package scpc.model.support;

import java.util.regex.Pattern;
import javax.script.ScriptException;
import scpc.model.IChainRule;
import scpc.model.IRule;
import scpc.model.SingleItem;

/**
 * A formula evaluator to help analysis.
 * <br>公式解譯工具
 *
 * @author Kent Yeh
 * @param <T> type of real cart item.
 */
public abstract class EvalHelper<T> {

    protected static final Pattern JS_NAME_LOCATOR = 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    protected static final Pattern JS_NAME_VALIDATOR = 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    public EvalHelper<T> bindVaribles(IRule<T> rule) {
        return bindVaribles(rule, null);
    }

    /**
     * Check a variable name is a qualified javascript name.
     * <br>檢查變數是否為合格的JavaScript命名
     *
     * @param javaScriptVVariableName the vaiable name
     * @return javaScriptVVariableName
     * @throws ScriptException Exception prone when a variable name is not
     * qualified.
     */
    public static String validJSVarName(String javaScriptVVariableName) throws ScriptException {
        if (!JS_NAME_VALIDATOR.matcher(javaScriptVVariableName).matches()) {
            throw new ScriptException("\"" + javaScriptVVariableName + "\" is not a valid JavaScript Name.");
        } else {
            return javaScriptVVariableName;
        }
    }

    /**
     * Bind rule and item into evaluation context.
     * <br>將促販規則與商品綁定到後評估的環境
     *
     * @param rule
     * @param item
     * @return this evaluator.
     */
    public EvalHelper<T> bindVaribles(IRule<T> rule, SingleItem<T> item) {
        purgeBind();
        IChainRule<T> prule = rule == null ? null : rule.getPrevious();
        String rpfx = "";
        while (prule != null) {
            rpfx += getPreviousRulePrefix();
            bindVarValue(String.format("%s%s", rpfx, getVarContainsCount()), prule.getContainsCount());
            bindVarValue(String.format("%s%s", rpfx, getVarSumOfContainsRegularPrice()), prule.getSumOfContainsRegularPrice().doubleValue());
            bindVarValue(String.format("%s%s", rpfx, getVarSumOfContainsSalePrice()), prule.getSumOfContainsSalePrice().doubleValue());
            bindVarValue(String.format("%s%s", rpfx, getVarSumOfSerialRegularPrice()), prule.getSumOfSerialRegularPrice().doubleValue());
            bindVarValue(String.format("%s%s", rpfx, getVarSumOfSerialSalePrice()), prule.getSumOfSerialSalePrice().doubleValue());
            prule = prule.getPrevious();
        }
        if (item != null) {
            bindVarValue(String.format("%s", getVarSalePrice()), item.getSalePrice());
            bindVarValue(String.format("%s", getVarRegularPrice()), item.getRegularPrice());
        }
        if (rule != null) {
            bindVarValue(String.format("%s", getVarContainsCount()), rule.getContainsCount());
            bindVarValue(String.format("%s", getVarSerialNum()), rule.getSerialNum());
            bindVarValue(String.format("%s", getVarSumOfContainsRegularPrice()), rule.getSumOfContainsRegularPrice().doubleValue());
            bindVarValue(String.format("%s", getVarSumOfContainsSalePrice()), rule.getSumOfContainsSalePrice().doubleValue());
            bindVarValue(String.format("%s", getVarSumOfSerialRegularPrice()), rule.getSumOfSerialRegularPrice().doubleValue());
            bindVarValue(String.format("%s", getVarSumOfSerialSalePrice()), rule.getSumOfSerialSalePrice().doubleValue());
        }
        return this;
    }

    /**
     * Check all variables name are qualified javascript name.
     * <br>查查所有變數是都是合格的Java Script變數
     *
     * @throws ScriptException Exception prone when any one variable name is not
     * qualified.
     */
    public void validateJSVariable() throws ScriptException {
        validJSVarName(getVarSalePrice());
        validJSVarName(getVarRegularPrice());
        validJSVarName(getVarSerialNum());
        validJSVarName(getVarContainsCount());
        validJSVarName(getVarSumOfContainsRegularPrice());
        validJSVarName(getVarSumOfContainsSalePrice());
        validJSVarName(getVarSumOfSerialRegularPrice());
        validJSVarName(getVarSumOfSerialSalePrice());
    }

    /**
     * A prefix string add on comman variable to represent a previous rule's
     * variable.
     * <br>變數前綴以表示該變數為前連規則之變數
     *
     * @return
     */
    public abstract String getPreviousRulePrefix();

    /**
     * Variable name of sale price.
     * <br>售價的變數名稱
     *
     * @return
     */
    public abstract String getVarSalePrice();

    /**
     * Variable name of regular price.
     * <br>原價的變數名稱
     *
     * @return
     */
    public abstract String getVarRegularPrice();

    /**
     * Variable name of which represent the sequence of the same applicable
     * items.
     * <br>同品項的序號
     *
     * @return
     */
    public abstract String getVarSerialNum();

    /**
     * Variable name of which represent the number of items that could
     * applicable to this rule.
     * <br>符合此規則的品項數量的變數
     *
     * @return
     */
    public abstract String getVarContainsCount();

    /**
     * Variable name of which represent the summary regular price of applicable
     * items.
     * <br>符合此規則的品項原價小計的變數
     *
     * @return
     */
    public abstract String getVarSumOfContainsRegularPrice();

    /**
     * Variable name of which represent the summary sale price of applicable
     * items.
     * <br>符合此規則的品項售價小計的變數
     *
     * @return
     */
    public abstract String getVarSumOfContainsSalePrice();

    /**
     * Variable name of which represent the summary regular price of the same
     * applicable items.
     * <br>符合此規則的同品項原價小計的變數
     *
     * @return
     */
    public abstract String getVarSumOfSerialRegularPrice();

    /**
     * Variable name of which represent the summary sale price of the same
     * applicable items.
     * <br>符合此規則的同品項售價小計的變數
     *
     * @return
     */
    public abstract String getVarSumOfSerialSalePrice();

    /**
     * Bind variable with value into context.
     * <br>評估的環境中綁定變數與值
     *
     * @param variable
     * @param value
     * @return
     */
    public abstract EvalHelper<T> bindVarValue(String variable, Object value);

    /**
     * Clear all binding variable in context.
     * <br>清除評估環境中所有的變數
     */
    protected abstract void purgeBind();

    /**
     * Evaluate formula as numeric or boolean.
     * <br>將公式估值為數值或布林
     *
     * @param <R> return type
     * @param formula
     * @return
     * @throws ScriptException Exception prone when a formula is not qualified.
     */
    public abstract <R> R eval(String formula) throws ScriptException;

}