using System;
using System.Reflection;
using System.Collections.Generic;

public class TestDriver {

	static public int RunTests (Type type, string[] args) {
		int failed = 0, ran = 0;
		int result, expected, elen;
		int i, j, iterations;
		string name;
		MethodInfo[] methods;
		bool do_timings = false;
		bool verbose = false;
		int tms = 0;
		DateTime start, end = DateTime.Now;

		iterations = 1;

		List<string> new_args = new List<string> ();
		if (args != null && args.Length > 0) {
			for (j = 0; j < args.Length; j++) {
				bool found = false;
				if (args [j] == "--time") {
					do_timings = true;
					found = true;
					j ++;
				} else if (args [j] == "--iter") {
					iterations = Int32.Parse (args [j + 1]);
					j += 2;
					found = true;
				} else if ((args [j] == "-v") || (args [j] == "--verbose")) {
					verbose = true;
					found = true;
				} else {
					new_args.Add (args [j]);
				}
			}
		}
		methods = type.GetMethods (BindingFlags.Public|BindingFlags.NonPublic|BindingFlags.Static);
		for (int iter = 0; iter < iterations; ++iter) {
			for (i = 0; i < methods.Length; ++i) {
				name = methods [i].Name;
				if (!name.StartsWith ("test_"))
					continue;
				if (new_args.Count > 0) {
					bool found = false;
					for (j = 0; j < new_args.Count; j++) {
						if (name.EndsWith (new_args [j])) {
							found = true;
							break;
						}
					}
					if (!found)
						continue;
				}
				for (j = 5; j < name.Length; ++j)
					if (!Char.IsDigit (name [j]))
						break;
				if (verbose)
					Console.WriteLine ("Running '{0}' ...", name);
				expected = Int32.Parse (name.Substring (5, j - 5));
				start = DateTime.Now;
				result = (int)methods [i].Invoke (null, null);
				if (do_timings) {
					end = DateTime.Now;
					long tdiff = end.Ticks - start.Ticks;
					int mdiff = (int)tdiff/10000;
					tms += mdiff;
					Console.WriteLine ("{0} took {1} ms", name, mdiff);
				}
				ran++;
				if (result != expected) {
					failed++;
					Console.WriteLine ("{0} failed: got {1}, expected {2}", name, result, expected);
				}
			}
		
			if (do_timings) {
				Console.WriteLine ("Total ms: {0}", tms);
			}
			Console.WriteLine ("Regression tests: {0} ran, {1} failed in {2}", ran, failed, type);
		}

		//Console.WriteLine ("Regression tests: {0} ran, {1} failed in [{2}]{3}", ran, failed, type.Assembly.GetName().Name, type);
		return failed;
	}
	static public int RunTests (Type type) {
		return RunTests (type, null);
	}
}