package sqlancer.sqlite3;

import sqlancer.Randomly;

public final class SQLite3SpecialStringGenerator {

private SQLite3SpecialStringGenerator() {

}

private enum Options {

TIME_DATE_REGEX, NOW, DATE_TIME, TIME_MODIFIER, FLOAT

}

public static String generate() {

StringBuilder sb = new StringBuilder();

switch (Randomly.fromOptions(Options.values())) {

case TIME_DATE_REGEX: // https://www.sqlite.org/lang_datefunc.html

return Randomly.fromOptions("%d", "%f", "%H", "%j", "%J", "%m", "%M", "%s", "%S", "%w", "%W", "%Y", "%%");

case NOW:

return "now";

case DATE_TIME:

long notCachedInteger = Randomly.getNotCachedInteger(1, 10);

for (int i = 0; i < notCachedInteger; i++) {

if (Randomly.getBoolean()) {

sb.append(Randomly.getNonCachedInteger());

} else {

sb.append(Randomly.getNotCachedInteger(0, 2000));

}

sb.append(Randomly.fromOptions(":", "-", " ", "T"));

}

return sb.toString();

case TIME_MODIFIER:

sb.append(Randomly.fromOptions("days", "hours", "minutes", "seconds", "months", "years", "start of month",

"start of year", "start of day", "weekday", "unixepoch", "utc"));

return sb.toString();

case FLOAT:

return Randomly.fromOptions("NaN", "Infinity", "-Infinity", "1e500000", "1-500000");

default:

throw new AssertionError();

}

}

}