/*
Yarn Spinner is licensed to you under the terms found in the file LICENSE.md.
*/

using System;
#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
#endif

namespace Yarn.Unity
{
#nullable enable
    public interface ILogger : IDisposable
    {
        void Write(object obj);
        void WriteLine(object obj);
        void WriteException(System.Exception ex, string? message = null);

        void Inc();
        void Dec();
        void SetDepth(int depth);
    }

    public class FileLogger : ILogger
    {
        System.IO.TextWriter writer;
        private int depth = 0;

        public FileLogger(System.IO.TextWriter writer)
        {
            this.writer = writer;
        }

        public void Dispose()
        {
            writer.Flush();
            writer.Dispose();
        }

        public void Write(object text)
        {
            var tabs = new String('\t', depth);
            writer.Write(tabs + text);
        }

        public void WriteLine(object text)
        {
            var tabs = new String('\t', depth);
            writer.WriteLine(tabs + text);
        }
        public void WriteException(System.Exception ex, string? message)
        {
            var tabs = new String('\t', depth);
            if (message == null)
            {
                writer.WriteLine($"{tabs}Exception: {ex.Message}");
            }
            else
            {
                writer.WriteLine($"{tabs}{message}: {ex.Message}");
            }
        }

        public void Inc()
        {
            depth +=1 ;
        }
        public void Dec()
        {
            depth = Math.Max(depth - 1, 0);
        }
        public void SetDepth(int depth)
        {
            this.depth = Math.Max(depth, 0);
        }
    }

    public class UnityLogger : ILogger
    {
        public void Dispose() { }

        public void Write(object text)
        {
            WriteLine(text);
        }

        public void WriteLine(object text)
        {
            var tabs = new String('\t', depth);
#if UNITY_EDITOR
            Debug.LogWarning(tabs + text.ToString());
#endif
        }

        public void WriteException(System.Exception ex, string? message = null)
        {
#if UNITY_EDITOR
            Debug.LogException(ex);
#endif
        }

        private int depth = 0;
        public void Inc()
        {
            depth +=1 ;
        }
        public void Dec()
        {
            depth = Math.Max(depth - 1, 0);
        }
        public void SetDepth(int depth)
        {
            this.depth = Math.Max(depth, 0);
        }
    }

    public class NullLogger : ILogger
    {
        public void Dispose() { }

        public void Write(object text) { }

        public void WriteLine(object text) { }

        public void WriteException(System.Exception ex, string? message = null) { }

        public void Inc(){}
        public void Dec(){}
        public void SetDepth(int depth) {}
    }
}