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package Torello.CSS;

import Torello.Java.Additional.ByRef;

import java.util.Vector;
import java.util.function.Consumer;

@Torello.JavaDoc.JDHeaderBackgroundImg(EmbedTagFileID="CSS_TOK")
public class Dimension extends Num
    implements CharSequence, java.io.Serializable, Comparable<CharSequence>
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID> */
    protected static final long serialVersionUID = 1;


    // ********************************************************************************************
    // ********************************************************************************************
    // Public & Final Fields
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * The text / {@code String} that was appended to the end of the number that begin this
     * {@code Dimension}-Token
     */
    public final String dimension;


    // ********************************************************************************************
    // ********************************************************************************************
    // Private Constructor, API "is" and "if" Methods
    // ********************************************************************************************
    // ********************************************************************************************


    Dimension(
            final int[]     css,
            final int       sPos,
            final int       ePos,
            final Num       n,
            final String    dimension
        )
    {
        super(css, sPos, ePos, n);
        this.dimension = dimension;
    }

    @Override 
    public final boolean isDimension() { return true; }

    @Override
    public final Dimension ifDimension() { return this; }


    // ********************************************************************************************
    // ********************************************************************************************
    // User's Constructor: a static "build" method
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * <EMBED CLASS=defs DATA-TOK=Dimension DATA-P=dimensionStr>
     * <EMBED CLASS='external-html' DATA-FILE-ID=BUILD_DESC>
     * @param dimensionStr <EMBED CLASS='external-html' DATA-FILE-ID=BUILD_PARAM>
     * @return <EMBED CLASS='external-html' DATA-FILE-ID=BUILD_RET>
     * @throws TokenizeException <EMBED CLASS='external-html' DATA-FILE-ID=BUILD_TOK_EX>
     */
    public static Dimension build(final String dimensionStr)
    {
        CSSToken ret = CSSToken.build(dimensionStr, INPUT_CHECKER, Num::consume);

        if (ret instanceof Dimension) return (Dimension) ret;

        throw new TokenizeException(
            "Your String could not be converted to a Dimension-Instance.  The Number Parser " +
            "has returned an instance of class '" + ret.getClass().getSimpleName() + "' instead."
        );
    }

    private static final CSSToken.InputChecker INPUT_CHECKER = (int[] css) ->
    {
        if (css.length < 2) throw new TokenizeException(Dimension.class);

        if (! Num.is(css, 0)) throw new TokenizeException
            ("String-text beginning does not constitute a valid CSS Number-Token");
    };


    // ********************************************************************************************
    // ********************************************************************************************
    // CONSUME
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * This is a tokenizer method which <B>"consumes"</B> the next Dimension-Token from the
     * input Code-Point Array.
     * 
     * <EMBED CLASS=defs DATA-TOK=Dimension DATA-URL=dimension-token-diagram DATA-OP=Consume>
     * <EMBED CLASS=external-html DATA-FILE-ID=COPIED_CSS_WG_RR>
     * <EMBED CLASS=external-html DATA-FILE-ID=COMMENT_SVG>
     */
    protected static void consume(
            final int[]                 css,
            final ByRef<Integer>        POS,
            final Consumer<CSSToken>    returnParsedToken,
            final int                   identifierStartPos,
            final Num                   num
        )
    {
        /*
        Please, be merciful, this isn't as fun and as exciting as it looks on first-glance.  These
        System.out's are for debugging, and to make this parser more clear when running test code.
        My Test-Code Directory is very, very big and has tests for a lot of things in Java-HTML.
        It helps TO NO END when debugging code.

        These PrintF's were all written while debugging the Torello.CSS Package
        All of the "Edge Cases" are difficult to find until you run tests on all of your Edge-Cases

        System.out.println(
            "Dimension.consume:\n" + 
            "\tPOS.f:                      " + POS.f + '\n' +
            "\tcss[POS.f]:                 " + '\'' + ((char) css[POS.f]) + "'\n" +
            "\tidentifierStartPos:         " + identifierStartPos + '\n' +
            "\tcss[identifierStartPos]:    " + '\'' + ((char) css[identifierStartPos]) + "'\n" +
            "\tnum.integerOrNumber:        " + num.integerOrNumber + "\n" +
            "\tnum.signChar:               " + '\'' + num.signChar + "'\n"  +
            "\tnum.toString():             " + '"' + num.toString() + "\"\n" +
            "\tnum.number.toString():      " + '"' + num.number.toString() + "\"\n" +
            "\tnum.number.intValue():      " + num.number.intValue() + "\n" +
            "\tnum.number.floatValue():    " + num.number.floatValue()
        );
        */

        // Create a <dimension-token> with the same value, type flag, and sign character as
        // number, and a unit set initially to the empty string.
        // 
        // Consume an ident sequence.

        final ByRef<String> identifier = new ByRef<>();

        // Consume an Identifier
        final int identifierEndPos =
            Identifier.consumeIdentSequence(css, identifierStartPos, identifier);

        /*
        System.out.println(
            "\tidentifier.f:               " + identifier.f + '\n' +
            "\tidentifierEndPos:           " + identifierEndPos + '\n' +
            "\tcss[identifierEndPos]:      " + ((identifierEndPos < css.length)
                ? ((char) css[identifierEndPos])
                : ((char) 0))
        );
        */

        // Set the <dimension-token>’s unit to the returned ident-sequence value
        // Return the <dimension-token>.

        returnParsedToken.accept(new Dimension(css, POS.f, identifierEndPos, num, identifier.f));
        POS.f = identifierEndPos;
    }
}