package main

import "testing"

// spec:26174-planctl-context-tokens/R6.3+D§3.3
// Synthetic stat line: benign comm, starttime=12345.
func TestParseStatStartTime_simple(t *testing.T) {
	// 22 fields: pid (comm) state ppid pgrp session tty_nr tpgid flags minflt cminflt majflt cmajflt utime stime cutime cstime priority nice num_threads itrealvalue starttime
	line := "1234 (bash) S 1 1 1 0 -1 4194304 100 0 0 0 1 2 0 0 20 0 1 0 12345 ...\n"
	n, err := parseStatStartTime(line)
	if err != nil {
		t.Fatalf("parseStatStartTime: %v", err)
	}
	if n != 12345 {
		t.Errorf("got %d, want 12345", n)
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
// comm containing spaces and parens: the "LAST ')'" parse strategy must still
// find the field-22 starttime correctly.
func TestParseStatStartTime_commWithParensAndSpaces(t *testing.T) {
	line := "1234 (my (weird) program) S 1 1 1 0 -1 4194304 100 0 0 0 1 2 0 0 20 0 1 0 99999 ...\n"
	n, err := parseStatStartTime(line)
	if err != nil {
		t.Fatalf("parseStatStartTime: %v", err)
	}
	if n != 99999 {
		t.Errorf("got %d, want 99999", n)
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
func TestParseStatStartTime_noParenError(t *testing.T) {
	if _, err := parseStatStartTime("not a stat line"); err == nil {
		t.Fatal("expected error for missing ')'")
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
func TestParseStatStartTime_tooFewFields(t *testing.T) {
	if _, err := parseStatStartTime("1 (x) S 1 1"); err == nil {
		t.Fatal("expected error for too few fields")
	}
}

// spec:26174-planctl-context-tokens/R6.3+D§3.3
func TestParseStatStartTime_nonNumeric(t *testing.T) {
	// 20 tail fields with a non-numeric in starttime slot.
	tail := "S 1 1 1 0 -1 4194304 100 0 0 0 1 2 0 0 20 0 1 0 NOPE"
	if _, err := parseStatStartTime("1 (x) " + tail); err == nil {
		t.Fatal("expected error for non-numeric starttime")
	}
}