, 0, m_pos);
        }
    }


    public class JsonSchemaValidationException : Exception
    {
        public Exception Error
        {
            get; private set;
        }

        public JsonSchemaValidationException(JsonSchemaValidationContext context, string msg) : base(string.Format("[{0}] {1}", context, msg))
        {
        }

        public JsonSchemaValidationException(JsonSchemaValidationContext context, Exception ex) : base(string.Format("[{0}] {1}", context, ex))
        {
            Error = ex;
        }
    }


    public interface IJsonSchemaValidator
    {
        void Assign(IJsonSchemaValidator obj);

        bool Parse(IFileSystemAccessor fs, string key, JsonNode value);

        /// <summary>
        /// 
        /// </summary>
        /// <param name="o"></param>
        /// <returns>return null if validate value</returns>
        JsonSchemaValidationException Validate(JsonSchemaValidationContext context, Object o);

        void Serialize(JsonFormatter f, JsonSchemaValidationContext context, Object o);

        void ToJson(JsonFormatter f);
    }
}