package com.android.dialer.helpdesk.command;

import static com.android.dialer.helpdesk.command.CommandGate.CallPhase.ACTIVE;
import static com.android.dialer.helpdesk.command.CommandGate.CallPhase.ENDED;
import static com.android.dialer.helpdesk.command.CommandGate.CallPhase.RINGING;
import static com.android.dialer.helpdesk.command.CommandGate.Decision.APPLY;
import static com.android.dialer.helpdesk.command.CommandGate.Decision.DROP_BAD_ARG;
import static com.android.dialer.helpdesk.command.CommandGate.Decision.DROP_DUPLICATE;
import static com.android.dialer.helpdesk.command.CommandGate.Decision.DROP_STALE;
import static com.android.dialer.helpdesk.command.CommandGate.Decision.DROP_UNKNOWN_VERB;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Standalone off-device test for {@link CommandGate}. Modes:
 *  - default: decision assertions.
 *  - "verbs": print the sorted verb set (harness diffs vs Helpdesk::COMMAND_VERBS).
 *  - "dtmf":  read args from stdin, print valid/invalid (harness diffs vs valid_dtmf?).
 */
public class CommandGateTest {
  static int pass = 0, fail = 0;
  static void eq(Object got, Object want, String d) {
    if (got == null ? want == null : got.equals(want)) { pass++; System.out.println("  ok  " + d); }
    else { fail++; System.out.println("  FAIL " + d + "  (got: " + got + ")"); }
  }

  public static void main(String[] args) throws Exception {
    if (args.length > 0 && args[0].equals("verbs")) {
      List<String> v = new ArrayList<>(CommandGate.VERBS);
      Collections.sort(v);
      for (String s : v) System.out.println(s);
      return;
    }
    if (args.length > 0 && args[0].equals("dtmf")) {
      BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
      String line;
      while ((line = r.readLine()) != null) {
        System.out.println(CommandGate.isValidDtmf(line) ? "valid" : "invalid");
      }
      return;
    }
    CommandGate g = new CommandGate();
    eq(g.decide("1", "answer", null, RINGING), APPLY, "answer on ringing applies");
    eq(g.decide("1", "answer", null, RINGING), DROP_DUPLICATE, "same id dropped (idempotent)");
    eq(g.decide("2", "answer", null, ENDED), DROP_STALE, "answer on ended dropped (monotonic)");
    eq(g.decide("3", "explode", null, RINGING), DROP_UNKNOWN_VERB, "unknown verb dropped");
    eq(g.decide("4", "dtmf", "5", ACTIVE), APPLY, "valid dtmf applies");
    eq(g.decide("5", "dtmf", "X", ACTIVE), DROP_BAD_ARG, "bad dtmf arg dropped");
    eq(g.decide("6", "dtmf", "#", ACTIVE), APPLY, "'#' is a valid dtmf");
    eq(g.decide("7", "mute", null, ACTIVE), APPLY, "mute applies mid-call");
    eq(g.decide("8", "hangup", null, ACTIVE), APPLY, "hangup applies mid-call");
    eq(g.decide("9", "route", "bluetooth", ACTIVE), APPLY, "route applies");
    // a bad command is never recorded as seen -> a corrected retry with the same id still evaluates
    eq(g.decide("3", "answer", null, RINGING), APPLY, "id reused after prior unknown-verb still applies");

    // bounded seen set (no unbounded growth over a long-running service) + per-call reset
    CommandGate g2 = new CommandGate();
    for (int i = 0; i < CommandGate.MAX_SEEN + 500; i++) {
      g2.decide("id" + i, "mute", null, ACTIVE);
    }
    eq(g2.seenSize() <= CommandGate.MAX_SEEN, true, "seen set bounded at MAX_SEEN (no leak)");
    g2.reset();
    eq(g2.seenSize(), 0, "reset() clears dedup memory (per-call scope)");
    eq(g2.decide("id0", "mute", null, ACTIVE), APPLY, "id re-applies after reset()");
    System.out.println("\n" + pass + " passed, " + fail + " failed");
    System.exit(fail == 0 ? 0 : 1);
  }
}