using uCalcSoftware;

var uc = new uCalc();
// 1. Define variables to hold the metrics
uc.DefineVariable("request_count = 0");
uc.DefineVariable("error_count = 0");
uc.DefineVariable("total_response_time = 0.0");
uc.DefineVariable("max_response_time = 0.0");

// 2. Create the transformer and define the rule
using (var t = new uCalc.Transformer(uc)) {
   var pattern = "{@String:request} {@Number:status} {@Number:time}ms";

   // 3. The replacement string uses @Exec for side-effects (updating variables)
   var replacement = """

{@Exec: request_count++}
{@Exec: total_response_time = total_response_time + Double(time)}
{@Exec: max_response_time = Max(max_response_time, Double(time))}
{@Exec: iif(Double(status) >= 400, error_count++, 0)}

""";

   t.FromTo(pattern, replacement);

   // 4. Define the multi-line log data
   var logText = """

2024-10-26 10:00:05 INFO    192.168.1.10   "GET /api/users HTTP/1.1" 200 15ms
2024-10-26 10:00:06 INFO    192.168.1.15   "GET /api/products HTTP/1.1" 200 22ms
2024-10-26 10:00:07 ERROR   192.168.1.22   "POST /api/login HTTP/1.1" 500 120ms
2024-10-26 10:00:08 INFO    192.168.1.10   "GET /api/users/1 HTTP/1.1" 200 8ms

""";

   // 5. Run the transformation (the output will be empty as we only use @Exec)
   t.Transform(logText);
}

// 6. Display the final aggregated metrics
Console.WriteLine("--- Log Analysis Summary ---");
Console.WriteLine($"Total Requests: {uc.EvalStr("request_count")}");
Console.WriteLine($"Total Errors: {uc.EvalStr("error_count")}");
Console.WriteLine($"Average Response Time: {uc.EvalStr("total_response_time / request_count")}ms");
Console.WriteLine($"Maximum Response Time: {uc.EvalStr("max_response_time")}ms");