package dell55AAData;

public class Dell55AA01Parser {
    // ЭÒé³£Á¿
    private static final String EXPECTED_HEADER = "55AA01"; // ЭÒéÍ·
    private static final int MIN_LENGTH = 42; // ×îС³¤¶È(21×Ö½Ú*2×Ö·û)
    private static final ThreadLocal<ParseResult> RESULT_CACHE = 
        ThreadLocal.withInitial(ParseResult::new);

    // ½âÎö½á¹ûÀà
    public static class ParseResult {
        public int sequenceNum;   // ÐòÁкÅ
        public String tagId;      // ±êÇ©ID(4×Ö½ÚÊ®Áù½øÖÆ)
        public String anchorId;   // êµãID(4×Ö½ÚÊ®Áù½øÖÆ)
        public int distance;      // ¾àÀë(ºÁÃ×)
        public int power;         // µçÁ¿(0-100)
        public boolean buttonPressed; // °´Å¥×´Ì¬
        
        public void reset() {
            sequenceNum = 0;
            tagId = "";
            anchorId = "";
            distance = 0;
            power = 0;
            buttonPressed = false;
        }
    }

    /**
     * ½âÎö55AA01ЭÒéÊý¾Ý
     * @param message Ê®Áù½øÖÆ×Ö·û´®
     * @return ½âÎö½á¹û(ʧ°Ü·µ»Ønull)
     */
    public static ParseResult parse(String message) {
        // ²ÎÊý¼ì²é
        if (message == null || message.length() < MIN_LENGTH) {
            return null;
        }
        
        // ЭÒéÍ·ÑéÖ¤ (55AA01)
        for (int i = 0; i < 6; i++) {
            if (message.charAt(i) != EXPECTED_HEADER.charAt(i)) {
                return null;
            }
        }
        
        // »ñÈ¡Ï̱߳¾µØ×ÊÔ´
        ParseResult result = RESULT_CACHE.get();
        result.reset();
        char[] chars = HexUtils.getThreadLocalBuffer();
        message.getChars(0, Math.min(message.length(), chars.length), chars, 0);
        
        // ½âÎöÐòÁкŠ(λÖÃ8-9)
        result.sequenceNum = HexUtils.fastHexToByte(chars[8], chars[9]);
        
        // ½âÎö±êÇ©ID (λÖÃ10-13, С¶ËÐò)
        result.tagId = new String(new char[] {
            chars[12], chars[13], // ¸ßλ
            chars[10], chars[11]   // µÍλ
        });
        
        // ½âÎöêµãID (λÖÃ14-17, С¶ËÐò)
        result.anchorId = new String(new char[] {
            chars[16], chars[17], // ¸ßλ
            chars[14], chars[15]   // µÍλ
        });
        
        // ½âÎö¾àÀë (λÖÃ18-25, 4×Ö½ÚС¶ËÐòÕûÊý)
        int b0 = HexUtils.fastHexToByte(chars[18], chars[19]); // ×îµÍλ
        int b1 = HexUtils.fastHexToByte(chars[20], chars[21]);
        int b2 = HexUtils.fastHexToByte(chars[22], chars[23]);
        int b3 = HexUtils.fastHexToByte(chars[24], chars[25]); // ×î¸ßλ
        int raw = (b3 << 24) | (b2 << 16) | (b1 << 8) | b0;
        result.distance = raw; // ±£³ÖԭʼÕûÊýÖµ
        
        // ½âÎöµçÁ¿ (λÖÃ26-27)
        result.power = HexUtils.fastHexToByte(chars[26], chars[27]);
        
        // ½âÎö°´Å¥×´Ì¬ (λÖÃ28-29)
        result.buttonPressed = HexUtils.fastHexToByte(chars[28], chars[29]) == 1;
        
        return result;
    }
}