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package org.pkl.thirdparty.truffle.api.strings;

import org.pkl.thirdparty.truffle.api.CompilerDirectives.CompilationFinal;
import org.pkl.thirdparty.truffle.api.TruffleSafepoint;
import org.pkl.thirdparty.truffle.api.nodes.LoopNode;
import org.pkl.thirdparty.truffle.api.nodes.Node;
import org.pkl.thirdparty.truffle.api.strings.TruffleString.Encoding;

final class TStringConstants {

    static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
    static final int MAX_ARRAY_SIZE_S1 = MAX_ARRAY_SIZE >> 1;
    static final int MAX_ARRAY_SIZE_S2 = MAX_ARRAY_SIZE >> 2;

    @CompilationFinal(dimensions = 1) static final byte[] EMPTY_BYTES = new byte[0];
    @CompilationFinal(dimensions = 2) private static final byte[][] SINGLE_BYTE_ARRAYS = new byte[256][1];
    @CompilationFinal(dimensions = 1) private static final byte[] INFINITY_BYTES = {'I', 'n', 'f', 'i', 'n', 'i', 't', 'y'};
    @CompilationFinal(dimensions = 1) private static final byte[] NaN_BYTES = {'N', 'a', 'N'};

    private static final TruffleString INFINITY = TruffleString.createConstant(INFINITY_BYTES, INFINITY_BYTES.length, 0, Encoding.US_ASCII, INFINITY_BYTES.length, TSCodeRange.get7Bit());
    private static final TruffleString NaN = TruffleString.createConstant(NaN_BYTES, NaN_BYTES.length, 0, Encoding.US_ASCII, NaN_BYTES.length, TSCodeRange.get7Bit());
    @CompilationFinal(dimensions = 2) private static final TruffleString[][] SINGLE_BYTE = new TruffleString[Encodings.SUPPORTED_ENCODINGS_MAX_NUM][];

    /**
     * Minimum combined length of two strings for lazy concatenation.
     */
    static final int LAZY_CONCAT_MIN_LENGTH = 40;

    static {
        for (int i = Encodings.SUPPORTED_ENCODINGS_MIN_NUM; i < Encodings.SUPPORTED_ENCODINGS_MAX_NUM; i++) {
            SINGLE_BYTE[i] = new TruffleString[256];
        }
        for (int i = 0; i < 128; i++) {
            SINGLE_BYTE_ARRAYS[i][0] = (byte) i;
            SINGLE_BYTE[Encodings.SUPPORTED_ENCODINGS_MIN_NUM][i] = TruffleString.createConstant(SINGLE_BYTE_ARRAYS[i], 1, 0, Encoding.US_ASCII, 1, TSCodeRange.get7Bit());
            for (int j = Encodings.SUPPORTED_ENCODINGS_MIN_NUM + 1; j < Encodings.SUPPORTED_ENCODINGS_MAX_NUM; j++) {
                SINGLE_BYTE[j][i] = SINGLE_BYTE[Encodings.SUPPORTED_ENCODINGS_MIN_NUM][i];
            }
        }

        for (int i = 128; i < 256; i++) {
            SINGLE_BYTE_ARRAYS[i][0] = (byte) i;
            for (int j = Encodings.SUPPORTED_ENCODINGS_MIN_NUM; j < Encodings.SUPPORTED_ENCODINGS_MAX_NUM; j++) {
                SINGLE_BYTE[j][i] = TruffleString.createConstant(SINGLE_BYTE_ARRAYS[i], 1, 0, Encoding.get(j), 1, nonAsciiCodeRange(Encoding.get(j)));
            }
        }
    }

    private static int nonAsciiCodeRange(Encoding encoding) {
        if (TStringGuards.isAsciiBytesOrLatin1(encoding)) {
            return TSCodeRange.asciiLatinBytesNonAsciiCodeRange(encoding);
        }
        if (TStringGuards.isUTF8(encoding)) {
            return TSCodeRange.getBrokenMultiByte();
        }
        return TSCodeRange.get8Bit();
    }

    static TruffleString getInfinity(int encoding) {
        if (AbstractTruffleString.DEBUG_STRICT_ENCODING_CHECKS) {
            return createAscii(INFINITY_BYTES, Encoding.get(encoding));
        }
        return INFINITY;
    }

    static TruffleString getNaN(int encoding) {
        if (AbstractTruffleString.DEBUG_STRICT_ENCODING_CHECKS) {
            return createAscii(NaN_BYTES, Encoding.get(encoding));
        }
        return NaN;
    }

    static TruffleString getSingleByteAscii(Encoding encoding, int value) {
        if (AbstractTruffleString.DEBUG_STRICT_ENCODING_CHECKS) {
            return createAscii(SINGLE_BYTE_ARRAYS[value], encoding);
        }
        if (TStringGuards.isUnsupportedEncoding(encoding)) {
            return SINGLE_BYTE[Encoding.US_ASCII.id][value];
        }
        return SINGLE_BYTE[encoding.id][value];
    }

    static TruffleString getSingleByte(Encoding encoding, int value) {
        if (AbstractTruffleString.DEBUG_STRICT_ENCODING_CHECKS && value <= 0x7f) {
            return createAscii(SINGLE_BYTE_ARRAYS[value], encoding);
        }
        return SINGLE_BYTE[encoding.id][value];
    }

    private static TruffleString createAscii(byte[] array, Encoding encoding) {
        return TruffleString.createFromByteArray(array, array.length, 0, encoding, array.length, TSCodeRange.getAsciiCodeRange(encoding), true);
    }

    static void truffleSafePointPoll(Node location, int loopCount) {
        // poll once in a million iterations to reduce overhead
        if ((loopCount & 0xf_ffff) == 0) {
            TruffleSafepoint.poll(location);
            LoopNode.reportLoopCount(location, 0x10_0000);
        }
    }
}