//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio University, Beihang, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

/**
 * @spec https://www.w3.org/TR/2024/WD-css-text-4-20240219/#propdef-text-indent
 */
public class CssTextIndent extends org.w3c.css.properties.css.CssTextIndent {

    public static final CssIdent hanging, each_line;

    static {
        hanging = CssIdent.getIdent("hanging");
        each_line = CssIdent.getIdent("each-line");
    }

    /**
     * Create a new CssTextIndent
     */
    public CssTextIndent() {
        value = initial;
    }

    /**
     * Creates a new CssTextIndent
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException Expressions are incorrect
     */
    public CssTextIndent(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 3) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;

        CssValue sizeVal = null;
        CssValue hangVal = null;
        CssValue eachVal = null;

        value = null;

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();
            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getLength();
                case CssTypes.CSS_LENGTH:
                case CssTypes.CSS_PERCENTAGE:
                    if (sizeVal != null) {
                        throw new InvalidParamException("value",
                                val.toString(), getPropertyName(), ac);
                    }
                    sizeVal = val;
                    // we check that we are at the beginning or at the end
                    // as it can't happen between two idents.
                    if ((hangVal != null || eachVal != null) && expression.getRemainingCount() > 1) {
                        // TODO specific error (can't happen between...)
                        throw new InvalidParamException("value",
                                val.toString(), getPropertyName(), ac);
                    }
                    break;
                case CssTypes.CSS_IDENT:
                    CssIdent ident = val.getIdent();
                    if (CssIdent.isCssWide(ident)) {
                        value = val;
                        if (check && expression.getCount() > 1) {
                            throw new InvalidParamException("unrecognize", ac);
                        }
                        break;
                    }
                    if (hangVal == null && hanging.equals(ident)) {
                        hangVal = val;
                        break;
                    }
                    if (eachVal == null && each_line.equals(ident)) {
                        eachVal = val;
                        break;
                    }
                default:
                    throw new InvalidParamException("value",
                            expression.getValue().toString(),
                            getPropertyName(), ac);
            }
            expression.next();
        }
        // sanity check, we must have a length or percentage
        if (value == null) {
            if (sizeVal == null) {
                throw new InvalidParamException("value",
                        expression.toString(), getPropertyName(), ac);
            }
            if (expression.getCount() == 1) {
                value = sizeVal;
            } else {
                ArrayList<CssValue> v = new ArrayList<>(4);
                v.add(sizeVal);
                if (hangVal != null) {
                    v.add(hangVal);
                }
                if (eachVal != null) {
                    v.add(eachVal);
                }
                value = new CssValueList(v);
            }
        }
    }

    public CssTextIndent(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

}