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package spring.turbo.util;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.datetime.DateFormatter;
import org.springframework.lang.Nullable;

import java.text.ParseException;
import java.util.Collection;
import java.util.Date;
import java.util.Locale;

/**
 * @author 应卓
 * @since 1.0.10
 */
public final class DateParseUtils {

    public static final String PRIMARY_PATTERN = "yyyy-MM-dd";

    public static final String[] BACKUP_PATTERNS = new String[]{
            "yyyy-MM-dd HH:mm:ss",
            "yyyy-MM-dd HH:mm:ss.SSS",
            "yyyy-MM-dd",
            "yyyy-MM-dd'T'HH:mm:ss",
            "yyyy-MM-dd'T'HH:mm:ss.SSS",
            "yyyy-MM-dd",
            "yyyy/MM/dd HH:mm:ss",
            "yyyy/MM/dd HH:mm:ss.SSS",
            "yyyy/MM/dd",
            "yyyy-M-d HH:mm:ss",
            "yyyy-M-d HH:mm:ss.SSS",
            "yyyy-M-d",
            "yyyy/M/d HH:mm:ss",
            "yyyy/M/d HH:mm:ss.SSS",
            "yyyy/M/d",
            "yyyy",
            "yyyy-MM",
            "yyyy-M",
    };

    /**
     * 私有构造方法
     */
    private DateParseUtils() {
        super();
    }

    public static Date parse(String string, String pattern, String... fallbackPatterns) {
        Asserts.notNull(string);
        Asserts.notNull(pattern);

        try {
            final DateFormatter formatter = new DateFormatter();
            formatter.setIso(DateTimeFormat.ISO.NONE);
            formatter.setPattern(pattern);
            formatter.setFallbackPatterns(fallbackPatterns);
            return formatter.parse(string, Locale.getDefault());
        } catch (ParseException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }

    public static Date parse(String string, String pattern, @Nullable Collection fallbackPatterns) {
        if (fallbackPatterns != null && !fallbackPatterns.isEmpty()) {
            return parse(string, pattern, fallbackPatterns.toArray(new String[0]));
        } else {
            return parse(string, pattern);
        }
    }

    public static Date parseWildly(String string) {
        return parse(string, PRIMARY_PATTERN, BACKUP_PATTERNS);
    }

}