//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2013.
// 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.CssCheckableValue;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssLayerList;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

import static org.w3c.css.values.CssOperator.COMMA;
import static org.w3c.css.values.CssOperator.SPACE;

/**
 * @spec https://www.w3.org/TR/2020/CR-css-speech-1-20200310/#voice-family
 */
public class CssVoiceFamily extends org.w3c.css.properties.css.CssVoiceFamily {

    public static final CssIdent[] genericVoices, age;
    public static final CssIdent preserve;

    static {
        preserve = CssIdent.getIdent("preserve");

        String[] _genericVoices = {"male", "female", "neutral"};
        genericVoices = new CssIdent[_genericVoices.length];
        int i = 0;
        for (String s : _genericVoices) {
            genericVoices[i++] = CssIdent.getIdent(s);
        }

        String[] _age = {"child", "young", "old"};
        age = new CssIdent[_age.length];
        i = 0;
        for (String s : _age) {
            age[i++] = CssIdent.getIdent(s);
        }

    }

    static CssIdent getGenericVoiceName(CssIdent ident) {
        for (CssIdent id : genericVoices) {
            if (id.equals(ident)) {
                return id;
            }
        }
        return null;
    }

    static CssIdent getAge(CssIdent ident) {
        for (CssIdent id : age) {
            if (id.equals(ident)) {
                return id;
            }
        }
        return null;
    }

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

    /**
     * Creates a new CssVoiceFamily
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException Expressions are incorrect
     */
    public CssVoiceFamily(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        ArrayList<CssValue> values = new ArrayList<CssValue>();

        while (!expression.end()) {
            char op = expression.getOperator();
            CssValue val = expression.getValue();
            switch (val.getType()) {
                case CssTypes.CSS_STRING:
                case CssTypes.CSS_IDENT:
                    ArrayList<CssValue> cssValues = new ArrayList<CssValue>();
                    cssValues.add(val);
                    // we add idents if separated by spaces...
                    while (op == SPACE && expression.getRemainingCount() > 1) {
                        expression.next();
                        op = expression.getOperator();
                        val = expression.getValue();
                        int type = val.getType();
                        if (type == CssTypes.CSS_IDENT ||
                                type == CssTypes.CSS_STRING ||
                                type == CssTypes.CSS_NUMBER) {
                            cssValues.add(val);
                        } else {
                            throw new InvalidParamException("value", val,
                                    getPropertyName(), ac);
                        }
                    }
                    checkExpression(ac, values, cssValues, check);
                    break;
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            expression.next();
            if (!expression.end() && (op != COMMA)) {
                throw new InvalidParamException("operator",
                        Character.toString(op), ac);
            }
        }
        value = (values.size() > 1) ? new CssLayerList(values) : values.get(0);
        checkValues(ac, values);
    }

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

    private void checkExpression(ApplContext ac, ArrayList<CssValue> curval,
                                 ArrayList<CssValue> values, boolean check)
            throws InvalidParamException {
        CssIdent ageVal = null;
        CssValue numVal = null;
        CssValue nameVal = null;
        ArrayList<CssValue> identl = null;

        // so we can have a generic voice or a string or an ident list...
        // let's triage things... that will require extra checks (again)
        // at the end *sigh*
        for (CssValue val : values) {
            if (ageVal == null && nameVal == null && val.getType() == CssTypes.CSS_IDENT) {
                ageVal = getAge(val.getIdent());
                if (ageVal != null) {
                    continue;
                }
            }
            if (numVal == null) {
                switch (val.getType()) {
                    case CssTypes.CSS_STRING:
                        if (nameVal != null) {
                            // don't mix string and everything else.
                            throw new InvalidParamException("value", val,
                                    getPropertyName(), ac);
                        }
                        nameVal = val;
                        break;
                    case CssTypes.CSS_IDENT:
                        CssIdent id = val.getIdent();
                        if (CssIdent.isCssWide(id) || preserve.equals(id)) {
                            // FIXME need to do better here
                        }
                        if (nameVal == null) {
                            nameVal = val;
                            identl = new ArrayList<>();
                        }
                        if (identl == null) {
                            // else we got a string before...
                            throw new InvalidParamException("value", val,
                                    getPropertyName(), ac);
                        }
                        identl.add(val);
                        break;
                    case CssTypes.CSS_NUMBER:
                        CssCheckableValue n = val.getCheckableValue();
                        n.checkStrictPositiveness(ac, this);
                        numVal = val;
                        break;
                }
            } else {
                // we can't have things after the number.
                throw new InvalidParamException("value", val,
                        getPropertyName(), ac);
            }
        }
        if (values.size() == 1) {
            // that's the easy one...
            if (nameVal == null) {
                throw new InvalidParamException("value", values.get(0),
                        getPropertyName(), ac);
            }
            if (nameVal.getType() == CssTypes.CSS_IDENT) {
                hasGenericVoiceFamily = (getGenericVoiceName(nameVal.getIdent()) != null);
            }
            curval.add(nameVal);

        } else {
            // let the fun begin...
            if (numVal != null || ageVal != null) {
                // we must have a generic name...
                // this also checks that we don't have a String.
                if (identl == null || identl.size() != 1) {
                    CssValue v = new CssValueList(values);
                    throw new InvalidParamException("value", v,
                            getPropertyName(), ac);
                }
                // ok so now check that we have a generic value in nameVal
                if ((nameVal.getType() == CssTypes.CSS_IDENT)
                        && (getGenericVoiceName(nameVal.getIdent()) == null)) {
                    throw new InvalidParamException("value", nameVal,
                            getPropertyName(), ac);
                }
            } else {
                if (identl != null) {
                    if (identl.size() > 1) {
                        ac.getFrame().addWarning("with-space", 1);
                    } else {
                        hasGenericVoiceFamily = (getGenericVoiceName(identl.get(0).getIdent()) != null);
                    }
                }
            }
            // now add the value...
            curval.add(new CssValueList(values));

        }
    }

    // final consistency check

    private void checkValues(ApplContext ac, ArrayList<CssValue> values)
            throws InvalidParamException {
        // we need to check that we don't have 'inherit' in multiple values
        if (values.size() > 1) {
            for (CssValue val : values) {
                if ((inherit == val) || (preserve == val)) {
                    throw new InvalidParamException("unrecognize", ac);
                }
            }
        }
        if (inherit != value && preserve != value && !hasGenericVoiceFamily) {
            ac.getFrame().addWarning("no-generic-family", getPropertyName());
        }
    }
}