using ExtractMethod.Tooling;
using Microsoft.CodeAnalysis;

// CLIs are boring on purpose: argument parsing and printing live here, all
// Roslyn logic lives in Tooling/ so the tests can drive it directly.

string usage = "usage: ExtractMethod <file.cs> <startLine> <endLine>  (1-based, inclusive)";

if (args.Length != 3)
{
    Console.Error.WriteLine(usage);
    return 2;
}

string file = Path.GetFullPath(args[0]);
if (!File.Exists(file))
{
    Console.Error.WriteLine($"error: file not found: {file}");
    Console.Error.WriteLine(usage);
    return 2;
}

if (!int.TryParse(args[1], out int startLine) || !int.TryParse(args[2], out int endLine))
{
    Console.Error.WriteLine($"error: line numbers must be integers");
    Console.Error.WriteLine(usage);
    return 2;
}

// 1. parse the file
var tree = CompilationLoader.ParseFile(file);

// 2. build the scratch compilation (refs from TRUSTED_PLATFORM_ASSEMBLIES)
var compilation = CompilationLoader.CreateCompilation(tree, Path.GetFileNameWithoutExtension(file));
if (compilation.GetDiagnostics().Any(d => d.Severity == DiagnosticSeverity.Error))
{
    Console.Error.WriteLine("warning: the file does not compile cleanly under a plain Roslyn compilation; reporting syntax-level resolution only");
}

// 3. snap the range to whole statements, report cleanly otherwise
var resolved = SelectionResolver.Resolve(tree, startLine, endLine);
if (!resolved.Succeeded)
{
    Console.Error.WriteLine($"error: {resolved.Error}");
    return SelectionResolver.ExitError;
}

// 4. compose the full suggestion (em 02 buckets + em 03 extract-first and
//    signature) and print the report. A composition failure is a semantic
//    resolution error: same exit code as the resolver, message on stderr,
//    but never a stack trace.
var model = compilation.GetSemanticModel(tree);
try
{
    var extraction = ExtractionReporter.Compose(model, resolved);
    Console.Write(ReportFormatter.Format(extraction));
}
catch (Exception e) when (e is InvalidOperationException or ArgumentException)
{
    Console.Error.WriteLine($"error: data-flow analysis failed: {e.Message}");
    return SelectionResolver.ExitError;
}

return 0;