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package com.oracle.truffle.js.runtime.builtins;

import java.util.HashMap;
import java.util.Map;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleLanguage.LanguageReference;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.CachedLanguage;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.InvalidArrayIndexException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.nodes.access.ReadElementNode;
import com.oracle.truffle.js.nodes.access.WriteElementNode;
import com.oracle.truffle.js.nodes.interop.ArrayElementInfoNode;
import com.oracle.truffle.js.nodes.interop.ExportValueNode;
import com.oracle.truffle.js.nodes.interop.ImportValueNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.array.ScriptArray;
import com.oracle.truffle.js.runtime.interop.InteropArray;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.Undefined;

@ExportLibrary(InteropLibrary.class)
public class JSArgumentsObject extends JSArrayBase {

    protected JSArgumentsObject(Shape shape, ScriptArray arrayType, Object array, int length) {
        super(shape, arrayType, array, null, length, 0, 0, 0, 0);
    }

    public static final class Unmapped extends JSArgumentsObject {

        protected Unmapped(Shape shape, ScriptArray arrayType, Object array, int length) {
            super(shape, arrayType, array, length);
        }
    }

    public static final class Mapped extends JSArgumentsObject {

        protected Mapped(Shape shape, ScriptArray arrayType, Object array, int length) {
            super(shape, arrayType, array, length);
            this.connectedArgumentCount = length;
        }

        protected int connectedArgumentCount;
        protected Map<Long, Object> disconnectedIndices;

        public int getConnectedArgumentCount() {
            return connectedArgumentCount;
        }

        public Map<Long, Object> getDisconnectedIndices() {
            assert JSAbstractArgumentsArray.hasDisconnectedIndices(this);
            return disconnectedIndices;
        }

        @TruffleBoundary
        public void initDisconnectedIndices() {
            assert JSAbstractArgumentsArray.hasDisconnectedIndices(this);
            this.disconnectedIndices = new HashMap<>();
        }
    }

    @Override
    public final String getClassName() {
        return JSArgumentsArray.CLASS_NAME;
    }

    @ExportMessage
    public final Object getMembers(@SuppressWarnings("unused") boolean includeInternal) {
        // Do not include array indices
        assert JSObject.getJSClass(this) == JSArgumentsArray.INSTANCE;
        return InteropArray.create(filterEnumerableNames(this, JSObject.ownPropertyKeys(this), JSArgumentsArray.INSTANCE));
    }

    @SuppressWarnings("static-method")
    @ExportMessage
    public final boolean hasArrayElements() {
        return true;
    }

    @ExportMessage
    public final long getArraySize() {
        return JSRuntime.toInteger(JSObject.get(this, JSAbstractArray.LENGTH));
    }

    @ExportMessage
    public final Object readArrayElement(long index,
                    @CachedLanguage @SuppressWarnings("unused") LanguageReference<JavaScriptLanguage> languageRef,
                    @Cached(value = "create(languageRef.get().getJSContext())", uncached = "getUncachedRead()") ReadElementNode readNode,
                    @Cached ExportValueNode exportNode,
                    @CachedLibrary("this") InteropLibrary thisLibrary) throws InvalidArrayIndexException, UnsupportedMessageException {
        if (index < 0 || index >= thisLibrary.getArraySize(this)) {
            throw InvalidArrayIndexException.create(index);
        }
        Object result;
        if (readNode == null) {
            result = JSObject.getOrDefault(this, index, this, Undefined.instance);
        } else {
            result = readNode.executeWithTargetAndIndexOrDefault(this, index, Undefined.instance);
        }
        return exportNode.execute(result);
    }

    @ExportMessage
    public final boolean isArrayElementReadable(long index,
                    @CachedLibrary("this") InteropLibrary thisLibrary) {
        try {
            return index >= 0 && index < thisLibrary.getArraySize(this);
        } catch (UnsupportedMessageException e) {
            throw Errors.shouldNotReachHere(e);
        }
    }

    @ExportMessage
    public final void writeArrayElement(long index, Object value,
                    @Shared("elementInfo") @Cached ArrayElementInfoNode elements,
                    @Cached ImportValueNode castValueNode,
                    @CachedLanguage @SuppressWarnings("unused") LanguageReference<JavaScriptLanguage> languageRef,
                    @Cached(value = "createCachedInterop(languageRef)", uncached = "getUncachedWrite()") WriteElementNode writeNode) throws InvalidArrayIndexException, UnsupportedMessageException {
        elements.executeCheck(this, index, ArrayElementInfoNode.WRITABLE);
        Object importedValue = castValueNode.executeWithTarget(value);
        if (writeNode == null) {
            JSObject.set(this, index, importedValue, true, null);
        } else {
            writeNode.executeWithTargetAndIndexAndValue(this, index, importedValue);
        }
    }

    @ExportMessage
    public final boolean isArrayElementModifiable(long index,
                    @Shared("elementInfo") @Cached ArrayElementInfoNode elements) {
        return elements.executeBoolean(this, index, ArrayElementInfoNode.MODIFIABLE);
    }

    @ExportMessage
    public final boolean isArrayElementInsertable(long index,
                    @Shared("elementInfo") @Cached ArrayElementInfoNode elements) {
        return elements.executeBoolean(this, index, ArrayElementInfoNode.INSERTABLE);
    }
}