using System;
using System.IO;
using GeViSetEditor.Core.Parsers;
using GeViSetEditor.Core.Writers;

namespace GeViSetEditor.CLI.Commands
{
    public static class TestRoundTripCommand
    {
        public static void Execute(string inputPath)
        {
            Console.WriteLine("=== Round-Trip Conversion Test ===\n");

            if (!File.Exists(inputPath))
            {
                Console.WriteLine($"Error: File not found: {inputPath}");
                return;
            }

            try
            {
                // Step 1: Read original file
                Console.WriteLine($"Step 1: Reading original file...");
                byte[] originalData = File.ReadAllBytes(inputPath);
                Console.WriteLine($"  Read {originalData.Length} bytes\n");

                // Step 2: Parse with safe parser
                Console.WriteLine($"Step 2: Parsing file...");
                var parser = new SafeSetFileParser();
                var setFile = parser.Parse(originalData);
                Console.WriteLine($"  Parsed successfully");
                Console.WriteLine($"  Found {setFile.ActionMappings.Count} action mappings\n");

                // Step 3: Write back
                Console.WriteLine($"Step 3: Writing file back...");
                var writer = new SafeSetFileWriter();
                byte[] outputData = writer.Write(setFile);
                Console.WriteLine($"  Written {outputData.Length} bytes\n");

                // Step 4: Compare
                Console.WriteLine($"Step 4: Comparing original vs output...");
                var comparison = writer.Compare(originalData, outputData);

                if (comparison.IsIdentical)
                {
                    Console.WriteLine("\n✓✓✓ SUCCESS! Round-trip conversion is PERFECT!");
                    Console.WriteLine("    Original and output files are byte-for-byte identical.");
                    Console.WriteLine("    Safe to write back to GeViServer!");
                }
                else
                {
                    Console.WriteLine($"\n✗✗✗ WARNING! Files differ in {comparison.DifferentBytes} bytes");
                    Console.WriteLine("\nFirst differences:");
                    foreach (var diff in comparison.Differences)
                    {
                        Console.WriteLine($"  {diff}");
                    }
                    Console.WriteLine("\n!!! DO NOT write to server until this is fixed !!!");
                }

                // Step 5: Show extracted action mappings
                Console.WriteLine($"\n" + new string('=', 70));
                Console.WriteLine("EXTRACTED ACTION MAPPINGS");
                Console.WriteLine(new string('=', 70));

                int count = 0;
                foreach (var mapping in setFile.ActionMappings)
                {
                    count++;
                    Console.WriteLine($"\nMapping #{count} at offset {mapping.FileOffset}:");
                    Console.WriteLine($"  Actions ({mapping.Actions.Count}):");

                    int actionNum = 0;
                    foreach (var action in mapping.Actions)
                    {
                        actionNum++;
                        Console.WriteLine($"    {actionNum}. {action}");
                        if (actionNum >= 5 && mapping.Actions.Count > 5)
                        {
                            Console.WriteLine($"    ... and {mapping.Actions.Count - 5} more");
                            break;
                        }
                    }
                }

                Console.WriteLine($"\n" + new string('=', 70));
                Console.WriteLine($"Total: {setFile.ActionMappings.Count} mappings");
                Console.WriteLine(new string('=', 70));
            }
            catch (Exception ex)
            {
                Console.WriteLine($"\n✗✗✗ ERROR: {ex.Message}");
                Console.WriteLine($"Stack trace: {ex.StackTrace}");
            }
        }
    }
}