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package external.com.alibaba.fastjson.parser;

import java.lang.reflect.Type;
import java.util.Arrays;

import external.com.alibaba.fastjson.JSONException;
import external.com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;

@SuppressWarnings("rawtypes")
public class EnumDeserializer implements ObjectDeserializer {

    private final Class enumClass;
    protected final Enum[] enums;

    protected final Enum[] ordinalEnums;

    protected long[] enumNameHashCodes;

    public EnumDeserializer(Class enumClass){
        this.enumClass = enumClass;

        ordinalEnums = (Enum[]) enumClass.getEnumConstants();

        long[] enumNameHashCodes = new long[ordinalEnums.length];
        this.enumNameHashCodes = new long[ordinalEnums.length];
        for (int i = 0; i < ordinalEnums.length; ++i) {
            String name = ordinalEnums[i].name();
            long hash = 0xcbf29ce484222325L;
            for (int j = 0; j < name.length(); ++j) {
                char ch = name.charAt(j);
                hash ^= ch;
                hash *= 0x100000001b3L;
            }
            enumNameHashCodes[i] = hash;
            this.enumNameHashCodes[i] = hash;
        }

        Arrays.sort(this.enumNameHashCodes);

        this.enums = new Enum[ordinalEnums.length];
        for (int i = 0; i < this.enumNameHashCodes.length; ++i) {
            for (int j = 0; j < enumNameHashCodes.length; ++j) {
                if (this.enumNameHashCodes[i] == enumNameHashCodes[j]) {
                    this.enums[i] = ordinalEnums[j];
                    break;
                }
            }
        }
    }

    @SuppressWarnings("unchecked")
    public  T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
        try {
            Object value;
            final JSONLexer lexer = parser.lexer;
            final int token = lexer.token;
            if (token == JSONToken.LITERAL_INT) {
                int intValue = lexer.intValue();
                lexer.nextToken(JSONToken.COMMA);

                if (intValue < 0 || intValue > ordinalEnums.length) {
                    throw new JSONException("parse enum " + enumClass.getName() + " error, value : " + intValue);
                }

                return (T) ordinalEnums[intValue];
            } else if (token == JSONToken.LITERAL_STRING) {
                String name = lexer.stringVal();
                lexer.nextToken(JSONToken.COMMA);

                if (name.length() == 0) {
                    return (T) null;
                }

                long hash = 0xcbf29ce484222325L;
                for (int j = 0; j < name.length(); ++j) {
                    char ch = name.charAt(j);
                    hash ^= ch;
                    hash *= 0x100000001b3L;
                }

                int enumIndex = Arrays.binarySearch(this.enumNameHashCodes, hash);
                if (enumIndex < 0) {
                    return null;
                }

                return (T) enums[enumIndex];
            } else if (token == JSONToken.NULL) {
                value = null;
                lexer.nextToken(JSONToken.COMMA);

                return null;
            } else {
                value = parser.parse();
            }

            throw new JSONException("parse enum " + enumClass.getName() + " error, value : " + value);
        } catch (JSONException e) {
            throw e;
        } catch (Exception e) {
            throw new JSONException(e.getMessage(), e);
        }
    }
}