using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;
using UnityEngine;
using UnityEngine.Assertions;

namespace UDE_HAND_INTERACTION
{
    public static class AssertManager
    {
        public const string HiglightColor = "#3366ff";

        [Conditional("UNITY_ASSERTIONS")]
        public static void AssertField<TValue>(this Component component,
                TValue value, string variableName,
                string whyItFailed = null, string whereItFailed = null, string howToFix = null)
                where TValue : class
        {
            string gameObjectName = component.name;
            string componentName = component.GetType().Name;
            string niceVariableName = Nicify(variableName);
            string variableType = typeof(TValue).Name;

            Assert.IsNotNull(value,
                (whereItFailed ?? $"At GameObject <color={HiglightColor}><b>{gameObjectName}</b></color>, component <b>{componentName}</b>. ") +
                (whyItFailed ?? $"Required <b>{niceVariableName}</b> reference is missing. ") +
                (howToFix ?? $"Assign a <b>{variableType}</b> to the field <b>{niceVariableName}</b>."));
        }

        [Conditional("UNITY_ASSERTIONS")]
        public static void AssertCollectionItems<TValue>(this Component component,
            IEnumerable<TValue> value, string variableName,
            string whyItFailed = null, string whereItFailed = null, string howToFix = null)
        {
            string gameObjectName = component.name;
            string componentName = component.GetType().Name;
            string niceVariableName = Nicify(variableName);
            string variableType = typeof(TValue).Name;

            int index = 0;
            foreach (TValue item in value)
            {
                Assert.IsFalse(item is null,
                    (whereItFailed ?? $"At GameObject <color={HiglightColor}><b>{gameObjectName}</b></color>, component <b>{componentName}</b>. ") +
                    (whyItFailed ?? $"Invalid item in the collection <b>{niceVariableName}</b> at index <b>{index}</b>. ") +
                    (howToFix ?? $"Assign a <b>{variableType}</b> to the collection <b>{niceVariableName}</b> at index <b>{index}</b>. "));
                index++;
            }
        }

        [Conditional("UNITY_ASSERTIONS")]
        public static void AssertCollectionField<TValue>(this Component component,
            IEnumerable<TValue> value, string variableName,
            string whyItFailed = null, string whereFailed = null, string howToFix = null)
        {

            string gameObjectName = component.name;
            string componentName = component.GetType().Name;
            string niceVariableName = Nicify(variableName);
            string variableType = typeof(TValue).Name;

            Assert.IsTrue(value != null && value.Count() > 0,
                (whereFailed ?? $"At GameObject <color={HiglightColor}><b>{gameObjectName}</b></color>: the <b>{componentName}</b> component has an missing or empty <b>{niceVariableName}</b> collection. ") +
                (whyItFailed ?? "") +
                (howToFix ?? $"Assign at least one <b>{variableType}</b> to the collection <b>{niceVariableName}</b>. "));

            component.AssertCollectionItems(value, variableName);
        }

        public static string Nicify(string variableName)
        {
            variableName = Regex.Replace(variableName, "_([a-z])", match => match.Value.ToUpper(), RegexOptions.Compiled);
            variableName = Regex.Replace(variableName, "m_|_", " ", RegexOptions.Compiled);
            variableName = Regex.Replace(variableName, "k([A-Z])", "$1", RegexOptions.Compiled);
            variableName = Regex.Replace(variableName, "([A-Z])", " $1", RegexOptions.Compiled);
            variableName = variableName.Trim();
            return variableName;
        }
    }
}