/*
 * Copyright (C) 2024 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.car.internal.property;

import android.annotation.NonNull;
import android.car.builtin.os.ParcelHelper;
import android.os.Parcel;
import android.os.Parcelable;

import com.android.car.internal.util.DataClass;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Objects;

/**
 * This is a custom parcelable that stores a property's actual value.
 *
 * @param <T> maybe one of the following types:
 * <ul>
 * <li>String for STRING type property.</li>
 * <li>Boolean for BOOLEAN type property.</li>
 * <li>Integer for INT32 type property.</li>
 * <li>Integer[] for INT32_VEC type property.</li>
 * <li>Long for INT64 type property.</li>
 * <li>Long[] for INT64_VEC type property.</li>
 * <li>Float for FLOAT type property.</li>
 * <li>Float[] for FLOAT_VEC.</li>
 * <li>byte[] for BTYES type property.</li>
 * <li>Object[] for MIXED type property.</li>
 * </ul>
 */
@DataClass(genConstructor = false)
public final class RawPropertyValue<T> implements Parcelable {
    private static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
    private static final int TYPE_OTHER = 0;
    private static final int TYPE_STRING = 1;
    private static final int TYPE_BYTE_ARRAY = 2;

    private final @NonNull T mTypedValue;

    public RawPropertyValue(T typedValue) {
        mTypedValue = typedValue;
    }

    /**
     * Creates an instance of {@code RawPropertyValue}.
     *
     * @param in Parcel to read
     */
    @SuppressWarnings("unchecked")
    public RawPropertyValue(Parcel in) {
        int type = in.readInt();
        switch (type) {
            case TYPE_STRING:
                byte[] bytes = ParcelHelper.readBlob(in);
                mTypedValue = (T) new String(bytes, DEFAULT_CHARSET);
                break;
            case TYPE_BYTE_ARRAY:
                mTypedValue = (T) ParcelHelper.readBlob(in);
                break;
            default:
                mTypedValue = (T) in.readValue(getClass().getClassLoader());
        }
    }

    public T getTypedValue() {
        return mTypedValue;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        Class<?> valueClass =  mTypedValue.getClass();

        // Special handling for String and byte[] to mitigate transaction buffer limitations.
        if (valueClass == String.class) {
            dest.writeInt(TYPE_STRING);
            ParcelHelper.writeBlob(dest, ((String) mTypedValue).getBytes(DEFAULT_CHARSET));
        } else if (valueClass == byte[].class) {
            dest.writeInt(TYPE_BYTE_ARRAY);
            ParcelHelper.writeBlob(dest, (byte[]) mTypedValue);
        } else {
            dest.writeInt(TYPE_OTHER);
            dest.writeValue(mTypedValue);
        }
    }

    @Override
    public boolean equals(@android.annotation.Nullable Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        @SuppressWarnings("unchecked")
        RawPropertyValue<?> that = (RawPropertyValue<?>) o;
        return Objects.deepEquals(mTypedValue, that.mTypedValue);
    }

    @Override
    public int hashCode() {
        return Arrays.deepHashCode(new Object[]{mTypedValue});
    }

    @Override
    public String toString() {
        String typedValueString = "";
        Class<?> valueClass =  mTypedValue.getClass();
        if (valueClass == Integer[].class) {
            typedValueString = Arrays.toString((Integer[]) mTypedValue);
        } else if (valueClass == Long[].class) {
            typedValueString = Arrays.toString((Long[]) mTypedValue);
        } else if (valueClass == Float[].class) {
            typedValueString = Arrays.toString((Float[]) mTypedValue);
        } else if (valueClass == byte[].class) {
            typedValueString = Arrays.toString((byte[]) mTypedValue);
        } else if (valueClass == Object[].class) {
            typedValueString = Arrays.toString((Object[]) mTypedValue);
        } else {
            typedValueString = mTypedValue.toString();
        }
        return "RawPropertyValue{typedValue=" + typedValueString + "}";
    }


    // Code below generated by codegen v1.0.23.
    //
    // DO NOT MODIFY!
    // CHECKSTYLE:OFF Generated code
    //
    // To regenerate run:
    // $ codegen $ANDROID_BUILD_TOP/packages/services/Car/car-lib/src/com/android/car/internal/property/RawPropertyValue.java
    //
    // To exclude the generated code from IntelliJ auto-formatting enable (one-time):
    //   Settings > Editor > Code Style > Formatter Control
    //@formatter:off

    @Override
    @DataClass.Generated.Member
    public int describeContents() { return 0; }

    @DataClass.Generated.Member
    public static final @NonNull Parcelable.Creator<RawPropertyValue> CREATOR
            = new Parcelable.Creator<RawPropertyValue>() {
        @Override
        public RawPropertyValue[] newArray(int size) {
            return new RawPropertyValue[size];
        }

        @Override
        public RawPropertyValue createFromParcel(@NonNull Parcel in) {
            return new RawPropertyValue(in);
        }
    };

    @DataClass.Generated(
            time = 1728329458051L,
            codegenVersion = "1.0.23",
            sourceFile = "packages/services/Car/car-lib/src/com/android/car/internal/property/RawPropertyValue.java",
            inputSignatures = "private static final  java.nio.charset.Charset DEFAULT_CHARSET\nprivate final @android.annotation.NonNull com.android.car.internal.property.T mTypedValue\npublic  com.android.car.internal.property.T getTypedValue()\npublic @java.lang.Override void writeToParcel(android.os.Parcel,int)\npublic @java.lang.Override boolean equals(java.lang.Object)\npublic @java.lang.Override int hashCode()\nclass RawPropertyValue extends java.lang.Object implements [android.os.Parcelable]\n@com.android.car.internal.util.DataClass(genConstructor=false, genToString=true)")
    @Deprecated
    private void __metadata() {}


    //@formatter:on
    // End of generated code

}