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package express.http;

import java.time.Instant;
import java.util.HashMap;

/**
 * @author Simon Reinisch
 * An CookieFactory to parse an string which represents an cookie.
 */
public final class CookieFactory {

    private CookieFactory() {}

    /**
     * Parse an cookie string.
     *
     * @param cookieString The cookie as string.
     * @return The parsed cookie as object.
     */
    public static Cookie fromString(String cookieString) {
        Cookie cookie = null;
        char[] chars = cookieString.toCharArray();

        StringBuilder key = new StringBuilder();
        StringBuilder val = new StringBuilder();
        boolean swap = false;

        for (char c : chars) {

            if (c == '=') {
                swap = true;
            } else if (c == ';') {

                cookie = addField(cookie, key.toString(), val.toString());

                key.setLength(0);
                val.setLength(0);
                swap = false;
            } else if (swap) {
                val.append(c);
            } else {
                key.append(c);
            }
        }

        cookie = addField(cookie, key.toString(), val.toString());
        return cookie;
    }

    /**
     * Parse an list of strings which represents an cookie.
     *
     * @param stringCookies The list with string cookies.
     * @return A list with the parsed cookies.
     */
    public static HashMap fromStrings(String[] stringCookies) {
        HashMap cookies = new HashMap<>();

        if (stringCookies == null || stringCookies.length == 0) {
            return cookies;
        }

        for (String s : stringCookies) {
            Cookie cookie = fromString(s);

            if (cookie != null) {
                cookies.put(cookie.getName(), cookie);
            }
        }

        return cookies;
    }

    private static Cookie addField(Cookie cookie, String key, String value) {
        key = key.trim();


        if (cookie == null) {
            cookie = new Cookie(key, value);
        } else if (key.equalsIgnoreCase("Path")) {
            cookie.setPath(value);
        } else if (key.equalsIgnoreCase("Domain")) {
            cookie.setDomain(value);
        } else if (key.equalsIgnoreCase("Expire")) {
            cookie.setExpire(Instant.parse(value));
        } else if (key.equalsIgnoreCase("Max-Age")) {

            if (isInteger(value)) {
                cookie.setMaxAge(Long.parseLong(value));
            }

        } else if (key.equalsIgnoreCase("SameSite")) {

            SameSite sameSite = value.equalsIgnoreCase("LAX") ? SameSite.LAX : SameSite.STRICT;
            cookie.setSameSite(sameSite);

        } else if (key.equalsIgnoreCase("Secure")) {
            cookie.setSecure(true);
        } else if (key.equalsIgnoreCase("HttpOnly")) {
            cookie.setHttpOnly(true);
        }

        return cookie;
    }

    private static boolean isInteger(String str) {
        char[] chars = str.toCharArray();

        for (char c : chars) {
            if (c < 48 || c > 57) return false;
        }

        return true;
    }
}